802.11w MAC Timings
What are MAC timings in IEEE 802.11w?
MAC timings define intervals and timers that control frame transmission, acknowledgments, and retransmissions with added security considerations.
How does 802.11w affect standard MAC timing intervals?
It maintains standard intervals like SIFS and DIFS but may introduce delays due to management frame protection processing.
What is the impact of Protected Management Frames on timing?
Additional processing for encryption/decryption can slightly increase frame handling time within MAC timing constraints.
Does 802.11w change the Short Interframe Space (SIFS) duration?
No, SIFS duration remains consistent to preserve backward compatibility and timing coordination.
How is timing coordinated for retransmission of protected frames?
Retransmissions follow standard MAC backoff and retry limits while ensuring frame protection is reapplied.
Are timing parameters adjusted for key management frames in 802.11w?
Timing for key exchange and management frames may have additional allowances for security processing.
Does 802.11w introduce new timing intervals?
No new timing intervals are defined, but existing intervals accommodate added security overhead.
What is the effect of 802.11w on Distributed Interframe Space (DIFS)?
DIFS remains unchanged, ensuring consistent medium access coordination.
How does MAC timing ensure timely delivery of protected management frames?
Timings are designed to meet QoS requirements while incorporating frame protection processing.
Are backoff timers affected by 802.11w frame protection?
No, backoff algorithms remain standard to avoid medium access conflicts.
How does 802.11w handle timing for acknowledgments of protected frames?
ACK frames are transmitted within standard SIFS timing, though ACKs themselves are unprotected.
Does 802.11w impact timing for power save mode wake-up intervals?
No direct impact; power saving timing mechanisms operate independently.
How do timing constraints prevent replay attacks in 802.11w?
Timely processing and sequence checks help ensure replayed frames outside timing windows are discarded.
Are timing parameters configurable in 802.11w devices?
Some timing parameters may be configurable to optimize performance but generally follow standard recommendations.
How does 802.11w ensure synchronization between transmitter and receiver timing?
Synchronization relies on standard timing intervals plus secure frame exchanges for coordination.
Does 802.11w affect the timing of beacon frames?
No, beacon timing remains consistent to maintain network synchronization.
What is the timing impact on handoff procedures in 802.11w?
Additional security processing may slightly increase handoff latency but improves overall security.
Are timing measurements important for 802.11w compliance?
Yes, adherence to timing ensures compatibility and security efficacy.
Where can I find official timing specifications for 802.11w?
IEEE 802.11w amendment documents and related IEEE 802.11 standards detail timing parameters.
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