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Resource Optimization With Interference Coupling in Multi-RIS-Assisted Multi-Cell Systems
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.ORCID iD: 0000-0001-7306-8354
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Computing Science.ORCID iD: 0000-0001-8119-5206
2022 (English)In: IEEE OPEN JOURNAL OF VEHICULAR TECHNOLOGY, ISSN 2644-1330, Vol. 3, p. 98-110Article in journal (Refereed) Published
Abstract [en]

Deploying reconfigurable intelligent surface (RIS) to enhance wireless transmission is a promising approach. In this paper, we investigate large-scale multi-RIS-assisted multi-cell systems, where multiple RISs are deployed in each cell. Different from the full-buffer scenario, the mutual interference in our system is not known a priori, and for this reason we apply the load coupling model to analyze this system. The objective is to minimize the total resource consumption subject to user demand requirement by optimizing the reflection coefficients in the cells. The cells are highly coupled and the overall problem is non-convex. To tackle this, we first investigate the single-cell case with given interference, and propose a low-complexity algorithm based on the Majorization-Minimization method to obtain a locally optimal solution. Then, we embed this algorithm into an algorithmic framework for the overall multi-cell problem, and prove its feasibility and convergence to a solution that is at least locally optimal. Simulation results demonstrate the benefit of RIS in time-frequency resource utilization in the multi-cell system.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE) Institute of Electrical and Electronics Engineers (IEEE), 2022. Vol. 3, p. 98-110
Keywords [en]
Interference, Wireless communication, NOMA, Couplings, Time-frequency analysis, Array signal processing, Vehicular and wireless technologies, Load coupling, multi-cell system, reconfigurable intelligent surface (RIS), resource allocation
National Category
Communication Systems Telecommunications
Identifiers
URN: urn:nbn:se:uu:diva-473657DOI: 10.1109/OJVT.2022.3154725ISI: 000782412500001OAI: oai:DiVA.org:uu-473657DiVA, id: diva2:1655498
Funder
Swedish Research Council, 2018-05247Available from: 2022-05-02 Created: 2022-05-02 Last updated: 2025-05-07Bibliographically approved
In thesis
1. Selected Topics on Optimal Allocation and Configuration in Mobile Computing for 5G and Beyond
Open this publication in new window or tab >>Selected Topics on Optimal Allocation and Configuration in Mobile Computing for 5G and Beyond
2025 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This dissertation explores optimal allocation and configuration in mobile computing for 5G and beyond. As wireless technologies rapidly evolve, emerging technologies such as integrated terrestrial, aerial, and satellite networks (ITASNs), integrated sensing and communication (ISAC), reconfigurable intelligent surfaces (RIS), edge computing, AI-driven networking, cell-free multiple-input multiple-output (MIMO), movable antenna systems, and passively cooled base stations (PCBS) are reshaping network design. These innovations promise significant improvements in capacity, energy efficiency, and sustainability, but also introduce challenges in resource allocation and configuration.

The bulk of this dissertation comprises five research papers that address key resource allocation and configuration problems for some of the evolving technologies. Paper I presents a novel framework for jointly optimizing RIS configuration and resource allocation in multi-cell networks. Paper II investigates content caching in edge computing, proposing a column generation-based approach for balancing cost and data freshness. Paper III examines renewable energy management in edge computing networks to minimize the carbon footprint while maintaining performance. Papers IV and V focus on thermal management in PCBS, with Paper IV developing an online reinforcement learning method for dynamic load allocation in a single base station and Paper V extending this approach to multi-cell scenarios with inter-cell interference and resource coupling.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2025. p. 69
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 2550
Keywords
Mathematical Optimization, Resource Allocation and Configuration, Mobile Networks.
National Category
Computer Sciences
Identifiers
urn:nbn:se:uu:diva-555957 (URN)978-91-513-2505-7 (ISBN)
Public defence
2025-08-22, 101121, Sonja Lyttkens, Ångström, Regementsvägen 10, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2025-06-02 Created: 2025-05-07 Last updated: 2025-06-03

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Yu, ZhanweiYuan, Di

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