Joint User Association and Resource Allocation in the Uplink of Heterogeneous Networks

Soroush Akhlaghi | Ata Khalili | Hina Tabassum | Derrick Wing Kwan Ng

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=158493
Date :  2020/01/31
Publish in :    IEEE Wireless Communications Letters
DOI :  https://doi.org/10.1109/LWC.2020.2970696
Link :  http://dx.doi.org/10.1109/LWC.2020.2970696
Keywords :user association, resource allocation, Heterogeneous network

Abstract :

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This letter considers the problem of joint user association (UA), carrier allocation, antenna selection (AS), and power control in the uplink (UL) of a heterogeneous network such that the data rate of small cell users can be maximized while the macro-cell users are protected by imposing a threshold on the cross-tier interference. The considered problem is a non-convex mixed integer non-linear programming (MINLP). To tackle the problem, we decompose the original problem into two sub-problems: (i) joint UA, carrier allocation, and AS, and (ii) power control. Then, we iteratively solve the sub-problems by applying the tools from majorization-minimization (MM) theory and augmented Lagrange method, respectively, and obtain locally optimal solutions for each sub-problem. Simulation results illustrate that our proposed scheme outperforms existing schemes. Complexity analysis of the proposed algorithm is also presented.