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工程科学与技术:2013,45(6):116-122
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认知无线电中一种频谱聚合的切换策略
(哈尔滨工业大学 通信技术研究所)
A Handoff Strategy of Spectrum Aggregation in Cognitive Radio System
(Communication Research Center,Harbin Inst. of Technol.)
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投稿时间:2013-04-12    修订日期:2013-07-19
中文摘要: 针对认知无线电频谱聚合系统下降低频谱切换延迟、减少频谱切换次数的问题,提出一种主动式频谱切换策略。该策略在频谱聚合跨度的限制下,根据认知用户工作状态转移概率,制定其频谱切换的规则,以达到认知用户在利用频谱聚合技术的同时,实现平滑切换并避免与主用户发生碰撞的目的。另外,在此基础上提出了一种基于切换概率的候选信道选择方法,用来进一步降低频谱切换延迟和频谱切换次数。仿真结果显示当主用户到达的平均时间间隔高于50时隙,并且认知用户子信道的平均服务保持时间小于100时隙时,频谱聚合切换策略能将切换次数稳定在5次以下,同时将切换延迟降低到30时隙以下。仿真结果表明该策略既保证良好的实时性又尽量的减少由切换次数带来的系统开销,从而提高系统效率。
Abstract:In cognitive radio system, it was still a problem for a secondary user that how the delay and the number of spectrum handoff could be reduced so as to realize transmitting information of numerous data by utilizing spectrum aggregation when the primary user returned. A proactive handoff strategy was proposed and applied to the spectrum aggregation to solve this problem. According to the transition probability of the secondary user and the constraint of span, the strategy formulated a new regulation for proactive handoff of the secondary user to ensure smoothing handoff and to avoid the collision. Meanwhile,a backup channel selection method based on handoff probability was advised to cut down spectrum handoff delay and handoff number. Simulation results showed that when the average interval of PUs’ arrivals was higher than 50 slots and average holding time in a sub-channel of the SU was less than 100 slots, the handoff strategy of spectrum aggregation could keep the number of handoff below 5 times and shorten the delay below 30 slots. The strategy not only guaranteed the real-time of handoff but also reduced the cost of handoff as much as possible to promote the efficiency of system.
文章编号:201300318     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目( 61071104 );国家科技重大专项资助项目(2011ZX03004-004);国家“863”计划资助项目(2012AA120802)
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引用文本:
殷聪,谭学治,马琳,于洋.认知无线电中一种频谱聚合的切换策略[J].工程科学与技术,2013,45(6):116-122.
Yin Cong,Tan Xuezhi,Ma Lin,Yu Yang.A Handoff Strategy of Spectrum Aggregation in Cognitive Radio System[J].Advanced Engineering Sciences,2013,45(6):116-122.