Patent ID: 8031668

Claim:
A method for optimizing discontinuous reception mechanism in random access applied in E-UTRA network environment, with which a user equipment monitors PDCCH within a TTI window and is at active time to monitor the PDCCH, wherein during a contention based random access, the user equipment monitor the PDCCH at the active time when a contention resolution timer is running, and the user equipment monitors the PDCCH at the active time while the PDCCH indicating new transmission addressed to C-RNTI of the user equipment has not been received after successful receiving a random access response for a non-contention random access preamble during a non-contention based random access, wherein in the contention based random access, the method comprises the steps of: (A) the user equipment sending a randomly selected contention random access preamble by an up-link; (B) the user equipment receiving a random access response from a down-link, wherein the user equipment monitors the PDCCH for receiving the random access response within the TTI window; (C) the user equipment sending its identity by the up-link; and (D) the user equipment receiving a contention resolution message from the down-link, wherein the user equipment monitors the PDCCH at the active time for receiving the contention resolution message when the contention resolution timer is running.