ETSI
ETSI TR 143 903 V8.3.0 (2009
3GPP TR 43.903 version 8.3.0 Release 8
Contents
Intellectual Property Rights................................................................................................................................2
Foreword.............................................................................................................................................................2
Foreword.............................................................................................................................................................5
Introduction ........................................................................................................................................................5
1 Scope........................................................................................................................................................6
2 References................................................................................................................................................6
3 Definitions, symbols and abbreviations..............................................................................................................7
3.1 Definitions..........................................................................................................................................................7
3.2 Symbols..............................................................................................................................................................8
3.3 Abbreviations .....................................................................................................................................................9
4 Requirements............................................................................................................................................9
5 Overview................................................................................................................................................10
5.1 Background ......................................................................................................................................................10
5.2 Architecture......................................................................................................................................................11
5.2.1 Legacy Architecture....................................................................................................................................11
5.2.2 PCM encoded speech (G.711) over IP........................................................................................................12
5.2.3 Compressed speech over IP........................................................................................................................13
5.2.4 Example Deployment Scenarios.................................................................................................................15
5.3 Functional Impacts ...........................................................................................................................................19
5.3.1 G.711 and compressed speech over IP........................................................................................................19
5.3.2 Support for Data and Fax Services .............................................................................................................20
5.3.3 Functional Impacts for Migration...............................................................................................................20
6 Study Results, User Plane ......................................................................................................................20
6.1 User Plane Principles........................................................................................................................................20
6.1.1 Transport network User Plane for A over IP ..............................................................................................20
6.1.1.1 PCM coded speech (G.711) over IP......................................................................................................20
6.1.1.2 Compressed speech and data/fax over IP..............................................................................................21
6.1.2 Transport network Control Plane for A over IP..........................................................................................21
6.1.3 Potential impact on the Nb and Nc interfaces.............................................................................................21
6.2 Payload Formats...............................................................................................................................................21
6.2.1 Existing TRAU Frames for Speech ............................................................................................................21
6.2.2 RTP profiles for speech ..............................................................................................................................25
6.2.2.1 RTP profiles for G.711 encoded speech on the A over IP interface......................................................25
6.2.2.2 RTP profiles for compressed speech on the A over IP..........................................................................25
6.2.2.3 RTP profiles for compressed speech on Nb interface ...........................................................................26
6.2.3 RTP profiles for data and fax calls .............................................................................................................26
6.2.3.1 RTP profiles for data and fax calls with rate adaptation in BSS ...........................................................26
6.2.3.2 RTP profiles for data and fax calls with rate adaptation in CN.............................................................26
6.3 Transport Layer................................................................................................................................................27
6.3.1 Link Layer and Physical Layer...................................................................................................................27
6.3.2 UDP and IP.................................................................................................................................................27
6.3.3 RTP.............................................................................................................................................................27
6.3.4 RTCP ..........................................................................................................................................................27
6.3.5 IP Multiplexing...........................................................................................................................................27
6.4 Handover Procedure (User Plane)....................................................................................................................28
6.4.1 Alternative 1 ...............................................................................................................................................28
6.4.1.1 General Handover Procedure ................................................................................................................28
6.4.1.2 Intra-BSC Handover to a compatible target cell ...................................................................................28
6.4.1.3 Intra-BSC Handover to an incompatible target cell ..............................................................................28
6.4.1.4 Inter-BSC Handover..............................................................................................................................28
6.4.2 Alternative 2 ...............................................................................................................................................28
6.5 Time Alignment ...............................................................................................................................................28