面向缓存网络内容分发的非正交传输策略研究

Research on non-orthogonal transmission strategy for content delivery in caching networks

面向无线缓存网络的内容分发场景,设计了一种两阶段自适应非正交/正交多址接入传输方案。针对该方案,提出了一种高可靠性用户调度策略,并通过理论分析得出了中断概率的解析表达式及其高信噪比下渐近表达式。分析结果表明,该策略可获得满空间分集增益。仿真结果表明,与基于瞬时信道状态信息的调度策略、随机调度策略以及传统的正交多址接入传输策略相比,所提策略可通过获取空间分集增益,实现优于现有策略的内容分发可靠性。

A two-stage adaptive non-orthogonal/orthogonal multiple access transmission scheme was designed for content delivery scenarios in wireless caching networks.For the scheme,a high-reliability user scheduling strategy was proposed,and the analytical expression of the outage probability and its asymptotic expression in high signal-to-noise ratio regime were derived by theoretical analysis.The analysis results indicate that the proposed strategy can achieve full spatial diversity gain.Simulation results demonstrate that compared with the instantaneous channel state information-based scheduling strategy,the random scheduling strategy,and the conventional orthogonal multiple access transmission strategy,the proposed strategy can achieve better content delivery reliability than existing strategies by obtaining the spatial diversity gain.