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Journal of Mobile Multimedia

Editor-in-Chief: Kwang-Cheng Chen, University of South Florida, USA

ISSN: 1550-4646 (Print Version),

ISSN: 1550-4654 (Online Version)
Vol: 14   Issue: 4

Published In:   October 2018

Publication Frequency: Quarterly

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Recent Advances of Heterogenous Radio Access Networks: A Survey

Yaohua Sun1 and Mugen Peng2

1Student Member, IEEE
2Senior Member, IEEE
Key Laboratory of Universal Wireless Communications (Ministry of Education), Beijing University of Posts and Telecommunications, Beijing, China

Abstract: [+]    |    Download File [ 6109KB ]    |   Read Article Online

Abstract: As a promising paradigm to provide high spectral efficiency and energy efficiency, heterogenous radio access networks (HetNets) have attracted a lot of attention from both academia and industry. This paper presents a comprehensive survey of the recent advances in HetNets, including system architecture evolutions, key techniques, and open issues. The system architectures introduced include conventional HetNets, HetNets with cloud computing, and HetNets with fog computing. In addition, a novel performance metric, together with network self-organization and access slicing, is elaborated, which can help realize a cost-efficient HetNet. Moreover, the other state-of-the-art key techniques in HetNets are surveyed, including nonorthogonal multiple access, interference suppression, and channel estimation in the physical layer, the radio resource allocation in the medium access control layer, and clustering in the network layer. Given the extensiveness of the research area, future research opportunities are identified, which are related to access slicing, HetNets driven by deep learning, and so on.

Keywords: HetNets, cost efficiency, signal processing, radio resource allocation, clustering.

Flexible Multi-Numerology Systems for 5G New Radio

Ahmet Yazar1, and Hüseyin Arslan1,2

1Istanbul Medipol University, Istanbul, 34810 Turkey
2University of South Florida, Tampa, FL 33620 USA

Abstract: [+]    |    Download File [ 1430KB ]    |   Read Article Online

Abstract: The physical layer of 5G cellular communications systems is designed to achieve better flexibility in an effort to support diverse services and user requirements. Orthogonal frequency division multiplexing (OFDM) waveform parameters are enriched with flexible multi-numerology structures. This paper gives a short summary for the Third Generation Partnership Project (3GPP) New Radio (NR) standard and then describes the differences of building blocks for Long Term Evolution (LTE) systems and NR from the flexibility perspective. Research opportunities for multi-numerology systems are presented in a structured manner. Finally, inter-numerology interference (INI) and signal-to-interference ratio (SIR) results as a function of multinumerology parameters, guard allocation and user power levels are obtained through computer simulations.

Keywords: 3GPP, 5G, adaptive scheduling, flexibility, multi-numerology, New Radio, OFDM, waveform

Tutorial on UAVs: A Blue Sky View on Wireless Communication

Evgenii Vinogradov, Hazem Sallouha, Sibren De Bast, Mohammad Mahdi Azari and Sofie Pollin

KU Leuven, Department of Electrical Engineering – ESAT, Leuven, Belgium

Abstract: [+]    |    Download File [ 1716KB ]    |   Read Article Online

Abstract: The growing use of Unmanned Aerial Vehicles (UAVs) for various applications requires ubiquitous and reliable connectivity for safe control and data exchange between these devices and ground terminals. Depending on the application, UAV-mounted wireless equipment can either be an aerial user equipment (AUE) that co-exists with the terrestrial users, or it can be a part of wireless infrastructure providing a range of services to the ground users. For instance, AUE can be used for real-time search and rescue and/or video streaming (surveillance, broadcasting) and Aerial Base Station (ABS) can enhance coverage, capacity and energy efficiency of wireless networks. In both cases, UAV-based solutions are scalable, mobile, easy and fast to deploy. However, several technical challenges have to be addressed before such solutions will become widely used. In this work, we present a tutorial on wireless communication with UAVs, taking into account a wide range of potential applications. The main goal of this work is to provide a complete overview of the main scenarios (AUE and ABS), channel and performance models, compare them, and discuss open research points. This work is intended to serve as a tutorial for wireless communication with UAVs, which gives a comprehensive overview of the research done until now and depicts a comprehensive picture to foster new ideas and solutions while avoiding duplication of past work. We start by discussing the open challenges of wireless communication with UAVs. To give answers to the posed questions, we focus on the UAV communication basics, mainly providing the necessary channel modeling background and giving guidelines on how various channel models should be used. Next, theoretical, simulation- and measurement-based approaches, to address the key challenges for AUE usage, are presented. Moreover, in this work, we aim to provide a comprehensive overview on how UAV-mounted equipment can be used as a part of a communication network. Based on the theoretical analysis, we show how various network parameters (for example coverage area, power efficiency, or user localization error of ABSs) can be optimized.

Keywords: UAV, drone, A2G, ABS, AUE, aerial, channel modeling, shadowing.

Analysis and Evaluation of an Energy-Efficient Routing Protocol for WSNs Combining Source Routing and Minimum Cost Forwarding

Fardin Derogarian Miyandoab1, João Canas Ferreira2 and Vítor M. Grade Tavares2

1Instituto de Telecomunicações and DEM, Universidade da Beira Interior, Faculdade de Engenharia, Portugal
2INESC TEC, Faculdade de Engenharia da Universidade do Porto, Portugal

Abstract: [+]    |    Download File [ 1515KB ]    |   Read Article Online

Abstract: Source routing (SR) minimum cost forwarding (MCF) – SRMCF – is a reactive, energy-efficient routing protocol proposed to improve the existent MCF methods utilized in heterogeneous wireless sensor networks (WSN). This paper presents an analytical analysis with experimental support that demonstrates the effectiveness of the proposed protocol. SRMCF stems from SR concepts and MCF methods exploited in ad hoc WSNs, where all unicast communications (between sensor nodes and the base station, or vice versa) use minimum cost paths. The protocol utilized in the present work was updated and now also handles link and node failures. Theoretical analysis and simulations show that the final protocol exhibits better throughput and energy consumption than MCF. Memory requirements for the routing table in the base station are also analyzed. Experimental results in a real scenario were obtained for implementations of both protocols, MCF and SRMCF, deployed in a small network of TelosB motes. Results show that SRMCF presents a 33% higher throughput and 24% less energy consumption than MCF. Extensive simulations for larger networks of MICAz and TelosB motes confirm the theoretical analysis. The impact of using SRMCF with two different MAC protocols, Berkeley-MAC and ContikiMac, is also evaluated by simulation, and the latter setup was also verified experimentally.

Keywords: Wireless sensor networks, Routing protocol, Minimum cost forwarding, Source routing, Energy efficiency.

River Publishers: Journal of Mobile Multimedia