Content for TS 38.321 Word version: 18.3.0

1… 4… 5… 5.1.2… 5.2… 5.4… 5.4.4… 5.5… 5.9… 5.18… 5.18.18… 5.19… 5.22… 5.22.1.4… 5.22.2… 5.23… 6… 6.1.3… 6.1.3.8… 6.1.3.11… 6.1.3.17… 6.1.3.21… 6.1.3.26… 6.1.3.31… 6.1.3.37… 6.1.3.42… 6.1.3.49… 6.1.3.53… 6.1.3.59… 6.1.3.64… 6.1.3.70… 6.1.3.74… 6.1.3.79… 6.1.4… 6.2… 7…

3.1 Definitions 3.2 Abbreviations
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1 Scope p. 10

The present document specifies the NR MAC protocol.

2 References p. 10

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

[1]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

TS 38.300: "NR; Overall description; Stage 2".

[3]

TS 38.322: "NR; Radio Link Control (RLC) protocol specification".

[4]

TS 38.323: "NR; Packet Data Convergence Protocol (PDCP) protocol specification".

[5]

TS 38.331: "NR; Radio Resource Control (RRC); Protocol specification".

[6]

TS 38.213: "NR; Physical Layer Procedures for control".

[7]

TS 38.214: "NR; Physical Layer Procedures for data".

[8]

TS 38.211: "NR; Physical channels and modulation".

[9]

TS 38.212: "NR; Multiplexing and channel coding".

[10] Void.

[11]

TS 38.133: "NR; Requirements for support of radio resource management".

[12]

TS 36.133: "Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements for support of radio resource management".

[13]

TS 26.114: "Technical Specification Group Services and System Aspects; IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and interaction".

[14]

TS 38.101-1: "NR; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone".

[15]

TS 38.101-2: "NR; User Equipment (UE) radio transmission and reception; Part 2: Range 2 Standalone".

[16]

TS 38.101-3: "NR; User Equipment (UE) radio transmission and reception; Part 3: Range 1 and Range 2 Interworking operation with other radios".

[17]

TS 36.213: "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer Procedures".

[18]

TS 37.213: "Physical layer procedures for shared spectrum channel access".

[19]

TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services".

[20]

TS 23.285: "Architecture enhancements for V2X services".

[21]

TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification".

[22]

TS 36.321: "Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC); Protocol specification".

[23]

TS 37.355: "Evolved Universal Terrestrial Radio Access (E-UTRA); LTE Positioning Protocol (LPP)".

[24]

TS 38.215: "NR; Physical layer measurements".

[25]

TS 38.306: "NR; User Equipment (UE) radio access capabilities".

[26]

TS 23.304: "Proximity based Services (ProSe) in the 5G System (5GS)".

[27]

TS 38.473: "NG-RAN; F1 Application Protocol (F1AP)".

[28]

TS 24.587: "Technical Specification Group Core Network and Terminals; Vehicle-to-Everything (V2X) services in 5G System (5GS)".

[29]

TS 24.554: "Technical Specification Group Core Network and Terminals; Proximity-services (ProSe) in 5G System (5GS) protocol".

[30]

TS 23.586: "Technical Specification Group Services and System Aspects; Architectural Enhancements to support Ranging based services and Sidelink Positioning".

[31]

TS 23.256: "Support of Uncrewed Aerial Systems (UAS) connectivity, identification and tracking; Stage 2".

3 Definitions, symbols and abbreviations p. 11

3.1 Definitions p. 11

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

A2X communication:

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.

Air to Ground network:

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.

BWP for SRS for positioning Tx frequency hopping:

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

Dedicated SL-PRS resource pool:

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

Dormant BWP:

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.

DRX group:

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

eRedCap UE:

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

HARQ information:

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.

IAB-donor:

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

IAB-node:

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

Listen Before Talk:

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

LTM candidate cell:

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

Msg3:

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.

Multi-path:

Mode of operation of a 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 another UE using PC5 unicast link or non-3GPP connection (N3C).

Multi-PUSCH configured grant:

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

N3C indirect path:

In Multi-path, the indirect path using Non-3GPP Connection between remote UE and relay UE.

NCR-Fwd:

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-MT:

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.

NCR-node:

RAN node comprising NCR-MT and NCR-Fwd.

Non-terrestrial network:

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 backhaul link:

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

NR sidelink communication:

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.

NR sidelink discovery:

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.

NR sidelink transmission:

Any NR Sidelink-based transmission, including transmission for NR sidelink discovery, transmission for NR sidelink communication, transmission for Ranging/Sidelink Positioning, and transmission for A2X communication.

PDCCH occasion:

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

Positioning SRS Bandwidth Aggregation:

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.

PRS Processing Window:

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.

Ranging/Sidelink Positioning:

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

RB set:

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.

RedCap UE:

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

Serving Cell:

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

Shared SL-PRS resource pool:

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

Sidelink transmission information included in an SCI for an SL-SCH transmission or SL-PRS transmission with or without SL-SCH transmission on Shared SL-PRS 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 and COT sharing information.

SL-PRS delay budget:

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

SL-PRS transmission information on SL-PRS Dedicated resource pool:

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

SL-PRS identification information, including cast type indicator, source ID and destination ID;
SL-PRS transmission other information, including SL-PRS priority, SL-PRS request, SL-PRS resource ID and resource reservation period.

SRS for positioning Tx frequency hopping:

Transmit frequency hopping of positioning SRS in RRC_INACTIVE and RRC_CONNECTED.

SRS positioning validity area:

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

Special Cell:

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.

Timing Advance Group:

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.

UE-gNB RTT:

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

V2X sidelink communication:

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

3.2 Abbreviations p. 13

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.

A2X

Aircraft-to-Everything

Aperiodic

BFR

Beam Failure Recovery

BRID

Broadcast Remote Identification

BSR

Buffer Status Report

BWP

Bandwidth Part

Control Element

Cell Group

CG-SDT

Configured Grant-based SDT

CI-RNTI

Cancellation Indication RNTI

CSI

Channel State Information

CSI-IM

CSI Interference Measurement

CSI-RS

CSI Reference Signal

CS-RNTI

Configured Scheduling RNTI

DAA

Detect And Avoid

DAPS

Dual Active Protocol Stack

DCP

DCI with CRC scrambled by PS-RNTI

DL-PRS

DownLink-Positioning Reference Signal

DSR

Delay Status Report

DTX

Discontinuous Transmission

G-CS-RNTI

Group Configured Scheduling RNTI

G-RNTI

Group RNTI

IAB

Integrated Access and Backhaul

INT-RNTI

Interruption RNTI

LBT

Listen Before Talk

LCG

Logical Channel Group

LCP

Logical Channel Prioritization

LTM

L1/L2 Triggered Mobility

MBS

Multicast/Broadcast Services

MCCH

MBS Control Channel

MCCH-RNTI

MBS Control Channel RNTI

MCG

Master Cell Group

MO-SDT

Mobile Originated SDT

MPE

Maximum Permissible Exposure

MTCH

MBS Traffic Channel

MT-SDT

Mobile Terminated SDT

N3C

Non-3GPP Connection

NCD-SSB

Non Cell Defining SSB

NCR

Network-Controlled Repeater

NSAG

Network Slice AS Group

NUL

Normal Uplink

NZP CSI-RS

Non-Zero Power CSI-RS

PDB

Packet Delay Budget

PEI-RNTI

Paging Early Indication RNTI

PHR

Power Headroom Report

PQI

PC5 QoS Identifier

PS-RNTI

Power Saving RNTI

PSI

PDU Set Importance

PTAG

Primary Timing Advance Group

PTM

Point to Multipoint

PTP

Point to Point

QCL

Quasi-colocation

PPW

PRS Processing Window

PRS

Positioning Reference Signal

RA-SDT

Random Access-based SDT

RRH

Remote Radio Head

Reference Signal

SCG

Secondary Cell Group

SDT

Small Data Transmission

SFI-RNTI

Slot Format Indication RNTI

System Information

SL-PRS-CS-RNTI

SL-PRS Configured Scheduling RNTI

SL-PRS-RNTI

SL-PRS RNTI

SL-CS-RNTI

Sidelink Configured Scheduling RNTI

SL-PRS

Sidelink PRS

SL-RNTI

Sidelink RNTI

SpCell

Special Cell

Semi-Persistent

SP-CSI-RNTI

Semi-Persistent CSI RNTI

SPS

Semi-Persistent Scheduling

Scheduling Request

SRI

SRS Resource Indicator

Synchronization Signals

SSB

Synchronization Signal Block

STAG

Secondary Timing Advance Group

STx2P

Simultaneous Transmission with 2 Panels

SUL

Supplementary Uplink

TAG

Timing Advance Group

TCI

Transmission Configuration Indicator

TPC-SRS-RNTI

Transmit Power Control-Sounding Reference Signal-RNTI

TRIV

Time Resource Indicator Value

TRP

Transmit/Receive Point

TRS

CSI-RS for tracking

U2N

UE-to-Network

U2U

UE-to-UE

UCI

Uplink Control Information

UTO-UCI

Unused Transmission Occasion - UCI

UTW

Uplink Time Window

V2X

Vehicle-to-Everything

ZP CSI-RS

Zero Power CSI-RS