下行信道质量受控反馈算法与调度算法的研究
A study on the downlink channel quality feedback control algorithm and scheduling algorithm
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摘要: 该文先介绍了在第三代移动通信技术体制cdma2000 1xEV-DO/DV中的下行信道质量反馈机制；然后提出了一种新的反馈控制算法，并结合一种综合考虑吞吐量和公平度的调度算法(正比公平调度算法)进行了分析与仿真。通过与未采用该策略的调度算法结果相比较，显示了新的算法在保持公平度的条件下能够提高系统吞吐量，同时减少了移动台的功耗，这种新的算法应用灵活，其策略对其它需要对共享资源调度的领域也有意义。
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关键词:
- CDMA; 信道质量; 反馈; 调度算法
Abstract: At first, in this paper, the feedback mechanisms of downlink channel quality for cdma2000 IxEV-DO/DV, a 3G technical proposal, are described briefly. Then a new feedback control algorithm is presented and integrated with proportional fair scheduling algorithm. The modified scheduling algorithm is studied by analysis and simulation. It is shown that this new algorithm can bring some significant improvements over the ordinary scheduler without feedback control in terms of system throughput, leaving no harm on fairness. In addition, the new algorithm will be helpful to reduce the power consumption of mobile terminals. The fundamental strategy underlying this new algorithm will be useful to other application fields where shared resources are needed to be scheduled. -
3GPP2, Physical Layer Standard for cdma2000 Spread Spectrum Systems, C. S0002-A, Version5.0.[2]3GPP2, cdma2000 High Rate Packet Data Air Interface Specification, C. S0024, Version 2.0. ［3］LG, LSI, Lucent, Qualcomm, and Samsung (L3QS), Updated Joint Physical Layer Proposal for 1xEV-DV, contribution 3GPP2-C50-20010611-009-L3QS-Updated-PL-Text.[3]A. Jalali, R. Padovani, R. Pankaj, Data throughput of CDMA-HDR, a high efficiency data rate personal communication wireless system, Proc. VTC2000-Spring, Tokyo, May, 2000, 1854-1858.J.M. Holtzman, CDMA forward link watertilling power control Proc. VTC2000-Spring, Tokyo,May, 2000, 1663-1667.[4]T.S. Rappaport, Wireless Communications Principles and Practice, New Jersey, Prentice Hall,Inc., 1996, 172-174.[5]A.J. Viterbi, CDMA: Principlcs of Spread Spectrum Conmunication Massachusetts, AddisonWesley Publish Company, 1995, 178-182.[6]3GPP2, 1xEV-DV Evaluation Methodology Addendum (V4), C50-20010709-021R1-1xEV-DV-Evaluation-Methodology-Addendun- V4.[7]事实上闭环功率控制也需要反馈,所不同的是它应用于速率基本恒定的信道,本文不对此重点研究.[8]与1xEV-DO不同,1xEV-DV中下行采用的是时间连续的码分导频. -
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