3GPP:TS 38.300 NR; 网络架构

5G的基站节点 NG-RAN node 分为两类:

  • gNB: 5G基站;
  • ng-eNB:非5G基站,LTE/E-UTRAN协议的基站。

  • 5G基站和非5G基站之间通过Xn接口通信。
  • 5G基站和非5G基站都是通过NG接口连接5G核心网。

功能划分

基站的功能:

  • Functions for Radio Resource Management: Radio Bearer Control, Radio Admission Control, Connection Mobility Control, Dynamic allocation of resources to UEs in both uplink and downlink (scheduling);
  • IP header compression, encryption and integrity protection of data;
  • Selection of an AMF at UE attachment when no routing to an AMF can be determined from the information provided by the UE;
  • Routing of User Plane data towards UPF(s);
  • Routing of Control Plane information towards AMF;
  • Connection setup and release;
  • Scheduling and transmission of paging messages;
  • Scheduling and transmission of system broadcast information (originated from the AMF or O&M);
  • Measurement and measurement reporting configuration for mobility and scheduling;
  • Transport level packet marking in the uplink;
  • Session Management;
  • Support of Network Slicing;
  • QoS Flow management and mapping to data radio bearers;
  • Support of UEs in RRC_INACTIVE state;
  • Distribution function for NAS messages;
  • Radio access network sharing;
  • Dual Connectivity;
  • Tight interworking between NR and E-UTRA.

AMF(Access and Mobility Management Function)的功能(see 3GPP TS 23.501 [3]):

  • NAS signalling termination;
  • NAS signalling security;
  • AS Security control;
  • Inter CN node signalling for mobility between 3GPP access networks;
  • Idle mode UE Reachability (including control and execution of paging retransmission);
  • Registration Area management;
  • Support of intra-system and inter-system mobility;
  • Access Authentication;
  • Access Authorization including check of roaming rights;
  • Mobility management control (subscription and policies);
  • Support of Network Slicing;
  • SMF selection.

UPF(User Plane Function)的功能 (see 3GPP TS 23.501 [3]):

  • Anchor point for Intra-/Inter-RAT mobility (when applicable);
  • External PDU session point of interconnect to Data Network;
  • Packet routing & forwarding;
  • Packet inspection and User plane part of Policy rule enforcement;
  • Traffic usage reporting;
  • Uplink classifier to support routing traffic flows to a data network;
  • Branching point to support multi-homed PDU session;
  • QoS handling for user plane, e.g. packet filtering, gating, UL/DL rate enforcement;
  • Uplink Traffic verification (SDF to QoS flow mapping);
  • Downlink packet buffering and downlink data notification triggering.

SMF(Session Management function)的功能 (see 3GPP TS 23.501 [3]):

  • Session Management;
  • UE IP address allocation and management;
  • Selection and control of UP function;
  • Configures traffic steering at UPF to route traffic to proper destination;
  • Control part of policy enforcement and QoS;
  • Downlink Data Notification.

Multi-RAT Dual Connectivity(MR-DC)

NG-RAN 节点需要支持Multi-RAT Dual Connectivity,即UE可以通过RRC_CONNECTED 可以由两个调度器配置,当Backhaul非理想状态下,可以提供ng-eNB接入或者NR接入。

你可能感兴趣的:(NR,3GPP)