针对短波认知电台在网络高负载情况下频点冲突严重的问题,依据短波频点衰落特性,结合真实在线双拍卖模型,提出了基于冲突分解的真实在线双拍卖(trueful online double auction based on conflict decomposition,TODA-CD)模型。在TODA-C...针对短波认知电台在网络高负载情况下频点冲突严重的问题,依据短波频点衰落特性,结合真实在线双拍卖模型,提出了基于冲突分解的真实在线双拍卖(trueful online double auction based on conflict decomposition,TODA-CD)模型。在TODA-CD模型中,卖家模型考虑不同链路间差异性,重构卖家定价模型,提升了链路可靠性;买家模型以预期收益最大化为优化目标,首先利用广度优先搜索算法生成频点冲突树,解析短波认知网络内频点冲突关系,然后设置频点抢占切换惩罚函数,计算不同切换方案预期收益,重构买家竞拍价格,以第二密封价格拍卖完成频谱交易,最终实现网络内频点指配的抢占最优。仿真结果表明,在网络高负载情况下,TODA-CD算法能够有效提高频谱利用率,降低抢占切换次数,从而提高系统收益。展开更多
Since FCC's opening for white space(WS) utilization,database-assisted dynamic spectrum access(DSA) has become the de facto solution for the realization of dynamic spectrum sharing(DSS),due to its simplicity and co...Since FCC's opening for white space(WS) utilization,database-assisted dynamic spectrum access(DSA) has become the de facto solution for the realization of dynamic spectrum sharing(DSS),due to its simplicity and compatibility with commercial off-the-shelf(COTS) devices.It is envisioned that such technology will strongly support the prosperous wireless multimedia networking(WMN) applications with satisfying QoS guarantees in the future.However,how to counter the time-frequency variant property when exploiting the WS spectrum for the provision of these services to secondary users(SUs) still remains a great challenge.In such context,a dynamic secondary access scheme for database-assisted spectrum sharing networks is proposed in this paper.In the beginning,the spectrum requirements of SUs for diverse services are modeled by considering the minimum required service data-rate and spectrum access duration.Afterwards,the spectrum demand evaluation and bidding policy are formulated based on the service classes of SUs.Furthermore,a doublephase(DP) spectrum allocation scheme,which consists of the initial resource allocation phase and resource allocation adjustment phase,is carefully designed for DSA.Finally,extensive simulations are conducted and the results demonstrate that our scheme can increase the spectrum trading revenue and adapt to varying service requirements.展开更多
文摘针对短波认知电台在网络高负载情况下频点冲突严重的问题,依据短波频点衰落特性,结合真实在线双拍卖模型,提出了基于冲突分解的真实在线双拍卖(trueful online double auction based on conflict decomposition,TODA-CD)模型。在TODA-CD模型中,卖家模型考虑不同链路间差异性,重构卖家定价模型,提升了链路可靠性;买家模型以预期收益最大化为优化目标,首先利用广度优先搜索算法生成频点冲突树,解析短波认知网络内频点冲突关系,然后设置频点抢占切换惩罚函数,计算不同切换方案预期收益,重构买家竞拍价格,以第二密封价格拍卖完成频谱交易,最终实现网络内频点指配的抢占最优。仿真结果表明,在网络高负载情况下,TODA-CD算法能够有效提高频谱利用率,降低抢占切换次数,从而提高系统收益。
基金supported in part by Major State Basic Research Development Program of China(973 Program)(No.2009CB320403)National Natural Science Foundation of China(61420106008,61221001, 61201222,61100213)+5 种基金the 111 Project (B07022)China Scholarship CouncilShanghai Key Laboratory of Digital Media Processing and Transmissionsthe funds of MIIT of China(Grant No.2011ZX03001-007-03)Research Grant SRG030-FST13-HF from the University of Macaothe NSERC,Canada
文摘Since FCC's opening for white space(WS) utilization,database-assisted dynamic spectrum access(DSA) has become the de facto solution for the realization of dynamic spectrum sharing(DSS),due to its simplicity and compatibility with commercial off-the-shelf(COTS) devices.It is envisioned that such technology will strongly support the prosperous wireless multimedia networking(WMN) applications with satisfying QoS guarantees in the future.However,how to counter the time-frequency variant property when exploiting the WS spectrum for the provision of these services to secondary users(SUs) still remains a great challenge.In such context,a dynamic secondary access scheme for database-assisted spectrum sharing networks is proposed in this paper.In the beginning,the spectrum requirements of SUs for diverse services are modeled by considering the minimum required service data-rate and spectrum access duration.Afterwards,the spectrum demand evaluation and bidding policy are formulated based on the service classes of SUs.Furthermore,a doublephase(DP) spectrum allocation scheme,which consists of the initial resource allocation phase and resource allocation adjustment phase,is carefully designed for DSA.Finally,extensive simulations are conducted and the results demonstrate that our scheme can increase the spectrum trading revenue and adapt to varying service requirements.