Apparatus and method for session initiated protocol (SIP) registration procedure for access network bitrate recommendation (ANBR) capability signaling

An apparatus for implementing a Session Initiated Protocol (SIP) registration procedure for access network bitrate recommendation (ANBR) capability signaling, the apparatus comprising:

• radio front end circuitry;
• and
• processor circuitry, coupled to the radio front end circuitry, and configured to:
• determine whether a Public Land Mobile Network (PLMN) is ANBR capable;
• receive, using the radio front end circuitry, a first SIP request message from a user equipment (UE) to request whether a Proxy-Call Session Control Function (P-CSCF) serving the PLMN is ANBR capable;
• send, using the radio front end circuitry, a first SIP response message to the UE to indicate that the P-CSCF is ANBR capable;
• receive, using the radio front end circuitry, a second SIP request message from the UE including an ANBR attribute;
• and
• pass, using the radio front end circuitry, the ANBR attribute through the PLMN to an access node which is connected to the UE when the PLMN is ANBR capable.

A system for implementing a Session Initiated Protocol (SIP) registration procedure for access network bitrate recommendation (ANBR) capability signaling, the system comprising:

• a user equipment (UE);
• and
• a Proxy-Call Session Control Function (P-CSCF) serving a Public Land Mobile Network (PLMN),
• wherein the UE is configured to send a first SIP request message to determine whether the P-CSCF is ANBR capable,
• wherein the P-CSCF is configured to send, in response to the first SIP request message, a first SIP response message to the UE to indicate that the P-CSCF is ANBR capable,
• wherein the UE is further configured to send, in response to the first SIP response message, a second SIP request message including an ANBR attribute, and
• wherein the P-CSCF is further configured to pass, in response to the second SIP request message, the ANBR attribute through the PLMN to an access node which is connected to the UE.