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<p>The vast deployment of UAVs as base stations in 5&#xa0;G and beyond, provides a facile accessibility to the users as an advantage and the flight constraints as deficiencies. In this work, we study a multi-tier cellular network with underlaid D2D communications in which the out-of-service Macrocell base station has been replaced by UAV and some Femtocell Base Stations (FBSs). The outage probabilities of attached users and the operator cost function are investigated considering the interference exacerbation in shared subchannels, different fading channels in Line-of-Sight and Non-Line-of-Sight situation of UAV. Closed-form expressions are achieved for the upper bound of outage probabilities and the operator cost function, considering the intensities of physical distributions of the FBSs and the outage probabilities of co-tier and cross tier interferences. The optimization problem is defined to minimize the cost function which is a non-convex problem over the resource allocation parameters. Thus, it is solved by separation into subproblems and the sub-optimal solution is achieved by proposed iterative algorithm. The represented simulation results verify the theoretical analysis and show that the proposed method outperforms the other approach. Likewise, increasing the density of the D2Ds increases the cost function more than the growth of number of Femtocell users.</p>

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Optimizing the operator’s cost function in UAV-assisted multi-tier cellular networks with underlaid D2D communications, an upper bound approach

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Mehran Pourmohammad Abdollahi,
  • Hosein Azarhava,
  • Javad Musevi Niya,
  • Mahdi Nangir

摘要

The vast deployment of UAVs as base stations in 5 G and beyond, provides a facile accessibility to the users as an advantage and the flight constraints as deficiencies. In this work, we study a multi-tier cellular network with underlaid D2D communications in which the out-of-service Macrocell base station has been replaced by UAV and some Femtocell Base Stations (FBSs). The outage probabilities of attached users and the operator cost function are investigated considering the interference exacerbation in shared subchannels, different fading channels in Line-of-Sight and Non-Line-of-Sight situation of UAV. Closed-form expressions are achieved for the upper bound of outage probabilities and the operator cost function, considering the intensities of physical distributions of the FBSs and the outage probabilities of co-tier and cross tier interferences. The optimization problem is defined to minimize the cost function which is a non-convex problem over the resource allocation parameters. Thus, it is solved by separation into subproblems and the sub-optimal solution is achieved by proposed iterative algorithm. The represented simulation results verify the theoretical analysis and show that the proposed method outperforms the other approach. Likewise, increasing the density of the D2Ds increases the cost function more than the growth of number of Femtocell users.