Integrated Design of Wireless Information Networks

未来无线信息网络（WINs）将提供综合业务（例如，语音、视频、数据、图像和多媒体），每个业务都有自己的带宽和服务质量（QoS）要求。为了应对这一挑战，有必要设计能够有效处理带宽管理、移动性、多径衰落、阴影、干扰、链路（信道）质量和网络拓扑的突然变化、QoS要求的可变性以及不断增长的用户需求的系统。有效处理上述问题的设计必须共同优化子系统的操作，这些子系统可能跨越多个网络体系结构和协议层。提出的研究旨在集成WINs设计，考虑层之间的相互作用，并利用这些相互作用来发现有效处理上述问题的算法。我们认为物理层在WINs的性能中起着至关重要的作用，因为它是网络架构中最不可控和最不可预测的一层。这就是为什么我们建议：(i)主要理解物理层对数据链路控制、媒体访问控制（MAC）、网络和传输层性能的影响；（ii）利用这种影响，开发一种系统的方法来综合设计WINs。为了实现这一目标，我们建议分别研究单跳和多跳问题，并理解到，最终，整体设计将以迭代的方式整合单跳问题的关键问题和多跳问题的关键问题。对于单跳问题，我们将(i)研究物理层组件之间的相互作用，以便我们可以改进物理层的设计；（ii）利用物理层对数据链路控制、MAC和传输层的影响，以开发有效的自动重复请求（ARQ）算法和动态资源分配算法，并开发提高无线链路上传输控制协议（TCP）性能的机制。对于多跳问题，我们将(i)利用物理层、数据链路控制层和MAC层对网络层的影响，开发高效的多跳路由、备用路由、功率控制（拓扑控制）、负载平衡和拥塞控制算法；（ii）利用物理、数据链路控制和MAC层对传输层的影响，在多跳WINs中设计简单、高效和健壮的TCP机制；（iii）设计和验证包含(i)和（ii）中开发的算法和机制的简单通信协议。拟议的活动与密歇根大学和普渡大学的其他相关研究活动相结合，将为培训未来的无线信息网络工程师提供极好的工具。关键词：无线网络，资源分配，接收机结构，衰落信道，综合业务，路由和流量控制。

Future Wireless Information Networks (WINs) will provide integrated services (e.g., voice, video, data, images, and multimedia) each with its own bandwidth and Quality of Service (QoS) requirements. To meet this challenge, it is necessary to design systems that deal effectively with bandwidth management, mobility, multipath fading, shadowing, interference, abrupt changes in link (channel) quality and network topology, variability in QoS re-quirements, and increasing user demand. Designs that deal effectively with the above issues will have to jointly optimize the operation of subsystems that potentially cut across several network architecture and protocol layers.The proposed research aims at integrated designs of WINs that account for the interactions among layers andtakes advantage of these interactions to discover algorithms that deal effectively with the abovementioned issues.We believe that the physical layer plays a crucial role in the performance of WINs because it is the leastcontrollable and predictable layer in the network architecture. This is why we propose to: (i) understand primarily the impact of the physical layer on the performance of the data link control, Media Access Control (MAC), network, and transport layers; and (ii) exploit this impact to develop a systematic approach to the integrated design of WINs. To achieve this goal, we propose to investigate single-hop and multi-hop problems separately, with the understanding that, eventually, an overall design will integrate, in an iterative manner, the issues critical for single-hop problems with those that are critical for multi-hop problems.For single-hop problems, we will (i) investigate the interactions among components of the physical layer sothat we can improve the layer's design; (ii) exploit the impact of the physical layer on the data link control,MAC, and transport layers in order to develop efficient Automatic Repeat reQuest (ARQ) algorithms, and dynamic resource allocation algorithms, and to develop mechanisms to improve the performance of Transmission Control Protocol (TCP) over wireless links. For multi-hop problems, we will (i) exploit the impact of the physical, data link control, and MAC layers on the network layer to develop efficient multi-hop routing, alternate routing, power control (topology control), load-balancing, and congestion control algorithms; (ii) take advantage of the impact of the physical, data link control, and MAC layer on the transport layer to design simple, efficient, and robust mechanisms of TCP in multi-hop WINs; (iii) design and validate simple communication protocols incorporating the algorithms and mechanisms developed in (i) and (ii).The proposed activities in connection with other relevant research activities at the University of Michigan and Purdue University will provide an excellent vehicle for the training of future wireless information network engineers.Keywords: Wireless networks, resource allocation, receiver architecture, fading channels, integrated services,routing and flow control.