Content for TS 38.304 Word version: 18.0.0
1 Scope p. 6
The present document specifies the Access Stratum (AS) part of the UE procedures in RRC_IDLE state (also called Idle mode) and RRC_INACTIVE state. The non-access stratum (NAS) part of Idle mode procedures and processes is specified in TS 23.122.
The present document specifies the model for the functional division between the NAS and AS in a UE.
The present document applies to all UEs that support at least NR Radio Access, including multi-RAT UEs as described in 3GPP specifications, in the following cases:
- When the UE is camped on a NR cell;
- When the UE is searching for a cell to camp on;
2 References p. 6
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 38.331: "NR; Radio Resource Control (RRC) - Protocol Specification".
[4]
TS 38.213: "NR; Physical layer procedures for control ".
[5] Void
[6]
TS 36.331: "E-UTRA; Radio Resource Control (RRC) - Protocol Specification".
[7]
TS 36.304: "E-UTRA; User Equipment (UE) procedures in RRC_IDLE state ".
[8]
TS 38.133: "NR; Requirements for Support of Radio Resource Management".
[9]
TS 23.122: "NAS functions related to Mobile Station (MS) in RRC_IDLE state".
[10]
TS 23.501: "System Architecture for the 5G System; Stage 2".
[11]
TS 38.215: "NR; Physical layer measurements".
[12]
TS 22.261: "Service requirements for the 5G system".
[13]
TS 24.890: "5G System - Phase 1; CT WG1 Aspects".
[14]
TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
[15]
TS 38.101-1: "NR; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone".
[16]
TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services".
[17]
TS 23.285: "Technical Specification Group Services and System Aspects; Architecture enhancements for V2X services".
[18]
TS 22.011: "Service accessibility".
[19]
TS 38.321: "NR; Medium Access Control (MAC); Protocol specification".
[20]
TS 26.346: "Multimedia Broadcast/Multicast Service (MBMS); Protocols and codecs".
[21]
TS 23.247: "Architectural enhancements for 5G multicast-broadcast services; Stage 2".
[22]
TS 23.304: "Proximity based Services (ProSe) in 5G Systems (5GS)".
[23]
TS 23.003: "Numbering, addressing and identification".
[24]
TS 38.306: "User Equipment (UE) radio access capabilities".
[25]
TS 23.586: "Technical Specification Group Services and System Aspects; Architectural Enhancements to support Ranging based services and Sidelink Positioning".
3 Definitions, symbols and abbreviations p. 7
3.1 Definitions p. 7
For the purposes of the present document, the following terms and definitions apply:
Acceptable Cell:
A cell that satisfies certain conditions as specified in clause 4.5.
Allowed CAG list:
A per-PLMN list of CAG Identifiers the UE is allowed to access (see TS 23.501).
Available PLMN(s):
One or more PLMN(s) for which the UE has found at least one cell and read its PLMN identity(ies).
Available SNPN(s):
One or more SNPN(s) for which the UE has found at least one cell and read its SNPN identity(ies).
Barred Cell:
A cell a UE is not allowed to camp on.
CAG cell:
A cell broadcasting at least one Closed Access Group Identifier.
Camped on a cell:
UE has completed the cell selection/reselection process and has chosen a cell. The UE monitors system information and (in most cases) paging information.
Camped on any cell:
UE is in idle mode and has completed the cell selection/reselection process and has chosen a cell irrespective of PLMN identity.
Closed Access Group Identifier:
Identifier of a CAG within a PLMN.
Commercial Mobile Alert System:
Public Warning System that delivers Warning Notifications provided by Warning Notification Providers to CMAS capable UEs.
eCall Only Mode:
A UE configuration option that allows the UE to register at 5GC and register in IMS to perform only eCall Over IMS, and a non-emergency IMS call for test and/or terminal reconfiguration services.
EHPLMN:
Any of the PLMN entries contained in the Equivalent HPLMN list TS 23.122.
Equivalent PLMN list:
List of PLMNs considered as equivalent by the UE for cell selection, cell reselection, and handover according to the information provided by the NAS.
Equivalent SNPN list:
List of SNPNs considered as equivalent by the UE for cell selection, cell reselection, and handover according to the information provided by the NAS.
eRedCap UE:
A UE with enhanced reduced capabilities as specified in clause 4.2.22 in TS 38.306.
Home PLMN:
A PLMN where the Mobile Country Code (MCC) and Mobile Network Code (MNC) of the PLMN identity are the same as the MCC and MNC of the IMSI.
HSDN cell:
A cell that has higher priority than other cells for cell reselection for HSDN capable UE in a High-mobility state.
Mobile-IAB cell:
As defined in TS 38.300.
Network Identifier:
Identifier of an SNPN in combination with a PLMN ID (TS 23.501).
Non-Public Network:
A network deployed for non-public use, as defined in TS 22.261.
Non-terrestrial network:
An NG-RAN consisting of gNBs, which provides 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 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 communication and, UE-to-UE Relay communication including 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.
Process:
A local action in the UE invoked by an RRC procedure or an RRC_IDLE or RRC_INACTIVE state procedure.
Quasi-earth fixed cell:
An NTN cell fixed with respect to a certain geographic area on the earth during a certain time duration. This can be provisioned by beam(s) covering one geographic area for a limited period and a different geographic area during another period (e.g., the case of NGSO satellites generating steerable beams).
Radio Access Technology:
Type of technology used for radio access, for instance NR or E-UTRA.
Ranging/Sidelink Positioning:
AS functionality enabling ranging-based services and sidelink positioning as defined in TS 23.586.
RedCap UE:
A UE with reduced capabilities as specified in clause 4.2.21 in TS 38.306.
Registration Area:
(NAS) registration area is an area in which the UE may roam without a need to perform location registration, which is a NAS procedure.
Registered PLMN:
This is the PLMN on which certain Location Registration outcomes have occurred, as specified in TS 23.122.
Registered SNPN:
This is the SNPN on which certain Location Registration outcomes have occurred, as specified in TS 23.122.
Reserved Cell:
A cell on which camping is not allowed, except for particular UEs, if so indicated in the system information.
Selected PLMN:
This is the PLMN that has been selected by the NAS, either manually or automatically.
Selected SNPN:
This is the SNPN that has been selected by the NAS, either manually or automatically.
Serving cell:
The cell on which the UE is camped.
Sidelink:
UE to UE interface for V2X sidelink communication defined in TS 23.287.
SNPN Access Mode:
Mode of operation wherein UE only selects SNPNs (as defined in TS 23.501).
SNPN identity:
An identifier of an SNPN comprising of a PLMN ID and an NID combination.
Strongest cell:
The cell on a particular frequency that is considered strongest according to the layer 1 cell search procedure (TS 38.213, TS 38.215).
Suitable Cell:
This is a cell on which a UE may camp. For NR cell, the criteria are defined in clause 4.5, for E-UTRA cell in TS 36.304.
U2N Relay UE:
a UE that provides functionality to support connectivity to the network for U2N Remote UE(s).
U2N Remote UE:
a UE that communicates with the network via a U2N Relay UE.
U2U Relay UE:
a UE that provides functionality to support connectivity for U2U Remote UE(s).
U2U Remote UE:
a UE that communicates with other UE(s) via a U2U Relay UE.
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. 9
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.
AS
Access Stratum
ATG
Air To Ground
CAG
Closed Access Group
CAG-ID
Closed Access Group Identifier
CMAS
Commercial Mobile Alert System
CN
Core Network
DCI
Downlink Control Information
DRX
Discontinuous Reception
DTX
Discontinuous Transmission
eDRX
Extended DRX
ETWS
Earthquake and Tsunami Warning System
E-UTRA
Evolved UMTS Terrestrial Radio Access
E-UTRAN
Evolved UMTS Terrestrial Radio Access Network
GIN
Group ID for Network selection
H-SFN
Hyper System Frame Number
HRNN
Human-Readable Network Name
HSDN
High Speed Dedicated Network
IAB
Integrated Access and Backhaul
IMSI
International Mobile Subscriber Identity
L2
Layer-2
MBS
Multicast/Broadcast Services
MBS FSAI
MBS Frequency Selection Area Identity
MCC
Mobile Country Code
MCCH
MBS Control Channel
MICO
Mobile Initiated Connection Only
MRB
MBS Radio Bearer
MTCH
MBS Traffic Channel
NAS
Non-Access Stratum
NCR
Network-Controlled Repeater
NCR-Fwd
NCR Forwarding
NCR-MT
NCR Mobile Termination
NES
Network Energy Savings
NID
Network Identifier
NPN
Non-Public Network
NR
NR Radio Access
NSAG
Network Slice AS Group
NTN
Non-Terrestrial Network
PEI
Paging Early Indication
PEI-O
Paging Early Indication-Occasion
PH
Paging Hyperframe
PLMN
Public Land Mobile Network
PTW
Paging Time Window
RAT
Radio Access Technology
RNA
RAN-based Notification Area
RNAU
RAN-based Notification Area Update
RRC
Radio Resource Control
SDT
Small Data Transmission
SL
Sidelink
SNPN
Stand-alone Non-Public Network
TN
Terrestrial Network
TRS
Tracking Reference Signal
U2N
UE-to-Network
U2U
UE-to-UE
UAC
Unified Access Control
UE
User Equipment
UMTS
Universal Mobile Telecommunications System
V2X
Vehicle to Everything
