5G Stuff: Definitions and Abbreviations used in 5G NR

As per various 3GPP specifications, following (list will be growing as I read more and more) are definitions and abbreviations related to 5G Technology

gNB:      NR node

K_eNB:      eNB key

NextGen Core: Core Network for Next Generation System.

NG:        The interface between a gNB and a NextGen Core.

Multi-Connectivity:           Mode of operation whereby a multiple Rx/Tx UE in the connected mode is configured to utilise radio resources amongst E-UTRA and/or NR provided by multiple distinct schedulers connected via non-ideal backhaul

S-K_eNB:   SeNB key

Transmission Reception Point:      Antenna array with one or more antenna elements available to the network located at a specific geographical location for a specific area.

NR-PSS/SSS:        Primary and Secondary synchronisation signal for NR.

AMF                       Access and Mobility Management Function

CA                          Carrier Aggregation

CSI-RS                  Channel State Information Reference Signal

DC                          Dual Connectivity

MCG                      Master Cell Group, has one Pcell and one or more Scells

MN                         Master Node

NG-U                     NG for the user plane

NR                          New Radio

Pcell                      Primary cell, one of the cells belong to MCG
PSCell                    Primary SCell, one of the cells belong to SCG, also configured UL CC in DC

SCG                       Secondary Cell Group, has one PScell and one or more SScells

SeNB                     Secondary eNB
SMF                       Session Management Function

SN                          Secondary Node

TRxP                     Transmission Reception Point
UDM                       Unified Data Management
UDR                        Unified Data Repository
UPF                        User Plane Function

URLLC                 Ultra-Reliable and Low Latency Communications

WT                         WLAN Termination
5GS                      5G System

Other terminologies taken from the existing technologies

Co-located cell: Both 5G NR and LTE ( cells  can be macro or small) eNBs located in the same location

Non-located cell : 5G NR and LTE ( again cells  can be macro or small) eNBs located in different location 

Cells belong to MCG are connected/controlled by MeNB, similarly cells belong to SCG are connected/controlled by SeNB.