Content for TR 43.903 Word version: 16.0.0
5 Overview
6 Study Results, User Plane
7 Study Results, Control Plane
8 Informative: Network Design Issues
9 Expected impacts to existing specifications
10 Summary and Conclusion
$ Change History
5 Overview Word‑p. 10
5.1 Background
5.2 Architecture Word‑p. 11
5.2.1 Legacy Architecture
5.2.2 PCM encoded speech (G.711) over IP Word‑p. 12
5.2.3 Compressed speech over IP Word‑p. 13
5.2.4 Example Deployment Scenarios Word‑p. 15
5.3 Functional Impacts Word‑p. 19
6 Study Results, User Plane
6.1 User Plane Principles
6.1.1 Transport network User Plane for A over IP
6.1.2 Transport network Control Plane for A over IP
6.1.3 Potential impact on the Nb and Nc interfaces
6.2 Payload Formats
6.2.1 Existing TRAU Frames for Speech
6.2.2 RTP profiles for speech Word‑p. 25
6.2.2.1 RTP profiles for G.711 encoded speech on the A over IP interface
6.2.2.2 RTP profiles for compressed speech on the A over IP
6.2.2.3 RTP profiles for compressed speech on Nb interface Word‑p. 26
6.2.3 RTP profiles for data and fax calls
6.3 Transport Layer Word‑p. 27
6.4 Handover Procedure (User Plane) Word‑p. 28
6.4.1 Alternative 1
6.4.1.1 General Handover Procedure
6.4.1.2 Intra-BSC Handover to a compatible target cell
6.4.1.3 Intra-BSC Handover to an incompatible target cell
6.4.1.4 Inter-BSC Handover
6.4.2 Alternative 2
6.5 Time Alignment
6.5.1 Introduction
6.5.2 Time Alignment principles Word‑p. 29
6.5.3 Time Alignment performances evaluation Word‑p. 30
6.5.4 Proposed implementation Word‑p. 31
6.5.5 Summary Word‑p. 32
7 Study Results, Control Plane Word‑p. 33
7.1 Control Plane Principles
7.1.1 Exchange of Transport Layer Information
7.1.2 Need for a Call Identifier for IP-based calls Word‑p. 34
7.1.3 Exchange of Codec Information Word‑p. 35
7.1.3.1 Exchange of Codec Information at Call Establishment
7.1.3.2 Exchange of Codec Information at Handover Word‑p. 37
7.1.4 Location of Transcoder Resource in BSS or CN Word‑p. 38
7.1.5 Exchange of RTP Parameters
7.2 Signalling Messages Word‑p. 40
7.2.1 BSSMAP
7.2.1.1 Assignment Request
7.2.1.2 Assignment Complete
7.2.1.3 Handover Required Word‑p. 41
7.2.1.4 Handover Request Word‑p. 42
7.2.1.5 Handover Request Acknowledge Word‑p. 43
7.2.1.6 Handover Performed
7.2.1.7 Complete Layer 3 Information Word‑p. 44
7.2.1.8 BSC-SCL and MSC-PCL
7.2.1.9 Speech Codec (Chosen) Word‑p. 45
7.2.1.10 Speech Codec (Used)
7.2.1.11 Circuit Switched Data Codec (CSD Dummy Codec)
7.2.2 DTAP Word‑p. 46
7.2.3 VGCS/VBS Protocol
7.2.4 H.248 Protocol
7.3 Procedures
7.3.1 Codec Negotiation at Call Setup
7.3.2 Codec Negotiation at Handover Word‑p. 48
7.3.2.1 Intra-BSC Handover to a Compatible Target Cell Word‑p. 49
7.3.2.2 Intra-BSC Handover to an Incompatible Target Cell
7.3.2.3 Inter-BSC Handover Word‑p. 52
7.3.3 Codec Re-Negotiation after Inter-BSC Handover Word‑p. 54
7.4 Impacts on the A Interface Control Plane Word‑p. 56
8 Informative: Network Design Issues Word‑p. 60
9 Expected impacts to existing specifications
10 Summary and Conclusion
$ Change History Word‑p. 62
