FCC planning to open up 1200 MHz of spectrum for unlicensed / Wi-Fi usage [pdf]

Re:FCC planning to open up 1200 MHz of spectrum for unlicens... by bcrl on Thursday April 02, 2020 @12:42PM (#22760864)

That's exactly how wifi works. If there's no data to be transferred, the radio's transmitter is off and it is not using the spectrum. That said, periodic beacons and keepalives defined in various protocols will cause data to be sent from time to time.

[ Parent | on HN ]

Re:FCC planning to open up 1200 MHz of spectrum for unlicens... by labawi on Friday April 03, 2020 @01:43PM (#22772038)

Interpreting an SSID closes to me, with 0 activity (noone connects there). According to wireshark, beacon takes 516µs at 6Mbit/s with 40 beacons/s, which equals 500e-6 * 40 = 0.02 = 2% airtime goes to a single SSID with 0 traffic. Typical settings are 10 beacon/s which would be 0.5%, but 2.4Ghz has 1Mbit/s default rate, so about 3%.

With 20 idle SSIDs on 2.4Ghz with default settings, roughly 50% of airtime is spent on SSID broadcast.

[ Parent | on HN ]