摘要
为了提高视频多播传输的可靠性,分析了覆盖区域发生重叠的访问点间相互协作对于提高系统增益和系统公平性的作用,提出一种基于网络编码和多访问点协作的视频多播方案。该方案首先将每个视频划分为大小相同的报文段,并利用RLNC机制对每个段的报文进行编码;然后以使用户接收到的报文数量的期望值最大化的同时实现公平调度为目标,考虑了访问点间的完全干扰和非完全干扰两种模型,将访问点间的传输范围发生重叠时的视频多播问题建模为线性规划优化问题,提出了双阶段启发式算法来进行求解。该算法利用多个访问点来获取空间和时间分集增益,提高了数据传输的可靠性;通过允许发生干扰的访问点并行传输数据,提高了系统效用。最后的仿真实验也验证了方案在接收报文总量、解码报文数量和公平性方面的有效性。
Due to the reliability of wireless network links between interference is low,in order to improve the reliability of video multicast transmission,this paper analysed the effect of the access points overlapped in coverage area for improving the system gain and system fairness by using mutual cooperation.This paper proposed a video multicast scheme based on network coding and coordinated multiple access points.In this scheme,it divided each video into the equal size packet segments,and coded the packets of each segment by the random linear network coding(RLNC)mechanism.The goal was to have a fair scheduling that maximized the expected number of packets that the users received.It considered the complete interference and the non-complete interference between access points,modeled the video multicast problem when the transmission range overlap occured as the linear programming optimization problem,and proposed two-stage heuristic algorithm to solve this problem.Through the use of multiple access points to obtain the spatial and temporal diversity gain,it improved the reliability of data transmission,and through allowing the access point with interference to parallelly transmit data,it improved the system s effectiveness.Finally,the simulation results verify the effectiveness of the proposed scheme in terms of the total amount of the received pac-kets,the number of decoded packets and the fairness.
作者
廖金菊
冯光辉
Liao Jinju;Feng Guanghui(School of Information Engineering,Zhengzhou University of Industrial Technology,Zhengzhou 451150,China)
出处
《计算机应用研究》
CSCD
北大核心
2018年第1期226-231,共6页
Application Research of Computers
基金
河南省基础与前沿技术研究计划资助项目(142300410283)
河南省软科学研究计划资助项目(142400410179)
河南省教育厅科学技术研究重点资助项目(12B520063
14B520065)
河南省高等学校青年骨干教师资助计划项目(2013GGJS-230)
关键词
视频多播
网络编码
多访问点协作
线性规划
启发式算法
公平性
video multicast
network coding
coordinated multiple access points
linear programming
heuristic algorithm
fairness
