Patent ID: 8675618

Claim:
A logical channel establishment method for a mobile terminal supporting an unlicensed mobile access service in an unlicensed wireless system and a licensed wireless system, comprising: transmitting a resource request message for establishing a logical connection to the unlicensed wireless system; retransmitting, when a resource request rejection message is received or no response message is received before a timer expires, the resource request message after a retry timer expires; repeating retransmission of the resource request message a threshold number of retransmission times until a logical connection is established; if the logical connection is not established after retransmitting the resource request message the threshold number of retransmission times, comparing a received signal strength of the unlicensed wireless system with a threshold value; and if the received signal strength is less than the threshold value, transmitting the resource request message to another base station in the unlicensed wireless system.