部分信道信息下SVC可伸缩编码分层组播传输新机制

无线多媒体网络中，多媒体业务种类繁多、流量大、QoS需求各异。组播组用户位置随机分布及动态变化、导致部分用户的信道状况变得很差，而组播系统容量受限于最差信道用户。当用户数较多时，反馈开销问题也亟待解决。为此，需要从无线传输技术方面进行创新，从根本上解决无线组播系统频谱有效性和功率有效性问题，满足系统多媒体应用多样化和高带宽需求。本项目将开展新型无线组播传输理论与技术创新研究，运用信息论，对分层传输组播系统的频谱效率和功率效率进行理论分析，拟创建SVC可伸缩编码分层组播传输新机制，最大限度的匹配无线信号的广播特性及挖掘高信噪比用户的信道潜能；设计组播传输实用化的反馈新机制，降低反馈用户数和用户反馈量；建立用户端选择的机会组播新机制，通过机会调度提高SVC增强层平均吞吐量，并减少时延。形成较为完整的新型无线组播传输理论及技术体系，为4G之后的移动通信系统提供理论基础和技术支撑。

In wireless multimedia multicast network, multimedia services have many types, large traffic and different QoS requirements. The location of multicast group users randomly distributed and dynamic changes, which leads to some user's channel condition deteriorated, and multicast system capacity is limited by the worst channel users. When number of users is more, feedback overhead problems need to be solved urgently. Therefore, we need to start from the wireless transmission technology innovation, and fundamentally solve system spectrum efficiency and power efficiency in the wireless multicast system, in order to meet the system multimedia applications variety and high bandwidth requirements. This project will develop new wireless multicast transmission theory and technology innovation research, using information theory, theoretical analysis of the layered transmission multicast system spectral efficiency and power efficiency. We intend to create novel SVC layered transmission multicast mechanism, the maximum matching wireless signal radio characteristics and mining high SINR user channel potential. We design multicast transmission practical feedback mechanism to reduce the the feedback user number, and the amount of user feedback. We establish novel opportunity multicast mechanism of user to choose, through the opportunity scheduling improve the SVC enhancement layer average throughput and reduce delay. Develop relatively complete new wireless multicast transmission theory and technology system, and provide theoretical basis and technical support for the beyond 4G mobile communication system.