Patent ID: 8514786

Claim:
A mobile terminal (UE) used in a mobile communication network that includes a mobility management entity (MME) and a serving gateway (S-GW), the mobile terminal comprising: a receiver that receives a paging employing IMSI (International Mobile-Station Subscription Identifier) from the mobility management entity, upon an arrival of an incoming call destined for the mobile terminal from an external network at the mobile communication network with the serving gateway, upon restarting of the mobility management entity, maintaining a specific S5/S8 bearer, while deleting other bearers, wherein the incoming call is notified to the serving gateway though the specific S5/S8 bearer maintained, and the mobility management entity is notified of the incoming call by a Downlink Data Notification signal inclusive of the IMSI sent from the serving gateway; wherein the serving gateway (S-GW) starts an operation of a timer to delete said other bearers; wherein said timer controls a time of maintaining the specific S5/S8 bearer by the serving gateway (S-GW); and a transmitter that, in response to the paging, re-attaches to the mobile communication network.