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Content for  TS 38.304  Word version:  16.2.0

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1  ScopeWord‑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;
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2  References

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".
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3  Definitions, symbols and abbreviationsWord‑p. 7

3.1  Definitions

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).
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.
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.
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.
NR sidelink communication:
AS functionality enabling at least V2X Communication as defined in TS 23.287, 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.
Radio Access Technology:
Type of technology used for radio access, for instance NR or E-UTRA.
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.
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.
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3.2  AbbreviationsWord‑p. 8
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
CAG
Closed Access Group
CAG-ID
Closed Access Group Identifier
CMAS
Commercial Mobile Alert System
CN
Core Network
DCI
Downlink Control Information
ETWS
Earthquake and Tsunami Warning System
E-UTRA
Evolved UMTS Terrestrial Radio Access
E-UTRAN
Evolved UMTS Terrestrial Radio Access Network
HRNN
Human-Readable Network Name
IAB
Integrated Access and Backhaul
IMSI
International Mobile Subscriber Identity
MCC
Mobile Country Code
MICO
Mobile Initiated Connection Only
NAS
Non-Access Stratum
NID
Network Identifier
NPN
Non-Public Network
NR
NR Radio Access
PLMN
Public Land Mobile Network
RAT
Radio Access Technology
RNA
RAN-based Notification Area
RNAU
RAN-based Notification Area Update
RRC
Radio Resource Control
SNPN
Stand-alone Non-Public Network
UAC
Unified Access Control
UE
User Equipment
UMTS
Universal Mobile Telecommunications System
V2X
Vehicle to Everything
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