Patent ID: 7933243

Claim:
A method of performing a random access procedure between a communication terminal and a network, comprising: transmitting, by the communication terminal, a RACH (Random Access CHannel) preamble to the network; receiving, by the communication terminal, a RACH response from the network; monitoring, by the communication terminal, a downlink channel according to a DRX (Discontinuous Reception) active time until a radio resource allocation for an initial transmission is indicated according to radio resource allocation information received from the network, if the RACH preamble was signaled by the network, wherein the DRX active time specifies a time until the radio resource allocation for an initial transmission is indicated if the RACH preamble was signaled by the network; and starting, by the communication terminal, a contention resolution timer and monitoring the downlink channel until the contention resolution timer is expired, if the RACH preamble was selected by a MAC (Medium Access Control) entity of the communication terminal, wherein the monitoring is not performed if the contention resolution timer is expired.