摘要： 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。
关键词:
长期演进,
混合自动重传请求,
反馈算法,
信道质量指示,
空口质量,
误块率
Abstract: 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.
Key words:
Long Term Evolution ( LTE ),
hybrid automatic repeat request,
feedback algorithm,
Channel Quality
Indicator(CQI),
air interface quality,
Block Error Rate(BLER)
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