Patent ID: 8018899
Filing Date: 2011-09-13
Classification: H04W

Abstract:
1. A handoff system between different kinds of wireless devices, the system comprising: a plurality of wireless devices comprising a source device and a target device; a Session Initiation Protocol (SIP) server which requests a routing path update when a handoff request signal is input from the source device, and which gets the target device to participate in a current session; and a gateway which updates a predetermined routing path when a request signal for the routing path update is input, and transmits data to the source device and the target device via the updated routing path, wherein when the handoff request signal is input, performing handoff by transferring the current session from an access node in a first network area to an access node of a second network area, wherein if a pause option is included in the handoff request signal, the SIP server maintains a current Real-time Transport Protocol (RTP) traffic flow with the source device and the target device.