Caching in large wireless networks

Caching in large wireless networks

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In this chapter we study the fundamental theoretical underpinnings of wireless networks with caching capabilities. More specifically: 1. We present an analytical tool for simplifying the calculations required to decide the optimal content replication in a wireless network. This tool is used to derive the asymptotic laws of backhaul capacity scaling for multihop wireless networks. The presented results consider (i) the number of networks nodes N, (ii) the number of contents M, and (iii) the cache size K as the key system “size”parameters that increase arbitrarily at different proportions. By studying the different cases we extract valuable intuition into the benefits of caching for the sustainability of wireless networks. 2. We investigate the performance of dense cache-enabled small cell networks and provide useful insights on how the system operating values, the network topology and the interference affect the network performance. Using tools from stochastic geometry to model the node distribution, we provide guidelines where to place the most popular content, i.e., at the mobile device or at the AP/BS. The effect of spatial correlation in content requests is also analysed. 3. The chapter is concluded with a summary of interesting research directions for the future that can play a crucial role in the proliferation of caching as a wireless network technique.

Chapter Contents:

  • 7.1 Introduction
  • 7.2 Sustainable multihop wireless networks with caching
  • 7.2.1 System model
  • Network model
  • Content requests
  • Caching model
  • 7.2.2 Multihop capacity optimization: relaxation and rounding
  • Joint replication-routing problem
  • Relaxed density-based problem
  • Discrete density (rounding)
  • 7.2.3 Asymptotic laws for Zipf popularity
  • 7.2.4 Scaling laws for constant cache size K
  • 7.2.5 Scaling the cache size K → ∞
  • "High" K
  • "Low" K
  • 7.2.6 Discussion about the sustainability of wireless caching networks
  • 7.3 Cache-enabled small cell networks
  • 7.3.1 Cache-enabled SCNs with local user interest correlation
  • System model
  • Performance analysis
  • Numerical results
  • 7.3.2 D2D caching vs. small cell caching
  • Network model
  • Performance analysis
  • Power consumption
  • Numerical results
  • Discussion
  • 7.4 Research challenges for wireless caching
  • 7.4.1 Modelling the requests in wireless networks
  • 7.4.2 Coded caching for broadcast medium exploitation
  • 7.4.3 Cooperative caching models
  • 7.4.4 Advanced spatial models
  • References

Inspec keywords: cache storage; geometry; radiofrequency interference; stochastic processes; radio networks; cellular radio; telecommunication network topology

Other keywords: network topology; interference; backhaul capacity scaling; stochastic geometry; node distribution; mobile device; dense cache-enabled small cell networks; spatial correlation effect; cache size; multihop wireless networks; large wireless networks; analytical tool; network performance

Subjects: Other topics in statistics; Communication network design, planning and routing; Mobile radio systems; Combinatorial mathematics; Electromagnetic compatibility and interference

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