CAREER: Achievable QoS and Scheduling Policies for Integrated Services Wireless Networks

在综合业务无线网络中，地理上分布的异构应用程序必须共享一个公共无线信道。为了协调传输资源的共享，需要TDMA （time-division multiple access）或CDMA （code-division multiple access）等多址协议。在综合业务网络中，为了控制QoS，通常既需要允许呼叫，也需要对被允许的呼叫进行资源管理（分组级调度）。在允许呼叫时，必须首先确定是否存在可以向网络中的每个应用程序提供目标QoS的插槽分配（如TDMA）或电源管理（如CDMA）策略。要回答这个问题，需要确定可实现QoS的范围（可以在任何可接受的策略下交付的性能向量集）。可实现QoS的范围取决于底层信道条件和多址技术。每种接入技术在对抗无线信道的影响和在提供不同QoS要求的同时适应可变速率服务方面都有其固有的优点和缺点。确定可实现QoS的区域，导致了呼叫接纳和调度功能的发展。在过去的五年中，PI一直在无线网络上进行综合业务领域的研究，现在提议通过开发综合业务无线网络（ISWN）试验台，将他和其他人先前的一些研究转化为可行的技术和教育工具。ISWN项目是多方面的，因为它包含教育、发展和研究部分。该计划将分三个阶段实施：系统设计及规格、发展支援多媒体通讯的新方法，以及在运作系统内实施软件。

In integrated services wireless networks, geographically distributed heterogeneous applications must share a common wireless channel. To coordinate the sharing of the transmission resources, a multiple access protocol such as time-division multiple access (TDMA) or code-division multiple access (CDMA) is required. To control QoS in an integrated services network, usually both call admission and resource management (scheduling at the packet level) among the admitted calls are needed.At call admission, it must first be determined if there exists a slot allocation (as in the case of TDMA) or power management (as in case of CDMA) policy that can deliver a target QoS to each application in thenetwork. To answer this question, the region of achievable QoS (set of performance vectors that can be delivered under any admissible policy) needs to be identified. The region of achievable QoS will depend on the underlying channel conditions and the multiple access technology. Each access technology has its inherent advantages and disadvantages in combating the effects of the wireless channel and in its ease of accommodating variable rate service while delivering diverse QoS requirements. The determination of the region of achievable QoS leads to the development of call admission and scheduling functions.The PI has been conducting research in the area of integrated services over wireless networks for the past five years and now proposes to translate some of his and others prior research into viable technologyand educational tools through the development of an integrated services wireless network (ISWN) test-bed. The ISWN project is multifaceted in the sense that it contains educational, development, and research components. The project will be implemented in three phases: system design and specification, development of novel approaches to support multi-media traffic and software implementation in an operational system.