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研究和仿真了HSDPA系统中分组调度算法(RR,Max C/I和PF)的系统吞吐量和用户公平性,仿真结果与理论分析表明在HSDPA系统中RR算法调度结果的公平性略逊于PF算法。为了补偿正比公平调度算法公平性,提出了依赖负载的正比公平(LDPF)调度算法。该算法旨在通过低负载时牺牲系统吞吐量换取用户间公平性。然后用扩展了爱立信EU-RANE模块的NS2网络仿真软件对LDPF算法进行了仿真。仿真结果表明LDPF调度算法在系统低负载时有效地补偿了先前的低速率用户,通过这种低负载和高负载时的时间分集,改善用户间的长时公平性。
The system throughput and user fairness of packet scheduling algorithm (RR, Max C / I and PF) in HSDPA system are studied and simulated. The simulation results and theoretical analysis show that the fairness of RR algorithm scheduling result is slightly lower than that of PF in HSDPA system algorithm. In order to compensate fairness of proportional fair scheduling algorithm, a load-dependent proportional fairness (LDPF) scheduling algorithm is proposed. The algorithm is designed to sacrifice system throughput at low loads in exchange for fairness among users. Then the LDPF algorithm is simulated with NS2 network emulation software which expands Ericsson EU-RANE module. The simulation results show that the LDPF scheduling algorithm effectively compensates for the previous low-rate users when the system is under a low load, and improves the long-term fairness between users through this time diversity with low load and high load.