Abstract
To enhance the network coverage and capacity, unmanned aerial vehicle (UAV) communication has become a promising technology thanks to the high mobility and the flexible deployment of UAVs. However, the consistency of the service is not guaranteed due to the limitation single UAV base station (BS), leading to the research for the user-centric UAV swarm networks. This paper derives the semi-closed-form expressions of coverage probability and average achievable rate for the user-centric UAV swarm networks to characterize the performance gain obtained from the increased UAV swarm diversity. Especially, the user-centric UAV swarm networks organize a dynamic UAV swarm for each user consisting of potential serving UAVs in user's vicinity, which gives the design of boundaryless cells to serve each user seamlessly without user's involvement. By modeling the locations of the UAVs as Poisson point process (PPP) and modeling the channel fading as Nakagami-$m$ distribution, the analytical results are calculated under two transmission modes, depending on whether cell coordination is considered or not. The results show that the coverage performance can be improved by 30% without cell coordination and 50% with cell coordination in comparison with traditional cell-centric networks when the UAV altitude is 100 m and SINR threshold is 0 dB.
Highlights
Unmanned aerial vehicle (UAV) communication has became one of the most important candidates in 5G and beyond (B5G) [1], thanks to its high mobility, inexpensiveness and flexibility [2]
NUMERICAL RESULTS Numerical results are conducted and shows how different parameters influence the coverage probability and average achievable rate
When SIR threshold is 0 dB, the coverage probability of user-centric UAV swarm networks without cell coordination achieves an increase of 30% gains over traditional cell-centric UAV networks, and that with cell coordination achieves 60% gain due to the decreased interference
Summary
Unmanned aerial vehicle (UAV) communication has became one of the most important candidates in 5G and beyond (B5G) [1], thanks to its high mobility, inexpensiveness and flexibility [2]. B. CONTRIBUTIONS In this paper, the expressions of coverage probability and average achievable rate are derived in the user-centric UAV swarm networks. This paper considers a user-centric network architecture as defined in [11], where multiple UAVs around the UE form a UAV swarm to serve the specific UE. This network architecture is suitable for the scenarios where the ability of a single UAV is usually blocked or the resource of the VOLUME 7, 2019. In dense urban, since the communication links is more likely to be blocked by the building, user-centric UAV swarm network can provide multiple potential serving UAV and improve the LoS probability. We use m0 and m to represent the Nakagami-m fading parameter of serving link and interference link
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