2G to 3G reselection

GSM BSS

Interoperability Between GSM and WCDMAFeature Parameter Description

Copyright © Huawei Technologies Co., Ltd. 2012. All rights reserved.

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Contents1 Introduction

1.1 Scope

1.2 Intended Audience

1.3 Change History

2 Overview

3 Iur-g Interface Between GSM and WCDMA 3.1 Introduction to the Iur-g Interface

3.2 Common Measurement

3.3 Information Exchange

4 Measurement of Neighboring WCDMA Cells

5 GSM / WCDMA Inter-RAT Cell Reselection 5.1 Cell Reselection from WCDMA to GSM

5.1.1 Cell Reselection from WCDMA to GSM for MSs in Idle Mode

5.1.2 WCDMA - to - GSM NACC

5.2 Cell Reselection from GSM to WCDMA

5.2.1 Cell Reselection Based on Cell Ranking

5.2.2 Fast WCDMA Reselection at 2G CS Call Release

5.2.3 NC2 between GSM and WCDMA

6 GSM / WCDMA Inter-RAT CS Handover 6.1 CS Handover from WCDMA to GSM

6.2 CS Handover from GSM to WCDMA

6.2.1 Overview

6.3 Service-Based CS Handover from GSM to WCDMA

6.3.1 Overview

6.3.2 Procedure

6.4 Load-Based CS Handover from GSM to WCDMA

6.4.1 Overview

6.4.2 Procedure

7 GSM / WCDMA Inter-RAT PS Handover 7.1 WCDMA - to - GSM PS Handover

7.1.1 Overview

7.1.2 Procedure

7.2 GSM - to - WCDMA PS Handover

7.2.1 Overview

7.2.2 Procedure

8 Related Features

9 Impact on the Network9.1 GSM / WCDMA Interoperability

9.1.1 Impact on System Capacity

9.1.2 Impact on Network Performance

9.2 GSM / WCDMA Service Based Handover



9.3 GSM / WCDMA Load Based Handover



9.4 2G/3G Cell Reselection Based on MS State



9.5 Fast WCDMA Reselection at 2G CS Call Release



10 Engineering Guidelines10.1 When to Use Interoperability Between GSM and WCDMA

10.1.1 GSM / WCDMA Interoperability

10.1.2 GSM / WCDMA Service Based Handover

10.1.3 GSM / WCDMA Load Based Handover

10.1.4 2G/3G Cell Reselection Based on MS State


10.2 Information to Be Collected






10.3 Network Planning






10.4 Overall Deployment Procedure

10.5 Deploying GSM / WCDMA Interoperability

10.6 Deploying 2G/3G Cell Reselection Based on MS State

10.7 Deploying GSM / WCDMA Service Based Handover

10.8 Deploying GSM / WCDMA Load Based Handover

10.9 Deploying Fast WCDMA Reselection at 2G CS Call Release

10.10 Related Parameters in the System Information

10.11 Neighboring WCDMA Cell Configuration

10.12 Iur-g Interface Between GSM and WCDMA

10.13 GSM / WCDMA Inter-RAT NC2 and GSM / WCDMA Inter-RAT PS Handover

10.14 Performance Optimization

10.14.1 GSM / WCDMA Interoperability and 2G/3G Cell Reselection Based on MS State

10.14.2 GSM / WCDMA Service Based Handover and GSM / WCDMA Load Based Handover


10.15 Troubleshooting

11 Parameters

12 Counters

13 Glossary

14 Reference Documents

1 Introduction

1.1 ScopeThis document describes the Interoperability Between GSM and WCDMA feature, including its technical description, feature dependencies, network impact, and engineering guidelines. The technical description includes measurement of neighboring WCDMA cells, GSM/WCDMA inter-RAT cell reselection, and GSM/WCDMA inter-RAT CS/PS handover.

The Interoperability Between GSM and WCDMA feature involves the following features:

GBFD-114301 GSM/WCDMA Interoperability

GBFD-114321 GSM/WCDMA Service Based Handover

GBFD-114322 GSM/WCDMA Load Based Handover

GBFD-114323 2G/3G Cell Reselection Based on MS State

GBFD-114325 Fast WCDMA Reselection at 2G CS Call Release

GBFD-511101 Load Based Handover Enhancement on Iur-g

GBFD-511102 NACC Procedure Optimization Based on Iur-g

GBFD-511103 GSM and WCDMA Load Balancing Based on Iur-g

GBFD-511104 GSM and WCDMA Traffic Steering Based on Iur-g

GBFD-119502 PS Handover

GBFD-116201 Network-Controlled Cell Reselection (NC2)

The following features are described in this document:

GBFD-114301 GSM/WCDMA Interoperability

GBFD-114321 GSM/WCDMA Service Based Handover

GBFD-114322 GSM/WCDMA Load Based Handover

GBFD-114323 2G/3G Cell Reselection Based on MS State

GBFD-114325 Fast WCDMA Reselection at 2G CS Call Release

GBFD-119502 PS Handover

GBFD-116201 Network-Controlled Cell Reselection (NC2)

The following features are described in the Common Radio Resource Management Feature Parameter Description:

GBFD-511101 Load Based Handover Enhancement on Iur-g

GBFD-511102 NACC Procedure Optimization Based on Iur-g

GBFD-511103 GSM and WCDMA Load Balancing Based on Iur-g

GBFD-511104 GSM and WCDMA Traffic Steering Based on Iur-g

1.2 Intended AudienceThis document is intended for:

Personnel who need to understand the Interoperability Between GSM and WCDMA feature

Personnel who work with Huawei GSM products

1.3 Change HistoryThis section provides information about the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change: refers to a change in the Interoperability Between GSM and WCDMA feature of a specific product version.

Editorial change: refers to a change in wording or the addition of information that was not described in the earlier version.

Document Issues

The document issue is as follows:

02 (2012-06-30)

01 (2011-03-31)

Draft A (2011-01-15)

02(2012-06-30)

This is the second release of GBSS13.0.

Compared with issue 01 (2011-03-31) of GBSS13.0, issue 02 (2012-06-30) of GBSS13.0 incorporates the changes described in the following table.

Change Type Change Description Parameter Change

Feature change None None

Editorial change Added the following chapters:

Chapter 8 Related Features

Chapter 9 Impact on the Network

Chapter 10 Engineering Guidelines

Deleted descriptions about cell reselection based on cell priority.

None

01(2011-03-31)

This is the first release of GBSS13.0.

Compared with issue Draft A (2011-01-15) of GBSS13.0, issue 01 (2011-03-31) of GBSS13.0 has no change.

Draft A (2011-01-15)

This is the draft release of GBSS13.0.

Compared with issue 01 (2010-06-30) of GBSS12.0, draft A (2011-01-15) of GBSS13.0 incorporates the changes described in the following table.

Change Type Change Description Parameter Change

Feature change Added a description of the PS handover between GSM andWCDMA.

Added a description of the NC2 between GSM and WCDMA.

The added parameters are listed as follows:

SPTINTERRATINBSCPSHO

SPTINTERRATOUTBSCPSHO

PFCSUP

NACCSPT

NCO

FDDFREQCNUM

FDDCELLOFF

FDDCELLTHRED

TrafficReselAllow

Editorial change The following contents are optimized:

GSM-to-WCDMA cell reselection.

GSM-to-WCDMA CS handover.

Setting of GSM and WCDMAconfiguration parameters.

None

2 OverviewWCDMA and GSM will coexist for a long time. Therefore, Huawei GSM BSS provides GSM/WCDMA interoperability, which allows inter-RAT handovers and inter-RAT cell reselections between GSM and WCDMA.

GSM/WCDMA interoperability supports smooth evolution from GSM to WCDMA, which helps reduce operators' capital expenditure (CAPEX). This feature provides operators with both WCDMA and GSM networks complete support for a seamless coverage from GSM to WCDMA. For example, with the cell reselection or handover function, operators can keep providing services for a dual-mode MS that moves away from the WCDMA coverage, thereby improving user experience.

In areas covered by both GSM and WCDMA networks, Interoperability between GSM and WCDMA balances traffic loads between two networks. For example, when the traffic load in a GSM cell is too high, Interoperability between GSM and WCDMA can hand over some calls in the GSM cell to a WCDMA cell.

Interoperability between GSM and WCDMA also allows operators to set different service access policies in areas covered by both GSM and WCDMA networks. For example,GSM is preferentially selected for handling CS services and WCDMA for PS services.

All MSs mentioned in this document are multi-mode MSs that support both GSM and WCDMA.

3 Iur-g Interface Between GSM and WCDMA3.1 Introduction to the Iur-g InterfaceLoad information exchange is a prerequisite for the Interoperability Between GSM and WCDMA feature. Load information exchange consists of the following types:

Load information exchange through the core network (CN): Load information, which is carried in the information elements (IEs) in the signaling for handovers, is exchanged between the GSM BSC over the A interface and the WCDMA RNC over the Iu interface. In this situation, load information exchanges irregularly. Therefore, unnecessary handover attempts may occur.

Load information exchange through the Iur-g interface: Load information is exchanged between the GSM BSC and the WCDMA RNC through the Iur-g interface instead of the CN. Through the Iur-g interface, the GSM BSC and WCDMA RNC can exchange load information with each other by performing information exchange and common measurement. This simplifies the GSM/WCDMA interoperability procedure, shortens the handover delay, and increases the handover success rate.

Figure 3-1 shows the position of the Iur-g interface on a network.

Figure 3-1 Position of the Iur-g interface on a network

Figure 3-2 shows the protocol stack defined in 3GPP specifications for the Iur-g interface.

Figure 3-2 Protocol stack defined in 3GPP specifications for the Iur-g interface

The Iur-g interface has a control plane and does not have a user plane. The Iur-g interface uses IP transmission.

There is an Iur-g interface instance between each remote RNC and a local BSC. The Iur-g interface supports common measurement and information exchange procedures. These two procedures are performed through connection-oriented signaling.

3.2 Common MeasurementCommon measurement is based on the Iur-g interface. The procedures of common measurement are performed through connection-oriented signaling.

Common measurement is enabled if SPTCOMMMEAS is set to Yes.

Common measurement involves the following procedures:

1. Common measurement initialization

The source BSC/RNC sends a COMMON MEASUREMENT INITIATION REQUEST message to the target RNC/BSC to initialize the common measurement initialization procedure, requesting the target RNC/BSC to periodically report the load information about its neighboring cells.

If the target RNC/BSC supports common measurement, it responds with a COMMON MEASUREMENT INITIATION RESPOSE message, as shown in Figure 3-3.

Figure 3-3 Successful common measurement initialization

If the target RNC/BSC does not support common measurement or rejects the common measurement request, it responds with a COMMON MEASUREMENT INITIATION FAILURE message, as shown in Figure 3-4.

Figure 3-4 Failed common measurement initialization

2. Periodic common measurement reporting

After a common measurement is successfully initialized, the target RNC/BSC periodically sends COMMON MEASUREMENT REPORT messages to the source BSC/RNC toreport the load information about neighboring cells, as shown in Figure 3-5.

Figure 3-5 Common measurement reporting procedure

If a neighboring cell is faulty, blocked, removed, or deactivated, the target RNC/BSC sends a COMMON MEASUREMENT FAILURE INDICATION message to the source BSC/RNC, notifying the source BSC/RNC that the common measurement procedure has failed and must be terminated, as shown in Figure 3-6.

Figure 3-6 Failed common measurement

3.3 Information ExchangeDuring a common measurement procedure, the Iur-g interface carries the load information about GSM and WCDMA cells, the inter-RAT CS service handover support flags of GSM cells, and the inter-RAT PS service handover support flags of GSM cells. This section uses load information about GSM cells as an example. The information exchange is enabled if SPTINFOEXCHG is set to Yes and INFOEXCHGLIST is set to CELLCAPCLASS.

The load state of a cell can be normal, basic congestion, or overload congestion.

Table 3-1 describes the rules for determining the load states of GSM cells.

Table 3-1 Rules for determining the load states of GSM cells

Uplink/Downlink If... Then the Load State of the Cell Is…

Uplink Uplink load < UlLdrThrd2GCell Normal

UlLdrThrd2GCell ≤ Uplink load <UlOlcThrd2GCell

Basic congestion

Uplink load ≥ UlOlcThrd2GCell Overload congestion

Downlink Downlink load < DlLdrThrd2GCell Normal

DlLdrThrd2GCell ≤ Downlink load <DlOlcThrd2GCell

Basic congestion

Downlink load ≥ DlOlcThrd2GCell Overload congestion

Inter-RAT CS service handover support flag of a GSM cell

When the TCH usage of the cell is greater than or equal to InterRatCsServiceLoadHoThrd or INTERRATINBSCHOEN is set to NO, this flag is set to NO, which meansWCDMA-GSM CS service handover is not allowed.

When INTERRATINBSCHOEN is set to YES and the TCH usage of the cell is less than InterRatCsServiceLoadHoThrd, this flag is set to YES, which meansWCDMA-GSM CS service handover is allowed.

Inter-RAT PS service handover support flag of a GSM cell

When the TBF multiplexing rate of a GSM cell is less than LOADRESELRXTHRSH, this flag is set to YES, which means WCDMA-GSM PS service handover is allowed. When the TBF multiplexing rate of a GSM cell is greater than or equal to LOADRESELRXTHRSH, this flag is set to NO, which means WCDMA-GSM PS service handover is not allowed.

4 Measurement of Neighboring WCDMA CellsTo support cell reselection and handover from GSM to WCDMA, the BSS sends the neighboring WCDMA cell list and parameters for cell reselection and handover through system information (SI) to MSs. MSs then measure neighboring WCDMA cells based on the received information. SI consists of SI2quater and Measurement Information. SI2quater is sent on the BCCH, and Measurement Information is sent on the SACCH. The Send2QuterFlag parameter specifies whether to send SI2quater.

MSs in GSM cells measure both the signal level of neighboring GSM cells and the signal quality of neighboring WCDMA cells. The BSS controls the neighboring cell measurement to avoid unnecessary measurements and reduce the power consumption of MSs. MSs in idle mode or packet transfer mode can perform inter-RAT cell reselection. MSs in dedicated mode can perform inter-RAT handover. Operators can set different measurement parameters for MSs operating in different modes.

When an MS is in idle mode, it determines whether to measure information about neighboring WCDMA cells based on the value of QI and the receive level of the serving cell. The conditions for triggering measurement depend on the value of QI.

If QI is set to a value within the range of 0 to 6, the measurement is triggered when the receive level of the serving cell is lower than QI.

If QI is set to a value within the range of 8 to 14, the measurement is triggered when the receive level of the serving cell is higher than QI.

If QI is set to 7, MSs always measure neighboring WCDMA cell information.

If QI is set to 15, MSs do not measure neighboring WCDMA cell information.

Normally, MSs in packet transfer mode determine whether to measure the information about neighboring WCDMA cells according to the value of QI and the receive level ofthe serving cell. If any of the following conditions are met, MSs in packet transfer mode determine whether to measure neighboring WCDMA cell information based on the value of QP and the receive level of the serving cell.

The GSM cell has a PBCCH, and QP is broadcast on the PBCCH.

The serving GSM cell does not have a PBCCH but QP is broadcast on the BCCH. In addition, MSs have received the Packet Cell Change Order message or the Packet Measurement Order message that carries the GPRS cell reselection parameters of one or more WCDMA cells.

The conditions for triggering measurement depend on the value of QP.

If QP is set to a value within the range of 0 to 6, the measurement is triggered when the receive level of the serving cell is lower than the value of QP.

If QP is set to a value within the range of 8 to 14, the measurement is triggered when the receive level of the serving cell is higher than the value of QP.

If QP is set to 7, MSs always measure neighboring WCDMA cell information.

If QP is set to 15, MSs do not measure neighboring WCDMA cell information.

When an MS is in dedicated mode, it determines whether to measure the information about neighboring WCDMA cells based on QSEARCHC and the receive level of the serving cell. The conditions for triggering the measurement depend on the value of QSEARCHC.

If QSEARCHC is set to a value within the range of 0 to 6, the measurement is triggered when the receive level of the serving cell is lower than QSEARCHC.

If QSEARCHC is set to a value within the range of 8 to 14, the measurement is triggered when the receive level of the serving cell is higher than QSEARCHC.

If QSEARCHC is set to 7, MSs always measure neighboring WCDMA cell information.

If QSEARCHC is set to 15, MSs do not measure neighboring WCDMA cell information.

QSEARCHC is contained in the Measurement Information message. After entering dedicated mode, MSs attempt to obtain QSEARCHC from the Measurement Information message transmitted on the SACCH. Before QSEARCHC is obtained, MSs use the value of QCI that is transmitted on the BCCH as the value of QSEARCHC.

5 GSM/WCDMA Inter-RAT Cell ReselectionGSM/WCDMA inter-RAT cell reselection includes WCDMA-to-GSM cell reselection and GSM-to-WCDMA cell reselection. Cell reselection is mainly performed by MSs.

For MSs in idle mode, GSM/WCDMA interoperability involves only GSM/WCDMA inter-RAT cell reselection. A dual-mode or multi-mode MS camping on a GSM cell measures the information about neighboring WCDMA cells, and then decides whether to reselect the WCDMA cell based on cell reselection parameters.

For MSs in packet transfer mode, cell reselection modes include network-controlled mode 0 (NC0), network-controlled mode 1 (NC1), and network-controlled mode 2 (NC2). MSs can reselect a WCDMA cell for PS services. NC0 cell reselection and NC1 cell reselection are performed by MSs without the intervention of the BSS. In NC2 cell reselection, the BSS sends signaling to steer MSs towards desired camping cells.

The INTERRATCELLRESELEN parameter specifies whether to enable GSM/WCDMA inter-RAT cell reselection. When INTERRATCELLRESELEN is set to NO(No), the BSS does not send the neighboring WCDMA cell list and the parameters related to GSM/WCDMA inter-RAT cell reselection. In this case, MSs in a GSM cell cannot reselect aWCDMA cell.

5.1 Cell Reselection from WCDMA to GSMCell reselection from WCDMA to GSM involves the cell reselection for MSs in idle and packet transfer modes. In addition, cell reselection for MSs in packet transfer mode isWCDMA-to-GSM NACC or enhanced WCDMA-to-GSM NACC.

5.1.1 Cell Reselection from WCDMA to GSM for MSs in Idle Mode

When an MS moves to the GSM coverage area and reselects a GSM cell, the MS initiates a location update to the GSM network if the location area is changed. The GSMnetwork handles the location update regardless of whether the MS is from a WCDMA cell.

In the BSS, the cell reselection procedure from WCDMA to GSM is the same as that between GSM cells. Therefore, this procedure is not described in this document. For details, see the Idle Mode Behavior Feature Parameter Description.

5.1.2 WCDMA-to-GSM NACC

The WCDMA-to-GSM NACC procedure is specified in 3GPP specifications. The GSM-to-WCDMA NACC procedure, however, is not.

Figure 5-1 shows the WCDMA-to-GSM NACC procedure.

Figure 5-1 WCDMA-to-GSM NACC procedure

After the RNC determines that an MS should reselect a GSM cell, it sends a Cell Change Order From UTRAN message to the MS. If the WCDMA-to-GSM NACC procedure is applied, the Cell Change Order From UTRAN message carries the IE "Geran System Information" that contains the SI1, SI3, and SI13 of the target GSM cell.

Before performing WCDMA-to-GSM NACC, the RNC obtains the SI of the target GSM cell through the RAN Information Management (RIM) procedure. The RIM procedure consists of SI request and SI update procedures.

SI request procedure: This procedure is initiated by the source RNC, requesting the SI about the target GSM cell.

SI update procedure: This procedure is initiated by the target BSC, instructing the source RNC to update the SI about the target GSM cell.

After receiving the Cell Change Order From UTRAN message, the MS leaves the WCDMA cell and reselects the GSM cell. After the cell reselection is complete, the MS uses the SI about the target GSM cell in the initial packet access procedure. In this manner, the period of packet service disruption is shortened.

During the WCDMA-to-GSM NACC procedure, the RIM procedure must be supported on the Gb interface. To support the RIM procedure, the BSC must be configured with the RIMSUP parameter for the NSE to indicate whether the RIM procedure is supported.

5.2 Cell Reselection from GSM to WCDMACell reselection from GSM to WCDMA includes cell reselection based on cell ranking and cell reselection for MSs in packet transfer modes. Cell reselection for MSs in packet transfer mode is classified into Fast 3G Reselection at 2G CS Call Release and NC2 between GSM and WCDMA. Fast 3G Reselection at 2G CS Call Release and NC2 between GSM and WCDMA are optimized cell reselection solutions, which can accelerate cell reselection.

5.2.1 Cell Reselection Based on Cell Ranking

MSs in a GSM cell obtain the neighboring WCDMA cell list and cell reselection parameters from SI2quater, and then measure neighboring WCDMA cells according to the list and parameters. The mechanism for NC0 or NC1 cell reselection from GSM to WCDMA for MSs in idle mode is the same

as that for MSs in packet transfer mode. In the GSMnetwork, cell reselection from GSM to WCDMA is controlled by QI, FDDQOFF, and FDDQMIN.

QI is the start level for measuring neighboring WCDMA cells. In the NC0 or NC1 cell reselection for MSs in idle or packet transfer mode, MSs start to search for neighboringWCDMA cells when the level of the serving cell is lower than the value of QI (when QI is set to a value within the range of 0 to 6) or higher than the value of QI (when QI is set to a value within the range of 8 to 14). When QI is set to 7, MSs always search for neighboring WCDMA cells.

Ec/No and Received Signal Code Power (RSCP) of the Common Pilot Channel (CPICH) are commonly used during neighboring WCDMA cell measurement. An MS startsGSM-to-WCDMA cell reselections if the following conditions are met and last for more than five seconds:

CPICH RSCP > RLA_C + FDDQOFF

CPICH Ec/No ≥ FDDQMIN - FDDQMINOFFSET

CPICH RSCP ≥ FDD_RSCP_threshold

In WCDMA, Ec/No is the ratio of energy per modulating bit to the noise spectral density. It is equivalent to C/I in GSM.

Where,

RLA_C is the average receive level. In a GSM-to-WCDMA cell reselection, the RSCP of the neighboring WCDMA cell must meet the following requirements:

− RSCP > Average receive level of the serving cell + FDDQOFF

− RSCP > Receive level of each neighboring GSM cell + FDDQOFF

FDDQOFF is the receive level difference between the candidate WCDMA cell and the serving GSM cell. This parameter is a key factor for controlling the GSM-to-WCDMA cell reselection. The greater the value of FDDQOFF is, the more difficult it is for the GSM-to-WCDMA cell reselection condition to be met, and more MSs will camp on theGSM cell.

FDDQMIN is the minimum Ec/No threshold for GSM-to-WCDMA cell reselection. The greater the value of FDDQMIN is, the more difficult it is to meet the cell reselection condition. FDDQMINOFFSET is offset of the minimum Ec/No threshold for GSM-to-WCDMA cell reselection. An MS determines the minimum receive level of a candidateWCDMA cell for cell reselection based on FDDQMIN and FDDQMINOFFSET. That is, FDDQMIN and FDDQMINOFFSET do not determine the cell reselection from GSM toWCDMA directly but guarantee the signal quality of the candidate WCDMA cell.

FDD_RSCP_threshold is calculated as follows:

− If FDD_RSCPmin is broadcast in the serving cell, then FDD_RSCP_threshold = FDDRSCPMIN - min((P_MAX - 21 dBm), 3 dB).

− If FDD_RSCPmin is not broadcast in the serving cell and Qrxlevmin and Pcompensation can be obtained in the serving cell, then FDD_RSCP_threshold = Qrxlevmin + Pcompensation + 10 dB

− If FDD_RSCPmin is not broadcast in the serving cell and Qrxlevmin and Pcompensation cannot be obtained in the serving cell, then FDD_RSCP_threshold = -102dBm (the default value of FDD_RSCPmin).

Where,

− P_MAX is the maximum RF output power of an MS in a WCDMA cell.

− Qrxlevmin is the minimum required RX level in a WCDMA cell.

− Pcompensation is max(UE_TXPWR_MAX_RACH – P_MAX, 0).

− UE_TXPWR_MAX_RACH is the maximum TX power level an MS may use when accessing a WCDMA cell on RACH.

− FDDRSCPMIN is used to calculate the FDD_RSCP_threshold of the target cell for a GSM-to-WCDMA cell reselection.

If multiple WCDMA cells meet the cell reselection conditions, the MS selects the cell with the highest RSCP as the target cell.

The GSM-to-WCDMA cell reselection cannot be triggered within five seconds after the WCDMA-to-GSM cell reselection. In case of a cell reselection occurring within the previous 15 seconds, FDDQOFF is increased by 5 dB.

If both the conditions for the GSM-to-WCDMA cell reselection and those for the GSM-to-GSM cell reselection are met, the MS selects a WCDMA cell as the target cell.


This section describes the feature GBFD-114325 Fast WCDMA Reselection at 2G CS Call Release

Overview

When an MS terminates a call in the GSM network, it camps on the cell in which the call is released and then starts neighboring cell measurement. When a neighboringWCDMA cell meets the requirements for cell reselection, the MS reselects the WCDMA cell. The WCDMA cell reselection is initiated after the MS receives the SI and performs the related calculation.

When the feature Fast WCDMA Reselection at 2G CS Call Release is activated, the BSS selects the best neighboring WCDMA cell based on the measurement information after the MS in a GSM cell terminates a CS call. Then, the BSS sends the MS the cell information through the Channel Release message, instructing the MS to camp on thatWCDMA cell. With this feature, an MS can camp on a WCDMA cell without performing cell reselection decisions, accelerating cell reselection. This feature allows the MS tocamp on the WCDMA cell for a longer period. In addition, the number of location area updates is reduced, and the paging success rate is increased, increasing the revenue of operators in the WCDMA network.

The WCDMA network in this document refers to the UTRAN FDD. FDD stands for frequency division duplex (FDD).

Procedure

After an MS in a GSM cell releases a CS call, the BSC sends the MS a Channel Release message that carries the IE "Cell selection indicator after release of all TCH and SDCCH". This IE carries the neighboring WCDMA cell information, facilitating the MS to reselect a WCDMA cell. This feature needs the support of both the network and the MS.

Figure 5-2 shows the cell reselection procedure for an MS-terminated call.

Figure 5-2 Procedure for fast WCDMA reselection at 2G CS call release

1. After receiving a Release Complete message from the MS, the MSC sends a Clear Command message to the BSC, instructing the BSC to release the occupied resources on the A and Um interfaces.

2. The BSC sends a Channel Release message to the MS, instructing the MS to release the TCH or SDCCH on the Um interface. The Channel Release message may carry the IE "Cell selection indicator after release of all TCH and SDCCH", which contains the information about the target neighboring WCDMA cell.

The MS in the serving GSM cell measures neighboring cells.

If... Then...

The information about neighboring WCDMAcells is carried in a measurement report (MR)

The BSC carries the information (including FDD-ARFCN and FDD_CELL_INFORMATION) about the best neighboring WCDMA cell in the Channel Release message, instructing the MS to reselect that neighboring WCDMA cell.

No neighboring WCDMA cell information is carried in an MR or the value ofCELLSELECTAFTERCALLREL is NO(No)

The BSC does not carry the IE "Cell selection indicator after release of all TCH and SDCCH" in the Channel Release message.

3. After receiving the Channel Release message, the MS releases the main signaling link. Then, the MS sends a DISC frame to the BTS, instructing the BTS to release the TCH or SDCCH.

4. After receiving an Unnumbered Acknowledgement message, the MS switches to idle mode and initiates cell reselection based on the IE "Cell selection indicator after release of all TCH and SDCCH".

If... Then...

The Channel Release message contains the IE "Cell selection indicator after release of all TCH and SDCCH"

The MS attempts to camp on the cell indicated in the Channel Release message.

The Channel Release message does not contain the IE "Cell selection indicator after release of all TCH and SDCCH"

The MS attempts to camp on the cell where the TCH or SDCCH is already released.

5. If step 4 fails, the MS performs a normal cell reselection procedure to camp on any appropriate cells.

5.2.3 NC2 between GSM and WCDMA

This section describes the feature GBFD-116201 NC2 between GSM and WCDMA.

NC2 cell reselection can be performed for inter-RAT cell reselection only when an MS is in packet transfer mode.

NC2 cell reselection between GSM and WCDMA refers to the network-controlled cell reselection from GSM to WCDMA triggered by a BSC.

NC2 cell reselection is activated after the NCO parameter is set to NC2(NC2).

In NC2 cell reselection mode, an MS generally determines whether to measure neighboring WCDMA cells based on the value of QI and the receive level of the serving cell. If any of the following conditions are met, the MS determines whether to measure neighboring WCDMA cells based on the value of QP and the receive level of the serving cell:

The serving GSM cell has a PBCCH, and QP is broadcast on the PBCCH.

The serving GSM cell does not have a PBCCH but QP is broadcast on the BCCH. In addition, MSs have received the Packet Cell Change Order message or the Packet Measurement Order message that carries the GPRS cell reselection parameters of one or more WCDMA cells.

In NC2 cell reselection mode, an MS performs inter-RAT neighboring WCDMA cell measurements based on QP, FDDFREQCNUM, FDDCELLOFF, and FDDCELLTHRED and sends MRs.

QP is the threshold for an MS in PS mode to search for WCDMA cells. If the level of the serving GSM cell is lower than the value of QP (when QP is within the range of 0 to6) or higher than the value of QP (when QP is within the range of 8 to 14), the MS starts to search for WCDMA cells.

FDDFREQCNUM is the number of WCDMA cells that should be contained in the best cell list, which is carried in the MR from an MS.

FDDCELLOFF is the receive level offset for WCDMA cells. During the ranking of measured neighboring cells, the value of this parameter is added to the receive level of measured WCDMA cells.

FDDCELLTHRED is the threshold for reporting a WCDMA cell. The MS reports only the cells whose RSCP is greater than this threshold.

Figure 5-3 shows the procedure for NC2 cell reselection between GSM and WCDMA.

Figure 5-3 Procedure for NC2 cell reselection between GSM and WCDMA

1. An MS in the GPRS Mobility Management (GMM) Ready state periodically sends Packet Measurement Report messages or Packet Enhanced Measurement Report messages to the BSC. These MRs contain the RSCP of neighboring WCDMA cells.

2. After receiving a packet MR, the BSC processes the measurement results. Then, the BSC determines whether to perform a cell reselection.

3. If the BSC determines to initiate a cell reselection, it sends the Packet Cell Change Order message to the MS to instruct the MS to reselect the specified target WCDMAcell. Target cell reselection is based on the NC2 cell reselection algorithm.

4. If a cell reselection fails, the MS sends the Packet Cell Change Failure message to the BSC. After receiving this message, the BSC subtracts PENALTYRXLEV from the receive level of the target cell. If the receive level of the target cell is less than PENALTYRXLEV, the BSC sets the receive level of the target cell to 0.

The NC2 cell reselection algorithms include the service-based NC2 cell reselection algorithm, quality-based NC2 cell reselection algorithm, load-based NC2 cell reselection algorithm.

Service-Based NC2 Cell Reselection Algorithm

The service-based NC2 cell reselection is activated when TrafficReselAllow is set to PERMIT(Permit).

The BSC may find the IE "Service UTRAN CCO" in multiple DL-UNITDATA PDUs, CREATE-BSS-PFC PDUs, or PS-HANDOVER-REQUEST PDUs sent from the SGSN. The BSS considers that the last received IE "Service UTRAN CCO" is of the highest priority. The IE "Service UTRAN CCO" carries Service UTRAN CCO Value part, which indicates the most suitable RAT for the current service.

Table 5-1 lists the values of Service UTRAN CCO Value part and their meanings.

Table 5-1 Values of Service UTRAN CCO Value part and their meanings

Coding Bits Meaning

000 Network initiated cell change order to UTRAN or PS handover to UTRAN procedure should be performed

001 Network initiated cell change order to UTRAN or PS handover to UTRAN procedure should not be performed

010 Network initiated cell change order to UTRAN or PS handover to UTRAN procedure should not be performed

111 If received, should be interpreted as no information available (bits 4-5 valid)

Other values If received, should be interpreted as no information available

If the value of Service UTRAN CCO Value part is 000, the MS triggers a service-based cell reselection and selects the neighboring WCDMA cell with the highest receive level.

If no neighboring WCDMA cell is available, the MS proceeds to perform a quality-based, load-based, or coverage-based NC2 cell reselection.

Quality-Based NC2 Cell Reselection Algorithm

The quality-based NC2 cell reselection is activated when URGENTRESELALLOW is set to PERMIT(Permit).

When the conditions for triggering a service-based NC2 cell reselection are not met, the BSC determines whether to initiate a cell reselection based on the receive quality of the radio link on the Um interface. The MRs or Bit Error Rate (BER) indicates the receive quality on the radio link and the number of times bad radio link quality occurs.

In a receive quality measurement period, if the MS receive quality deterioration ratio is greater than the CELLRXQUALWORSENRATIOTHRSH parameter, a quality-based NC2 cell reselection is initiated.

MS receive quality deterioration ratio = Times of bad radio link quality/Number of radio link quality MRs

In quality-based NC2 cell reselection, the cell with the highest priority is selected as the target cell from candidate GSM cells. The priority of a cell is determined by its receive level and characteristics information such as cell type and support for EDGE. In quality-based NC2 cell reselection, the candidate WCDMA cell with the highest receive level is selected as the target cell. If NC2LoadResel is set to Support(Support), the cell characteristics information also includes the load of the candidate GSMcells under the same BSC.

In quality-based NC2 cell reselection, a candidate cell must meet the following conditions:

Receive level of the neighboring GSM candidate cell > Max(Receive level of the serving cell, MINACCRXLEV) + RESELHYST.

Measured RSCP of the neighboring WCDMA cell > FDDRSCPQUALTHRSH.

When NC2LoadResel is set to Support(Support), the neighboring GSM candidate cells under the same BSC are not congested.

When Service UTRAN CCO Value part is set to 010 or 001, none of the neighboring WCDMA cells is selected as the target cell.

Then, the highest level candidate cell within the highest priority cells is selected as the target cell. If a neighboring WCDMA cell is selected, an NC2 cell reselection fromGSM to WCDMA is triggered.

Load-Based NC2 Cell Reselection Algorithm

The load-based NC2 cell reselection algorithm is activated when LOADRESELALLOW is set to PERMIT(Permit).

When neither the conditions for initiating a service-based NC2 cell reselection nor the conditions for initiating a quality-based NC2 cell reselection are met, a load-based NC2 cell reselection is initiated to balance the load among the cells in the network. In load-based NC2 cell reselection, some MSs in cells with heavy load are reselected tocells with light load. In addition, the MSs in neighboring cells should not be reselected to these heavily-loaded cells.

Figure 5-4 shows a load-based NC2 cell reselection.

Figure 5-4 Load-based NC2 cell reselection

When the serving cell is overloaded and the receive level in this cell is lower than LOADRESELMAXRXLEV, load-based NC2 cell reselection is triggered.

If the channel multiplexing rate of a cell is higher than LOADRESELSTARTTHRSH, the cell load is heavy. Then, the load-based NC2 cell reselection should be enabled.

In a load-based NC2 cell reselection, only the MS whose signal level is lower than LOADRESELMAXRXLEV can be reselected to a neighboring cell.

In load-based NC2 cell reselection, the cell with the highest priority is selected as the target cell from the candidate GSM cells. The priority of a cell is determined by its receive level and characteristics information such as cell type and support for EDGE. Alternatively, the candidate WCDMA cell with the highest receive level is selected as the target cell. If NC2LoadResel is set to Support(Support), the characteristics information about a cell also includes the load of GSM candidate cells under the same BSC.

In load-based NC2 cell reselection, a candidate cell must meet the following conditions:

Receive level of the neighboring GSM cell > Max(Receive level of the serving cell, MINACCRXLEV) + RESELHYST.

Measured RSCP of the neighboring WCDMA cell > FDDRSCPQUALTHRSH.

When NC2LoadResel is set to Support(Support), the neighboring GSM candidate cells under the same BSC are not congested.

When Service UTRAN CCO Value part is set to 010 or 001, none of the neighboring WCDMA cells can be selected as the candidate cell.


Coverage-Based NC2 Cell Reselection Algorithm

Coverage-based NC2 cell reselection is activated when NORMALRESELALLOW is set to PERMIT(Permit).

When none of the conditions for initiating a service-based, quality-based, and load-based NC2 cell reselection are met and the P/N criterion for initiating a coverage-based NC2 cell reselection is met, a coverage-based NC2 cell reselection is initiated.

The P/N criterion for initiating a coverage-based NC2 cell reselection is as follows: In the period specified by RESELWATCHPERIOD, the number of times that the receive level of the serving cell is lower than the value of MINACCRXLEV reaches the value of RESELWORSENLEVTHRSH.

In coverage-based NC2 cell reselection, the cell with the highest priority is selected as the target cell from the candidate GSM cells. The priority of a cell is determined by its receive level and characteristics information such as cell type and support for EDGE. Or, the candidate WCDMA cell with the highest receive level is selected as the target cell. If NC2LoadResel is set to Support(Support), the characteristics information about a cell also includes the load of the GSM candidate cells under the same BSC.

In coverage-based NC2 cell reselection, a candidate cell must meet the following conditions:

Receive level of the neighboring GSM candidate cell > Max(Receive level of the serving cell, MINACCRXLEV) + RESELHYST.

Measured RSCP of the neighboring WCDMA candidate cell > FDDRSCPQUALTHRSH.

When NC2LoadResel is set to Support(Support), the neighboring GSM candidate cell under the same BSC are not congested.

When Service UTRAN CCO Value part is set to 010 or 001, none of the neighboring WCDMA cells can be selected as the candidate cell.


6 GSM/WCDMA Inter-RAT CS HandoverGSM/WCDMA interoperability for MSs in dedicated mode involves GSM-to-WCDMA handover and WCDMA-to-GSM handover. Handovers are implemented by MSs and the BSS.

GSM/WCDMA inter-RAT handovers include emergency handovers, better cell handovers, load-based inter-RAT handovers, and service-based inter-RAT handovers.

Emergency handover is triggered when an ongoing call initiated by a multi-mode MS can no longer be processed in its serving cell due to limited network coverage or other factors. For example, when an MS making a call in the GSM cell edge is about to move outside the cell, an emergency handover is triggered to avoid call drops. For details, see the Handover Feature Parameter Description.

Better cell handover is triggered when the signal quality of a neighboring cell is better than that of the serving cell. Better cell handovers help improve service quality and user experience. For example, when the signal quality of a WCDMA cell is better than that of the serving GSM cell, MSs in the serving cell can be handed over to theWCDMA cell to achieve higher voice quality. For details, see the Handover Feature Parameter Description.

Load-based inter-RAT handover is triggered when the traffic load on the serving cell is too high. For a WCDMA-to-GSM load-based handover, if the traffic load on the targetGSM cell is also high, the target cell rejects the handover to avoid ping-pong handovers.

Service-based handover allows an operator to use the MSC to choose a network for MSs. If the MSC indicates that a service-based handover should be performed on a call in a GSM cell, the BSS hands over the call to a WCDMA cell. If the MSC indicates that a call should not be handed over to a WCDMA call, the BSS does not hand over the call to a WCDMA cell when a handover is needed during the call.

6.1 CS Handover from WCDMA to GSMMSs in dedicated mode can be handed over from a WCDMA cell to a GSM cell. The handover decision and handover procedure are controlled by the RNC. The BSS considers the handover from WCDMA to GSM as a general inter-BSC handover.

The handover from WCDMA to GSM is supported when INTERRATINBSCHOEN is set to YES(Yes).

6.2 CS Handover from GSM to WCDMA

6.2.1 Overview

Handover from GSM to WCDMA is supported when INTERRATOUTBSCHOEN is set to YES(Yes).

The BSS determines whether to initiate an inter-RAT handover from GSM to WCDMA. The process is as follows:

1. An MS in dedicated mode obtains the neighboring WCDMA cell list and other information from measurement information.

2. The MS reports the measurement result to the BSS through an MR.

3. After receiving the measurement result, the BSS determines whether to initiate a handover based on the measurement result and the handover algorithm.

Inter-RAT handover from GSM to WCDMA can be classified into emergency handover and better 3G cell handover. The algorithm for emergency handover from GSM toWCDMA is the same as that for general emergency handover. For details, see the Handover Feature Parameter Description.

In the GSM network, the HOOPTSEL parameter specifies whether a GSM cell or a WCDMA cell is preferentially selected as the target cell.

If HOOPTSEL is set to Pre_2G_Cell(Preference for 2G cell), the BSC preferentially selects a GSM cell as the target cell.

If HOOPTSEL is set to Pre_3G_Cell(Preference for 3G cell), the BSC preferentially selects a WCDMA cell as the target cell.

If HOOPTSEL is set to Pre_2G_CellThres(Preference 2G cell by thresh), the BSC determines the target cell according to the receive level of the neighboring GSMcells and the value of HOPRETH2G. If the receive level of all neighboring GSM cells is lower than HOPRETH2G, the BSC selects a WCDMA cell as the target cell.

Better 3G cell handover can be performed only when both INTERRATOUTBSCHOEN and BET3GHOEN are set to YES(Yes). As the measurement result of a WCDMA cell can be reported in the format of RSCP or Ec/No, the methods for handover decision differ accordingly.

When the value of FDDREP is RSCP(RSCP), the better 3G cell handover is triggered if during HOSTAT3G, the following condition is met for the period specified byHODURT3G:

CPICH RSCP > HORSCPTH3G

When the value of FDDREP is EcN0(Ec/N0), the better 3G cell handover is triggered if the following condition is met for the period specified by HODURT3G withinHOSTAT3G:

CPICH Ec/No > HOECNOTH3G

6.3 Service-Based CS Handover from GSM to WCDMAThis section describes the feature GBFD-114321 GSM/WCDMA Load Based Handover.

6.3.1 Overview

Operators can provide more diversified services when GSM and WCDMA coexist in a mixed network. Services of different types can be carried on different networks tooptimize the utilization of resources. For example, voice services and low-rate data services are carried on the GSM network, and high-rate data services are carried on theWCDMA network to allow high peak throughput.

6.3.2 Procedure

If INTERRATOUTBSCHOEN is set to YES(Yes), the BSC applies different handover algorithms for MSs to be handed over from a GSM cell to a WCDMA cell according tothe setting of InterRatServiceLoadHoSwitch.

If InterRatServiceLoadHoSwitch is set to CnService-based(CN Service-based), the BSC processes handovers according to the service handover attributes of the core network (CN) as follows:

− If the service handover indicator of the CN is Handover to UTRAN or cdma2000 should be performed, the MS should be handed over to a WCDMA cell. In this case, the BSC selects a WCDMA cell from the neighboring cell list as the target cell and starts the handover from GSM to WCDMA.

− If the service handover indicator of the CN is Handover to UTRAN or cdma2000 should not be performed, a GSM cell should be preferentially selected as the serving cell. In this case, the BSC does not start the handover from GSM to WCDMA. If a handover is required during the call, a GSM cell is preferentially selected as the target cell.

− If the service handover indicator of the CN is Handover to UTRAN or cdma2000 shall not be performed, the MS must not be handed over to a WCDMA cell. In this case, the BSC will not hand over the MS to a WCDMA cell, and selects only a GSM cell as the target cell if a handover is required.

If InterRatServiceLoadHoSwitch is set to Service-based(Service-based), the BSC removes the WCDMA candidate cell whose uplink/downlink traffic is in the minor congestion level. If the MS is performing a CS service, the MS accesses the current GSM cell.

If InterRatServiceLoadHoSwitch is set to Load-based(Load-based) and the value of the IE "Service Handover" in the ASSIGNMENT REQUEST message sent from the CN is handover to UTRAN or cdma2000 should be performed, the BSC selects a neighboring WCDMA cell whose uplink and downlink loads meet the following condition from WCDMA candidate cells:

G2GLoadAdjustCoeff x Load of the current GSM serving cell – 10 x Load of the neighboring WCDMA cell ≥ 10 x G2G3GLdBlcDeltaThrd – 1000

If multiple neighboring WCDMA cells meet the preceding condition, the BSC starts the directed retry to the WCDMA cell with the highest receive quality. If no neighboringWCDMA cell meets the preceding condition, the BSC selects a GSM cell as the target cell.

If there is no WCDMA candidate cell, or the directed retry to the WCDMA cell fails, the BSC starts the reassignment procedure to a GSM cell.

When InterRatServiceLoadHoSwitch is set to Dynamic-based(Dynamic Service/Load-based):If the current cell has a normal load, the service-based WCDMA-to-GSMhandover algorithm is applied.

If the current cell has a high load, the load-based WCDMA-to-GSM handover algorithm is applied.

6.4 Load-Based CS Handover from GSM to WCDMAThis section describes the feature GBFD-114322 GSM/WCDMA Load Based Handover.

6.4.1 Overview

In a mixed network where GSM and WCDMA coexist, MSs in connected mode can be handed over between GSM and WCDMA to balance the overall network load and enlarge system capacity.

If the GSM cell that the MS camps on is congested, the BSC redirects the MS to the WCDMA network according to the load of the WCDMA network.

6.4.2 Procedure

If both INTERRATOUTBSCHOEN and OutSysLoadHoEn are set to YES(Yes), the following conditions must be met to trigger the handover between GSM and WCDMA for MSs in connected mode:

The flow control level of the current system is smaller than or equal to SYSFLOWLEV.

The load on the serving cell is greater than or equal to TRIGTHRES.

The Service Handover attribute of the service is not handover to UTRAN or cdma2000 shall not be performed.

A candidate WCDMA cell must meet the following conditions:

G2GLoadAdjustCoeff x Load of the current GSM serving cell – 10 x Load of the neighboring WCDMA cell ≥ 10 x G2G3GLdBlcDeltaThrd – 1000

For a WCDMA FDD cell, the following conditions must be met if FDDREP is set to RSCP(RSCP):

− InterRATLoadHoRSCPStart – InterRATLoadHoRSCPBandWidth < CPICH RSCP < InterRATLoadHoRSCPStart

− CPICH RSCP > IntRATLoadHORSCPThr

For a WCDMA FDD cell, the following conditions must be met if FDDREP is set to EcN0(Ec/N0):

− InterRATLoadHoEcNoStart – InterRATLoadHoEcNoBandWidth < CPICH Ec/No < InterRATLoadHoEcNoStart

− CPICH Ec/No > IntRATLoadHOEcNoThr

Cells that do not meet the preceding conditions are removed from the candidate WCDMA cell list. If there are multiple cells in the candidate cell list, the BSC selects the cell with the highest receive level.

7 GSM/WCDMA Inter-RAT PS HandoverThis section describes the feature GBFD-119502 PS Handover Between GSM and WCDMA.

PS handover is introduced in 3GPP Release 6.

This feature involves WCDMA-to-GSM and GSM-to-WCDMA PS handovers.

7.1 WCDMA-to-GSM PS Handover

7.1.1 Overview

WCDMA-to-GSM PS handovers are initiated by the RNC. PS handovers have two phases: handover preparation and handover execution. On the BSS side, the preparation and execution procedures for WCDMA-to-GSM PS handovers are the same as those for inter-BSC handovers in the GSM system.

WCDMA-to-GSM PS handovers are supported when SPTINTERRATINBSCPSHO is set to SUPPORT(Support).

7.1.2 Procedure

This section uses an inter-SGSN WCDMA-to-GSM PS handover as an example. The procedures for the intra-SGSN and inter-SGSN WCDMA-to-GSM PS handovers are similar. The only difference is that during intra-SGSN WCDMA-to-GSM PS handover, there is no inter-SGSN signaling interaction because the GSM cell and the WCDMA cell use the same SGSN.

Figure 7-1 shows the signaling procedure during handover preparation.

Figure 7-1 WCDMA-to-GSM PS handover preparation

1. The RNC makes the decision to perform a handover to a GSM cell.

2. The RNC sends a Relocation Required message to the 3G SGSN, with the IE "Relocation Type" set to UE Involved in relocation of SRNS.

3. The 3G SGSN checks the IE "Target Cell Identifier" and determines that the handover is an inter-RAT handover. Then, the 3G SGSN sends a Forward Relocation Request message to the 2G SGSN of the target cell.

4. The 2G SGSN sends a PS Handover Request message to the BSS, requesting the BSS to reserve resources for the handover. The 2G SGSN then activates the PFC for the handover.

5. The BSS reserves resources and allocates a TBF for the handover based on the PFC.

6. The BSS creates the Target BSS to Source BSS Transparent Container, which contains the PS handover command.

7. The BSS responds to the 2G SGSN with a PS Handover Request Acknowledge message and is then ready to receive downlink data.

8. The 2G SGSN responds with a Forward Relocation Response message. The handover preparation is complete.

Figure 7-2 shows the signaling procedure during handover execution.

Figure 7-2 WCDMA-to-GSM PS handover execution

1. The 3G SGSN receives downlink data from the GGSN and sends the data to the MS through the RNC.

2. The 3G SGSN sends a Relocation Command message to the source RNC.

3. The RNC forwards packet data to the 2G SGSN through the 3G SGSN.

4. The RNC suspends uplink and downlink data transfer, and sends a Handover From UTRAN Command message to the MS. After receiving this message, the MS suspends the uplink data transmission.

5. The RNC sends a Forward SRNS Context (RAB contexts) message to the 2G SGSN through the 3G SGSN. Then, the 2G SGSN responds with a Forward SRNS Context Acknowledge message.

6. The MS executes the handover. In this step, the MS sends access bursts (ABs) to the target BSS and accesses the target GSM cell. Then, the MS receives the timing advance (TA) from the BSS.

7./7a. After accessing the cell, the MS processes the Non-Access Stratum (NAS) container and then sends an exchange identifier (XID) Response message to the 2G SGSNto resume the uplink data transfer.

8. After receiving the first correct RLC/MAC block, the BSS sends a PS Handover Complete message to inform the 2G SGSN that the handover is successful. The 2G SGSN then forwards uplink data to the GGSN.

9. After receiving the PS Handover Complete message, the 2G SGSN sends a Forward Relocation Complete message to inform the 3G SGSN that the handover is complete. The 3G SGSN then responds with a Forward Relocation Complete Acknowledge message.

10. The 2G SGSN sends an Update PDP Context Request message to the GGSN. The GGSN then updates the PDP context fields and returns an Update PDP Context Response message. From now on the GGSN sends new incoming downlink IP packets to the 2G SGSN instead of to the 3G SGSN.

11. The 3G SGSN sends an Iu Release Command message to the RNC to release related resources. After sending all necessary data to the MS, the RNC returns an Iu Release Complete message to the 3G SGSN.

12./12a. The 2G SGSN may initiate LLC/SNDCP XID negotiation.

13. The MS starts the routing area update. The handover is complete.

7.2 GSM-to-WCDMA PS Handover

7.2.1 Overview

The conditions for triggering GSM-to-WCDMA PS handovers are defined in the GSM system, and the handovers are initiated by the BSC. PS handovers have two phases: handover preparation and handover execution.

Prerequisites

The prerequisites for GSM-to-WCDMA PS handover are as follows:

The MS supports PS handover.

The radio access capability reported by the MS contains the PS handover field, which indicates that the MS supports PS handover.

The BSC supports PS handover.

The BSC supports PS handover when PSHOSUP is set to YES(Support), and SPTINTERRATOUTBSCPSHO is set to SUPPORT(Support).

− NACCSPT is set to YES(Yes) if NCO is set to NC0(NC0) or NC1(NC1) because NC0 and NC1 are based on NACC.

− NC2SPT is set to YES(Yes) if NCO is set to NC2(NC2).

The SGSN supports PS handover.

The BVC RESET and BVC RESET ACK messages sent over the Gb interface contain the Extended Feature Bitmap field, which specifies whether the Network Service Entity (NSE) supports PS handover:

− If the BVC RESET or BVC RESET ACK message sent by the SGSN does not contain the Extended Feature Bitmap field, or if the Extended Feature Bitmap field specifies that PS handover is not supported, none of the cells under the NSE of the SGSN support PS handover. That is, the source cell does not support PS handover.

− If the Extended Feature Bitmap field specifies that PS handover is supported, all cells under the NSE of the SGSN support PS handover. That is, the source cell supports PS handover.

The BSC and the SGSN support the PFC procedure.

PFCSUP is set to YES(Support).

Trigger Conditions

The triggering conditions for GSM-to-WCDMA PS handover vary according to the setting of NCO:

When NCO is set to NC0(NC0) or NC1(NC1):

NACCSPT is set to YES(Yes). The MS sends the BSC a PACKET CELL CHANGE NOTIFICATION message, and target cell information contained in the message indicates that the target cell is a WCDMA cell. SPTINTERRATOUTBSCPSHO is set to SUPPORT(Support).

When NCO is set to NC2(NC2):

The MS sends the BSC an MR, and the BSC detects that the target cell is a WCDMA cell that uses the PS handover algorithm. SPTINTERRATOUTBSCPSHO is set toSUPPORT(Support).

Handover Algorithms

GSM-to-WCDMA PS handover algorithms are classified into the service-based handover algorithm, quality-based handover algorithm, load-based handover algorithm, coverage-based handover algorithm. Each handover algorithm has the same triggering conditions and target cell selection mechanism as the corresponding NC2 cell reselection algorithm. For example, the service-based handover algorithm has the same triggering conditions and target cell selection mechanism as the service-based NC2 cell reselection algorithm. For detailed cell reselection algorithms, see section 5.2.3 "NC2 between GSM and WCDMA ."

7.2.2 Procedure

On the BSS side, the GSM-to-WCDMA PS handover procedure is similar to the inter-BSC PS handover procedure. The differences are as follows:

The target cell is a WCDMA cell.

The PS Handover Required message carries the Source BSC to Target RNC Transparent Container, which contains IEs such as the MS radio access capability, paging mode, Global TFI, and target cell SI request.

The PS Handover Required Acknowledge message carries the Source RNC to Target BSC Transparent Container, which contains IEs such as the handover command and target cell SI request.

This section uses an inter-SGSN GSM-to-WCDMA PS handover as an example. The procedures for the intra-SGSN and inter-SGSN GSM-to-WCDMA PS handovers are similar. The only difference is that during intra-SGSN GSM-to-WCDMA PS handover, there is no inter-SGSN signaling interaction because the GSM cell and the WCDMA cell use the same SGSN.

Figure 7-3 shows the signaling procedure during handover preparation.

Figure 7-3 GSM-to-WCDMA PS handover preparation

1. The source BSS decides to initiate a PS handover to a WCDMA cell. At this point, both uplink and downlink user data is transmitted over the following: TBFs between the MS and the source BSS, BSSGP PFC tunnels between the source BSS and the 2G SGSN, GTP tunnels between the 2G SGSN and the GGSN.

2. The source BSS sends a PS Handover Required message, which carries the Target RNC Identifier information, to the 2G SGSN.

3. After detecting that the handover is an inter-RAT handover to WCDMA based on the Target RNC Identifier, the 2G SGSN sends a Forward Relocation Request messageto the 3G SGSN.

4. The 3G SGSN sends a Relocation Request message to request the target RNC to reserve resources in the target WCDMA cell.

The target RNC responds with a Relocation Request Acknowledge message after resources are reserved in the target RNC.

6. The 3G SGSN sends a Forward Relocation Response message to the 2G SGSN. The handover preparation is complete.

Figure 7-4 shows the signaling procedure during handover execution.

Figure 7-4 GSM-to-WCDMA PS handover execution

1. The 2G SGSN continues to receive downlink and uplink user plane data.

2. After receiving a Forward Relocation Response message from the 3G SGSN, the 2G SGSN may forward downlink data to the target RNC through the 3G SGSN. The target RNC then sends the data to the MS over the air interface.

3. The 2G SGSN continues the PS handover by sending a PS Handover Required Acknowledge message to the BSS. Before sending this message, the 2G SGSN, based on QoS, may suspend downlink data transfer for any PDP contexts.

4. The 2G SGSN forwards the GTP-U context to the target RNC.

5. The BSS sends a PS Handover Command message containing the Handover to UTRAN Command message to the MS, instructing the MS to hand over to the targetWCDMA cell.

6. The MS accesses the WCDMA cell.

7. After detecting that the MS has accessed the target cell, the RNC sends a Relocation Detect message to the 3G SGSN.

8. The MS sends a Handover to UTRAN Complete message to the RNC.

9. When the new source RNC-ID + S-RNTI are successfully exchanged with the MS, the RNC sends a Relocation Complete message to inform the 3G SGSN that the handover is complete.

10. The 3G SGSN sends a Forward Relocation Complete message to inform the 2G SGSN that the handover is complete and the reserved resources should be released.

11. The 3G SGSN sends an Update PDP Context Request message to the GGSN. The GGSN updates the PDP context fields. After the PDP context fields are updated, the GGSN sends new incoming downlink IP packets to the 3G SGSN instead of to the 2G SGSN.

12. The 2G SGSN performs the PFC procedure to release the corresponding resources.

13. The MS updates the route area. The handover is complete.

8 Related Features

Feature Prerequisite Feature Mutually Exclusive Feature

Affected Feature

GSM/WCDMAInteroperability

None None When the GSM/WCDMAInteroperability feature is used with the GBFD-511403 Extended BCCH feature, the delay in a location update after WCDMA-to-GSM cell reselection decreases and the CS paging success rate increases.

When the GSM/WCDMAInteroperability feature is used with GBFD-114325 Fast WCDMAReselection at 2G CS Call Release, an MS can reselect a WCDMA cell after releasing a call in a GSM cell. This reduces the number of location updates and the duration for the MSto camp on the GSM cell, increases the CS paging success rate, and improves user experience.

Feature Prerequisite Feature Mutually Exclusive Feature

Affected Feature

2G/3G Cell Reselection Based on MS State

None GBFD-116201 Network-Controlled Cell Reselection (NC2)

When the 2G/3G Cell Reselection Based on MS State feature is used with the GBFD-511403 Extended BCCH feature, the delay in a location update after WCDMA-to-GSM cell reselection decreases and the CS paging success rate increases.

When the 2G/3G Cell Reselection Based on MS State feature is used with GBFD-114325 Fast WCDMAReselection at 2G CS Call Release, an MS can reselect a WCDMA cell after releasing a call in a GSM cell. This reduces the number of location updates and the duration for the MSto camp on the GSM cell, increases the CS paging success rate, and improves user experience.

GSM/WCDMAService Based Handover

GBFD-114301GSM/WCDMAInteroperability

None None

GSM/WCDMALoad Based Handover


None None

Fast WCDMAReselection at 2G CS Call Release


None None

9 Impact on the Network

9.1 GSM/WCDMA Interoperability


The GSM/WCDMA Interoperability feature allows MSs to hand over to WCDMA cells in areas covered by both GSM and WCDMA networks. This increases the overall capacities of the GSM and WCDMA networks.


In areas covered by both GSM and WCDMA networks, this feature allows MSs to hand over to WCDMA cells. This increases PS data rates. In areas are covered by only theGSM network, this feature allows MSs to hand over to GSM cells. This ensures service continuity.

9.2 GSM/WCDMA Service Based Handover


The GSM/WCDMA Service Based Handover feature enables the CN to appropriately allocate services of different types to the GSM and WCDMA networks. This increases the overall capacities of the GSM and WCDMA networks. With this feature, the CN allocates CS services and low-rate PS services to the GSM network and high-rate PS services to the WCDMA network. This maximizes the peak throughput.


None

9.3 GSM/WCDMA Load Based Handover


The GSM/WCDMA Load Based Handover feature allows MSs to handover from a GSM cell to a WCDMA cell when the GSM cell is congested. This balances the load between the GSM and WCDMA networks, improves the overall capacities of the GSM and WCDMA networks, and prevents the system from being overloaded.


This feature decreases the congestion rate in GSM cells.

9.4 2G/3G Cell Reselection Based on MS State


The 2G/3G Cell Reselection Based on MS State feature allows MSs to reselect WCDMA cells in areas covered by both GSM and WCDMA networks. This increases the overall capacities of the GSM and WCDMA networks.


In areas covered by both GSM and WCDMA networks, this feature allows MSs to reselect WCDMA cells. This increases PS data rates. In areas are covered by only theGSM network, this feature allows MSs to reselect GSM cells. This ensures service continuity.

9.5 Fast WCDMA Reselection at 2G CS Call Release


The Fast WCDMA Reselection at 2G CS Call Release feature reduces the duration for MSs to camp on GSM cells and decreases the number of times that the MSs initiate services in GSM cells. This increases the overall capacities of the GSM and WCDMA networks.


This feature allows MSs to reselect WCDMA cells after releasing calls in GSM cells. This decreases the number of location updates and increases the CS paging success rate.

10 Engineering Guidelines

10.1 When to Use Interoperability Between GSM and WCDMA

10.1.1 GSM/WCDMA Interoperability

It is recommended that the GSM/WCDMA Interoperability feature be used with the following function:

Early classmark sending function: Set ECSC to YES(Yes) to enable this function. With this function, the BSC quickly determines whether MSs camping on a GSM cell are dual-mode MSs.

10.1.2 GSM/WCDMA Service Based Handover

It is recommended that the GSM/WCDMA Service Based Handover feature be used in scenarios where both the GSM and WCDMA networks are covered and differentiated QoS is supported by CS and PS services. With this feature, PS services are preferentially processed in the WCDMA network, whereas CS services are still processed in theGSM network.

10.1.3 GSM/WCDMA Load Based Handover

It is recommended that the GSM/WCDMA Load Based Handover feature be used in scenarios where both the GSM and WCDMA networks are covered and the GSMnetwork is overloaded. In coordination with the CN, this feature allocates CS services to the WCDMA network. This increases the resource usage of the WCDMA network, decreases the load and interference on the GSM network, and ensures the QoS of CS services.


When setting inter-RAT cell reselection parameters and handover thresholds, take note of the correlation between the GSM and TD-SCDMA parameters to prevent ping-pong cell reselections and handovers.

It is recommended that the 2G/3G Cell Reselection Based on MS State feature be used with the following function:

Early classmark sending function: Set ECSC to YES(Yes) to enable this function. With this function, the BSC quickly determines whether MSs camping on a GSM cell are dual-mode MSs.


None

10.2 Information to Be Collected


Before deploying the GSM/WCDMA Interoperability feature, collect the following information:

WCDMA network planning information: used for configuring neighboring cells.

Interoperability policies for operators, such as the requirements for setting inter-RAT cell reselection parameters and whether GSM-to-WCDMA CS handover is required: used to properly set specific parameters and determine whether to enable specific functions.


Before deploying the GSM/WCDMA Service Based Handover feature, collect the following information:

Whether the CN for GSM CS services supports GSM/WCDMA service-based handovers: used to determine whether this feature is allowed.


Before deploying the GSM/WCDMA Load Based Handover feature, collect the following information:

Load information about GSM cells, such as TCH congestion rate and proportion of TCHHs to all TCHs in GSM cells: used to set parameters related to this feature.


Before deploying the 2G/3G Cell Reselection Based on MS State feature, collect the following information:

WCDMA network planning information: used for configuring neighboring cells.

Interoperability policies for operators, such as the requirements for setting inter-RAT cell reselection parameters and whether GSM-to-WCDMA CS handover is required: used to properly set specific parameters and determine whether to enable specific functions.


Before deploying the 2G/3G Cell Reselection Based on MS State feature, collect the following information:

The proportion of WCDMA cells to all cells in specified areas

Whether GSM/WCDMA dual-mode MSs are used

10.3 Network Planning


RF Planning

N/A

Network Topology

For GSM cells to be enabled with the GSM/WCDMA Interoperability feature, plan neighboring cell configurations based on the topology of the adjacent WCDMA network. AGSM cell can be configured with a maximum of 64 neighboring WCDMA cells. These neighboring cells can use a maximum of three frequencies, with each frequency supporting a maximum of 32 neighboring WCDMA cells.

Hardware Planning

N/A


RF Planning

N/A

Network Topology

N/A

Hardware Planning

N/A


RF Planning

N/A

Network Topology

N/A

Hardware Planning

N/A


RF Planning

N/A

Network Topology

N/A

Hardware Planning

N/A


RF Planning

N/A

Network Topology

N/A

Hardware Planning

N/A

10.4 Overall Deployment ProcedureThe GSM/WCDMA Interoperability and 2G/3G Cell Reselection Based on MS State features, which are basic features, need to be deployed preferentially.

Other features are optional and can be enabled based on individual needs.

10.5 Deploying GSM/WCDMA InteroperabilityFor details about how to activate, verify, and deactivate this feature, see Configuring GSM/WCDMA Interoperability.

10.6 Deploying 2G/3G Cell Reselection Based on MS StateFor details about how to activate, verify, and deactivate this feature, see Configuring 2G/3G Cell Reselection Based on MS State.

10.7 Deploying GSM/WCDMA Service Based HandoverFor details about how to activate, verify, and deactivate this feature, see Configuring GSM/WCDMA Service Based Handover.

10.8 Deploying GSM/WCDMA Load Based HandoverFor details about how to activate, verify, and deactivate this feature, see Configuring GSM/WCDMA Load Based Handover.

10.9 Deploying Fast WCDMA Reselection at 2G CS Call ReleaseFor details about how to activate, verify, and deactivate this feature, see Configuring the Fast WCDMA Reselection at 2G CS Call Release.

10.10 Related Parameters in the System InformationGSM/WCDMA interoperability requires support from MSs. The radio access capability reported by an MS contains the PS handover field, which specifies whether the MS supports PS handover. After GSM/WCDMA interoperability is enabled, the early classmark sending function should be enabled so that MSs will report their support capabilities as early as possible. The early classmark sending function is enabled after ECSC is set to Yes. It is recommended that the value of SendUtranECSCFlag andCLASSMARKQUERY be set to YES.

When setting inter-RAT cell reselection parameters and handover thresholds, take note of the correlation between the GSM parameters and WCDMA parameters to avoid ping-pong handovers.

Telecom operators can control the cell reselection between GSM and WCDMA by setting parameters in the system information. For example, to allow MSs to access aWCDMA cell when available, it is recommended that QI be set to 7. In this manner, WCDMA cell search is always performed.

The value of FDDQOFF has a great impact on cell reselection. To allow MSs to preferentially access a WCDMA cell, it is recommended that the value of FDDQOFF be changed and the actual offset be set to a negative value.

When the value of FDDQOFF is smaller than 8, the corresponding actual offset is smaller than 0.

10.11 Neighboring WCDMA Cell ConfigurationTo enable GSM/WCDMA interoperability, GSM cells must be configured with neighboring WCDMA cells. Neighboring WCDMA cells can be configured at the BSS by adding external WCDMA cells. To configure WCDMA cells at the BSS, set UTRANCELLTYPE to FDD. One GSM cell can be configured with a maximum of 64 neighboring WCDMAcells. Those cells can work in a maximum of three frequencies. Each frequency accommodates a maximum of 32 cells.

10.12 Iur-g Interface Between GSM and WCDMAA BSC can be connected to a maximum of 16 RNCs over the Iur-g interface.

Information exchange is enabled when SPTINFOEXCHG is set to YES.

After information exchange is enabled, set INFOEXCHGLIST to CELLCAPCLASS or NACCRELATED.

10.13 GSM/WCDMA Inter-RAT NC2 and GSM/WCDMA Inter-RAT PS HandoverGSM/WCDMA inter-RAT PS handover requires support from the MS, RNC, BSC, and CN.

NC2 is enabled when NCO is set to NC2.

PS handover is supported when PSHOSUP is set to YES.

After the PS handover is enabled:

To enable the incoming GSM inter-RAT PS handover, set SPTINTERRATINBSCPSHO to SUPPORT.

To enable the incoming WCDMA inter-RAT PS handover, set SPTINTERRATOUTBSCPSHO to SUPPORT.

− If NCO is set to NC0 or NC1, NACCSPT must be set to YES.

− If NCO is set to NC2, the BSC performs the PS handover decision based on measurement reports from the MS and indications from the SGSN.

After NC2 and PS handover is enabled:

To enable quality-based NC2 cell reselection and quality-based handover, set URGENTRESELALLOW to PERMIT.

To enable load-based NC2 cell reselection and load-based handover, set LOADRESELALLOW to PERMIT.

To enable coverage-based NC2 cell reselection and coverage-based handover, set NORMALRESELALLOW to PERMIT

10.14 Performance Optimization

10.14.1 GSM/WCDMA Interoperability and 2G/3G Cell Reselection Based on MS State

Monitoring

Monitor the number of allowed FDD calls to check whether the GSM/WCDMA Interoperability and 2G/3G Cell Reselection Based on MS State features need to be optimized.

Parameter Optimization

If the number of allowed FDD calls is great, MSs are likely to camp on GSM cells. In addition to optimizing WCDMA coverage, modify the settings of SI-related parameters toincrease the possibility of GSM-to-WCDMA cell reselection. You are advised to set QI to 7 to ensure that MSs always search for 3G cells. In addition, you are advised to setFDDQMINOFFSET, FDDRSCPMIN, and FDDQMIN to small values, and FDDQOFF to a large value.

10.14.2 GSM/WCDMA Service Based Handover and GSM/WCDMA Load Based Handover

Monitoring

Monitor the inter-RAT outgoing cell handover success rate and call drop rate to check whether the GSM/WCDMA Service Based Handover and GSM/WCDMA Load Based Handover features need to be optimized.

Parameter Optimization

If the inter-RAT outgoing cell handover success rate is low, set RSCPOFF to a small value for increasing the number of candidate cells, and set HOSTAT3G to a large value for reducing the number of handovers.

If the call drop rate is high, set ECNOOFF, HODURT3G, and TRIGTHRES to small values for accelerating handover decisions.


N/A

10.15 TroubleshootingNone

11 ParametersTable 11-1 Parameter description

Parameter ID NE MML Command

Feature ID

Feature Name Description

BET3GHOEN BSC6900SET GCELLHOUTRANFDD(Optional)

GBFD-114301

GBFD-114302


GSM/TD-SCDMA Interoperability

Meaning: This parameter specifies whether to allow 3G better cell handover algorithm.

GUI Value Range: NO(No), YES(Yes)

Actual Value Range: NO, YES

Default Value: NO

Unit: None

CELLRXQUALWORSENRATIOTHRSH

BSC6900SET GCELLNC2PARA(Optional)

GBFD-116201

GBFD-511303

Network-Controlled Cell Reselection (NC2)

PS Handover Between GSMand LTE Based on Quality

Meaning: The number of times that the downlink transmission quality of the MS is lower than the transmission quality threshold of the MS ("EDGE GMSK Quality Threshold", "EDGE 8PSK Quality Threshold", or "GPRS Quality Threshold" by TBF type) is calculated accumulatively. When the rate of the accumulated value to the number of received measurement reports on the downlink transmission quality (Packet Downlink Ack/Nack message) is greater than or equal to the value of this parameter, the emergency reselection is triggered.

GUI Value Range: 0~100

Actual Value Range: 0~100

Default Value: 30

Unit: %

CELLSELECTAFTERCALLREL

BSC6900SET GCELLCCAD(Optional)

GBFD-114325

GBFD-511406

Fast WCDMAReselection at 2G CS Call Release

Meaning: This parameter specifies whether to allow a mobile phone to preferentially camp on a 3G cell after a call is terminated in the areas


Feature ID


covered by both the GSM network and the UMTS network.



Default Value: NO

Unit: None

CLASSMARKQUERY

BSC6900SET OTHSOFTPARA(Optional)

GBFD-110501

GBFD-114302

Call Control


Meaning: Whether to enable the BSC to include the 3G classmark information element in the Classmark Request message that the BSC forwards from the MSC to an MS



Default Value: NO

Unit: None

DlLdrThrd2GCell

BSC6900SET GCELLHOINTERRATLDB(Optional)

GBFD-511103

GSM andWCDMA Load Balancing Based on Iur-g

Meaning: When the downlink load of a cell is larger than the value of this parameter and is smaller than "2G Cell DL Overload Congest Thred", the downlink of the cell is in the basic congestion status.



Default Value: 90

Unit: None

DlOlcThrd2GCell


GBFD-511103


Meaning: When the downlink load of a cell is greater than the value, the downlink of the cell is in the overload congestion status.



Default Value: 100


Feature ID


Unit: None

ECNOOFF BSC6900ADD G3GNCELL(Optional)

MOD G3GNCELL(Optional)

GBFD-114301


Meaning: As a performance counter for 3G cells, Ec/No indicates the ratio of the energy per received chip to the spectral noise power density.

If the Ec/No of a 3G neighbor cell is greater than "HOECNOTH3G" plus this parameter, the neighbor cell is listed in the candidate cell queue.



Default Value: 3

Unit: dB

ECSC BSC6900SET GCELLCCBASIC(Optional)

GBFD-111101

GBFD-114302

System Information Sending


Meaning: The early classmark sending control (ECSC) parameter specifies whether the MSs in a cell use early classmark sending. After a successful immediate assignment, the MS sends additional classmark information to the network as early as possible. The additional classmark information mainly contains the CM3 (classmark 3) information. The CM3 (classmark 3) information contains the frequency band support capability of the MS (used for the future channel assignment), power information about each frequency band supported by the MS (used for the handover between different frequency bands), and encryption capability of the MS.



Feature ID



Default Value: YES

Unit: None

FDDCELLOFF BSC6900SET GCELLCCUTRANSYS(Optional)

GBFD-114301


Meaning: Offset of a FDD cell report.

When the priority of a 3G cell is sequenced, the value of this parameter be added to the receive level of the 3G cell in the measurement report.

The values of this parameter correspond to the following decibel values:

0: 0 dB

1: 6 dB

...

7: 42 dB



Default Value: 0

Unit: 6dB

FDDCELLTHRED

BSC6900SET GCELLCCUTRANSYS(Optional)

GBFD-114301


Meaning: Threshold of a FDD cell report.

When the receive level value in the measurement report of a 3G cell exceeds the value of this parameter, the measurement report takes effect. After the valid measurement report is filtered, the 3G cell joins the cell priority sequence.


0: 0 dB

1: 6 dB

...

6: 36 dB


Feature ID


7: positive infinity


Actual Value Range: 0~36, Positive infinity

Default Value: 0

Unit: 6dB

FDDFREQCNUM


GBFD-114301


Meaning: Number of UTRAN FDD cells that should be included in measurement report



Default Value: 2

Unit: None

FDDQMIN BSC6900SET GCELLCCUTRANSYS(Optional)

GBFD-114301


Meaning: This parameter specifies one of the parameters for FDD cell reselection.

A FDD cell becomes a candidate cell if all the following conditions are met for five consecutive seconds:

1.Receive level of the FDD cell > Average receive level of the current serving cell + "FDD Q offset";

The FDD cell meets the following condition in the case of any neighboring 2G cell: Receive level of the FDD cell > Receive level of any neighboring 2G cell + "FDD Q offset";

2. Ec/No of the FDD cell > "FDD Qmin" - "FDD Qmin Offset";

3. Receive level of the FDD cell > "RSCP Threshold";

If multiple FDD cells meet the preceding conditions, the MS reselects the cell with the strongest receive level.


Feature ID


See 3GPP TSs 45.008 and 25.304.


0: -20 dB,

1: -6 dB,

2: -18 dB,

3: -8 dB,

4: -16 dB,

5: -10 dB,

6: -14 dB,

7: -12 dB.


Actual Value Range: -20, -6, -18, -8, -16, -10, -14, -12

Default Value: 0

Unit: dB

FDDQMINOFFSET


GBFD-114301


Meaning: Offset of the minimum threshold for Ec/No during a FDD cell reselection.






If multiple FDD cells meet the


Feature ID


preceding conditions, the MS reselects the cell with the strongest receive level.

See 3GPP TSs 45.008 and 25.304.



Default Value: 0

Unit: dB

FDDQOFF BSC6900SET GCELLCCUTRANSYS(Optional)

GBFD-114301


Meaning: This parameter specifies one of the thresholds of the signal level for 3G cell reselection.







See 3GPP TSs 45.008 and 25.304.


0: - (always select a cell if


Feature ID


acceptable)

1: -28 dB,

2: -24 dB,

...

15: 28 dB.


Actual Value Range: Negative infinity, -28~28

Default Value: 8

Unit: 4dB

FDDREP BSC6900SET GCELLCCUTRANSYS(Optional)

GBFD-114301

GBFD-110801

GBFD-110802


Processing of Measurement Report

Pre-processing of Measurement Report

Meaning: This parameter specifies whether Ec/No or RSCP is used for the measurement report on a FDD cell. Ec/No stands for the signal-to-noise ratio. RSCP stands for the received signal code power.

GUI Value Range: RSCP(RSCP), EcN0(Ec/N0)

Actual Value Range: RSCP, EcN0

Default Value: RSCP

Unit: None

FDDRSCPMIN BSC6900SET GCELLCCUTRANSYS(Optional)

GBFD-114301


Meaning: Minimum level threshold of UTRAN cell reselection. During the cell reselection decision from a GSM cell to a FDD cell, this parameter is used to calculate the RSCP threshold of the target cell. A FDD cell becomes a candidate cell if all the following conditions are met for five consecutive seconds:


The FDD cell meets the


Feature ID


following condition in the case of any neighboring 2G cell: Receive level of the FDD cell > Receive level of any neighboring 2G cell + "FDD Q offset";




See 3GPP TSs 45.008 and 25.304.


0 = -114 dBm,

1 = -112 dBm,

2 = -110 dBm,

...

14 = -86 dBm,

15 = -84 dBm.


Actual Value Range: -114~-84

Default Value: 6

Unit: 2dBm

FDDRSCPQUALTHRSH

BSC6900ADD GEXT3GCELL(Optional)

MOD GEXT3GCELL(Optional)

GBFD-114301


Meaning: Minimum RSCP of the 3G FDD cell candidate



Default Value: 10

Unit: None

G2G3GLdBlcDeltaThrd

BSC6900SET OTHSOFTPARA(

GBFD-511103


Meaning: Use this parameter to set Load difference threshold for load-


Feature ID


Optional) GBFD-511408

based handovers between GSMand UMTS.

If the load balance between a 2G cell and a 3G cell is greater than the threshold, load balance istriggered.


Actual Value Range: -100~100

Default Value: 110

Unit: %

G2GLoadAdjustCoeff


GBFD-511103


Meaning: Coefficient used to modulate the load level of a 2G system so that the load level of the 2G system can be compared with that of a 3G system.



Default Value: 10

Unit: None

HODURT3G BSC6900ADD G3GNCELL(Optional)


GBFD-110601

GBFD-510501

HUAWEI I Handover

HUAWEI II Handover

Meaning: According to the P/N rule, if the conditions for the handover to a better 3G cell are met for P seconds within N seconds, the handover is triggered.

This parameter specifies the number P.


Actual Value Range: 0.5~16

Default Value: 8

Unit: 0.5s

HOECNOTH3G BSC6900SET GCELLHOUTRANFDD(Optional)

GBFD-114301


Meaning: The 3G better cell handover can betriggered only when the Ec/No of a neighboring 3G cell is greater than this threshold for a period of time.




Feature ID


Default Value: 35

Unit: dB

HOOPTSEL BSC6900SET GCELLHOUTRANFDD(Optional)

GBFD-110601

GBFD-510501

GBFD-114301

GBFD-114302

HUAWEI I Handover

HUAWEI II Handover



Meaning: This parameter specifies whether a 2G cell or to a 3G cell is preferentially selected as the target cell for handover. When this parameter is setto Pre_2G_Cell, the BSC preferentially selects a 2G candidate cell as the target cell for handover. When this parameter is set to Pre_3G_Cell, the BSC preferentially selects a 3G candidate cell as the target cell for handover. When this parameter is set to Pre_2G_CellThres, the BSC preferentially selects a neighboring 3G cell as the handover target cell if the receive level of the neighboring 2G cell that ranks the first in the candidate cell list is equal to or smaller than "HO Preference Threshold for 2G Cell". Otherwise, the BSC preferentially selects a neighboring 2G cell as the handover target cell.

GUI Value Range: Pre_2G_Cell(Preference for 2G cell), Pre_3G_Cell(Preference for 3G cell), Pre_2G_CellThres(Preference 2G cell by thresh)

Actual Value Range: Pre_2G_Cell, Pre_3G_Cell, Pre_2G_CellThres

Default Value: Pre_2G_CellThres

Unit: None

HOPRETH2G BSC6900SET GCELLH

GBFD- HUAWEI I Handover Meaning: If the receive level of the neighboring 2G cell


Feature ID


OUTRANFDD(Optional)

110601

GBFD-510501

GBFD-114301

GBFD-114302

HUAWEI II Handover



that ranks the first in the candidate cell list is equal to or smaller than this threshold, the BSC preferentially selects a neighboring 3G cell as the handover target cell. Otherwise, the BSC preferentially selects a neighboring 2G cell as the handover target cell.



Default Value: 25

Unit: dB

HORSCPTH3G BSC6900SET GCELLHOUTRANFDD(Optional)

GBFD-114301

GBFD-114302



Meaning: The 3G better cell handover is triggeredonly when the RSCP of a neighboring 3G cell is greater than this threshold for a period of time.



Default Value: 50

Unit: dB

HOSTAT3G BSC6900ADD G3GNCELL(Optional)


GBFD-110601

GBFD-510501

HUAWEI I Handover

HUAWEI II Handover

Meaning: According to the P/N rule, if the conditions for the handover to a better 3G cell are met in P of N measurement reports, the handover istriggered.

This parameter specifies the number N.


Actual Value Range: 0.5~16

Default Value: 10

Unit: 0.5s

INFOEXCHGLIST

BSC6900ADD GNRNC(Mandatory)

MOD

MRFD-211402

GBFD-511102

MBSC Load Balancing

NACC Procedure Optimization Based on Iur-g between GSMand WCDMA

Meaning: Information exchange content to be supported

GUI Value Range: CELLCAPCLASS(Cell


Feature ID


GNRNC(Mandatory)

GBFD-511402

Radio Resource Reserved Handover BetweenGSM/TD-SCDMA Based on Iur-g

Capacity Info), NACCRELATED(NACC Info)

Actual Value Range: CELLCAPCLASS, NACCRELATED

Default Value: CELLCAPCLASS

Unit: None

INTERRATCELLRESELEN

BSC6900SET GCELLHOBASIC(Optional)

GBFD-511104

GBFD-114302

GSM andWCDMATraffic Steering Based on Iur-g


Meaning: This parameter specifies whether the reselection from 2G cells to 3G cells is allowed.



Default Value: NO

Unit: None

INTERRATINBSCHOEN


GBFD-114301

GBFD-114302

GBFD-511103

GBFD-511402





Meaning: This parameter specifies whether the handover from 3G cells to 2G cells is allowed. When this parameter is set to NO, the parameter is invalid if the source cell identifier contained in a 3G-to-2G cell handover request is CGI (not SAI).



Default Value: NO

Unit: None

INTERRATOUTBSCHOEN


GBFD-114301

GBFD-114302

GBFD-511103




Meaning: This parameter specifies whether the handover from 2G cells to 3G cells is allowed.




Feature ID


Default Value: NO

Unit: None

IntRATLoadHOEcNoThr


GBFD-511103


Meaning: Minimum Ec/No value of a 3G cell during the load-based GSM-to-UMTS handover



Default Value: 25

Unit: dB

IntRATLoadHORSCPThr


GBFD-511103


Meaning: Minimum RSCP value of a 3G cell during the load-based GSM-to-UMTS handover



Default Value: 30

Unit: dB

InterRATLoadHoEcNoBandWidth


GBFD-511103


Meaning: Width of load band [EcNo] during the inter-RAT hierarchical load-based handover



Default Value: 20

Unit: dB

InterRATLoadHoEcNoStart


GBFD-511103


Meaning: Initial EcNo value of the inter-RAT load-based handover band



Default Value: 49

Unit: dB

InterRATLoadHoRSCPBandWidth


GBFD-511103


Meaning: Width of load band [RSCP] during the inter-RAT hierarchical load-based handover



Feature ID



Default Value: 60

Unit: dB

InterRATLoadHoRSCPStart


GBFD-511103


Meaning: Initial RSCP value of the inter-RAT load-based handover band



Default Value: 91

Unit: dB

InterRatCsServiceLoadHoThrd


GBFD-511103


Meaning: Threshold for setting the flag of accepting inter-RAT CS service handover of a 2G cell



Default Value: 80

Unit: None

InterRatServiceLoadHoSwitch


GBFD-511103

GBFD-511407

GBFD-511408

GBFD-511104


GSM andWCDMATraffic Steering Based on Iur-g

Meaning: When this parameter is set to Service-based, the inter-RAT handover is triggered on the basis of the service distribution. In this case, the target cell is selected this parameter is set to Load-based, the inter-RAT handover is triggered on the basis of the load balance. In this case, the target cell is selected according to the traffic load on the target cell and the load difference between 2G and 3G cells.

When this parameter is set to Dynamic Service/Load based, the target cell is dynamically selected by using the service-based algorithm or the load-based algorithm according to the traffic load on the cell.

When this parameter is


Feature ID


set to CN Service-based, the inter-RAT handover decision is made on the basis of the service attribute of the core network.

When this parameter is set to OFF, no inter-RAT service handover or inter-RAT load handover in the access state is performed.

GUI Value Range: Service-based(Service-based), Load-based(Load-based), Dynamic-based(Dynamic Service/Load-based), CnService-based(CN Service-based), OFF(OFF)

Actual Value Range: Service-based, Load-based, Dynamic-based,

CnService-based, OFF

Default Value: OFF

Unit: None

LOADRESELALLOW


GBFD-116201

GBFD-511304

GBFD-511307


PS Handover Between GSMand LTE Based on Cell Load

eNC2 BetweenGSM and LTE

Meaning: Whether to allow the cell load reselection. If this parameter is set to PERMIT and "NC2 Load Reselection Switch" is set to Support, the load of the target cell is involved in the algorithm for NC2 cell reselection.

GUI Value Range: FORBID(Forbid), PERMIT(Permit)

Actual Value Range: FORBID, PERMIT

Default Value: PERMIT

Unit: None

LOADRESELMAXRXLEV


GBFD-116201

GBFD-511304



Meaning: Threshold for allowing the MS to reselect a cell during load reelection. When the receive level of the serving cell is lower than this


Feature ID


threshold, the load reselection is triggered.



Default Value: 40

Unit: None

LOADRESELRXTHRSH


GBFD-116201

GBFD-114301

GBFD-114322

GBFD-511304

GBFD-511310





Multi Technology Neighbour Cell Based Handover

Meaning: When the uplink load or downlink load of the target cell is lower than this threshold, it can accept the MSs from the serving cell due to load reselection.



Default Value: 60

Unit: %

LOADRESELSTARTTHRSH


GBFD-116201

GBFD-511304



Meaning: When the uplink load or downlink load of the cell exceeds this threshold, the load reselection decision is made.



Default Value: 85

Unit: %

MINACCRXLEVBSC6900SET GCELLNC2PARA(Optional)

GBFD-116201

GBFD-511302

GBFD-511303

GBFD-511304

GBFD-511306


PS Handover Between GSMand LTE Based on Coverage



GSM/LTE Service Based PS Handover

Meaning: Minimum receive level for a neighbor cellto become a candidate cell during cell reselection. When the receive level of the serving cell is lower than the value of this parameter, it indicates that the normal cell reselection level is bad. In this case, the parameter value is used for the calculation of the times of the occurrence of bad normal cell reselection level.




Feature ID


Default Value: 15

Unit: None

NACCSPT BSC6900SET GCELLGPRS(Optional)

GBFD-116301

GBFD-119502

Network Assisted Cell Change (NACC)

PS Handover

Meaning: Whether to support Network Assisted Cell Change (NACC). NACC is used in the network control mode NC0, NC1 or NC2. When an MS is in packet transfer mode, the NACC enables the network to notify the MS in advance of the system information about neighboring cells, accelerating cell reselection for MSs.



Default Value: NO

Unit: None

NC2LoadResel BSC6900SET BSCPSSOFTPARA(Optional)

GBFD-116201


Meaning: Whether to involve the load of the target cell in the algorithm for NC2 cell reselection. If this parameter is set to Support, the load of the target cell is involved in the algorithm for NC2 cell reselection.

GUI Value Range: NotSupport(Not Support), Support(Support)

Actual Value Range: NOTSUPPORT, SUPPORT

Default Value: NOTSUPPORT

Unit: None

NC2SPT BSC6900SET GCELLGPRS(Optional)

GBFD-116201

GBFD-119502

GBFD-511307


PS Handover


Meaning: Whether to support network control 2 (NC2). In NC2 mode, an MS sends the BSC measurement reports containing information about the serving cell and neighboring cells, and the


Feature ID


GBFD-511310


network controls cell reselection for the MS.



Default Value: NO

Unit: None

NCO BSC6900SET GCELLPSBASE(Optional)

GBFD-119107

GBFD-114302

GBFD-119502

GBFD-111101

GBFD-511307

GBFD-511310

Networking Control Mode


PS Handover




Meaning: Network control mode for cell reselection of the MS. There are three modes. NC0: normal MS control. The MS shall perform autonomous cell re-selection. NC1: MS control with measurement reports. The MS shall send measurement reports tothe network and the MS shall perform autonomous cell re-selection. NC2: network control. The MS shall send measurement reports to the network. The MS shall only perform autonomous cell re-selection when the reselection is triggered by a downlink signaling failure or a random access failure. When this parameter is set to NC2 and "Support NC2" in "SET GCELLGPRS" is set to"YES", the network side can control the cell reselection for the MS.

GUI Value Range: NC0(NC0), NC1(NC1), NC2(NC2)

Actual Value Range: NC0, NC1, NC2

Default Value: NC0

Unit: None

NORMALRESELALLOW

BSC6900SET GCELLNC2PARA(

GBFD-116201


Meaning: Whether to allow the cell normal reselection. If this parameter is


Feature ID


Optional) GBFD-511302

GBFD-511307



set to PERMIT and "NC2 Load Reselection Switch" is set to Support, the load of the target cell is involved in the algorithm for NC2 cell reselection.




Unit: None

OutSysLoadHoEn


MRFD-211402

MBSC Load Balancing Meaning: This parameter specifies whether to allow the inter-RAT load handover in connection mode (after the assignment is complete).



Default Value: NO

Unit: None

PENALTYRXLEV


GBFD-116201

GBFD-511302

GBFD-511303

GBFD-511304

GBFD-511306

GBFD-511310







Meaning: When the cell reselection failure message is received or the load cell reselection is initiated, the "Cell Penalty Level" is subtracted from the receive level of the target cell to avoid that cell reselection failure occurs repeatedly or that multiple MSs are reselected to the same target cell. This parameter is valid only within "Cell Penalty Duration".



Default Value: 30

Unit: None

PFCSUP BSC6900ADD GBFD- Streaming QoS(GBR) Meaning: Whether the NSE


Feature ID


NSE(Optional)

MOD NSE(Optional)

119901

GBFD-511310


supports the Packet Flow Context (PFC) procedure that can improve Quality of Service (QoS) of packet services.

In SGSN Pool scenario, the PFC procedure will take effect when the following conditions are met:

All the NSEs to which all the PTP BVCs in the cell belong support PFC (that is, "PFC Support" is setto YES).

The SGSN supports PFC.

The "Support GBR QoS" parameter in the "SET GCELLPSOTHERPARA" command is set to YES.

GUI Value Range: NO(No Support), YES(Support)


Default Value: NO

Unit: None

PSHOSUP BSC6900ADD NSE(Optional)

MOD NSE(Optional)

GBFD-119502

PS Handover Meaning: Whether to support PS Handover(PS HO). The PS HO is used to reduce the interval of the cell reselection of the MS.



Default Value: NO

Unit: None

QCI BSC6900SET GCELLCCUTRANSYS(Optional)

GBFD-114301

GBFD-114302



Meaning: This parameter specifies the threshold of the signal level for cell reselection in connection mode before ""Qsearch C"" is obtained.

GUI Value Range: Use_Qsearch_I(Use Qsearch_I), Always(Always)


Feature ID


Actual Value Range: Use_Qsearch_I, Always

Default Value: Use_Qsearch_I

Unit: None

QI BSC6900SET GCELLCCUTRANSYS(Optional)

GBFD-114301

GBFD-114302



Meaning: This parameter specifies the level threshold for cell reselection in idle mode. In idle mode, if the signal level of the serving cell is below [0, 7] or above [8, 15], the MS starts to search for 3G cells. For example, if this parameter is set to 5 and if the signal level of the serving cell is lower than 5, the MS starts to search for 3G cells; if this parameter is set to 10 and if the signal level of the serving cell is above 10, then the MS starts tosearch for 3G cells.


0: -98 dBm

1: -94 dBm

2: -90 dBm

3: -86 dBm

4: -82 dBm

5: -78 dBm

6: -74 dBm

7: (always), that is, the MS keeps searching for 3G cells

8: -78 dBm

9: -74 dBm

10: -70 dBm

11: -66 dBm

12: -62 dBm

13: -58 dBm

14: -54 dBm

15: Positive infinity (never),


Feature ID


that is, the MS does not search for 3G cells.


Actual Value Range: -98, -94, -90, -86, -82, -78, -74, (always), -78, -74, -70, -66, -62, -58, -54, Positive

infinity(never)

Default Value: 15

Unit: None

QP BSC6900SET GCELLCCUTRANSYS(Optional)

GBFD-114301

GBFD-114302



Meaning: This parameter specifies one threshold of the signal level for cell reselection in packet transfer mode. In packet transfer mode, if the signal level of the serving cell is below [0, 7] or above [8, 15], the MS starts to search for 3G cells. For example, if this parameter is set to 5 and if the signal level of the serving cell is lower than 5, the MS starts to search for 3G cells; if this parameter is set to 10 and if the signal level of the serving cell is above 10, then the MS starts to search for 3G cells.

The values of this parameter correspond to the following decibel values: 0: -98 dBm 1: -94 dBm ... 6: -74 dBm 7: (always) 8: -78 dBm 9: -74 dBm ... 14: -54 dBm 15: Positive infinity (never)


Actual Value Range: -98, -94, -90, -86, -82, -78, -74, (always),

-78, -74, -70, -66, -62, -58, -54, Positive

infinity(never)

Default Value: 15

Unit: None


Feature ID


QSEARCHC BSC6900SET GCELLCCUTRANSYS(Optional)

GBFD-114301

GBFD-114302



Meaning: In connection mode, if the signal level is below [0-7] or above [8-15], the MS starts to search for 3G cells. For example, if this parameter is set to 5 and if the signal level of the serving cell is lower than 5, the MS starts to search for 3G cells; if this parameter is set to 10 and if the signal level of the serving cell is above 10, then the MS starts to search for 3G cells. 0: -98 dBm

1: -94 dBm

...

6: -74 dBm

7: (always)

8: -78 dBm

9: -74 dBm

...

14: -54 dBm

15: Positive infinity (never)


Actual Value Range: -98, -94, -90, -86, -82, -78, -74, (always), -78, -74, -70, -66, -62, -58, -54, Positive infinity(never)

Default Value: 15

Unit: None

RESELHYST BSC6900SET GCELLNC2PARA(Optional)

GBFD-116201

GBFD-511302

GBFD-511303

GBFD-




Meaning: Indicating that during cell reselection, the level of the target cell should meet the following condition: Level of target cell > [MAX (level of serving cell, "Cell Reselection Level Threshold") + "Cell Reselection Hysteresis"]. In


Feature ID


511304

GBFD-511306

GBFD-511310




this way, ping-pong handovers do not occur.



Default Value: 6

Unit: None

RESELWATCHPERIOD


GBFD-116201

GBFD-511302



Meaning: The number of received Packet Measurement Report messages on the receive level of the serving cell is measured continuously. When the statistical value is greater than or equalto the value of this parameter, the normal reselection decision is made.



Default Value: 10

Unit: None

RESELWORSENLEVTHRSH


GBFD-116201

GBFD-511302



Meaning: If the number of times when the receive level of the serving cell within "Normal Cell Reselection Watch Period" is lower than "Cell Reselection Level Threshold" is greater than the value of this parameter, the normal cell reselection is triggered.



Default Value: 1

Unit: None

RIMSUP BSC6900ADD NSE(Optional)

MOD NSE(Optional)

GBFD-116301

GBFD-511308

Network Assisted Cell Change (NACC)

eNACC Between GSMand LTE

Meaning: Whether to support RAN information management (RIM). In the RIM procedure, RANs (Radio Access Network) can exchange messages through the core network.


Feature ID




Default Value: NO

Unit: None

RSCPOFF BSC6900ADD G3GNCELL(Optional)


GBFD-114301

GBFD-114302

GBFD-511407



Meaning: This parameter adjusts "Min RSCP threshold" to enable the selection of 3G candidate cells based on cell priorities



Default Value: 3

Unit: dB

SPTCOMMMEAS

BSC6900ADD GNRNC(Optional)

MOD GNRNC(Optional)

MRFD-211402

MBSC Load Balancing Meaning: Whether to support the common bidirectional measurement procedure on the Iur-g interface.



Default Value: NO

Unit: None

SPTINFOEXCHG

BSC6900ADD GNRNC(Optional)

MOD GNRNC(Optional)

MRFD-211402

GBFD-511102

GBFD-511402

MBSC Load Balancing

NACC Procedure Optimization Based on Iur-g between GSMand WCDMA


Meaning: Whether to support the bidirectional information exchange procedure on the Iur-g interface.



Default Value: NO

Unit: None

SPTINTERRATINBSCPSHO

BSC6900SET GCELLGPRS(Optional)

GBFD-119502

PS Handover Meaning: Whether to support In Inter-RAT Inter-cell PS Handover. The MS in the UMTS cell can be handed over to the BSC local cell through PS handover


Feature ID


algorithm.

GUI Value Range: UNSUPPORT(Not Support), SUPPORT(Support)

Actual Value Range: UNSUPPORT, SUPPORT

Default Value: UNSUPPORT

Unit: None

SPTINTERRATOUTBSCPSHO

BSC6900SET GCELLGPRS(Optional)

GBFD-119502

PS Handover Meaning: Whether support Out Inter-RAT Inter-Cell PS Handover. The MS in the BSC local cell can be handed over to the UMTS cell through PS handover algorithm.

GUI Value Range: UNSUPPORT(Not Support), SUPPORT(Support)

Actual Value Range: UNSUPPORT, SUPPORT

Default Value: UNSUPPORT

Unit: None

SYSFLOWLEV BSC6900SET GCELLHOAD(Optional)

GBFD-110601

GBFD-510501

HUAWEI I Handover

HUAWEI II Handover

Meaning: System flux thresholds correspond to the system flux obtained based on message packets, CPU load, and FID queuing load. The system flux level is the current flux control level of the system.

0-11: There are 12 flow control levels. Where, 0 indicates the lowest level and 11 indicates the highest level.

A load handover is allowed only when the system flux is lower than the value of this parameter. The handover performed over the maximum threshold may have tremendous impacts on the system. Thus, this parameter


Feature ID


should not be set to a higher value. 1) The flow control level algorithm for the assigned system messages: [(Average Message Usage - Inner Flow Control Discard Begin Threshold)/(Inner Flow Control Discard All Threshold - Inner Flow Control Discard Begin Threshold) x 100]/10+1 (round-down for division operation). If the value is smaller than Inner Flow Control Discard Begin Threshold, Level 0 is used. If the value is equal to or greater than Inner Flow Control Discard Begin Threshold, the level is calculated. The value range is from 0 to 11.

2) Flow control threshold for the CPU to start todiscard the channel access messages and paging messages: 80%

. Flow control threshold for the CPU to discard all channel access messages and paging messages: 100%

. CPU usage smaller than 80% corresponds to level 0. CPU usage equal to or greater than CPU flow control threshold 80% corresponds to level 2. An increase of 5% means an increase of 2 levels. Level 10 is the highest. The level value can be 0, 2, 4, 6, 8, and 10.

GUI Value Range: 0, 8~11

Actual Value Range: 0, 8~11

Default Value: 10


Feature ID


Unit: None

Send2QuterFlag


GBFD-111101

GBFD-114302



Meaning: This parameter specifies whether the SI Type 3 message contains the 2QUATER indicator.



Default Value: YES

Unit: None

SendUtranECSCFlag


GBFD-111101

GBFD-114302



Meaning: Whether the SI Type 3 message contains the 3G Early Classmark Sending Restriction field. The 3G Early Classmark Sending Restriction field is used to notify the MS of whether the early classmark message contains the 3G classmark message. This parameter is valid for dual-mode MSs and is invalid for single-mode MSs.



Default Value: YES

Unit: None

TRIGTHRES BSC6900SET GCELLHOAD(Optional)

GBFD-110601

GBFD-510501

HUAWEI I Handover

HUAWEI II Handover

Meaning: The load handover is triggered when the traffic load in a cell is greater than the value of this parameter.



Default Value: 90

Unit: None

TrafficReselAllow


GBFD-511306

GBFD-


eNC2 BetweenGSM and

Meaning: Whether to allow the cell service reselection. When this parameter is set to"PERMIT", the Radio


Feature ID


511307 LTE Access Technology (RAT) of the candidate cell is considered in the algorithm for cell service reselection.




Unit: None

URGENTRESELALLOW


GBFD-116201

GBFD-511303

GBFD-511307




Meaning: Whether to allow cell urgent reselection. If this parameter is set to PERMIT and "NC2 Load Reselection Switch" is set to Support, the load of the target cell is involved in the algorithm for NC2 cell reselection.




Unit: None

UTRANCELLTYPE

BSC6900ADD GEXT3GCELL(Mandatory)

MOD GEXT3GCELL(Optional)

GBFD-114301

GBFD-114302



Meaning: This parameter specifies the type of a 3G cell. A cell type can be Frequency Division Duplex (FDD) or Time Division Duplex (TDD).

GUI Value Range: FDD(FDD), TDD(TDD)

Actual Value Range: FDD, TDD

Default Value: None

Unit: None

UlLdrThrd2GCell


GBFD-511103


Meaning: When the uplink load of a cell is larger than the value of this parameter and is smaller than "2G Cell UL Overload Congest Thred",


Feature ID


the uplink of the cell is in the basic congestion status.



Default Value: 90

Unit: None

UlOlcThrd2GCell


GBFD-511103


Meaning: When the uplink load of a cell is greater than the value, the uplink of the cell is in the overload congestion status.



Default Value: 100

Unit: None

12 CountersTable 12-1 Counter description

Counter ID

Counter Name Counter Description

Feature ID

Feature Name

1278082417

CELL.INTERRAN.INCELL.HO.REQ.SD H3600:Incoming Inter-RAT Inter-Cell Handover Requests (SDCCH)

GBFD-114301

GBFD-114302



1278082418

CELL.INTERRAN.INCELL.HO.REQ.TCH H3609:Incoming Inter-RAT Inter-Cell Handover Requests (TCH)

GBFD-114301

GBFD-114302



1278082419

CELL.INTERRAN.INCELL.HO.REQ.ACK.SD H3610:Incoming Inter-RAT Inter-Cell Handover Responses (SDCCH)

GBFD-114301

GBFD-114302



1278082420

CELL.INTERRAN.INCELL.HO.REQ.ACK.TCHF H3617:Incoming Inter-RAT Inter-Cell Handover Responses (TCHF)

GBFD-114301

GBFD-114302



1278082421

CELL.INTERRAN.INCELL.HO.REQ.ACK.TCHH H3618:Incoming Inter-RAT Inter-Cell Handover Responses (TCHH)

GBFD-114301

GBFD-1143



Counter ID


Feature ID

Feature Name

02

1278082422

CELL.INTERRAN.INCELL.HO.FAIL.SD H3620:Failed Incoming Inter-RAT Inter-Cell Handovers (SDCCH)

GBFD-114301

GBFD-114302



1278082423

CELL.INTERRAN.INCELL.HO.FAIL.TCHF H3627:Failed Incoming Inter-RAT Inter-Cell Handovers (TCHF)

GBFD-114301

GBFD-114302



1278082424

CELL.INTERRAN.INCELL.HO.FAIL.TCHH H3628:Failed Incoming Inter-RAT Inter-Cell Handovers (TCHH)

GBFD-114301

GBFD-114302



1278082425

CELL.INTERRAN.INCELL.HO.FAIL.INVALID.CONTENTS

H362J:Failed Incoming Inter-RAT Inter-Cell Handovers (Invalid Message)

GBFD-114301

GBFD-114302



1278082426

CELL.INTERRAN.INCELL.HO.FAIL.CONG.SD H3620A:Failed Incoming Inter-RAT Inter-Cell Handovers (No Channel Available) (SDCCH)

GBFD-114301

GBFD-114302



1278082427

CELL.INTERRAN.INCELL.HO.FAIL.CONG.TCH H3629A:Failed Incoming

GBFD-

GSM/WCDM

Counter ID


Feature ID

Feature Name

Inter-RAT Inter-Cell Handovers (No Channel Available) (TCH)

114301

GBFD-114302

AInteroperability


1278082428

CELL.INTERRAN.INCELL.HO.FAIL.NO.CIC H362E:Failed Incoming Inter-RAT Inter-Cell Handovers (CIC Unavailable)

GBFD-114301

GBFD-114302



1278082429

CELL.INTERRAN.INCELL.HO.FAIL.CIC.ALLOC H362F:Failed Incoming Inter-RAT Inter-Cell Handovers (CIC Allocated)

GBFD-114301

GBFD-114302



1278082430

CELL.INTERRAN.INCELL.HO.FAIL.APPLY.TRSL.FAIL

H362B:Failed Incoming Inter-RAT Inter-Cell Handovers (Terrestrial Resource Request Failed)

GBFD-114301

GBFD-114302



1278082431

CELL.INTERRAN.INCELL.HO.FAIL.MSC.CLR.CMD H362H:Failed Incoming Inter-RAT Inter-Cell Handovers (Clear Commands Sent By MSC)

GBFD-114301

GBFD-114302



1278082432

CELL.INTERRAN.INCELL.HO.FAIL.EXP.SD H3620C:Failed Incoming Inter-RAT Inter-Cell Handovers

GBFD-114301


GSM/TD-SCDMA

Counter ID


Feature ID

Feature Name

(Timer Expired) (SDCCH)

GBFD-114302

Interoperability

1278082433

CELL.INTERRAN.INCELL.HO.FAIL.EXP.TCH.SIG H3629Cb:Failed Incoming Inter-RAT Inter-Cell Handovers (Timer Expired) (TCH) (Signaling Channel)

GBFD-114301

GBFD-114302



1278082434

CELL.INTERRAN.INCELL.HO.FAIL.EXP.TCH.TRAF.CH

H3629Ca:Failed Incoming Inter-RAT Inter-Cell Handovers (Timer Expired) (TCH) (Traffic Channel)

GBFD-114301

GBFD-114302



1278082435

CELL.INTERRAN.INCELL.HO.REQ CH360:Incoming Inter-RAT Inter-Cell Handover Requests

GBFD-114301

GBFD-114302



1278082436

CELL.INTERRAN.INCELL.HO.SUCC CH363:Successful Incoming Inter-RAT Inter-Cell Handovers

GBFD-114301

GBFD-114302



1278082437

CELL.INTERRAN.INCELL.HO.SUCC.RATE TH363:Success Rate of Incoming Inter-RAT Inter-Cell

GBFD-114301

GBF



Counter ID


Feature ID

Feature Name

Handover D-114302

1278082438

CELL.INTERRAN.INCELL.HO.REQ.ACK CH361:Incoming Inter-RAT Inter-Cell Handover Responses

GBFD-114301

GBFD-114302



1278082439

CELL.INTERRAN.INCELL.HO.FAIL H362:Failed Incoming Inter-RAT Inter-Cell Handovers

GBFD-114301

GBFD-114302



1278082440

CELL.INTERRAN.INCELL.HO.FAIL.EXP H362C:Failed Incoming Inter-RAT Inter-Cell Handovers (Timer Expired)

GBFD-114301

GBFD-114302



1278082441

CELL.INTERRAN.INCELL.HO.FAIL.NO.SPEECH.VER

H362L:Failed Incoming Inter-RAT Inter-Cell Handovers (Requested Speech Version Unavailable)

GBFD-114301

GBFD-114302



1278083417

CELL.INTERRAN.OUTCELL.HO.REQ.NOT.INCLUDE.DR.SD

H3500:Outgoing Inter-RAT Inter-Cell Handover Requests (SDCCH) (Excluding Directed

GBFD-114301

GBFD-1143



Counter ID


Feature ID

Feature Name

Retry) 02

1278083418

CELL.INTERRAN.OUTCELL.HO.REQ.TCHF H3507:Outgoing Inter-RAT Inter-Cell Handover Requests (TCHF)

GBFD-114301

GBFD-114302



1278083419

CELL.INTERRAN.OUTCELL.HO.REQ.TCHH H3508:Outgoing Inter-RAT Inter-Cell Handover Requests (TCHH)

GBFD-114301

GBFD-114302



1278083420

CELL.INTERRAN.OUTCELL.HO.CMD.NOT.INCLUDE.DR.SD

H3510:Outgoing Inter-RAT Inter-Cell Handover Commands (SDCCH) (Excluding Directed Retry)

GBFD-114301

GBFD-114302



1278083421

CELL.INTERRAN.OUTCELL.HO.CMD.TCHF H3517:Outgoing Inter-RAT Inter-Cell Handover Commands (TCHF)

GBFD-114301

GBFD-114302



1278083422

CELL.INTERRAN.OUTCELL.HO.CMD.TCHH H3518:Outgoing Inter-RAT Inter-Cell Handover Commands (TCHH)

GBFD-114301

GBFD-114302



127808 CELL.INTERRAN.OUTCELL.HO.FAIL.NOT.INCLUDE H3520:Failed GBF GSM/

Counter ID


Feature ID

Feature Name

3423 .DR.SD Outgoing Inter-RAT Inter-Cell Handovers (SDCCH) (Excluding Directed Retry)

D-114301

GBFD-114302

WCDMAInteroperability


1278083424

CELL.INTERRAN.OUTCELL.HO.FAIL.TCHF H3527:Failed Outgoing Inter-RAT Inter-Cell Handovers (TCHF)

GBFD-114301

GBFD-114302



1278083425

CELL.INTERRAN.OUTCELL.HO.FAIL.TCHH H3528:Failed Outgoing Inter-RAT Inter-Cell Handovers (TCHH)

GBFD-114301

GBFD-114302



1278083426

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.ABNORM.REL.UNS

H352Da:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Abnormal Release, Unspecified)

GBFD-114301

GBFD-114302



1278083427

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.ABNORM.REL.CHN

H352Db:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Abnormal Release,

GBFD-114301

GBFD-114302



Counter ID


Feature ID

Feature Name

Channel Unacceptable)

1278083428

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.ABNORM.REL.T.E

H352Dc:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Abnormal Release, Timer Expired)

GBFD-114301

GBFD-114302



1278083429

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.ABNORM.REL.NO.ACT

H352Dd:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Abnormal Release, No Activity on the Radio Path)

GBFD-114301

GBFD-114302



1278083430

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.PREEMPT.RLS

H352De:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Preemptive Release)

GBFD-114301

GBFD-114302



1278083431

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.HO.TA

H352Df:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Handover Failed, Timing

GBFD-114301

GBFD-114302



Counter ID


Feature ID

Feature Name

Advance out of Range)

1278083432

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.NO.CH.MODE

H352Dg:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Channel Mode Unavailable)

GBFD-114301

GBFD-114302



1278083433

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.FREQ H352Dh:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Frequency Unavailable)

GBFD-114301

GBFD-114302



1278083434

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.CALL.CLR

H352Di:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Call Already Cleared)

GBFD-114301

GBFD-114302



1278083435

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.SEMANT

H352Dj:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Semantically Incorrect Message)

GBFD-114301

GBFD-114302



127808 CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.INV.M H352Dk:Faile GBF GSM/

Counter ID


Feature ID

Feature Name

3436 AN d Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Invalid Mandatory Information)

D-114301

GBFD-114302



1278083437

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.MSG.TYPE.NEXISTENT

H352Dl:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Message Type Non-existent or Not Implemented)

GBFD-114301

GBFD-114302



1278083438

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.MSG.TYPE.NOT.COMPATIBLE

H352Dm:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Message Type Not Compatible with Protocol State)

GBFD-114301

GBFD-114302



1278083439

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.CONDITION.IE.ERR

H352Dn:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Conditional IE Error)

GBFD-114301

GBFD-114302



127808 CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.NO.C H352Do:Faile GBF GSM/

Counter ID


Feature ID

Feature Name

3440 A d Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (No Cell Allocation Available)

D-114301

GBFD-114302



1278083441

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.PROTOCL

H352Dp:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Protocol Error Unspecified)

GBFD-114301

GBFD-114302



1278083442

CELL.INTERRAN.OUTCELL.HO.FAIL.MS.RPT.OTHER

H352Dq:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels) (Other Causes)

GBFD-114301

GBFD-114302



1278083443

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.OM.INTERVENTION

H352Ka:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (OM Intervention)

GBFD-114301

GBFD-114302



1278083444

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.EQUIP.FAIL

H352Kb:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover

GBFD-114301

GBFD-



Counter ID


Feature ID

Feature Name

Request Rejected) (Equipment Failure)

114302

1278083445

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.NO.RADIO.RES

H352Kc:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (No Radio Resource Available)

GBFD-114301

GBFD-114302



1278083446

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.REQ.NO.TER.RES

H352Kd:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (Requested Terrestrial Resource Unavailable)

GBFD-114301

GBFD-114302



1278083447

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.BSS.NOT.EQUIP

H352Ke:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (BSS not Equipped)

GBFD-114301

GBFD-114302



1278083448

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.INVAILD.CELL

H352Kf:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (Invalid Cell)

GBFD-114301

GBFD-114302



Counter ID


Feature ID

Feature Name

1278083449

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.REQ.TRANSC.UNAIVL

H352Kg:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (Requested Transcoding/Rate Adaption Unavailable)

GBFD-114301

GBFD-114302



1278083450

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.CIR.POOL.MISMATCH

H352Kh:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (Circuit Pool Mismatch)

GBFD-114301

GBFD-114302



1278083451

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.REQ.NO.SV

H352Ki:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (Requested Speech Version Unavailable)

GBFD-114301

GBFD-114302



1278083452

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.CIPH.ALG.NOT.SUPT

H352Kj:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (Ciphering Algorithm not Supported)

GBFD-114301

GBFD-114302



127808 CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.TER. H352Kk:Faile GBF GSM/

Counter ID


Feature ID

Feature Name

3453 CIR.ALRDY.ALLOC d Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (Terrestrial circuit already allocated)

D-114301

GBFD-114302



1278083454

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.INVAILD.MSG

H352Kl:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (Invalid Message)

GBFD-114301

GBFD-114302



1278083455

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.PROTOCOL.ERR

H352Km:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (Protocol Error between BSS and MSC)

GBFD-114301

GBFD-114302



1278083456

CELL.INTERRAN.OUTCELL.HO.FAIL.HO.REJ.OTHER

H352Kn:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected) (Other Causes)

GBFD-114301

GBFD-114302



1278083457

CELL.INTERRAN.OUTCELL.HO.FAIL.CLR.CMD.RADIO.INTF.MSG.FAIL

H352Ha:Failed Outgoing Inter-RAT Inter-Cell

GBFD-114301


Counter ID


Feature ID

Feature Name

Handovers (Clear Commands Sent By MSC) (Radio Interface Message Failure)

GBFD-114302


1278083458

CELL.INTERRAN.OUTCELL.HO.FAIL.CLR.CMD.RADIO.INTF.FAIL

H352Hb:Failed Outgoing Inter-RAT Inter-Cell Handovers (Clear Commands Sent By MSC) (Radio Interface Failure)

GBFD-114301

GBFD-114302



1278083459

CELL.INTERRAN.OUTCELL.HO.FAIL.CLR.CMD.OM.INTERVENTION

H352Hc:Failed Outgoing Inter-RAT Inter-Cell Handovers (Clear Commands Sent By MSC) (OM Intervention)

GBFD-114301

GBFD-114302



1278083460

CELL.INTERRAN.OUTCELL.HO.FAIL.CLR.CMD.EQUIP.FAIL

H352Hd:Failed Outgoing Inter-RAT Inter-Cell Handovers (Clear Commands Sent By MSC) (Equipment Failure)

GBFD-114301

GBFD-114302



1278083461

CELL.INTERRAN.OUTCELL.HO.FAIL.CLR.CMD.PREEMPTION

H352He:Failed Outgoing Inter-RAT Inter-Cell Handovers (Clear Commands

GBFD-114301

GBFD-1143



Counter ID


Feature ID

Feature Name

Sent By MSC) (Preemption)

02

1278083462

CELL.INTERRAN.OUTCELL.HO.FAIL.CLR.CMD.INVALID.MSG

H352Hf:Failed Outgoing Inter-RAT Inter-Cell Handovers (Clear Commands Sent By MSC) (Invalid Message)

GBFD-114301

GBFD-114302



1278083463

CELL.INTERRAN.OUTCELL.HO.FAIL.CLR.CMD.PROTOCOL.ERR

H352Hg:Failed Outgoing Inter-RAT Inter-Cell Handovers (Clear Commands Sent By MSC) (Protocol Error between BSS and MSC)

GBFD-114301

GBFD-114302



1278083464

CELL.INTERRAN.OUTCELL.HO.FAIL.CLR.CMD.OTHER

H352Hh:Failed Outgoing Inter-RAT Inter-Cell Handovers (Clear Commands Sent By MSC) (Other Causes)

GBFD-114301

GBFD-114302



1278083465

CELL.INTERRAN.OUTCELL.HO.FAIL.A.INTERF.FAIL

H352G:Failed Outgoing Inter-RAT Inter-Cell Handovers (A Interface Failure)

GBFD-114301

GBFD-114302



1278083466

CELL.INTERRAN.OUTCELL.HO.FAIL.T7.EXP H352L:Failed Outgoing Inter-RAT

GBFD-1143

GSM/WCDM

Counter ID


Feature ID

Feature Name

Inter-Cell Handovers (T7 Expired)

01

GBFD-114302

AInteroperability


1278083467

CELL.INTERRAN.OUTCELL.HO.FAIL.T8.EXP H352C:Failed Outgoing Inter-RAT Inter-Cell Handovers (T8 Expired)

GBFD-114301

GBFD-114302



1278083468

CELL.INTERRAN.OUTCELL.HO.REQ CH350:Outgoing Inter-RAT Inter-Cell Handover Requests

GBFD-114301

GBFD-114302



1278083469

CELL.INTERRAN.OUTCELL.HO.SUCC CH353:Successful Outgoing Inter-RAT Inter-Cell Handovers

GBFD-114301

GBFD-114302



1278083470

CELL.INTERRAN.OUTCELL.HO.SUCC.RATE TH353:Success Rate of Outgoing Inter-RAT Inter-Cell Handover

GBFD-114301

GBFD-114302



1278083471

CELL.INTERRAN.OUTCELL.HO.CMD CH351:Outgoing Inter-RAT Inter-Cell Handover Commands

GBFD-114301

GBFD-



Counter ID


Feature ID

Feature Name

114302

1278083472

CELL.INTERRAN.OUTCELL.HO.FAIL CH352:Failed Outgoing Inter-RAT Inter-Cell Handovers

GBFD-114301

GBFD-114302



1278083473

CELL.INTERRAN.OUTCELL.HO.FAIL.RECONN.SUCC

CH352D:Failed Outgoing Inter-RAT Inter-Cell Handovers (Reconnection toOld Channels)

GBFD-114301

GBFD-114302



1278083474

CELL.INTERRAN.OUTCELL.HO.FAIL.REQ.REJ CH352K:Failed Outgoing Inter-RAT Inter-Cell Handovers (Handover Request Rejected)

GBFD-114301

GBFD-114302



1278083475

CELL.INTERRAN.OUTCELL.HO.FAIL.MSC.CLR CH352H:Failed Outgoing Inter-RAT Inter-Cell Handovers (Clear Commands Sent By MSC)

GBFD-114301

GBFD-114302



1278083486

CELL.INTERRAN.OUTCELL.HO.REQ.LOAD.BASED.HO

H350G:Outgoing Inter-RAT Inter-Cell Handover Requests(load based handover)

GBFD-114322


1278083487

CELL.INTERRAN.OUTCELL.HO.CMD.LOAD.BASED.HO

H351G:Outgoing Inter-RAT

GBFD-


Counter ID


Feature ID

Feature Name

Inter-Cell Handover Commands(load based handover)

114322

1278083488

CELL.INTERRAN.OUTCELL.HO.FAIL.TARGETCELL.TRAFLOAD.HIGHER

H352N:Number of Failed Outgoing Inter-RAT Inter-Cell Handovers (Target Cell Traffic Load Higher)

GBFD-114322


1278083489

CELL.INTERRAN.OUTCELL.HO.REQ.SERVICE.BASED.HO

H350M:Outgoing Inter-RAT Inter-Cell Handover Requests(service based handover)

GBFD-114321


1278083490

CELL.INTERRAN.OUTCELL.HO.CMD.SERVICE.BASED.HO

H351M:Outgoing Inter-RAT Inter-Cell Handover Commands(service based handover)

GBFD-114321


1278083491

CELL.INTERRAN.OUTCELL.HO.FAIL.SERVICE.BASED.HO

H352M:Failed Outgoing Inter-RAT Inter-Cell Handovers(service based handover)

GBFD-114321


1278083492

CELL.INTERRAN.OUTCELL.HO.REQ.DR.SD H3500A:Outgoing Inter-RAT Inter-Cell Handover Requests (SDCCH) (Directed Retry)

GBFD-114301

GBFD-114302



127808 CELL.INTERRAN.OUTCELL.HO.CMD.DR.SD H3510A:Outg GBF GSM/

Counter ID


Feature ID

Feature Name

3493 oing Inter-RAT Inter-Cell Handover Commands (SDCCH) (Directed Retry)

D-114301

GBFD-114302



1278083494

CELL.INTERRAN.OUTCELL.HO.FAIL.DR.SD H3520A:Failed Outgoing Inter-RAT Inter-Cell Handovers (SDCCH) (Directed Retry)

GBFD-114301

GBFD-114302



1278699497

BSCRPT.INTERRAN.OUTCELL.HO.FAIL.T8.EXP ZH952C:Successful Reconnections toOld Channels upon Outgoing Inter-RAT Inter-Cell Handover Failure per BSC(T8 Time Out)

GBFD-114301

GBFD-114302



1278699498

BSCRPT.INTERRAN.OUTCELL.HO.FAIL.RECONN.SUCC

ZCH952D:Successful Reconnections toOld Channels upon Outgoing Inter-RAT Inter-Cell Handover Failure per BSC

GBFD-114301

GBFD-114302



13 GlossaryFor the acronyms, abbreviations, terms, and definitions, see the Glossary.

14 Reference Documents[1] 3GPP TS 45.008 Radio subsystem link control

[2] 3GPP TS 44.018 Mobile radio interface layer 3 specification; Radio Resource Control (RRC) protocol

[3] 3GPP TS 48.008 Mobile Switching Centre - Base Station system (MSC-BSS) interface; Layer 3 specification

[4] BSC6900 Feature List

[5] BSC6900 Optional Feature Description

[6] BSC6900 GSM Parameter Reference

[7] BSC6900 GSM MML Command Reference

[8] Idle Mode Behavior Feature Parameter Description

[9] Handover Feature Parameter Description

2G to 3G reselection

Documents

Transcript of 2G to 3G reselection