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This paper considers the medium access problem in the IEEE 802.11 standard. Although the transmission bit rates have clearly increased, some MAC related problems remain unsolved. The random channel contention suffers from short term unfairness and from the considerable reduction of the effective throughput due to the collision probability that increases with the number of contending nodes in the network. The authors' objective is to define a coordinated access mechanism that improves the effective throughput and grants a fair share of the resources among the network nodes. They propose Transmit And Reserve (TAR), a novel packet based coordinated channel access mechanism that combines advantages from random access and channel assignment.
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