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Ater Compression Transmission Feature Parameter Description Copyright © Huawei Technologies Co., Ltd. 2010. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders. Notice The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute the warranty of any kind, express or implied. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

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  • Ater Compression Transmission Feature Parameter Description

    Copyright Huawei Technologies Co., Ltd. 2010. All rights reserved.

    No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

    Trademarks and Permissions

    and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

    All other trademarks and trade names mentioned in this document are the property of their respective holders.

    Notice

    The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute the warranty of any kind, express or implied.

    Huawei Proprietary and Confidential Copyright Huawei Technologies Co., Ltd.

  • BSS Ater Compression Transmission Contents

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    Contents 1 Introduction to This Document .............................................................................................1-1

    1.1 Scope ............................................................................................................................................ 1-1 1.2 Intended Audience ........................................................................................................................ 1-1 1.3 Change History.............................................................................................................................. 1-1

    2 Overview .....................................................................................................................................2-1

    3 Technical Description ..............................................................................................................3-1 3.1 Network Topologies ....................................................................................................................... 3-1

    3.1.1 Network Topology in Non-TC Pool Mode ............................................................................. 3-1 3.1.2 Network Topology in TC Pool Mode ..................................................................................... 3-1

    3.2 Technologies in Ater Compression Transmission ......................................................................... 3-3 3.2.1 Speech Frame Processing ................................................................................................... 3-3 3.2.2 Packet Multiplexing............................................................................................................... 3-5 3.2.3 Reliability .............................................................................................................................. 3-5

    4 Engineering Guidelines...........................................................................................................4-1

    5 Parameters .................................................................................................................................5-1

    6 Counters......................................................................................................................................6-1

    7 Glossary ......................................................................................................................................7-1

    8 Reference Documents .............................................................................................................8-1

  • BSS Ater Compression Transmission 1 Introduction to This Document

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    1 Introduction to This Document 1.1 Scope This document describes the network topologies on the Ater interface and the technologies in Ater compression transmission.

    1.2 Intended Audience It is assumed that users of this document are familiar with GSM basics and have a working knowledge of GSM telecommunication.

    This document is intended for:

    z Personnel working on Huawei GSM products or systems z System operators who need a general understanding of this feature

    1.3 Change History The change history provides information on the changes between different document versions.

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

    z Feature change Feature change refers to the change in the Ater compression transmission feature of a specific product version.

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

    Document Issues The document issues are as follows:

    z 02(2009-09-30) z 01(2009-06-30)

    02(2009-09-30) This is the second commercial release of GBSS9.0.

    Compared with issue 01 (2009-06-30), issue 02 (2009-09-30) incorporates the changes described in the following table.

    Change Type

    Change Description Parameter Change

    Feature change

    None. None.

    Editorial change

    The structure of the document is optimized.

    None.

  • 1 Introduction to This Document BSS

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    Issue 02 (2009-09-30)

    01(2009-06-30) This is the first commercial release of GBSS9.0.

  • BSS Ater Compression Transmission 2 Overview

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    2 Overview Ater Compression Transmission is a technology in which the TransCoder Subrack (TCS) of the BSC is located remotely and the IP over PPP over Ch-STM-1 transmission mode is used to carry signals when the Ater interface is in TDM transmission mode. Meanwhile, the techniques such as Ater MUX, PPP MUX, and IP header compression are used for data compression on the Ater interface to increase the transmission efficiency on the Ater interface.

    Ater Compression Transmission has the following features:

    z The remote location of the TCS can save the transmission bandwidth by 75%. After the Ater compression transmission function is enabled, an additional 30% transmission bandwidth on the Ater interface can be saved.

    z IP over PPP enables the IP packets to be transmitted over the traditional TDM network. This protects the legacy investment of the operator who owns the TDM transmission resources.

    z If the Abis interface uses the IP/HDLC transmission mode, the Ater compression transmission function does not require a coding/decoding board to convert the Transcoder & Adaptor Unit (TRAU) speech frames to packets. This saves the cost of board configuration.

  • BSS Ater Compression Transmission 3 Technical Description

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    3 Technical Description About This Chapter The TRAU frames are used to carry speech signals in a TDM network; packet TRAU (pTRAU) frames are used to carry signals in IP/HDLC transmission mode.

    When the Ater compression transmission function is enabled, IP over PPP is used for data transmission. The Ater compression transmission is applied only to the speech signals over the Ater interface whereas the signaling and OM signals are still transmitted in TDM mode.

    To enable the Ater compression transmission function, set Ater Interface Transfer Mode to IP.

    3.1 Network Topologies 3.1.1 Network Topology in Non-TC Pool Mode In the network topology in non-TC pool mode, the speech services between the MPS(Main Processing Subrack)/EPS(Extended Processing Subrack) and the TCS of a BSC are carried in IP over PPP over Ch-STM-1 mode, as shown in Figure 3-1.

    Figure 3-1 Network topology in non-TC pool mode

    In Ater compression transmission mode, the MPS/EPS (regarded as the BSC) and TCS are adjacent nodes to each other.

    You need to configure the adjacent BSC of the TCS by setting Adjacent Node Type to BSC(Ater Interface on BSC) and BSC ID to 0. Meanwhile, configure the adjacent TCS of the BSC by setting Adjacent Node Type to TC(Ater Interface on TC).

    3.1.2 Network Topology in TC Pool Mode Figure 3-2 shows the network topology in TC pool mode when the user plane on the Ater interface is in IP over PPP mode.

  • 3 Technical Description BSS

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    Figure 3-2 Network topology in TC pool mode (IP over PPP on the Ater user plane)

    Figure 3-3 shows the network topology when both TDM and IP over PPP are used on the user plane of the Ater interface.

    Figure 3-3 Network topology in TC pool mode (TDM and IP over PPP on the Ater user plane)

  • BSS Ater Compression Transmission 3 Technical Description

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    In the network topology in TC pool mode, the MPS/EPS (regarded as the BSC) and TCS that support Ater compression transmission are adjacent nodes.

    You need to configure all the BSCs in the TC pool as the adjacent nodes of the TCS by setting Adjacent Node Type of each BSC to BSC(Ater Interface on BSC) and setting BSC ID of the primary BSC to 0 and BSC ID of every secondary BSC to a non-zero value. Meanwhile, configure the adjacent TCS of each BSC by setting Adjacent Node Type to TC(Ater Interface on TC).

    3.2 Technologies in Ater Compression Transmission 3.2.1 Speech Frame Processing The timeslots on the Ater interface consist of timeslots for the Ater signaling link, timeslots for the Ater OML, timeslots for the Ater speech service, and timeslots for the A SS7 signaling link. On the Ater interface, the IP over PPP mode is used to carry speech signals whereas the TDM mode is retained to carry signaling and OM signals. Figure 3-4 shows the timeslots on the Ater interface.

    Figure 3-4 Timeslots on the Ater interface

    In Ater compression transmission mode, the speech signals can be processed in the following ways:

    z Direct transmission of pTRAU frames from the Abis interface board to the Ater interface board When the Abis interface uses the HDLC or IP transmission mode, the pTRAU frames are directly sent from the Abis interface board to the Ater interface board without further processing of the DPUc board. This reduces the delay of frame processing. Figure 3-5 shows the signal flow.

  • 3 Technical Description BSS

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    Figure 3-5 Signal flow in the MPS/EPS (Abis over HDLC/IP)

    z Frame format conversion between the Abis interface board and the Ater interface board When the Abis interface uses the TDM transmission mode, the DPUc board in the MPS/EPS processes the TRAU frames on the Abis interface and the pTRAU frames on the Ater interface. In addition, the DPUc board can eliminate the jitter and delay in packet arrival when IP/HDLC transmission is used on the Ater interface. Figure 3-6 shows the signal flow.

    Figure 3-6 Signal flow in the MPS/EPS (Abis over TDM)

    z Frame format conversion between the Ater interface board and the A interface board In Ater compression transmission mode, the Ater interface board sends the pTRAU frames to the DPUc board for converting the pTRAU frames to PCM frames used on the A interface. In addition, the DPUc board can eliminate the jitter and delay in packet arrival when IP/HDLC transmission is used on the Ater interface, support the downlink DTX function, and compress the silence frames. This improves the transmission efficiency on the Ater interface. Figure 3-7 shows the signal flow.

  • BSS Ater Compression Transmission 3 Technical Description

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    Figure 3-7 Signal flow in the TCS

    3.2.2 Packet Multiplexing In Ater compression transmission mode, the POUc board works as the Ater interface board in the MPS/EPS/TCS and supports the following packet multiplexing functions:

    z Ater multiplexing The speech signals on the Ater interface are encapsulated in the same format of pTRAU frames used on the Abis interface. Multiple pTRAU frames are multiplexed into a UDP packet through the Frame Protocol (FP) multiplexing technology, thus improving the transmission efficiency.

    z IP header compression The UDP/IP header can be compressed to decrease the packet header overhead, reduce the packet loss, and shorten the period of packet response.

    z PPP multiplexing Multiple pTRAU frames are multiplexed into a PPP packet to decrease the packet header overhead and thus improve the transmission efficiency.

    Packet multiplexing can greatly improve the transmission efficiency in Ater compression transmission mode when the timeslot resources are limited.

    For details of packet multiplexing, see IP Transport Architecture Description.

    3.2.3 Reliability Ater Compression Transmission can improve transmission resource utilization; however, due to the inherent characteristics of IP transmission, more bit errors, jitter, and delay are generated. In addition, IP transmission has more protocol layers than TDM transmission, thus higher reliability is required.

    Ater Compression Transmission provides high reliability at the physical layer and the data link layer.

    z At the physical layer, the active/standby switchover is performed without disrupting services in the case of board fault or optical port fault.

    z At the data link layer, the MLPPP (Multilink PPP) group is configured to achieve PPP link redundancy.

    In the case of TC fault, the TC pool function can be enabled.

  • BSS Ater Compression Transmission 4 Engineering Guidelines

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    4 Engineering Guidelines z If the core network supports IP transmission, the A over IP mode is recommended. z If the core network does not support IP transmission and the Abis interface uses IP/HDLC

    transmission, then the use of IP transmission on the Ater interface can save the cost of board configuration and Ater transmission resources. Hardware upgrade is required to implement IP transmission on the Ater interface.

    z If the Abis interface uses TDM transmission but the Ater interface uses IP transmission, the configuration cost is increased and the speech quality is degraded. In this case, Ater Compression Transmission is not recommended.

    z When the Ater interface uses IP transmission, the Abis and Ater interfaces can be configured with the same type of interface board to save transmission resources.

  • BSS Ater Compression Transmission 5 Parameters

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    5 Parameters This chapter describes the parameters related to Ater compression transmission.

    For the meaning of each parameter, see Table 5-1. For the default value, value ranges, and MML commands of each parameter, see Table 5-2.

    Table 5-1 Parameter description (1)

    Parameter Description

    Ater Interface Transfer Mode

    Transport mode of the Ater interface. The Ater interface can be in TDM or in IP transport mode.

    Adjacent Node Type Adjacent node type

    BSC ID Unique ID of one BSC in the TC POOL scenario

    Table 5-2 Parameter description (2)

    Parameter Default Value

    GUI Value Range

    Actual Value Range

    Unit

    MML Command

    Impact

    Ater Interface Transfer Mode TDM

    TDM(TDM), IP(IP) TDM, IP

    None

    SET BSCBASIC(Mandatory)

    BSC6900

  • 5 Parameters BSS

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    Parameter Defau GUI Value Actual Un MML Impaclt Value

    Range Value Range

    it Com t mand

    Adjacent Node Type None

    IUB(Iub Interface), IUR(Iur Interface), IUCS(Iu-CS Interface), IUPS(Iu-PS Interface), UNI_AAL2SWITCH(the adjacent node of the ATM switch on the Iub interface), NNI_AAL2SWITCH(the adjacent node of ATM switch on Iur or Iu-CS interface), ABIS(Abis Interface), A(A Interface), BSC(Ater Interface on BSC), TC(Ater Interface on TC)

    IUB, IUR, IUCS, IUPS, UNI_AAL2SWITCH, NNI_AAL2SWITCH, ABIS, A, BSC, TC

    None

    ADD ADJNODE(Mandatory)

    Adjacent node

    BSC ID None 0~15 0~15 None

    ADD ADJNODE(Mandatory)

    Adjacent node

  • BSS Ater Compression Transmission 6 Counters

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    6 Counters None.

  • BSS Ater Compression Transmission 7 Glossary

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    7 Glossary For the acronyms, abbreviations, terms, and definitions, see the Glossary.

  • BSS Ater Compression Transmission 8 Reference Documents

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    8 Reference Documents z RFC1661: The Point-to-Point Protocol (PPP) z RFC1990: The PPP Multilink Protocol (ML-PPP) z RFC 2686: The Multi-Class Extension to Multi-Link PPP z RFC 3153: PPP Multiplexing z BSC6900 Feature List z BSC6900 Optional Feature Description z GBSS Reconfiguration Guide z BSC6900 GSM Parameter Reference z BSC6900 GSM MML Command Reference

    1 Introduction to This Document 1.1 Scope 1.2 Intended Audience 1.3 Change History 2 Overview 3 Technical Description 3.1 Network Topologies 3.1.1 Network Topology in Non-TC Pool Mode 3.1.2 Network Topology in TC Pool Mode

    3.2 Technologies in Ater Compression Transmission 3.2.1 Speech Frame Processing 3.2.2 Packet Multiplexing 3.2.3 Reliability

    4 Engineering Guidelines 5 Parameters 6 Counters 7 Glossary 8 Reference Documents