D2D网络中基于SVC视频流缓存的跨层网络编码重传方案  

A cross-layer network coding retransmission scheme based on SVC for video stream caching in D2D networks

作　　者：姚玉坤[1] 陈鑫垚 羊杰 YAO Yukun;CHEN Xinyao;YANG Jie(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《南京邮电大学学报（自然科学版）》2023年第1期11-19,共9页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金(61971080)资助项目。

摘　　要：为了降低基站重传视频流的完成时间,针对视频流业务设计了一种D2D网络中基于可伸缩视频编码(Scalable Video Coding, SVC)的视频流缓存跨层网络编码重传方案。该方案首先采用SVC对视频流进行编码以应对终端处理能力的差异性,引入跨层网络编码搜寻最大独立集选取最佳的传输以及编码调度,减少完成时间。其次,针对多协作重传设备间的干扰问题,设计了最佳的资源调度算法,在给定发送设备集的前提下迭代优化设备的发送功率,在不增加完成时间的同时优化系统的吞吐量。仿真结果表明,所提出的方案能够有效地降低完成时延,减少重传次数,增加系统的弹性。In order to reduce the time of video stream retransmission of base stations, this paper designs a cross-layer network coding retransmission scheme based on scalable video coding(SVC) for video stream caching in D2D networks. First, this scheme uses SVC to encode the video stream to cope with the differences of terminal processing capabilities. It then introduces the cross-layer network coding to search for the largest independent set, and selects the best transmission and coding schedule to reduce the time span. Second, since the interference problem exists between multiple cooperative retransmission devices, an optimal resource scheduling algorithm is designed. Given a set of transmitting devices, it iteratively optimizes the transmit power of the devices, and optimizes the throughput of the system without increasing the time. The simulation results demonstrate that the proposed scheme can effectively reduce the time delay and the number of retransmissions, as well as increase the robustness.

关 键 词：D2D网络 可伸缩视频流 跨层网络编码 完成时间 吞吐量 

分 类 号：TN919[电子电信—通信与信息系统]