面向NOMA视频多播的缓存和频谱分配  

Caching and spectrum allocation for NOMA video multicast

作　　者：唐昊 吉晓祥 沈航 田一博 白光伟 TANG Hao;JI Xiao-xiang;SHEN Hang;TIAN Yi-bo;BAI Guang-wei(College of Computer Science and Technology,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学计算机科学与技术学院,江苏南京211816

出　　处：《计算机工程与设计》2023年第1期15-21,共7页Computer Engineering and Design

基　　金：国家自然科学基金项目(61502230);江苏省自然科学基金项目(BK20201357);江苏省“六大人才高峰”高层次人才基金项目(RJFW-020);江苏省研究生科研与实践创新计划基金项目(KYCX21_1141、KYCX21_1140)。

摘　　要：为提高用户接收视频的质量,提出一种面向NOMA无线视频多播的分层内容缓存和频谱分配框架。该框架综合考虑缓存资源、功率资源和带宽资源的联合分配,目的是在多维资源约束下,最大化多播组内用户的整体视频接收质量。将频谱分配和分层视频缓存建模为一个混合整数线性规划问题。在此基础上,将该优化问题解耦为组内频谱约束和缓存约束的资源分配子问题。设计基于动态规划的频谱分配算法和多播组内分层内容缓存算法。仿真结果表明,提出方案在资源利用率和视频接收质量等方面优于现有的方法。A joint content caching and spectrum allocation framework for NOMA wireless video multicast was proposed to improve the quality of video received by users.The joint allocation of cache resources,power resources,and bandwidth resources were comprehensively considered,to maximize the overall video reception quality of users in the multicast group under the constraints of multi-dimensional resources.The spectrum allocation and hierarchical video buffering were modeled as a mixed integer linear programming problem.On this basis,the optimization problem was decoupled into the sub-problems of resource allocation of spectrum constraints and buffer constraints within the group.A spectrum allocation algorithm based on dynamic programming and a hierarchical content caching algorithm in a multicast group were designed.Simulation results show that the proposed scheme is superior to the existing methods in terms of resource utilization and video reception quality.

关 键 词：非正交多址 可伸缩视频编码 多播 分层视频缓存 动态规划 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]