FIELD: information technology.
SUBSTANCE: method and apparatus utilise efficient precoding matrix verification in a multiple-input multiple-output MIMO wireless communication system. A wireless transmit/receive unit WTRU sends a precoding matrix index PMI to an eNodeB. The eNodeB sends a verification message including a PMI indicator indicating whether or not the PMI of the WTRU and a PMI of the eNodeB are identical. If the PMI of the WTRU and of the eNodeB are identical, the eNodeB sends only a PMI indicator, otherwise the eNodeB sends to the WTRU a PMI indicator and the PMI of the eNodeB. A plurality of PMIs may be sent simultaneously, and the PMIs may be partitioned into a plurality of groups. The PMI indicator may be either attached to or inserted into control signalling. PMI validation messages can be signalled to WTRU by control signalling or use of a dedicated reference signal.
EFFECT: higher throughput.
12 cl, 13 dwg, 23 tbl
