1 Overview
1.1 Definitions
5G: 5th Generation Mobile Networks / 5th Generation Wireless Systems, 5th generation mobile communication technology
1.2. Trademarks
1.3. Process
1.4. Data
Links: ftp://ftp.3gpp.org/ (you may want to climb the wall oh)
Contents: /Specs/archive/38_series/38.300/ 38.300 to the latest version of the directory
Description: 36 series LTE (4G) Technical Series
38 is a series of series 5G, 38.300 (5G overview description)
Comparison 1.2. 5G 4G and the
| xG |
rate (Maximum rate of a single connection) |
Delay (End to end transmission delay) |
Connections (Per km²) |
Mobility (Maximum moving speed) |
| 4G |
100Mbps |
30~50ms |
10000 |
350KM/h |
| 5G |
10Gbps |
1ms |
1000000 |
500KM/h |
2. History
1G-- Big Brother
2G-- ordinary mobile phones, mobile phone
3G-- intelligent machines
4G-- intelligent machines
| x Generation |
Communication standards represent |
Theoretical maximum speed (downlink) |
Explanation |
| 1G |
AMPS、TACS |
- |
The main problem to solve voice communications |
| 2G |
GSM、CDMA2000 1X |
236kb/s |
Begin packet data communication support narrowband |
| 3G |
WCDMA、TD-SCDMA、CDMA2000 |
14.4Mb/s |
Development such as pictures, music high broadband multimedia communications, video streams |
| 4G |
TDD-LTE、FDD-LTE |
150Mb/s，100Mb/s |
Designed specifically for the mobile Internet, network speed, capacity, stability increased dramatically |
| 5G |
|
10Gb/s |
|
2.1. 38.300 document parsing
38.300 document as an overview of the document 5G, mainly there is a description of the taking on of 5G technologies and networks. Document preface (forword), the text of Chapter 16, Annex (Annex) three parts.
Preface, is Issue No. conventions and unified explanation. Appendix Additional documentation is necessary in this.
Chapter 1, belongs to the category of documents.
Chapter 2, a reference, can provide the corresponding documents related art, for further reference.
Chapter 3, mainly acronyms. Wang as the communication we need to understand the abbreviations commonly used to read and understand the new technologies of communication "jargon." For example: 5GC 5G represents a core network, gNB 5G represents a base station node, ng-eNB represents 5GC access node of the base station 4G.
Chapter 4 is a description of the overall structure and function of 5G network division.
As shown below, the architecture is divided into two parts 5G 5GC core network and the radio network NG-RAN. NG and Xn are the two main interfaces, the former belongs to the wireless network and core network interfaces, which belongs to the interface between the radio network node.
For core and radio network element, the document described and summarized its functional division:
l wireless network comprises two kinds gNB ng-eNB and NE.
L core network functions mainly AMF, SMF three functions UPF and logical or virtual network element NE undertake.
As shown below:
Later chapters is in accordance with a layered protocol for communication, carry out chapter by chapter started.
Section 5 describes the contents of the physical layer (the Layer1) comprising modulated waveform, subcarrier frequency spacing and radio frame structure. Transmission scheme for the uplink and downlink channels shared channel process, control channel and a broadcast channel, a synchronization signal process, a physical channel processes.
Chapter 6 Layer2 content, including RLC sub-layer, MAC sublayer, the PDCP sublayer, of SDAP sublayer (5G additional) services and functions, also describes CA carrier aggregation, the DC dual link.
Chapter 7 content RRC (Layer3), comprising RRC state (5G increased RRC_INACTIVE, to meet business needs things), system messages, access control, transmission of the NAS message and the like.
Chapter 8 NG code number, including the network side and the terminal side.
Chapter 9 mobility management, state transition, the measurement and handover procedure, the random access and the like.
Chapter 10 is the radio resource management and scheduling down the line.
Chapter 11 describes the terminal power saving, after taking into account the needs of the business of things. The current version of the content is relatively simple.
Chapter 12 QoS description.
Chapter 13 is about the encrypted content.
Chapter 14, terminal capabilities.
Chapter 15, since the configuration management related.
Finally, Chapter 16, vertical applications described, including URLLC, IMS voice (Vo5G), network sections (Nekwork Slice) and the like.
Documents about the content of this agreement, that is, those described above.