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1.
A unicast-based fault-tolerant multicasting method is proposed for hypercubes, which can still work well when the system contains enough faults. A multicast message may be unable to reach a destination if Hamming distance between the destination and the multicast source is large enough. A multicast message fails if any one of the destinations is unreachable from the source. An effective destination ordering scheme of the destinations is proposed for one-port systems first, it is extended to all-port systems for unicast-based fault-tolerant multicasting. Unreachable destinations from the source based on the local safety information are forwarded to a reachable destination, where the multicast message can be routed reliably. Destination ordering is completed based on Hamming distance. A multiple round p-cube routing scheme is presented for a deadlock-free fault-tolerant routing for each unicast step in hypercubes, where the same virtual channel is used for each round of p-cube routing. Sufficient simulation results are presented by comparing with the previous methods. 相似文献
2.
Many potential applications of Mobile Ad Hoc Networks (MANETs) involve group communications among the nodes. Multicasting is an useful operation that facilitates group communications. Efficient and scalable multicast routing in MANETs is a difficult issue. In addition to the conventional multicast routing algorithms, recent protocols have adopted the following new approaches: overlays, backbone-based, and stateless. In this paper, we study these approaches from the protocol state management point of view, and compare their scalability behaviors.To enhance performance and enable scalability, we have proposed a framework for hierarchical multicasting in MANET environments. Two classes of hierarchical multicasting approaches, termed as domain-based and overlay-driven, are proposed. We have considered a variety of approaches that are suitable for different scenarios such as multicast group sizes and number of groups. Results obtained through simulations demonstrate enhanced performance and scalability of the proposed techniques. 相似文献
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基于非线性效应的全光组播,以其能直接在光域内将信息从单节点路由到多目标节点而受到广泛关注。实验证实了利用色散平坦高非线性光子晶体光纤级联光学滤波器实现全光波长组播的新方案,通过使用窄带光学滤波器次选择自相位调制加宽光谱分量,对速率为40 Gbit/s 的归零信号实现了极性保持、通道间距100 nm 的1 到6 信道全光波长组播。进一步研究了所设计全光波长组播器的动态特性,结果表明,它具有20 nm 的宽带波长调谐范围,同时,对输入信号的光功率波动具有较强的容忍性,系统整体结构简单,在未来透明光子网络中很有应用潜力。 相似文献
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如何克服服务器负载过重造成的瓶颈效应,及如何适应网络的动态变化,是视频会议系统一直面临的问题.提出了一种基于分布式代理的自适应视频会议系统.该系统充分利用当前的网络条件,采用分布式代理,使用应用层组播和IP层组播相结合的混合组播方式,解决了服务器瓶颈问题;采用基于MPEG-4FGS速率修整技术,使系统具有极好的网络自适应性. 相似文献
7.
In this paper, secure multicasting with the help of cooperative decode‐and‐forward relays is considered for the case in which a source securely sends a common message to multiple destinations in the presence of a single eavesdropper. We show that the secrecy rate maximization problem in the secure multicasting scenario under an overall power constraint can be solved using semidefinite programing with semidefinite relaxation and a bisection technique. Further, a suboptimal approach using zero‐forcing beamforming and linear programming based power allocation is also proposed. Numerical results illustrate the secrecy rates achieved by the proposed schemes under secure multicasting scenarios. 相似文献
8.
介绍IP多路广播技术在广域网中的应用,通过描述TCP/IP协议中IP多路广播的特点和基于卫星数据网的多路广播网络结构,结合多路广播应用软件在休斯综合卫星业务图ISBN上的实现,提供了一种充分利用卫星通信独有的覆盖面广的广播优势和经济有效的传播多媒体信息的技术手段。 相似文献
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随着流媒体、视频等业务在Internet上的相继开展,IP组播技术和应用开始快速发展。本文主要分析IP组播技术的产生、概念和特点,以及相关技术,结合油田开发实际, 介绍了IP组播技术在油田开发监控中的应用。 相似文献
10.
Sheng-Chang Chen Chyi-Ren Dow Ren-Di Wang Yi-Hsung Li Shiow-Fen Hwang 《Wireless Personal Communications》2009,48(3):441-462
Multicasting is an essential service for mobile ad-hoc networks. A major challenge for multicasting in mobile ad-hoc networks
(MANETs) is the unstable forwarding path. This work presents a reliable multicasting protocol for mobile ad-hoc networks.
A virtual backbone is used as a shared structure for multiple sessions. A lost packet recovery scheme is developed for reliable
packet transmission, called the Recovery Point (RP) scheme. The RP scheme maintains the data packets received from the source
for recovering lost packets for its downstream RPs. In addition, we combine the Forward Error Correction (FEC) technology
with our RP scheme to enhance the reliability of our RP scheme. A mergence scheme for RP is also proposed to avoid excessive
control overhead. Our RP and FEC based scheme can be used to improve the reliability and efficiency of the traditional non-acknowledged
multicasting approach. Experiments were conducted to evaluate the proposed multicasting scheme. The results demonstrate that
our scheme outperforms other schemes in terms of packet delivery ratio and multicast efficiency. Furthermore, the simulation
results also demonstrate that our approach is stable in networks with high mobility.
相似文献
Shiow-Fen HwangEmail: |