A communication to support A2X services leveraging PC5 reference points, as defined in TS 23.256. A2X services are realized by various types of A2X applications, e.g., BRID or DAA.

An NG-RAN consisting of ground-based gNBs, which provide cell towers that send signals up to an aircraft's antenna(s) of onboard ATG terminal, with typical vertical altitude of around 10,000 m and take-off/landing altitudes down to 3000 m.

For SRS for positioning Tx frequency hopping, separate BWP configuration outside BWP configuration for data transmission.

The dormant BWP is one of downlink BWPs configured by the network via dedicated RRC signaling. In the dormant BWP, the UE stop monitoring PDCCH on/for the SCell, but continues performing CSI measurements, Automatic Gain Control (AGC) and beam management, if configured.

A group of Serving Cells that is configured by RRC and that have the same DRX Active Time.

A UE with enhanced reduced capabilities as specified in clause 4.2.22.1 of TS 38.306.

HARQ information for DL-SCH, for UL-SCH, or for SL-SCH transmissions consists of New Data Indicator (NDI), Transport Block Size (TBS), Redundancy Version (RV), and HARQ process ID.

gNB that provides network access to UEs via a network of backhaul and access links.

RAN node that supports NR access links to UEs and NR backhaul links to parent nodes and child nodes.

A procedure according to which transmissions are not performed if the channel is identified as being occupied, see TS 37.213.

A candidate cell configured for LTM as defined in TS 38.331.

Message transmitted on UL-SCH containing a C-RNTI MAC CE or CCCH SDU, submitted from upper layer and associated with the UE Contention Resolution Identity, as part of a Random Access procedure.

Mode of operation of a remote UE in RRC_CONNECTED configured with one direct path on which the UE connects to gNB using NR Uu, and one indirect path on which the UE connects to the same gNB via a relay UE using L2 U2N relay operation or non-3GPP connectivity (N3C).

AS functionality providing both direct path and indirect path via relay UE with non-3GPP connectivity.

A configured grant configuration that includes multiple consecutive configured uplink grants within a single periodicity.

NCR-node function, which performs amplifying-and-forwarding of UL/DL RF signals between gNB and UE. The behavior of the NCR-Fwd is controlled according to the side control information received by the NCR-MT from a gNB.

NCR-node entity which communicates with a gNB via a control link to receive side control information. The control link is based on NR Uu interface.

RAN node comprising NCR-MT and NCR-Fwd.

An NG-RAN consisting of gNBs, which provide non-terrestrial NR access to UEs by means of an NTN payload embarked on an airborne or space-borne NTN vehicle and an NTN Gateway.

NR link used for backhauling between an IAB-node and an IAB-donor, and between IAB-nodes in case of a multi-hop backhauling.

AS functionality enabling at least V2X Communication as defined in TS 23.287 and ProSe communication (including ProSe non-Relay, UE-to-Network Relay and UE-to-UE Relay communication (including ProSe UE-to-UE Relay communication with integrated discovery)) as defined in TS 23.304, between two or more nearby UEs, using NR technology but not traversing any network node.

AS functionality enabling ProSe non-Relay discovery, ProSe UE-to-Network Relay discovery and ProSe UE-to-UE Relay discovery for Proximity based Services as defined in TS 23.304, between two or more nearby UEs, using NR technology but not traversing any network node.

Any NR Sidelink-based transmission, including transmission for NR sidelink discovery, transmission for NR sidelink communication, transmission of SL-PRS, and transmission for A2X communication.

A time duration (i.e. one or a consecutive number of symbols) during which the MAC entity is configured to monitor the PDCCH.

Transmission of positioning SRS on multiple carriers in RRC_CONNECTED and RRC_INACTIVE where the positioning SRS resources are linked in RRC configuration as defined in TS 38.331.

A time window during which UE may perform PRS measurement inside the active DL BWP with the same numerology as the active DL BWP without measurement gap.

AS functionality enabling ranging-based services and sidelink positioning as specified in TS 23.586.

A RB set refers to a contiguous set of resource blocks (RBs) on which a channel access procedure is performed in shared spectrum as defined in TS 37.213.

A UE with reduced capabilities as specified in clause 4.2.21.1 in TS 38.306.

A PCell, a PSCell, or an SCell in TS 38.331.

Sidelink transmission information included in an SCI for an SL-SCH transmission or SL-PRS transmission with or without SL-SCH transmission on SL-PRS shared resource pool as specified in clause 8.3 and 8.4 of TS 38.212 consists of Sidelink HARQ information including NDI, RV, Sidelink process ID, HARQ feedback enabled/disabled indicator, Sidelink identification information including cast type indicator, Source Layer-1 ID and Destination Layer-1 ID, and Sidelink other information including CSI request, SL-PRS request, SL-PRS resource ID, a priority, a communication range requirement and Zone ID.

Delay budget before which the SL-PRS is expected to be transmitted by the Tx UE.

A sidelink resource pool which can be used for the transmission of SL-PRS and cannot be used for the transmission of PSSCH.

A sidelink resource pool which can be used for the transmission of both SL-PRS and PSSCH.

SL-PRS transmission information on SL-PRS dedicated resource pool is included in an SCI for an SL-PRS transmission on SL-PRS dedicated resource pool, as specified in TS 38.212, consisting of

Transmit frequency hopping of positioning SRS in RRC_INACTIVE and RRC_CONNECTED.

An area consisting of a list of cells within which the corresponding positioning SRS configuration is considered as valid.

For Dual Connectivity operation the term Special Cell refers to the PCell of the MCG or the PSCell of the SCG depending on if the MAC entity is associated to the MCG or the SCG, respectively. Otherwise the term Special Cell refers to the PCell. A Special Cell supports PUCCH transmission and contention-based Random Access, and is always activated.

A group of Serving Cells that is configured by RRC and that, for the cells with a UL configured, using the same timing reference cell and the same Timing Advance value. A Timing Advance Group containing the SpCell of a MAC entity is referred to as Primary Timing Advance Group (PTAG), whereas the term Secondary Timing Advance Group (STAG) refers to other TAGs.

For non-terrestrial networks, the sum of the UE's Timing Advance value (see clause 4.3.1 of TS 38.211) and kmac.

AS functionality enabling V2X Communication as defined in TS 23.285, between nearby UEs, using E-UTRA technology but not traversing any network node.

Aircraft-to-Everything

Aperiodic

Beam Failure Recovery

Broadcast Remote Identification

Buffer Status Report

Bandwidth Part

Control Element

Cell Group

Configured Grant-based SDT

Cancellation Indication RNTI

Channel State Information

CSI Interference Measurement

CSI Reference Signal

Configured Scheduling RNTI

Detect And Avoid

Dual Active Protocol Stack

DCI with CRC scrambled by PS-RNTI

DownLink-Positioning Reference Signal

Delay Status Report

Discontinuous Transmission

Group Configured Scheduling RNTI

Group RNTI

Integrated Access and Backhaul

Interruption RNTI

Listen Before Talk

Logical Channel Group

Logical Channel Prioritization

L1/L2 Triggered Mobility

Multicast/Broadcast Services

MBS Control Channel

MBS Control Channel RNTI

Master Cell Group

Mobile Originated SDT

Multi-path

Maximum Permissible Exposure

MBS Traffic Channel

Mobile Terminated SDT

Non-3GPP Connection

Non Cell Defining SSB

Network-Controlled Repeater

Network Slice AS Group

Normal Uplink

Non-Zero Power CSI-RS

Packet Delay Budget

Paging Early Indication RNTI

Power Headroom Report

PC5 QoS Identifier

Power Saving RNTI

PDU Set Importance

Primary Timing Advance Group

Point to Multipoint

Point to Point

Quasi-colocation

PRS Processing Window

Positioning Reference Signal

Random Access-based SDT

Remote Radio Head

Reference Signal

Secondary Cell Group

Small Data Transmission

Slot Format Indication RNTI

System Information

SL-PRS Configured Scheduling RNTI

SL-PRS RNTI

Sidelink Configured Scheduling RNTI

Sidelink PRS

Sidelink RNTI

Special Cell

Semi-Persistent

Semi-Persistent CSI RNTI

Semi-Persistent Scheduling

Scheduling Request

SRS Resource Indicator

Synchronization Signals

Synchronization Signal Block

Secondary Timing Advance Group

Supplementary Uplink

Timing Advance Group

Transmission Configuration Indicator

Transmit Power Control-Sounding Reference Signal-RNTI

Time Resource Indicator Value

Transmit/Receive Point

CSI-RS for tracking

UE-to-Network

UE-to-UE

Uplink Control Information

Unused Transmission Occasion - UCI

Uplink Time Window

Vehicle-to-Everything

Zero Power CSI-RS