Patent ID: 9474097
Filing Date: 2016-10-18
CPC Classification: H04W

Claim Text:
1. A method by a mobile terminal for transmitting a location registration result of the mobile terminal, the method comprising: transmitting by the mobile terminal a first location registration request message for location registration to a first cellular network; receiving by the mobile terminal a location registration rejection message including location registration rejection information when the location registration fails, from the first cellular network; and transmitting by the mobile terminal a second location registration request message including the location registration rejection information received from the first cellular network, to a second cellular network; completing by the mobile terminal the location registration in the second cellular network when a message indicating a successful connection with the second cellular network to allow location registration in the second cellular network is received; after the location registration is completed, receiving by the mobile terminal a message including location registration conversion information generated and transmitted by the second cellular network when the second cellular network determines that the first cellular network is communicatively connectable to the mobile terminal based on the location registration rejection information; and wherein, by the mobile terminal, the connection with the second cellular network is maintained if the message including the location registration conversion information is not received from the second cellular network and the message including the location registration conversion information is received by the mobile terminal if the connection conversion to the first cellular network is available when the second cellular network determines that a current state of the first network will accept a location registration request from the mobile terminal, performing by the mobile terminal a connection conversion to the first cellular network based on the location registration conversion information.