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无线Mesh网络与IEEE802系列标准 总被引:1,自引:0,他引:1
无线宽带接入系统发展迅速,但带宽容量低、覆盖范围小等缺点限制了它的进一步发展。作为“最后一公里”宽带无线接入非常重要的技术之一。无线Mesh网络(WMN)可以和多种无线网络系统,如无线局域网(WLAN)、无线个域网(WPAN)以及无线城域网(WMAN)等相结合,改善无线网络的性能,提高网络的覆盖范围。随着无线Mesh网络技术的厂泛应用,IEEE802的相关标准组正在致力于推动WMN技术的发展,制订相关的技术标准。目前,WMN标准已经出现在IEEE802.11s、80215、802.16、802.20中。 相似文献
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无线网格网络(Wireless Mesh Network,WMN)是一种新型的无线宽带接入网络,它融合了无线局域网WLAN和Ad Hoc网络的优势,是一种大容量、高速率、覆盖范围广的网络,已成为宽带接入的一种有效手段。 相似文献
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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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无线Mesh网络(Wireless Mesh Network,WMN)是一种新兴的源于移动Ad Hoc网络的宽带无线接入技术.它通过网关节点接入因特网.实际应用中当网络接入业务量很大或网络规模扩大时,一个网关节点将成为网络接入性能的"瓶颈",大量转发的数据包将导致严重的拥塞.针对此问题提出一种基于移动自组网DSR协议的多网关选播路由协议MAMSR,仿真实验表明它能有效解决接入拥塞问题. 相似文献
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一、引文
过去无线局域网技术(WLAN)通常被用于室内的热点覆盖,随着人们对无线接入范围的不断扩大以及室内区域无线接入系统的完成,室外区域成了无线接入新的热点。由于室内外环境差异及覆盖要求的改变,室内无线接入的经验难以适用于室外小区,本文将介绍几种适用室外无线热点WLAN覆盖的无线接入方案,并说明各方案的特点及使用场景。 相似文献
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随着使用WLAN(无线局域网)接入因特网的日渐普及,IEEE802.11eWLAN中的HCCA(混合控制信道接入)机制由于在处理实时多媒体业务的高效率受到越来越广泛的关注。在WLAN中为达到高带宽利用率和良好的端到端QoS,介绍了一种基于HCCA机制的带宽分配算法,同时对该算法与802.11PCF(点协调功能)两种接入场景下的网络性能进行仿真比较,其结果验证了该算法可以为WLAN提供良好的QoS保证,对在WLAN中传输语音、视频等实时业务具有一定的指导意义。 相似文献
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IP化基站无线Mesh组网构架 总被引:1,自引:0,他引:1
无线网状网(WMN)融合了无线局域网(WLAN)和Ad Hoc网络的性能优势,具有容量大、速率高、覆盖范围广等特点,成为宽带无线接入的一种有效手段,可以灵活地应用于多种无线环境。目前,蜂窝移动通信系统中各基站间的有线连接,使得传统的蜂窝移动通信系统难以满足部署方便、成本低廉、高可扩展性、高可靠性等指标。为适应下一代移动通信网络扁平化、简单化的发展趋势,IP化基站的无线Mesh组网架构是可选方案之一。支持IP化基站自组织的关键技术包括按需的基站自组织技术、联合无线资源调度机制、路由技术、安全技术、网络管理技术等。 相似文献
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With the increasing popularity and rising demand for high-rate wireless Internet access, traditional wireless access networks such as cellular network and Wireless Local Area Network (WLAN) are facing some challenges. The Wireless Mesh Network (WMN) is emerging as a flexible and low-cost alternative to provide multi-hop communications, supporting applications such as last-mile Internet delivery. The WMN has also become a promising technology in the merging of wireless networks. Some key technologies for the WMN networking, including network configuration, power control, mobility management, access control, and routing protocols, are analyzed; the routing protocol design in WMN and mobile Ad hoc network are compared. An example of WMN testbed based on WLAN and second-layer switching technology is given. 相似文献
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Wireless Mesh Network (WMN) is seen as an effective Internet access solution for dynamic wireless applications . For the low mobility of mesh routers in WMN, the backbone topography can be effectively maintained by proactive routing protocol. Preproposals like Tree Based Routing (TBR) protocol and Root Driven Routing (RDR) protocol are so centralized that they make the gateway become a bottleneck which severely restricts the network performance. We proposed an Optimized Tree-based Routing (OTR) protocol that logically separated the proactive tree into pieces. Route is partly computed by the branches instead of root. We also discussed the operation of multiple Internet gateways which is a main issue in WMN. The new proposal lightens the load in root, reduces the overhead and improves the throughput. Numerical analysis and simulation results confirm that the performance of WMN is improved and OTR is more suitable for large scale WMN. 相似文献
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Although the wireless broadband access system is developing rapidly, its development is limited due to some disadvantages , such as small capacity of bandwidth and small coverage . The Wireless Mesh Network (WMN) is one of the important technologies for "last mile "broadband wireless access . The WMN can integrate with multiple wireless systems , such as Wireless Local Area Network (WLAN), Wireless Personal Area Network (WPAN), and Wireless Metropolitan Area Network (WMAN), to improve the performance of the wireless network and enlarge the coverage range . With the wide applications of the WMN, the IEEE 802 standard group is devoted to promoting the development of the WMN technology and establishing the related technical standards . At present, WMN standards have appeared in IEEE 802.11s , 802.15, 802.16, and 802.20. 相似文献
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无线网状网是一种新兴的宽带无线网络接入技术,支持不同应用场景的无线接入。IEEE802.11s标准定义了一种默认的路由选择算法,称为混合无线网状网协议(HWMP)。HWMP将把树状路由为基础的先应路由模式和按需路由模式相结合。对先应路由模式进行改进,以减小网络开销,增强网络性能。从仿真结果可以看出,改进后的算法在数据包到达率、平均端到端时延和吞吐量指标上达到了更佳的性能。 相似文献