scholarly journals Device to Device based Women Safety System

2021 ◽  
Vol 9 (VI) ◽  
pp. 620-625
Author(s):  
Yogesh Singh Bisht
Keyword(s):  
Cellular Networks ◽  
D2d Communication ◽  
Low Latency ◽  
Communication Model ◽  
Large Role ◽  
Safety Device ◽  
Unlicensed Spectrum ◽  
Fully Integrated ◽  
Financial Difficulties ◽  
Device To Device

Device-to-device (D2D) communication, which offers ultra-low latency for user communication, is projected to play a large role in future cellular networks. This new mode could work in either licensed or unlicensed spectrum. It's a fresh take on the classic cellular communication model. Its advantages, however, come with a slew of technological and financial difficulties that must be addressed before it can be fully integrated into the cellular ecosystem. This paper discusses the main characteristics of D2D communication and how we can use this to build Human Safety Device.

scholarly journals A Survey on Relay Selection in Cooperative Device-to-Device (D2D) Communication in 5G Cellular Networks

2017 ◽  
Author(s):  
Shamganth K ◽  
Said Shafi Abdullah Al-Shabibia
Keyword(s):  
Cellular Networks ◽  
Spectral Efficiency ◽  
Relay Selection ◽  
Relay Node ◽  
Cooperative Networks ◽  
Vital Role ◽  
D2d Communication ◽  
Destination Node ◽  
D2d Communications ◽  
Device To Device

Device-to-device (D2D) communications underlayed to a cellular infrastructure has recently been proposed to increase spectrum and energy efficiency. Relay selection plays a vital role in cooperative networks. In D2D communication, if the chosen relay is not the best relay, then the whole communication will not be successful from source node to destination node. Also to choose the optimal relays, if more feedback and time delay exists between the source nodes and relay node then it leads to degradation of spectral efficiency.  A survey on the relay selection techniques used with D2D communications and the challenges and design issues associated with the integration of D2D in 5G cellular network is presented.

scholarly journals Energy Efficiency Maximization of Two-Time-Slot and Three-Time-Slot Two-Way Relay-Assisted Device-to-Device Underlaying Cellular Networks

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3422
Author(s):  
Van-Van Huynh ◽  
Nguyen Tan-Loc ◽  
Ma Quoc-Phu ◽  
Lukas Sevcik ◽  
Hoang-Sy Nguyen ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Cellular Networks ◽  
Time Slot ◽  
Transmission Rate ◽  
Average Energy ◽  
Transmission Probability ◽  
D2d Communication ◽  
Transmission Power ◽  
Device To Device ◽  
Total Average

The continuous development of fifth generation (5G) communication and Internet of Thing (IoT) inevitably necessitates more advanced systems that can satisfy the growing wireless data rate demand of future equipment. Device-to-Device (D2D) communication, whose performance is evaluated in terms of the overall throughput, energy efficiency (EE) and spectral efficiency (SE), is considered a promising solution for the aforementioned problem. Thereby, this paper aims at improving the performance of the D2D communication underlaying cellular networks operating on multiple bands by maximizing the EE in its uplink. Thanks to the stochastic geometry theory, it is possible to derive the closed-form expressions for the successful transmission probability (STP), the total average transmission rate (TATR), and the total average energy efficiency (TAEE) of cellular and D2D users in different time slot setting. Particularly investigated and compared in this study, there are one-hop, direct, D2D communication in two time slots (2TS), and multi-hop, indirect, D2D communication in three time slots (3TS) with an additional D2D user acting as a two-way relay to assist the communication. Moreover, an optimization problem is formulated to calculate the maximum TAEE of D2D users and the optimum transmission power of both the cellular and D2D users. Herein this optimization study, which is proven to be non-convex, the Quality of Service (QoS) is ensured as the STP on every link is considered. The herein approach is referred to as relay-assisted D2D communication which is capable of delivering a notably better QoS and lower transmission power for communication among distant D2D users.

Interference Alignment-Based Resource Sharing for Device-to-Device Communication Underlaying Cellular Networks

2013 ◽  
Vol 411-414 ◽  
pp. 832-839
Author(s):  
Yu Yang ◽  
Zhang Xiao ◽  
Wang Shuai ◽  
Meng Rui ◽  
Chao Wei Wang
Keyword(s):  
Cellular Networks ◽  
Resource Sharing ◽  
Radio Resource Management ◽  
Interference Alignment ◽  
D2d Communication ◽  
Shared Resources ◽  
Time Frequency ◽  
Frequency Domains ◽  
Device To Device

In this paper, we investigate Device-to-Device (D2D) communication underlaying cellular networks to provide spectrally efficient support of local services. Since in underlay mode, D2D communications share resources in the time and frequency domains with cellular system, it will introduce potentially severe interference to the cellular users and accordingly presents a challenge in radio resource management. In order to avoid generating interference to the high-priority users (cellular users) operating on the same time-frequency resources and to optimize the throughput over the shared resources under the transmit power and the quality of service (QoS) constraints, we propose an interference alignment-based resource sharing scheme for D2D communication underlaying cellular networks. The simulation results demonstrate that by using the proposed scheme, D2D communication can effectively improve the total throughput without generating harmful interference to cellular networks.

scholarly journals Device-to-Device Communications Underlaying Cellular Networks: To Use Unlicensed Spectrum or Not?

2019 ◽  
Vol 67 (9) ◽  
pp. 6598-6611 ◽  
Author(s):  
Fanyi Wu ◽  
Hongliang Zhang ◽  
Boya Di ◽  
Jianjun Wu ◽  
Lingyang Song
Keyword(s):  
Cellular Networks ◽  
Unlicensed Spectrum ◽  
Device To Device

scholarly journals D2D Assisted Cellular Networks in Licensed and Unlicensed Spectrum: Matching-Iteration-Based Joint User Access and Resource Allocation

Algorithms ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 80
Author(s):  
Qiuqi Han ◽  
Guangyuan Zheng ◽  
Chen Xu
Keyword(s):  
Resource Allocation ◽  
Cellular Networks ◽  
System Capacity ◽  
System Throughput ◽  
Unlicensed Spectrum ◽  
Resource Allocation Algorithm ◽  
User Access ◽  
Limited Spectrum

Device-to-Device (D2D) communications, which enable direct communication between nearby user devices over the licensed spectrum, have been considered a key technique to improve spectral efficiency and system throughput in cellular networks (CNs). However, the limited spectrum resources cannot be sufficient to support more cellular users (CUs) and D2D users to meet the growth of the traffic data in future wireless networks. Therefore, Long-Term Evolution-Unlicensed (LTE-U) and D2D-Unlicensed (D2D-U) technologies have been proposed to further enhance system capacity by extending the CUs and D2D users on the unlicensed spectrum for communications. In this paper, we consider an LTE network where the CUs and D2D users are allowed to share the unlicensed spectrum with Wi-Fi users. To maximize the sum rate of all users while guaranteeing each user’s quality of service (QoS), we jointly consider user access and resource allocation. To tackle the formulated problem, we propose a matching-iteration-based joint user access and resource allocation algorithm. Simulation results show that the proposed algorithm can significantly improve system throughput compared to the other benchmark algorithms.

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