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More than Just Lines on a Map: Best Practices for U.S Bike Routes
Group based medium access control for ieee 802.11n wireless la ns
1. GROUP-BASED MEDIUM ACCESS CONTROL FOR IEEE 802.11N WIRELESS LANS
ABSTRACT:
The latest generation of Wireless Local Area Networks (WLANs) is based on IEEE 802.11n-
2009 Standard. The standard provides very high data rates at the physical layer and aims to
achieve a throughput at the Medium Access Control (MAC) layer that is higher than 100 Mbps.
To do that, the standard introduces several mechanisms to improve the MAC efficiency. The
most notable ones are the use of frame aggregation and Block-ACK frames. The standard,
however, does not introduce a mechanism to reduce the probability of collision. This issue is
significant because, with a high data rate, an AP would be able to serve a large number of
stations, which would result in a high collision rate.
In this paper, we propose a Group-based MAC (GMAC) scheme that reduces the probability of
collision and also uses frame aggregation to improve the efficiency. The contending stations are
divided into groups. Each group has one station that is the group leader. Only the leader stations
contend, hence, reducing the probability of a collision. We evaluate the performance of our
scheme with analytic and simulation results. The results show that GMAC achieves a high
throughput, high fairness, low delay and maintains a high performance with high data rates.
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