UAV-Assisted C-RAN with Rate Splitting Under Base Station Breakdown Scenarios

Ahmad, Alaa Alameer; Kakar, Jaber; Reifert, Robert-Jeron; Sezgin, Aydin

doi:10.1109/iccw.2019.8757041

Cited by 28 publications

(27 citation statements)

References 13 publications

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“…The RS multiple access is also being studied for other promising technologies. The work in [212] studies the impact of an UAV-assisted cloud radio access network system with RS to overcome possible BS breakdown. The UAVs are used to provide coverage when a BS fails, and RS is added as an alternative interference management mechanism to treat interference as noise.…”

Section: F Impact Of Novel Rate-splitting Interference Management On ...mentioning

confidence: 99%

A Survey on Coverage Enhancement in Cellular Networks: Challenges and Solutions for Future Deployments

Borralho

Mohamed

Quddus

et al. 2021

IEEE Commun. Surv. Tutorials

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Seamless and ubiquitous coverage are key factors for future cellular networks. Despite capacity and data rates being the main topics under discussion when envisioning the Fifth Generation (5G) and beyond of mobile communications, network coverage remains one of the major issues since coverage quality highly impacts the system performance and end-user experience. The increasing number of base stations and user terminals is anticipated to negatively impact the network coverage due to increasing interference. Furthermore, the "ubiquitous coverage" use cases, including rural and isolated areas, present a significant challenge for mobile communication technologies. This survey presents an overview of the concept of coverage, highlighting the ways it is studied, measured, and how it impacts the network performance. Additionally, an overlook of the most important key performance indicators influenced by coverage, which may affect the envisioned use cases with respect to throughput, latency, and massive connectivity, are discussed. Moreover, the main existing developments and deployments which are expected to augment the network coverage, in order to meet the requirements of the emerging systems, are presented as well as implementation challenges.

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Section: F Impact Of Novel Rate-splitting Interference Management On ...mentioning

confidence: 99%

A Survey on Coverage Enhancement in Cellular Networks: Challenges and Solutions for Future Deployments

Borralho

Mohamed

Quddus

et al. 2021

IEEE Commun. Surv. Tutorials

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“…Through simulations, they demonstrated the superiority of RS compared to conventional non-RS approaches for satellite communications. However, in the context of aerial networks, there has been only few reported result on RSMA [109], [110]. In [109], RSMA-based C-RAN is realized using several gBSs and aBSs, whereas, the authors of [110] reported the energy efficiency of an RSMA-based gBS towards aerial users.…”

Section: A Backgroundmentioning

confidence: 99%

“…However, in the context of aerial networks, there has been only few reported result on RSMA [109], [110]. In [109], RSMA-based C-RAN is realized using several gBSs and aBSs, whereas, the authors of [110] reported the energy efficiency of an RSMA-based gBS towards aerial users. Finally, [111], [112] investigated the downlink and uplink SISO RSMA parameters optimization, supporting that their results would serve as a benchmark for the MIMO system.…”

Section: A Backgroundmentioning

confidence: 99%

Multiple Access in Aerial Networks: From Orthogonal and Non-Orthogonal to Rate-Splitting

Jaafar

Naser

Muhaidat

et al. 2020

IEEE Open J. Veh. Technol.

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Recently, interest on the utilization of unmanned aerial vehicles (UAVs) has aroused. Specifically, UAVs can be used in cellular networks as aerial users for delivery, surveillance, rescue search, or as an aerial base station (aBS) for communication with ground users in remote uncovered areas or in dense environments requiring prompt high capacity. Aiming to satisfy the high requirements of wireless aerial networks, several multiple access techniques have been investigated. In particular, space-division multiple access (SDMA) and power-domain non-orthogonal multiple access (NOMA) present promising multiplexing gains for aerial downlink and uplink. Nevertheless, these gains are limited as they depend on the conditions of the environment. Hence, a generalized scheme has been recently proposed, called rate-splitting multiple access (RSMA), which is capable of achieving better spectral efficiency gains compared to SDMA and NOMA. In this paper, we present a comprehensive survey of key multiple access technologies adopted for aerial networks, where aBSs are deployed to serve ground users. Since there have been only sporadic results reported on the use of RSMA in aerial systems, we aim to extend the discussion on this topic by modelling and analyzing the weighted sum-rate performance of a two-user network served by an RSMA-based aBS. Finally, related open issues and future research directions are exposed. Index Terms-Orthogonal multiple access (OMA), non-orthogonal multiple access (NOMA), rate-splitting multiple access (RSMA), unmanned aerial vehicle (UAV), survey. I. INTRODUCTION D UE to the unprecedented growth of mobile data traffic and stringent quality-of-service (QoS) requirements, recent research efforts have focused on several key enabling technologies for 5G networks and beyond [1], such as millimeter waves (mmWave), terahertz (THz) communications, multiple-input multiple-output (MIMO), massive MIMO, multiple access techniques, relaying, cognitive radio, and unmanned aerial networks [2]. In particular, unmanned aerial vehicles (UAVs) have demonstrated great potential in enabling new applications. For instance, UAVs can be used for aerial security inspection, traffic monitoring, smart agriculture, aerial delivery, etc. [3], [4] (and references therein). Furthermore, UAVs can be deployed as aerial base stations (aBSs) to provide wireless access to ground and aerial devices/users, in several scenarios such as temporary events, disasters when a terrestrial cellular network is not fully operational, and congestion due to unpredictable traffic surges, as well as aerial devices/users (e.g., cargo drones) [5], [6].

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“…Extensions of these works have been made to other system models, e.g., downlink coordinated multi-point transmission [8], cloud-radio access network (C-RAN) [9], multi-user multi-antenna wireless information and power transfer (SWIPT) [10], hybrid radar-communication system [11], and multi-beam satellite communications [12]. In [13], downlink RSMA was considered from one ground BS to serve several aerial users only, whereas in [14], a UAVassisted C-RAN system, where RSMA parameters were optimized for joint transmissions from ground and aerial BSs to terrestrial users, was proposed. UAV-BS placement has been previously considered with multiple access, thus the UAV-BS' altitude and its horizontal location can be either separately or jointly optimized.…”

mentioning

confidence: 99%

“…However, the aforementioned works either focused on simple and well-investigated multiple access techniques such as TDMA, FDMA, SDMA, and single-input-single-output (SISO) NOMA, which are not flexible, and are typically designed for specific scenarios (e.g., single-antenna BS, small number of users, etc.) [15]- [18], or ignored UAV-BS placement optimization when using RSMA on the air-to-ground channels [14]. It is obvious that given the recent research interest into RSMA, the latter has not been sufficiently researched in the context of aerial communications, which motivates us to combine the UAV and RSMA technologies to improve wireless data transmissions to ground users.…”

mentioning

confidence: 99%

On the Downlink Performance of RSMA-Based UAV Communications

Jaafar

Naser

Muhaidat

et al. 2020

IEEE Trans. Veh. Technol.

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The use of unmanned aerial vehicles (UAVs) as base stations (BSs) is envisaged as a key enabler for the fifth generation (5G) and beyond-5G networks. Specifically, aerial base stations (UAV-BS) are expected to provide ubiquitous connectivity and high spectral efficiency. To this end, we present in this correspondence an in-depth look into the integration of ratesplitting multiple access (RSMA) with UAV-BSs and downlink transmissions. A non-convex problem of joint UAV placement, RSMA precoding, and rate splitting, aiming to maximize the weighted sum data rate of users is formulated. Due to its complexity, two sub-problems are investigated, namely the UAV placement and RSMA parameters optimization. The resulting solutions are then combined to propose a novel alternating optimization method. Simulation results illustrate the latter's efficiency compared to baseline approaches.

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UAV-Assisted C-RAN with Rate Splitting Under Base Station Breakdown Scenarios

Cited by 28 publications

References 13 publications

A Survey on Coverage Enhancement in Cellular Networks: Challenges and Solutions for Future Deployments

A Survey on Coverage Enhancement in Cellular Networks: Challenges and Solutions for Future Deployments

Multiple Access in Aerial Networks: From Orthogonal and Non-Orthogonal to Rate-Splitting

On the Downlink Performance of RSMA-Based UAV Communications

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