Saeidi, Mohammad AminTabassum, Hina2026-06-162026-06-162025-10-08M. A. Saeidi and H. Tabassum, "Resource Allocation in Cooperative Mid-Band/THz Networks in the Presence of Mobility," in IEEE Transactions on Wireless Communications, vol. 25, pp. 5046-5062, 2026, doi: 10.1109/TWC.2025.36159161536-12761558-2248https://doi.org/10.1109/twc.2025.3615916https://hdl.handle.net/10315/43787© 2025 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.This paper develops a comprehensive framework to investigate and optimize the downlink performance of cooperative multi-band networks (MBNs) operating on upper mid-band (UMB) and terahertz (THz) frequencies, where base stations (BSs) in each band cooperatively serve users. The framework captures sophisticated features such as near-field channel modeling, fully and partially connected antenna architectures, and users’ mobility. First, we consider joint user association and hybrid beamforming optimization to maximize the system sum-rate, subject to power constraints, maximum cluster size of cooperating BSs, and users’ quality-of-service (QoS) constraints. By leveraging fractional programming FP and majorization-minimization techniques, an iterative algorithm is proposed to solve the non-convex optimization problem. We then consider handover (HO)-aware resource allocation for moving users in a cooperative UMB/THz MBN. Two HO-aware resource allocation methods are proposed. The first method focuses on maximizing the HO-aware system sum-rate subject to HO-aware QoS constraints. Using Jensen’s inequality and properties of logarithmic functions, the non-convex optimization problem is tightly approximated with a convex one and solved. The second method addresses a multi-objective optimization problem to maximize the system sum-rate, while minimizing the total number of HOs. Numerical results demonstrate the efficacy of the proposed algorithms, cooperative UMB/THz MBN over stand-alone THz networks, as well as the critical importance of accurate near-field modeling in extremely large antenna arrays. Moreover, the proposed HO-aware resource allocation methods effectively mitigate the impact of HOs, enhancing performance in the considered system.enMulti-band networksTerahertz communicationsUpper mid-bandCoordinated multi-point transmissionHOaware resource allocationNear field communicationResource managementArray signal processingQuality of serviceOptimizationAntenna arraysBandwidthLoad managementMinimizationHigh frequencyArticle