Robust and Energy-Efficient User Association and Traffic Routing in B5g Hetnets

37 Pages Posted: 12 Mar 2022

See all articles by Agapi Mesodiakaki

Agapi Mesodiakaki

affiliation not provided to SSRN

Enrica Zola

affiliation not provided to SSRN

Andreas Kassler

Karlstad University

Abstract

Next generation cellular networks, i.e., Beyond Fifth Generation (B5G) and Sixth Generation (6G) networks, aim to significantly increase capacity by deploying a massive amount of Small Cells (SCs) and leveraging Millimeter Wave (mmWave) links that have large bandwidth availability. However, as optical connections to a large number of Base Stations (BSs) is not cost-effective, wireless Backhaul (BH) links may be used to connect SCs to the core network using mmWave frequencies, forming multi-hop mesh BH paths. While very flexible in deployment, the uncertainty in user demands, which varies over time and place, makes network planning and management challenging. In this work, we propose novel algorithms to solve the joint problem of energy-efficient user association, BH traffic routing and BS/BH link switching on/off. We first formulate an exact model assuming user traffic demand uncertainty leveraging Γ-robustness theory. As the model is intractable for large problem instances, we develop a novel greedy robust heuristic (P-HEUR), which includes a robustifying step to effectively cope with demand uncertainty. Our evaluation demonstrates that P-HEUR provides robust and energy-efficient solutions fast for different scenarios and traffic demand uncertainty levels, significantly outperforming the state-of-the-art, while achieving, even in the most demanding scenarios in terms of traffic load and demand uncertainty, up to 83% of the Optimal, with up to 200k times lower complexity.

Keywords: Beyond 5G (B5G) and 6G networks, millimeter wave (mmWave), switching on/off

Suggested Citation

Mesodiakaki, Agapi and Zola, Enrica and Kassler, Andreas, Robust and Energy-Efficient User Association and Traffic Routing in B5g Hetnets. Available at SSRN: https://ssrn.com/abstract=4055823 or http://dx.doi.org/10.2139/ssrn.4055823

Agapi Mesodiakaki (Contact Author)

affiliation not provided to SSRN ( email )

No Address Available

Enrica Zola

affiliation not provided to SSRN ( email )

No Address Available

Andreas Kassler

Karlstad University ( email )

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