CAREER: Quality of Service in Mobile Computing Environments

未来的移动计算环境将需要支持通信密集型应用，如Web浏览、多媒体会议等。这需要在稀缺的共享无线链路上提供持续的高质量服务。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种服务类别。类似的解决方案适用于蜂窝分组网络领域，特别是因为应用程序需求将更加多样化，系统资源将更加严格。在我们的环境中，有三个问题是至关重要的：(a)应用程序应该尽可能地不受底层网络动态的影响，(b)单元之间的用户移动性应该是无缝的，(c)由于资源稀缺，网络利用率应该最大化。在这个项目中，我们建议提供一个集成业务蜂窝分组网络（ISCN），它支持移动计算环境中的服务质量。在我们的提案中有三个关键思想：(a)我们提出自适应服务，它在一定范围内提供QoS保证/保证，并支持一组增强的QoS参数，以应对无线信道错误和移动性；(b)我们提出了新的资源适应算法，以便在移动性存在的情况下提高网络利用率；(c)我们提出了预测性提前预订的新算法，以便为ISCN中多个单元的用户提供无缝移动性。有关更多项目细节和出版物，请参阅以下网址：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