Patent ID: 8040913

Claim:
A method for performing a random access procedure in a wireless communication system, the method comprising: transmitting a first preamble for random access from a mobile station to a network; receiving by the mobile station a random access response message from the network as a response to the first preamble, the random access response message having a MAC (Medium Access Control) header and zero or more MAC Random Access Responses (MAC RARs); determining if a field in a MAC sub-header of the MAC header indicates a backoff parameter exists in the MAC sub-header; obtaining the backoff parameter from the MAC sub-header when the field in the MAC sub-header indicates the backoff parameter exists in the MAC sub-header; and performing backoff using the backoff parameter obtained from the MAC sub-header, wherein there is no corresponding MAC RAR in the random access response message when the field in the MAC sub-header indicates the backoff parameter exists in the MAC sub-header.