面向业务的无线网络编码多播机制研究

网络编码和多播相结合，能够增大网络容量、减小传输时延，是无线通信的研究热点。然而，当前的网络编码多播方法大都面向网络传输特性对传统服务质量参数进行优化设计，虽然对传输性能有一定提升，但无法提供用户满意的服务质量，限制了网络编码多播在无线业务中的应用。.本课题目标是利用网络编码多播技术为无线业务提供可靠的服务质量保证和良好的用户体验。从分析业务数据特征和属性入手，研究影响服务质量和用户体验的关键因素并将其融入到多播方案设计的核心环节中去，重点解决以下科学问题：1）体现业务数据特征并满足其相应服务质量需求的网络编码问题；2）联合网络编码，保证编码有效性的高效低开销反馈机制设计问题。本项目意义在于从面向业务的角度出发，将数据特征和业务属性引入网络编码和反馈机制设计中，极大地提高网络编码性能增益及反馈效率，保证服务质量，不仅能促进网络编码多播理论和方法的研究，而且能够为实际应用提供技术支持和指导。

Network coding-based wireless multicast has attracted more and more research focus due to the capability of increasing network capacity and reducing transmission delay. However, current methods of network coding-based wireless multicast primarily aim to optimize traditional quality of service parameters with considerations of the network transmission property. Despite the improvement of transmission performance, this kind of methods cannot provide user satisfying quality of service, thus limits the application of network coding-based multicast in wireless service..This proposal aims at providing good quality of service and user experience for wireless service by exploiting network coding-based multicast technology. Starting from the analysis of data characteristics and properties, we focus on the keys that affect the quality of service mostly and respect them through the design of multicast method. Two scientific problems are discussed in the proposal, one is how to respect the data characteristics and to realize the quality of service during the network coding process, and the other is the design of cost-effective feedback methods that combines network coding to assure the effectiveness of proposed network coding methods. The significance of this proposal lies in that the service-oriented methods consider data characteristics and service properties during the network coding and feedback processes, thus increase the performance gain of network coding and the efficiency of feedback, and guarantee the quality of service. This proposal will not only promote the research on the theories and methods of network coding-based multicast, but also provide technical support and reference for the applications.