Network attachment for IMS systems for legacy CS UE with home node B access
K Mahdi, Z Zhang, D Chunyan - US Patent 8,711,846, 2014 - Google Patents
(57) ABSTRACT A system and method for allowing legacy circuit Switch user equipment
(CSUE) to operate via a packet Switch system, such as an IP Multimedia Subsystem (IMS)
system, is pro vided. The mobility and session control aspects of commu nications with the
legacy CSUE is separated. A user agent is placed in the receiving node (eg, a home node
B) that acts as the SIP agent for the CS UE for session control. An inter working function is
provided to allow mobility between the macro CS network and the PS (eg, IMS) network …
(CSUE) to operate via a packet Switch system, such as an IP Multimedia Subsystem (IMS)
system, is pro vided. The mobility and session control aspects of commu nications with the
legacy CSUE is separated. A user agent is placed in the receiving node (eg, a home node
B) that acts as the SIP agent for the CS UE for session control. An inter working function is
provided to allow mobility between the macro CS network and the PS (eg, IMS) network …
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