Control & Performance Trade-offs in Multihop Wireless Networks

由于移动通信的压力越来越大，全无线通信网络，甚至可能是全移动通信网络，将来可能会用于商业和军事应用。这种网络在根本上不同于传统的网络，因为它们可能不共享固定的“有线”通信基础设施。 它们被称为"多跳无线网络”，可能作为提供个人通信服务的替代手段出现，也可能作为“独立”或与一般基础设施弱耦合的专门网络出现。研究人员建议研究这些网络特有的基本操作和设计原则，并开发双层网络的原型设计。具体而言，研究人员计划解决以下问题，并研究主要与网络架构中的第2-4层相关的相关性能权衡：a）什么路由算法非常适合可变连接环境？B）什么样的地址和移动性管理方法是合适的？它们是如何与路由耦合的 背景？c）有哪些多播方法是可能的？d）作为网络控制参数的电源管理在节省电池能量方面应该扮演什么角色？e）在非对称网络中，"推”和"拉”通信之间的基本权衡是什么 建筑？f）在信道损害下，对于可靠性和效率，路径分集的最佳利用是什么 条件？（g）什么样的资源分配方法是适当的？通过利用其他支持，研究人员打算在现有的网络测试平台上实施一些控制策略，并利用这些经验来帮助开发多跳无线网络的设计模型。 该测试平台位于马里兰州大学系统研究所的混合网络实验室，利用了实验室现有的设备和人力资源设施。

All-wireless and, possibly, all-mobile communication networks are likely to operate in the future for both commercial and military applications, as a result of increasing pressure for communication while``on the move.'' Such networks differ from traditional ones in fundamental ways since they may not share the fixed, ``wired'' communication infrastructure. They are refereed to as ``multihop wireless networks".They may arise as alternative means of providing personal communication services, or as specialized networks that are ``stand-alone'' or are weakly coupled to the general infrastructure. The researchers propose to study the fundamental principles of operation and design that are unique to these networks,and to develop a prototype design for a bi-level (two tier) multihop architecture that will be based on these principles.Specifically, the researchers plan to address the following questions and to study the associated performance trade-offs that pertain mostly to layers 2-4 in the networking architecture:a) what routing algorithms are well-suited to variable connectivity environments?b) what address and mobility management methods are appropriate? how are they coupled to routing in this context?c) what multicasting methods are possible?d) what should be the role of power management as a network control parameter to conserve battery energy?e) what are the fundamental trade offs between ``push" and ``pull" communications in asymmetric network architectures?f) what is the best utilization of path diversity for reliability and efficiency under channel impairment conditions?g) what resource allocation approaches are appropriate?By leveraging other support, the researchers intend to implement some control policies developed as a result of this investigation in an existing network testbed, and use this experience as an aid in developing a design model for multihop wireless networks. This testbed exists in the Hybrid Networks Laboratory of the Institute for Systems Research at the University of Maryland and leverages the existing equipment and humanresource facilities available at the lab.