Optimization of Delay Constrained Wireless Communication Networks

延迟受限无线通信网络的优化

• 批准号: 9725568
• 负责人: Laurence Milstein
• 金额: $ 88.03万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-15 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725568&HistoricalAwards=false
• 关键词: Optimization; Delay; Constrained; Wireless; Communication

Traditionally, in order to address the many complex issues that arise in communication networks, a ``layered" approach has been taken. The different layers are typically assigned different ``responsibilities," so that the general network design problem can be decomposed into simpler, more manageable problems. However, the independent design of the different layers - which ignores the detailed nature of their mutual interactions, shared constraints, and cumulative impact on the network's overall performance - can lead to inefficiencies. Future wireless communication networks will be required to provide wide coverage and high capacity to mobile users generating bursty multi-media information. This heterogeneous traffic will impose upon the network time-varying quality of service (QoS) constraints. Since many multi-media applications have delay-sensitive information with varying reliability requirements, such as numerical data, voice, and video, the project will take end-to-end delay and data integrity as its dominant system constraints. The goal of this project is, in the broadest sense, to take a more global view of end-to-end performance, to better understand the interactions among the layers, to develop techniques that improve system performance through joint optimization over the various layers and to do so in the context of a end-to-end delay constraint. One key theme of the proposal involves the optimization of system performance in the context of multiple users, particularly in a system which does not employ a cellular-type architecture. This requires the development of techniques that, on the one hand, address the deleterious effects of multiple-user interference at the physical layer, yet also incorporate end-to-end QoS objectives, especially delay, just as with the development of routing and scheduling algorithms. Another major theme will be the determination of the optimal distribution and the real-time dynamics of error control functions implemented across t he layers of the network, subject to specified end-user requirements. This requires investigation of inherent tradeoffs between error-rate and decoding delay of FEC employed at the physical layer, as well as the interactions among error control functions, including retransmission strategies, invoked at higher levels.

传统上，为了解决通信网络中出现的许多复杂问题，采用了“分层”方法。不同的层通常被分配不同的“职责”，这样一般的网络设计问题就可以分解成更简单、更易于管理的问题。然而，不同层的独立设计——忽略了它们相互作用的详细性质、共享约束和对网络整体性能的累积影响——可能导致效率低下。未来的无线通信网络将要求为产生突发多媒体信息的移动用户提供广泛的覆盖和高容量。这种异构流量将对网络时变服务质量（QoS）施加约束。由于许多多媒体应用都有延迟敏感信息，并且具有不同的可靠性要求，例如数字数据、语音和视频，因此该项目将端到端延迟和数据完整性作为其主要的系统约束。从最广泛的意义上说，这个项目的目标是对端到端性能采取更全面的看法，更好地理解层之间的相互作用，开发通过在各个层上的联合优化来提高系统性能的技术，并在端到端延迟约束的背景下这样做。该提案的一个关键主题涉及在多用户环境下的系统性能优化，特别是在不采用蜂窝类型架构的系统中。这需要技术的发展，一方面，解决物理层多用户干扰的有害影响，但也包括端到端QoS目标，特别是延迟，就像路由和调度算法的发展一样。另一个主要主题将是确定跨网络层实现的误差控制功能的最佳分布和实时动态，以满足指定的最终用户需求。这需要研究物理层使用的FEC的错误率和解码延迟之间的内在权衡，以及在更高级别调用的错误控制功能（包括重传策略）之间的相互作用。