Patent ID: 8112087
Filing Date: 2012-02-07
Classification: H04W

Abstract:
1. A method for establishing a Radio Resource Control (RRC) connection with a Radio Access Network (RAN) in a User Equipment (UE) operating in an idle mode in a mobile communication system, comprising: comparing a strength of a signal received from a serving cell with a threshold upon receiving a request for a signaling connection setup from an upper layer; transmitting an RRC connection request message to the RAN after comparing the strength of the signal with the threshold; measuring strengths of signals from neighbor cells and monitoring a downlink channel of the serving cell to receive the response message during a first time period beginning at transmission of the RRC connection request message and prior to reception of a response message for the RRC connection request message, when the signal strength of the serving cell is less than the threshold; and receiving the response message from the RAN on the downlink channel.