共查询到20条相似文献,搜索用时 15 毫秒
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节约能量的负载平衡路由(PELBR)协议是针对无线Adhoc网络提出的一种路由协议。PELBR定义了一种称为节点活动度的标准,节点活动度定义了节点的通信负载。在PELBR中,路由发现过程中目标节点从候选路径中寻找负载最小,即路径上活动度之和最小的路径;而节点在传送数据时适当调节能量以保证网络拓扑结构的连接性,同时节约电池能量从而延长节点的工作时间。 相似文献
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无线Ad Hoc网络中高效利用能源的QoS路由协议 总被引:1,自引:0,他引:1
本文基于无线AdHOC网络的特性,提出了适用于无线AdHOC网络的路由协议CEQRP(Cost-Efficient QoS Routing Protocol),该协议不仅能为应用层提供QOS保证,而且能充分利用网络中剩余能量高的节点来中转分组.从而达到有效利用节点的电能、提高网络“寿命”的目的。在仿真研完中,我们考虑了在不同虚电路数以及不同QoS要求的情况下,各节点采用CEQRP和QRP(QoS Routing Protocol,选择路由时除不考虑节点剩余电能,其它方面与CE-QRP相同)时的网络性能。结果表明,在中等业务强度下,CEQRP与QRP郝具有较好的网络性能.而且CEQRP在有效利用节点电能方面性能优越。 相似文献
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Chun-Yuan Chiu Yu-Liang Kuo Wu E.H.-K. Gen-Huey Chen 《Parallel and Distributed Systems, IEEE Transactions on》2008,19(1):4-14
The bandwidth-constrained routing problem (BCRP) asks for a route that has sufficient bandwidth for data transmission. When BCRP is defined for wired networks, it can be solved in polynomial time. On the other hand, when it is defined for wireless ad hoc networks, it is NP-complete if the underlying MAC protocol is TDMA-based or CDMA-over-TDMA-based. In this paper, we show that BCRP is still NP-complete, even if CSMA-based or contention-based CDMA MAC prot.ocols are used. Besides, we show that BCRP is polynomial-time solvable if the channel model is collision-free and the scheduling policy is FIFO. In wireless ad hoc networks, no MAC protocol was designed before, which would lead to a polynomial-time solution to BCRP. The results of this paper suggest a design for MAC protocols that can support QoS routing well. 相似文献
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Byung Joon Oh Chang Wen Chen 《Multimedia, IEEE Transactions on》2009,11(6):1052-1061
This paper presents a cross-layer design for a reliable video transmission over wireless ad hoc networks based on multichannel MAC protocol with TDMA. First, we conduct a study of the multichannel MAC protocol through Markov chain model. Based on this study, two novel cross-layer modules are adopted for the design of multichannel MAC protocol. First, we adopt maximum latency rate (MLR) as the channel quality metric. Unlike the traditional MAC design based on network allocation vector (NAV), MLR is implemented to provide differentiated traffic so that the channel with smaller MLR time is initiated for higher priority traffic. Second, we adopt two congestion-aware metrics, namely MAC utilization and queue length of MAC layer, to improve the congestion-aware routing protocols with AODV and DSR. These two novel modules allow the proposed MAC protocol design to achieve high performance video transmission over wireless ad hoc networks. Experimental results show that the proposed scheme outperforms the state-of-the-art schemes under multichannel environments in wireless ad hoc networks for as much as 3.6 dB in PSNR. Such significant performance enhancement confirms that the cross-layer approach is very effective for multichannel MAC protocol design. 相似文献
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An efcient hop count route fnding approach for mobile ad hoc network is presented in this paper.It is an adaptive routing protocol that has a tradeof between transmission power and hop count for wireless ad hoc networks.During the route fnding process,the node can dynamically assign transmission power to nodes along the route.The node who has received route request message compares its power with the threshold power value,and then selects a reasonable route according to discriminating algorithms.This algorithm is an efective solution scheme to wireless ad hoc networks through reasonably selected path to reduce network consumption.Simulation results indicate that the proposed protocol can deliver better performances with respect to energy consumption and end-to-end delay. 相似文献
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无线Ad Hoc 网络最大生命周期路由算法的诚实机制 总被引:2,自引:0,他引:2
将已有的生命周期路由算法分成两类:普通Max-Min(GMM)算法和条件Max-Min(CMM)算法,然后为这两类算法分别提出它们的诚实机制.通过给予中继节点适当的报酬,这些诚实机制可以确保已有的算法在面对自私节点的时候也可以实现它们的设计目标.说明生命周期路由算法的本质可以使这种报酬率相对较低且比较稳定,实验结果也进一步证明了这一点. 相似文献
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Luiz Carlos P. Albini Antonio Caruso Stefano Chessa Piero Maestrini 《Journal of Network and Systems Management》2006,14(3):335-358
A novel routing protocol for wireless, mobile ad hoc networks is presented. This protocol incorporates features that enhance routing reliability, defined as the ability to provide almost 100% packet delivery rate. The protocol is based on a virtual structure, unrelated to the physical network topology, where mobile nodes are connected by virtual links and are responsible for keeping physical routes to their neighbors in the virtual structure. Routes between pairs of mobiles are set up by using information to translate virtual paths discovered in the virtual structure. Route discovery and maintenance phases of the protocol are based on unicast messages travelling across virtual paths, with sporadic use of flooding protocol. Most flooding is executed in the background using low priority messages. The routing protocol has been evaluated and compared with the Dynamic Source Routing protocol and with the Zone Routing Protocol by means of simulation.
相似文献
Piero MaestriniEmail: |
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提出了基于网络分簇和多路径的自组织网络匿名通信协议(CMAR),该协议中节点首先在不暴露身份信息的情况下,利用双线性配对技术生成和邻居节点共享的密钥,并以此为基础,秘密地建立用于成员节点和簇头节点之间通信的簇内路由表项,在簇内路由表项的辅助下,完成源节点和目标节点之间多路径的匿名建立,以及数据报文的匿名转发。通过性能分析可以发现,CMAR协议的密码学运算负荷较低,且网络通信性能良好。 相似文献
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无线多跳自组网络视频传输研究的综述 总被引:1,自引:0,他引:1
通过讨论无线多跳自组网络视频传输所面临的挑战,分别从视频编码、媒体接入控制协议、调度算法、路由协议和传输协议以及跨层设计等方面,对现存的无线多跳自组织网络中视频传榆的典型方案进行了简要的评估,并总结了该方向上的进一步研究热点. 相似文献
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Romit Roy Choudhury Krishna Paul Somprakash Bandyopadhyay 《Autonomous Agents and Multi-Agent Systems》2004,8(1):47-68
Supporting mobility in a multi hop wireless environment like the MANET still remains a point of research, especially in the context of time-constrained applications. The incapacity of ad hoc networks to offer services of the likes of static or infratructured networks may be attributed to two major reasons. One, unpredictable mobility of hosts cause location-transparent-packet-delivery to be implemented only at the expense of large control overhead. Two, the lack of central control causes connection management and scalability to be major problems in the multi hop environment. In this paper we propose an efficient agent based routing mechanism that not only incurs minimal overhead, but also lays the foundation for additional functionalities as network management and real time applications. In other words, we show that the agent framework makes the MANET robust and survivable under stringent system constraints. 相似文献
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移动自组网DSR协议路径缓存策略优化 总被引:1,自引:1,他引:0
移动自组网按需机制路由协议只是在有分组发送时,才启动路径发现机制搜索到达目的节点的路径。为了避免每发送一个分组都启动路由发现机制,必须利用路由保存机制将预先发现的路径缓存。对这些路径进行缓存、搜索、抛弃的管理策略极大地影响按需机制路由协议的性能。该文对多次性能测试中表现优越的DSR协议路由缓存策略进行分析,针对它的不足,提出改进算法。提出修正发送缓冲器的时限,根据最近路径失效时间和缓冲器中路径状况预测将来的路径失效时间,在缓存器中根据时间、能量参数搜索最佳路径、丢弃最差路径的策略。利用ns2对4组场景进行仿真,结果显示对DSR路径缓存策略进行优化后,比较明显改进了DSR协议性能。 相似文献
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一种用于多跳分布式无线网络的多址接入协议及其性能分析 总被引:1,自引:0,他引:1
为多跳分布式无线网络提出了一套灵活而有效的自适应获取冲突避免(AACA)的多址接入协议.它综合了多信道和随机附带预约的思想,有效地解决了多跳网络环境下出现的隐藏终端和暴露终端问题以及由于节点的移动而造成的侵入终端问题.在该协议中,各节点自适应预约所要使用的空闲业务信道,预约之后的通信过程不会受到其它节点的干扰.AACA协议有三种形式,即AACA-SDT/MDT/RDT协议,它们使用任意确定数目的信道,在总带宽相同的情况下表现出比单信道RTS/CTS协议更好的网络性能. 相似文献
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将多协议标签交换(MPLS)技术与无线自组网组播机制相结合可以把MPLS在分组转发以及支持服务质量、流量工程等方面的技术优势引入到无线自组网组播路由协议设计中,具此提出了一种基于MPLS技术的组播协议设计方案——标签交换转发组播协议(Label-Switching Forwarding multicast routing protocol,以下简称LSF组播协议)。 相似文献
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多描述视频编码是无线Adhoc网络中提高视频质量的一种很有效的编码方式,对于多描述编码的传输,常采用多径路由策略,论文将贝叶斯优化算法应用到多描述编码的多径路由中,以降低传输的失真。实验结果表明,贝叶斯优化算法对于解决多描述视频编码的传输失真具有良好的性能。 相似文献
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无线Ad Hoc网络能量感知地理路由协议研究进展 总被引:1,自引:0,他引:1
无线Ad Hoc网络(以下简称为Ad Hoc网络)能量感知地理路由协议深度影响网络性能,具有降低网络能量消耗、延长网络寿命等功效,受到越来越多的关注.系统阐述了Ad Hoc网络能量感知地理路由协议的研究进展.首先介绍了Ad Hoc网络地理路由,进而详细概述了能量感知地理路由协议形成的背景、度量指标、节点选择规则、研究意义及分类;然后,详细介绍了典型能量感知地理路由协议,并从多角度对其进行了归纳总结与比较;最后,阐述了能量感知地理路由协议研究存在的问题,指出了未来需要研究的内容,并在此基础上进行总结. 相似文献