NeTS - Collaborative Research - NR: Over-Probe: A Toolkit for the Management of Overlay Networks with Mobile Users

【摘要】该项目的主要目标是为支持移动用户的覆盖层开发有效的路径探测和拓扑管理方案。覆盖层有助于部署商业互联网无法提供的功能（例如，多播、qos感知路由等）。虽然传统的覆盖到目前为止已经连接了固定用户，但未来的覆盖必须也支持移动客户。需要有线和无线混合覆盖，包括无线段，甚至是“机会主义的”特设网络（例如，城市环境中的汽车网络）。为了满足这些需求，该项目开发了OverProbe，这是一个新的工具包，其中包括创新的探测技术CapProbe，可用于有线和无线覆盖链路。OverProbe非常快速地评估“虚拟链路”的质量。速度在无线中是至关重要的，因为用户在路径的末端可以在几分钟内跨越不同类型的无线媒体（例如，3G, 802.11，蓝牙，CDMA等）。除了频繁监控无线连接外，该工具包还帮助移动用户在不中断TCP连接的情况下进行软切换。研究还包括设计和评估可扩展的分层覆盖结构（使用“骨干覆盖”）。这项研究的结果将有助于在移动社区中推广新的服务，从远程办公到电子商务和娱乐。主要成果包括：(1)一套路径探测方法和工具（Over-Probe工具包）。(2)两层覆盖和代理架构。(3)在PlanetLab和WHYNET中的OverProbe实现。

NeTS - Collaborative Research - NR: Over-Probe: A Toolkit for the Management of Overlay Networks with Mobile UsersMario Gerla, UCLAAward 0435515AbstractThe main goal of this project is to develop efficient path probing and topology management schemes for overlays that support mobile users. Overlays facilitate the deployment of functions not available from the commercial Internet (e.g., multicasting, QoS-aware routing etc.). While conventional overlays so far have connected stationary users, the overlays of the future must support also mobile customers. There is need for hybrid wired and wireless overlays that include wireless segments and even "opportunistic" ad hoc networks (e.g., networks of cars in an urban environment).To respond to such needs, this project develops OverProbe, a new toolkit that includes the innovative probing technique CapProbe and works for both wired and wireless overlay links. OverProbe evaluates "virtual link" quality very rapidly. Speed is critical in wireless since the user at the end of the path may move across different type of wireless media (e.g., 3G, 802.11, Bluetooth, CDMA, etc.) within minutes. Besides frequent monitoring of wireless connectivity, the toolkit assists mobile users in soft handoff without breaking TCP connections. The research also includes the design and evaluation of scalable, hierarchical overlay structures (using "backbone overlays").The results of this research will help promote new services among the mobile community, from telecommuting, to e-commerce and entertainment. Key results include: (1) A set of path probing methodologies and tools (Over-Probe toolkit). (2) A two level overlay and proxy architecture. (3) OverProbe implementation in PlanetLab and WHYNET.