Patent ID: 8351378

Claim:
A method for deactivating an Idle Mode Signaling Reduction ISR, which is applicable to a system comprising a Serving-Gateway S-GW and two mobility management units associated with ISR function activation, wherein the method comprises: when an ISR deactivation is needed to be performed, the mobility management unit judging whether it is necessary to initiate a bearer deletion by the S-GW according to reasons of the ISR deactivation; in the situation that the judging result is necessary, the mobility management unit sending a request message of deleting bearer to the S-GW, and carrying, in the request message, an identifier which is used to instruct the S-GW to initiate the bearer deletion to the other mobility management unit associated with the ISR function activation; in the situation that the judging result is unnecessary, the mobility management unit notifying the other mobility management unit associated with the ISR function activation to perform the deactivation.