Patent ID: 8422385

Claim:
A method for performing a random access procedure by a user equipment (UE) in an idle-mode which desires to receive a specific broadcast/multicast service in a wireless communication system, the method comprising the steps of: receiving a first message from a network, the first message including a counting request for the broadcast/multicast service; in response to the first message, transmitting a preamble for a random access to the network; in response to the preamble, receiving a second message including uplink (UL) radio resource allocation information from the network, the second message further including timing adjustment information and a connection indicator; in response to the second message, transmitting a third message to the network using the uplink (UL) radio resource allocation information, the third message including a service identifier for the specific broadcast/multicast service; and in response to the third message, receiving a contention resolution message from the network, wherein, when the connection indicator indicates that a connection to the network is required, the third message includes both a response to the counting request and a Radio Resource Control (RRC) connection request message, and wherein, when the connection indicator indicates that a connection to the network is not required, the third message includes the response to the counting request without the Radio Resource Control (RRC) connection request message.