Abstract: This paper analyzes and studies three classical packet scheduling algorithm RR，Max C/I and PF in system throughput and user fairness，which support non-real time services in HSDPA system.In connection with the problem of long retransmission delays in PF algorithm，this paper proposes an enhanced packet scheduling algorithm combined with hybrid automatic request.The proposed algorithm can increase the priority and reduce retransmission delay of a UE that has HARQ retransmission packets，effectively improve the utilization of resource.MATLAB simulation results display the proposed algorithm can maintain user fairness and system throughput when reduce retransmission delay.

Key words: High Speed Downlink Packet Access, packet scheduling algorithm, proportional fairness algorithm, retransmission delay

摘要： 从系统吞吐量、用户公平性等方面分析研究了HSDPA系统中支持非实时业务的三种经典分组调度算法RR、Max C/I和PF。针对PF算法重传时延过长问题，提出了一种结合混合自动请求重传HARQ的增强分组调度算法。该算法通过提高重传分组的优先级降低重传时延，有效地避免系统资源的浪费。MATLAB仿真结果表明，该算法在降低单用户重传时延的同时，仍能保证用户间的公平性和系统的吞吐量。

关键词: 高速下行链路分组接入, 分组调度算法, 正比公平调度算法, 重传时延