Content for  TS 38.304  Word version:  17.6.0

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1  Scopep. 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  Referencesp. 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.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 38.300: "NR Overall Description; Stage 2".
TS 38.331: "NR; Radio Resource Control (RRC) - Protocol Specification".
TS 38.213: "NR; Physical layer procedures for control ".
[5]  Void
TS 36.331: "E-UTRA; Radio Resource Control (RRC) - Protocol Specification".
TS 36.304: "E-UTRA; User Equipment (UE) procedures in RRC_IDLE state ".
TS 38.133: "NR; Requirements for Support of Radio Resource Management".
TS 23.122: "NAS functions related to Mobile Station (MS) in RRC_IDLE state".
TS 23.501: "System Architecture for the 5G System; Stage 2".
TS 38.215: "NR; Physical layer measurements".
TS 22.261: "Service requirements for the 5G system".
TS 24.890: "5G System - Phase 1; CT WG1 Aspects".
TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
TS 38.101-1: "NR; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone".
TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services".
TS 23.285: "Technical Specification Group Services and System Aspects; Architecture enhancements for V2X services".
TS 22.011: "Service accessibility".
TS 38.321: "NR; Medium Access Control (MAC); Protocol specification".
TS 26.346: "Multimedia Broadcast/Multicast Service (MBMS); Protocols and codecs".
TS 23.247: "Architectural enhancements for 5G multicast-broadcast services; Stage 2".
TS 23.304: "Proximity based Services (ProSe) in 5G Systems (5GS)".
TS 23.003: "Numbering, addressing and identification".
TS 38.306: "User Equipment (UE) radio access capabilities".

3  Definitions, symbols and abbreviationsp. 7

3.1  Definitionsp. 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.
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.
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.
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 and UE-to-Network Relay communication) 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 and ProSe UE-to-Network 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.
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.
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.
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.
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  Abbreviationsp. 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.
Access Stratum
Closed Access Group
Closed Access Group Identifier
Commercial Mobile Alert System
Core Network
Downlink Control Information
Discontinuous Reception
Extended DRX
Earthquake and Tsunami Warning System
Evolved UMTS Terrestrial Radio Access
Evolved UMTS Terrestrial Radio Access Network
Group ID for Network selection
Hyper System Frame Number
Human-Readable Network Name
High Speed Dedicated Network
Integrated Access and Backhaul
International Mobile Subscriber Identity
Multicast/Broadcast Services
MBS Frequency Selection Area Identity
Mobile Country Code
MBS Control Channel
Mobile Initiated Connection Only
MBS Radio Bearer
MBS Traffic Channel
Non-Access Stratum
Network Identifier
Non-Public Network
NR Radio Access
Network Slice AS Group
Non-Terrestrial Network
Paging Early Indication
Paging Early Indication-Occasion
Paging Hyperframe
Public Land Mobile Network
Paging Time Window
Radio Access Technology
RAN-based Notification Area
RAN-based Notification Area Update
Radio Resource Control
Small Data Transmission
Stand-alone Non-Public Network
Tracking Reference Signal
Unified Access Control
User Equipment
Universal Mobile Telecommunications System
Vehicle to Everything

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