Table of Contents

Foreword
1 Scope
2 Normative references
  2.1 Abbreviations and definitions
3 General approach
4 The RA0 Function
5 The RA1 Function
6 The RA1" Function
7 Split/Combine and Padding Functions
  7.1 Data Frame distribution into the channels by the
      Split/Combine function
  7.2 Substream numbering
  7.3 Initial Substream Synchronisation for Transparent
      Services
  7.4 V110 Frame Synchronisation (TCH/F9.6 or TCH/F4.8
      channel coding)
  7.5 A-TRAU Frame Synchronisation (TCH/F14.4 channel
      coding)
  7.6 Network Independent Clocking
  7.7 Padding
8 The RA1/RA1' Function
   8.1 Radio Interface rate of 12 kbit/s
   8.2 Radio Interface rate of 6 kbit/s
   8.3 Radio Interface rate of 3.6 kbit/s
   8.4 Synchronisation
   8.5 Idle frames
9 THE RA1'/RAA' FUNCTION
   9.1 Radio Interface rate of 14,5 kbit/s
   9.2 Synchronisation
   9.3 Idle frames
10 THE RAA' FUNCTION
   10.1 Coding of A-TRAU frame
   10.2 Framing Pattern Substitution in A-TRAU frame
11 THE RAA" FUNCTION
12 The RA2 Function
13 The Multiplexing Function
14 Support of non-transparent bearer services
   14.1 TCH/F9.6 and TCH/F4.8 kbit/s channel codings
   14.2 TCH/F14.4 channel coding
15 Support of transparent bearer services
   15.1 TCH/F9.6 and TCH/F4.8 channel codings
   15.2 TCH/F14.4 channel coding
16 Frame Formats
Annex A (informative): Frame Pattern Substitution
    A.1 Special cases
    A.2 False Z sequence detection
History

Abstract

This document specifies rate adaptation functions to be used in GSM PLMN Base Station Systems (BSS) and transcoders for adapting radio interface data rates to the 64kbit/s that are needed at the MSC in accordance with GSM 03.10. The number of Base Station System - Mobile-services Switching Centre (BSS-MSC) traffic channels that support data rate adaptation may be limited. Certain channels may not support data rate adaptation but those that do must conform to this document. This specification should be considered with GSM 04.21 in order to provide a complete description of PLMN rate adaptation.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	SMG 3
Supersedes	GTS GSM 08.20 : 5.3.0