Cart (Loading....) | Create Account
Close category search window

On the Efficiency of CSMA-CA Scheduling in Wireless Multihop Networks

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Jindal, A. ; Juniper Networks, Inc., San Jose, CA, USA ; Psounis, K.

This paper establishes that random access scheduling schemes, and more specifically CSMA-CA, yield exceptionally good performance in the context of wireless multihop networks. While it is believed that CSMA-CA performs significantly worse than optimal, this belief is usually based on experiments that use rate allocation mechanisms that grossly underutilize the available capacity that random access provides. To establish our thesis, we first compare the achievable rate region of CSMA-CA and optimal in a number of carefully constructed multihop topologies and find that CSMA-CA is always within 48% of the optimal. Motivated by this result, we next characterize the worst-case performance of CSMA-CA in neighborhood topologies representing the congested regions of larger multihop topologies by deriving the neighborhood topology that yields the worst-case throughput ratio for CSMA-CA and find that in neighborhood topologies with less than 20 edges: 1) CSMA-CA is never worse than 16% of the optimal when ignoring physical-layer constraints; and 2) in any realistic topology with geometric constraints due to the physical layer, CSMA-CA is never worse than 30% of the optimal. Considering that maximal scheduling achieves much lower bounds than the above, and greedy maximal scheduling, which is one of the best known distributed approximation of an optimal scheduler, achieves similar worst-case bounds, CSMA-CA is surprisingly efficient.

Published in:

Networking, IEEE/ACM Transactions on  (Volume:21 ,  Issue: 5 )

Date of Publication:

Oct. 2013

Need Help?

IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.