B.16 QoS hint support for data channel media

29.5143GPP5G SystemPolicy Authorization ServiceRelease 18Stage 3TS

If the P-CSCF receives a SIP request that requires provisioning of a service information to the PCF, the QoSHint feature is supported and an SDP attribute "a=3gpp-qos-hint" is included in one or more of the received data channel media descriptions, the P-CSCF may provide the "desMaxLatency" attribute and/or "desMaxLoss" attribute for each affected application media component within the "medComponents" attribute in the corresponding Npcf_PolicyAuthorization service operation towards the PCF.

NOTE: During the first interaction with the PCF, the P-CSCF does not know if the QoSHint feature is supported by the PCF. In this case the P-CSCF will include the information as if the feature is supported.

Upon receiving the information from the P-CSCF and if the QoSHint feature is supported, the PCF shall derive the QoS information as described in 3GPP TS 29.513 [7], clause 7.3.3.