Patent ID: 8280381

Claim:
An intra-system handoff method comprising the following steps: S 302 , when deciding a handoff of UE to a target base station, a source base station issues a handoff request to the target base station; S 304 , in response to the handoff request from the source base station, the target base station informs the source base station to conduct handoff for the UE; S 306 , after the completion of the handoff, the target base station issues an update request to a Mobility Management Entity (MME); S 308 , in response to the update request from the target base station, the MME conducts Serving GW selection, and further fulfils the intra-system handoff; and S 3066 , after the handoff acknowledgement is received, the target base station sends the update request to the MME, wherein the update request carries at least user plane tunnel information and the address information of the target base station.