Cheat sheet

Ambient IoT — a tag with no battery

3GPP's Ambient IoT work in under an hour

The shape of it

1 The idea and the people

2 What exists, and where to look

1.2 A tag with no battery
No battery, or a capacitor holding a scrap of harvested charge. Every hard part of this work follows from that one choice.
2.2 Who is building it
Requirements, then architecture, then the messages on the wire. Nearly every oddity in this record is explained by where in that chain a group sits.
3.3 What exists on paper so far, and what does not
A new device type is never just a new device type. It is a change to how things are numbered, registered, measured and charged for.
4.4 Where to look yourself, and what nobody can tell you yet
This record can tell you what happened and where to read it. It cannot tell you why, and anybody who offers you a why from it is filling a gap with a guess.

1.4 A tag with no battery
This is not "low power" as a phone means it. The work opened by asking whether such a device is buildable at all, in a study whose own words are "ultra-low complexity devices with ultra-low power consumption for the very-low end IoT applications". ^[1]
2.4 Who is building it
Leading no work item does not mean doing no work. RAN3 leads none at all, yet filed 805 documents and owns five of the affected specifications. Who holds the pen and who does the work are two different questions. RAN3
3.4 What exists on paper so far, and what does not
Nothing in this data says phase 2 is complete, and nothing says it has failed. A percentage here is a target's progress, not a result — and two rows about the same work can even disagree with each other. Ambient_IoT_Solutions
4.1 Where to look yourself, and what nobody can tell you yet
Never add those document counts together. They are counted per short name, so the four CT items all show the same 959, and the two called FS_AmbientIoT both show the same 1379. AmbientIoT-CT AmbientIoT-CT

Every one was counted out of a file on this machine. Hover a row to read the question that produced it.

The 69 named sources it cites, by what they are.

Specification 19

Work item 17

Wg 12

Quoted wording 11

Meeting document 10

The same subject, overview — Enough to follow the conversation and know what to look up.
The same subject, in depth — The working reference: every mechanism, every parameter.
Every question of this course — 12 of them, on one page.
The final test — 10 questions, 60 per cent to pass.
Every source behind the course — 176 of them, each with its method.

what the RAN feasibility study set out to do — the first two sentences of section 4 of /var/www/whatthespec.net/data/data/wis/970078/RP-232404/RP-232404.md, copied word for word, read 2026-08-04