Base station, mobile station, synchronization control method, and IC chip

A base station used in a radio communication system in which a mobile station receives signaling information transmitted by a base station via a shared control channel, detects a presence/absence of data addressed to the mobile station, demodulates a shared data channel when the data is present, and receives data transmitted by the base station, comprising:

• a synchronization request transmitting unit configured to transmit, to the mobile station, a synchronization request specifying a Signature and an uplink radio resource via the shared control channel;
• a feedback information receiving unit configured to receive, from the mobile station, feedback information which includes a data series corresponding to the Signature specified by the synchronization request, as a response to the synchronization request, via a random access channel;
• and
• a timing advance information generating/transmitting unit configured to generate timing advance information when receiving the feedback information, and to transmit, to the mobile station, the timing advance information.

A mobile station configured to receive signaling information transmitted by a base station via a shared control channel, to detect a presence/absence of data addressed to the mobile station, to demodulate a shared data channel when the data is present, and to receive data transmitted by the base station, comprising:

• a synchronization request receiving unit configured to receive, from the base station, a synchronization request specifying a Signature and an uplink radio resource via the shared control channel;
• a feedback information transmitting unit configured to transmit feedback information which includes a data series corresponding to the Signature specified by the synchronization request, as a response to the synchronization request, via a random access channel;
• and
• an adjusting unit configured to adjust a transmission timing of uplink data, based on timing advance information transmitted by the base station.

An IC chip having a function of a mobile station configured to receive signaling information transmitted by a base station via a shared control channel, to detect a presence/absence of data addressed to the mobile station, to demodulate a shared data channel when the data is present, and to receive data transmitted by the base station, wherein the mobile station comprises:

• a synchronization request receiving unit configured to receive, from the base station, a synchronization request specifying a Signature and an uplink radio resource via the shared control channel;
• a feedback information transmitting unit configured to transmit feedback information which includes a data series corresponding to the Signature specified by the synchronization request, as a response to the synchronization request, via a random access channel;
• and
• an adjusting unit configured to adjust a transmission timing of uplink data, based on timing advance information transmitted by the base station.