B.9 Resource Sharing

29.5143GPP5G SystemPolicy Authorization ServiceRelease 18Stage 3TS

The P-CSCF may indicate to the PCF that media of an "Individual Application Session Context" resource may share resources with media belonging to other "Individual Application Session Context" resources according to 3GPP TS 23.228 [33].

If the P-CSCF determines that resource sharing is possible, it may at creation of a new "Individual Application Session Context" resource, include the "sharingKeyUl" attribute and/or "sharingKeyDl" attribute indicating that media resources may be shared in the related direction. The P-CSCF shall assign a distinct value for the "sharingKeyUl" attribute and/or "sharingKeyDl" attribute for each media component within the "medComponents" attribute.

NOTE 1: When resource sharing applies to both directions for a certain media component, the P-CSCF can assign the same value for "sharingKeyUl" attribute and "sharingKeyDl" attribute within the same media component.

The P-CSCF shall not include the "sharingKeyUl" attribute and/or "sharingKeyDl" attribute within the media components in the "medComponents" attribute when the "Individual Application Session Context" resource relates to an Emergency Session.

The PCF shall not include the "sharingKeyUl" attribute and/or "sharingKeyDl" attribute for those PCC/QoS Rules related to the RTCP traffic.

Trigger conditions that require applying or stopping resource sharing are described in 3GPP TS 24.229 [32].

NOTE 2: When P-CSCF needs to stop sharing according to the procedures described in 3GPP TS 24.229 [32], the P-CSCF will provide "null" value for the "sharingKeyUl" attribute and/or "sharingKeyDl" attribute within the media component in the "medComponents" attribute.