排序方式: 共有53条查询结果,搜索用时 15 毫秒
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基于服务器转发的支持多种通信方式的通信协议 总被引:2,自引:0,他引:2
提出了一种基于服务器转发的通信协议,其能够支持广播、组播、单播这几种通信方式,支持多种类型消息的通信。介绍了该协议的功能、报文格式以及实现方法。 相似文献
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This paper demonstrates the use of extreme value theory in the asymptotic throughput analysis of wireless multicast and unicast for large number of users. Exact analysis of these schemes involves finding the probability distributions of maxima or minima of signal to noise ratios (SNRs). Jointly considering random user distribution and Rayleigh fading, exact distributions of these extreme values become complex and lack insights. On the other hand, asymptotic expressions obtained by using extreme value theory are quite accurate even for moderate number of users and they give insights about the performances without using simulations. The results of this analysis can be used in designing cellular unicast and multicast systems. 相似文献
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季秀兰 《数字社区&智能家居》2007,1(2):350-351
IPv6以其能够较好地解决端到端IP连接、服务质量(QoS)、安全性、多播、移动性、即插即用等问题的技术优势必将成为下一代互联网的核心技术.文中首先对IPv6的地址体系结构进行了简单介绍,然后较详细的论述了IPv6的地址类型及其表示方法,并对RFC2374提出的IPv6全局可聚类单播地址的分配方案与试验床关于IPv6全局可聚类单播地址的分配方案进行了比较,最后给出了几点关于地址分配的建议. 相似文献
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网络层析技术通过端到端测量就能推测网络的内部性能,无须网络中间节点配合,因此被广泛的应用于网络测量及诊断。对基于单播的网络丢包率层析成像模型进行了详细的探讨,并针对现有的单播层析发包方式的包组相关性缺陷提出了一种改进发包方法。通过NS2的仿真,证明了改进的发包机制能更加准确的估算网络丢包率。 相似文献
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提高蜂窝网络中数据分发效率的D2D协作转发算法 总被引:3,自引:0,他引:3
Device-to-Device(D2D)通信是一种移动终端在蜂窝通信系统的控制下使用授权频段进行点到点通信的新型技术。通过允许接收终端间的数据转发,D2D通信可以用来提高蜂窝网络中的数据分发效率。现有的终端间转发算法,没有充分考虑D2D链路的差异,很难实现频谱资源的高效利用。为此,该文提出了一种基于多跳中继的D2D协作转发算法,包括多播和单播两个模式。该算法根据D2D链路质量自适应地选择最优的中继、路由及传输跳数,能够充分利用D2D链路的多信道分集增益。仿真结果表明,该文所提出的算法能够显著地提高D2D转发的资源利用率,进而提升数据分发业务的吞吐量。 相似文献
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We analyze the problem of finding an energy-efficient path from a source node to a destination using geographic routing. Existing
schemes have neglected the fact that neighbors which are not closer to the destination than the current node can still reduce
energy consumption by taking part in the selected path. Moreover, recent works have confirmed that the generally used Unit
Disk Graph to model Wireless Sensor Networks does not represent accurately the behavior of real links. We propose a new scheme
called Locally Optimal Source Routing (LOSR) that is able to use neighbors which do not provide advance toward the destination
to reduce the overall energy consumption while still avoiding routing loops. Using an Automatic Repeat reQuest (ARQ) mechanism
hop by hop we overcome the problems caused by errors in radio transmissions and we introduce a novel routing metric, which
accounts for those errors in the energy consumption. Our simulation results show that the proposed scheme outperforms existing
solutions over a variety of scenarios and network densities.
相似文献
Pedro M. RuizEmail: |