A.15 Handling of MCVideo priority call

29.2143GPPPolicy and charging control over Rx reference pointRelease 17TS

A.15.1 General

Within the framework of MCVideo, when the SIP Core (3GPP TS 23.281 [61]) is implemented by an IMS core network, if the P-CSCF receives a SIP request message including a Resource-Priority header field with a namespace field and priority value defined for MCVideo for adjusting the priority of an MCVideo session, the P-CSCF shall provide the Reservation-Priority AVP and the MCVideo-Identifier AVP in the AA-Request command as defined in clause A.15.2 to allow the PCRF to set the corresponding PCC rule(s) according to the prioritized MCVideo service.

NOTE 1: The process of adjusting priority may occur several times during the course of one session, e.g. a normal MCVideo group call elevated to an MCVideo emergency group call and returned to a normal priority MCVideo group call, elevated to an MCVideo imminent peril group call and returned to a normal priority MCVideo group call.

NOTE 2: Upon reception of a request that requires the adjustment of the MCVideo priority, the PCRF is expected to derive the PCC Rules corresponding to the this MCVideo session, as appropriate according to operator policies.

NOTE 3: The PCRF can identify an MCVideo call using the IMS Communication Service Identifier specific to MCVideo, which is provided by the P-CSCF in the AF-Application-Identifier AVP in the AA-Request sent to PCRF.

A.15.2 Determination of MCVideo priority parameter values

When the P-CSCF receives an authorized Resource-Priority header field containing an appropriate namespace and priority value used for MCVideo in SIP signaling, the P-CSCF shall include the MCVideo-Identifier AVP and Reservation-Priority AVP in the AAR command towards the PCRF.

The MCVideo-Identifier AVP shall include the namespace defined for MCVideo as received within the Resource-Priority header field.

The Reservation-Priority AVP shall contain the priority value of the Resource-Priority header; the lowest priority shall be mapped to to DEFAULT (0), the next after the lowest to PRIORITY-ONE (1), and so on up to the highest priority which shall be mapped to PRIORITY-FIFTEEN (15).