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Publication
Experimental assessment of WiFi coordination strategies using radio environment maps
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Advisor(s)
Abstract(s)
The rapidly increasing popularity of WiFi has
created unprecedented levels of congestion in the unlicensed
frequency bands, especially in densely populated urban areas.
This results mainly because of the uncoordinated operation and
the unmanaged interference between WiFi access points. In this
context, the main objective of this experiment is to assess the
benefit of a coordinated management of radio resources in dense
WiFi networks for both 2.4 GHz and 5 GHz bands, using
Radio Environment Maps (REM). This experiment has used the
w-iLab.t test environment and the portable test-bed provided by
iMINDS for indoor scenarios. It was shown that REMs can detect
the presence of interfering links on the network (co-channel
or adjacent channel interference), and a suitable coordination
strategy can use this information to reconfigure Access Points
(AP) channel assignment and re-establish the client connection.
The coordination strategy almost double the capacity of a WiFi
link under strong co–channel interference, from 6.8 Mbps to
11.8 Mbps, increasing the aggregate throughput of the network
from 58.7 Mbps to 71.5 Mbps. However, this gain comes with
the cost of a relatively high-density network of spectrum sensors,
increasing the cost of deployment. The technique of AP handoff
was tested to balance the load form one AP to another,
although the aggregate throughput is lower after load balancing.
REMs are also capable of detecting coverage holes on the
network, and a suitable Radio Resource Management strategy
use this information to reconfigure the APs transmit power to reestablish
the client connection and increase the throughput of the
overloaded AP, at a cost of diminishing the aggregate throughput
of the network. The insights coming out from this experiment
helped to understand the opportunities and limitations of WiFi
coordination strategies in realistic scenarios.
Description
Keywords
Radio environment map Portable radio testbed Radio resource management WiFi; Interference management Load balancing
Citation
DIONÍSIO, R.P. [et al.] (2017) - Experimental assessment of WiFi coordination strategies using radio environment maps. International Journal on Advances in Telecommunications. ISSN 1942-2601. Vol. 10, no. 3-4. p. 155-156. http://www.iariajournals.org/telecommunications/
Publisher
IARIA