Collaborative Research: Protocols for Mobile Ad Hoc Networks

移动自组织网络是一种多跳无线网络，具有动态变化的网络拓扑结构。在这个项目中，研究人员将研究与移动自组织网络中的路由、介质访问控制和传输层相对应的几个协议设计问题。重点是与各个层以及层间交互相关的性能问题。路由被认为是移动自组织网络的核心挑战。许多路由协议使用按需全网泛洪来定位目的地。研究人员建议评估两种技术，一种基于位置信息，另一种基于局部启发式，将洪水定位到有限的区域。所提出的方法有望减少路由开销以及端到端分组传输延迟。该项目还将研究有助于高效路由的介质访问控制（MAC）设计。特别是，研究人员建议评估多通道CSMA方案，以最大限度地减少高负载下的多址干扰。这些方案有望减少广播洪水的有害影响。最后，本项目还将考虑MAC和路由协议对传输协议（特别是TCP）的影响。研究人员将研究TCP的流量和拥塞控制机制如何受到移动性和介质访问争用的影响，并开发技术来提高TCP在移动自组织网络上的性能。

Mobile ad hoc networks are multi-hop wireless networks, with dynamically changing network topology. In this project, the researchers will investigate several protocol design issues corresponding to routing, medium-access control, and transport layers in mobile ad hoc networks. The focus is on performance issues related to individual layers as well as inter-layer interactions. Routing is recognized to be the central challenge in mobile ad hoc networks. Many routing protocols use on-demand network-wide flooding to locate the destination. The researchers propose to evaluate two techniques to localize flooding to only a limited region | one based on location information, and the other based on locality heuristics. The proposed approaches are expected to reduce routing overhead as well as end-to-end packet delivery delays. This project will also investigate medium-access control (MAC) designs that aid efficient routing. In particular, the researchers propose to evaluate multi-channel CSMA schemes that minimize multiple access interference at high load. These schemes are expected to reduce the detrimental effects of a broadcast flood. Finally, this project will also consider the impact of MAC and routing protocols on transport protocol (particularly, TCP). The researchers will investigate how TCP's flow and congestion control mechanism is affected by mobility and medium access contention, and develop techniques to improve TCP performance on mobile ad hoc networks.