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Overview of 3GPP Standardization

How initial GSM series have been split into 3GPP series
Following the  Q3/21  Plenary Meetings, here are the new TS/TR:
22 839847
23 247256304548554700‑79745
24 821
28 814
33 326854
38 845847860861
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 June 2020, up to Rel‑16).
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. We have taken advantage of this in order to highlight the number of the 3GPP Release number at which a section, and by the way a topic, has been taken into account during the evolution of a document.
Here are some statistics in regards to 3GPP-series.

3GPP Working Environment

3GPP Series TS TR sTR Σ
21-series 6 10 2 18
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 93 37 76 206
23-series 142 19 158 319
24-series 154 3 14 171
29-series 200 16 34 250
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 76 16 165 257
37-series 30 9 51 90
38-series 68 7 56 131
45-series 11 7 4 22

3GPP Security

3GPP Standardization Domain: Security
3GPP Series TS TR sTR Σ
33-series 57 17 51 125
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 314 2 64 380
28-series 111 17 128
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 96 52 15 163
46-series 23 3 26
27-series 8 2 10
31-series 22 4 4 30
51-series 12 12