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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
Non-Access-Stratum (NAS) functions related to
Mobile Station (MS) in idle mode
(3GPP TS 23.122 version 15.6.0 Release 15)
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3GPP TS 23.122 version 15.6.0 Release 15 1 ETSI TS 123 122 V15.6.0 (2019-03)
Reference
RTS/TSGC-0123122vf60
Keywords
GSM,LTE,UMTS
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© ETSI 2019.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
TM TM
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.
ETSI
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3GPP TS 23.122 version 15.6.0 Release 15 2 ETSI TS 123 122 V15.6.0 (2019-03)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
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, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
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
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3GPP TS 23.122 version 15.6.0 Release 15 3 ETSI TS 123 122 V15.6.0 (2019-03)
Contents
Intellectual Property Rights . 2
Foreword . 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 . 12
3 Requirements and technical solutions . 13
3.1 PLMN selection and roaming . 13
3.1A CSG selection / restriction . 16
3.1B PLMN selection triggered by ProSe direct communication . 17
3.1C PLMN selection triggered by V2X communication over PC5 . 19
3.2 Regional provision of service . 21
3.3 Borders between registration areas . 21
3.4 Access control . 21
3.4.1 Access control . 21
3.4.2 Forbidden LA or TA for regional provision of service . 22
3.5 No suitable cell (limited service state) . 22
3.6 CTS fixed part selection (A/Gb mode only) . 23
3.7 NAS behaviour configuration. 23
4 Overall process structure . 23
4.1 Process goal . 23
4.2 States description . 23
4.3 List of states . 24
4.3.1 List of states for the PLMN selection process . 24
4.3.1.1 List of states for automatic mode (figure 2a) . 24
4.3.1.2 List of states for manual mode (figure 2b) . 24
4.3.2 Void . 24
4.3.3 List of states for location registration (figure 3) . 24
4.4 PLMN selection process . 25
4.4.1 Introduction. 25
4.4.2 Registration on a PLMN . 25
4.4.3 PLMN selection . 26
4.4.3.1 At switch-on or recovery from lack of coverage . 27
4.4.3.1.1 Automatic Network Selection Mode Procedure . 27
4.4.3.1.2 Manual Network Selection Mode Procedure . 29
4.4.3.1.3 Manual CSG selection . 30
4.4.3.1.3.1 General . 30
4.4.3.1.3.2 Manual CSG selection within the RPLMN . 31
4.4.3.1.3.3 Manual CSG selection in a PLMN different from the RPLMN . 31
4.4.3.2 User reselection . 31
4.4.3.2.1 Automatic Network Selection Mode . 31
4.4.3.2.2 Manual Network Selection Mode . 32
4.4.3.2.3 Manual CSG selection . 32
4.4.3.3 In VPLMN . 32
4.4.3.3.1 Automatic and manual network selection modes . 32
4.4.3.3.2 Manual CSG selection . 33
4.4.3.4 Investigation Scan for higher prioritized PLMN . 34
4.4.4 Abnormal cases . 34
4.4.5 Roaming not allowed in this LA or TA . 34
4.4.6 Steering of roaming . 34
4.5 Location registration process . 35
4.5.1 General . 35
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3GPP TS 23.122 version 15.6.0 Release 15 4 ETSI TS 123 122 V15.6.0 (2019-03)
4.5.2 Initiation of Location Registration . 35
4.5.3 Periodic Location Registration . 37
4.5.4 IMSI attach/detach operation . 37
4.5.5 No Suitable Cells In Location Area . 37
4.6 Service indication (A/Gb mode only) . 38
4.7 Pageability of the mobile subscriber . 38
4.8 MM Restart Procedure . 38
5 Tables and Figures . 39
6 MS supporting access technologies defined both by 3GPP and 3GPP2 . 45
6.1 General . 45
Annex A (normative): HPLMN Matching Criteria . 47
Annex B (normative): PLMN matching criteria to be of same country as VPLMN . 51
Annex C (normative): Control plane solution for steering of roaming in 5GS . 52
C.0 Requirements for 5G steering of roaming over the control plane . 52
C.1 General . 52
C.2 Stage-2 flow for steering of UE in VPLMN during registration . 53
C.3 Stage-2 flow for steering of UE in VPLMN after registration . 55
Annex D (informative): Change history . 57
History . 64
ETSI
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3GPP TS 23.122 version 15.6.0 Release 15 5 ETSI TS 123 122 V15.6.0 (2019-03)
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.
ETSI
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3GPP TS 23.122 version 15.6.0 Release 15 6 ETSI TS 123 122 V15.6.0 (2019-03)
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 38.304 [61].
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.
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 and the UDM 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
[8] Void.
[9] 3GPP TS 22.011: "Service accessibility".
[10] Void.
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3GPP TS 23.122 version 15.6.0 Release 15 7 ETSI TS 123 122 V15.6.0 (2019-03)
[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".
[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".
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3GPP TS 23.122 version 15.6.0 Release 15 8 ETSI TS 123 122 V15.6.0 (2019-03)
[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".
[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".
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3GPP TS 23.122 version 15.6.0 Release 15 9 ETSI TS 123 122 V15.6.0 (2019-03)
[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"
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. 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 N1 mode in 3GPP TS 38.304 [61]. For an MS in eCall only mode, an acceptable cell
must further satisfy the criteria defined in subclause 4.4.3.1.1.
Access Technology: The access technology associated with a PLMN. The MS uses this information to determine what
type(s) of radio carrier to search for when attempting to select a specific PLMN (e.g., GSM, UTRAN, GSM
COMPACT, E-UTRAN or NG-RAN). A PLMN may support more than one access technology.
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 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 38.304 [61]. For cdma2000 1xRTT and cdma2000
HRPD see 3GPP2 C.S0016 [44].
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
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) and MCC values 404 through 406 identify a single country (India).
CSG whitelist: See 3GPP TS 36.304 [43].
Current serving cell: This is the cell on which the MS is camped.
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3GPP TS 23.122 version 15.6.0 Release 15 10 ETSI TS 123 122 V15.6.0 (2019-03)
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
...