Joint Modeling of TDD and Decoupled Uplink/Downlink Access in 5G HetNets With Multiple Small Cells Deployment

Lahad, Bachir; Ibrahim, Marc; Lahoud, Samer; Khawam, Kinda; Martin, Steven

doi:10.1109/tmc.2020.2979447

Cited by 9 publications

(6 citation statements)

References 23 publications

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“…For this reason, the DU-CP access method causes performance degradation in the 4GHN. In this context, an improved cell association scheme was given by many authors in [17][18][19] in which an MS can associate with a different BS or the same BS in UL and DL in an HN. This improved scheme is known as the DL-and-UL-decoupling (DU-DCP) access scheme.…”

Section: Epcmentioning

confidence: 99%

Energy Efficiency and Throughput Optimization in 5G Heterogeneous Networks

et al. 2023

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Device-to-device communication offers a promising technology for the 5G network that aims to enhance the data rate, reduce latency and cost, improve energy efficiency, and provide other desired features. The 5G heterogeneous network (5GHN) with a decoupled association strategy of downlink (DL) and uplink (UL) is a promising solution for the challenges faced in the 4G heterogeneous network (4GHN). The research presented in this paper evaluates the performance of the 4GHN as well as a DL-and-UL-coupled (DU-CP) access scheme in comparison with the 5GHN with a DL-and-UL-decoupled (DU-DCP) access scheme in terms of the energy efficiency and network throughput in four-tier heterogeneous networks. The energy and throughput are optimized for both scenarios, i.e., DU-CP and DU-DCP, and the results are compared. Detailed performance analyses of the DU-CP and DU-DCP access schemes were conducted with the help of comparisons of the results achieved by implementing a genetic algorithm (GA) and particle swarm optimization (PSO). Both of these algorithms are suited for the non-linear problem under investigation in which the search space is large. The simulation results have shown that the DU-DCP access scheme gives a better performance than the DU-CP scheme in a four-tier heterogeneous network in terms of network throughput and energy efficiency. The PSO achieves an energy efficiency of 12 Mbits/joule for the DU-CP and 42 Mbits/joule for the DU-DCP, whereas the GA yields an energy efficiency of 28 Mbits/joule for the DU-CP and 55 Mbits/joule for the DU-DCP. The performance of the proposed method is compared with those of three other schemes. The results show that the DU-DCP scheme using the GA outperforms the compared methods.

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Section: Epcmentioning

confidence: 99%

Energy Efficiency and Throughput Optimization in 5G Heterogeneous Networks

et al. 2023

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“…where E {P U0 } i is given by (19), and P fix is the circuit power consumption and ζ is the power amplifier efficiency. On the other hand, the EE for UL transmission in HetNet without WPT can be obtained as…”

Section: Uplink Coverage Probability Analysismentioning

confidence: 99%

Decoupled UL/DL User Association in Wireless-Powered HetNets With Full-Duplex Small Cells

Haghgoy

Mohammadi

Mobini

et al. 2023

IEEE Trans. Veh. Technol.

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In this paper, we propose two downlink (DL)-uplink (UL) decoupled (DUDe) user association schemes in wirelesspowered full-duplex (FD) heterogeneous networks (HetNets). We consider a two-tire HetNet comprising of half-duplex (HD) massive multi-antenna macrocell base stations (MBSs) and dualantenna FD small cell base stations (SBSs) to support UL and DL transmissions of FD user equipments (UEs). Each FD UE is first associated to one MBSs/SBSs, based on the mean maximum received power (MMP) scheme or maximum received power (MRP) to harvest energy. During the consecutive data transmission phase, UEs choose to receive DL traffic from the same MBSs/SBSs as that associated with during energy harvesting phase, and send UL traffic through the same/another SBS. Leveraging tools from the stochastic geometry, we develop an analytical framework to analyze the average harvested energy and derive expressions for the UL and DL coverage probabilities of the proposed DUDe user association schemes. Our results show that there is an optimal value for the SBS density in the wireless-powered FD HetNets, at which both DL and UL coverage probabilities are maximized. Moreover, by applying MMPA and MRPA scheme, wireless-powered FD HetNets with DUDe achieves up to 138.78% and 83.37% energy efficiency gain over the FD HetNets with DL/UL coupled user association scheme and without wireless power transfer, respectively.

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“…In [174], resource allocation and user association were jointly optimized, and the performance of different Literature Technical Contribution [164] Quantify the network throughput for hybrid-duplex HetNets [165] Providing mathematical framework, based on stochastic geometry, to model TNFD and bidirectional FD cellular networks [166] DL and UL rate coverage probability and area SE analysis for massive multiuser MIMO-enabled HetNets with FD small cells [167] Overview the changes needed in LTE-A mobile systems to enable decoupled user association [168] Study the gains of DL and UL decoupling in terms of UL capacity, DL cell association is based on the DL received power, and the UL is based on the path-loss. [169] Provide an accurate and tractable model to characterize the UL SINR and rate distribution incorporating offloading and fractional power control [170] DL and UL decoupling in multi-antenna BSs setup with tractable expressions for both signal-tointerference ratio coverage probability and rate coverage probability [171] Closed-form expressions for the association probability, the mean interference received at UEs and BSs under weighted path-loss user association [172] Decoupled rate optimal user association scheme and then use it to derive the tight lower bounds on the maximum UL and DL rates of an FD link [173] Characterizes an FD two-tier HetNet with decoupled access, where both tiers operate on different frequency bands (millimeter wave and microwave) [174] Optimizing frequency allocation and power control to improve the communication quality of UEs [175] Analyzing the UL/DL decoupling gains as a function of both the small cell offset factor and the distance between small cells [176] Joint DL/UL decoupled cell-association, subchannel allocation and power control scheme for deviceto-device underlay HetNets [177] Contract-theory based distributed user association approach, considering the challenges raised by asymmetric information (e.g., channel gains and intercell interferences) between UEs and BSs [178] Joint optimization of decoupled multiple association and resource allocation in both UL and DL, with an objective of maximizing the sum-rate of all UEs [179] joint DL/UL beamformer design for maximizing the system sum-rate, where the user's rate is constrained to a prescribed discrete-rate set resource allocation schemes and user association rules were analyzed. In [175], a joint dynamic TDD and decoupled user association access statistical model was proposed based on a geometric probability approach to address UL and DL throughput degradation challenges.…”

Section: Literaturementioning

confidence: 99%

A Comprehensive Survey on Full-Duplex Communication: Current Solutions, Future Trends, and Open Issues

Mohammadi,

Mobini,

Galappaththige

et al. 2023

IEEE Commun. Surv. Tutorials

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Full-duplex (FD) communication is a potential game changer for future wireless networks. It allows for simultaneous transmit and receive operations over the same frequency band, a doubling of the spectral efficiency. FD can also be a catalyst for supercharging other existing/emerging wireless technologies, including cooperative and cognitive communications, cellular networks, multiple-input multiple-output (MIMO), massive MIMO, non-orthogonal multiple access (NOMA), millimeterwave (mmWave) communications, unmanned aerial vehicle (UAV)-aided communication, backscatter communication (Back-Com), and reconfigurable intelligent surfaces (RISs). These integrated technologies can further improve spectral efficiency, enhance security, reduce latency, and boost the energy efficiency of future wireless networks. A comprehensive survey of such integration has thus far been lacking. This paper fills that need. Specifically, we first discuss the fundamentals, highlighting the FD transceiver structure and the self-interference (SI) cancellation techniques. Next, we discuss the coexistence of FD with the above-mentioned wireless technologies. We also provide case studies for some of the integration scenarios mentioned above and future research directions for each case. We further address the potential research directions, open challenges, and applications for future FD-assisted wireless, including cell-free massive MIMO, mmWave communications, UAV, BackCom, and RISs. Finally, potential applications and developments of other miscellaneous technologies, such as mixed radio-frequency/freespace optical, visible light communication, dual-functional radarcommunication, underwater wireless communication, multi-user ultra-reliable low-latency communications, vehicle-to-everything communications, rate splitting multiple access, integrated sensing and communication, and age of information, are also highlighted.

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Joint Modeling of TDD and Decoupled Uplink/Downlink Access in 5G HetNets With Multiple Small Cells Deployment

Cited by 9 publications

References 23 publications

Energy Efficiency and Throughput Optimization in 5G Heterogeneous Networks

Energy Efficiency and Throughput Optimization in 5G Heterogeneous Networks

Decoupled UL/DL User Association in Wireless-Powered HetNets With Full-Duplex Small Cells

A Comprehensive Survey on Full-Duplex Communication: Current Solutions, Future Trends, and Open Issues

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