scholarly journals Performance evaluation for outdoor wireless scenarios based on IEEE 802.11b/g in the presence of co-channel interference

2020 ◽  
Vol 9 (1) ◽  
pp. 187-197
Author(s):  
Roman Alcides Lara-Cueva ◽  
Michael Santiago Simba-Herrera
Keyword(s):  
Local Area Networks ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
Voice Over Internet Protocol ◽  
Ieee 802.11B ◽  
Time Service ◽  
Delay Jitter ◽  
Channel Interference ◽  
Optimal Values

Voice over Internet Protocol (VoIP) has evolved over the years, being a real-time service. VoIP has been coupled to different technologies, one of them is WiFi, which is one of the most used for wireless local area networks in domestic and commercial environments. In this paper, we evaluate the performance of wireless scenarios by considering VoIP traffic, based on WiFi technology in conformance with IEEE 802.11b/g in interfered outdoor scenarios, by considering an intrusive injection traffic technique, for codecs G711 (1 sample), G711 (2 samples), G723, G729 (2 samples), and G729 (3 samples), related to the main metrics associated to Quality of Service (QoS) parameters. Our results show the best performance was obtained with the codecs G723 and G729 (3 samples), obtaining up to 30 simultaneous voice connections with optimal values of delay, jitter and packet loss according to the recommendations given for VoIP by ITU-T, while the worst performance was obtained with the codec G711 (2 samples), obtaining only 5 simultaneous voice connections, reaching an efficiency loss of around 18% in a co-channel interference scenario.

Wi-Fi Deployment in Large New Zealand Organizations

2007 ◽  
pp. 24-271
Author(s):  
Bryan Houliston ◽  
Nurul Sarkar
Keyword(s):  
Wireless Networks ◽  
New Zealand ◽  
Case Studies ◽  
Low Cost ◽  
Local Area Networks ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
User Mobility ◽  
Ieee 802.11B

Wi-Fi (also known as IEEE 802.11b) networks are gaining widespread popularity as wireless local area networks (WLANs) due to their simplicity in operation, robustness, low cost, and user mobility offered by the technology. It is a viable technology for wireless local area networking applications in both business and home environments. This chapter reports on a survey of large New Zealand organizations focusing on the level of Wi-Fi deployment, reasons for non-deployment, the scope of deployment, investment in deployment, problems encountered, and future plans. Our findings show that most organizations have at least considered the technology, though a much smaller proportion has deployed it on any significant scale. A follow up review of the latest published case studies and surveys suggests that while Wi-Fi networks are consolidating, interest is growing in wider area wireless networks.

scholarly journals Co-existence performance evaluation of wireless computer networks in a typical office environment

2009 ◽  
Vol 6 (1) ◽  
pp. 169-184 ◽  
Author(s):  
Andreas Miaoudakis ◽  
Dimitrios Stratakis ◽  
Emmanouel Antonidakis ◽  
Vassilios Zaharopoulos ◽  
Radovan Stojanovic
Keyword(s):  
Local Area Networks ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
The Other ◽  
Personal Area Networks ◽  
Wireless Personal Area Networks ◽  
Ieee 802.11B ◽  
Input Devices ◽  
Office Environment ◽  
Ism Band

The Wireless Local Area Networks (WLANs) are often used as a wireless extension to the typical office network infrastructure providing mobility to the users. In addition Wireless Personal Area Networks (WPANs) serve interconnection to computer and mobile phone peripherals as headsets, input devices, printers etc. Thus it is common that WLANs and WPANs have to operate in the same area. IEEE 802.11b/g is the most popular WLAN technology operating in the 2.4GHz Industrial Medical and Scientific (ISM) band. On the other hand Bluetooth (BT) is the technology often used to support WPANs. As BT also uses the 2.4GHz ISM band, there an issue of interference between WLANs and PANs. In this work the performance degradation in Wireless Local Area Networks and Wireless Local Area Networks due to coexistence is examined by real measurements. Both 802.11 to 802.11 and 802.11 to Bluetooth coexistence is addressed.

scholarly journals AP Deployment Research Based on Physical Distance and Channel Isolation

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Dangui Yan ◽  
Chengchang Zhang ◽  
Honghua Liao ◽  
Lisheng Yang ◽  
Ping Li ◽  
...  
Keyword(s):  
Local Area Networks ◽  
Access Point ◽  
Local Area ◽  
Physical Distance ◽  
Mutual Interference ◽  
Optimal Location ◽  
Wireless Local Area Networks ◽  
Position Information ◽  
Penalty Factor

Aiming at the problem of inefficiency of wireless local area networks (WLAN) access point (AP) deployment in urban environment, a new algorithm for AP deployment based on physical distance and channel isolation (DPDCI) is proposed. First, it detects the position information of deployed APs and then calculates the interference penalty factor combined with physical distance and channel isolation, and finally gets the optimal location and channel of the new AP through the genetic algorithm. Comparing with NOOCA algorithm and NOFA-2 algorithm, the results of numerical simulation show that the new algorithm can minimize the mutual interference between basic service sets (BSS), can ensure the maximum of throughput based on quality of service (QoS) in BSS, and can effectively improve the system performance.

scholarly journals Improved Association and Disassociation Scheme for Enhanced WLAN Handover and VHO

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Sungjin Shin ◽  
Donghyuk Han ◽  
Hyoungjun Cho ◽  
Jong-Moon Chung
Keyword(s):  
Mobile Devices ◽  
Local Area Networks ◽  
Access Point ◽  
Local Area ◽  
Vertical Handover ◽  
Base Station ◽  
Wireless Local Area Networks ◽  
Received Signal Strength Indicator ◽  
Wireless Protocol

The number of mobile devices and wireless connections is significantly increasing. Among many wireless protocol types, wireless local area networks (WLANs) are expected to support a significant number of devices. Due to this reason, effective and efficient handover (HO) and vertical handover (VHO) support for WLAN mobile devices is important. A significant improvement in quality of service (QoS) can be obtained by reducing the association and disassociation interruption time for user equipment (UE) servicing real-time applications during WLAN HO and VHO operations. Based on this focus, this paper investigates the problem of using only the received signal strength indicator (RSSI) in HO and VHO decisions, which is what the current IEEE 802.11 based WLAN systems use. Experimental results presented in this paper demonstrate that only using the RSSI results in significant interruption time during HO to another WLAN access point (AP) or to a cellular base station during VHO. Therefore, in this paper, an improved association and disassociation scheme that can reduce the data interruption time (DIT) and improve the throughput performance is proposed.

scholarly journals Experimental Validation of a Coexistence Model of IEEE 802.15.4 and IEEE 802.11b/g Networks

2010 ◽  
Vol 6 (1) ◽  
pp. 581081 ◽  
Author(s):  
Wei Yuan ◽  
Xiangyu Wang ◽  
Jean-Paul M. G. Linnartz ◽  
Ignas G. M. M. Niemegeers
Keyword(s):  
Experimental Validation ◽  
Ieee 802.15.4 ◽  
Local Area Networks ◽  
Real Life ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
Wireless Sensor ◽  
Ieee 802.11B ◽  
Ism Band ◽  
Coexistence Issues

As IEEE 802.15.4 Wireless Sensor Networks (WSNs) and IEEE 802.11b/g Wireless Local Area Networks (WLANs) are often collocated, coexistence issues arise as these networks share the same 2.4 GHz Industrial, Scientific, and Medical (ISM) band. Consequently, their performance may degrade. We have proposed a coexistence model of IEEE 802.15.4 and IEEE 802.11b/g networks, which addresses their coexistence behavior and explains their coexistence performance. As an extension of the previous work, a compact testbed was developed and experiments on the coexistence issues between these networks were conducted. The experiments not only validated the theoretical model but also provided more information and insights about the coexistence issues in the real-life environment.

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