School of Specs

Every course

7 subjects. Each one is offered at up to three depths, from a quick start you finish in under an hour to the working reference.

How standards actually get made

The machinery behind 3GPP and the IETF: who writes a standard, how a proposal becomes a published document, and what a release really is.

How the work is done 21.900 v20.0.0 27 chapters 139 questions

The 5G system architecture

3GPP TS 23.501 — which functions a 5G network is made of, what each one is responsible for, and how they talk to each other.

One document 23.501 v20.2.0 38 chapters 214 questions

Ambient IoT — a tag with no battery

An area of 3GPP work that crosses a dozen groups: devices with no battery, studied in Rel-19 and specified into Rel-20. What the work is for, who did what, and where to read on.

An area of work 25 chapters 117 questions

Sensing — the network as a radar

An area of 3GPP work that crosses the groups: using the network's own radio to detect and locate things. Studied in Rel-19, specified for Rel-20. What the work is for, who did what, and where to read on.

An area of work 25 chapters 126 questions

TSG RAN — the group that specifies the radio

3GPP's radio access group and its six working groups: who owns what, how a radio feature is agreed, and how to read what they produce.

A working group 38.300 v19.3.0 27 chapters 142 questions

CT1 — the group that writes what your phone says

3GPP's core-network protocol group: what it owns, how it decides, and how to read what it produces.

A working group 24.501 v20.0.0 25 chapters 124 questions

Inside one plenary: TSG SA#112, Singapore, June 2026

What a 3GPP plenary decides, how it decides it, and how to read the paper trail of any meeting yourself.

One meeting 23 chapters 112 questions