Patent ID: 8879482
Filing Date: 2014-11-04
Classification: H04W

Abstract:
1. A method for allowing a mobile station to perform a contention based ranging in a broadband wireless access system, the method comprising: selecting a first ranging code subset or a second ranging code set that is different from the first ranging code subset among multiple ranging code subsets based on a purpose of the ranging and a mode of the mobile station, wherein the first ranging code subset is selected based on a first purpose of the ranging and a first mode of the mobile station, and the second ranging code subset is selected based on the first purpose of the ranging and a second mode of the mobile station; selecting any one code from one or more codes contained in the selected first or second ranging code subset; and transmitting the selected code to a base station, wherein said transmitting comprises: receiving uplink resource allocation information corresponding to the selected first or second ranging code subset including the transmitted code, from the base station; and transmitting a ranging request (AAI_RNG-REQ) message to the base station by using an uplink resource indicated by the uplink resource allocation information.