NeTS-ProWiN: Implementation Techniques for Last-Mile Wireless Mesh Networks

IEEE 802.11无线局域网（WLAN）技术的爆炸式增长促使人们重新思考如何设计和实现城域网移动无线网络服务。具体来说，3G蜂窝网络的成本效益正受到质疑，因为其初始许可成本巨大。相比之下，利用基于802.11的WLAN硬件或新兴的802.16无线宽带接入标准（WiMAX）的无线网状网络（WMN）不会产生任何许可费用，因为它们在未经许可的频谱中运行。此外，无线网状网络的硬件/软件组件相对便宜，因为它们在消费者和企业市场的成功创造了规模经济，并显著降低了制造和开发成本。该项目正在开发、实施和评估一种名为Hyacinth的新型无线网状网络架构，该架构专门用于支持最后一英里宽带互联网接入。风信子具有其他wmn中不存在的一些独特创新。首先，Hyacinth通过支持每个WMN节点的多个WLAN接口（每个接口在不同的无线信道上运行）显著提高了WMN的总吞吐量。其次，Hyacinth支持主机透明的网络层切换方案，该方案在终端主机跨不同子网移动时保持网络应用程序的连续性，而不需要对终端主机进行任何修改。第三，Hyacinth通过为每个WMN节点配置一组接入点并动态平衡其负载来提高每个WMN节点的总吞吐量。第四，Hyacinth的路由协议在路由更新中建立了足够的冗余，这样就可以检测和隔离存在的受损节点。

NeTS-NR: Implementation Techniques for Last-Mile Wireless Mesh NetworksTzi-Cker Chiueh, SUNY at Stony BrookAward 0435373AbstractThe explosive growth of IEEE 802.11 wireless LAN (WLAN) technology has prompted a rethinking of how metropolitan-area mobile wireless network services should be designed and implemented. Specifically the cost-effectiveness of 3G cellular networks is being called into question owing to their gargantuan initial licensing cost. In contrast, wireless mesh networks (WMN) that leverage 802.11-based WLAN hardware or the emerging 802.16 wireless broadband access standard (WiMAX) do not incur any licensing fees because they operate in the unlicensed spectrum. Moreover, the hardware/software components of wireless mesh networks are relatively inexpensive since their success in consumer and enterprise market segments creates economies of scale and significantly brings down the manufacturing and development cost. This project is developing, implementing, and evaluating a novel wireless mesh network architecture called Hyacinth that is specifically designed to support last-mile broadband Internet access. Hyacinth features several unique innovations that are not present in other WMNs. First, Hyacinth significantly increases the aggregate throughput of a WMN by supporting multiple WLAN interfaces per WMN node, each operating at a distinct radio channel. Second, Hyacinth supports a host-transparent network-layer handoff scheme that preserves continuity of network applications as end hosts move across different subnets, without requiring any modifications to end hosts. Third, Hyacinth improves the aggregate throughput of each WMN node by equipping each WMN node with an array of access points and dynamically balancing their load. Fourth, Hyacinth's routing protocol has built sufficient redundancy into route updates such that compromised nodes that lie can be detected and isolated.