| 摘要 |
<p>There is provided a method for a mobility management entity, MME (MME_1 ) in a pool of MMEs (MME_1; MME_2; MME_3) being adapted for communicating with at least one other MME (MME_2) in the pool of MMEs, the MME (MME_1 ) moreover being adapted for communicating with a serving gateway, SGW (S_GW), the MME (MME_1 ) managing the mobility of user entities (UE) for establishing packet data communication between the serving gateway and user entities, UEs, via at least a base station (eNB). The method comprises the steps of - establishing (400) a UE context for a user entity; - appointing (404) a back-up MME for holding a duplicate context of the user entity; - informing (406) the SGW in which MME a duplicate context is held, or is to be held; and - transmitting (408) a duplicate context to the appointed MME. Further, a method for serving gateway, SGW, is provided as well as MME and a SGW.</p> |
