ETSI TS 123 122 V16.12.0 (2022-03)

Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; 5G; Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode (3GPP TS 23.122 version 16.12.0 Release 16)

RTS/TSGC-0123122vgc0

General Information

• Status: Not Published
• Technical Committee: 3GPP CT 1 - MM/CC/SM [lu] (formely CN1)
• Current Stage: 12 - Completion
• Completion Date: 30-Mar-2022

Standards Content (Sample)

TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
5G;
Non-Access-Stratum (NAS)
functions related to Mobile Station (MS) in idle mode
(3GPP TS 23.122 version 16.12.0 Release 16)

3GPP TS 23.122 version 16.12.0 Release 16 1 ETSI TS 123 122 V16.12.0 (2022-03)

Reference
RTS/TSGC-0123122vgc0
Keywords
5G,GSM,LTE,UMTS
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ETSI
3GPP TS 23.122 version 16.12.0 Release 16 2 ETSI TS 123 122 V16.12.0 (2022-03)
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
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DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its

Members. 3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and of the 3GPP
Organizational Partners. oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and of the ®
oneM2M Partners. GSM and the GSM logo are trademarks registered and owned by the GSM Association.
Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities. These shall be
interpreted as being references to the corresponding ETSI deliverables.
The cross reference between 3GPP and ETSI identities can be found under http://webapp.etsi.org/key/queryform.asp.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
3GPP TS 23.122 version 16.12.0 Release 16 3 ETSI TS 123 122 V16.12.0 (2022-03)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
1.1 References . 6
1.2 Definitions and abbreviations . 9
2 General description of idle mode . 14
3 Requirements and technical solutions . 15
3.0 General . 15
3.1 PLMN selection and roaming . 15
3.1A CSG selection / restriction . 18
3.1B PLMN selection triggered by ProSe direct communication . 19
3.1C PLMN selection triggered by V2X communication over PC5 . 21
3.2 Regional provision of service . 23
3.3 Borders between registration areas . 24
3.4 Access control . 24
3.4.1 Access control . 24
3.4.2 Forbidden LA or TA for regional provision of service . 25
3.5 No suitable cell (limited service state) . 25
3.6 CTS fixed part selection (A/Gb mode only) . 26
3.7 NAS behaviour configuration. 26
3.8 CAG selection (N1 mode only) . 26
3.9 SNPN selection . 27
4 Overall process structure . 27
4.1 Process goal . 27
4.2 States description . 27
4.3 List of states . 27
4.3.1 List of states for the PLMN selection process . 27
4.3.1.1 List of states for automatic mode (figure 2a) . 27
4.3.1.2 List of states for manual mode (figure 2b) . 28
4.3.2 Void . 28
4.3.3 List of states for location registration (figure 3) . 28
4.4 PLMN selection process . 29
4.4.1 Introduction. 29
4.4.2 Registration on a PLMN . 29
4.4.3 PLMN selection . 30
4.4.3.1 At switch-on or recovery from lack of coverage . 31
4.4.3.1.1 Automatic Network Selection Mode Procedure . 31
4.4.3.1.2 Manual Network Selection Mode Procedure . 34
4.4.3.1.3 Manual CSG selection . 36
4.4.3.1.3.1 General . 36
4.4.3.1.3.2 Manual CSG selection within the RPLMN . 37
4.4.3.1.3.3 Manual CSG selection in a PLMN different from the RPLMN . 37
4.4.3.2 User reselection . 38
4.4.3.2.1 Automatic Network Selection Mode . 38
4.4.3.2.2 Manual Network Selection Mode . 38
4.4.3.2.3 Manual CSG selection . 38
4.4.3.3 In VPLMN . 39
4.4.3.3.1 Automatic and manual network selection modes . 39
4.4.3.3.2 Manual CSG selection . 40
4.4.3.4 Investigation Scan for higher prioritized PLMN . 40
4.4.4 Abnormal cases . 41
4.4.5 Roaming not allowed in this LA or TA . 41
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4.4.6 Steering of roaming . 41
4.5 Location registration process . 41
4.5.1 General . 41
4.5.2 Initiation of Location Registration . 42
4.5.3 Periodic Location Registration . 44
4.5.4 IMSI attach/detach operation . 44
4.5.5 No Suitable Cells In Location Area . 45
4.6 Service indication (A/Gb mode only) . 45
4.7 Pageability of the mobile subscriber . 45
4.8 MM Restart Procedure . 45
4.9 SNPN selection process . 46
4.9.1 General . 46
4.9.2 Registration on an SNPN . 46
4.9.3 SNPN selection . 46
4.9.3.0 General . 46
4.9.3.1 At switch-on or recovery from lack of coverage . 49
4.9.3.1.0 General . 49
4.9.3.1.1 Automatic SNPN selection mode procedure . 49
4.9.3.1.2 Manual SNPN selection mode procedure . 49
4.9.3.2 User reselection . 50
4.9.3.2.0 General . 50
4.9.3.2.1 Automatic SNPN selection mode . 50
4.9.3.2.2 Manual SNPN selection mode procedure . 50
4.9.4 Abnormal cases . 50
5 Tables and Figures . 51
6 MS supporting access technologies defined both by 3GPP and 3GPP2 . 57
6.1 General . 57
Annex A (normative): HPLMN Matching Criteria . 59
Annex B (normative): PLMN matching criteria to be of same country as VPLMN . 63
Annex C (normative): Control plane solution for steering of roaming in 5GS . 64
C.0 Requirements for 5G steering of roaming over the control plane . 64
C.1 General . 64
C.2 Stage-2 flow for steering of UE in VPLMN during registration . 65
C.3 Stage-2 flow for steering of UE in HPLMN or VPLMN after registration . 70
Annex D (informative): Change history . 74
History . 84

ETSI
3GPP TS 23.122 version 16.12.0 Release 16 5 ETSI TS 123 122 V16.12.0 (2022-03)
Foreword
rd
This Technical Specification (TS) has been produced by the 3 Generation Partnership Project (3GPP).
The present document specifies functions related to Mobile Station (MS) in idle mode and within the 3GPP system.
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
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3GPP TS 23.122 version 16.12.0 Release 16 6 ETSI TS 123 122 V16.12.0 (2022-03)
1 Scope
The present document gives an overview of the tasks undertaken by the Core network protocols of a Mobile Station
(MS) when in idle mode, that is, switched on but typically not having a dedicated channel allocated. It also describes the
corresponding network functions. The idle mode functions are also performed by a GPRS MS as long as no dedicated
channel is allocated to the MS. The conditions when the idle mode functions are performed by an MS in the UTRA
RRC connected mode states are specified in 3GPP TS 25.331 [33]. The conditions when the idle mode functions are
performed by an MS in the E-UTRAN are specified in 3GPP TS 36.304 [43]. The conditions when the idle mode
functions are performed by an MS in the NG-RAN are specified in 3GPP TS 36.304 [43] and 3GPP TS 38.304 [61].
The conditions when the idle mode functions are performed by an MS in the NG-RAN RRC inactive state are specified
in 3GPP TS 36.331 [42] and 3GPP TS 38.331 [65].
The present document defines the PLMN selection for a multi mode MS that supports both 3GPP and 3GPP2 systems.
The common PLMN selection logic covers also PLMNs that are available in 3GPP2 system, but the present document ®
makes no changes on the cdma2000 signalling towards networks that are available via 3GPP2 system.
The present document gives procedures for using the CSG cells, whenever such use is permitted.
The present document gives procedures for using the CAG cells, when the MS supports CAG.
The present document specifies the SNPN selection.
This 3GPP TS outlines how the requirements of the 22 series Technical Specifications (especially 3GPP TS 22.011 [9])
on idle mode operation shall be implemented. Further details are given in 3GPP TS 24.008 [23].
Clause 2 of this 3GPP TS gives a general description of the idle mode process. Clause 3 outlines the main requirements
and technical solutions of those requirements. Clause 4 describes the processes used in idle mode. There is inevitably
some overlap between these clauses. ®
NOTE: cdma2000 is a registered trademark of the Telecommunications Industry Association (TIA-USA).
The present document describes the procedures for control plane solution of steering of roaming in 5GS in annex C.
Annex C is applicable to the MS, the AMF, the UDM and the SOR-AF in the 5GS.
The present document does not consider GERAN Iu mode.
1.1 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] Void.
[2] Void.
[3] Void.
[4] Void.
[5] Void.
[6] Void.
[7] Void
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[8] Void.
[9] 3GPP TS 22.011: "Service accessibility".
[10] Void.
[11] Void.
[12] Void.
[13] Void.
[14] Void.
[15] Void.
[16] Void.
[17] Void.
[18] Void.
[19] Void.
[20] Void.
[21] Void.
[22] Void.
[22A] 3GPP TS 23.003: "Numbering, addressing and identification".
[23] 3GPP TS 24.008: "Mobile Radio Interface Layer 3 specification, Core Network Protocols -
Stage 3".
[23A] 3GPP TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS);
Stage 3".
[24] 3GPP TS 45.002: "Multiplexing and multiple access on the radio path".
[25] 3GPP TS 45.008: "Radio subsystem link control".
[26] Void.
[27] 3GPP TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
[27A] 3GPP TS 23.682: "Architecture enhancements to facilitate communications with packet data
networks and applications".
[28] Void.
[29] Void.
[30] Void.
[31] Void.
[32] 3GPP TS 25.304: "UE Procedures in Idle Mode and Procedures for Cell Reselection in Connected
Mode".
[33] 3GPP TS 25.331: "RRC Protocol Specification".
[34] 3GPP TS 44.018:"Mobile radio interface layer 3 specification, Radio Resource Control Protocol".
[35] 3GPP TS 43.022: "Functions related to Mobile Station (MS) in idle mode and group receive
mode".
[35A] 3GPP TS 43.318: "Generic Access Network (GAN); Stage 2".
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3GPP TS 23.122 version 16.12.0 Release 16 8 ETSI TS 123 122 V16.12.0 (2022-03)
[35B] 3GPP TS 44.318: "Generic Access Network (GAN); Mobile GAN interface layer 3 specification;
Stage 3".
[36] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[37] Void.
[38] 3GPP TS 21.111: "USIM and IC card requirements".
[39] 3GPP TS 44.060: "General Packet Radio Service (GPRS);Mobile Station (MS) - Base Station
System (BSS) interface;Radio Link Control/Medium Access Control (RLC/MAC) protocol".
[40] 3GPP TS 31.102: "Characteristics of the USIM Application".
[41] 3GPP TS 31.111: "Universal Subscriber Identity Module (USIM), Application Toolkit (USAT)".
[42] 3GPP TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA) Radio Resource
Control (RRC); Protocol specification".
[43] 3GPP TS 36.304: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE)
procedures in idle mode".
[44] 3GPP2 C.S0016-D v1.0: "Over-the-Air Service Provisioning of Mobile Stations in Spread
Spectrum Standards".
[45] 3GPP2 C.S0011-C v2.0: "Recommended Minimum Performance Standards for cdma2000 Spread
Spectrum Mobile Stations".
[46] 3GPP2 C.S0033-A v2.0: "Recommended Minimum Performance Standards for cdma2000 High
Rate Packet Data Access Terminal".
[47] 3GPP TS 24.285: "Allowed Closed Subscriber Group (CSG) List Management Object (MO)".
[48] Void.
[49] 3GPP TS 22.220: "Service requirements for Home Node B (HNB) and Home eNode B (HeNB)".
[50] 3GPP TS 24.368: "Non-Access Stratum (NAS) configuration Management Object (MO)".
[51] 3GPP TS 24.334: "Proximity-services (ProSe) User Equipment (UE) to Proximity-services
(ProSe) Function Protocol aspects; Stage 3".
[52] 3GPP TS 24.333: "Proximity-services (ProSe) Management Objects (MO)".
[53] 3GPP TS 24.105: "Application specific Congestion control for Data Communication (ACDC)
Management Object (MO)".
[54] 3GPP TS 36.306: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE)
radio access capabilities".
[55] 3GPP TS 43.064: "Overall description of the GPRS Radio Interface; Stage 2".
[56] 3GPP TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal
Terrestrial Radio Access Network (E-UTRAN); Overall description".
[57] 3GPP TS 23.167: "IP Multimedia Subsystem (IMS) emergency sessions".
[58] 3GPP TS 23.401: "GPRS enhancements for E-UTRAN access".
[59] 3GPP TS 24.386: "User Equipment (UE) to V2X control function; protocol aspects; Stage 3".
[60] 3GPP TS 24.385: "V2X services Management Object (MO)".
[61] 3GPP TS 38.304: "New Generation Radio Access Network; User Equipment (UE) procedures in
Idle mode".
[62] 3GPP TS 23.501: "System Architecture for the 5G System; Stage 2".
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[63] 3GPP TS 23.502: "Procedures for the 5G System; Stage 2".
[64] 3GPP TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
[65] 3GPP TS 38.331: "NR; Radio Resource Control (RRC) protocol specification".
[66] 3GPP TS 33.501: "Security architecture and procedures for 5G System".
[67] 3GPP TS 31.115: "Secured packet structure for (Universal) Subscriber Identity Module (U)SIM
Toolkit applications".
[68] 3GPP TS 23.246: "Multimedia Broadcast/Multicast Service (MBMS); Architecture and Functional
Description".
[69] 3GPP TS 23.221: "Architectural requirements".
[70] 3GPP TS 23.273: "5G System (5GS) Location Services (LCS)".
[71] 3GPP TS 29.544: "5G System (5GS); Secured Packet Application Function (SP-AF) services;
Stage 3".
[72] 3GPP TS 29.571: "5G System (5GS); Common Data Types for Service Based Interfaces; Stage 3".
[73] ETSI TS 102 225: "Smart Cards; Secured packet structure for UICC based applications".
[74] Void
[75] 3GPP TS 24.587: " Vehicle-to-Everything (V2X) services in 5G System (5GS); Stage 3".
[76] Void
[77] Void
[78] Void
[79] 3GPP TS 24.588: "Vehicle-to-Everything (V2X) services in 5G System (5GS); User Equipment
(UE) policies; Stage 3".
1.2 Definitions and abbreviations
For the purposes of the present document, the abbreviations defined in 3GPP TR 21.905 [36] apply.
(A/Gb mode only): Indicates this clause applies only to a GSM system which operates in A/Gb mode. For multi system
case this is determined by the current serving radio access network.
(Iu mode only): Indicates this clause applies only to UMTS. For multi system case this is determined by the current
serving radio access network.
NOTE 1: In accordance with the description of packet services in Iu mode in 3GPPS TS 24.008 [23], the terms
'CS/PS mode of operation' and 'PS mode of operation' are not used in the present document. Instead the
terms 'MS operation mode A' and 'MS operation mode C' are used.
(S1 mode only): Indicates this clause applies only to an EPS. For multi system case this is determined by the current
serving radio access network.
Acceptable Cell: This is a cell that the MS may camp on to make emergency calls or to access RLOS. It must satisfy
criteria which are defined for A/Gb mode in 3GPP TS 43.022 [35], for Iu mode in 3GPP TS 25.304 [32], for S1 mode in
3GPP TS 36.304 [43], and for NR access in N1 mode in 3GPP TS 38.304 [61] and for E-UTRA access in N1 mode in
3GPP TS 36.304 [43]. For an MS in eCall only mode, an acceptable cell must further satisfy the criteria defined in
clause 4.4.3.1.1.
Access Technology: The access technology associated with a PLMN or SNPN. The MS uses this information to
determine what type(s) of radio carrier to search for when attempting to select a specific PLMN or SNPN (e.g., GSM,
UTRAN, GSM COMPACT, E-UTRAN or NG-RAN). A PLMN may support more than one access technology. SNPNs
only support NG-RAN.
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NOTE 2: Access technology "E-UTRAN" maps to core network type "EPC" and access technology "NG-RAN"
maps to core network type "5GCN", see 3GPP TS 24.501 [64].
ACDC: Application specific Congestion control for Data Communication, see 3GPP TS 22.011 [9].
Allowable PLMN: In the case of an MS operating in MS operation mode A or B, this is a PLMN which is not in the
list of "forbidden PLMNs" in the MS. In the case of an MS operating in MS operation mode C or an MS not supporting
A/Gb mode and not supporting Iu mode, this is a PLMN which is not in the list of "forbidden PLMNs" and not in the
list of "forbidden PLMNs for GPRS service" in the MS.
Allowable SNPN: In the case of an MS operating in SNPN access mode, this is an SNPN which is not in the list of
"permanently forbidden SNPNs" and is not in the list of "temporarily forbidden SNPNs".
Allowable PLMN/access technology combination: For an MS operating in MS operation mode C or an MS not
supporting A/Gb mode and not supporting Iu mode, this is an allowable PLMN in any specific access technology. For
an MS operating in MS operation mode A or B, this is a PLMN/access technology combination where:
- the PLMN is an allowable PLMN and the specific access technology is supporting non-GPRS services; or
- the PLMN is not in the list of "forbidden PLMNs" and not in the list of "forbidden PLMNs for GPRS service" in
the MS and the specific access technology is only supporting GPRS services.
EXAMPLE: E-UTRAN and NG-RAN are access technologies that are only supporting GPRS services.
Available PLMN: For GERAN A/Gb mode see 3GPP TS 43.022 [35]. For UTRAN see 3GPP TS 25.304 [32]. For E- ®
UTRAN see 3GPP TS 36.304 [43]. For NG-RAN see 3GPP TS 36.304 [43] and 3GPP TS 38.304 [61]. For cdma2000 ®
1xRTT and cdma2000 HRPD see 3GPP2 C.S0016 [44].
Available SNPN: For NG-RAN see 3GPP TS 38.304 [61].
Available PLMN/access technology combination: This is an available PLMN in a specific access technology.
Camped on a cell: The MS (ME if there is no SIM) has completed the cell selection/reselection process and has chosen
a cell from which it plans to receive all available services. Note that the services may be limited, and that the PLMN or
the SNPN may not be aware of the existence of the MS (ME) within the chosen cell.
Country: A country is identified by a single MCC value, with the exception that MCC values 310 through 316 identify
a single country (USA), MCC values 404 through 406 identify a single country (India), and MCC values 440 and 441
identify a single country (Japan).
CSG whitelist: See 3GPP TS 36.304 [43].
Current serving cell: This is the cell on which the MS is camped.
CTS MS: An MS capable of CTS services is a CTS MS.
EAB: Extended Access Barring, see 3GPP TS 22.011 [9].
Extended Coverage in GSM for Internet of Things (EC-GSM-IoT): Extended coverage in GSM for IoT is a feature
which enables extended coverage operation. See 3GPP TS 43.064 [55].
EHPLMN: Any of the PLMN entries contained in the Equivalent HPLMN list.
Equivalent HPLMN list: To allow provision for multiple HPLMN codes, PLMN codes that are present within this list
shall replace the HPLMN code derived from the IMSI for PLMN selection purposes. This list is stored on the USIM
and is known as the EHPLMN list. The EHPLMN list may also contain the HPLMN code derived from the IMSI. If the
HPLMN code derived from the IMSI is not present in the EHPLMN list then it shall be treated as a Visited PLMN for
PLMN selection purposes.
Generic Access Network (GAN): See 3GPP TS 43.318 [35A].
GAN mode: See 3GPP TS 43.318 [35A].
GPRS MS: An MS capable of GPRS services is a GPRS MS.
MS operation mode: See 3GPP TS 23.060 [27].
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3GPP TS 23.122 version 16.12.0 Release 16 11 ETSI TS 123 122 V16.12.0 (2022-03)
High quality signal: The high quality signal limit is used in the PLMN selection procedure. It is defined in the
appropriate AS specification: 3GPP TS 43.022 [35] for the GSM radio access technology, 3GPP TS 25.304 [32] for the
UMTS radio access technology (FDD or TDD mode), 3GPP TS 36.304 [43] for the E-UTRAN radio access technology
(WB-S1 mode, NB-S1 mode, WB-N1 mode or NB-N1 mode), 3GPP TS 36.304 [43] and and 3GPP TS 38.304 [61] for
the NG-RAN radio access technology. For 3GPP2 access technologies the high quality signal limit is defined in
® ®
3GPP2 C.S0011 [45] for cdma2000 1xRTT and in 3GPP2 C.S0033 [46] for cdma2000 HRPD. A mobile station
attempting to find a cell that supports EC-GSM-IoT (see 3GPP TS 43.064 [55]) does not use high quality signal limit in
the PLMN selection procedure, i.e. for the purpose of PLMN selection, when attempting to find a cell that supports EC-
GSM-IoT, any found cell supporting EC-GSM-IoT is considered to be received with high quality signal. A UE
attempting to find a cell that supports enhanced coverage when operating in any WB-S1 or WB-N1 enhanced coverage
mode does not use high quality signal limit in the PLMN selection procedure, i.e. for the purpose of PLMN selection,
when attempting to find a cell that supports enhanced coverage, any found cell supporting enhanced coverage and
satisfying the coverage specific quality signal limit defined for CE mode (see 3GPP TS 36.304 [43]) is considered to be
received with high quality signal.
Home PLMN: This is a PLMN where the MCC and MNC of the PLMN identity match the MCC and MNC of the
IMSI. Matching criteria are defined in Annex A.
In A/Gb mode,.: Indicates this clause applies only to a GSM system which operates in A/Gb mode. For multi system
case this is determined by the current serving radio access network.
In Iu mode,.: Indicates this clause applies only to UMTS. For multi system case this is determined by the current
serving radio access network.
In N1 mode,.: Indicates this clause applies only to an 5GS. For multi system case this is determined by the current
serving radio access network.
In NB-N1 mode: Indicates this paragraph applies only to a system which operates in NB-N1 mode. For a multi-access
system this case applies if the current serving radio access network provides access to 5G network services via E-UTRA
connected to 5GCN by NB-IoT (see 3GPP TS 36.300 [56], 3GPP TS 36.331 [22], 3GPP TS 36.306 [54]).
In WB-N1 mode: Indicates this paragraph applies only to a system which operates in WB-N1 mode. For a multi-access
system this case applies if the system operates in N1 mode with E-UTRA connected to 5GCN, but not in NB-N1 mode.
In S1 mode,.: Indicates this clause applies only to an EPS. The S1 mode includes WB-S1 mode and NB-S1 mode. For
multi system case this is determined by the current serving radio access network.
In NB-S1 mode: Indicates this paragraph applies only to a system which operates in NB-S1 mode. For a multi-access
system this case applies if the current serving radio access network provides access to network services via E-UTRA by
NB-IoT (see 3GPP TS 36.300 [56], 3GPP TS 36.331 [22], 3GPP TS 36.306 [54]).
In WB-S1 mode: Indicates this paragraph applies only to a system which operates in WB-S1 mode. For a multi-access
system this case applies if the system operates in S1 mode, but not in NB-S1 mode.
Limited Service State: See clause 3.5.
Localised Service Area (LSA): A localised service area consists of a cell or a number of cells. The cells constituting a
LSA may not necessarily provide contiguous coverage.
Location Registration (LR): An MS which is IMSI attached to non-GPRS services only performs location registration
by the Location Updating procedure. A GPRS MS which is IMSI attached to GPRS services or to GPRS and non-GPRS
services performs location registration by the Routing Area Update procedure only when in a network of network
operation mode I. Both location updating and routing area update procedures are performed independently by the GPRS
MS when it is IMSI attached to GPRS and non-GPRS services in a network of network operation mode II (see
3GPP TS 23.060 [27]). An MS which is attached via the E-UTRAN performs location registration by the tracking area
update procedure. An MS which is registered via the NG-RAN performs location registration by the mobility
registration update procedure.
MS: Mobile Station. The present document makes no distinction between MS and UE.
N1 mode capability: Capability of the UE associated with an N1 NAS signalling connection between the UE and
network. The present document refers to the N1 mode capability over 3GPP access only (see 3GPP TS 24.501 [64]).
ETSI
3GPP TS 23.122 version 16.12.0 Release 16 12 ETSI TS 123 122 V16.12.0 (2022-03)
NarrowBand Internet of Things (NB-IoT): NB-IoT is a non-backward compatible variant of E-UTRAN supporting a
reduced set of functionality. NB-IoT allows access to EPC or 5GCN network services via E-UTRA with a channel
bandwidth limited to 180 kHz (see 3GPP TS 36.300 [20], 3GPP TS 36.331 [42], 3GPP TS 36.306 [44]).
Network Type: The network type associated with HPLMN or a PLMN on the PLMN selector (see
3GPP TS 31.102 [40]). The MS uses this information to determine what type of radio carrier to search for when
attempting to select a specific PLMN. A PLMN may support more than one network type.
Registered PLMN (RPLMN): This is the PLMN on which certain LR outcomes have occurred (see table 1). In a
shared network the RPLMN is the PLMN defined by the PLMN identity of the CN operator that has accepted the LR.
Registered SNPN (RSNPN): This is the SNPN on which certain LR outcomes have occurred. In a shared network the
RSNPN is the SNPN defined by the SNPN identity of the CN operator that has accepted the LR.
Registration: This is the process of camping on a cell of the PLMN or the SNPN and doing any necessary LRs.
Registration Area: A registration area is an area in which mobile stations may roam without a need to perform location
registration. The registration area corresponds to location area (LA) for performing location updating procedure, to
routing area for performing the GPRS attach or routing area update procedures, and to a list of tracking areas (TAs) for
performing the EPS attach, tracking area update, or 5GS registration procedure.
The PLMN to which a cell belongs (PLMN identity):
- for GERAN, in the system information (MCC + MNC part of LAI) broadcast as specified in
3GPP TS 44.018 [34];
- for UTRA, see the broadcast information as specified in 3GPP TS 25.331 [33];
- for E-UTRA, see the broadcast information as specified in 3GPP TS 36.331 [42]; and
- for NR, see the broadcast information as specified in 3GPP TS 38.331 [65].
The SNPN to which a cell belongs (SNPN identity):
- for NR, see the broadcast information as specified in 3GPP TS 38.331 [65].
In a shared network, a cell belongs to all PLMNs given in the system information broadcasted as specified in
3GPP TS 44.018 [34] for GERAN, in 3GPP TS 25.331 [33] for UTRAN, and in 3GPP TS 36.331 [42] for E-UTRAN,
and a cell belongs to all PLMNs, all SNPNs, or all PLMNs and all SNPNs, given in the system information broadcasted
as specified in 3GPP TS 36.331 [42] for E-UTRA connected to 5GCN, and in 3GPP TS 38.331 [65] for NR.
Secured packet: In this specification, a secured packet contains the list of preferred PLMN/access technology
combinations encapsulated with a security mechanism as described in 3GPP TS 31.115 [67].
Selected PLMN: This is the PLMN that has been selected according to clause 3.1, either manually or automatically.
Selected SNPN: This is the SNPN that has been selected according to clause 3.9, either manually or automatically.
Shared Network: An MS considers a cell to be part of a shared network, when multiple PLMN identities are received
as specified in 3GPP TS 44.018 [34] for GERAN, in 3GPP TS 25.331 [33] for UTRAN, and in 3GPP TS 36.331 [42]
for E-UTRAN, and when multiple PLMN identities, multiple SNPN identities or one or more PLMN identities and one
or more SNPN identities are received as specified in 3GPP TS 36.331 [42] for E-UTRA connected to 5GCN, and in
3GPP TS 38.331 [65] for NR.
SIM: Subscriber Identity Module (see 3GPP TS 21.111 [38]). The present document makes no distinction between SIM
and USIM.
SNPN identity: a PLMN ID and an NID combination.
SoLSA exclusive access: Cells on which normal camping is allowed only for MS with Localised Service Area (LSA)
subscription.
Suitable Cell: This is a
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