CIF: Small: Communication Theory Foundations and System Optimization of Femto-Caching and D2D Networks for Wireless Video

视频流正在迅速成为无线网络中数据流量的主要来源。为了避免过度负担的蜂窝基础设施，这个项目研究新的系统，利用缓存提供高吞吐量与最小的基础设施成本。这是通过利用点播视频的异步内容重用来实现的，即，大多数人看同样的视频，虽然在不同的时间。考虑了在无线边缘进行这种缓存的两种方法，即部署助手站（具有缓存但没有回程的毫微微基站），或者在用户设备上进行缓存以及高频谱效率的设备到设备（D2 D）通信。研究将考虑以下主要主题：（i）开发用于优化无线流传输中的视频质量的策略，（ii）研究用于相邻设备之间的单跳传输的调度，（iii）研究用于将D2 D与编码多播方案组合的D2 D传输的编码。为了补充这些理论研究，现实的运营条件（渠道，用户分布等）。将通过模拟进行分析。这项工作的结果将允许更频谱有效的无线视频传输。这将增加整体视频观看量，有利于电影/娱乐业，这是美国的一个关键工业部门。此外，所建议的系统还可以释放许多无线资源，这些无线资源可以更有效地用于其他目的。

Video streaming is fast becoming the dominant source of data traffic in wireless networks. In order to avoid overburdening the cellular infrastructure, this project investigates new systems that exploit caching to provide high throughput with minimal infrastructure cost. This is pursued by exploiting the asynchronous content reuse of on-demand video, i.e., that most people watch the same videos, though at different times. Two approaches to such caching at the wireless edge ar considered, either deploying helper stations (femto-base stations with a cache, but no backhaul), or caching on user devices together with highly spectrally efficient device-to-device (D2D) communications. The investigations will consider the following main topics: (i) develop policies for optimizing video quality in wireless streaming, (ii) investigate scheduling for single-hop transmission between neighboring devices, (iii) investigate coding for D2D transmission for combining D2D with coded multicast schemes. To complement these theoretical investigations, realistic operating conditions (channels, user distributions, etc.) will be analyzed through simulations.The result of this work will allow more spectrally efficient transmission of wireless video. This will increase overall video consumption, which is beneficial to the movie/entertainment industry, a key US industrial sector. Furthermore, the suggested systems can also free up many wireless resources that can be more efficiently used for other purposes.