Hybrid-Mode Multiple Access for UAV-BS Assisted Communications with UL-DL Rate Balancing

Zeng, Haiyong, Zhu, Xu ORCID: 0000-0002-7371-4595, Jiang, Yufei, Wei, Zhongxiang and Hao, Yong
(2020) Hybrid-Mode Multiple Access for UAV-BS Assisted Communications with UL-DL Rate Balancing. In: GLOBECOM 2020 - 2020 IEEE Global Communications Conference, 2020-12-7 - 2020-12-11.

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In this paper, we propose an unmanned aerial vehicle (UAV) base station (BS) assisted communication system for a special event (e.g., a football game) with heterogeneous traffic demands by all users and the uplink (UL)-downlink (DL) rate balancing requirement. With respect to UAV's high mobility, we propose a hybrid mode multiple access (HMMA) strategy where both orthogonal multiple access (OMA) and non-orthogonal multiple access (NOMA) techniques are utilized to meet heterogeneous traffic demands. Specifically, NOMA is utilized to achieve high average data rate, and OMA helps to meet the instantaneous rate demands of users. The proposed HMMA strategy has a high degree of freedom and provides superior minimum average rate across all users and a higher user fairness than the previous work with OMA only or NOMA only, where the instantaneous rate demands of users may not always be guaranteed during UAV's flight time due to dynamic channel changes, the inter-user interference and successive interference cancellation (SIC) error propagation. Furthermore, we investigate joint UL-DL optimization for a UAV assisted wireless system. Based on the channel reciprocity of the air-ground channels, an alternative algorithm is proposed to conduct joint UL-DL optimization of bandwidth assignment and UAV trajectory to accommodate heterogeneous rate demands across users and achieve quasi-balanced average rates in UL and DL.

Item Type: Conference or Workshop Item (Unspecified)
Divisions: Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User: Symplectic Admin
Date Deposited: 08 Apr 2021 09:53
Last Modified: 22 Feb 2024 23:32
DOI: 10.1109/GLOBECOM42002.2020.9322546
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3118212