Patent ID: 8625444

Claim:
A method for access, comprising: receiving, by an old Mobility Management Entity (MME), an old Routing Area Identification (RAI) and a Packet Temporary Mobile Subscriber Identity (P-TMSI) from a Serving General Packet Radio Service (GPRS) Support Node (SGSN), wherein the old RAI and the P-TMSI is sent from the SGSN according to an address of the old MME, and the address of the old MME is found by the SGSN according to the old RAI and the P-TMSI carried by a user equipment (UE); reconstructing, by the old MME, a Global Unique Temporary Identity (GUTI) from the old RAI and the P-TMSI; obtaining, by the old MME, a UE context of the UE according to the GUTI; and returning, by the old MME, the UE context of the UE to the SGSN.