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Optimal Cooperative Content Caching and Delivery Policy for Heterogeneous Cellular Networks

机译:异构蜂窝网络的最佳合作内容缓存和传递策略

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摘要

To address the explosively growing demand for mobile data services in the 5th generation (5G) mobile communication system, it is important to develop efficient content caching and distribution techniques, aiming at significantly reducing redundant data transmissions and improving content delivery efficiency. In heterogeneous cellular network (HetNet), which has been deemed as a promising architectural technique for 5G, caching some popular content items at femto base-stations (FBSs) and even at user equipment (UE) can be exploited to alleviate the burden of backhaul and to reduce the costly transmissions from the macro base-stations to UEs. In this paper, we develop the optimal cooperative content caching and delivery policy, for which FBSs and UEs are all engaged in local content caching. We formulate the cooperative content caching problem as an integer-linear programming problem, and use hierarchical primal-dual decomposition method to decouple the problem into two level optimization problems, which are solved by using the subgradient method. Furthermore, we design the optimal content delivery policy, which is formulated as an unbalanced assignment problem and solved by using Hungarian algorithm. Numerical results have shown that the proposed cooperative content caching and delivery policy can significantly improve content delivery performance in comparison with existing caching strategies.
机译:为了满足第五代(5G)移动通信系统中对移动数据服务爆炸性增长的需求,开发有效的内容缓存和分发技术非常重要,目的是显着减少冗余数据传输并提高内容交付效率。在被认为是5G的一种有前途的架构技术的异构蜂窝网络(HetNet)中,可以利用在毫微微基站(FBS)甚至用户设备(UE)缓存一些受欢迎的内容项来减轻回程的负担。并且减少从宏基站到UE的昂贵传输。在本文中,我们开发了最优的协作内容缓存和交付策略,为此,FBS和UE都参与本地内容缓存。我们将协作内容缓存问题表述为整数线性规划问题,并使用分层的原始对偶分解方法将问题分解为两个级别的优化问题,这些问题通过使用次梯度方法得以解决。此外,我们设计了最佳的内容交付策略,该策略被表述为不平衡分配问题,并使用匈牙利算法进行求解。数值结果表明,与现有的缓存策略相比,所提出的协作内容缓存和分发策略可以显着提高内容分发性能。

著录项

  • 来源
    《IEEE transactions on mobile computing》 |2017年第5期|1382-1393|共12页
  • 作者

    Wei Jiang; Gang Feng; Shuang Qin;

  • 作者单位

    National Key Lab of Science and Technology on Communications and the Center for Cyber Security, University of Electronic Science and Technology of China, Chengdu, China;

    National Key Lab of Science and Technology on Communications and the Center for Cyber Security, University of Electronic Science and Technology of China, Chengdu, China;

    National Key Lab of Science and Technology on Communications and the Center for Cyber Security, University of Electronic Science and Technology of China, Chengdu, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mobile computing; Femtocells; Servers; Signal to noise ratio; 5G mobile communication;

    机译:移动计算;毫微微小区;服务器;信噪比;5G移动通信;

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