摘要
针对认知无线网络中主用户行为将导致频谱瞬时变化而影响路由稳定性的问题,提出了一种基于主用户行为的路由和信道联合分配算法。该算法通过采用呼叫模型对主用户行为建模,并根据动态源路由协议的路由寻找机制,在目的节点等待多个路由请求分组后选择受主用户行为影响最小的路由,然后沿着所选定路径的反方向传送路由回复分组并完成信道分配。理论分析证明了算法中的链路平均持续时间期望与主用户活动概率成反比且具有与网络节点数成正比的计算复杂度。仿真结果表明,该算法具有比Gymkhana路由方案更高的分组投递率和更低的平均分组时延。
To resolve the unstable routing problem due to the variation of spectrum availability caused by primary users’ behaviors in cognitive radio networks（CRN）,a primary-user behavior based joint routing and channel allocation（PUB-JRCA） algorithm was proposed.The PUC-JRCA algorithm characterized the primary-user behavior by using the call-based model.According to the route discovery mechanism in the dynamic source routing protocol,the destination node selected the route which received the least impact from primary-user behaviors after receiving a number of route requests.Then,the destination sent back the route reply packet（RREP） along the selected route,and the channel alloca-tion was performed when the RREP passed each node on this route.Theoretic analyses prove that the expected available transmission time for the packet delivery is inversely proportional to the probability that PU is active.Moreover,the computational complexity of the proposed algorithm is proportional to the number of nodes in the CRN.Simulation re-sults show that the proposed algorithm has higher packet delivery ratio and lower average packet delay than the Gym-khana routing scheme.
出处
《通信学报》
EI
CSCD
北大核心
2011年第11期183-190,共8页
Journal on Communications
基金
国家自然科学基金重点资助项目(60832007)
国家自然科学基金资助项目(61102082)
国家高技术研究发展计划("863"计划)基金资助项目(2009AA011801)
国家科技重大专项基金资助项目(2010ZX03005-003)
东南大学移动通信国家重点实验室开放研究基金资助课题(2011D14)~~
关键词
认知无线网络
主用户行为
路由
信道分配
cognitive radio networks
primary-user behavior
routing
channel allocation
