For the EPC enhancing close to service

It discloses for reporting mobility event and/or the system reacted to mobility event, ways and means.Wireless transmitter/receiver unit (WTRU) may include processor, which is configured to be used at least partially for: establish with the 2nd WTRU close to service (ProSe) session；The generation of mobility event in cellular network is detected when the ProSe session is carrying out；One or more of type of type and ProSe session based on mobility event determines the type about the ProSe session action to be executed；And node in the cellular network is transmitted a notification to, wherein the notice includes the instruction about the ProSe session action to be executed.Node can be evolved node B (eNB), close to one of server and mobility management entity (MME).Node can be the 2nd WTRU.