Patent ID: 7583968
Filing Date: 2009-09-01
Classification: H04L

Abstract:
1. A radio communication apparatus in a radio packet communication system for feeding back radio link quality information, which has been measured on a packet receiving side, to a transmitting side and adaptively controlling a modulation scheme and/or encoding rate on the transmitting side using the quality information, comprising: estimating means for estimating a variation-with-time characteristic of the radio link quality using the radio link quality information reported by the packet receiving side; changeover means for adaptively changing over a target error rate using the variation-with-time characteristic; deciding means for deciding a modulation scheme and/or encoding rate, in such a manner that packet error rate becomes equal to the target error rate, using the radio link quality information as well as reception success/failure information reported by the packet receiving side; and means for transmitting a packet based upon the modulation scheme and/or encoding rate decided; wherein said estimating means estimates the variation-with-time characteristic of the radio link quality by calculating correlation of the radio link quality at prescribed time intervals.