| 摘要 |
<p>When a downlink communication channel quality is informed of in the downlink packet communication using a shared channel, the communication channel quality for each RB that is obtained by dividing a downlink into a plurality of small bands (RBs) is informed of via the uplink. As the downlink band is getting wider, the number of RBs increases and the bands required to inform via the uplink also increases. Then, in the mobile station, the communication channel quality (CQI) of a first band (reference RB) is represented by a first code, while the CQI of each successive RB is represented by a further code using the CQI of the previous band as a reference. A base station, receiving those codes transmitted from the mobile station, is capable of restoring the values of communication channel quality (CQI) for each RB.
By coding a relative (e.g. differential) value expressing a relationship between CQI values of pairs of (e.g. adjacent) RBs, the transmission overhead for informing of downlink communication channel quality is reduced.
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