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Content for  TS 48.103  Word version:  16.0.0

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1  ScopeWord‑p. 5

The present document specifies the User Plane data transport protocols used between BSSs and the Core Network (MGWs) across the A interface. The main purpose of the present document is the AoIP description, however for the sake of completeness the AoTDM case is described as well.
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Figure 1.1: CS core network logical architecture
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Note that the present document does not preclude any Core Network Session Control Protocol implementation (BICC or SIP-I).

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
RFC 791:  "Internet Protocol (IP)".
[3]
RFC 2460:  "Internet Protocol, Version 6 (IPv6)".
[4]
RFC 768:  "User Datagram Protocol. (UDP)".
[5]
RFC 3550:  "RTP: A Transport Protocol for Real Time Applications".
[6]
TS 29.414: "Core network Nb Interface data transport and transport signalling".
[7]
RFC 3551:  "RTP Profile for Audio and Video Conference with Minimal Control".
[8]
TR 29.814: "Feasibility Study on Bandwidth Savings at Nb Interface with IP transport".
[9]
RFC 4040:  "RTP Payload Format for a 64 kbits/s Transparent Call"
[10]
RFC 4867:  "RTP Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs"
[11]
RFC 2198:  "RTP Payload for redundant Audio Data"
[12]
TR 43.903: A-Interface over IP Study (AINTIP)
[13]
TS 48.001: "Base Station System - Mobile-services Switching Centre (BSS - MSC) interface; General aspects"
[14]
ITU-T Recommendation G.705: "Characteristics of plesiochronous digital hierarchy (PDH) equipment functional blocks".
[15]
ANSI T1.102-1993: "Digital Hierarchy - Electrical Interface".
[16]
ITU-T Recommendation G.711: "Pulse Code Modulation (PCM) of voice frequencies".
[17]
TS 48.020: "Rate adaption on the Base Station System - Mobile-services Switching Centre (BSS - MSC) interface".
[18]
RFC 5993  (2010) "RTP Payload Format for Global System for Mobile Communications Half Rate (GSM-HR)".
[19]
TS 48.008: "Mobile Switching Centre - Base Station System (MSC-BSS) interface; Layer 3 specification".
[20]
TS 26.102: "Adaptive Multi-Rate (AMR) speech codec; Interface to Iu, Uu and Nb".
[21]
TS 23.284: "Local Call Local Switch; Stage 2".
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3  Definitions, symbols and abbreviationsWord‑p. 6

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply.
Intra-BSS call:
A mobile to mobile voice call involving two mobile stations connected to the same BSS.
Local call:
An Intra-BSS call that can be locally switched by the BSS. For details on the Local Switch Service see TS 23.284.
Access MGW:
The MGW interfacing to the Radio Access Network

3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
AoIP
A (interface) over IP
AoTDM
A (interface) over TDM
APP
APPlication
BICC
Bearer Independent Call Control
BSS
Base Station Subsystem
CS
Circuit-Switched
CSData
CS Data and fax
IETF
Internet Engineering Task Force
IP
Internet Protocol
IPv4
Internet Protocol version 4
IPv6
Internet Protocol version 6
ITU-T
International Telecommunications Union-Telecommunication sector
MGW
Media GateWay
PCM
Pulse-Coded Modulation
RFC
Request For Comment
RTP
Real-Time Transport Protocol
RTCP
Real-Time Transport Control Protocol
SIP-I
Session Initiation Protocol with encapsulated ISUP
SSRC
Synchronisation Source
SVC
Switched Virtual Circuit
TDM
Time-Division Multiplexing
UDP
User Datagram Protocol
UP
User Plane
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