Transmission timing control in digital radio telephony

摘要

PCT No. PCT/GB95/02135 Sec. 371 Date May 23, 1997 Sec. 102(e) Date May 23, 1997 PCT Filed Sep. 8, 1995 PCT Pub. No. WO96/08885 PCT Pub. Date Mar. 21, 1996In time domain multiplex/time domain multiple access communications between a base station and subscriber unit, the base station sends a timing reference signal. A subscriber unit responds with a data packet (a) sufficiently short to ensure correct reception by the base irrespective of transmission time. The base determines the transmission time taken and instructs the subscriber unit to advance its timings so that longer data packets (b) can be sent so as to be received when expected. The timing adjustment includes both a fixed present component dependent on approximate separation of base station and subscriber unit, and a second component from measurement of the transmission time taken.