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Content for  TR 23.977  Word version:  17.0.0

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1  Scopep. 6

The objective of this technical report is 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.

2  Referencesp. 6

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.
TS 23.002: "Network architecture".
TS 23.153: "Out of band transcoder control; Stage 2".
TS 23.053: "Tandem Free Operation (TFO); Service description; Stage 2".
TS 28.062: "Inband Tandem Free Operation (TFO) of speech codecs; Service description; Stage 3".
TS 26.103: "Speech codec list for GSM and UMTS".
TR 26.975: "Performance Characterization of the AMR Speech Codec".
TR 26.976: "Performance characterization of the Adaptive Multi-Rate Wideband (AMR-WB) speech codec".
TS 26.102: "Mandatory speech codec; Adaptive Multi-Rate (AMR) speech codec; Interface to Iu, Uu and Nb".
[9]  Void.
TS 48.060: "In-band control of remote transcoders and rate adaptors for full rate traffic channels".
TS 48.061: "In band control of remote transcoders and rate adaptors for half rate traffic channels".
TS 52.021: "Network Management (NM) procedures and messages on the A-bis interface".
TS 29.163: "Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks".
ITU-T Recommendation Q.1912.5: "BICC SIP Interworking".
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 29.007: "General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)".
TS 48.008: "Mobile Switching Centre - Base Station System (MSC-BSS) interface; Layer 3 specification".
TS 26.101: "Mandatory speech codec speech processing functions; Adaptive Multi-Rate (AMR) speech codec frame structure".

3  Definitions, symbols and abbreviationsp. 7

3.1  Definitionsp. 7

For the purposes of the present document, the definitions in TR 21.905 apply as well as the following terms and definitions.
Bearer Independent Core Network :
This term refers to a core network (CN) comprised of MSC Server, CS-MGW and GMSC Server nodes to support MSC and GMSC functionality, as defined in TS 23.002.
Codec Configuration :
The Codec Configuration of a codes type ,like AMR, includes mainly the Active Codec Set, the setting of the OM flag and DTX parameters, etc.
Mega (Million) Instructions Per Second. This is a measure for the required DSP capacity. It is here in this context related to the "ETSI-DSP" as defined in 3GPP SA4 for the complexity characterisation of the 3GPP Speech Codec algorithms.

3.2  Symbolsp. 7

For the purposes of the present document, the following symbols apply:
the reference point internal to the BSC functional entity, between the transcoders and the rest of the BSC functions.
interface between the BTS and the BSC

3.3  Abbreviationsp. 7

For the purposes of the present document, the abbreviations in TR 21.905 apply as well as the following abbreviations:
Bearer Independent Core Network
Bearer Independent Call Control
Digital Signal Processor
MSC Server
Out of Band Transcoder Control
TFO Protocol Termination
User Plane Termination

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