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References

Document

Title/Contents

WID(s)

SP-080444

WID on Media Requirements for CS over IP based User Plane (AoIP-CSoIP)

Impacted Specifications

TS 26.102

Mandatory speech codec; Adaptive Multi-Rate (AMR) speech codec; Interface to Iu, Uu and Nb

[specify the Nb framing for GSM_FR and GSM_HR and the RTP Parameters for all NB Codecs]

TS 26.103

Speech codec list for GSM and UMTS

[specify the parameters for SDP signalling for 3GPP Codecs]

TS 26.202

Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Interface to Iu, Uu and Nb

[specify the RTP Parameters for AMR-WB]

New Dedicated Specifications/Reports

-

-

Supporting Individual Members: Alcatel-Lucent, China Mobile, Ericsson, Huawei, Nokia, Nokia Siemens Networks, Vodafone, Motorola.

AoIP allows removing transcoders from BSS, improving Transcoding-Free Operation (TrFO), maximizing flexibility for MSC-in-Pool networks and optimizing transport efficiency on the User Plane. This new feature requires changes to A-Interface Control Plane, A-Interface User Plane and MSC-MGW interface. To support end-to-end TrFO, minor changes were also necessary on the Nc and Nb interfaces. The Core Network shall support all 3GPP Codec Types (TS 26.103) including GSM_EFR, GSM_FR and GSM_HR.

This new paradigm for User Plane transport via IP and addition of GSM_FR and GSM_HR for transport via the A- and Nc-interfaces required evaluation and definition of RTP profiles, payload formats and RTP parameters. SA4 ensured that existing RTP Profiles and payload formats are sufficient for the CS speech telephony in 3GPP. It also prepared input to standardize all missing RTP payload formats in IETF. SA4 ensured that the User Plane transports on the AoIP-interface and the SIP-I-based Nb-interface are harmonized. It standardized all RTP parameters for applications on AoIP-interface and Nb-interface controlled by SIP-I-based Nc interface. SA4 standardized the SDP parameters for all 3GPP Codecs for the SIP-I-based Nc-Interface. It gave guidance to GERAN for the AoIP Control Plane negotiation for RTP parameters. It standardized the Nb framing for GSM_FR and GSM_HR for the Nb-interface controlled by BICC-based Nc interface. SA4 investigated issues related to transport of GTT (Global Text Telephony) and the potential need to support the RTP payload format for Text Conversation (IETF RFC 4103).

Core Network Impacts for A-Interface User Plane over IP (AoIP-CN) UID_400024

Resources: C4,C1,C3

References

Document

Title/Contents

WID(s)

CP-080278

WID on Core Network Impacts for A-Interface User Plane over IP

Impacted Specifications

TS 23.205

Bearer-independent circuit-switched core network; Stage 2 - CT4

TS 23.153

Out of band transcoder control; Stage 2 - CT4

TS 23.231

SIP-I based circuit-switched core network; Stage 2 - CT4

TS 23.009

Handover procedures - CT1

TS 29.232

Media Gateway Controller (MGC) - Media Gateway (MGW) interface; Stage 3 - CT4

TS 29.002

Mobile Application Part (MAP) specification - CT4

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) - CT3

New Dedicated Specifications/Reports

-

-

Supporting Individual Members: Alcatel-Lucent, China Mobile, Ericsson, Huawei, Nokia Siemens Networks, Vodafone.

CT standardized all Core Network Messages and Procedures to support A-interface User Plane over IP and the extension of Transcoder-Free Operation (TrFO/OoBTC) for GSM_EFR, GSM_FR, and GSM_HR. All telephony, fax and data (CSD, HSCSD) services shall be supported by the Core Network.

CT made standards for SIP-I based Core Network signalling. The agreed User Plane transport for the SIP-I based Nb-interface is RTP/UDP/IP, like foreseen for AoIP.

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