CAREER: Resource Sharing and Performance Analysis Algorithms for Integrated-Services Networks

承载语音、视频和数据等具有不同服务质量(Qos)要求的多种业务类别的综合业务通信网络正在成为现实。每个流量类别的特征是它从网络请求的带宽量，以及它在网络中的到达过程和保持时间的统计数据。新兴高速网络的一个关键特征是，不同业务类别的这些特征往往大相径庭。我们重点研究了这类网络中的两个重要问题：(I)不同带宽需求的业务的资源共享和(Ii)用于评估这类网络的路由和接纳控制的性能分析算法。高带宽呼叫通常在没有某种形式的准入控制的情况下遇到高阻塞概率，这种准入控制保留了网络资源的特定部分来处理这些呼叫。本研究项目的一个目标是开发接纳控制和路由方案，以在不影响网络利用率的情况下提高高带宽呼叫的阻塞性能。在评估此类接纳控制和路由方案的性能时，大量带宽类别的存在也带来了独特的挑战。我们将开发分析和模拟技术的组合，以快速准确地估计网络中所有流量类别的阻塞概率。

Integrated-services communication networks that carry multiple traffic classes with different Quality-of-Service (QoS) requirements such as voice, video and data are becoming a reality. Each traffic class is characterized by the amount of bandwidth that it requests from the network, and the statistics of its arrival process and holding time in the network. A key feature of emerging high-speed networks is that these characteristics for the various traffic classes tend to be widely different. We focus on two important issues in such networks: (i) resource sharing for traffic with different bandwidth requirements and (ii) performance analysis algorithms to evaluate routing and admission control for such networks. High bandwidth calls typically experience high blocking probabilities without some form of admission control that reserves a certain portion of the network's resources to handle these calls. A goal of this research project would be to develop admission control and routing schemes to improve the blocking performance of high bandwidth calls without adversely affecting the network utilization. The presence of a large mixture of bandwidth classes also poses unique challenges in evaluating the performance of such admission control and routing schemes. We will develop a combination of analytical and simulation techniques that would provide fast and accurate estimates of the blocking probabilities for all traffic classes in the network.