By Asuncion Santamaria, Francisco J. Lopez-Hernandez
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Extra info for Wireless Lan Standards and Applications (Artech House Telecommunications Library)
Reset causes all unacknowledged data units to be discarded. All counters and timers are reset. A reset only occurs if both ends of the connection agree to it. ω Disconnection request terminates the logical connection, and all outstanding data units are discarded. No confirm primitive is needed since the disconnection is always successful. 3 Configurations and operating characteristics Data link states A data link channel can be in one of two basic states: connection (when two or more nodes have an established connection and are exchanging control and/or information frames) and contention (when a connection is disconnected or when no connection ever existed).
Since up-down collisions are very destructive, any MAC should take it into account carefully. The first two problems can be eliminated by careful coordination between APs. However, the up-down collision can only be alleviated; it can never be solved practically.
A MAC design that creates difficulty in other parts/layers of the system is undesirable. 4. Fairness of access: The fading characteristics of indoor channels may cause unequal received power at the base station even when power control is enforced. Such a situation may result in unfair access to the network. That is, one mobile node may receive much less power at the base station than another mobile node. When the MAC protocol is operating in the contention mode (necessary for initial registration and often used for uplink traffic), the disadvantaged mobile node may not have a chance to access the channel for a while.
Wireless Lan Standards and Applications (Artech House Telecommunications Library) by Asuncion Santamaria, Francisco J. Lopez-Hernandez