METHOD OF DATA RETRANSMISSION IN MULTI-CARRIER TRANSMISSION AND COMMUNICATION APPARATUS HAVING DATA RETRANSMISSION CONTROL DEVICE

摘要

A data retransmission method capable of providing a practical ARQ (automatic repeat request) in a multi-carrier transmission such as OFDM. In this method, all the carriers (sub-carriers) are divided into a plurality of groups in advance so that the groups are used as a data retransmission unit. An error detection code is added to each transmission symbol to be transmitted and when an error is detected by a mobile terminal device (100) of the reception side, a sub-carrier information acquisition unit (130) counts the number of sub-carriers of the reception level below a predetermined reference and a group having the count value greater than a threshold value is decided to be retransmitted.