5G TERMS AND ACRONYMS

SS-SINR – Synchronization signal signal-to- interference-plus-noise ratio

What is SS-SINR? SS-SINR (SS Signal-to-Interference-plus-Noise Ratio) is the ratio of the SS reference signal power to the combined interference and noise power, measured per

SSS – Secondary synchronization signal

What is SSS? SSS (Secondary Synchronization Signal) is the second synchronization signal in the 5G NR SS/PBCH block, transmitted alongside the PSS and PBCH. While

Standalone NR

What is Standalone NR? Standalone NR (SA) is the target 5G deployment architecture where the NR gNB connects directly to the 5G Core (5GC) without

SU-MIMO – Single user, multiple-input / multiple-output

What is SU-MIMO? SU-MIMO (Single-User MIMO) is an application of MIMO technology where the base station communicates with a single UE using multiple spatial streams

TDD – Time division duplex

What is TDD? TDD is a duplexing method where uplink and downlink transmissions share the same frequency band but are separated in time — alternating

Traffic Flow Template (LTE)

In LTE, Traffic Flow Templates (TFTs) are set up both on the mobile device and at the Packet Gateway (P-GW) to decide if a specific

Transmit diversity

What is Transmit Diversity? Transmit diversity is a technique that combats signal fading by transmitting the same information from two or more independent antennas, ensuring

Transport Block

In UMTS, a Transport Block (TB) refers to the data accepted by the physical layer for joint encoding. The timing of the transport block is

TRX – Transceiver

What is TRX? A TRX (Transceiver) is an electronic device or module that integrates both a transmitter and a receiver, enabling bidirectional wireless communication through

TT – Test tolerance

What is TT? TT (Test Tolerance) represents the allowable margin of error applied to 3GPP conformance test limits to account for measurement uncertainty in the

TTI – Transmission time intervals

What is TTI? TTI (Transmission Time Interval) is the duration of a single transmission on the air interface — the minimum time unit over which

Tunnel Endpoint Identifier

The TEID serves as a unique identifier for a tunnel endpoint within the GTP-U (GPRS Tunnelling Protocol – User) or GTP-C (GPRS Tunnelling Protocol –

Tx – Transmit

What is Tx? Tx (Transmit) in wireless communications refers to the process of sending data through the air from one device to another. The transmit

UDM – Unified data management

What is UDM? The UDM is the 5G Core network function that serves as the master repository for subscriber data — including authentication credentials, subscription

UE – User equipment

What is UE? User Equipment (UE) is the 3GPP term for any device that connects to the mobile network using a standardised radio interface. In

UE emulation

What is UE Emulation? UE emulation is the simulation of subscriber device (UE) behaviour using test equipment that mimics the signalling, traffic patterns, and RF

UF-OFDM – Universal filtered orthogonal frequency division multiplexing

What is UF-OFDM? UF-OFDM (Universal Filtered OFDM) is a multicarrier modulation technique that improves the out-of-band characteristics of OFDM by applying filtering to groups of

UL – Uplink

What is UL – Uplink? Uplink (UL) is the transmission direction from the User Equipment (UE) to the base station (gNB in 5G). It carries