Publication Type:

Conference Proceedings

Authors:

C.Thorpe; S.Murphy; L.Murphy

Source:

12th ACM International Conference on Modeling,Analysis & Simulation of Wireless & Mobile Systems (2009)

Keywords:

Performance optimization; Algorithm design; Simulation

Abstract:

The existence of hidden and exposed nodes can have a
significantly negative impact on the performance of IEEE802.11
networks. Such nodes can increase the probability of collisions
and limit the spatial reuse on the channel. The value of the
Physical Carrier Sensing Threshold (PCST) is instrumental to the
trade-off between the number of hidden and exposed nodes in a
system.
This paper presents a new adaptive physical carrier sensing
mechanism for wireless networks. The K-APCS algorithm
maximizes the aggregate system throughput by optimizing the
balance between the spatial reuse and the collision rate of a
system. It incorporates 802.11k radio resource measurements and
a frame loss bound on each node to enable the on-line tuning of
the PCST. Simulations were performed on five variants of carrier
sensing mechanisms; results show that K-APCS achieves the
maximum spatial reuse with a throughput gain of 28% and the
minimum collision rate with a decrease of 0.01%.

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