On the Performance of a Multi-Tier NOMA Strategy in Coordinated Multi-Point Networks

Tian, Yue; Nix, Andrew R; Beach, Mark A

doi:10.1109/lcomm.2017.2725258

Cited by 17 publications

(19 citation statements)

References 9 publications

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“…The authors in [17] also study a CoMP-NOMA system for downlink transmission and propose a suboptimal scheduling strategy for NOMA users under CoMP transmission. In [18], a downlink CoMP-NOMA system is utilized for the purpose of relaying a signal to a remote user who is unable to receive direct transmission from any coordinating cell. The authors derive the outage probability for their proposed CoMP-NOMA system by considering a fixed power allocation strategy.…”

Section: A Preliminariesmentioning

confidence: 99%

Downlink Power Allocation for CoMP-NOMA in Multi-Cell Networks

Ali

Hossain

Al-Dweik

et al. 2018

IEEE Trans. Commun.

178

115

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This work considers the problem of dynamic power allocation in the downlink of multi-cell networks, where each cell utilizes non-orthogonal multiple access (NOMA)-based resource allocation. Also, coordinated multi-point (CoMP) transmission is utilized among multiple cells to serve users experiencing severe inter-cell interference (ICI).More specifically, we consider a two-tier heterogeneous network (HetNet) consisting of a high-power macro cell underlaid with multiple low-power small cells each of which uses the same resource block. Under this CoMP-NOMA framework, CoMP transmission is applied to a user experiencing high channel gain with multiple base stations (BSs)/cells, while NOMA is utilized to schedule CoMP and non-CoMP users over the same transmission resources, i.e., time, spectrum and space. Different CoMP-NOMA models are discussed, but focus is primarily on the joint transmission CoMP-NOMA (JT-CoMP-NOMA) model. For the JT-CoMP-NOMA model, an optimal joint power allocation problem is formulated and the solution is derived for each CoMP-set consisting of multiple cooperating BSs (i.e., CoMP BSs). To overcome the substantial computational complexity of the joint power optimization approach, we propose a distributed power optimization problem at each cooperating BS whose optimal solution is independent of the solution of other coordinating BSs. The validity of the distributed solution for the joint power optimization problem is provided and numerical performance evaluation is carried out for the proposed CoMP-NOMA models including JT-CoMP-NOMA and coordinated scheduling CoMP-NOMA (CS-CoMP-NOMA). The obtained results reveal significant gains in spectral and energy efficiency in comparison with conventional CoMPorthogonal multiple access (CoMP-OMA) systems. Index TermsNon-orthogonal multiple access (NOMA), coordinated multi-point (CoMP) transmission, multi-cell downlink transission, heterogeneous networks (HetNets), dynamic power allocation, spectral efficiency, energy efficiency.

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Section: A Preliminariesmentioning

confidence: 99%

Downlink Power Allocation for CoMP-NOMA in Multi-Cell Networks

Ali

Hossain

Al-Dweik

et al. 2018

IEEE Trans. Commun.

178

115

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“…The work in [10] evaluated the system-level performance of CO-NOMA system in which all users are served in a coordinated way with a suboptimal power allocation solution of FTPA. Besides, a multi-tier NOMA strategy was considered in [11].…”

Section: Introductionmentioning

confidence: 99%

“…Different from [9]- [11], which focus on the sum rate performance, in this paper, we concern more about power consumption of a CO-NOMA system. The coordinated transmission of two BSs is adopted to improve the performance of a cell-edge user.…”

Section: Introductionmentioning

confidence: 99%

Power control for coordinated NOMA downlink with cell-edge users

Guo

Sung

Chen

et al. 2018

2018 IEEE Wireless Communications and Networking Conference (WCNC)

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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.

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“…Recently, studies showed that, by introducing NOMA in coordinated multipoint (CoMP, i.e., a key enhancement for LTE-Advance) networks, not only can the resource efficiency of the whole network be further enhanced [7], but also the complexity of NOMA can be reduced by using proper user-scheduling strategy [8]. Apart from [7,8], there are several research contributions in the context of improving the cooperative networks performance by using NOMA [9][10][11]. In [9], the researchers investigated the outage performance of the relay-aided NOMA downlink and compared it to the conventional OMA strategy.…”

Section: Introductionmentioning

confidence: 99%

“…In [9], the researchers investigated the outage performance of the relay-aided NOMA downlink and compared it to the conventional OMA strategy. In [10], Tian et al conceived a user-relay-based multitier NOMA strategy, which aimed to improve the coverage of CoMP network. Reference [11] investigated the performance of multicell MIMO-NOMA networks, applying coordinated beamforming for dealing with the intercell interference in order to enhance the celledge users' throughput.…”

Section: Introductionmentioning

confidence: 99%

On the Performance of Security-Based Nonorthogonal Multiple Access in Coordinated Multipoint Networks

Tian

Wang

2018

Wireless Communications and Mobile Computing

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The conventional nonorthogonal multiple access (NOMA) strategy has secrecy challenge in coordinated multipoint (CoMP) networks. Under the secrecy considerations, this paper focuses on the security-based NOMA system, which aims to improve the physical layer security issues of conventional NOMA in the coordinated multipoint (NOMA-CoMP) networks. The secrecy performance of S-NOMA in CoMP, that is, the secrecy sum-rate and the secrecy outage probability, is analysed. In contrast to the conventional NOMA (C-NOMA), the results show that the proposed S-NOMA outperforms C-NOMA in terms of the secrecy outage probability and security-based effective sum-rate.

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On the Performance of a Multi-Tier NOMA Strategy in Coordinated Multi-Point Networks

Cited by 17 publications

References 9 publications

Downlink Power Allocation for CoMP-NOMA in Multi-Cell Networks

Downlink Power Allocation for CoMP-NOMA in Multi-Cell Networks

Power control for coordinated NOMA downlink with cell-edge users

On the Performance of Security-Based Nonorthogonal Multiple Access in Coordinated Multipoint Networks

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