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Keywords = square cell coverage layout

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15 pages, 384 KiB  
Article
Research on the Total Channel Capacities Pertaining to Two Coverage Layouts for Three-Dimensional, UAV-Assisted Ad Hoc Networks
by Xiao Yan, Shenglong Zhu, Qian Wang and Hsiao-Chun Wu
Sensors 2023, 23(7), 3504; https://doi.org/10.3390/s23073504 - 27 Mar 2023
Cited by 2 | Viewed by 1588
Abstract
Unmanned aerial vehicles (UAVs) employed as airborne base stations (BSs) are considered the essential components in future sixth-generation wireless networks due to their mobility and line-of-sight communication links. For a UAV-assisted ad hoc network, its total channel capacity is greatly influenced by the [...] Read more.
Unmanned aerial vehicles (UAVs) employed as airborne base stations (BSs) are considered the essential components in future sixth-generation wireless networks due to their mobility and line-of-sight communication links. For a UAV-assisted ad hoc network, its total channel capacity is greatly influenced by the deployment of UAV-BSs and the corresponding coverage layouts, where square and hexagonal cells are partitioned to divide the zones individual UAVs should serve. In this paper, the total channel capacities of these two kinds of coverage layouts are evaluated using our proposed novel computationally efficient channel capacity estimation scheme. The mean distance (MD) between a UAV-BS in the network and its served users as well as the MD from these users to the neighboring UAV-BSs are incorporated into the estimation of the achievable total channel capacity. We can significantly reduce the computational complexity by using a new polygon division strategy. The simulation results demonstrate that the square cell coverage layout can always lead to a superior channel capacity (with an average increase of 7.67% to be precise) to the hexagonal cell coverage layout for UAV-assisted ad hoc networks. Full article
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Figure 1

Figure 1
<p>Two coverage layout scenarios of UAV-assisted ad hoc wireless networks. Each UAV-BS has a fixed serving area such that it can only serve the ground users within its radio coverage. Two typical coverage layouts are the square cell coverage-layout (<b>left</b>) and hexagonal cell coverage layout (<b>right</b>).</p>
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<p>The configurations of the UAV-assisted ad hoc networks using square cell and hexagonal cell coverage layouts.</p>
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<p>Illustration of the typical partitions of a square cell (<b>left</b>) and a hexagonal cell (<b>right</b>) for <math display="inline"><semantics> <mi>η</mi> </semantics></math> = 3.</p>
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<p>The convergence trends of <math display="inline"><semantics> <msubsup> <mover accent="true"> <mi>σ</mi> <mo>¯</mo> </mover> <mrow> <mi>j</mi> </mrow> <mi mathvariant="script">K</mi> </msubsup> </semantics></math> with respect to <math display="inline"><semantics> <mi>η</mi> </semantics></math> for both square and hexagonal cells (zones).</p>
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<p>The convergence of <math display="inline"><semantics> <msub> <mi>R</mi> <mi>j</mi> </msub> </semantics></math> with respect to <math display="inline"><semantics> <mi>η</mi> </semantics></math> for both square and hexagonal cells (zones).</p>
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<p>The total channel capacities with respect to <math display="inline"><semantics> <mi mathvariant="sans-serif">Θ</mi> </semantics></math> for both square and hexagonal cells with the identical cell area <math display="inline"><semantics> <mrow> <mn>2</mn> <mspace width="0.56917pt"/> <msup> <mi mathvariant="sans-serif">Θ</mi> <mn>2</mn> </msup> </mrow> </semantics></math>.</p>
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