Patent ID: 8422510
Filing Date: 2013-04-16
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 (RARs), wherein the MAC header includes a first MAC sub-header and a second MAC sub-header, wherein the first MAC sub-header includes a corresponding first 1-bit field and a corresponding second 1-bit field, wherein the second MAC sub-header includes a corresponding first 1-bit field and a corresponding second 1-bit field, wherein the first 1-bit field of the first MAC sub-header and/or and the first 1-bit field of the second MAC sub-header indicates whether or not more fields are included in the MAC header, wherein, when the second 1-bit field of the first MAC sub-header indicates the first MAC sub-header includes a backoff parameter, there is no MAC RAR corresponding to the first MAC sub-header in the random access response message, and wherein, when the second 1-bit field of the second MAC sub-header indicates the second MAC sub-header includes a first random access preamble identifier, the random access response message includes a MAC RAR corresponding to the first random access preamble identifier, wherein the first 1-bit field of the first MAC sub-header is directly followed by the second 1-bit field of the first MAC sub-header, and wherein the first 1-bit field of the second MAC sub-header is directly followed by the second 1-bit field of the second MAC sub-header.