CAREER: Quality of Service in Mobile Computing Environments

未来的移动计算环境将需要支持诸如Web浏览、多媒体会议等通信密集型应用。这需要在稀缺和共享的无线链路上提供持续的服务质量。在有线领域，类似的资源共享问题导致了综合业务分组网络(ISPN)的发展，该网络支持针对不同应用的多个服务类别。类似的解决方案在蜂窝分组网络领域是合适的，特别是因为应用需求将更加多样化，系统资源将更加严格。在我们的环境中有三个关键问题：(A)应用程序应该尽可能不受底层网络动态的影响，(B)用户在小区之间的移动性应该是无缝的，以及(C)由于资源稀缺，网络利用率应该最大化。在这个项目中，我们建议提供一个在移动计算环境中支持服务质量的综合业务蜂窝分组网络(ISCN)。我们的方案有三个关键思想：(A)我们提出了自适应服务，它在范围内提供了服务质量保证，并支持一组针对无线信道错误和移动性的增强的服务质量参数；(B)我们提出了新的资源适配算法，以便在存在移动性的情况下提高网络利用率；以及(C)我们提出了新的预测提前预留算法，以便为ISCN中的多个小区的用户提供无缝移动性。欲了解更多项目详情和出版物，请访问以下网址：http://timely.crhc.uiuc.edu/projidx.html

Future mobile computing environments will need to support communication intensive applications such as Web browsing, multimedia conferencing, etc. This requires providing sustained quality of service over scarce and shared wireless links. In the wireline domain, similar resource sharing problems have led to the development of Integrated Services Packet Networks (ISPN) that support multiple service classes for different applications. A similar solution is appropriate in the cellular packet network domain, particularly because application demands will be even more varied, and system resources even more stringent. Three concerns are critical in our environment: (a) applications should be shielded from underlying network dynamics as much as possible, (b) user mobility between cells should be seamless, and (c) due to scarcity of resources, network utilization should be maximized. In this project, we propose to provide an Integrated Services Cellular Packet Network (ISCN), which supports quality of service in mobile computing environments. There are three key ideas in our proposal: (a) we propose Adaptive Services, which provide QoS guarantees/assurances within bounds and support an enhanced set of QoS parameters for wireless channel error and mobility; (b) we propose new algorithms for resource adaptation in order in increase the network utilization in the presence of mobility; and (c) we propose new algorithms for predictive advance reservation in order to provide seamless mobility for users across multiple cells in the ISCN. For more project details and publications, please refer to the following URL: http://timely.crhc.uiuc.edu/projidx.html