Patent ID: 7154973
Filing Date: 2006-12-26
Classification: H04B

Abstract:
1. A spreading code synchronization method in a mobile communication system where, during handover of a mobile station from a first base station in communications with a second base station expected to initiate new communications, synchronous detection is carried out to detect a first spreading code assigned to the second base station, out of received signal which are received ach by the mobile station and each of which comprises an information data symbol spread by a combination of said first spreading code and a second spreading code, and a mask symbol spread by only the second spreading code, said spreading code synchronization method comprising: a first step of detecting a received timing of a mask symbol of said second base station in a state in which a received timing of said mask symbol from said first base station is excepted from candidates of received timings for said synchronous detection; and a second step of carrying out the synchronous detection of the first spreading code assigned to the second base station, wherein after said first and second steps are repeated at least either for a predetermined time or a predetermined number of times and when the received timing of the mask symbol of the second base station is not detected, the detection of the received timing of the mask symbol of said second base station is carried out using received timings of all scrambling codes as candidates without exception.