Throughput Analysis in Cache-enabled Millimeter Wave HetNets with Access and Backhaul Integration

TL;DR

This paper analyzes how caching at base stations in millimeter wave HetNets can significantly improve network throughput by offloading backhaul traffic and optimizing spectrum partitioning, using stochastic geometry for analytical modeling.

Contribution

It introduces a novel analytical framework for cache-enabled mmWave HetNets, optimizing spectrum and cache allocation to enhance throughput.

Findings

Caching can increase network throughput by up to 80%.

Spectrum partition and cache allocation significantly impact throughput.

Analytical SINR distributions are derived for LoS and NLoS paths.

Abstract

Recently, a mmWave-based access and backhaul integration heterogeneous networks (HetNets) architecture (mABHetNets) has been envisioned to provide high wireless capacity.Since the access link and the backhaul link share the same mmwave spectral resource, a large spectrum bandwidth is occupied by the backhaul link, which hinders the wireless access capacity improvement. To overcome the backhaul spectrum occupation problem and improve the network throughput in the existing mABHetNets, we introduce the cache at base stations (BSs). In detail, by caching popular files at small base stations (SBSs),mABHetNets can offload the backhaul link traffic and transfer the redundant backhaul spectrum to the access link to increase the network throughout. However, introducing cache in SBSs will also incur additional power consumption and reduce the transmission power, which can lower the network throughput.In this paper, we investigate spectrum partition between the access link and the backhaul link as well as cache allocation to improve the network throughput in mABHetNets. With the stochastic geometry tool, we develop an analytical framework to characterize cache-enabled mABHetNets and obtain the signal-to-interference-plus-noise ratio (SINR) distributions in line-of-sight (LoS) and non-line-of-sight (NLoS) paths. Then we utilize the SINR distribution to derive the average potential throughput(APT). Extensive numerical results show that introducing cache can bring up to 80% APT gain to the existing mABHetNets.