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TR 23.977 (SA2)
Bandwidth And Resource Savings (BARS) and speech enhancements for Circuit Switched (CS) networks

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(P) V14.0.0    2017/03    55 p.
(P) V13.0.0    2015/12    55 p.
(P) V12.0.0    2014/09    56 p.
(P) V11.0.0    2012/09    56 p.
(P) V10.0.0    2011/03    56 p.
(P) V9.0.0    2009/12    56 p.
(P) V8.0.0    2008/12    56 p.
(P) V7.0.0    2007/06    56 p.
(P) V6.1.0    2004/09    56 p.

Rapporteur:  Mr. Seiser, Franz
See also:  –

The objective of this TRis to identify the full set of requirements for bandwidth and resource savings and improved speech quality, with specific consideration to networks supporting A/Gb mode and the bearer independent circuit-switched core network (BICN). The different architectural solutions to meet these requirements will be assessed.

Consideration shall be made to existing architectures and solutions to provide harmony between 2G nodes, UMTS nodes and external networks (PSTN/ISDN). Backward compatibility to existing solutions and ease of network introduction/upgrade shall be given high importance.


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1 Scope    2 References    3 Definitions, symbols and abbreviations    3.1 Definitions    3.2 Symbols    3.3 Abbreviations    4 Network deployment scenarios to be studied    4.1 GSM network architecture before Release 4    4.2 UMTS network architecture in Release 99    4.3 Packet transport network between MGWs in an A/Iu mode BICN    4.4 TDM transit network between A/Iu mode PLMNs    4.5 Packet transport transit network between PLMNs    5 Call Scenarios to be studied    5.1 Mobile to Mobile call Scenarios    5.2 Mobile to PSTN call scenarios    5.3 Roaming and multi-network call scenarios    5.4 CS domain to IMS interworking scenario    5.5 A selection of handover scenarios    6 General requirements for architectural solutions    6.1 Overall requirements    6.2 Status of specifications for TFO and TrFO in 3GPP    7 Requirements and architectural solutions for Resource Savings    7.1 AMR-NB configurations    7.2 AMR-WB configurations    8 Requirements and architectural solutions for bandwidth savings    8.1 Background    8.2 Requirements    8.3 Architectural solutions    9 Requirements and architectural solutions for speech quality Improvements    9.1 Requirements    9.2 Architectural solutions    9.3 Summary    10 Requirements and architectural solutions for avoiding duplication in transcoder development    10.1 Background and requirements    10.2 Architectural solutions    11 Conclusions    A Example for migrating a service to TrFO    A.1 Service description    A.2 Realization    A.3 Summary and conclusions    B Change history   


1   Scope   PDF-p. 6
2   References
3   Definitions, symbols and abbreviations   PDF-p. 7
4   Network deployment scenarios to be studied   PDF-p. 8
5   Call Scenarios to be studied   PDF-p. 14
6   General requirements for architectural solutions
7   Requirements and architectural solutions for Resource Savings
8   Requirements and architectural solutions for bandwidth savings   PDF-p. 34
9   Requirements and architectural solutions for speech quality Improvements
10   Requirements and architectural solutions for avoiding duplication in transcoder development
11   Conclusions   PDF-p. 43
A   Example for migrating a service to TrFO   PDF-p. 44
B   Change history   PDF-p. 54

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