scholarly journals The Integration Of IEEE 802.11 (WLAN) With RFID Systems in ISM (2.45 GHz) Frequency Band Environment Using Framed Slotted ALOHA And IEEE 802.15.4

2021 ◽  
Author(s):  
Haleh Khojasteh
Keyword(s):  
Ieee 802.11 ◽  
Frequency Band ◽  
Ieee 802.15.4 ◽  
Performance Metrics ◽  
Access Point ◽  
Collision Probability ◽  
Time Sharing ◽  
Slotted Aloha ◽  
Framed Slotted Aloha ◽  
Ieee 802.15.4 Standard

In this thesis, we attempt to solve the problem of WLAN/RFID coexistence and integration in frequency band of GHz or ISM band. Our solution to this problem is to allow the WLAN access and RFID access in a time-sharing manner by making the WLAN Access Point aware of the RFID neighbor-network at MAC layer. The time-sharing function is implemented using IEEE 802.11 PCF mechanism. RFID network is implemented using two different standards. The first one is Framed Slotted Aloha standard and the second one is IEEE 802.15.4 standard. We have simulated both models using Artifex simulator and compared their performance using some performance metrics like collision probability and average number of collision in each superframe. It is shown that IEEE 802.15.4 based model outperforms the Framed Slotted Aloha based model.

scholarly journals The Integration Of IEEE 802.11 (WLAN) With RFID Systems in ISM (2.45 GHz) Frequency Band Environment Using Framed Slotted ALOHA And IEEE 802.15.4

2021 ◽  
Author(s):  
Haleh Khojasteh
Keyword(s):  
Ieee 802.11 ◽  
Frequency Band ◽  
Ieee 802.15.4 ◽  
Performance Metrics ◽  
Access Point ◽  
Collision Probability ◽  
Time Sharing ◽  
Slotted Aloha ◽  
Framed Slotted Aloha ◽  
Ieee 802.15.4 Standard

In this thesis, we attempt to solve the problem of WLAN/RFID coexistence and integration in frequency band of GHz or ISM band. Our solution to this problem is to allow the WLAN access and RFID access in a time-sharing manner by making the WLAN Access Point aware of the RFID neighbor-network at MAC layer. The time-sharing function is implemented using IEEE 802.11 PCF mechanism. RFID network is implemented using two different standards. The first one is Framed Slotted Aloha standard and the second one is IEEE 802.15.4 standard. We have simulated both models using Artifex simulator and compared their performance using some performance metrics like collision probability and average number of collision in each superframe. It is shown that IEEE 802.15.4 based model outperforms the Framed Slotted Aloha based model.

scholarly journals Protocol Enhancements And Performance Analysis Of WiFi Networks

2021 ◽  
Author(s):  
M. Zulfiker Ali ◽  
Jelena Misic
Keyword(s):  
Analytical Model ◽  
Performance Metrics ◽  
Mac Protocol ◽  
Multiple Input Multiple Output ◽  
Access Point ◽  
Collision Probability ◽  
Queuing Model ◽  
Wifi Networks ◽  
Extensive Simulation ◽  
Performance Improvements

The 802.11ac version of the popular IEEE 802.11 protocol aims to boost performance by increasing the channel bandwidth and allowing simultaneous transmission to multiple clients in the downlink direction. This dissertation presents an innovative approach of performance evaluation of downlink multi-user multiple input multiple output (DL-MUMIMO) technique for differentiated quality of service (QoS) based traffic categories in IEEE 802.11ac protocol. We propose a novel analytical model based on discrete Markov chain (DMC) and E-limited M/G/1 queuing model to evaluate the performance improvements of multi-user transmission opportunity (MU-TXOP) sharing in DL-MU-MIMO under non-saturated load and non-ideal channel condition. We also evaluate MU-TXOP sharing probabilities among different QoS nodes to assess the performance improvement of different traffic categories. In this dissertation, we propose an Access Point controlled MAC protocol (A-MAC) that enables simultaneous transmissions from multiple stations (STA) in uplink to eliminate under utilization of network resources in uplink transmission due to single user communication. The protocol uses enhanced distributed channel access (EDCA) technique to initiate multi-user transmission and orthogonal frequency division multiple access (OFDMA) method to transmit multiple Ready-To-Send (RTS) messages simultaneously. The proposed protocol also introduces explicit channel sounding technique by using dedicated OFDM subcarrier blocks for each user. We evaluate the performance of the proposed protocol using a noble analytical model and validate the performance metrics by extensive simulation in different traffic conditions. In this dissertation we also propose the increase of carrier sensing threshold (CSTH) of nodes during association with access point (AP) to mitigate collision probability due to hidden nodes during uplink transmission and validate our proposal through extensive simulation. Finally, we propose a noble analytical model to evaluate the performance of restricted access window (RAW) mechanism of IEEE 802.11ah as the MAC layer protocol for internet of things (IoT) network. We evaluate detailed performance metrics of non-QoS IoT network and investigate the feasibility of using RAW mechanism to support differentiated QoS based heterogeneous IoT network

IEEE 802.15.4 Performance with Wi-Fi Interference

2014 ◽  
Vol 526 ◽  
pp. 330-335
Author(s):  
Fu Qiang Wang ◽  
Xiao Ming Wu ◽  
Yong Pang ◽  
Yan Liang ◽  
Yi Fan Hu
Keyword(s):  
Ieee 802.11 ◽  
Frequency Band ◽  
Ieee 802.15.4 ◽  
Real Life ◽  
Energy Detection ◽  
Performance Measure ◽  
The Other ◽  
Ism Band ◽  
Close Frequency ◽  
Coexistence Issues

This The IEEE 802.15.4 devices are proposed to operate in the 2.4 GHz industrial, scientific and medical (ISM) band. The other devices that use IEEE 802.11 b, g and n share the same frequency band. The interference caused by these technologies can degrade the performance of an IEEE 802.15.4 based wireless network. In this paper we study such degrading effects on a network equipped with IEEE 802.15.4 devices that is exposed to interference in turn with IEEE 802.11 b, g and n. The performance measure in this paper is the link Packet Receive Rate (PRR). Measurements are performed with real-life equipment, in order to quantify coexistence issues. We test all 16 channels of IEEE 802.15.4 in 2.4G band and the results show the decrease of PRR when suffering in close frequency with IEEE 802.11. The connection between energy detection and PRR is also exhibited in this paper.

scholarly journals Protocol Enhancements And Performance Analysis Of WiFi Networks

2021 ◽  
Author(s):  
M. Zulfiker Ali ◽  
Jelena Misic
Keyword(s):  
Analytical Model ◽  
Performance Metrics ◽  
Mac Protocol ◽  
Multiple Input Multiple Output ◽  
Access Point ◽  
Collision Probability ◽  
Queuing Model ◽  
Wifi Networks ◽  
Extensive Simulation ◽  
Performance Improvements

The 802.11ac version of the popular IEEE 802.11 protocol aims to boost performance by increasing the channel bandwidth and allowing simultaneous transmission to multiple clients in the downlink direction. This dissertation presents an innovative approach of performance evaluation of downlink multi-user multiple input multiple output (DL-MUMIMO) technique for differentiated quality of service (QoS) based traffic categories in IEEE 802.11ac protocol. We propose a novel analytical model based on discrete Markov chain (DMC) and E-limited M/G/1 queuing model to evaluate the performance improvements of multi-user transmission opportunity (MU-TXOP) sharing in DL-MU-MIMO under non-saturated load and non-ideal channel condition. We also evaluate MU-TXOP sharing probabilities among different QoS nodes to assess the performance improvement of different traffic categories. In this dissertation, we propose an Access Point controlled MAC protocol (A-MAC) that enables simultaneous transmissions from multiple stations (STA) in uplink to eliminate under utilization of network resources in uplink transmission due to single user communication. The protocol uses enhanced distributed channel access (EDCA) technique to initiate multi-user transmission and orthogonal frequency division multiple access (OFDMA) method to transmit multiple Ready-To-Send (RTS) messages simultaneously. The proposed protocol also introduces explicit channel sounding technique by using dedicated OFDM subcarrier blocks for each user. We evaluate the performance of the proposed protocol using a noble analytical model and validate the performance metrics by extensive simulation in different traffic conditions. In this dissertation we also propose the increase of carrier sensing threshold (CSTH) of nodes during association with access point (AP) to mitigate collision probability due to hidden nodes during uplink transmission and validate our proposal through extensive simulation. Finally, we propose a noble analytical model to evaluate the performance of restricted access window (RAW) mechanism of IEEE 802.11ah as the MAC layer protocol for internet of things (IoT) network. We evaluate detailed performance metrics of non-QoS IoT network and investigate the feasibility of using RAW mechanism to support differentiated QoS based heterogeneous IoT network

Performance Analysis of IEEE 802.15.4 Based Wireless Sensor Networks using LAR protocol for CBR and ZIGBEE Traffic Applications

2013 ◽  
Vol 10 (9) ◽  
pp. 1963-1968
Author(s):  
Samundiswary P. ◽  
Surender R
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Performance Analysis ◽  
Ieee 802.15.4 ◽  
Performance Metrics ◽  
Wireless Sensor ◽  
Personal Area Networks ◽  
Wireless Personal Area Networks ◽  
Delay Jitter ◽  
Ieee 802.15.4 Standard

IEEE 802.15.4 standard based wireless sensor networks (WSNs) emerges as the next generation wireless standard for low-rate wireless personal area networks. IEEE 802.15.4 standard offers low power, low data rate and short range networking for wireless battery powered devices. It has also started to demand much attention towards research. The performance of the network can be analysed by using different types of routing protocols. In this paper, the performance analysis of IEEE 802.15.4 based Wireless Sensor Networks is done by using  Location Aided Routing (LAR) protocols for the traffic applications such as Constant Bit Rate (CBR) and Zigbee traffic application. The LAR protocol enables the routing of data between the source and destination by using directional flooding technique. The performance metrics such as throughput, delay, jitter and packets dropped of LAR for  CBR and Zigbee traffic application is evaluated and analysed. The simulation is modelled by using QualNet.

scholarly journals Performance Analysis of MAC Layer Protocols for WSN with Considering the Effects of Hidden Node Problem

2021 ◽  
Author(s):  
Kaeed Ketab Kaeed ◽  
Salah Abdulghani Alabady
Keyword(s):  
Ieee 802.11 ◽  
Delay Time ◽  
Ieee 802.15.4 ◽  
Performance Metrics ◽  
Industrial Applications ◽  
Sensor Nodes ◽  
Average Delay ◽  
Application Range ◽  
Hidden Node ◽  
Node Problem

Abstract Wireless sensor networks (WSNs) are consisting of a large number of sensor nodes that sense, gather, and process-specific data. Its importance is dedicated to its enormous application range. It could be used with industrial applications, agricultural applications, military applications, industrial applications, and a lot of other applications, which make it an open area for study by researchers and students. In this paper, the effects of the hidden node problem are studied on three different MAC protocols using various field distances and various numbers of nodes. This study provides the best number of nodes to be disseminated in a specific field distance depending on the needed performance metrics. Six performance metrics are used in this study, which is Goodput, Throughput, PDR, Residual Energy, Average Delay, and first and last node dead in the network. IEEE 802.11, IEEE 802.15.4, and TDMA protocols are the used protocols in this study. Eight different scenarios were proposed and implemented for this study. NS2 is used to construct the proposed scenarios. Results show that TDMA gives the best energy conservation and high delay time with high PDR, while IEEE 802.11 provides the best throughput and Goodput results and low delay time. A graphical view for the results was made to ease of study and analysis.

scholarly journals Modeling and Analysis of Additional Clear Channel Assessment to Improve Performance of IEEE 802.15.4-based MAC Protocol

2020 ◽  
Vol 3 ◽  
pp. 10-21
Author(s):  
Manjunath G. Asuti ◽  
Prabhugoud I. Basarkod
Keyword(s):  
Ieee 802.15.4 ◽  
Performance Metrics ◽  
Mac Protocol ◽  
Markov Chain Model ◽  
Wireless Channel ◽  
Chain Model ◽  
Clear Channel Assessment ◽  
Ieee 802.15.4 Standard ◽  
The Impact ◽  
Clear Channel

Design of the MAC protocol is crucial in all wireless sensor networks (WSNs) due to its influence on the performance of the transceiver, i.e. the most energy-consuming component of each sensor node. A mechanism known as “carrier sense multiple access with collision avoidance” (CSMA/CA) is used for accessing the wireless channel in the IEEE 802.15.4 standard-based MAC protocol in order to avoid collisions between the network’s communicating nodes. CSMA/CA relies on two clear channel assessments (CCA=2) for checking the status of the channel. In this paper, we develop an additional CCA algorithm for the two scenarios encountered in star topology-enabled WSNs. Next, we investigate the impact of an additional clear channel assessment (CCA=3) on performance in IEEE 802.15.4. We develop a Markov chain model for the proposed methodology, and validate it using Matlab. Simulation results show that there is a significant improvement of performance metrics in the IEEE 802.15.4 standard-based MAC protocol with an additional CCA

scholarly journals Multiparametric Monitoring in Equatorian Tomato Greenhouses (I): Wireless Sensor Network Benchmarking

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2555 ◽  
Author(s):  
Mayra Erazo-Rodas ◽  
Mary Sandoval-Moreno ◽  
Sergio Muñoz-Romero ◽  
Mónica Huerta ◽  
David Rivas-Lalaleo ◽  
...  
Keyword(s):  
Comparative Study ◽  
Precision Agriculture ◽  
Virtual Instrument ◽  
Ieee 802.15.4 ◽  
Access Point ◽  
Climatic Conditions ◽  
Wireless Sensor ◽  
Mesh Topology ◽  
Ieee 802.15.4 Standard ◽  
The Comparative Study

In recent years, attention has been paid to wireless sensor networks (WSNs) applied to precision agriculture. However, few studies have compared the technologies of different communication standards in terms of topology and energy efficiency. This paper presents the design and implementation of the hardware and software of three WSNs with different technologies and topologies of wireless communication for tomato greenhouses in the Andean region of Ecuador, as well as the comparative study of the performance of each of them. Two companion papers describe the study of the dynamics of the energy consumption and of the monitored variables. Three WSNs were deployed, two of them with the IEEE 802.15.4 standard with star and mesh topologies (ZigBee and DigiMesh, respectively), and a third with the IEEE 802.11 standard with access point topology (WiFi). The measured variables were selected after investigation of the climatic conditions required for efficient tomato growth. The measurements for each variable could be displayed in real time using either a laboratory virtual instrument engineering workbench (LabVIEWTM) interface or an Android mobile application. The comparative study of the three networks made evident that the configuration of the DigiMesh network is the most complex for adding new nodes, due to its mesh topology. However, DigiMesh maintains the bit rate and prevents data loss by the location of the nodes as a function of crop height. It has been also shown that the WiFi network has better stability with larger precision in its measurements.

scholarly journals Integration Of RFID With WLAN

2021 ◽  
Author(s):  
Nargis Khan
Keyword(s):  
Radio Frequency Identification ◽  
Physical Space ◽  
Access Point ◽  
Collision Probability ◽  
Rfid Tags ◽  
Time Sharing ◽  
Medium Access ◽  
Integration Problem ◽  
Frequency Identification ◽  
Lower Collision

Radio Frequency Identification (RFID) and Wi-Fi WLANs have achieved widespread applicability in different application domains. However, tag range of RFID systems is very short. Hence, integrating RFID with WLAN networks can contribute to wider application of RFID since Wi-FI nodes have much larger communication range. However, both RFID and WLAN use the same frequency band and incurs interference by [sic] each other for channel utilization. In this thesis, an efficient approach to solve the coexistence and integration problem of RFID and Wi-Fi WLAN is proposed. This solution allows these networks to access the medium in a time sharing manner by making the WLAN Access Point (AP) aware of the RFID neighboring network at the Medium Access Control (MAC) layer. Thus, it is possible to locate and identify the RFID tags in the physical space, with co-located Wi-Fi WLANS. Simulation results show that both networks work together by maintaining the performance such as higher throughput and lower collision probability, as is desired.

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