Power Control for Coordinated NOMA Downlink with Cell-Edge Users

Qianyun Guo (1, 2) , Chi Wan Sung (2) , Yi Chen (3) , Chung Shue Chen (4, 5)

1 Nokia Bell Labs [Paris-Saclay]
2 CUHK - City University of Hong Kong [Hong Kong]
3 CUHK - The Chinese University of Hong Kong [Hong Kong]
4 Nokia Bell Labs [Nozay]
5 LINCS - Laboratory of Information, Network and Communication Sciences

Non-orthogonal multiple access (NOMA) is an effective means to improve the spectral efficiency of a wireless communication system. When applied to cellular networks, cell edge users may suffer from low bit rate, or the associated base stations may need to use excessively high power to serve those users. In order to alleviate the problem, this paper considers the integration of NOMA with coordinated transmission techniques. A two-cell system is considered, in which there are two users near their associated base stations and a cell edge user served by both base stations. It is assumed that each user has a data rate requirement , and the system objective is to minimize the total transmit power. With a formal problem formulation, the feasibility of the problem is characterized by using Helly's theorem. When the problem is feasible, we design both centralized and distributed algorithms to solve it. Numerical results show that NOMA can significantly outperform an orthogonal multiple access scheme in terms of power consumption and outage probability. Index Terms: Non-orthogonal multiple access (NOMA), coordinated multipoint (CoMP), power control, power domain multiplexing.

Mots clés: Non-orthogonal multiple access (NOMA); coordinated multipoint (CoMP); power control; power domain multiplexing

Domaines: Réseaux et télécommunications [cs.NI]

Qianyun Guo, Chi Wan Sung, Yi Chen, Chung Shue Chen. Power Control for Coordinated NOMA Downlink with Cell-Edge Users. IEEE Wireless Communications and Networking Conference (WCNC), Apr 2018, Barcelona, Spain. ⟨hal-01706276⟩