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Distributed User Association and Resource Allocation Algorithms for Three Tier HetNets | IEEE Journals & Magazine | IEEE Xplore

Distributed User Association and Resource Allocation Algorithms for Three Tier HetNets


Abstract:

In this article, we consider joint optimization of user association and resource allocation in three tier HetNets. We formulate the objective of minimizing the resources ...Show More

Abstract:

In this article, we consider joint optimization of user association and resource allocation in three tier HetNets. We formulate the objective of minimizing the resources required to clear a given set of files, as a linear program. We show that the optimal user association is determined by a rate-biasing rule, where a bias value is associated with each BS. We show that each rate-bias value crucially only takes values from a finite set which we characterize. We present a complete analytical solution along with new structural results. Using these results, we present efficient distributed algorithms for optimal control of three tier HetNets. The method involves a 1D search for a resource variable at the macro-level, and 2D search at the pico-level for a resource variable and a bias value. We apply our results to a variety of hierarchical network examples.
Published in: IEEE Transactions on Wireless Communications ( Volume: 19, Issue: 12, December 2020)
Page(s): 7913 - 7926
Date of Publication: 24 September 2020

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I. Introduction

Heterogeneous Networks (HetNets) consist of low power base stations (BSs) such as pico cells and femto cells deployed to operate in same region as the traditional macro cellular infrastructure [1]. These small cells increase the capacity due to better spatial re-use of spectrum. Future 5G networks are expected to be even more heterogeneous with wireless access to user equipments (UEs) simultaneously available via multiple technologies, including new technologies such as mmWave and aerial BSs. As demand increases and cells get smaller, there will be an increased number of tiers in future HetNet architectures.

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