TD-LTE系统中ACK复用反馈算法研究

摘要

When the users adopt the HARQ ACK/NACK Multiplexing model feedback in TD-LTE, the PUCCH channel carries feedback results,which sometimes are ambiguous. So evolved Node B(eNB) cannot obtain the exact feedback results. Therefore, this paper puts forward a method called ACK/NACK multiplexing feedback results judgment algorithm based on User Equipment( UE) air interface quality, which judges the ambiguous feedback results to be more accurate. In the scheduling system, UE reports CQI/PMI/RI parameters as characterizations of UE air quality to eNB. And eNB amends reported CQI parameters, based on the parameters of each UE and the received UE Block Error Rate( BLER) , which are output to the packet scheduler to decide which UE to be scheduled in next scheduling period. And through the corresponding platform simulations it proves that the algorithm can decrease BLER and increase the system throughput.%当TD-LTE系统中用户使用ACK/NACK Multiplexing模式进行HARQ反馈时，在PUCCH信道上承载反馈结果，反馈结果的取值存在二义性，使得演进型基站( eNB)无法获取确切的反馈结果。为此，提出一种基于终端( UE)空口质量的ACK/NACK Multiplexing反馈结果判决算法。 eNB根据每个UE上报的CQI/PMI/RI等表征UE空口质量的参数，并结合eNB监控的UE数据发送和接收误块率，对上报的CQI参数进行修正，将经过处理后的CQI反馈参数输出至分组调度器。对存在二义性的反馈结果进行判决，以便获取较准确的反馈结果。相应的平台仿真结果表明，该算法能够降低系统误块率，增加系统吞吐量。