scholarly journals On the Goodness of Using Orthogonal Channels in WLAN IEEE 802.11 in Realistic Scenarios

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Jose Manuel Gimenez-Guzman ◽  
Ivan Marsa-Maestre ◽  
David Orden ◽  
Enrique de la Hoz ◽  
Takayuki Ito
Keyword(s):  
Ieee 802.11 ◽  
User Experience ◽  
Frequency Band ◽  
Channel Assignment ◽  
High Density ◽  
Access Points ◽  
Radio Channels ◽  
Heuristic Approaches ◽  
Partial Overlap ◽  
Orthogonal Channels

Due to the high density of Wi-Fi networks, especially in the unlicensed 2.4 GHz frequency band, channel assignment has become a critical duty for achieving a satisfactory user experience. Probably, the main peculiarity of Wi-Fi networks is the partial overlap of the radio channels that can be used by access points. For that reason, a number of works avoid cochannel interferences by using only channels which are far enough from each other to have no interferences, the so-called orthogonal channels. However, there is a range of choices between using the whole spectrum and using only orthogonal channels. In this work we evaluate the influence of the choice of channel set in realistic settings, using both optimization and heuristic approaches. Results show that the optimizer is not able to achieve better results when using the whole spectrum instead of restricting to only the orthogonal channels. In fact, the optimizer uses mainly the orthogonal channels when they are available, while the heuristics considered lose performance when more channels are available. We believe this insight will be useful to design new heuristics for Wi-Fi channel assignment.

scholarly journals A Cluster-Based Channel Assignment Technique in IEEE 802.11 Networks

Telecom ◽  
2020 ◽  
Vol 1 (3) ◽  
pp. 228-241
Author(s):  
Jose Manuel Gimenez-Guzman ◽  
David Crespo-Sen ◽  
Ivan Marsa-Maestre
Keyword(s):  
Ieee 802.11 ◽  
Frequency Band ◽  
Channel Assignment ◽  
Access Points ◽  
Critical Configuration ◽  
802.11 Networks ◽  
Ieee 802.11 Networks ◽  
Heuristic Technique

Channel assignment has become a critical configuration task in Wi-Fi networks due to the increasing number and density of devices which use the same frequency band in the radioelectric spectrum. There have been a number of research efforts that propose how to assign channels to the access points of Wi-Fi networks. However, most of them ignore the effect of clients (also called stations or STAs) in channel assignment, instead focusing only on access points (APs). In this paper, we claim that considering STAs in the channel assignment procedure yields better solutions in comparison with those obtained when STAs are ignored. To evaluate this hypothesis we have proposed a heuristic technique that includes the effect of interferences produced by STAs. Results show that taking STAs into account clearly improves the performance of the solutions both in terms of the achieved utility and in terms of the variability of results. We believe that these results will be useful to the design of future channel assignment techniques which consider the effect of STAs.

scholarly journals Properties of Channel Interference for Wi-Fi Location Fingerprinting

2010 ◽  
Vol 6 (2) ◽  
pp. 56 ◽  
Author(s):  
Eddie C. L. Chan ◽  
George Baciu ◽  
S.C. Mak
Keyword(s):  
Channel Assignment ◽  
Ad Hoc ◽  
Research Work ◽  
Skewed Distribution ◽  
Positioning Accuracy ◽  
Access Points ◽  
Location Fingerprinting ◽  
Channel Interference ◽  
Assignment Scheme ◽  
Localization Systems

Localization systems for indoor areas have recently been suggested that make use of existing wireless local areanetwork (WLAN) infrastructure and location fingerprinting approach. However, most existing research work ignores channel interference between wireless infrastructures and this could affect accurate and precise positioning. A better understanding of the properties of channel interference could assist in improving the positioning accuracy while saving significant amounts of resources in the location-aware infrastructure. This paper investigates to what extent the positioning accuracy is affected by channel interference between access points. Two sets of experiments compare how the positioning accuracy is affected in three different channel assignment schemes: ad-hoc, sequential, and orthogonal data is analyzed to understand what features ofchannel interference affect positioning accuracy. The results show that choosing an appropriate channel assignment scheme could make localization 10% more accurate and reduces the number of access points that are required by 15%. The experimental analysis also indicates that the channel interference usually obeys a right-skewed distribution and positioning accuracy is heavily dependent on channel interference between access points (APs).

A Femtocellular-Cabled Solution for Broadband Wireless Access

2011 ◽  
Vol 3 (2) ◽  
pp. 38-50 ◽  
Author(s):  
Dario Di Zenobio ◽  
Massimo Celidonio ◽  
Lorenzo Pulcini ◽  
Arianna Rufini
Keyword(s):  
Digital Divide ◽  
Frequency Band ◽  
Mobile Networks ◽  
Wireless Access ◽  
Mobile Technologies ◽  
Innovative Approach ◽  
Broadband Wireless Access ◽  
End User ◽  
Broadband Wireless ◽  
Access Points

Broadband Wireless Access is a strategic opportunity for mobile operators which aim to provide connectivity in digital divide areas, in order to accelerate speed of deployment and save in installation costs. This paper presents an innovative approach to access the end user, relying on infrastructural integration of femtocellular technology with existing cabled network. Usually, the adoption of Femtocell Access Points, operating in the licensed cellular bands typically designed to be used in SOHO, improves the radio coverage and the building penetration of the existing mobile networks, based on macrocells. In the proposed solution, the peculiar functionality of femtocells is further improved using a MATV/SMATV cabled infrastructure which facilitates the signal connection inside the building. The potentiality of the solution is even more evident, taking into account the growing interest towards the possible deployment of new mobile technologies, like LTE in both the last portion of the UHF band V and the GSM frequency band, resulting from the re-farming process.

Channel Assignment Algorithm in Centralized WLAN

2014 ◽  
Vol 721 ◽  
pp. 728-731
Author(s):  
Da Wei Dong ◽  
Xiao Guo Liu ◽  
Tian Jing
Keyword(s):  
Channel Assignment ◽  
Wireless Lan ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Dynamic Adjustment ◽  
Access Points ◽  
Received Power ◽  
Assignment Algorithm

To reduce the number of inter-disturb access points and the interference among access points in same channel, with research on interference issus and channel assignment algorithms of wireless local area network, a scheme suitable for centralized wireless local area network was proposed aiming to minimize the total interference among access points, which comprehensively considerate the number of neighbor and the received power. And then the algorithm with cases was simulated and analyzed, the result of NS2 simulation indicated that the algorithm was simple, effective and feasible, which could realize dynamic adjustment to the wireless LAN RF channel and had a better load balance effect among non-overlapping channels.

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