Patent ID: 7372889

Claim:
A mobile station for wirelessly transmitting to a base station by DS-CDMA a signal which is spread by multiplying a spreading code, comprising: a chip-pattern generating unit which generates one or a plurality of predetermined chip patterns by chip repeating to a spreading chip sequence for a predetermined number of repetitions, thereby generating a signal comprising said predetermined chip pattern; a multiplying unit which multiplies, to the signal comprising said predetermined chip pattern, one or a plurality of phases specific to said mobile station; a transmission timing control unit which controls transmitting timings of transmitting signals so that timings of receiving at the base station from respective mobile stations coincide; and a timing control switching unit which, when receiving a set of controlling information indicating a cell environment, selects, based on said cell environment, one of the low-precision timing control unit and a high-precision transmission control unit which controls transmitting timings of transmitting signals so that a time difference at the base station among timings of receiving from the mobile station approaches zero, wherein said transmission timing control unit comprises a low-precision timing control unit which controls said transmitting timings of the transmitting signals so as to contain time differences among the timings of receiving at the base station from the respective mobile stations.