802.11s PHYs
What is the PHY layer in 802.11s?
The PHY (Physical) layer in 802.11s defines how data is transmitted over the wireless medium using radio signals.
Which base PHY standards does 802.11s use?
It uses PHYs defined in standards like 802.11a, 802.11b, 802.11g, 802.11n, and newer ones as supported.
Does 802.11s define a new PHY?
No, 802.11s builds on existing 802.11 PHYs and adds mesh-specific MAC and management features.
How does PHY choice affect 802.11s performance?
Different PHYs offer varying data rates, range, and robustness, impacting mesh throughput and coverage.
Can 802.11s mesh nodes use different PHYs simultaneously?
Yes, nodes can operate with different PHY capabilities but interoperability depends on supported features.
What modulation schemes are used in 802.11s PHYs?
Common schemes include DSSS, OFDM, and MIMO techniques depending on the base PHY (e.g., BPSK, QPSK, QAM).
Does 802.11s support MIMO PHYs?
Yes, PHYs like 802.11n/ac with MIMO are supported to enhance mesh network capacity.
How is channel bonding used in 802.11s PHYs?
Channel bonding combines adjacent channels to increase throughput on mesh links when supported by the PHY.
What is the role of the PHY preamble in 802.11s?
The preamble synchronizes the receiver with the incoming signal and carries PHY-layer signaling.
Are there PHY-layer changes specific to mesh in 802.11s?
No major changes; 802.11s relies on standard PHY operations, focusing enhancements at MAC and higher layers.
How does PHY rate adaptation work in 802.11s?
Nodes adjust PHY data rates dynamically based on link quality to optimize throughput and reliability.
What frequency bands are supported by 802.11s PHYs?
Both 2.4 GHz and 5 GHz bands are commonly supported, with newer PHYs possibly extending to 6 GHz.
Can 802.11s PHYs use DFS channels?
Yes, if the underlying PHY and regulatory domain allow, DFS channels can be used for mesh communication.
How does PHY affect mesh network latency?
Higher PHY rates generally reduce transmission time, lowering latency in mesh packet forwarding.
Is power control handled at the PHY layer in 802.11s?
Power control mechanisms exist and can be managed to optimize signal strength and reduce interference.
How do PHY characteristics influence mesh routing?
PHY conditions like link quality and rate influence route selection and path stability in mesh networks.
Does 802.11s support multiple PHYs on the same device?
Some devices support multiple PHY interfaces or radios for enhanced mesh capabilities.
Where can I find detailed PHY specifications for 802.11s?
PHY details are in the base 802.11 standards; 802.11s focuses on mesh MAC and management enhancements.
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