论文标题
无线网络中的多播速率辅助流媒体流的最佳带宽分配
Optimal Bandwidth Allocation for Multicast-Cache-Aided on-Demand Streaming in Wireless Networks
论文作者
论文摘要
我们考虑了用于流媒体内容的混合交付方案，结合了启用了基于缓存的正交多点多播（OMPMC）和点按需单点Unicast（SPUC）用于异质网络的单点。 OMPMC服务通过整个网络将缓存的文件传输到有兴趣的用户，而该服务不满足的用户将分配给SPUC服务，以单独服务。 SPUC从核心网络中获取所请求的文件，并使用蜂窝光束成型的传输将其单构成UES。我们优化了交付方案，以最大程度地减少网络中的平均资源消耗。我们在OMPMC组件的缓存放置和资源分配以及SPUC组件的多用户横梁成形方案方面提出了一个约束的优化问题。我们应用一种路径遵循方法来找到最佳的流量卸载解决方案。该解决方案描绘了消费资源的总量与服务中断概率之间的对比。模拟结果表明，与文献相比，混合方案在网络范围的消费资源数量与服务中断概率之间提供了更好的权衡。
We consider a hybrid delivery scheme for streaming content, combining cache-enabled Orthogonal Multipoint Multicast (OMPMC) and on-demand Single-Point Unicast (SPUC) transmissions for heterogeneous networks. The OMPMC service transmits cached files through the whole network to interested users, and users not being satisfied by this service are assigned to the SPUC service to be individually served. The SPUC fetches the requested files from the core network and unicasts them to UEs using cellular beamforming transmissions. We optimize the delivery scheme to minimize the average resource consumption in the network. We formulate a constrained optimization problem over the cache placement and resource allocation of the OMPMC component, as well as the multi-user beamforming scheme of the SPUC component. We apply a path-following method to find the optimal traffic offloading solution. The solutions portray a contrast between the total amount of consumed resources and service outage probability. Simulation results show that the hybrid scheme provides a better tradeoff between the amount of network-wide consumed resources and the service outage probability, as compared to schemes from the literature.
