Wi-Fi doesn’t just send data.
It negotiates, listens, and adapts—constantly.
Trigger frames are lightweight control packets.
They tell devices how to respond.
Here’s how they break down:
00 – Basic Frame
Allocates resource units (RUs) for upstream data.
Used for multiuser scheduling.
01 – Beamforming Report Poll
Asks devices for beamforming feedback.
Helps shape and direct signals for better performance.
02 – Multiuser Block Ack Request
Requests acknowledgment from several users.
Used to confirm data was received correctly.
03 – Multiuser Request to Send
Reserves RUs and checks for potential collisions.
Prevents interference before it happens.
04 – Buffer Status Report Poll
Polls devices for their buffer status.
Helps manage traffic based on how full each device’s queue is.
05 – Groupcast with Retries (MU-BAR)
Requests ACKs for multicast retransmissions.
Ensures group messages don’t get lost.
06 – Bandwidth Query Report Poll
Asks devices about current channel conditions.
Useful for adaptive bandwidth control.
07 – NDP Feedback Report Poll
Checks sleeping devices for buffered data.
Helps wake them only when needed.
These frames aren’t flashy.
They’re not about speed or power.
They’re about coordination and timing.
Thanks for reading.
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