Patent ID: 7647060
Filing Date: 2010-01-12
Classification: H04B,H04W

Abstract:
1. A mobile station performing wireless communication with a base station using a DS-CDMA scheme, the mobile station comprising: a packet transmission unit configured to transmit a timing difference detection packet and a data packet, the timing difference detection packet and the data packet being coded in accordance with the DS-CDMA scheme in which data being transmitted is multiplied by a common scramble code for users in a cell and in which spreading codes orthogonal to each other are used to provide for simultaneous user access in the cell to the base station, the timing difference detection packet being configured to allow the base station to detect deviation in receive timing among a plurality of mobile stations, the data packet being configured to communicate data to the base station; and a transmission timing adjusting unit configured to adjust transmission timing of the data packet according to transmission timing control information received from the base station, wherein the transmission timing control information includes a transmission timing adjusting time interval to synchronize receive timings at the base station of respective data packets transmitted from the mobile stations, the transmission timing adjusting time interval being determined based on a time difference between a reference timing predefined at the base station and a receive timing of the timing difference detection packet at the base station, and the transmission timing control information further including a polarity information item indicating whether to put the transmission timings of the mobile stations ahead or behind the transmission timing adjusting time interval, and if the synchronization of the receive timings fails at the base station through the transmission timing adjusting time interval determined based on the time difference between the reference timing and the receiving timing of the timing difference detection packet, the transmission timing adjusting time interval is further adjusted based on a timing difference between the reference timing and a receive timing of the data packet.