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Content for  TR 23.860  Word version:  10.0.0

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1 Scope  2 References  3 Definitions and abbreviations  4 Requirements 
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1  Scope  p. 5

The system enhancements to enable codec rate adaptation at voice call setup over E-UTRA was standardized in Rel-9 in TS 23.401.
The scope of this document is to study and specify enhancements to existing codec selection and codec rate adaptation based on network loading conditions and operator policies over UTRA and E-UTRA. Potential enhancements are definition of the signalling and interfaces enabling:
  • To perform codec selection based on network loading conditions and operator policies during call establishment phase over both UTRA and E-UTRA;
  • To perform codec data rate adaptation (if possible for the selected codec and needed by the service) based on network loading conditions during call establishment phase over UTRA;
  • To perform codec data rate adaptation (if possible for the selected codec and needed by the service) for non-voice RTP-based services based on network loading conditions at call setup over E-UTRA;
  • To perform codec data rate adaptation (if possible for the selected codec and needed by the service) based on network loading indications during an on-going call over both UTRA and E-UTRA;
  • Support of codec rate adaptation by IMS Core Network entities (e.g., MGCF/MGW, IBCF/TrGW, etc.);
  • Setting of Maximum Bit Rate (MBR) to be greater than the Guaranteed Bit Rate (GBR) over E-UTRA.
The solutions can be moved to normative specifications independently of each other once the study on the particular solution has been concluded.
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2  References  p. 5

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]
TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".
[3]
TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2".
[4]
TS 26.114: "IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and interaction".
[5]
TR 22.813: "Study of Use Cases and Requirements for Enhanced Voice Codecs for the Evolved Packet System (EPS)".
[6]
RFC 3168  (2001): "The Addition of Explicit Congestion Notification (ECN) to IP", K. Ramakrishnan, S. Floyd and D. Black.
[7]
IETF Internet draft (2010): "Explicit Congestion Notification (ECN) for RTP over UDP", M. Westerlund, et. al., http://www.ietf.org/id/draft-ietf-avt-ecn-for-rtp-01.txt.
[8]
TS 29.163: "Interworking between the IM CN subsystem and CS networks - Stage 3".
[9]
TS 23.333: "Multimedia Resource Function Controller (MRFC) - Multimedia Resource Function Processor (MRFP) Mp interface: Procedures Descriptions."
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3  Definitions and abbreviations  p. 6

3.1  Definitions  p. 6

For the purposes of the present document, the terms and definitions given in TR 21.905 a apply.

3.2  Abbreviations  p. 6

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply.
ECN
Explicit Congestion Notification

4  Requirements  p. 6

4.1  General  p. 6

Following are the general requirements for the Codec rate adaptation enhancements to be studied:
  1. Codec rate adaptation enhancements shall not negatively affect the operation of pre-Rel 10 UEs.
  2. A UE-internal interface between the application being adapted and the layer responsible for forwarding the indications of the need to rate adapt is necessary and is assumed to be available. The definition of this interface is beyond the scope of this study.
  3. It shall be possible to apply Codec rate adaption when interworking with external networks (e.g. PSTN, non IMS networks).
  4. The Codec rate adaptation shall be applicable for audio and video media types.
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4.2  Functional Requirements  p. 6

Following are the requirements for solutions that are to provide the Codec rate adaptation enhancements:
  1. It should be possible to enforce Code rate adaptation for UEs which support these features when connected through a network which supports Codec rate adaptation independent of the remote UE/network's support for these features.
  2. The procedures for Codec rate adaptation during an on-going session shall not cause a SIP re-negotiation.
  3. The procedures for Codec rate adaptation during an on-going session shall allow the network to indicate to the UE that it should decrease its Codec rate.
  4. The Codec rate adaptation enhancements shall not require the eNB or RNC to have knowledge of the Codec selected for the multimedia session, so that future Codecs can be supported and enhancements of policies can be made without requiring impact to the RAN or upgrade of the RAN functional entities.
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