Communication system, method for the same and mobile station and base station used for the same

摘要

The present invention enables a high load to a mobile station and an uplink overhead to be reduced when a CQI measurement of a PRB needed for scheduling or adaptive modulation is informed of. At a base station, a set of PRBs (an active set) for which the measurements of CQIs are to be informed of is decided for each mobile station. Each mobile station measures only CQIs of the PRBs that form the active set designated by the base station and informs the base station of the measurements. That can reduce the load on the mobile station and also reduce the amount of information for informing the CQIs, thus, the uplink overhead can be also reduced.

主权项

1. A communication system comprising:
a mobile station which measures a communication channel quality of a wireless band obtained by dividing a downlink communication band into a plurality of wireless bands and informs a base station of the measurement via an uplink, wherein said base station comprises: a set managing unit that allocates a set comprising at least one wireless band whose quality is to be measured by said mobile station and sends, to said mobile station, a message which includes said at least one wireless band; wherein said set managing unit is adapted to allocate to said mobile station a different set of one or more wireless bands to be measured by said mobile station, based on a request from said mobile station to add or delete one or more wireless bands from said set; and wherein said mobile station comprises: a requesting unit that requests to add a wireless band not included in the current set to said current set, upon an interference level of the wireless band being lower by a predetermined level than a maximum interference level or an average interference level in the current set.