Patent ID: 8285286

Claim:
A method for random access of user equipment, comprising the steps of: setting a plurality of random access parameters having different values in accordance with a plurality of events for triggering random access; and when one of the plurality of events for triggering random access has occurred, performing random access according to at least one of the plurality of random access parameters corresponding to the event, wherein the plurality of random access parameters include initial transmission power parameters and ramping power parameters, and performing the random access comprises: transmitting a preamble using a transmission power corresponding to an initial transmission power parameter corresponding to the event; and when a response corresponding to the preamble has not been received, increasing the transmission power by a ramping power corresponding to a ramping power parameter corresponding to the event and re-transmitting the preamble using the increased transmission power, and wherein the initial transmission power parameter corresponding to one of a handover event and an uplink or downlink data resume event is greater than the initial transmission power parameter corresponding to one of an idle to connected mode transition event and a Radio Resource Control (RRC) connection re-establishment event.