Patent ID: 7953043

Claim:
A packet switched radio telecommunication system, comprising: a support packet data serving node (PDSN) to assign a temporary Internet Protocol (IP) address to a mobile terminal in its service area, to maintain a direct link to a neighboring PDSN, and to transmit handover data and the temporary IP address assigned by the support PDSN to the neighboring PDSN via the direct link; and a target PDSN to register the temporary IP address in an IP pool in response to a request from the mobile terminal moved into a service area of the target PDSN, wherein the target PDSN receives down-link frame data from the support PDSN via the direct link, the down-link frame data being transmitted to the mobile terminal at the temporary IP address, and wherein the neighboring PDSN is the target PDSN, and the target PDSN compares a temporary IP address identified by the mobile terminal with the temporary IP address transmitted from the support PDSN, and if they are identical, registers the temporary IP address in the IP pool.