Const
What an end device knows of its relay's scans, TS011-1.0.1 section 3.9.
Nothing: no wake-on-radio frame has gone out yet.
It knows when the relay scans, so a short preamble reaches it.
It sent one, but no acknowledgment came back, so its preamble spans a whole scan period.
What an end device knows of its relay's scans, TS011-1.0.1 section 3.9.