3GPP Work Item description

This page contains informal descriptive text only.  See master WID page for further details.

Feature: Mp (MRFC - MRFP) interface

Within the IP Multimedia Subsystem, the Multimedia Resource Function (MRF), through interactions with the User Equipment (UE), Application Server (AS) and Serving Call Session Control Function (S-CSCF), provides, for example, ad-hoc video and audio conference capabilities, and the support of announcements, tones and media streams processing.

The MRF is decomposed into two functions, i.e. the MRFC and MRFP. The Mp Interface, which is located between these two functions, supports the H.248/MEGACO protocol with the additional support of Multimedia specific H.248 Packages.

The intention of this WI is to define the use of H.248/MEGACO including the additional H.248/MEGACO Multimedia Packages between the MRFC and MRFP and to define the relationship between the S-CSCF – MRFC –interface (Mr-interface) SIP and SDP procedures/instructions and the associated H.248/MEGACO, including the additional Packages and procedures.

 The MRFC:

    §         Controls the media stream resources in the MRFP.

    §         Interprets information coming from an AS and S-CSCF (e.g. session identifier) and control MRFP accordingly.

    §         Generates CDRs

The MRFP:

    §         Controls bearers on the Mb reference point.

    §         Provides resources to be controlled by the MRFC.

    §         Mixes incoming media streams (e.g. for multiple parties).

    §         Sources media streams (for multimedia announcements).

    §         Processes media streams (e.g. media analysis).

Objective:

    §         To define the use of the H.248 protocol between the Multimedia Resource Function Controller (MRFC) and the Media Resource Function Processor (MRFP), i.e. across the Mp Interface. In particular, the required H.248 Packages, including the Multimedia H.248 Packages, will be identified. New H.248 Packages will be defined by external standardisation bodies (ITU-T SG 16) or/and CT4. The result produced by external bodies shall be evaluated taking into account the applicability for the packages and     the 3GPP Rel-7 time frame;

    §         The interaction between SIP and SDP procedures/messages and H.248/MEGACO procedures/messages, including Multimedia H.248 Packages, will be defined;

    §         The bearer control between the MRFP and various connecting functions will be defined;

    §         The signalling interaction between the MRFP and interconnected nodes will be considered.