Patent ID: 8599765

Claim:
A method for preventing a detachment of a user equipment (UE) from a network, comprising: determining, by a mobility management entity, that a default bearer between the UE and the network is a last default bearer connecting the UE to the network, preventing deactivation of the default bearer between the UE and the network when at least one bearer between the UE and the network is to be deactivated based on a quality of service parameter, wherein the default bearer and the at least one bearer are associated with a serving gateway, wherein preventing deactivation of the default bearer between the UE and the network is accomplished by rejecting a request to deactivate the at least one bearer when deactivating the at least one bearer would result in an unexpected UE detachment from the network, and wherein rejecting the request to deactivate the at least one bearer is implemented by the mobility management entity, wherein the quality of service parameter of the UE is a priority level of the UE, and wherein a decision is made to deactivate the at least one bearer when the priority level of the UE is lower than a priority level of another UE connected to the network.