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1.
提出一种新的基于网络编码的负载均衡路由量度CRM-LB(coding-aware routing metric with load balancing),CRM-LB在CRM(coding-aware routing metric)的基础上增加了对路径p上所有节点通信密集程度与网络拥塞程度的考虑。进一步提出了基于CRM-LB的无线mesh网络多播路由CLR(coding and load-balancing routing)。该协议可以增加网络编码机会,同时考虑到网络中的负载均衡。通过性能分析和仿真实验表明,该协议在提高多播吞吐量的前提下,不仅能更好地支持网络编码,而且网络负载基本均衡。  相似文献   

2.
无线mesh网中网络编码感知的按需无线路由协议的研究   总被引:3,自引:0,他引:3  
樊凯  李令雄  龙冬阳 《通信学报》2009,30(1):128-134
提出一个支持无线网络编码技术COPE的按需路由协议OCR,以提高无线mesh网中的网络吞吐量.在路由发现过程中,该协议主动地探测编码机会并灵活地寻求\"增加编码机会\"、\"最短路径\"以及\"避免拥塞\"之间的折衷.仿真结果表明OCR能够有效地发现编码机会,进而使得网络拥有更高的吞吐量.  相似文献   

3.
提出了一种适合目的节点动态加入的、时延受限低代价多播路由的启发式算法DLHMA算法。该算法基于MPH算法的基本思想进行扩展,在满足时延限制条件和多播树代价增加最小的基础上,逐步将目的节点添加到多播树上。最后,证明了算法的正确性,分析了算法的动态性,并进行了仿真实验。结果表明,该算法可以实现新加目的节点的动态加入,并保证所获得多播树的低代价。  相似文献   

4.
时延和时延抖动约束的低费用多播路由算法   总被引:3,自引:0,他引:3  
为了有效支持交互式实时组播业务,不仅要考虑时延约束,而且要考虑时延抖动约束,同时还需高效管理网络资源,以降低多播费用。本文提出了一种新的时延和时延抖动约束的低费用我播路由启发式算法,仿真结果表明该算法复杂度较低,时延抖动较小,又降低了网络费用,是一种快速有效的多播路由算法。  相似文献   

5.
无线mesh网中一种基于博弈论的公平性路由协议   总被引:1,自引:0,他引:1  
提出一种基于博弈论的以树为拓扑结构的公平性路由协议.新的协议综合了先验式路由和按需路由,并且将路由计算和信道资源分配控制分布到树中的每个枝节点上,降低了根节点的负担,使其更适合于无线 mesh网的通信需求.仿真结果表明,新的路由协议改进了AODV、HWMP路由协议的端到端平均延迟和网络吞吐量,并且网络中各个无线节点占有的信道资源基本相近,满足公平性原则.  相似文献   

6.
分布式多网关无线mesh网公平协作路由算法   总被引:2,自引:0,他引:2  
乔宏  张大方  谢鲲  何施茗  张继 《通信学报》2015,36(2):175-185
现有的协作路由协议不能公平地分配无线网络资源,无法满足网络最小流的吞吐量需求。将多并发流的协作路由问题形式化成一个最大化网络整体效用的凸优化问题,并基于对偶分解和子梯度,提出一种分布式的多网关无线mesh网公平协作路由算法FCRMG。实验结果表明,与基于期望传输时间的非协作路由和基于竞争感知的协作路由相比,FCRMG算法在保证网络吞吐量的前提下,能显著提高最小业务流的吞吐量。  相似文献   

7.
最小代价多播生成树的快速算法   总被引:9,自引:2,他引:9       下载免费PDF全文
本文针对MPH(Minimum Path Cost Heuristic)等多播最小生成树算法存在的问题,通过改进最短路径节点的搜寻过程,以较小的存储空间为代价,获得了计算效率很高的快速最小代价多播生成树算法FMPH(Fast Minimum Path Cost Heuristic),且获得多播生成树与MPH算法完全相同,随机网络模型的仿真结果表明:FMPH算法快速、稳定,是一种值得推广使用的高效算法。  相似文献   

8.
9.
乔宏  张大方  谢鲲  何施茗  张继 《电子学报》2016,44(6):1400-1405
现有的协作路由算法没有考虑多射频无线mesh网中的信道分配问题.为了给多并发业务流提供更优质的网络服务,本文结合多射频多信道技术和协作通信技术来降低同信道干扰并获得协作分集增益.基于协作通信模块虚拟化的方法,本文将联合协作路由和信道分配问题简化为联合直接路由和信道分配问题,将其建模为一个混合整数线性规划问题,并证明该问题为NP-hard问题.为了解决该问题,提出了一种宽松的联合协作路由选择和信道分配算法(Loose Joint Cooperative Routing and Channel Assignment algorithm,L-JCRCA).仿真实验结果表明,L-JCRCA可以有效提升网络整体吞吐量.  相似文献   

10.
无线网络编码增益感知的低时延路由协议   总被引:1,自引:0,他引:1  
降低无线网络数据包传递时延对实时应用有重要的意义.该文提出了一种编码增益的计算方法和编码图的简化方法,并基于此提出了编码增益感知的路由协议CGAR(Coding Gain Aware Routing).CGAR利用网络编码增益和无线链路的期望传输次数ETX(Expected Transmission Count)计算传递一个来自新流的数据包所需要的时间,并以此为选路度量,旨在降低数据传递时延.仿真试验表明,CGAR的时延优于COPE和DCAR协议.  相似文献   

11.
李盼盼  洪佩琳 《通信技术》2009,42(9):148-150
针对无线链路的不可靠性和物理层的广播特性,将网络编码与无线网络相结合,提出一种基于流的无线网络编码算法——FNC。该算法在先验参考路径的基础上,充分利用每个节点处的路由表项,探测编码机会,在有编码机会的节点对满足编码条件的数据流进行网络编码,达到提高网络吞吐量的目的。仿真结果表明:FNC有效提高了整个网络的吞吐量,改善了网络性能。  相似文献   

12.
无线Mesh网络中的组播机会路由研究   总被引:2,自引:0,他引:2  
 针对无线Mesh网络组播中包丢失严重的问题,提出了保持包的IP层不变,而改变包的目的MAC域,进而MAC层以单播形式向组成员发送包的M2U(Multicast to Unicast) 优化解决方案.为了满足组成员增加时不影响用户的性能,提出在M2U中引入了机会路由的M2UO(Multicast to Unicast Opportunistic Routing)算法,对候选节点采用单播形式发送包,对其它节点采用组播形式发送包.在实际网络环境中的大量实验表明,优化组播减小了数据包的丢失率,提高了网络的吞吐量,具有较好的组播视频流效果.  相似文献   

13.
In this paper, we investigate the routing optimization problem in wireless mesh networks. While existing works usually assume static and known traffic demand, we emphasize that the actual traffic is time-varying and difficult to measure. In light of this, we alternatively pursue a stochastic optimization framework where the expected network utility is maximized. For multi-path routing scenario, we propose a stochastic programming approach which requires no priori knowledge on the probabilistic distribution of the traffic. For the single-path routing counterpart, we develop a learning-based algorithm which provably converges to the global optimum solution asymptotically.
Yuguang FangEmail:

Yang Song   received his B.E. and M.E. degrees in Electrical Engineering from Dalian University of Technology, Dalian, China, and University of Hawaii at Manoa, Honolulu, U.S.A., in July 2004 and August 2006, respectively. Since September 2006, he has been working towards the Ph.D. degree in the Department of Electrical and Computer Engineering at the University of Florida, Gainesville, Florida, USA. His research interests are wireless network, game theory, optimization and mechanism design. He is a student member of IEEE a member of Game Theory Society. Chi Zhang   received the B.E. and M.E. degrees in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, China, in July 1999 and January 2002, respectively. Since September 2004, he has been working towards the Ph.D. degree in the Department of Electrical and Computer Engineering at the University of Florida, Gainesville, Florida, USA. His research interests are network and distributed system security, wireless networking, and mobile computing, with emphasis on mobile ad hoc networks, wireless sensor networks, wireless mesh networks, and heterogeneous wired/wireless networks. Yuguang Fang   received a Ph.D. degree in Systems Engineering from Case Western Reserve University in January 1994 and a Ph.D degree in Electrical Engineering from Boston University in May 1997. He was an assistant professor in the Department of Electrical and Computer Engineering at New Jersey Institute of Technology from July 1998 to May 2000. He then joined the Department of Electrical and Computer Engineering at University of Florida in May 2000 as an assistant professor, got an early promotion to an associate professor with tenure in August 2003 and to a full professor in August 2005. He holds a University of Florida Research Foundation (UFRF) Professorship from 2006 to 2009 and a Changjiang Scholar Chair Professorship with National Key Laboratory of Integrated Services Networks, Xidian University, China, from 2008 to 2011. He has published over 200 papers in refereed professional journals and conferences. He received the National Science Foundation Faculty Early Career Award in 2001 and the Office of Naval Research Young Investigator Award in 2002. He is the recipient of the Best Paper Award in IEEE International Conference on Network Protocols (ICNP) in 2006 and the recipient of the IEEE TCGN Best Paper Award in the IEEE High-Speed Networks Symposium, IEEE Globecom in 2002. Dr. Fang is also active in professional activities. He is a Fellow of IEEE and a member of ACM. He has served on several editorial boards of technical journals including IEEE Transactions on Communications, IEEE Transactions on Wireless Communications, IEEE Transactions on Mobile Computing and ACM Wireless Networks. He has been actively participating in professional conference organizations such as serving as the Steering Committee Co-Chair for QShine, the Technical Program Vice-Chair for IEEE INFOCOM’2005, Technical Program Symposium Co-Chair for IEEE Globecom’2004, and a member of Technical Program Committee for IEEE INFOCOM (1998, 2000, 2003–2009).   相似文献   

14.
组播技术是无线Mesh网的关键技术之一,它可以大大提高信息的传播效率。介绍了信息组播的主要步骤,指出蚁群算法是构建路由组播树的高效启发式算法。对传统的蚁群算法进行定性分析,并对其进行改进,在计算路径费用以及信息素更新时考虑路径上的目的节点个数,路径上的目的节点数越多,其信息素增长速率越快。两个例子的仿真结果表明,该改进算法与传统蚁群算法相比分别使费用和代价减少了28.57%和22.36%,改善了系统性能。  相似文献   

15.
多播路由算法MPH的时间复杂度研究   总被引:2,自引:0,他引:2  
蒋廷耀  李庆华 《电子学报》2004,32(10):1706-1708
多播通信是从一个源点同时向网络中的多个成员发送分组的通信服务,一个最小代价的多播路由算法是NP完全的,在时间敏感的应用中其运行时间是一个关键问题.MPH(Minimum Path Cost Heuristic)算法是一个著名的启发式最小代价多播路由算法,本文对该算法进行了理论分析和证明,并做了广泛的仿真实验,结果表明其时间复杂度是O(m2n)而不是过去文献中所给出的O(m2n+e).  相似文献   

16.
    
Because of the broadcast and overhearing capability of wireless networks, network coding can greatly improve throughput in wireless networks. However, our investigation of existing inter‐session network coding protocols found that the short‐term unfairness that existed in 802.11‐based medium access control (MAC) protocols actually decreases the coding opportunity, which in turn compromises the throughput gain of network coding. To alleviate the negative impact of this unfairness, we propose a coding‐aware cross‐layer heuristic approach to optimize the coordination of network coding and MAC layer protocol, named FairCoding, which can significantly increase coding opportunities for inter‐session network coding through a fair short‐term traffic allocation for different coding flows. Experiment evaluation shows that the proposed mechanism can bring more coding opportunities and improve the total throughput of wireless mesh networks by up to 20%, compared with the coding mechanism, without considering the negative impact of the short‐term unfairness. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

17.
无线Mesh网络路由协议研究   总被引:1,自引:0,他引:1  
无线Mesh网络WMN(wireless mesh networks)是一种新型的无线网络,它融合了无线局域网(WLAN)和Ad Hoc网络的优势,成为宽带接入的一种有效手段。首先介绍了无线Mesh网的网络结构和特点.并在此基础上讨论了无线Mesh网络对路由协议的要求。无线Mesh网络的路由算法是Mesh领域的研究难点,通过分析比较4种针对WMN的路由协议,总结了现有的路由协议的优缺点,并对今后的研究方向做出了展望。  相似文献   

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