Performance Analysis of Group Selection in UAV Networks with Backhaul-Aware Biasing

• Published in: Wireless communications and mobile computing 2021, Vol.2021 (1)
• Main Authors: Wang, Shusheng, Du, Yuanyuan, Zhang, Hongtao
• Format: Article
• Language: English
• Subjects: Bias; Cooperation; Networks; Radio equipment; Reference signals; Unmanned aerial vehicles; Wireless networks
• ISSN: 1530-8669; 1530-8677
• DOI: 10.1155/2021/3929514

The limited wireless backhaul capacity has become the major bottleneck for UAV communications, while in existing researches of UAV networks, the relation between cell selection and backhaul capacity has not been modeled. This paper proposes cell group selection with backhaul-aware biasing for UAV networks and analyzes system performance by deriving the rate outage probability via stochastic geometry, where the user’s maximum data rate is constrained by backhaul capacity. Specifically, cell group selection is no longer distance-based and considered with backhaul capacity bias factor, where UAVs with higher backhaul capacity will have a larger bias factor to match the backhaul variance. In addition, the dynamic UAV group is organized with the N largest bias reference signal receiving power (BRSRP), where users can utilize the diversity gain by adjusting serving UAV dynamically as the channel conditions change. Analytical results show that the outage probability is decreased by 58% when cell group size N=3 and UAV optimal density λu=600/km2 when UAV height h=150 m.