异构无线网络中基于非正交多址的可伸缩视频多播机制  

Non-orthogonal Multiple Access Enabled Scalable Video Multicast in HetNets

作　　者：吉晓祥 沈航 白光伟[1] JI Xiao-xiang;SHEN Hang;BAI Guang-wei(College of Computer Science and Technology,Nanjing Tech University,Nanjing 211816,China;State Key Laboratory for Novel Software Technology,Nanjing University,Nanjing 210093,China)

机构地区：[1]南京工业大学计算机科学与技术学院,南京211816 [2]南京大学计算机软件新技术国家重点实验室,南京210093

出　　处：《计算机科学》2021年第11期356-362,共7页Computer Science

基　　金：国家自然科学基金(61502230);江苏省自然科学基金(BK20150960);江苏省“六大人才高峰”高层次人才资助项目(RJFW-020);南京大学计算机软件新技术国家重点实验室资助项目(KFKT2017B21)。

摘　　要：文中提出了异构无线网络下基于非正交多址的可伸缩视频多播的资源管理框架。该框架综合考虑了不同基站间的频谱切分、切片内多播组之间的频谱分配和多播组内的发射功率分配,目的是最大化多播组所有用户设备的整体视频质量。考虑到每个多播组请求视频的不同、不同的用户设备位置和小基站间的干扰,将联合资源管理问题转化为一个整数线性规划问题,并将该优化问题解耦为多播组内发射功率划分问题和基站间频谱切分与基站内多组频谱资源分配问题。前者通过多重循环求得了叠加编码每一层所需的最优发射功率,后者通过背包算法得到了最优的解。仿真结果表明,所提方案在频谱利用率和用户设备平均视频质量方面优于现有方案。In this paper,a resource management framework is presented for non-orthogonal multiple access(NOMA)-enhanced scalable video coding(SVC)multicast in heterogeneous networks(HetNets).In this framework,radio spectrum slicing for different base stations,spectrum partition for multiple groups within each spectrum slice,and transmit power division within each multicast group are jointly considered,to maximize the overall video quality experienced by user equipment in multicast groups.For tractability,the joint resource management problem is formulated as an integer linear programming problem,with the consideration of different video requests,varying device locations,and inter-cell interference.The formulated optimization problem is decoupled into an intra-group transmit power division problem and a multi-group spectrum partition and inter-slice spectrum partition problem.The former subproblem obtains the optimal transmitting power for each layer of superposition coding through multiple cycles.The latter subproblem is solved optimally by the knapsack algorithm.Simulation results show that the proposed scheme is superior to the existing scheme in spectral efficiency and average video quality of each user equipment.

关 键 词：非正交多址 可伸缩视频编码 多播 异构无线网络 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]