Patent ID: 8205129

Claim:
An apparatus for operating a hybrid retransmission scheme for a communication to a first subscriber unit over a communication channel of an air interface of a cellular communication system, the apparatus comprising: means for determining a measured error rate indication of transmissions to the first subscriber unit; setting means for setting a transmission parameter for a transmission of the communication in response to an error rate target for the retransmission scheme; means for determining channel quality indications for the communication channel; means for determining a rate of change measure of a variation of the channel quality indications; and means for setting the error rate target in response to the rate of change measure of the channel quality indications; wherein the means for determining the rate of change of a variation of the channel quality indications is determined by: VarMeas( k )=λ*VarMeas( k− 1)+(1−λ)* abs (CQI( k )−CQI( k− 1)) where VarMeas is the rate of change measure, CQI indicates the channel quality measure and λ is a predetermined parameter and k is an index.