Power Saving Mechanisms in IEEE 802.11i protocol
What power saving mechanisms does IEEE 802.11i support?
802.11i supports Power Save Mode (PSM) and Unscheduled Automatic Power Save Delivery (U-APSD) to conserve client device energy.
How does 802.11i ensure security while devices are in power save mode?
Security keys and protocols remain active, with buffered encrypted data delivered upon wake-up.
What is U-APSD in 802.11i power saving?
Unscheduled Automatic Power Save Delivery allows devices to trigger delivery of buffered frames efficiently with QoS support.
Does 802.11i power saving affect the security handshake?
The handshake remains secure; power saving states are negotiated without compromising security.
How are multicast and broadcast frames handled during power saving?
Delivery Traffic Indication Messages (DTIM) notify clients about buffered multicast/broadcast frames securely.
Are power save features compatible with 802.11i encryption?
Yes, power saving and encryption operate seamlessly together.
How does 802.11i protect buffered frames in access points?
Buffered frames are stored encrypted and delivered only to authorized clients upon wake.
Can 802.11i devices enter sleep state during active security sessions?
Yes, sleep states are supported while maintaining active security associations.
What role does the TIM (Traffic Indication Map) play in power saving?
TIM indicates which clients have buffered data, enabling power-efficient wake-ups.
Is power saving effective in all traffic conditions under 802.11i?
It is most effective with bursty traffic; continuous high traffic may reduce power saving gains.
Do power saving modes introduce latency in secure communications?
Minor latency can occur due to wake-up delays but is balanced against energy savings.
How does 802.11i support battery life in mobile devices?
By combining efficient power save modes with strong security protocols, battery life is optimized.
Are power saving features configurable in 802.11i devices?
Yes, devices can enable or disable power saving modes based on use cases.
Does 802.11i support legacy power save mechanisms?
It is backward compatible with standard 802.11 power save modes while enhancing security.
How are power saving timers managed with secure frames?
Timers coordinate wake/sleep cycles while ensuring secure frame delivery synchronization.
What happens if a device misses buffered frames during sleep?
Retransmission and buffering ensure no loss of secured frames upon next wake.
Is there a power saving impact on throughput in 802.11i?
Some throughput reduction may occur, but energy savings are generally worth the tradeoff.
How does 802.11i handle power saving in mesh networks?
Power saving is coordinated with security protocols in mesh topologies to maintain performance.
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