Intra-flow Contention Scheme for Improving QoS in WLAN

2017 ◽  
Vol 7 (8) ◽  
pp. 106
Author(s):  
Simranjeet Kaur ◽  
Maninder Singh
Keyword(s):  
Wireless Networks ◽  
Real Time ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
The Real ◽  
Wired Networks ◽  
Threshold Mechanism ◽  
Wireless Medium

With the increasing popularity of wireless local area network(WLAN),the demand for multimedia services encompassing VoIP, multimedia streaming and interactive gaming is increasing rapidly. The real-time services require stringent Quality of Service (QoS) guarantees for effective communication. While a lot of research has dealt with providing QoS support for real-time services in traditional wired networks, the shared and broadcast nature of the wireless medium necessitates the design of new solutions for wireless networks. In wireless networks, unlike wired networks, the communication from one node will consume  the bandwidth of the neighboring nodes and hence the  shared  bandwidth  can  be easily over-utilized. Therefore, to  provide  an  acceptable  level  of  QoS  for  the  real-time  services, it  is  necessary   to   control  the   utilization   of   the   shared  bandwidth. In this  paper , we  propose  an  efficient admission control scheme named Intra-flow contention scheme with CAC-OLSR routing protocol for WLAN networks which aims at  preserving  the  QoS  for  all  the  admitted  flows  by employing a low overhead  threshold  mechanism.  We  describe several  alternatives for the design of IAC and compare the performance of these alternatives using  simulation  results.

Wi-Fi Technology

2008 ◽  
pp. 711-716
Author(s):  
Antonios Alexiou ◽  
Dimitrios Antonellis ◽  
Christos Bouras
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Physical Constraints ◽  
Wired Networks ◽  
Notebook Computers ◽  
Portable Computing ◽  
The Common ◽  
Multicast Services

Wi-Fi, short for “wireless fidelity,” is a term for certain types of wireless local area network (WLAN) that use specifications in the 802.11 family. In general, the wireless technologies are used for the replacement or the expansion of the common wired networks. They possess all the functionality of wired LANs but without the physical constraints of the wire itself. The wireless nature inherently allows easy implementation of broadcast/multicast services. When used with portable computing devices (e.g., notebook computers), wireless LANs are also known as cordless LANs because this term emphasizes the elimination of both power cord and network cable (Tanenbaum, 2003).

scholarly journals TECHNICAL PRINCIPLES FOR CREATING A WIRELESS LOCAL NETWORK WI-FI

T-Comm ◽  
2021 ◽  
Vol 15 (7) ◽  
pp. 28-33
Author(s):  
Albina Y. Sharifullina ◽  
◽  
Roman R. Galyamov ◽  
Rimma S. Zaripova ◽  
◽  
...  
Keyword(s):  
Wireless Networks ◽  
Wireless Network ◽  
Wireless Lan ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Local Network ◽  
Area Network ◽  
Access Points ◽  
Basic Service

This article discusses the stages of development, characteristics of a wireless local area network Wi-Fi, options for its topology and equipment used. Currently, there are such different types of wireless networks as Wireless Wide Area Network, Wireless Metropolitan Area Networks (Wireless Neighborhood Area Network), Wireless Local Area Network, Wireless Personal Area Network. Each of the listed wireless networks has its own specific range and application. Wireless LAN Wi-Fi refers to the Wireless Local Area Network. The first wireless LAN standard, Wi-Fi, was approved in 1997. From the moment of their appearance to the present day, the following standards of this network have appeared: 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.11ad, 802.11ax. For each standard, the speeds and frequency ranges at which the data transmission was carried out are indicated, and the technologies on which they are built are described. Wireless LAN Wi-Fi has three topologies: 1) Ad-Hoc (point-to-point) or Independent Basic Service Set; 2) Basic Service Set (“client / server”) and 3) Extended Service Set (“extended service areas”). To build a Wi-Fi network, network adapters, access points, routers, ADSL modems, Wi-Fi phones, Wi-Fi antennas, Wi-Fi repeaters are used. Wi-Fi adapters are used by devices that do not have a built-in Wi-Fi module. Wi-Fi access points are designed for organizing wireless access within a local network. Wi-Fi routers are designed to route traffic on a computer network. ADSL modems are used to access the Internet over a telephone line. Wi-Fi repeaters are used to expand the coverage of a wireless network using already installed equipment. Wi-Fi phones are wireless IP phones. Wi-Fi antennas are used to extend the range of a wireless network.

Development of Field Control System of Automated Guided Vehicle Based on Wireless Local Area Network and CAN Bus

2013 ◽  
Vol 579-580 ◽  
pp. 792-797
Author(s):  
Yan Wang ◽  
Zhong Da Yu ◽  
Chen Xing Bao ◽  
Dong Xiang Shao
Keyword(s):  
Control System ◽  
Real Time ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Can Bus ◽  
Control Unit ◽  
Local Area ◽  
Automated Guided Vehicle ◽  
Area Network ◽  
Control Units

In this paper, we realize a real-time communication based on wireless local area network (WIFI) and controller area network (CAN) bus and develop a distributed control system for an automated guided vehicle (AGV). The system consists of two levels: (1) communication between AGVs and main computer based on WIFI, (2) communicationg between control units of AGV based on CAN bus. A real-time operating system μC/OS-II was used to control time, which significantly reduces the time for program and improves development efficiency. Finally, a small-size distributed AGV controller is developed as the main control unit of AGV and a distributed I/O system is developed based on it.

Equipment management in higher education using a WLAN framework

2005 ◽  
Vol 24 (3) ◽  
pp. 209-214
Author(s):  
Shun-Hsing Chen ◽  
Ching-Chow Yang ◽  
Jiun-Yan Shiau
Keyword(s):  
Higher Education ◽  
Real Time ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Data Gathering ◽  
Local Area ◽  
Equipment Management ◽  
Area Network ◽  
Time Service ◽  
Bar Code

This study establishes a comprehensive management information system (MIS) by using not only the real-time characteristics of wireless local area network (WLAN) technology for data reading and writing, but also the convenient data input/output provided by PDA's. This system is then applied in equipment management in higher education organizations, and a centralized center is used to manage the equipment of numerous departments. This wireless equipment management system, which was established to access data instantly, increases system performance in providing real-time service. Furthermore, the integration of bar code facility and real-time equipment management function via web-based technology for managing department equipment solves accuracy problems during the data gathering process. This system increases equipment management efficiency and reduces manpower costs.

scholarly journals WLAN Technologies for Audio Delivery

2007 ◽  
Vol 2007 ◽  
pp. 1-16 ◽  
Author(s):  
Nicolas-Alexander Tatlas ◽  
Andreas Floros ◽  
Thomas Zarouchas ◽  
John Mourjopoulos
Keyword(s):  
Real Time ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Experimental Methodology ◽  
Area Network ◽  
Audio Signals ◽  
Transmission Errors ◽  
Multiple Receivers ◽  
Synchronization Scheme

Audio delivery and reproduction for home or professional applications may greatly benefit from the adoption of digital wireless local area network (WLAN) technologies. The most challenging aspect of such integration relates the synchronized and robust real-time streaming of multiple audio channels to multipoint receivers, for example, wireless active speakers. Here, it is shown that current WLAN solutions are susceptible to transmission errors. A detailed study of the IEEE802.11e protocol (currently under ratification) is also presented and all relevant distortions are assessed via an analytical and experimental methodology. A novel synchronization scheme is also introduced, allowing optimized playback for multiple receivers. The perceptual audio performance is assessed for both stereo and 5-channel applications based on either PCM or compressed audio signals.

scholarly journals A Novel Handoff Necessity Estimation Approach Based on Travelling Distance

2018 ◽  
Vol 7 (2) ◽  
pp. 105
Author(s):  
Jyoti Madaan ◽  
Indu Kashyap
Keyword(s):  
Wireless Networks ◽  
Mobile Communications ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Low Cost ◽  
Heterogeneous Wireless Networks ◽  
Threshold Value ◽  
Local Area ◽  
Considerable Proportion ◽  
Area Network

<p><em>Mobility management is one of the most important challenges in Next Generation Wireless Networks (NGWNs) as it enables users to move across geographic boundaries of wireless networks. Nowadays, mobile communications have heterogeneous wireless networks offering variable coverage and Quality of Service (QoS). The availability of alternatives generates a problem of occurrence of unnecessary handoff that results in wastage of network resources. To avoid this, an efficient algorithm needs to be developed to minimize the unnecessary handoffs. Conventionally, whenever  Wireless Local Area Network (WLAN) connectivity is available, the mobile node switch from cellular network to wireless local area network  to gain maximum use of high bandwidth and low cost of wireless local area network as much as possible. But to maintain call quality and minimum number of call failure, a considerable proportion of these handovers should be determined. Our algorithm makes the handoff to wireless local area network only when the Predicted Received Signal Strength (PRSS) falls below a threshold value and travelling distance inside the wireless local area network is larger than a threshold distance.Through MATLAB simulation, we show that our algorithm is able to improve handover performance.<strong> </strong></em></p>

Wireless Security

2008 ◽  
pp. 409-446
Author(s):  
Manuel Mogollon
Keyword(s):  
Wireless Networks ◽  
Access Control ◽  
Metropolitan Area ◽  
Wireless Lan ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Metropolitan Area Network ◽  
Personal Area Network

The nature of wireless is that of a physically open medium which makes authentication, access control, and confidentiality necessary in the implementation of a wireless LAN. There are three primary categories of networks: wireless local area network (WLAN), wireless metropolitan-area network (WMAN), and wireless personal area network (WPAN). The security for each of these types of wireless networks is discussed in this chapter.

Method for collecting thermocouple data via secured shell over a wireless local area network in real time

2015 ◽  
Vol 86 (3) ◽  
pp. 035112 ◽  
Author(s):  
F. Arnold ◽  
I. DeMallie ◽  
L. Florence ◽  
D. O. Kashinski
Keyword(s):  
Real Time ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network

Link-Level Simulator for Wireless local Area Network

2018 ◽  
Vol 6 (7) ◽  
pp. 314
Author(s):  
Chaithra. H. U ◽  
Vani H.R
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area Networks ◽  
Local Area ◽  
Long Term Evolution ◽  
Wireless Local Area Networks ◽  
Area Network ◽  
Network Simulator ◽  
Term Evolution

Now a days in Wireless Local Area Networks (WLANs) used in different fields because its well-suited simulator and higher flexibility. The concept of WLAN  with  advanced 5th Generation technologies, related to a Internet-of-Thing (IOT). In this project, representing the Network Simulator (NS-2) used linked-level simulators for Wireless Local Area Networks and still utilized IEEE 802.11g/n/ac with advanced IEEE 802.11ah/af technology. Realization of the whole Wireless Local Area Networking linked-level simulators inspired by the recognized Vienna Long Term Evolution- simulators. As a outcome, this is achieved to link together that simulator to detailed performances of Wireless Local Area Networking with Long Term Evolution, operated in the similar RF bands. From the advanced 5th Generation support cellular networking, such explore is main because different coexistences scenario can arise linking wireless communicating system to the ISM and UHF bands.

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