Patent ID: 8102804

Claim:
A method of receiving a random access response by a user equipment (UE) in a wireless communication system, the method comprising: transmitting a random access preamble from the UE to a base station (BS) at a first time; and receiving, by the UE, the random access response, wherein the random access response is responsive to the random access preamble and comprises information associated with a sub-frame number of an uplink sub-frame in which the random access preamble was transmitted, wherein the information associated with the sub-frame number of the uplink sub-frame is used by the UE to determine whether the random access response is for the UE, wherein the sub-frame number of the uplink sub-frame in which the random access preamble was transmitted is a renumbered sub-frame number of the uplink sub-frame wherein the renumbered sub-frame number is allocated only to sub-frames in which a random access channel (RACH) slot is present, wherein the UE is configured to receive the random access response only during a predetermined time period, and wherein the predetermined time period starts at a second time following the first time by an interval equal to half of a round trip time for a hybrid automatic repeat request (HARQ) process.