Patent ID: 7215642
Filing Date: 2007-05-08
Classification: H04L,H04W

Abstract:
1. A data transmission system comprising a transmitting side apparatus that transmits data and a receiving side apparatus that receives data, wherein: said receiving side apparatus measures the reception quality of received data and transmits, if an error is detected in the received data, to said transmitting side apparatus a retransmission request signal corresponding to the measured reception quality, wherein the correspondence is such that a plurality of retransmission request signals transmitted in response to detected errors are differentiated according to respective measures of reception quality; and said transmitting side apparatus detects, upon receiving the retransmission request signal, a capacity necessary for demodulation at said receiving side apparatus, based on the reception quality corresponding to the received retransmission request signal, and determines a capacity for data retransmission based on the detected demodulation capacity and traffic conditions, wherein the total number of reception quality measures that may differentiate the plurality of retransmission request signals is a number one less than a power of two.