Improved Buffer-Aided Multi-Hop Relaying with Reduced Outage and Packet Delay in Cognitive Radio Networks

Alvi, Shakeel; Hussain, Riaz; Hasan, Qadeer Ul; Malik, Shahzad A.

doi:10.3390/electronics8080895

Cited by 5 publications

(4 citation statements)

References 28 publications

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“…In all these schemes, relay operates in simplex mode. In [31], the authors argue that by given priority to the only relay-to-destination links, the end-to-end delay may still be high due to packets jumbling up at the source and may even result in packet drop. To overcome the problem of added delay, a virtual model of operation was proposed.…”

Section: Related Workmentioning

confidence: 99%

QoS‐Oriented Optimal Relay Selection in Cognitive Radio Networks

Alvi

Hussain

Shakeel

et al. 2021

Wireless Communications and Mobile Computing

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A cognitive radio network can be employed in any wireless communication systems, including military communications, public safety, emergency networks, aeronautical communications, and wireless-based Internet of Things, to enhance spectral efficiency. The performance of a cognitive radio network (CRN) can be enhanced through the use of cooperative relays with buffers; however, this incurs additional delays which can be reduced by using virtual duplex relaying that requires selection of a suitable relay pair. In a virtual duplex mode, we mimic full-duplex links by using simultaneous two half-duplex links, one transmitting and the other one receiving, in such a way that the overall effect of duplex mode is achieved. The relays are generally selected based on signal-to-interference-plus-noise ratio (SINR). However, other factors such as power consumption and buffer capacity can also have a significant impact on relay selection. In this work, a multiobjective relay selection scheme is proposed that simultaneously takes into account throughput, delay performance, battery power, and buffer status (i.e., both occupied and available) at the relay nodes while maintaining the required SINR. The proposed scheme involves the formulation of four objective functions to, respectively, maximize throughput and buffer space availability while minimizing the delay and battery power consumption. The weighted sum approach is then used to combine these objective functions to form the multiobjective optimization problem and an optimal solution is obtained. The assignments of weights to objectives have been done using the rank sum (RS) method, and several quality-of-service (QoS) profiles have been considered by varying the assignment of weights. The results gathered through simulations demonstrate that the proposed scheme efficiently determines the optimal solution for each application scenario and selects the best relay for the respective QoS profile. The results are further verified by using the genetic algorithm (GA) and particle swarm optimization (PSO) techniques. Both techniques gave identical solutions, thus validating our claim.

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Section: Related Workmentioning

confidence: 99%

QoS‐Oriented Optimal Relay Selection in Cognitive Radio Networks

Alvi

Hussain

Shakeel

et al. 2021

Wireless Communications and Mobile Computing

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“…SUs are permitted to use the licensed bands simultaneously as PUs if the secondary transmitters adjust their broadcast power to meet a PU-imposed interference constraint. In [20,21], the authors improved the performance of the secondary network with vital technology, called cooperative relaying algorithms, due to the capacity to increase the performance gains. In [22], two relaying methods, such as partial relay selection (PRS) and opportunistic relay selection (ORS), have been extensively inspected.…”

Section: Introductionmentioning

confidence: 99%

“…In [32], the authors give a detailed analysis of the performance of a two-way CR EH-TWCR wireless network (EH-TWCR), which is based on decodeand-forward (DF) in the existence of transceiver limitations. In [19,20,24,25,33,34], the authors proposed the performance of multihop CR wireless networks, specifically end-to-end, where PB or RF signals of the primary transmitter can be used from SUs to harvest energy.…”

Section: Introductionmentioning

confidence: 99%

An Optimized Distributed Routing Protocol for Energy Management Systems Based on Wireless Sensor Networks in Intelligent and Smart Structures

Hammad

Mohamed

Abdel-Atty

2022

Int. j. electr. comput. eng. syst. (Online)

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Energy and spectrum efficiency for energy management systems based on wireless sensor networks in intelligent structures and powered by ambient energy harvesting (EH) are the main problems in wireless sensor networks. Herein, we consider relay selection methods. To address this issue, we proposed the optimal multiantenna power beacon opportunistic relay selection (OMPB-ORS) protocol, which uses decoding and forward methods, in which the relay wireless sensor nodes and the second source are energy-restricted and can harvest energy from a power beacon (PB) multiantenna to transmit aggregated information data from source to destination. The proposed protocol based on specific s witching t ime r eceiver a rchitecture e nhances e nd-to-end p erformance f or m aximum h ardware impairments and interference for the transceiver. To evaluate the performance, we compared our proposed protocol with best ORS (B-ORS), conventional ORS (C-ORS), and hybrid partial relay selection (H-PRS) protocols. Using the Rayleigh-fading channel, the simulation is driven based on asymptotic and exact form expressions of throughput (TP) and outage probability (OP). Simulation results show that the OMPB-ORS protocol achieves a higher TP and OP than all compared protocols.

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“…Cognitive radio (CR) [31] was proposed to solve spectrum-scarcity issue as well as inefficient spectrum usage. In this technique, primary users (or licensed users) can share their licensed bands to secondary users (or unlicensed users) [32][33][34]. Underlay spectrum sharing (USS) [35][36][37] is one of the efficient CR techniques, where the primary and secondary users can use the same bands.…”

Section: Introductionmentioning

confidence: 99%

Outage Performance of Power Beacon-Aided Multi-Hop Cooperative Cognitive Radio Protocol Under Constraint of Interference and Hardware Noises

Nam

Duy²,

et al. 2020

Electronics

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In this paper, we evaluate end-to-end outage probability of a multi-hop decode-and-forward relaying protocol in underlay cognitive radio network. In the proposed protocol, named COOP, secondary nodes including source and relays have to harvest radio-frequency energy from multiple secondary power beacons, and adjust their transmit power, follows a pre-determined interference threshold given by multiple primary users. To enhance the outage performance for the secondary network under an joint constraint of the interference threshold, Rayleigh fading channel and hardware noises caused by imperfect transceiver hardware, the secondary relays on the source-destination path cooperate to forward the source data to the destination. Particularly, they attempt to receive the source data from their previous nodes, and forward it to the secondary destination if requested. Moreover, whenever the destination cannot receive the source data successfully, a successful relay that has the shortest distance to the destination is selected for retransmission. Due to usage of the cooperative transmission, the proposed COOP protocol obtains better performance, as compared with the corresponding multi-hop relaying one (denoted DIRECT) which only uses direct transmission at each hop. We evaluate the outage performance of COOP and DIRECT via both simulation and theory. The obtained results present a significant performance enhancement, as comparing COOP with DIRECT.

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Improved Buffer-Aided Multi-Hop Relaying with Reduced Outage and Packet Delay in Cognitive Radio Networks

Cited by 5 publications

References 28 publications

QoS‐Oriented Optimal Relay Selection in Cognitive Radio Networks

QoS‐Oriented Optimal Relay Selection in Cognitive Radio Networks

An Optimized Distributed Routing Protocol for Energy Management Systems Based on Wireless Sensor Networks in Intelligent and Smart Structures

Outage Performance of Power Beacon-Aided Multi-Hop Cooperative Cognitive Radio Protocol Under Constraint of Interference and Hardware Noises

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