面向复杂城市环境的移动机会网络视频传输机制研究

Due to the content richness and legibility, video data is becoming an important information carrier on the mobile Internet. Fully utilizing the communication opportunities arising from node contacts, video transmission through Mobile Opportunistic Networks (MONs) can not only provide services for the public with more convenient and inexpensive way, but also offload traffic efficiently from traditional mobile wireless communication networks, such as Wi-Fi and Cellular Networks. In this project, aiming at the three challenges of low-quality transmission environment incurred by the weak network connectivity and ubiquitous wireless interference, the limited energy supply of mobile intelligent terminals, and excessive transmission overhead, we investigate the issue of video transmission in MONs under complex urban environments from the three aspects of routing algorithm, transmitting power coordination scheme and packet copying control method. A series of key theories and technologies are proposed, such as optimal relay selection policy for ultra-dense scenario, adaptive selection for video transmission mode, game-based nodal power control, etc. Through the implementation of this project, we will resolve the following three key scientific problems: video delivery with high quality under low-quality environment, power cooperation among uncontrolled nodes under wireless interference environment, and the balance of video transmission quality and overhead. Based on the formulation of above more practical models and algorithms, the project will promote more intensive use of video services based on MONs in complex urban environments.

视频数据由于其内容的丰富性和直观易读性逐渐成为移动互联网中非常重要的信息载体。充分利用智能终端间的机会接触通过移动机会网络进行视频数据传输不仅能够以更加便捷、低廉的方式给公众提供服务，同时还可以实现对传统无线通信网络的流量卸载。本项目围绕复杂城市环境中的视频机会传输问题，针对由低质的传输环境、受限的移动设备能量供给、过高的视频传输开销等所带来的挑战，拟从视频机会路由、节点传输功率协同、数据包副本扩散控制等三个方面展开研究，提出超密集场景下的中继节点选择策略、视频传输模式自适应判决方法、基于博弈论的节点功率自适配算法和最优停止的备份控制机制等一系列新的方法和技术，重点解决复杂城市环境中高效视频投递、干扰环境下非受控节点间低能耗的视频传输协作、视频机会传输质量负载均衡等关键科学问题。本项目拟通过设计更加实际的模型、算法和机制以推动基于移动机会网络的视频服务在复杂城市环境中的应用。

视频数据由于其内容的丰富性和直观易读性逐渐成为移动互联网中非常重要的信息载体。充分利用智能终端间的机会接触通过移动机会网络进行视频数据传输不仅能够以更加便捷、低廉的方式给公众提供服务，同时还可以实现对传统无线通信网络的流量卸载。依照项目计划书，本课题主要围绕“城市复杂网络环境下视频数据高效投递”、“城市复杂无线环境下非受控节点间视频传输协同”和“城市视频机会传输中的质量负载均衡”三个关键科学问题，在对移动机会网络视频传输进行建模的基础上，从视频传输路由算法设计、视频传输信道干扰控制和视频传输副本扩散控制等三个方面展开研究，完成了视频机会质量建模、最优缓存中继节点选择、自适应的视频中继协同策略、机会传输失真建模、密集干扰环境下的中继节点选择、视频边缘质量增益模型、多用户博弈的副本控制算法设计、基于几何角度的求解方法等一系列成果，在国内外重要学术期刊发表文章30篇，提交发明专利4项，为基于移动机会网络的视频服务在复杂城市环境中的应用与推广奠定理论基础。