METHOD AND APPARATUS FOR SEAMLESS CONNECTIONS AND SERVICE CONTINUITY IN AN AGNOSTIC ACCESS INTERNET PROTOCOL MULITMEDIA COMMUNICATION SYSTEM

摘要

A UE (200) may establish various IMS Connections via various Access and Transport Networks (211). Each IMS Connection is associated with a specific contact address and all IMS connections are associated with a single specific Private User ID (229). Also various IMS connections may be established through different or identical P-CSCFs. For example, active IMS Connection (213) is associated with contact address 1 (203) and P-CSCF #1 (215), while IMS Connection #2 (217) is associated with contact address 2 (205) and P-CSCF #2 (219). All IMS connections shown in FIG. 2 are via IPsec and are connected to S-CSCF (227). Therefore, at S-CSCF (227) the UE (200) is associated with one Private User ID (229) based upon the UE (200) ISIM (201). Thus in accordance with the embodiments, sessions may be moved between IMS connections and P-CSCFs which facilitates handoffs between various Access and Transport Networks (211).