The Role of Delay and Connectivity in Throughput Reduction of Cooperative Decentralized Wireless Networks

Alkhayyat, Ahmed; Gazi, Orhan; Sadkhan, Sattar B.

doi:10.1155/2015/294016

Cited by 27 publications

(14 citation statements)

References 19 publications

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“…In this way, the objective of this section is to describe state-of-the-art approaches that mainly deal with the relay selection procedures. Then, state-of-the-art selection schemes were classified into five categories, according to the criteria used for the relay selection: Link Quality Based [ 7 , 13 , 14 , 16 , 26 , 27 ], Link Quality and Energy Based [ 17 , 28 , 29 , 30 ], Link Quality and Neighborhood Based [ 15 , 21 ], Link Quality and Data Rate Based [ 31 , 32 ] and Random Relay Selection [ 22 ] ( Figure 2 ).…”

Section: Related Workmentioning

confidence: 99%

“…The selection criterion is one of the most relevant aspects when selecting the set of relays nodes. When selecting the cooperator nodes, many studies consider just quality estimators for this purpose, such as Received Signal Strength Indicator (RSSI), Channel State Information (CSI), Signal-to-noise ratio (SNR) or Link Quality Indicator (LQI) [ 7 , 13 , 14 , 15 , 16 , 17 ]. However, the consideration of just this type of quality estimators may generate inaccurate decisions [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

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An Optimized Relay Selection Technique to Improve the Communication Reliability in Wireless Sensor Networks

Laurindo

Moraes

Nassiffe

et al. 2018

Sensors

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Wireless Sensor Networks (WSN) are enabler technologies for the implementation of the Internet of Things (IoT) concept. WSNs provide an adequate infrastructure for the last-link communication with smart objects. Nevertheless, the wireless communication medium being inherently unreliable, there is the need to increase its communication reliability. Techniques based on the use of cooperative communication concepts are one of the ways to achieve this target. Within cooperative communication techniques, nodes selected as relays transmit not only their own data, but also cooperate by retransmitting data from other nodes. A fundamental step to improve the communication reliability of WSNs is related to the use of efficient relay selection techniques. This paper proposes a relay selection technique based on multiple criteria to select the smallest number of relay nodes and, at the same time, to ensure an adequate operation of the network. Additionally, two relay updating schemes are also investigated, defining periodic and adaptive updating policies. The simulation results show that both proposed schemes, named Periodic Relay Selection and Adaptive Relay Selection, significantly improve the communication reliability of the network, when compared to other state-of-the-art relay selection schemes.

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Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Optimized Relay Selection Technique to Improve the Communication Reliability in Wireless Sensor Networks

Laurindo

Moraes

Nassiffe

et al. 2018

Sensors

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“…One of the most suitable layers to deal with IoT healthbased WBSN system challenges is the physical layer. In the physical layer, there are many techniques which can enhance the network performance, such as modulations, channel coding, channel estimation, network coding, and virtual diversity [10,11]. In this paper, we are interested in the latter one (virtual diversity) because it is considered as a plug and play technique.…”

Section: Introductionmentioning

confidence: 99%

WBSN in IoT Health-Based Application: Toward Delay and Energy Consumption Minimization

et al. 2019

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The wireless body sensor network (WBSN) technologies are one of the essential technologies of the Internet of things (IoT) growths of the healthcare paradigm, where every patient is monitored through a group of small-powered and lightweight sensor nodes. Thus, energy consumption is a major issue in WBSN. The major causes of energy wastage in WBSN are collisions and retransmission process. However, the major cause of the collision happened when two sensors are attempting to transmit data at exactly the same time and same frequency, and the major cause of the retransmission process happened when the collision takes place or data does not received properly due to channel fading. In this paper, we proposed a cognitive cooperative communication with two master nodes, namely, as two cognitive master nodes (TCMN), which can eliminate the collision and reduce the retransmission process. First, a complete study of a scheme is investigated in terms of network architecture. Second, a mathematical model of the link and outage probability of the proposed protocol are derived. Third, the end-to-end delay, throughput, and energy consumption are analyzed and investigated. The simulation and numerical results show that the TCMN can do system performance under general conditions with respect to direct transmission mode (DTM) and existing work.

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“…Although CT has some fundamental benefits compared to non-cooperative communication systems, it has undesirable features that affect communication. For example, when data is processed and transmitted using relays, some drawbacks occur, such as reduced BE [6], which increases the delay during communication [7]. In [8], analysis of BE for cooperative networks and the selection of the best relay node were investigated.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Underlay Cooperative Cognitive Networks Bandwidth Efficiency under Interference and Power Constraints

2019

KSII TIIS

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The definition of the bandwidth efficiency (BE) of cognitive cooperative network (CCN) is the ratio between a number of the licensed slot(s) or sub-channel(s) used by the unlicensed users to transmit a single data packet from the unlicensed transmitter to unlicensed destination, and from unlicensed relay(s) to unlicensed destination. This paper analyzes and improves the BE in the underlay CCN with a new reactive relay selection under interference and power constraints. In other words, this paper studies how unlicensed cooperative users use the licensed network slot(s) or sub-channel(s) efficiently. To this end, a reactive relay selection method named as Relay Automatic Repeat Request (RARQ) is proposed and utilized with a CCN under interference and power constraints. It is shown that the BE of CCN is higher than that of cooperative transmission (CT) due to the interference and power constraint. Furthermore, the BE of CCN is affected by the distance of the interference links which are between the unlicensed transmitter to the licensed destination and unlicensed relay to the licensed destination. In addition, the BE for multiple relays selection over a CCN under interference and power constraints is also analyzed and studied, and it is shown that the BE of CCN decreases as the number of relays increases.

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The Role of Delay and Connectivity in Throughput Reduction of Cooperative Decentralized Wireless Networks

Cited by 27 publications

References 19 publications

An Optimized Relay Selection Technique to Improve the Communication Reliability in Wireless Sensor Networks

An Optimized Relay Selection Technique to Improve the Communication Reliability in Wireless Sensor Networks

WBSN in IoT Health-Based Application: Toward Delay and Energy Consumption Minimization

Improvement of Underlay Cooperative Cognitive Networks Bandwidth Efficiency under Interference and Power Constraints

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