Question: In Mission Critical Services, as per 3GPP standards, how is a request for resources for transmission control (e.g., floor control in MCVideo/MCData) typically handled during session establishment?
Option 1: Directly from the SIP Core to the PCRF using a custom resource allocation protocol.
Option 2: Through the IMS standard procedures as specified, including bandwidth information in the session description.
Option 3: By sending a separate request for transmission control resources after the media plane resources have been allocated.
Option 4: Independently via the Rx reference point from the MC Service Server to the PCRF, without involving IMS procedures.
Explanation: According to the 3GPP standards for Mission Critical Services, during session establishment, resource requests for transmission control utilize standard IMS procedures. This involves including necessary bandwidth information for transmission control traffic requirements within the session description, ensuring efficient resource allocation.