802.11k PHYs
What is the role of the PHY layer in 802.11k?
The PHY layer in 802.11k inherits characteristics from the underlying 802.11 standards and provides mechanisms to support radio measurements.
Does 802.11k define new physical layer specifications?
No, it relies on existing PHY standards like 802.11a/b/g/n but adds measurement capabilities at the MAC/PHY interface.
How does 802.11k use PHY measurements?
It uses PHY measurements such as signal strength, noise, and interference levels to optimize network performance.
Which frequency bands are supported by 802.11k PHY?
It supports 2.4 GHz and 5 GHz bands in line with underlying 802.11 standards.
What PHY metrics are important in 802.11k?
Metrics like Received Signal Strength Indicator (RSSI), Signal-to-Noise Ratio (SNR), and Channel Load are key for measurements.
How does 802.11k help improve PHY performance?
By providing real-time measurement data that can be used for channel selection, power control, and roaming decisions.
Is modulation scheme affected by 802.11k?
No, 802.11k does not change modulation schemes but works with existing PHY features.
Can 802.11k influence transmit power settings?
Yes, measurement reports can inform power control algorithms to optimize coverage and interference.
Does 802.11k support measurement of noise levels?
Yes, noise histograms are part of the PHY measurements to assess interference.
What is the relationship between PHY and MAC in 802.11k?
The PHY provides raw radio data and measurements that the MAC layer uses for decision-making and reporting.
Are timing parameters at the PHY layer important in 802.11k?
Yes, precise timing is crucial for measurement accuracy and synchronization.
How does 802.11k handle multipath and fading at the PHY layer?
It does not directly address PHY impairments but measurement reports can reveal issues caused by multipath.
Is 802.11k compatible with MIMO PHY technologies?
Yes, it works with advanced PHY features like MIMO by collecting relevant measurement data.
How are PHY measurement requests communicated?
Measurement requests are sent as action frames from the MAC layer triggering PHY to perform measurements.
Does 802.11k specify measurement duration or intervals at PHY?
It defines measurement types and durations to ensure consistency in reporting.
Can 802.11k help with interference detection at PHY?
Yes, noise and channel load measurements assist in identifying interference sources.
What PHY information is reported to the AP in 802.11k?
Reports include metrics like RSSI, noise histograms, channel load, and frame errors.
How does 802.11k support enhanced roaming using PHY data?
PHY measurements allow clients and APs to select better channels and access points during roaming.
Is PHY layer firmware impacted by 802.11k features?
Often yes, firmware needs to support measurement reporting and interaction with the MAC layer.
What is the benefit of PHY measurement reports in 802.11k?
They enable smarter network management, improved QoS, and better spectrum utilization.
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