Patent ID: 8031671

Claim:
A wireless communication system comprising: a packet data serving node (PDSN) in communication with a first base transceiver station (BTS) and a second BTS, the PDSN having a first logical PDSN that has at least a first IP address and a second logical PDSN that has a second IP address different from the first IP address; the first logical PDSN having multiple internet protocol (IP) addresses; and the first logical PDSN for communicating with a mobile station (MS) associated with one of the IP addresses in a first session through a first BTS; and in response to the MS requesting a second session with an IP address of the second logical PDSN through a second BTS, the PDSN recognizing that the first session is already established for the MS on the PDSN, the second logical PDSN utilizing upper call state and policy parameters for the first session and handing off between the IP address of the first logical PDSN and the IP address of the second logical PDSN without re-negotiating all call parameters.