Random Caching Based Cooperative Transmission in Heterogeneous Wireless Networks

Abstract

Base station cooperation in heterogeneous wireless networks (HetNets) is a promising approach to improve the network performance, but it also imposes a significant challenge on backhaul. On the other hand, caching at small base stations (SBSs) is considered as an efficient way to reduce backhaul load in HetNets. In this paper, we jointly consider SBS caching and cooperation in a downlink largescale HetNet. We propose two SBS cooperative transmission schemes under random caching at SBSs with the caching distribution as a design parameter. Using tools from stochastic geometry and adopting appropriate integral transformations, we first derive a tractable expression for the successful transmission probability under each scheme. Then, under each scheme, we consider the successful transmission probability maximization by optimizing the caching distribution, which is a challenging optimization problem with a non-convex objective function. By exploring optimality properties and using optimization techniques, under each scheme, we obtain a local optimal solution in the general case and global optimal solutions in some special cases. Compared with some existing caching designs in the literature, e.g., the most popular caching, the i.i.d. caching and the uniform caching, the optimal random caching under each scheme achieves better successful transmission probability performance. The analysis and optimization results provide valuable design insights for practical HetNets.

30 pages, 7 figures, submitted to ICC, TWC

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• Enhancing Performance of Random Caching in Large-Scale Wireless Networks with Multiple Receive Antennas
• Joint and Competitive Caching Designs in Large-Scale Multi-Tier Wireless Multicasting Networks
• Energy-Efficient Caching for Scalable Videos in Heterogeneous Networks
• Edge Caching in Dense Heterogeneous Cellular Networks with Massive MIMO Aided Self-backhaul
• Enhancing Performance of Random Caching in Large-Scale Heterogeneous Wireless Networks with Random Discontinuous Transmission