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Overview of 3GPP Standardization

How initial GSM series have been split into 3GPP series
The 3GPP (3rd Generation Partnership Project, created late 90's) is aimed towards the development of standards for the various generations of mobile networks, from 3G to 5G. The 3GPP is organized in 3 main domains or TSGs (Technical Specification Groups): Radio Access Networks (RAN), Service and Systems Aspects (SA), Core Networks and Terminals (CT). New Specifications, or new versions of a number of Specifications, are produced just after the quarterly plenary meetings for each domain. Afterwards, the ETSI publishes the PDF versions for the releases that have been frozen (i.e. from March 2022, up to Rel‑17).
The ETSI does not publish the PDF version for studies (8xx numbers, and sometimes 7xx numbers, referred to as 'sTR' in the context of this site). For a better overview of the contents of a specification or report, we reproduce the Table of Contents (ToC). A particularity of 3GPP standards development is that the original section numbers in a document are preserved. It can be extended, but a deleted section will appear as 'Void' and a section inserted between sections with consecutive numbers will be suffixed with a letter.
Here are some statistics in regards to 3GPP-series.

3GPP Working Environment

3GPP Series TS TR sTR Σ
21-series 6 11 2 19
41-series 2 2 4

3G-, 4G-, 5G-System: Stage 1 to Stage 3

3GPP Standardization Stage1 to Stage 3
3GPP Series TS TR sTR Σ
22-series 96 40 87 223
23-series 148 28 194 370
24-series 161 3 14 178
29-series 228 17 39 284
42-series 8 8
43-series 21 6 4 31
44-series 23 1 24
49-series 3 1 4

3GPP Radio Access Technology (RAT) and Network (RAN)

3GPP Standardization Domain: RAT and RAN
3GPP Series TS TR sTR Σ
25-series 90 43 82 215
36-series 80 16 173 269
37-series 34 9 70 113
38-series 82 8 108 198
45-series 11 7 4 22

3GPP Security

3GPP Standardization Domain: Security
3GPP Series TS TR sTR Σ
33-series 65 20 88 173
35-series 18 6 24
55-series 12 1 13

3GPP Operations, Administration and Maintenance

3GPP Standardization Domain: Operations and Maintenance
3GPP Series TS TR sTR Σ
32-series 316 2 66 384
28-series 122 7 44 173
52-series 3 3

3GPP Media Handling, Terminal Functions, UICC/USIM/Applications

3GPP Standardization Domain: Media Handling, UICC/USIM, Terminal Functions
3GPP Series TS TR sTR Σ
26-series 102 58 20 180
46-series 23 3 26
27-series 8 2 10
31-series 24 4 6 34
51-series 12 12