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Issue No. 02 - Feb. (2013 vol. 12)
ISSN: 1536-1233
pp: 304-317
Z. Abichar , Dept. of Electr. Eng. & Comput. Sci., Univ. of Central Florida, Orlando, FL, USA
J. M. Chang , Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA
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.
wireless LAN, access protocols, group theory, IEEE standards, probability, GMAC scheme, wireless LAN, group-based medium access control, wireless local area network, IEEE 802.11n-2009 standard, physical layer, frame aggregation, block-ACK frame, probability of collision, IEEE 802.11n Standard, Throughput, Wireless LAN, Schedules, Lead, Mobile computing, Media Access Protocol, IEEE 802.11n standard, Computer networks, wireless LAN, medium access control

J. M. Chang and Z. Abichar, "Group-Based Medium Access Control for IEEE 802.11n Wireless LANs," in IEEE Transactions on Mobile Computing, vol. 12, no. , pp. 304-317, 2013.
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