Patent ID: 8041361

Claim:
A method of network resource release processing, comprising: receiving, by a serving gateway (serving GW), a message sent from a peer endpoint network element (NE), when a user equipment (UE) changes from a 3rd Generation Partnership Project (3GPP) network to a non-3GPP network, wherein the UE using IDLE MODE SIGNALING REDUCTION (ISR) mechanism registers to two 3GPP communication networks; wherein the receiving, by the serving GW, the message sent from the peer endpoint NE comprises: receiving, by the serving GW, a delete bearer request message or a binding revocation indication message sent from a packet data network gateway (PDN GW), wherein the delete bearer request message or the binding revocation indication message includes a first indication information indicating that a communication network of the UE changes from the 3GPP communication network to the non-3GPP communication network; and deleting network resources established by the two 3GPP communication networks for the UE according to the message; wherein the deleting the network resources established by the two 3GPP communication networks for the UE comprises: sending, by the serving GW, the delete bearer request message or a delete Packet Data Protocol (PDP) context request message to notify mobility management NEs of the two 3GPP communication networks to release the network resources established for the UE; receiving, by the mobility management NEs of the two 3GPP communication networks, the delete bearer request message or the delete PDP context request message; and releasing the resources of the UE in the two 3GPP communication networks.