Patent ID: 8027356
Filing Date: 2011-09-27
Classification: H04W

Abstract:
1. A method for performing a random access procedure in a wireless communication system, the method comprising: transmitting a preamble for random access from a mobile station to a network; and receiving by the mobile station a random access response message from the network as a response to the preamble, the random access response message having a MAC (Medium Access Control) header and zero or more MAC Random Access Responses (MAC RARs), wherein the MAC header has a MAC sub-header, the MAC sub-header including a first 1-bit field and a second 1-bit field, the first 1-bit field being directly followed by the second 1-bit field, wherein the first 1-bit field indicates whether or not an additional field is included in the MAC header, wherein the second 1-bit field indicates whether or not the MAC sub-header has a random access preamble identifier or a backoff parameter, and wherein when the second 1 bit field indicates the MAC sub-header has the random access preamble identifier, the MAC RARs have a MAC RAR corresponding to the random access preamble identifier, and when the second 1 bit field indicates the MAC sub-header has the backoff parameter, the random access response message has no MAC RAR.