下行信道質(zhì)量受控反饋算法與調(diào)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: 該文先介紹了在第三代移動(dòng)通信技術(shù)體制cdma2000 1xEV-DO/DV中的下行信道質(zhì)量反饋機(jī)制；然后提出了一種新的反饋控制算法，并結(jié)合一種綜合考慮吞吐量和公平度的調(diào)度算法(正比公平調(diào)度算法)進(jìn)行了分析與仿真。通過(guò)與未采用該策略的調(diào)度算法結(jié)果相比較，顯示了新的算法在保持公平度的條件下能夠提高系統(tǒng)吞吐量，同時(shí)減少了移動(dòng)臺(tái)的功耗，這種新的算法應(yīng)用靈活，其策略對(duì)其它需要對(duì)共享資源調(diào)度的領(lǐng)域也有意義。
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關(guān)鍵詞:
- CDMA; 信道質(zhì)量; 反饋; 調(diào)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]事實(shí)上閉環(huán)功率控制也需要反饋,所不同的是它應(yīng)用于速率基本恒定的信道,本文不對(duì)此重點(diǎn)研究.[8]與1xEV-DO不同,1xEV-DV中下行采用的是時(shí)間連續(xù)的碼分導(dǎo)頻. -
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