CAREER: Efficient Resource Allocation and Control in Mobile Wireless Networks with Multimedia Services

Internet的爆炸性增长和所有无线服务的持续急剧增长正在推动对增加容量、数据速率、支持的多媒体服务以及对不同类别服务的不同服务质量（QoS）要求的支持的需求。宽带CDMA （WCDMA）已被提议作为第三代（3G）无线系统的关键空中接口技术，并将继续作为向多媒体流量提供差异化服务的4G系统的有力候选而被采用。WCDMA系统具有动态改变用户信道速率的能力，可以提供更大的带宽分配灵活性。虽然即将到来的新无线电技术将带来更多的空中接口带宽，但如果管理不当，带宽资源将无法满足未来用户的需求。为了解决在移动无线网络中提供满足用户QoS（服务质量）要求的高效和有效的无线多媒体服务的总体问题，我们计划通过从两个不同的层面和角度调查各种涉及的问题来提供一个集成的解决方案，这两个层面和角度与所考虑的网络相关的两个主要元素：无线性质和移动性。具体来说，考虑到多媒体用户的严格需求，为了实现本文提出的设计高效无线资源分配方法的主要目标，我们首先取消了用户数量无限、数据包长度固定的传统假设，在语音和数据用户数量有限、缓冲区有限、数据用户数据包长度可变的情况下，分析了更一般、更现实的无线系统性能。考虑到环境的无线特性和信道容量的变化，研究了一种有效的适应信道条件变化的数据速率调度方案，以最大限度地提高加权系统吞吐量。在信道容量变化的情况下，为了保证资源在竞争用户间的公平分配，采用了自适应补偿技术。此外，为了解决移动无线网络中的移动性和拥塞问题及其对用户QoS的影响，我们通过引入和研究以下额外维度来研究准入控制和切换过程的增强：灵活的高级带宽保留和重新配置，以优化带宽利用率，特别是在支持灵活QoS的业务时；定价与准入控制相结合，实现用户总效用最大化，缓解或最小化网络拥塞；设计了一个基于移动代理的系统，为实现这些管理流程和方案提供了灵活而全面的框架。提出的教育计划包括：本科和研究生教学；介绍新课程；研究生咨询和指导；本科项目督导；参与外展计划；在当地的技术高中讲课；最后，加强现有的实验室基础设施和设备。该教育计划的目标之一是创造一个有吸引力的研究和教育环境，在这个环境中，研究生和本科生都可以合作，共同学习和发现。此外，新泽西理工大学有相当多的少数民族和女性学生（分别为40%和18%），预计其中一些学生将有机会为这个项目做出贡献。最后，我期望拟议的计划将使我能够继续扩大我的职业发展中已经确立的国际层面。

The explosive growth of the Internet and the continued dramatic increase for all wireless services are fueling the demand for increased capacity, data rates, supported multimedia services, and support for different Quality of Service (QoS) requirements for different classes of services. Wideband CDMA (WCDMA) has been proposed as a key air interface technique for third generation (3G) wireless systems, and will continue to be adopted as a strong candidate for 4G systems that will provide differentiated services to multimedia traffic. With the capability of dynamically varying user channel rates, WCDMA systems can provide more flexibility in bandwidth allocation. Although the out-coming new radio technology will bring more bandwidth at air interface, if not managed properly, the bandwidth resources will not meet the requirements of future users.In order to address the overall problem of offering efficient and effective wireless multimedia services that meet the users' QoS (Quality of Service) requirements in mobile wireless networks we plan to provide an integrated solution by investigating the various involved problems from two different levels and angles which are aligned with the two main elements associated with the networks under consideration: wireless nature and mobility. Specifically, given the strict multimedia user requirements, in order to satisfy the main objective of this proposal of designing efficient wireless resource allocation methods we first remove the traditional assumptions of infinite number of users and fixed packet lengths, and analyze the wireless system performance under a more general and realistic case with finite population of voice and data users, finite buffers and variable packet length for data users. Given the wireless nature of the environment under consideration and the variations in the channel capacity, an efficient data rate scheduling scheme that adapts to the changing channel condition is investigated in order to maximize the weighted system throughput. An adaptive compensation technique is also employed in order to guarantee the fair allocation of resources among the competing users despite of the variation of channel capacity. Furthermore in order to deal with the issue of mobility and congestion in mobile wireless networks and their impact on the users' QoS, we study the enhancement of admission control and handoff process by introducing and investigating the following additional dimensions: flexible advanced bandwidth reservation and reconfiguration to optimize the bandwidth utilization especially when services with flexible QoS are supported; integration of pricing and admission control to maximize the users' total utility and alleviate or minimize the network congestion; design of a mobile agent based system to provide a flexible and comprehensive framework to implement these management processes and schemes.The proposed educational plan includes: undergraduate and graduate teaching; introduction of new courses; graduate student advising and mentoring; undergraduate project supervision; participation in an outreach program; lectures at local technical high schools; and finally, enhancement of existing laboratory infrastructure and facilities. Among the objectives of the education plan is to create an attractive research and educational environment in which both graduate and undergraduate students alike can collaborate and work together in order to learn and discover. Furthermore NJIT has a significant presence of minority and women students (~40% and ~18% respectively) and it is expected that some of these students will have the opportunity to contribute to this project. Finally I expect that the proposed plan will allow me to continue to expand on the already established international dimension of my career-development.