Statistical Delay-Bounded Quality-of-Service Guarantee for Time-Sensitive Multimedia Transmissions over Cooperative Wireless Networks

在下一代移动无线网络中，最重要的业务之一是实时传输多媒体数据，包括视频和音频。然而，多媒体数据需要在被称为延迟界的所需时间段内被及时传送，因为任何接收到的多媒体数据超过其延迟界都被认为是无用的并被丢弃。但是，由于随机时变的无线信道和干扰，对于大容量的多媒体无线传输来说，确定性的时延约束要求实际上是不可行的。因此，统计时延受限的服务质量(Qos)保证理论被提出作为一种替代方案来实现无线多媒体传输，其中我们以较小的违反概率来保证时延界限。能够在协作无线网络上提供统计时延受限的服务质量保证并减轻干扰的技术的可用性将是下一代无线网络研究的一个突破。本研究的目的是对如何扩展和实现统计时延受限的服务质量保证理论进行基础研究，以支持干扰缓解的协作无线网络中的多媒体业务。工程方法在于开发基于跨层优化和协作分布式多天线的体系结构和算法，以支持统计时延受限的服务质量保证。该框架将为推导干扰抑制协作无线网络中最优功率控制的协作有效容量和博弈论奠定基础。此外，建议的研究将与PI在德克萨斯农工大学开发新的研究生/本科课程/课程实验室的教育计划很好地结合起来。尽管统计延迟受限的Qos保证理论已经被证明是支持移动无线网络上对时间敏感的多媒体传输的一种强大的技术和有用的性能指标，但如何通过使用各种新兴的先进无线通信技术来有效地应用和实施该技术/性能指标还没有得到很好的理解和深入的研究。为了克服上述挑战，本项目提出通过跨层设计开发一套基于协作-无线网络的架构、算法和方案，以支持移动用户多样化的统计时延受限的服务质量和用户主观体验质量(QOE)要求，同时缓解共存链路和移动用户协作造成的干扰。提出的框架将主要基于协作分布式多输入多输出(MIMO)系统，以增加多媒体无线网络的覆盖和容量。但是，协作分布式MIMO网络在协作、资源分配和不同移动用户的时延受限的QOS/QOE保证方面提出了新的设计问题。此外，由于多个协作用户，发射功率分布在不同位置的多个发射机上。因此，协作造成的干扰范围大大扩大，降低了空间频率重用效率，从而降低了无线网络的S容量。针对上述问题，PI提出了以下研究计划、目标和活动：1)在协作分布式MIMO系统中开发统计延迟-Qos/延迟-QOE感知的跨层结构以优化基站选择；2)开发基于统计-延迟-QOS/延迟-QOE驱动的协作有效容量和协作博弈理论框架，用于优化功率控制算法和干扰管理；3)设计抗干扰协作无线网络编码方案，以增强多跳adhoc无线网络中统计-延迟-Qos/延迟-QOE保证；4)通过考虑时延边界违规和缓冲区溢出概率，将二维时延-QOE表征扩展到三维时延-QOE表征；5)开发建模和分析技术，并开发仿真工具/测试床来验证和评估所提出的移动网络的体系结构、理论、算法和方案。

One of the most important services in the next-generation mobile wireless networks is to transmit real-time multimedia data, including video and audio. However, multimedia data need to be timely delivered within the required time period called delay-bound, because any received multimedia data exceeding its delay bound is considered useless and discarded. But, because of randomly time-varying wireless channels and interferences, the deterministic delay-bound requirements for high-volume multimedia wireless transmissions are practically infeasible. Thus, the statistical delay-bounded quality of service (QoS) guarantee theory is developed as an alternative solution to achieve wireless multimedia transmissions where we guarantee the delay-bound with a small violation probability. Availability of techniques capable of statistical delay-bounded QoS guarantee over cooperative wireless networks with mitigated interference would be a breakthrough in the next-generation wireless network research. The objective of this research is to conduct the basic studies on how to extend and implement the statistical delay-bounded QoS guarantee theory for supporting multimedia traffics over interference mitigated cooperative wireless networks. The engineering approach lies in the development of cross-layer optimization and cooperative distributed multi-antenna based architecture and algorithms to support the statistical delay-bounded QoS guarantee. The proposed framework will form a basis for deriving the novel cooperative effective-capacity and game theories for optimal power control over interference-mitigated cooperative wireless networks. Also, the proposed research will be well integrated with PI's educational plan in developing the new graduate/undergraduate curricula/course-labs at Texas A&M University.While the statistical delay-bounded QoS guarantee theory has been shown to be a powerful technique and useful perform metric for supporting the time-sensitive multimedia transmissions over mobile wireless networks, how to efficiently apply and implement this technique/performance-metric through employing various emerging advanced wireless communications technologies has neither been well understood nor thoroughly studied. To overcome the above challenge, this project proposes to develop a set of cooperative-wireless networking based architectures, algorithms, and schemes through cross-layer design to support diverse statistical delay-bounded QoS and users' subjective measure of quality of experience (QoE) requirements for mobile users, while mitigating the interferences caused by coexisting links and mobile user cooperation. The proposed framework will be mainly based on the cooperative distributed multiple-input-multiple-output (MIMO) system to increase the coverage and capacity for multimedia wireless networks. But, the cooperative distributed MIMO network imposes new designing issues on the coordination, resource allocation, and diverse mobile users' delay-bounded QoS/QoE guarantees. Furthermore, due to multiple cooperative users, the transmit power is distributed over multiple transmitters at different locations. Consequently, the interfering range caused by cooperation is considerably enlarged, lowering the spatial frequency-reuse efficiency and thus decreasing wireless network?s capacity. To solve the aforementioned problems, the PI proposes the following research plans, goals, and activities: 1) Develop statistical delay-QoS/delay-QoE aware cross-layer architecture for optimal base-station selection in the cooperative distributed MIMO system; 2) Develop statistical delay-QoS/delay-QoE driven cooperative-effective-capacity and cooperative-game theories based framework for optimal power control algorithms and interference management; 3) Design interference-mitigated cooperative wireless network-coding schemes to enhance the statistical delay-QoS/delay-QoE guarantees in multi-hop Ad Hoc wireless networks; 4) Extend two-dimension to three-dimension delay-QoE characterization by taking into account the delay-bound violation and buffer-overflow probabilities; 5) Develop modeling and analysis techniques, and simulation-tools/testbeds to validate and evaluate the proposed mobile networks' architectures, theories, algorithms, and schemes.