Patent ID: 8514770
Filing Date: 2013-08-20
Classification: H04B

Abstract:
1. A method of establishing an uplink in a satellite of a mobile satellite communication system, the method comprising: receiving a random uplink access signal from terminals included in a coverage of a satellite beam; estimating a location of each of the terminals; calculating an uplink transmission point in time when each of the terminals transmits an uplink signal, based on the estimated location of each of the terminals; transmitting, to each of the terminals, the calculated uplink transmission point in time; receiving the uplink signal from each of the terminals at the calculated uplink transmission point in time, wherein the calculating comprises calculating the uplink transmission point in time to synchronize uplink signals, transmitted from the terminals, based on the symbol unit; and verifying a symbol interval where interference occurs due to an inconsistent synchronization between subframes, and transmitting interference symbol interval information to each of the terminals using downlink control information to not allocate a resource to the verified symbol interval, when the uplink transmission point in time is calculated to synchronize uplink signals, transmitted from the terminals, based on the symbol unit.