A real-time medium access control protocol for ad hoc wireless local area networks

Authors:
Rusty O. Baldwin;Nathaniel J. Davis, IV;Scott F. Midkiff
Affiliations:
Center for Wireless Telecommunications, Virginia Polytechnic Institute and State University, Blacksburg, VA;Center for Wireless Telecommunications, Virginia Polytechnic Institute and State University, Blacksburg, VA;Center for Wireless Telecommunications, Virginia Polytechnic Institute and State University, Blacksburg, VA
Venue:
ACM SIGMOBILE Mobile Computing and Communications Review
Year:
1999

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Abstract

We develop and analyze a simple, elegant medium access control (MAC) protocol for use in transmitting real-time data in point to point ad hoc wireless local area networks (WLANs). Our enhancement of IEEE 802.11, real-time MAC (RT-MAC), achieves dramatic reductions in mean delay, missed deadlines, and packet collisions by selectively discarding packets and sharing station state information. For example, in a 50 station network with a normalized offered load of 0.7, mean delay is reduced from more than 14 seconds to less than 45 ms, late packets are reduced from 76% to less than 1%, and packet collisions are reduced from 36% to less than 1%. Regression models are developed from simulation data to describe network behavior in terms of throughput, mean delay, ratio of late packets, and ratio of collisions. Stations using RT-MAC are interoperable with stations using IEEE 802.11.