Cooperative HARQ implementation strategy based on CQI
基于CQI辅助的协作HARQ实现策略*

In traditional cooperative HARQ communication system,signal from source and relay would be maximal ratio combined by destination.However,turbo decoding that consumes a large number of UE’s time and power is very complicated.The decoding will directly cause delay of the system when destination requires retransmission after decoding fails.To solve this problem,this paper introduced the channel quality information(CQI) to assist the HARQ decoding,and proposed an auxiliary threshold adaptive set method.It judged the quality of packet before decoding by the scheme,in order to determine whether directly decode the packet or skip the decoding and feedback NACK,for reducing transfer delay.At the same time,solving the difficulty of accurately setting the auxiliary channel threshold in the CQI auxiliary relay HARQ scheme.At last,analyzed the performance of the CQI auxiliary relay HARQ scheme such as delay,package error rate and so on,it is verified that the CQI auxiliary relay HARQ scheme has a better delay performance.