802.11g MAC Timings
What are MAC timings in IEEE 802.11g?
MAC timings define intervals like SIFS, DIFS, and backoff times that coordinate wireless transmission scheduling.
What is SIFS and why is it important?
Short Interframe Space (SIFS) is the shortest wait time used before sending acknowledgments or CTS frames, ensuring priority.
How does DIFS differ from SIFS?
Distributed Interframe Space (DIFS) is longer than SIFS and is used by stations before transmitting data frames.
What is the purpose of backoff timers in MAC?
Backoff timers reduce collisions by randomizing transmission attempts after the medium becomes idle.
How does the contention window relate to MAC timings?
It defines the range for random backoff intervals, which changes dynamically to avoid repeated collisions.
What is PIFS and when is it used?
Point Coordination Function Interframe Space (PIFS) has priority between SIFS and DIFS, used mainly by access points to gain medium access.
How do MAC timings support Quality of Service (QoS)?
By adjusting interframe spaces (like AIFS) and contention windows to prioritize traffic types.
Are MAC timings the same for all 802.11 standards?
No, timings vary slightly depending on the standard and frequency band.
What happens if MAC timings are not properly adhered to?
Increased collisions, reduced throughput, and possible communication failures.
Where can I find official MAC timing specifications for 802.11g?
In the IEEE 802.11g standard documents and related technical references.
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