| 摘要 |
<p>When a handover is performed, a mobile station receives, from the movement origin base station, information on the movement destination base station and information relating to a sequence to be used for transmitting a random access signal to the movement destination base station. The mobile station receives a synchronization channel signal transmitted from the movement destination base station. Thereafter, the mobile station transmits the random access signal to the movement destination base station at a timing offset by a prescribed period from a timing of receiving a synchronization channel and at a frequency corresponding to that of the synchronization channel. A position of the timing/frequency used for transmitting the random access signal for the handover is used exclusively by the random access signal transmitted from the mobile terminal for which a handover is being performed or is used exclusively at the same time by a plurality of mobile stations for which handovers are performed. Thereby, interference between random access signals transmitted from a plurality of mobile stations are suppressed to zero or to a low level in order to increase the percentage of normal reception of the random access signals by the handover destination base station. This reduces the chance that a random access signal will have to be retransmitted, resulting in a shorter period of time being consumed by a handover.</p> |
