rjb1000
commented
1 year ago SA4 advice:
- serviceDataFlowInformation should be mandatory (at least one entry in the array).
- requestedQoS needs to be within the floor/ceiling of the policyTemplateId, if cited.
- If no policyTemplateId is cited (e.g. because no Policy Templates are provisioned, or because the Media Session Handler just ignores this) it's up to the PCF whether to grant the request.
- If a policyTemplateId is cited but requestedQoS is omitted, the 5GMS AF populates the PCF QoS request using the parameters from the Policy Template.
I will attempt to provide a clarification in CR0037.
Context
TS 26.512 specifies a Network Assistance Session resource at reference point M5. The Media Session Handler must create one of these before it can invoke any of the Network Assistance operations.
When a new Network Assistance Session is created by invoking the M5_NetworkAssistance_createNetworkAssistanceSession operation, the Media Session Handler
POSTs in a NetworkAssistanceSession resource including:Clause 11.6.4 provides some guidance on creating a Network Assistance Session:
Clause 16.2 provides some guidance on the interactions between the 5GMS AF and the PCF at reference point N5/N33:
Problem description
It is not clear from TS 26.512 what the 5GMS AF behaviour should be when the policy template identifier is omitted from the NetworkAssistanceSession supplied in the createNetworkAssistanceSession operation.
The sentence quoted above from clause 16.2 "...based on existing policy templates that match the filtering criteria for a media streaming session..." is ambiguous. It seems to imply that Policy Templates are always involved. However, the property is optional in the NetworkAssistanceSession resource in clause 11.6.
Moreover, the sentence describes "...filtering criteria for a media streaming session..." for finding identifying Policy Templates but does not explain whether the filtering is performed by the Media Session Handler or by the 5GMS AF, nor does it specify which criteria are used for matching.
It is also not clear how the 5GMS AF should behave if any of the requested QoS parameter values lie beyond those of the cited Policy Template.
Suggested solution