Patent ID: 8614986
Filing Date: 2013-12-24
Classification: H04L,H04W

Abstract:
1. A method of performing a ranging with a base station by a mobile station in a mobile communication system, considering an operating mode of the mobile communication system, the method comprising: receiving an S-SFH (secondary superframe header) from the base station, wherein the S-SFH includes information indicating whether the mobile communication system supports a WirelessMAN OFDMA; obtaining ranging channel information for performing an initial ranging, a handover ranging and a periodic ranging from the S-SFH, when the mobile communication system supports the WirelessMAN OFDMA; and performing at least one of the initial ranging, the handover ranging and the periodic ranging with the base station using the ranging channel information, wherein the periodic ranging is performed using a first ranging interval allocated in a unit of one symbol period, and wherein each of the initial ranging and the handover ranging is performed using a second ranging interval allocated in a unit of two symbol periods.