Here, we will explain how to find the 3GPP standard.
We think the easiest way to find it is to follow the 3GPP Specification Numbering.
http://www.3gpp.org/specifications/specification-numbering
If you go to the 3GPP Specification Numbering site, you will see the screen above.
Green frame part：
It is a column where the standard number corresponding to the standard of 3G or later is described.The lines are divided by function, and among them, “For 3G (W-CDMA): 25 series”
Numbering divided into “4G (LTE): 36 series” and “5G (NR): 38 series”
Some are done.
Roughly speaking, once you have decided on a series of features you want to look up, click the link to get a more subdivided list of features. Here, 36 series is explained.
For each line, check the contents of the described standard and select the standard that matches the content you want to refer to. Here is an example of obtaining a standard for the Physical Layer of LTE Radio Access.
Click the standard number you want to obtain and the following screen will appear.
If you click “Versions” in the above screen, the list of “By Release” and “By Version in Release” will be displayed.
Different releases have different functions described in the standard. Basically, the larger the Release number, the more functions the standard has.
The functions described for each version in the Release are basically the same, but since the standard development process is carried out in parallel, the content that was not decided in time may be reflected in the next version.At the same time, errors and clarification of unclear points in the description of the standard will be carried out.
Basically, it is good to get the latest standard, but since the latest standard has various functions added, the function of the standard you want to refer to is included from the early stage (Release). Then it is often easier to understand by referring to the old Release.
You can get the corresponding standard by clicking the version you want to get in the red frame above.