ZGO-03!02!013 Dynamic FRHR Adjustment_FG_20101030

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ZGO-03-02-013 Dynamic

FR/HR Adjustment

Feature Guide


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ZGO-03-02-013 Dynamic FR/HR Adjustment

ZTE Confidential Proprietary 2010 ZTE CORPORATION. All rights reserved. I


Version Date Author Approved By Remarks

V1.00 2010-10-30 Not open to the Third Party

2010 ZTE Corporation. All rights reserved.

ZTE CONFIDENTIAL:This document contains proprietary information of ZTE and is not to bedisclosed or used without the prior written permission of ZTE.

Due to update and improvement of ZTE products and technologies, information in this document issubjected to change without notice.


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ZTE Confidential Proprietary 2010 ZTE CORPORATION. All rights reserved. II

TABLE OF CONTENTS

1

Feature Attribute ............................................................................................. 1

2

Overview ......................................................................................................... 1

2.1

Feature Introduction .......................................................................................... 1

2.2

Correlation with Other Features ........................................................................ 2

3

Technical Description .................................................................................... 2

3.1

Basic Principle .................................................................................................. 3

3.1.1

Based on cell load ............................................................................................ 3

3.1.2

Based on quality trigger .................................................................................... 3

3.2

Principle Elaboration ......................................................................................... 3

3.2.1

Based on cell load ............................................................................................ 3

3.2.2

Based on quality triger ...................................................................................... 4

4

Parameters and Configurations..................................................................... 5

4.1

Parameter List .................................................................................................. 5

4.2

Parameter Configuration ................................................................................... 5

5

Related Counters and Alarms ...................................................................... 12

5.1

Related Counters ............................................................................................ 12

5.2

Related Alarms ............................................................................................... 12

6

Engineering Guide ........................................................................................ 13

6.1

Application Scenario ....................................................................................... 13

6.2

Configuration Description................................................................................ 13

6.3

Network Impact ............................................................................................... 13

7

Abbreviation .................................................................................................. 13

8

Reference Document .................................................................................... 13


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ZTE Confidential Proprietary 2010 ZTE CORPORATION. All rights reserved. III

FIGURES

Figure 4-1 Configuration for support Dynamic Fr/Hr Adjustment .......................................... 6

Figure 4-2 Parameter configuration for handover controlling ................................................ 7

TABLES

Table 4-1 Parameter List ...................................................................................................... 5

Table 4-2 FRTHRHOSupport ............................................................................................... 7

Table 4-3 AmrFrHoLoadThr ................................................................................................. 8

Table 4-4 FrHoLoadThr ........................................................................................................ 8

Table 4-5 FrOrAmrFrHoQuaThr ........................................................................................... 9

Table 4-6 HrHoQuaThr ........................................................................................................ 9

Table 4-7 AmrHrHoQuaThr ................................................................................................ 10

Table 4-8 LoadAndQualHoP .............................................................................................. 11

Table 4-9 LoadAndQualHoN .............................................................................................. 11

Table 5-1 Counters ............................................................................................................ 12


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ZTE Confidential Proprietary 2010 ZTE CORPORATION. All rights reserved. II

Document

Title


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ZTE Confidential Proprietary 2010 ZTE CORPORATION. All rights reserved. 1

1 Feature Attribute

iBSC Version: [ZXG10 iBSC V6.20]

BTS Version: [ZXG10 BTS V6.20, irrelevant to BTS hardware platform]

Property: [Optional]

Related Network Element:

NE Name Related or Not Special Requirements

MS -

BTS

BSC

MSC -

MGW -

SGSN -

GGSN -

HLR -

Dependent Function: [None]

Exclusive Function: [None]

Note: [None]

2 Overview

2.1 Feature Introduction

With the development of mobile communication services, how to optimize the radio

resource, and how to improve the wireless utilization efficiency under the limited

spectrum resources, while improving the network call quality, and thus correspondingly


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increasing the consumer satisfaction is becoming more and more important. Based on

the above background, HR/FR or AMR HR/AMR FR adjustment function is generated.

The demand required to achieve FR/HR call conversion, and AMR FR/AMR HR

transformation, and then achieving a balance between the system capacity and the voice

quality. When the cell load is high, and if the wireless quality is good, then FR can be

converted into HR, or AMR FR can be converted into AMR HR, which can increase

system capacity while ensuring the call quality. When the wireless quality is poor, then

HR can be converted into FR or AMR HR can be converted into AMR FR, thus ensuring

the normal call.

2.2 Correlation with Other Features

This feature is functionally related to the following feature: ZGO-05-05-004 Abis

Triggered FR/HR Adaptation. Please refer to this feature for detailed relation.

3 Technical Description

The FR / HR dynamic adjustment is achieved mainly based on two parts: the cell load

adjustment and the quality trigger.

FR

AMR FR

HR

AMR HR

Bad Quality

High Load Good Quality


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3.1 Basic Principle

3.1.1 Based on cell load

In order to get more channel resources, when cell load reached a certain level, which is

more than the load handover threshold from AMR FR to AMR HR, then it can select the

appropriate handover initiated from AMR FR call to AMR HR.

If the load continues to ratchet up over the handover load threshold from FR to HR, and if

no suitable AMR FR calls can handover to AMR HR, then it can continue to select

suitable FR call to initiate the handover from FR to HR, thus can improve the systemcapacity

3.1.2 Based on quality trigger

In order to improve voice call quality, when the quality below a certain threshold, then it

can launch the intra-cell handover to access better channel resources to get better voice

quality.

The specific decision process can be put on the handover decision office, if the original

handover conditions are not met, then for the HR and AMR HR call, it needs to continue

to determine the voice quality. If the HR call voice quality meets the requirement of

handover from HR to FR, then the handover from HR to FR can be initiated. And if AMR

HR call voice quality meets the requirement of handover from AMR HR to AMR FR, and

then the handover from AMR HR to AMR FR can be initiated

3.2 Principle Elaboration

3.2.1 Based on cell load

The cell load is calculated as follows:

LOAD = the number of busy channels in the cell * 100 / (the number of busy channels in

the cell+ the number of free channels in the cell)


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The cell load is calculated for each channel applications. When cell load is more than the

handover threshold from AMR FR to AMR HR, then it sends a message

EV_AMRFRHOENABLE to notify the service process. Similarly, when cell load is more

than the handover threshold from FR to HR, then it sends a message EV_FRHOENABLE

to notify the service process.

when service process received the above message, it needs to select the handover call

candidate, and then select a call to handover by considering the voice call quality: (a)

when service process received EV_AMRFRHOENABLE or EV_FRHOENABLE message,

it can select a AMR FR call as the handover candidate from the existing calls of a cell,

and the voice quality of this call must meet the threshold requirements. (b) If the received

message is EV_FRHOENABLE, but no suitable AMR FR call can be found, then it can

continue to select a FR call as the handover candidate. And similarly, the voice quality of

this call must meet the threshold requirements. (C) A message only trigger a call to

handover.

The decision process of deciding whether the voice quality is higher than the handover

threshold is as follows : If there are a number of LoadAndQualHoP values in a continuous

number of LoadAndQualHoN values, whose signal quality are less than the handover

threshold FrOrAmrFrHoQuaThr (the voice quality is described by the bit error rate, so it

should be lower than the threshold to show the better quality), then it can be considered

as satisfying the handover conditions, and so it can be handover candidates.

3.2.2 Based on quality triger

Decision process is like as others:

1. For HR call, if there are LoadAndQualHoP values of continuous

LoadAndQualHoP signal values, whose qualities are higher than

HrHoQuaThr(Quality is described by the bit error rate, so quality is bad when its

value is higher than threshold),,then it is considered as satisfying the handover

conditions and can be used as handover candidate.

2. For AMR HR call, if there are LoadAndQualHoP values of continuous of

LoadAndQualHoP signal values, whose qualities are higher than AmrHoQuaThr

(Quality is described by the bit error rate, so quality is bad when its value is higher


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than threshold), then it is considered as satisfying the handover conditions and can

be used as handover candidate.

4 Parameters and Configurations

4.1 Parameter List

Table 4-1 Parameter List

SN Name Figure

1 FRTHRHOSupport Figure 1

2 AmrFrHoLoadThr Figure 2

3 FrHoLoadThr Figure 2

4 FrOrAmrFrHoQuaThr Figure 2

5 HrHoQuaThr Figure 2

6 AmrHrHoQuaThr Figure 2

7 LoadAndQualHoP Figure 2

8 LoadAndQualHoN Figure 2

4.2 Parameter Configuration

1. Open the handover function between FR/AMR FR and HR/AMR HR

In the configuration resource tree window, double-click [OMC GERAN Subnetwork

user ID BSC Manage network Element user ID Config Set ID BSCGlobal resource

ID BTS Config BTS ID Cell ID]. In [Basic Parameter 2] page in pop item [Cell]

window, Set the parameter supporting handover between FR/AMR FR and HR/AMR HR

yes, Opening this function is OK, Config Interface is as the following Figure 4-1.


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Figure 4-1 Configuration for support Dynamic Fr/Hr Adjustment

2. R dynamic handover controlling parameters

In the configuration resource tree window, double-click [OMC GERAN Subnetwork

user ID BSC Manage network Element user ID Config Set ID BSCGlobal resourceID BTS Config BTS ID CellIDHandover Control 1]. In [Handover Control] page

in pop item [Handover Control 1] window, set the Handover Control parameters, Config

Interface is as the following Figure 4-2.


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Figure 4-2 Parameter configuration for handover controlling

Table 4-2 FRTHRHOSupport

Full name If support handover between AMR FR/ FR and AMR HR/HR

Abbreviation FRTHRHOSupport

3GPP name

3GPP reference

Description

Power control is performed at BTS side and BSC implements

relevant performance statistics. BTS uses this parameter to decide

the periodicity to send the preprocessed power measurement to

BSC as an input for power control analysis. This parameter is in

the unit of SACCH multi-frame.

Managed object Cell

Value range 1 ~ 254

Unit SACCH multiframe

Default value 240

Related features ZGO-04-02-001 Dynamic BTS Power Control

Related

parameters


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Related

interfaces

Table 4-3 AmrFrHoLoadThr

Full name The load of HO from AMR FR to AMR HR

Abbreviation AmrFrHoLoadThr

3GPP name

3GPP reference

Description

When the load of the cell reaches a certain level, it needs to initiate

handover from AMR FR to AMR HR to get more channel

resources, promote system capacity. Parameter is specified to

initiate the load threshold of the handover from AMR FR to AMR

HR.

Managed object Handover control

Value range 20~100

Unit percentage

Default value 80

Related features Handover based on load and quality between FR and HR

Related

parameters

Related

interfaces

Table 4-4 FrHoLoadThr

Full name The load of HO from FR to HR

Abbreviation FrHoLoadThr

3GPP name

3GPP reference

Description


handover from FR to HR to get more channel resources, promote

system capacity. Parameter is specified to initiate the load

threshold of the handover from FR to HR.


Value range 20~100


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Unit percentage

Default value 90


Related

parameters

Related

interfaces

Table 4-5 FrOrAmrFrHoQuaThr

Full name The quality of HO from FR/AMR FR to HR/AMR HR

Abbreviation FrOrAmrFrHoQuaThr

3GPP name

3GPP reference

Description


handover from FR/AMR FR to HR/AMR HR to get more channel


initiate the load threshold of the handover from FR/AMR FR to

HR/AMR HR.


Value range 0~7

Unit

Default value 240


Related

parameters

Related

interfaces

Table 4-6 HrHoQuaThr

Full name The quality of HO from HR to FR

Abbreviation HrHoQuaThr

3GPP name

3GPP reference


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Description


handover from HR to FR to get more channel resources, promote

system capacity. Parameter is specified to initiate the load

threshold of the handover from HR to FR.


Value range 0 ~ 7

Unit

Default value 3


Related

parameters

Related

interfaces

Table 4-7 AmrHrHoQuaThr

Full name The quality of HO from AMR HR to AMR FR

Abbreviation AmrHrHoQuaThr

3GPP name

3GPP reference

Description


handover from AMR HR to AMR FR to get more channel


initiate the load threshold of the handover from AMR HR to AMR

FR.


Value range 0~7

Unit

Default value 3


Related

parameters

Related

interfaces


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Table 4-8 LoadAndQualHoP

Full name P value of load and quality handover

Abbreviation LoadAndQualHoP

3GPP name

3GPP reference

Description

For handover based on load and quality between FR and HR, if P

in the recent signal quality average value of N meets threshold

requirements, then it will initiate handover.

Managed object Handover

Value range 1 ~ 31

Unit

Default value 4


Related

parameters

Related

interfaces

Table 4-9 LoadAndQualHoN

Full name N value of load and quality handover

Abbreviation LoadAndQualHoN

3GPP name

3GPP reference

Description

For handover based on load and quality between FR and HR, if P

in the recent signal quality average value of N meets threshold

requirements, then it will initiate handover.

Managed object handover

Value range 1 ~31

Unit

Default value 3


Related

parameters


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Related

interfaces

5 Related Counters and Alarms

5.1 Related Counters

Table 5-1 Counters

Counter ID What It Counts

C100500214 Average of idle TCH/Fs with interference band 0

C100500215 Average number of idle TCHs/H of interference band 0

C100500216 Average of idle SDCCHs with interference band 0










5.2 Related Alarms

This feature has not related alarms.


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6 Engineering Guide

6.1 Application Scenario

This feature enhances system capacity and call quality, applicable to all scenarios.

6.2 Configuration Description

This feature does not involve any adjustment on iBSC or BTS hardware configuration.

6.3 Network Impact

This feature helps to relieve the network congestion, enhance system capacity and

guarantee call quality. But it may increase the number of handovers.

7 Abbreviation

8 Reference Document

[None]

ZGO-03!02!013 Dynamic FRHR Adjustment_FG_20101030

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