Enhancing spatial reuse in ad hoc networks by carrier sense adaptation

The optimal choice of the carrier sense threshold for throughput maximization in a Carrier Sense Multiple Access ad hoc network is investigated. We show that the optimal threshold is linearly proportional to a function of the number of nodes and of the network size. When the path loss exponent is 2...

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Bibliographic Details
Main Authors: Rossetto, Francesco, Zorzi, Michele
Format: Conference Proceeding
Language:English
Subjects:
Ad hoc networks
Capacity planning
Collision avoidance
Interference
Multiaccess communication
Physical layer
Protocols
Spread spectrum communication
Throughput
Wireless sensor networks
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Summary:The optimal choice of the carrier sense threshold for throughput maximization in a Carrier Sense Multiple Access ad hoc network is investigated. We show that the optimal threshold is linearly proportional to a function of the number of nodes and of the network size. When the path loss exponent is 2 (free space) the optimal threshold is linearly proportional to the node density. Given this finding, we develop a modification of the IEEE 802.11 protocol that performs a local and fully distributed adaptation of the threshold that yields about a 40% improvement in throughput, and also outperforms state-of-the-art protocols for CS adaptation.
ISSN:2155-7578
2155-7586
DOI:10.1109/MILCOM.2007.4455087