| 摘要 |
FIELD: radio engineering, communication.SUBSTANCE: upon handover, 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 synchronisation channel signal transmitted from the movement destination base station. The mobile station transmits the random access signal to the movement destination base station at a timing offset by a prescribed period from a time of receiving a synchronisation channel and at a frequency corresponding to that of the synchronisation channel. A position of the time/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 handover is being performed or is used exclusively at the same time by a plurality of mobile stations for which handovers are performed. Thus, interference between random access signals transmitted from the plurality of mobile stations is suppressed to zero or to a low level to increase the percentage of normal reception of random access signals by the handover destination base station.EFFECT: minimising the period of time during which data transmission is interpreted immediately for handover so that handover is efficiently performed in a mobile communication system in which handover is performed.4 cl, 10 dwg |
