Patent ID: 8144665

Claim:
A method, comprising: acquiring, by a first Serving General Packet Radio Service (GPRS) Supporting Node (SGSN) in a source network, version information of a second SGSN in a target network when a User Equipment (UE) activating an Idle mode Signaling Reduction (ISR) mechanism moves from the source network to the target network; determining, by the first SGSN, the second SGSN does not communicate with a Serving Gateway (S-GW) and does not support the ISR mechanism according to the version information of the second SGSN; sending, by the first SGSN, a first delete bearer message to the S-GW; deleting, by the S-GW, bearer resources on the S-GW after receiving the first delete bearer message; and indicating, by the S-GW, a Mobility Management Entity (MME) in the source network to delete the bearer resources on the MME by sending a second delete bearer message to the MME, wherein acquiring, by the first SGSN in the source network, the version information of the second SGSN in the target network, comprises: receiving by the first SGSN a context request message sent from the second SGSN which carries the version information of the second SGSN; and acquiring, by the first SGSN, the version information of the second SGSN according to the context request message.