3GPP resource usage and search tutorial
I have been developing related work in the laboratory before, and I don't know much about the content of the agreement. When I tried to download the protocol on 3GPP, I found that there was too much content on 3GPP, and I didn't find the protocol I wanted for a long time. I didn’t see a complete 3GPP tutorial on Baidu, so I thought about organizing one for your reference.
This article first briefly introduces the composition of 3GPP (mainly learn from Baidu Encyclopedia), then introduces 3GPP FTP, and finally talks about how to download the desired protocol on the 3GPP official website (mainly learn from references [2]).
1 Introduction to 3GPP
1.1 Concept
3GPP, 3rd Generation Partnership Project, that is, the third generation partnership project. The reason why it is called 3GPP, not 2GPP or 4GPP, is because in December 1998, a number of telecommunications standards organizations signed the "Third Generation Partnership Project Agreement", which aims to formulate global applicable technical specifications and specifications for third-generation mobile communication systems. Technical Reports. Subsequently, the scope of the 3GPP's work has been improved, increasing the research and standard formulation of the Universal Terrestrial Radio Access (UTRA) long-term evolution system. This is why we see that 3GPP is also working on the standardization of 4G and 5G.
1.2 Organizational structure
3GPP includes six organizational partners (OP) such as ETSI in Europe, TIA in the United States, TTC in Japan, ARIB, TTA in South Korea, and CCSA in China. There are currently more than 300 independent members. In addition, 3GPP has 13 market partners (MRP) including TD-SCDMA Industry Alliance (TDIA), TD-SCDMA Forum, and CDMA Development Group (CDG).
As shown in the figure below, in the organizational structure of 3GPP, the project coordination group (PCG, Project Cooperation Group) is at the top, which is composed of 6 OPs: ETSI, TIA, TTC, ARIB, TTA and CCSA. Specification Group) for management and coordination. 3GPP is divided into 4 TSGs (previously 5 TSGs, and later CN and T merged into CT), namely TSG GERAN (GSM/EDGE radio access network), TSG RAN (radio access network), TSG SA (business And system), TSG CT (core network and terminal).
Each TSG is divided into multiple working groups. For example, the TSG RAN responsible for LTE standardization is divided into RAN WG1 (wireless physical layer), RANWG2 (radio layer 2 and layer 3), RAN WG3 (wireless network architecture and interface), RAN WG4 (radio frequency performance) and RAN WG5 (terminal consistency) Test) 5 working groups.
1.3 Protocol version management
The standard specifications formulated by 3GPP are managed with Release as the version. On average, one version will be completed in one to two years, from R99 at the beginning of its establishment to R4, and now it has developed to R10. The earliest various third-generation specifications were compiled into the original 99 version, which was completed in March 2000, and subsequent versions are no longer named after the year.
3GPP manages and develops work in the form of projects. The most common forms are Study Item and Work Item. 3GPP manages the standard text in a series of ways. For example, the common WCDMA and TD-SCDMA access network standards are in the 25 series, the core network standards are in the 22, 23, and 24 series, and the LTE standard is in the 36 series. .
2 3GPP FTP
When I first downloaded the protocol on the 3GPP website, I always went around on the 3GPP official website http://www.3gpp.org/ and couldn’t find the information I wanted. Later, after my brother’s advice, I found out that 3GPP still has various types of protocols and meeting records, such as FTP http://www.3gpp.org/ftp/ .
The main directory of 3GPP FTP is shown in the figure below. The directory structure of FTP is basically consistent with the 3GPP organizational structure. Among them, tsg_cn corresponds to the documents related to the previous TSG_CN technical specification group, and tsg_t corresponds to the documents related to the TSG_T technical specification group. Because these two technical specification groups were later merged into the TSG_CT technical specification group, the two folders tsg_cn and tsg_t are in It will no longer be updated after 2008. The four folders tsg_ct, tsg_geran, tsg_ran, and tsg_sa correspond to documents related to the TSG_CT technical specification group, TSG_GERAN technical specification group, TSG_RAN technical specification group, and TSG_SA technical specification group, respectively. The Specs folder stores the protocol documents of each series of 3GPP.
We take the tsg_ran folder as an example to explain its internal structure. After clicking into the tsg_ran folder, we see its directory structure as shown in the figure below. It can be seen that its directory structure is basically consistent with the working group of the TSG_RAN technical specification group. After clicking into the WG1_RL1, WG2_RL2, WG3_Iu, WG4_Radio folders, you can see the meeting documents of the corresponding working group.
For example, if we enter the directory http://www.3gpp.org/ftp/tsg_ran/TSG_RAN/TSGR_76/, we can see the proposal of the meeting in its Docs folder, that is, http://www.3gpp. The contents in the org/ftp/tsg_ran/TSG_RAN/TSGR_76/Docs/ folder are the proposals received at the meeting.
Three protocol download
3.1 Introduction
The documents issued by 3GPP can be roughly divided into TR (Technical Report) and TS (Technical Specification). Examples of numbers are as follows: TS 23.003 7.1.0; TR 32.818 1.1.0. Take "TS 23.003 7.1.0" as an example. "23" is the serial number. Different series correspond to different modules of the standard framework. For details, please refer to http://www.3gpp.org/specs/numbering.htm, namely As shown in the table below. "23.003" is the standard number, "7.1.0": "7" means that the standard version is "3GPPR7", and "*.1.0" is the minor version number. Note: The specifications of the 00-13 series have only two digits.
00～13 series: GSM only (before Rel-4), this series of specifications is still applicable to China Mobile and China Unicom's network in some areas.
21～36 series: 3G/GSM R99 and later, currently only when the third digit is zero (such as TS 23.013) can it be applied to GSM; nowadays IMS\HSDPA\HSUPA\LTE\SAE\MBMS and other popular concepts , All refer to this part of the standard;
41~55 series: GSM only (Rel-4 and later). Both China Unicom and China Mobile have basically completed the introduction of softswitch in the core network. Therefore, the network at this stage is suitable for referencing this part of the specification.
3.2 Commonly used methods
(1) If you know the standard number you are looking for:
http://www.3gpp.org/ftp/Specs/archive/
(2) If you do not know the standard number you are looking for:
http://www.3gpp.org/specs/numbering.htm
(3) If you want to know the network that you care about, such as IMS\HSDPA\HSUPA\LTE...the standard situation in 3GPP, and the efficiency of (2) is not high, then go to the latest catalog of specifications: (download Please confirm the version you want before, such as R4? R5? R7?...)
TS21.101 ：Technical Specifications andTechnical Reports for a UTRAN-based 3GPPsystem
TS41.001 ：GSM Specification set
TS01.01 ：Technical Specifications andTechnical Reports for a GERAN-based 3GPP system
For most people, the main focus is on TS 21.101
(4) If you just want to understand the architecture of the UMTS network: Download TS 23.002
Four summary
I feel that 3GPP is too large, and the information on the 3GPP website is also very rich and complicated. It can be seen that the standardization of communication systems is a very difficult task.
If you want to find the relevant information/agreement, it is best to determine which technical specification group the information you are looking for belongs to, or the specific number of the agreement, etc. It may be difficult to find the information if you don't know this information.
At present, I don’t know much about the use of 3GPP resources. If there is something wrong or there is a better way, I welcome your corrections. Finally, thanks to the blogger in Reference [2], the third part of this article mainly draws on the content of his blog.
Five references
[1] http://baike.baidu.com/item/3GPP
[2] http://blog.sina.com.cn/s/blog_4b6a75060100jjhm.html