Performance Improvement of Drone MIMO Relay Station Using Selection of Drone Placement

Matsumura, Naoki; Nishimori, Kentaro; Taniguchi, Rin-ichiro; Matsumoto, Tsutomu; Hiraguri, Takefumi

doi:10.1109/iwem.2018.8536637

Cited by 3 publications

(1 citation statement)

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“…The method guarantees transmission errors and achieves a transmission rate of 1.5 times even when there is considerable interference from the ground, and it is also expected to improve blind zones because it establishes relays over a wide area. In addition, in [29], the authors improved the communication capacity characteristics of MIMO systems using drone relay stations by introducing a propagation environment control method (PECM) that selects the best arrangement of drones from among multiple drones in a drone relay network. However, neither of these methods discusses how drones move to the relay, and handovers by movement require different and new capabilities.…”

Section: Wireless Integrated-media Commun Lab Nitmentioning

confidence: 99%

Study on Drone Handover Methods Suitable for Multipath Interference Due to Obstacles

Hirata,

Hiraguri,

Kimura

et al. 2024

Drones

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Networks constructed in the sky are known as non-terrestrial networks (NTNs). As an example of an NTN, relay transmission using drones as radio stations enables flexible network construction in the air by performing handovers with ground stations. However, the presence of structures or obstacles in the flight path causes multipath interference; consequently, the propagation environment fluctuates significantly based on the flight. In such a communication environment, it is difficult for a drone to select an optimal ground station for a handover. Moreover, unlike a terrestrial network, the propagation environment of a flying drone is affected by structures and other factors that cause multipaths based on the flight speed and altitude, making the conditions of the propagation environment even more complex. To solve these problems, we propose handover schemes between drones and the ground that consider the multipath interference caused by obstacles. The proposed methods are used to perform handovers based on an optimal threshold of received power considering interference and avoid unnecessary handovers based on the moving speed, which makes the handover seamless. Finally, we develop a simulator that evaluates the cross layer from propagation to upper network protocols in a virtual space, including buildings, evaluate the communication quality of a drone flying in a three-dimensional space, and confirm the effectiveness of the proposed methods as well as the evaluation of the real environment.

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Section: Wireless Integrated-media Commun Lab Nitmentioning

confidence: 99%