Iub satellite transmission

RAN

Iub Satellite Transmission

Issue 01

Date 2009-03-30

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RANIub Satellite Transmission

About This Document

About This Document

AuthorPrepared by ZouRong Date 2009-02-10

Edited by Xin Lichen Date 2009-02-20

Reviewed by Tang Yuanxian, Chen Qucai, Huang Kaitao, Xubin, zhang Xijie, Wu Weiting

Date 2009-02-26

Translated by

Wu Gongbo Date 2009-02-28

Tested by Zhang Xiangning Date 2009-03-13

Approved by Duan Zhongyi Date 2009-03-30

Issue 01 (2009-03-30) Huawei Proprietary and Confidential Copyright © Huawei

Technologies Co., Ltd

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Contents

Contents

1 Change History...........................................................................1-22 Introduction...............................................................................2-23 Technical Description..................................................................3-2

3.1 Structure of Iub Satellite Transmission..........................................................................................................3-23.1.1 Communications Satellite.....................................................................................................................3-23.1.2 Earth Station..........................................................................................................................................3-2

3.2 Networking for Iub Satellite Transmission.....................................................................................................3-23.2.1 Leasing Existing Large Earth Stations..................................................................................................3-23.2.2 Utilizing Existing VSAT Systems.........................................................................................................3-23.2.3 Setting Up New VSAT Systems............................................................................................................3-2

3.3 Bands for Iub Satellite Transmission..............................................................................................................3-23.4 Iub Satellite Transmission Protocol Stack......................................................................................................3-2

4 Iub satellite transmission Parameters..........................................4-24.1 Description.....................................................................................................................................................4-24.2 Values and Ranges..........................................................................................................................................4-2

5 Implementing Iub Satellite Transmission......................................5-25.1 Enabling Iub Satellite Transmission...............................................................................................................5-25.2 Reconfiguring the Iub Satellite Transmission Parameters..............................................................................5-25.3 Disabling Iub Satellite Transmission..............................................................................................................5-2

6 Maintenance Information............................................................6-26.1 Alarms.............................................................................................................................................................6-26.2 Counters..........................................................................................................................................................6-2

7 Reference Documents.................................................................7-2



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7 Reference Documents

1 Change History

The change history provides information on the changes in different document versions.

Document and Product Versions

Table 1-1 Document and product versions

Document Version RAN Version01 (2009-03-30) 11.0

Draft (2009-03-10) 11.0

This document is based on the BSC6810 and 3900 series NodeBs.

The available time of each feature is subject to the RAN product roadmap.

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

Feature change: refers to the change in the Iub satellite transmission feature. Editorial change: refers to the change in the information that was inappropriately

described or the addition of the information that was not described in the earlier version.

01 (2009-03-30)This is the document for the first commercial release of RAN11.0.

Compared with draft (2009-03-10), this issue optimizes the description.

Draft (2009-03-10)This is the draft of the document for RAN11.0.



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2 Introduction

Iub satellite transmission refers to the satellite-based connection on the Iub interface between the RNC and the NodeB. In general, the data between the RNC and the NodeB is transmitted on terrestrial transport networks that can be based on the cable, optical cable, and microwave. In some remote areas, coastal islands, deserts, and uninhabited areas where terrestrial transport networks are unavailable or difficult to deploy, satellite transmission can overcome this difficulty.

Since satellite communication has many benefits such as larger coverage, minor influence by landforms, good mobility for emergency communications, easy link leasing or deployment, and easy bandwidth control, Iub satellite transmission makes the Iub interface easier to deploy.

Satellite communication, however, has demerits such as high costs in equipment and link leasing, and high delay. Therefore, the Iub satellite transmission is recommended only when terrestrial transport is unavailable.

Intended AudienceThis document is intended for:

System operators who need a general understanding of Iub satellite transmission. Personnel working on Huawei products or systems.

Impact Impact on System Performance

− Satellite transmission quality is liable to environmental conditions. Bit errors may lead to bad quality in calls and data services.

− The delay of satellite transmission is higher than that of terrestrial transmission. Satellite transmission usually brings about the Round Trip Time (RTT) in the range of 500 ms to 700 ms. Long delay or RTT may cause slow call connections or voice delay and affect data services.

Impact on Other FeaturesNone.

Network Elements InvolvedTable 2-1 lists the Network Elements (NEs) involved in the Iub satellite transmission.



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Table 2-1 NEs involved in the Iub satellite transmission

UE NodeB

RNC MSC Server

MGW SGSN GGSN HLR

– √ √ – – – – –

NOTE: –: not involved √: involved

UE = User Equipment, RNC = Radio Network Controller, MSC Server = Mobile Service Switching Center Server, MGW = Media Gateway, SGSN = Serving GPRS Support Node, GGSN = Gateway GPRS Support Node, HLR = Home Location Register



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3 Technical Description

This chapter describes the structure, networking, bands, and algorithm about Iub satellite transmission.

Structure of Iub Satellite TransmissionThe structure of Iub satellite transmission consists of the RNC, NodeB, earth station, and communications satellite.

Networking for Iub Satellite TransmissionIn terms of reliability and delay, it is recommended that the star topology be applied to Iub satellite transmission.

Bands for Iub Satellite TransmissionThere are two typical bands for Iub satellite transmission. A proper band should be selected for satellite transmission, depending on climates in different regions.

Iub Satellite Transmission Protocol StackThe Iub satellite transmission algorithm complies with the Iub interface protocol.

3.1 Structure of Iub Satellite TransmissionThe structure of Iub satellite transmission consists of the RNC, NodeB, earth station, and communications satellite.

Figure 3-1 shows the structure of Iub satellite transmission.



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Figure 3-1 Structure of Iub satellite transmission

3.1.1 Communications SatelliteThe communications satellite usually refers to a geosynchronous satellite. The satellite orbits at a distance of 36,000 km from the earth and has an angular orbital velocity equal to the earth orbital velocity.

A communications satellite consists of the control system, communication system (antennas and repeaters), telemeter system, power supply system, and temperature control system.

3.1.2 Earth StationAn earth station consists of the antenna system, transceiver, channel terminal (modem), communication control system, and power supply system.

The earth station can be a large- or small-scale station.

A large-scale earth station, such as a large-scale national or international communication station, uses the large-aperture antenna to transmit high-speed data. A large-scale earth station brings the high cost. User data should be converged on the earth station through terrestrial communication networks before satellite communication.

A small-scale earth station, such as a Very Small Aperture Terminal (VSAT), uses the small-aperture antenna. The equipment features low cost and easy deployment.

3.2 Networking for Iub Satellite TransmissionIn terms of reliability and delay, it is recommended that the star topology be applied to Iub satellite transmission.

Iub transmission links can be set up in the satellite network in three ways.



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3.2.1 Leasing Existing Large Earth StationsIf links provided by the existing earth stations are leased, it is not necessary to take into account the networking for satellite transmission or to manage satellite equipment. Therefore, service launch can be speeded up, but the networking is restricted by the locations of earth stations.

3.2.2 Utilizing Existing VSAT SystemsNew sites are set up in the existing VSAT systems. This saves costs in routine management and maintenance of the VSAT system, but the bandwidth is limited. This way is applicable to small-scale networks.

3.2.3 Setting Up New VSAT SystemsSetting up new VSAT systems enables clear network structures and easy capacity expansion, but it requires heavy investment on a lump-sum basis.

In general, NodeBs in satellite transmission mode are usually deployed in remote areas where there usually might be no large earth stations nearby. In addition, the bandwidth requirement of the remote base station is not very high. Consequently, the VSAT system is a suitable choice. Figure 3-1 shows the VSAT system on the Iub interface.

Figure 3-1 VSAT system on the Iub interface

3.3 Bands for Iub Satellite TransmissionThere are two typical bands for Iub satellite transmission. A proper band should be selected for satellite transmission, depending on climates in different regions.

Table 3-1 describes two typical bands for satellite transmission.

Table 3-1 Bands for satellite transmission

Band Frequency Characteristic

C 3.7 GHz to 4.2 GHz5.925 GHz to 6.425 GHz

Insensitive to atmospheric absorptionInsensitive to rainfall



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Sensitive to the terrestrial microwave communication at the same bandLarge antenna aperture

Ku 11.7 GHz to 12.2 GHz14 GHz to 14.5 GHz

Sensitive to rainfall, snowfall, and fogInsensitive to the terrestrial microwave communication at the same bandSmall antenna apertureFlexible applications

3.4 Iub Satellite Transmission Protocol StackThe Iub satellite transmission algorithm complies with the Iub interface protocol.

Figure 3-1 shows the protocol stack for the Iub interface.

Figure 3-1 Protocol stack for the Iub interface (based on ATM and IP)

Compared with terrestrial transmission, the Round Trip Time (RTT) value on the Iub interface in satellite transmission mode increases by 500 ms to 700 ms. Consequently, the Uu interface RTT value carried on the Iub interface increases by 500 ms to 700 ms. The optimum Uu and Iub parameters should be used in this environment.

If the Iub satellite transmission is enabled, the RNC provides default values of the following parameters for the NodeB using satellite transmission:



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Load Monitor (LDM) and Load Control (LDC) parameters Optimum parameters related to the sliding window size and timer of the RLC at the data

link layer Optimum parameters of the FP transport synchronization timer Optimum activation time of radio links Optimum outer loop power control parameters (to protect voice and data quality from

control hysteresis) Constraining the handover procedure (If the delay variation is out of the soft

combination range during soft handover, only hard handover is allowed.)

If the Iub satellite transmission is disabled, the RNC Prohibits the NodeB using satellite transmission.

The default parameters of the SSCOP/ALCAP/NBAP timers can meet the requirement of satellite transmission. They need not be reconfigured.



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4 Iub satellite transmission Parameters

4.1 DescriptionTable 4-1 Iub satellite transmission parameter description

Parameter ID Description

AmRlcCfgPara This parameter specifies to edit sender parameters, receiver parameters, or flow control parameters.

DELAYCLASSThis parameter specifies the delay class. According to the specification, a maximum of five delay classes, that is, class 1 to class 5, are available. The five classes do not overlap each other.

OppositeTrchType This parameter specifies the type of transport channel at the peer end for the typical RAB. For CS services, this parameter must be set to TRCH_DCH.

RABINDEX This parameter specifies the index number that identifies the configuration of a typical RAB.

RlcMode

This parameter specifies the work mode of RLC entity.- AM: Acknowledged Mode. Automatic Repeat Request (ARQ) is used in error correction.- UM: Unacknowledged Mode. Retransmission is not applied. According to the configuration, the data with errors is discarded or marked.- TM: Transparent Mode. No protocol overhead is added to the higher-layer data. The protocol data units with errors may be discarded or marked.For details of this parameter, refer to the 3GPP TS 25.322.

TRCHTYPE This parameter specifies the type of transport channel.



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4.2 Values and RangesTable 4-1 Iub satellite transmission parameter values and parameter ranges

Parameter ID

Default Value

GUI Value Range

Actual Value Range

Unit MML Command NE

AmRlcCfgPara -

SENDER_PARA, RECEIVE_PARA, FLOWCONTROL_PARA

SENDER_PARA, RECEIVE_PARA, FLOWCONTROL_PARA

None ADD TYPRABRLC(Mandatory) RNC

DELAYCLASS - 1~5 1~5 None

ADD TYPRABOLPC(Mandatory)ADD TYPRABRLC(Mandatory)

RNC

OppositeTrchType -

TRCH_DCH, TRCH_HSDSCH

TRCH_DCH, TRCH_HSDSCH

None ADD TYPRABRLC(Mandatory) RNC

RABINDEX - 0~99 0~99 None

ADD TYPRABOLPC(Mandatory) ADD TYPRABDCCCMC(Mandatory) ADD TYPRABRLC(Mandatory) ADD TYPRABHSPA(Mandatory) ADD TYPRABBASIC(Mandatory) ADD TYPRABQUALITYMEAS(Mandatory)

RNC

RlcMode - AM, UM, TM AM, UM, TM None ADD TYPRABRLC(Mandatory) RNC

TRCHTYPE -

TRCH_HSDSCH, TRCH_EDCH_2MS, TRCH_EDCH_10MS

TRCH_HSDSCH, TRCH_EDCH_2MS, TRCH_EDCH_10MS

None ADD TYPRABHSPA(Mandatory) RNC

The Default Value column is valid for only the optional parameters.The "-" symbol indicates no default value.



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5 Implementing Iub Satellite Transmission

This chapter describes how to enable and disable Iub satellite transmission and how to reconfigure the Iub satellite transmission parameters.

Enabling Iub Satellite TransmissionThis section describes how to enable Iub satellite transmission through the satellite equipment installation and some MML commands.

Reconfiguring the Iub Satellite Transmission ParametersThis section describes how to reconfigure the Iub satellite transmission parameters through the MML commands.

Disabling Iub Satellite TransmissionThis section describes how to disable Iub satellite transmission through the MML commands.

5.1 Enabling Iub Satellite TransmissionThis section describes how to enable Iub satellite transmission through the satellite equipment installation and some MML commands.

Enabling Iub Satellite Transmission Configure transport layer data according to the terrestrial transmission status. Run the ADD NODEB command to add a NodeB. Set the value of IUB Trans

Delay[ms], and set Satellite Trans Ind to TRUE.

Verifying the Enabled Feature Make calls on satellite-based NodeBs.



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5.2 Reconfiguring the Iub Satellite Transmission Parameters

This section describes how to reconfigure the Iub satellite transmission parameters through the MML commands.

The Load Monitor (LDM) parameters and the Load Control (LDC) parameters can either be set by default or be manually reconfigured through the MML commands.

Procedure Run the SET SATLDM command to reconfigure the Load Monitor (LDM) parameters. Run the SET SATLDCPERIOD command to reconfigure the Load Control (LDC)

parameters.

5.3 Disabling Iub Satellite TransmissionThis section describes how to disable Iub satellite transmission through the MML commands.

ProcedureThere are two ways to disable Iub satellite transmission.

Run the MOD NODEB command to set Satellite Trans Ind to FALSE. Remove the concerned NodeBs.



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6 Maintenance Information

The following describes the alarms and counters related to Iub satellite transmission.

6.1 AlarmsNone.

6.2 CountersNone.



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The following lists the reference documents related to Iub satellite transmission.

1. 3GPP TS 25.402: "Synchronization in UTRAN, Stage 2"2. 3GPP TS 25.430: "UTRAN Iub Interface: General Aspects and Principles"3. 3GPP TS 25.431: "UTRAN Iub Interface: Layer 1"4. 3GPP TS 25.432: "UTRAN Iub Interface: Signalling Transport"5. 3GPP TS 25.433: "NBAP Specification"6. 3GPP TS 25.434: "UTRAN Iub Interface: Data Transport & Transport Signalling for

Common Transport Channel Data Streams"7. 3GPP TS 25.435: "UTRAN Iub Interface: User Plane Protocols for Common Transport

Channel Data Streams"8. 3GPP TS 25.426: "UTRAN Iur/Iub Interface: Data Transport & Transport Signalling for

DCH Data Streams"9. 3GPP TS 25.427: "UTRAN Iur/Iub Interface: User Plane Protocol for DCH Data

Streams"10. 3GPP TS 25.322: "Radio Link Control (RLC) Protocol Specification"11. ITU-T Recommendation Q.2110 (07/94): "B-ISDN ATM adaptation layer – Service

specific connection oriented protocol (SSCOP)"12. Basic Feature Description of Huawei UMTS RAN11.0 V1.513. Optional Feature Description of Huawei UMTS RAN11.0 V1.5



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