2026-04-25 20:54 UTC
New blog post: NB-IoT downlink. This is another post in my series about V16 car warning beacons. Here I explain mostly everything about the LTE NB-IoT downlink. It's perhaps the longest post I've ever written. If you want to know more about NB-IoT this is the place to go.
Replies (2)
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@destevez@mastodon.social 2026-04-25 20:54
I start by showing how to process the NPSS and NSSS synchronization signals and the NRS reference signals. I detect 6 cells with different SNRs. Interestingly, one of them is not synchronized to the rest. I show how the NPSS and NSSS are beamed in patterns of 4 transmissions. Then I show how to decode the NPBCH, the SIB1-NB, and the SI messages containing the rest of the system information. I explain what all the values in the SIB-NBs mean, parsing them in Wireshark.
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@whitequark@social.treehouse.systems 2026-04-25 20:54
@destevez missing link?