Daniyal Munir

University of Azad Jammu and Kashmir

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Min Young Chung

Sungkyunkwan University

Syed Tariq Shah

University of Glasgow

Danish Mehmood Mughal

Sungkyunkwan University

Won Jin Lee

Pusan National University

Kae Won Choi

Sungkyunkwan University

Kwang Hyun Park

Sungkyunkwan University

Jaheon Gu

Sungkyunkwan University

Tae‐Jin Lee

Sungkyunkwan University

Syed Faraz Hasan

Massey University

J.S. Kim

Sungkyunkwan University

Cooperative Institutions

Sungkyunkwan University

University of Engineering and Technology Lahore

University of Glasgow

Seoul National University

Electronics and Telecommunications Research Institute

Korea Advanced Institute of Science and Technology

Samsung (South Korea)

Korea University

Seoul National University Hospital

Inha University

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Selection of UE relay considering QoS class for public safety services in LTE-A network

Daniyal Munir Jaheon Gu Min Young Chung

Introduction of Device-to-Device (D2D) communication in public safety (PS) environments has been well investigated by 3rd Generation Partnership Project (3GPP). The main target is to provide communication services to user equipments (UE) in the disaster struck area with the help of ordinary UEs over D2D links. UE-relaying is one of the most important application of D2D communication especially in PS environment. While selecting this type of relay, several factors have to be considered prior to the selection process. Previously, only transmission rates were considered for the selection of UE relay on the basis of received signal strength. We propose a UE relay selection scheme in this article taking into account the quality of service (QoS) class. For that, we consider two important factors which greatly affect the communication process specially in cellular networks; data rates and radial velocity. We use weighted sum model as a tool for selecting most appropriate UE relay. The efficiency of the relay selection process is also increased and we evaluate the performance with the help of system level simulations.

10.1109/apcc.2014.7092845

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Citations (10)

Optimum Percentage of Fly Ash as Cement Replacement and Effect on Mechanical and Durability Properties of Self-Compacting Concrete

Key engineering materials (2022)

Asif Hameed Ali Murtaza Rasool Muhammad Hassan Javed Abrar Afzal Khizar Elahi

Self-compacting concrete (SCC) is a type of concrete that does not require vibration and undergoes compaction under its own self-weight. Cement being the major constituent of self-compacting concrete is very expensive. Thereby incorporating fly ash, a by-product obtained by burning coal in coal power plants, the percentage of cement can be reduced. Thus in this study, class C fly ash in varying percentages from 0 to 30% has been used as a partial replacement of cement. The main purpose is to study the effects of fly ash on mechanical behavior and durability properties of self-compacting concrete and to choose the optimum dosage of fly ash. To determine the mechanical behavior, fresh properties of self-compacting concrete were studied by performing Slump flow, J-ring, V-funnel, and L-box tests. Hardened properties were evaluated by performing the Compressive strength and Split tensile test. The durability was determined using the volume of voids and sorptivity test. Tests to study mechanical behavior were performed by casting cylinder, whereas, concrete discs were cast to perform durability tests. Finally, it was observed that the replacement of 25% Fly ash with cement was found to be the optimum percentage.

Sorptivity

Concrete slump test

10.4028/p-hcknd7

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Duty Cycle Optimizing for WiFi-based IoT Networks with Energy Harvesting

Daniyal Munir Syed Tariq Shah Danish Mehmood Mughal Kwang Hyun Park Min Young Chung

In this paper, we propose a simple method to optimize the duty-cycle of an IoT network equipped with energy harvesters. The main objective is to achieve Energy Neutral Operation (ENO) so that the devices can operate autonomously for longer periods. We use an exponentially weighted moving-average (EWMA) filter to predict the energy harvested in a single duty-cycle, and adjust the duty-cycle according to the energy required during the active periods. As a case study, we consider the use of the carrier sensing medium access (CSMA) Medium Access Control (MAC) protocol in a data collection application where a WiFi access point investigates a group of IoT devices equipped with energy harvesting circuit. We evaluate the performance of the proposed scheme with the help of simulations. The results show that an optimal configuration of the prediction filter can help to reach the ENO condition and ensure the unlimited lifetime of the network.

Duty cycle

Retransmission

10.1145/3164541.3164571

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Low-power backscatter relay network

Daniyal Munir Syed Tariq Shah Won Jin Lee Min Young Chung

This paper proposes a full duplex relay scheme for ambient backscatter devices which require little or no power for operation. The ambient backscatter devices reflect radio signals from ambient sources such as TV tower, FM radio station, etc. Because of the backscattering of radio signals, such devices have small coverage range. To extend the network coverage of such devices, relaying is the most conventional way, which is previously used for extending the coverage range of radio networks such as LTE, WiFi and so on. In this paper, the backscatter devices assist other backscatter devices to relay the information to their destination nodes. Because of the full duplex characteristics at the relaying node, they can send their own information while receiving signals from the source node. We propose the relaying procedure for full duplex backscatter nodes and investigate the its performance in terms of throughput by performing simulations.

Backscatter (email)

10.1145/3022227.3022278

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Information Processing and Wireless Energy Harvesting in Two-Way Amplify-and-Forward Relay Networks

Syed Tariq Shah Daniyal Munir Min Young Chung Kae Won Choi

Wireless energy harvesting is an efficient way to prolong the lifetime of energy constrained networks. In this paper, a two-way amplify-and-forward (AF) based relay network is considered, where two communicating nodes concurrently transmit there information signals to a relay node using time switching based relaying protocol (TSR). The relay node is energy constrained and therefore it first harvests the energy from the received radio frequency (RF) signals. After successful energy harvesting the relay utilizes the harvested energy to amplify and forward the received information signal to its destination. We derive the analytical expression for outage probability and achievable throughput at the receiving nodes. Our numerical results verify our analytical derivation and shows the effect of different system parameters on achievable throughput at receiving nodes.

10.1109/vtcspring.2016.7504290

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Citations (25)

Selection of relay UE with energy harvesting capabilities in public safety environment

2022 International Conference on Information Networking (ICOIN) (2016)

Daniyal Munir Syed Tariq Shah Won Jin Lee Min Young Chung Syed Faraz Hasan

Relaying is a widely proposed solution for multi-hop communication in PS environments. However, the selected relay is energy constrained and cannot go on indefinitely. Energy harvesting can solve this problem and make multi-hop D2D communication a viable solution for PS services. In this paper, selection of energy harvesting relay has been studied for device-to-device (D2D) communications. Public safety environment has been considered, where some user equipments (UE) are located out of the coverage area of eNodeB (eNB). For out of the coverage UEs, communication with the eNB is possible through an intermediate relay UE and selection of those intermediate relay UEs is the main focus of this work. Based on D2D link between potential relay UE and out of coverage UEs and estimated harvested energy at potential relay UE, a relay UE is selected to support out of coverage UEs. The relay-based approach enables D2D communications to incorporate cellular and ad hoc operations based on the network availability. The energy harvesting parameter at the relay UE make it unique, which is used to extend the life of rapidly drained battery of a relay UE. The effect of energy harvesting and D2D link quality on the selection of a relay UE has been topics of focus in this work. The proposed scheme is evaluated through system level simulations.

EnodeB

LTE Advanced

10.1109/icoin.2016.7427085

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Citations (13)

Energy Harvesting for Relay UEs in Public Safety Environment

한국통신학회 학술대회논문집 (2016)

Daniyal Munir Syed Tariq Shah Won Jin Lee Min Young Chung

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Throughput analysis of multi-antenna based SWIPT relay network

2022 International Conference on Information Networking (ICOIN) (2018)

Danish Mehmood Mughal Syed Tariq Shah Daniyal Munir Kwang Hyun Park Min Young Chung

Radio frequency (RF) energy harvesting is a promising solution to increase the lifetime of energy-constrained wireless sensor networks. In this paper, we studied the performance of simultaneous wireless information and power transfer (SWIPT) based multi-antenna decode and forward relay network where relay and destination can have multiple antennas. Energy constraint relay, first harvest energy from the source signal and uses harvested energy to forward the information to the destination, employing time switching (TS) receiver architecture. Deploying multiple antennas on relay and destination, we investigated its benefits using maximum ratio combining (MRC) and maximal ratio transmit (MRT) techniques in delay tolerant and delay limited transmission modes. We have analyzed our system numerically, in terms of throughput and outage. Through simulation results, we have provided key insights on possible benefits of using multiple antennas including throughput, outage, and harvested power.

Transmitter power output

10.1109/icoin.2018.8343136

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Citations (1)

Integrating RF-powered backscatter with underlay cognitive radio networks

2022 International Conference on Information Networking (ICOIN) (2017)

Kwang Hyun Park Daniyal Munir Jun Suk Kim Min Young Chung

This paper proposes the technique which can improve the data rate of secondary system in radio frequency (RF) powered backscatter cognitive radio networks (CRNs). In previous studies, secondary system cannot transmit data by conventional radio transmission when a channel is busy. However, in our proposed scheme, secondary transmitter (ST) is allowed to transmit data even though the channel is busy. The ST selects the harvest-then-transmit or backscatter mode based on interference at primary receiver (PR). We obtain the maximum data rate of secondary system by optimizing the allocated time of energy harvesting, transmitting and backscattering. We evaluate the performance of proposed scheme through the simulation. The results show the proposed scheme improves the performance of the secondary system in terms of throughput.

Backscatter (email)

Transmitter power output

10.1109/icoin.2017.7899521

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Citations (4)

A Mechanism on Energy Harvesting and Data Communications in Wi-Fi Network

Won Jin Lee Syed Tariq Shah Daniyal Munir Tae‐Jin Lee Min Young Chung

RF energy harvesting is a novel technology which is used for harvesting energy from the ambient RF resources. In energy harvesting, harvested energy is converted into useful electrical energy to recharge battery of electronic devices. With energy harvesting scheme, there is no need to replace battery, and the device can be recharged without cable line. Although the energy harvesting technique brings the convenience for recharging the devices, the amount of harvested energy is too small to operate device without supplying energy from the wired resource. In this paper, we consider Wi-Fi signals as energy harvesting resource, where Wi-Fi nodes can harvest energy from ambient signals that are being transmitted by the other users. Not only energy harvesting but also data transmission is considered in this paper. In order to achieve simultaneous wireless information and power transfer (SWIPT) switching circuit is proposed. We measure the received signal strength of Wi-Fi signals in the real environment, and our simulation results show harvested energy and throughput of the nodes in Wi-Fi network.

10.1145/2857546.2857604

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Citations (2)