On the Outage Probability and Power Control of D2D Underlaying NOMA UAV-Assisted Networks

Selim, Mahmoud M.; Rihan, Mohamed; Quan, Zhi; Ma, Jinlong

doi:10.1109/access.2019.2894390

Cited by 37 publications

(30 citation statements)

References 28 publications

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“…Sharma and Kim [25] gave a theoretical outage analysis on a UAV-assisted downlink two-user NOMA system. Selim et al [26] considered a UAV-assisted deviceto-device (D2D) communication scenario and derived the link outage probability based on downlink two-user NOMA. Han et al [27] applied downlink NOMA to the UAV with consideration of a imperfect SIC to analyze the link outage probability.…”

Section: B Related Workmentioning

confidence: 99%

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UAV-Enabled Reliable Mobile Relaying Based on Downlink NOMA

Wang

Chen

et al. 2020

IEEE Access

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Unmanned aerial vehicle (UAV) relaying is an efficient solution to provide wireless access for emergency communications due to the high flexibility. The system reliability is usually constrained under limited bandwidth and power resources. Downlink non-orthogonal multiple access (NOMA) can improve the system reliability through a higher resource utilization. To this end, we introduce downlink NOMA to a UAV-enabled mobile relaying system and investigate a scenario where a fixed-wing UAV flies in a circular trajectory to serve as a mobile decode-and-forward (DF) relay in an emergency situation. Since guaranteeing a reliable link is necessary in an emergency situation, our formulated problem is to minimize the maximum outage probability among all links, taking into account the bandwidth and power allocations based on downlink NOMA. Specially, the condition for successful successive interference cancellation (SIC) is also considered. By making change of variables and introducing slack variables, we reformulate our problem into a more tractable form, then we propose an iteration algorithm to solve our problem based on the successive convex optimization (SCO) technique. The optimized bandwidth and power allocation schemes as well as the min-max outage probability along the UAV trajectory are obtained, respectively. Two benchmarks are designed to reveal the performance of our proposed algorithm, and the reliability gain can be obtained by comparing the min-max outage probability and the overall average outage probability. INDEX TERMS UAV, mobile relaying, downlink NOMA, outage probability, resource allocation. I. INTRODUCTION A. BACKGROUND AND MOTIVATION

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Section: B Related Workmentioning

confidence: 99%

“…According to (26), the approximation error between the first-order asymptotic outage probability and the original outage probability is ∞ n=2 c n l n . For a high enough SNR λ r , this approximation error can be ignored due to l → 0.…”

Section: Algorithm Designmentioning

confidence: 99%

UAV-Enabled Reliable Mobile Relaying Based on Downlink NOMA

Wang

Chen

et al. 2020

IEEE Access

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“…In [40], a general framework including cellular mode, D2D mode and hybrid mode has been considered to represented two different mode selections and the corresponding average throughput, dropping probability and average delay have been derived. Regarding D2D underlaying NOMA UAV-aided networks, the authors in [41] have studied the outage performance and power control for UAV connected D2D and cellular users simultaneously.…”

Section: A Related Work 1) Studies On Noma-based Hcdcnsmentioning

confidence: 99%

Performance of D2D Aided Uplink Coordinated Direct and Relay Transmission Using NOMA

Wang

et al. 2019

IEEE Access

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In hybrid device-to-device (D2D) and cellular networks, the cross interference between different communication systems severely limits the system performance. Fortunately, non-orthogonal multiple access (NOMA)-based coordinated direct and relay transmission (CDRT) can fully exploit the inherent property of NOMA to minimize such interference, which provides a potential strategy for hybrid networks to enhance the spectral efficiency (SE) and extend the cell coverage. Based on this idea and the superior SE requirements in future wireless networks, a D2D communication assisted uplink CDRT using NOMA is proposed, in which a base station (BS) directly communicates with a cell-center user (CCU) while communicating with a cell-edge user (CEU) with the aid of a relay. Particularly, uplink transmission of CCU and D2D communication from CCU to CEU are jointly designed according to NOMA principle in the cooperative phase. To verify the system performance of the proposed scheme, closed-form expressions of the system ergodic sum rate (SR), outage performance and outage throughput are derived, respectively. Numerical results illustrate that the proposed scheme achieves superior system ergodic SR as well as outage throughput with slight outage performance loss of uplink transmission, compared with conventional NOMAbased uplink CDRT. INDEX TERMS Ergodic sum rate, spectral efficiency, uplink non-orthogonal multiple access, device-todevice, coordinated direct and relay transmission.

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“…However, all these studies supposed that only two users are multiplexed in power domain. Power allocation methodologies for maximizing throughput in a quasi-static NOMA UAV-BS deployment have been presented in [16]. Although in this work it is assumed that more than two users can be multiplexed in power domain, the joint optimization of UAV altitude and performance dynamics resulting from the choice of user pairing schemes was not discussed.…”

Section: Introductionmentioning

confidence: 99%

“…At this step, once the optimal power level of the user with worst channel condition has been obtained, we can calculate the other coefficients exploiting the relation in (16). In particular, ifK = 2:…”

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confidence: 99%

Energy-Efficient and Throughput Fair Resource Allocation for TS-NOMA UAV-Assisted Communications

Masaracchia

Nguyen

Duong

et al. 2020

IEEE Trans. Commun.

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This paper proposes an optimization framework for power and time resource allocation during time sharing nonorthogonal multiple access (TS-NOMA) transmissions performed by an unmanned aerial vehicle (UAV) in the context of a largescale scenario. The objective of the proposed UAV-TS-NOMA system and optimization framework is to jointly maximize the energy efficiency (EE) and the downlink throughput fairness among users within the UAV communication range. The idea behind is to propose a communication system that: i) merges the advantages of UAV communications with the ones offered by the TS-NOMA paradigm and ii) maximizes the EE and the downlink fairness among users. The resulting model finds applicability in performing energy efficient and throughput fair transmissions into power-constrained communication scenarios. Performance investigations regarding the proposed framework in finding the optimal set of resources which maximizes jointly the above mentioned network metrics, have shown the advantage of the proposed two-step optimization framework in finding the optimal configuration of both power and time resources, respecting both the power constraints at the transmitter and the quality-of-service requirement of the users. In addition, it is shown how under particular conditions the proposed framework jointly optimizes the aforementioned network metrics in only one step.

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On the Outage Probability and Power Control of D2D Underlaying NOMA UAV-Assisted Networks

Cited by 37 publications

References 28 publications

UAV-Enabled Reliable Mobile Relaying Based on Downlink NOMA

UAV-Enabled Reliable Mobile Relaying Based on Downlink NOMA

Performance of D2D Aided Uplink Coordinated Direct and Relay Transmission Using NOMA

Energy-Efficient and Throughput Fair Resource Allocation for TS-NOMA UAV-Assisted Communications

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