Patent ID: 7602872
Filing Date: 2009-10-13
Classification: H04L

Abstract:
1. A scheduling method of a transmitter which communicates with K receivers, for a multicarrier communication system using N subcarriers, the method comprising the steps of: (a) determining a respective channel quality information (CQI) feedback quantity that is indicative of the number of subcarriers for which CQIs will be fed back from among the N subcarriers, for each of the K receivers; (b) transmitting the determined CQI feedback quantities to the K receivers, respectively; (c) receiving CQIs, corresponding to the determined CQI feedback quantities, fed back from the K receivers, respectively; (d) allocating subcarriers for which there are CQIs fed back from at least one receiver among the K receivers among the N subcarriers, to any one receiver among the receivers that have fed back CQIs; and (e) allocating subcarriers for which there is no CQI fed back from any receiver among the K receivers among the N subcarriers, to a receiver having minimum throughput at a present timing point among the K receivers, wherein the received CQIs include a partial CQI, when a CQI feedback scheme used in the multicarrier communication system is a partial CQI feedback scheme, and the partial CQI includes CQIs for particular subcarriers among the CQIs for the N subcarriers, wherein the received CQIs include an average CQI, when the CQI feedback scheme is an average CQI feedback scheme, and the average CQI is generated by averaging the CQIs for the N subcarriers, and wherein step (d) comprises allocating subcarriers for which there are CQIs fed back from at least one receiver among the K receivers, to a receiver that has fed back a CQI indicating the best channel state.