1 4G基站协议栈回顾

4G架构

4G部署

1.1 空口侧

1.1.1 User-plane

Thefigure below shows the protocol stack for the user-plane, where PDCP, RLC and MACsublayers (terminated in eNB on the network side) perform the functions listedfor the user plane in subclause 6, e.g. header compression, ciphering,scheduling, ARQ and HARQ.

User-planeprotocol stack

ForNB-IoT, the user plane is not used when transfering data over NAS.

NOTE 1:   The NAS control protocol is not covered bythe scope of this TS and is only mentioned for information.

1.1.2 Control-plane

Control-planeprotocol stack

1.2 核心侧

1.2.1 User-plane

1.2.2 Control-plane

数据、信令流总结：

2 5G接入概览

5GSystem architecture

基站部署

3 NG-RAN架构(5G基站实现)

为实现CU-DU分离，有以下概念：

gNB Central Unit(gNB-CU): a logicalnode hosting RRC, SDAP and PDCP protocols of the gNB or RRC and PDCP protocolsof the en-gNB that controls the operation of one or more gNB-DUs.The gNB-CUterminates the F1 interface connected with the gNB-DU.

gNB Distributed Unit(gNB-DU):a logical node hosting RLC, MAC andPHY layers of the gNB or en-gNB, and its operation is partly controlled bygNB-CU. One gNB-DU supports one or multiple cells. One cell is supported byonly one gNB-DU. The gNB-DU terminates the F1 interface connected with thegNB-CU.

gNB-CU-Control Plane(gNB-CU-CP): alogical node hosting the RRC and the control plane part of the PDCP protocol ofthe gNB-CU for an en-gNB or a gNB. The gNB-CU-CP terminates the E1 interfaceconnected with the gNB-CU-UP and the F1-C interface connected with the gNB-DU.

gNB-CU-User Plane(gNB-CU-UP): alogical node hosting the user plane part of the PDCP protocol of the gNB-CU foran en-gNB, and the user plane part of the PDCP protocol and the SDAP protocolof the gNB-CU for a gNB. The gNB-CU-UP terminates the E1 interface connectedwith the gNB-CU-CP and the F1-U interface connected with the gNB-DU.

3.1 协议规范

3.1.1  User-plane 协议

Note 1:    The radio interfaceprotocols are defined in 3GPP TS 38.2xx and TS 38.3xx.

Note 2:    The NG interfaceprotocols are defined in 3GPP TS 38.41x.

3.1.2  Control plane协议

Note 1:    The radio interfaceprotocols are defined in 3GPP TS 38.2xx and TS 38.3xx.

Note 2:    The protocol is definedin 3GPP TS 38.41x. (Description of NG interface).

Note 3:    CM, SM: This exemplifiesa set of NAS control protocols between UE and 5GC. The evolution of theprotocol architecture for these protocols is outside the scope of the presentdocument.

3.2空口侧协议栈

3.2.1 User-plane

User Plane Protocol Stack

3.2.2 Control-plane

Control Plane Protocol Stack

3.2.3 核心侧协议栈(同样是CP UP)

3.3 gNB-CU和 gNB-DU分离架构

Overall architecture

3.1 gNB内部逻辑网元图

The overall architecture for separation ofgNB-CU-CP and gNB-CU-UP is depicted in Figure

Overall architecture for separation ofgNB-CU-CP and gNB-CU-UP

3.4 数据流总结：

以上内容大部分来自3GPP协议，总结是自己YY的，如有不对请指正。