Patent ID: 8838168

Claim:
A user apparatus for data communication, comprising: a transmitter; a receiver; a processor configured to: send, via the transmitter a request message to a mobility management entity (MME) of a long term evolution (LTE) network, wherein the request message comprises ability information of the user apparatus indicating whether the user apparatus has an ability to access one of a Universal Terrestrial Radio Access Network (UTRAN) and a GSM/EDGE Radio Access Network (GERAN); receive, via the receiver, a transaction identifier (TI), wherein the TI is generated based on the ability information of the user apparatus by the MME and for a bearer identifier of the user apparatus in the LTE network; communicate, via the receiver and the transmitter, with the LTE network to leave the LTE network; and perform an access procedure to access, via the receiver and the transmitter, the one of the UTRAN and the GERAN by using the TI.