2 References

24.0083GPPCore network protocolsMobile radio interface Layer 3 specificationRelease 18Stage 3TS

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.

[2a] 3GPP TR 21.905 "Vocabulary for 3GPP Specifications"

[3] 3GPP TS 22.002: "Circuit Bearer Services (BS) supported by a Public Land Mobile Network (PLMN)".

[4] 3GPP TS 22.003: "Teleservices supported by a Public Land Mobile Network (PLMN)".

[5] 3GPP TS 42.009, Release 4: "Security aspects".

[5a] 3GPP TS 33.102: "3G security; Security architecture".

[6] Void.

[7] 3GPP TS 42.017, Release 4: "Subscriber Identity Modules (SIM); Functional characteristics".

[8] 3GPP TS 22.101: "Service aspects; Service principles".

[8a] 3GPP TS 22.001: "Principles of circuit telecommunication services supported by a Public Land Mobile Network (PLMN)".

[8b] 3GPP TS 23.038: "Alphabets and language-specific information".

[9] Void.

[9a] 3GPP TS 23.108: "Mobile radio interface layer 3 specification core network protocols; Stage 2 (structured procedures)".

[10] 3GPP TS 23.003: "Numbering, addressing and identification".

[11] Void.

[12] 3GPP TS 23.014: "Support of Dual Tone Multi-Frequency (DTMF) signalling".

[12a] ETSI ES 201 235-2, v1.2.1: "Specification of Dual Tone Multi-Frequency (DTMF); Transmitters and Receivers; Part 2: Transmitters".

[13] 3GPP TS 43.020: "Security-related network functions".

[14] 3GPP TS 23.122: "Non-Access-Stratum functions related to Mobile Station (MS) in idle mode".

[15] 3GPP TS 24.002: "GSM-UMTS Public Land Mobile Network (PLMN) access reference configuration".

[16] 3GPP TS 44.003: "Mobile Station – Base Station System (MS – BSS) interface; Channel structures and access capabilities".

[17] Void.

[18] 3GPP TS 44.005: "Data Link (DL) layer; General aspects".

[19] 3GPP TS 44.006: "Mobile Station – Base Station System (MS – BSS) interface; Data Link (DL) layer specification".

[19a] 3GPP TS 25.321: "Medium Access Control (MAC) protocol specification".

[19b] 3GPP TS 25.322: "Radio Link Control (RLC) protocol specification".

[19c] 3GPP TS 25.413: "UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling".

[20] 3GPP TS 24.007: "Mobile radio interface signalling layer 3; General aspects".

[21] 3GPP TS 24.010: "Mobile radio interface layer 3; Supplementary services specification; General aspects".

[22] 3GPP TS 24.011: "Point-to-Point (PP) Short Message Service (SMS) support on mobile radio interface".

[23] 3GPP TS 24.012: "Short Message Service Cell Broadcast (SMSCB) support on the mobile radio interface".

[23a] 3GPP TS 44.071: "Location Services (LCS); Mobile radio interface layer 3 specification."

[23b] 3GPP TS 44.031 "Location Services LCS); Mobile Station (MS) – Serving Mobile Location Centre (SMLC); Radio Resource LCS Protocol (RRLP)".

[23c] 3GPP TS 25.331: "Radio Resource Control (RRC) protocol specification"

[24] 3GPP TS 24.080: "Mobile radio Layer 3 supplementary service specification; Formats and coding".

[25] 3GPP TS 24.081: "Line identification supplementary services; Stage 3".

[26] Void.

[27] 3GPP TS 24.083: "Call Waiting (CW) and Call Hold (HOLD) supplementary services; Stage 3".

[28] 3GPP TS 24.084: "MultiParty (MPTY) supplementary services; Stage 3".

[29] Void.

[30] Void.

[31] Void.

[32] 3GPP TS 45.002: "Multiplexing and multiple access on the radio path".

[33] 3GPP TS 45.005: "Radio transmission and reception".

[34] 3GPP TS 45.008: "Radio subsystem link control".

[35] Void.

[36] 3GPP TS 27.001: "General on Terminal Adaptation Functions (TAF) for Mobile Stations (MS)".

[36a] 3GPP TS 27.060: "Mobile Station (MS) supporting Packet Switched Services ".

[37] 3GPP TS 29.002: "Mobile Application Part (MAP) specification".

[38] 3GPP TS 29.007: "General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)".

[39] 3GPP TS 51.010: "Mobile Station (MS) conformance specification".

[40] Void.

[41] ISO/IEC 646 (1991): "Information technology – ISO 7-bit coded character set for information interchange".

[42] ISO/IEC 6429: "Information technology – Control functions for coded character sets".

[43] ISO 8348 (1987): "Information technology — Open Systems Interconnection — Network Service Definition".

[44] ITU-T Recommendation E.163: "Numbering plan for the international telephone service".

[45] ITU-T Recommendation E.164: "The international public telecommunication numbering plan".

[46] ITU-T Recommendation E.212: "The international identification plan for mobile terminals and mobile users".

[47] ITU-T Recommendation F.69 (1993): "The international telex service – Service and operational provisions of telex destination codes and telex network identification codes".

[48] ITU-T Recommendation I.330: "ISDN numbering and addressing principles".

[49] ITU-T Recommendation Q.920 (1993): "ISDN user-network interface data link layer – General aspects".

[50] ITU-T Recommendation Q.930 (1993): "ISDN user-network interface layer 3 – General aspects".

[51] ITU-T Recommendation I.500 (1993): "General structure of the ISDN interworking recommendations".

[52] ITU-T Recommendation T.50: "International Reference Alphabet (IRA) (Formerly International Alphabet No. 5 or IA5) – Information technology – 7-bit coded character set for information interchange".

[53] ITU Recommendation Q.931: "ISDN user-network interface layer 3 specification for basic control".

[54] ITU-T Recommendation V.21: "300 bits per second duplex modem standardized for use in the general switched telephone network".

[55] ITU-T Recommendation V.22: "1200 bits per second duplex modem standardized for use in the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits".

[56] ITU-T Recommendation V.22bis: "2400 bits per second duplex modem using the frequency division technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits".

[57] Void.

[58] ITU-T Recommendation V.26ter: "2400 bits per second duplex modem using the echo cancellation technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits".

[59] ITU-T Recommendation V.32: "A family of 2-wire, duplex modems operating at data signalling rates of up to 9600 bit/s for use on the general switched telephone network and on leased telephone-type circuits".

[60] ITU-T Recommendation V.110: "Support by an ISDN of data terminal equipments with V-Series type interfaces".

[61] ITU-T Recommendation V.120: "Support by an ISDN of data terminal equipment with V-Series type interfaces with provision for statistical multiplexing".

[62] ITU-T Recommendation X.21: "Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for synchronous operation on public data networks".

[63] Void.

[64] Void.

[65] ITU-T Recommendation X.30: "Support of X.21, X.21 bis and X.20 bis based Data Terminal Equipments (DTEs) by an Integrated Services Digital Network (ISDN)".

[66] ITU-T Recommendation X.31: "Support of packet mode terminal equipment by an ISDN".

[67] Void.

[68] Void.

[69] ITU-T Recommendation X.121: "International numbering plan for public data networks".

[70] ETSI ETS 300 102-1: "Integrated Services Digital Network (ISDN); User-network interface layer 3; Specifications for basic call control".

[71] Void.

[72] ISO/IEC 10646: "Information technology — Universal Multiple-Octet Coded Character Set (UCS)".

[73] 3GPP TS 22.060: "General Packet Radio Service (GPRS); Service Description; Stage 1".

[74] 3GPP TS 23.060: "General Packet Radio Service (GPRS); Service Description; Stage 2".

[75] Void.

[75a] 3GPP TS 43.318: "Generic Access Network (GAN); Stage 2".

[76] 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".

[76b] 3GPP TS 44.318: "Generic Access Network (GAN); Mobile GAN interface layer 3 specification; Stage 3".

[77] Void.

[78] 3GPP TS 44.065: "Mobile Station (MS) – Serving GPRS Support Node (SGSN); Subnetwork Dependent Convergence Protocol (SNDCP)".

[78a] 3GPP TS 44.064: "Mobile Station – Serving GPRS Support Node (MS-SGSN) Logical Link Control (LLC) Layer Specification".

[79] ITU Recommendation I.460: "Multiplexing, rate adaption and support of existing interfaces".

[80] 3GPP TS 26.111: "Codec for Circuit Switched Multimedia Telephony Service; Modifications to H.324".

[81] 3GPP TS 23.107: "Quality of Service (QoS) concept and architecture".

[82] 3GPP TS 43.022: "Functions related to Mobile Station (MS) in idle mode and group receive mode".

[83] 3GPP TS 26.103: "Speech Codec List for GSM and UMTS".

[84] 3GPP TS 44.018: "Mobile radio interface layer 3 specification, Radio Resource Control Protocol".

[85] 3GPP TS 48.008: "Mobile-services Switching Centre – Base Station System (MSC – BSS) interface; layer 3 specification".

[86] 3GPP TS 48.018: "General Packet Radio Service (GPRS); Base Station System (BSS) – Serving GPRS Support Node (SGSN); BSS GPRS Protocol (BSSGP)".

[87] 3GPP TS 43.055: "Dual Transfer Mode (DTM); Stage 2".

[88] 3GPP TS 23.067: "enhanced Multi-Level Precedence and Pre-emption service (eMLPP); Stage 2".

[88a] 3GPP TS 23.093: "Technical realization of Completion of Calls to Busy Subscriber (CCBS); Stage 2".

[89] 3GPP TS 22.042: "Network Identity and Time Zone (NITZ), Stage 1".

[90] 3GPP TS 23.040: "Technical realization of Short Message Service (SMS)".

[91] 3GPP TS 44.056: "GSM Cordless Telephony System (CTS), (Phase 1) CTS Radio Interface Layer 3 Specification".

[92] 3GPP TS 23.226: "Global Text Telephony; Stage 2"

[93] 3GPP TS 26.226: "Cellular Text Telephone Modem (CTM), General Description"

[94] 3GPP TS 23.236: "Intra Domain Connection of RAN Nodes to Multiple CN Nodes"

[95] 3GPP TS 24.229: "IP Multimedia Call Control Protocol based on SIP and SDP"

[96] 3GPP TS 23.205: "Bearer-independent circuit-switched core network; Stage 2".

[97] 3GPP TS 23.172: "UDI/RDI Fallback and Service Modification; Stage 2".

[98] 3GPP TS 25.304: "UE Procedures in Idle Mode and Procedures for Cell Reselection in Connected Mode"

[99] IETF RFC 4291 (February 2006): "Internet Protocol Version 6 (IPv6) Addressing Architecture".

[100] 3GPP TS 29.207, Release 6: "Policy control over Go interface".

[101] 3GPP TS 21.111: "USIM and IC card requirements".

[102] IETF RFC 1661 (July 1994): "The Point-to-Point Protocol (PPP)".

[103] IETF RFC 3232 (January 2002): "Assigned Numbers: RFC 1700 is Replaced by an On-line Database".

[179][180][181][104] 3GPP TS 23.034: "High Speed Circuit Switched Data (HSCSD) – Stage 2".

[105] 3GPP TS 23.271: "Functional stage 2 description of Location Services (LCS)".

[106] 3GPP TS 23.246: "Multimedia Broadcast/Multicast Service (MBMS); Architecture and Functional Description".

[107] IETF RFC 3376 (October 2002): "Internet Group Management Protocol, Version 3".

[108] IETF RFC 2710 (October 1999): "Multicast Listener Discovery (MLD) for IPv6".

[109] 3GPP TS 23.251: "Network Sharing; Architecture and Functional Description".

[110] 3GPP TS 25.346: "Introduction of the Multimedia Broadcast Multicast Service (MBMS) in the Radio Access Network"

[111] 3GPP TS 44.118, Release 11: "Radio Resource Control (RRC) protocol; Iu mode".

[112] 3GPP TS 31.102: "Characteristics of the USIM Application".

[113] 3GPP TS 43.129: "Packet-switched handover for GERAN A/Gb mode; Stage 2".

[114] 3GPP TS 23.009: "Handover procedures".

[115] 3GPP TR 23.903: "Redial solution for voice-video switching".

[116] 3GPP TS 24.279: "Combining Circuit Switched (CS) and IP Multimedia Subsystem (IMS) services, stage 3"

[117] ITU-T Recommendation H.324 Amendment 1: "New Annex K "Media Oriented Negotiation Acceleration Procedure" and associated changes to Annex".

[118] ITU-T Recommendation H.324 Amendment 2: "New Annex L on text conversation and associated changes; corrections and clarifications to Annex K".

[119] ITU-T Recommendation H.245: "Control protocol for multimedia communication"

[120] 3GPP TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3".

[121] 3GPP TS 36.304: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) procedures in idle mode".

[122] 3GPP TS 23.401: "GPRS enhancements for E-UTRAN access".

[123] 3GPP TS 33.401: "3GPP System Architecture Evolution; Security architecture".

[124] 3GPP TS 24.303: "Mobility management based on Dual-Stack Mobile IPv6; Stage 3".

[125] 3GPP TS 24.327: "Mobility between 3GPP WLAN Interworking and 3GPP systems; GPRS and 3GPP I-WLAN aspects; Stage 3".

[126] 3GPP TS 23.216: "Single Radio Voice Call Continuity (SRVCC); Stage 2".

[127] 3GPP TS 23.002: "Network architecture".

[128] 3GPP TS 25.301: "Radio interface protocol architecture".

[129] 3GPP TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification".

[130] 3GPP TS 29.061: "Interworking between the Public Land Mobile Network (PLMN) supporting packet based services and Packet Data Networks (PDN)".

[131] 3GPP TS 23.221: "Architectural requirements".

[132] 3GPP TS 23.090: "Unstructured Supplementary Service Data (USSD); Stage 2".

[133] 3GPP TS 23.272: "Circuit Switched Fallback in Evolved Packet System; Stage 2".

[133A] 3GPP TS 23.682: "Architecture enhancements to facilitate communications with packet data networks and applications".

[134] 3GPP TS 24.167: "3GPP IMS Management Object (MO); Stage 3".

[135] 3GPP TS 24.368: "Non-Access Stratum (NAS) configuration Management Object (MO)".

[136] 3GPP TS 24.237: "IP Multimedia Subsystem (IMS) Service Continuity; Stage 3".

[137] IETF RFC 3261 (June 2002): "SIP: Session Initiation Protocol".

[138] 3GPP TS 22.011: "Service accessibility".

[139] IETF RFC 3633 (December 2003): "IPv6 Prefix Options for Dynamic Host Configuration Protocol (DHCP) version 6".

[140] 3GPP TS 23.012: "Location management procedures".

[141] 3GPP TS 24.022: "Radio Link Protocol (RLP) for circuit switched bearer and teleservices".

[142] ITU-T Recommendation X.1: "International user classes of service in, and categories of access to, public data networks and Integrated Services Digital Networks (ISDNs)".

[143] ITU-T Recommendation X.25: "Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit".

[144] ITU-T Recommendation X.213: "Information technology – Open Systems Interconnection – Network service definition".

[145] ITU-T Recommendation I.334: "Principles relating ISDN numbers/sub-addresses to the OSI reference model network layer addresses".

[146] ITU-T Recommendation H.223: "Multiplexing protocol for low bit rate multimedia communication".

[147] ITU-T Recommendation V.34: "A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits".

[148] IETF RFC 3810 (June 2004): "Multicast Listener Discovery Version 2 (MLDv2) for IPv6".

[149] 3GPP TS 29.018: "General Packet Radio Service (GPRS); Serving GPRS Support Node (SGSN) – Visitors Location Register (VLR); Gs interface layer 3 specification".

[150] 3GPP TS 29.272: "Evolved Packet System (EPS); Mobility Management Entity (MME) and Serving GPRS Support Node (SGSN) related interfaces based on Diameter protocol".

[151] 3GPP TS 45.008: "Radio subsystem link control".

[152] 3GPP TS 29.010: "Information element mapping between Mobile Station – Base Station System (MS – BSS) and Base Station System – Mobile-services Switching Centre (BSS – MSC); Signalling Procedures and the Mobile Application Part (MAP)".

[153] 3GPP TS 36.306: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio access capabilities".

[154] 3GPP TS 24.105: "Application specific Congestion control for Data Communication (ACDC) Management Object (MO)".

[155] 3GPP TS 23.161: "Network-Based IP Flow Mobility (NBIFOM); Stage 2".

[156] 3GPP TS 24.302: "Access to the 3GPP Evolved Packet Core (EPC) via non-3GPP access networks; Stage 3".

[157] 3GPP TS 45.001: "Physical layer on the radio path; General description".

[158] 3GPP TS 24.161: " Network-Based IP Flow Mobility (NBIFOM); Stage 3".

[159] 3GPP TS 43.064: "Overall description of the GPRS Radio Interface; Stage 2".

[160] 3GPP TS 23.167: "IP Multimedia Subsystem (IMS) emergency sessions".

[161] 3GPP TS 26.267: "eCall Data Transfer; In-band modem solution; General description".

[162] 3GPP TS 24.250: "Protocol for Reliable Data Service; Stage 3".

[163] 3GPP TS 24.292: "IP Multimedia (IM) Core Network (CN) subsystem; Centralized Services (ICS); Stage 3".

[164] 3GPP TS 29.292: "Interworking between the IP Multimedia (IM) Core Network (CN) Subsystem (IMS) and MSC Server for IMS Centralized Services (ICS)".

[165] 3GPP TS 49.031: "Location Services (LCS); Base Station System Application Part LCS Extension (BSSAP-LE)".

[166] 3GPP TS 23.501: "System Architecture for the 5G System; Stage 2".

[167] 3GPP TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".

[168] IETF RFC 3629 (November 2003): "UTF-8, a transformation format of ISO 10646".

[169] IETF RFC 5905 (June 2010): "Network Time Protocol Version 4: Protocol and Algorithms Specification".

[170] 3GPP TS 33.501: "Security architecture and procedures for 5G System".

[171] 3GPP TS 24.193: "Access Traffic Steering, Switching and Splitting; Stage 3".

[172] IETF RFC 7858 (May 2016): "Specification for DNS over Transport Layer Security (TLS)".

[173] IETF RFC 8094 (February 2017): "DNS over Datagram Transport Layer Security (DTLS)".

[174] IET RFC 6056 (January 2011): "Recommendations for Transport-Protocol Port Randomization".

[175] IETF RFC 1035 (November 1987):"DOMAIN NAMES – IMPLEMENTATION AND SPECIFICATION".

[176] IETF RFC 7469 (April 2015):"Public Key Pinning Extension for HTTP".

[177] ITU-T Recommendation X.690 (2002) | ISO/IEC 8825-1:2002,
Information technology – ASN.1 encoding rules:
Specification of Basic Encoding Rules (BER), Canonical
Encoding Rules (CER) and Distinguished Encoding Rules
(DER).

[178] 3GPP TS 24.502: "Access to the 3GPP 5G System (5GS) via non-3GPP access networks; Stage 3".

[179] IETF RFC 1334 (October 1992): "PPP Authentication Protocols".

[180] IETF RFC 1994 (August 1996): "PPP Challenge Handshake Authentication Protocol (CHAP)".

[181] IETF RFC 1332 (May 1992): "The PPP Internet Protocol Control Protocol (IPCP)".

[182] 3GPP TS 23.548: "5G System Enhancements for Edge Computing; Stage 2".

[183] 3GPP TS 38.304: "NR; User Equipment (UE) procedures in Idle mode and RRC Inactive state".

[184] 3GPP TS 23.558: "Architecture for enabling Edge Applications; Stage 2".

[185] 3GPP TS 24.174: "Support of multi-device and multi-identity in the IP Multimedia Subsystem (IMS); Stage 3".

2.1 Definitions and abbreviations

For the purposes of the present document, the abbreviations defined in 3GPP TR 21.905 [2a] and the followings apply:

CAT Customized Alerting Tone

CHAP Challenge Handshake Authentication Protocol

DRVCC Dual Radio Voice Call Continuity

eDRX Extended idle-mode DRX cycle

IP-CAN IP-Connectivity Access Network

HNB Home Node B

IoT Internet of Things

Kc 64-bit GSM ciphering key

Kc₁₂₈ 128-bit GSM ciphering key

Kint 128-bit GSM integrity key

L-GW Local PDN Gateway

LHN-ID Local Home Network Identifier

LIPA Local IP Access

MSD Minimum Set of emergency related Data

MTU Maximum Transfer Unit

NB-IoT Narrowband IoT

NR New Radio

PAP Password Authentication Protocol

PSM Power Saving Mode

PVS Provisioning Server

SIPTO Selected IP Traffic Offload

S-NSSAI Single Network Slice Selection Assistance Information

SDNAEPC Secondary DN authentication and authorization over EPC

SNPN Stand-alone Non-Public Network

TMGI Temporary Mobile Group Identity

2.1.1 Random values

In a number of places in the present document, it is mentioned that some value must take a "random" value, in a given range, or more generally with some statistical distribution. Such cases interest only the Mobile Station.

It is required that there is a low probability that two MSs in the same conditions (including the case of two MSs of the same type from the same manufacturer) will choose the same value. Moreover, it is required that, if it happens that two MSs in similar conditions choose the same value, the probability of their choices being identical at the next occasion is the same as if their first choices had been different.

The meaning of such a specification is that any statistical test for these values, done on a series of similar events, will obtain a result statistically compatible with the specified distribution. This shall hold even in the cases where the tests are conducted with a subset of possible events, with some common parameters. Moreover, basic tests of independence of the values within the series shall pass.

Data against which correlation with the values shall not be found are the protocol state, or the IMSI, or identities or other unrelated information broadcast by the network, or the current TDMA frame number.

2.1.2 Vocabulary

For the purposes of the present document, the following terms and definitions apply:

– A GSM security context is established and stored in the MS and the network as a result of a successful execution of a GSM authentication challenge. The GSM security context for the CS domain consists of the GSM ciphering key and the ciphering key sequence number. The GSM security context for the PS domain consists of the GPRS GSM ciphering key and the GPRS ciphering key sequence number.

– A UMTS security context is established and stored in the MS and the network as a result of a successful execution of a UMTS authentication challenge. The UMTS security context for the CS domain consists of the UMTS ciphering key, the UMTS integrity key, the GSM ciphering key, the ciphering key sequence number and the GSM Kc₁₂₈ (if an A5 ciphering algorithm that requires a 128-bit ciphering key is in use). The UMTS security context for the PS domain consists of the GPRS UMTS ciphering key, the GPRS UMTS integrity key, the GPRS GSM ciphering key, the GPRS ciphering key sequence number, the GPRS GSM Kc₁₂₈ (if a GEA ciphering algorithm that requires a 128-bit ciphering key is in use) and the GPRS GSM Kint (if a GIA integrity algorithm that requires a 128-bit integrity key is in use).

– An MS is attached for emergency bearer services if it has successfully completed an attach for emergency bearer services or if it has only a PDN connection for emergency bearer services established.

– idle mode: In this mode, the mobile station is not allocated any dedicated channel; it listens to the CCCH and the BCCH;

– group receive mode: (Only applicable for mobile stations supporting VGCS listening or VBS listening) In this mode, the mobile station is not allocated a dedicated channel with the network; it listens to the downlink of a voice broadcast channel or voice group call channel allocated to the cell. Occasionally, the mobile station has to listen to the BCCH of the serving cell as defined in 3GPP TS 43.022 [82] and 3GPP TS 45.008 [34];

– dedicated mode: In this mode, the mobile station is allocated at least two dedicated channels, only one of them being a SACCH;

– EAB: Extended Access Barring, see 3GPP TS 22.011 [138].

– group transmit mode: (Only applicable for mobile stations supporting VGCS talking) In this mode, one mobile station of a voice group call is allocated two dedicated channels, one of them being a SACCH. These channels can be allocated to one mobile station at a time but to different mobile stations during the voice group call;

– packet idle mode: (only applicable for mobile stations supporting GPRS) In this mode, mobile station is not allocated any radio resource on a packet data physical channel; it listens to the BCCH and the CCCH, see 3GPP TS 44.060 [76].

– packet transfer mode: (only applicable for mobile stations supporting GPRS) In this mode, the mobile station is allocated radio resource on one or more packet data physical channels for the transfer of LLC PDUs.

– main DCCH: In dedicated mode and group transmit mode, only two channels are used as DCCH, one being a SACCH, the other being a SDCCH or a FACCH; the SDCCH or FACCH is called here "the main DCCH";

– A channel is activated if it can be used for transmission, in particular for signalling, at least with UI frames. On the SACCH, whenever activated, it must be ensured that a contiguous stream of layer 2 frames is sent;

– A TCH is connected if circuit mode user data can be transferred. A TCH cannot be connected if it is not activated. A TCH which is activated but not connected is used only for signalling, i.e. as a DCCH;

– The data link of SAPI 0 on the main DCCH is called the main signalling link. Any message specified to be sent on the main signalling link is sent in acknowledged mode except when otherwise specified;

– The term "to establish" a link is a short form for "to establish the multiframe mode" on that data link. It is possible to send UI frames on a data link even if it is not established as soon as the corresponding channel is activated. Except when otherwise indicated, a data link layer establishment is done without an information field.

– "channel set" is used to identify TCHs that carry related user information flows, e.g., in a multislot configuration used to support circuit switched connection(s), which therefore need to be handled together.

– A temporary block flow (TBF) is a physical connection used by the two RR peer entities to support the uni-directional transfer of LLC PDUs on packet data physical channels, see 3GPP TS 44.060 [76].

– RLC/MAC block: A RLC/MAC block is the protocol data unit exchanged between RLC/MAC entities, see 3GPP TS 44.060 [76].

– A GMM context is established when a GPRS attach procedure is successfully completed.

– Network operation mode

The network operation modes I and II are defined in 3GPP TS 23.060 [74].

The network operation mode shall be indicated as system information. For proper operation, the network operation mode should be the same in each cell of one routing area.

– GAN mode: See 3GPP TS 43.318 [75a].

– GPRS MS operation mode

The three different GPRS MS operation modes A, B, and C are defined in 3GPP TS 23.060 [74].

– RR connection: A RR connection is a dedicated physical circuit switched domain connection used by the two RR or RRC peer entities to support the upper layers’ exchange of information flows.

– PS signalling connection is a peer to peer Iu mode connection between MS and CN packet domain node.

– Inter-system change is a change of an MS from A/Gb mode to Iu mode of operation or vice versa, or from S1 mode to A/Gb mode or Iu mode of operation.

– GPRS: Packet services for systems which operate the Gb or Iu-PS interfaces.

– GSM ciphering key: A 64-bit CS GSM ciphering key

– GSM Kc₁₂₈: A 128-bit CS GSM ciphering key

– GPRS GSM ciphering key: A 64-bit PS GSM ciphering key

– GPRS GSM Kc₁₂₈: A 128-bit PS GSM ciphering key

– GPRS GSM Kint: A 128-bit PS GSM integrity key.

– The label (A/Gb mode only) indicates this section or paragraph applies only to a system which operates in A/Gb mode, i.e. with a functional division that is in accordance with the use of an A or a Gb interface between the radio access network and the core network. For multi system case this is determined by the current serving radio access network.

– The label (Iu mode only) indicates this section or paragraph applies only to a system which operates in UTRAN Iu mode , i.e. with a functional division that is in accordance with the use of an Iu-CS or Iu-PS interface between the radio access network and the core network. For multi system case this is determined by the current serving radio access network.

– In A/Gb mode,… Indicates this paragraph applies only to a 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 paragraph applies only to a system which operates in UTRAN Iu mode. For multi system case this is determined by the current serving radio access network.

– In A/Gb mode and GERAN Iu mode,… Indicates this paragraph applies only to a system which operates in A/Gb mode or GERAN Iu mode. For multi system case this is determined by the current serving radio access network.

– In UTRAN Iu mode,… Indicates this paragraph applies only to a system which operates in UTRAN Iu mode. For multi system case this is determined by the current serving radio access network.

– In a shared network,… Indicates this paragraph applies only to a shared network. For the definition of shared network see 3GPP TS 23.122 [14].

NOTE: A shared network is applicable to GERAN and UTRAN, however, according to this definition, a multi-operator core network (MOCN) with common GERAN is not considered a shared network in 3GPP TS 23.122 [14] and in the present specification.

– Multi-Operator Core Network (MOCN) with common GERAN: a network in which different core network operators are connected to a shared GERAN broadcasting only a single, common PLMN identity.

– Chosen PLMN: The same as selected PLMN as specified in 3GPP TS 23.122 [14].

– A default PDP context is a PDP context activated by the PDP context activation procedure that establishes a PDN connection. The default PDP context remains active during the lifetime of the PDN connection.

– A PDP context for emergency bearer services is a default PDP context which was activated with request type "emergency", or any secondary PDP contexts associated to this default PDP context.

– Non-emergency PDP context: Any PDP context which is not a PDP context for emergency bearer services.

– SIM, Subscriber Identity Module (see 3GPP TS 42.017 [7]).

– USIM, Universal Subscriber Identity Module (see 3GPP TS 21.111 [101]).

– MS, Mobile Station. The present document makes no distinction between MS and UE.

– MS configured for dual priority: An MS which provides dual priority support is configured for NAS signalling low priority and also configured to override the NAS signalling low priority indicator (see 3GPP TS 24.368 [135], 3GPP TS 31.102 [112]).

– Cell Notification is an (optimised) variant of the Cell Update Procedure which uses the LLC NULL frame for cell change notification which does not trigger the restart of the READY timer

– DTM: Dual Transfer Mode, see 3GPP TS 44.018 [84] and 3GPP TS 43.055 [87]

– The term "eCall only" applies to a mobile station which is in the eCall only mode, as described in 3GPP TS 22.101 [8].

– "removal of eCall only restriction" means that all the limitations as described in 3GPP TS 22.101 [8] for the eCall only mode do not apply any more.

– "SMS-only service": A subset of services which includes only short message service. The MS can request "SMS-only service" in order to obtain SMS.

– Access domain selection: The process to select whether the CS domain or the IMS/IP‑CAN is used to transmit the call control signalling between MS and core network. Definition derived from 3GPP TS 23.221 [131].

– APN based congestion control: Congestion control in session management where the network can reject session management requests from MSs or deactivate PDP contexts when the associated APN is congested.

– NAS level mobility management congestion control: Congestion control mechanism in the network in mobility management. "NAS level mobility management congestion control" consists of "subscribed APN based congestion control" and "general NAS level mobility management congestion control".

– General NAS level mobility management congestion control: The type of congestion control that is applied at a general overload or congestion situation in the network, e.g. lack of processing resources.

– Group specific session management congestion control: Type of congestion control at session management level that is applied to reject session management requests from MSs belonging to a particular group when one or more group congestion criteria as specified in 3GPP TS 23.060 [74] are met.

– Subscribed APN based congestion control: Congestion control in mobility management where the network can reject attach requests from MSs with a certain APN in the subscription.

– Mapped P-TMSI: A P-TMSI which is mapped from a GUTI previously allocated to the MS by an MME. Mapping rules are defined in 3GPP TS 23.003 [10]. Definition derived from 3GPP TS 23.401 [122].

– Native P-TMSI: A P-TMSI previously allocated by an SGSN. Definition derived from 3GPP TS 23.401 [122].

– Valid LAI: A LAI that is not deleted LAI.

– EMM Combined UE Waiting Flag: See 3GPP TS 29.018 [149].

– Power Saving Mode: Power saving mode allows the MS to reduce its power consumption. When power saving mode is active in the MS, the MS is registered to the network and in PMM-IDLE mode (in Iu mode), EMM-IDLE mode (in S1 mode) or the READY timer is not running (in A/Gb mode) but the AS layer is deactivated. Definition derived from 3GPP TS 23.060 [74] and 3GPP TS 23.401 [122].

– ACDC: Application specific Congestion control for Data Communication, see 3GPP TS 22.011 [138].

– Highest ranked ACDC category: The ACDC category with the lowest value as defined in 3GPP TS 24.105 [154].

– Extended idle-mode DRX cycle: Extended idle-mode DRX cycle allows the MS to reduce its power consumption in PMM-IDLE mode (in Iu mode) or when the READY timer is not running (in A/Gb mode) or in EMM-IDLE mode (in S1 mode). Extended idle-mode DRX cycle is associated with the eDRX cycle value. Definition derived from 3GPP TS 23.060 [74] and 3GPP TS 23.401 [122].

– EC-GSM-IoT: Extended coverage in GSM for IoT is a feature which enables extended coverage operation. See 3GPP TS 43.064 [159].

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.401 [122], subclause 3.2, apply:

DCN-ID

Globally Unique MME Identifier (GUMMEI)

Globally Unique Temporary Identity (GUTI)

Idle Mode Signalling Reduction (ISR)

M-Temporary Mobile Subscriber Identity (M-TMSI)

NarrowBand-IoT

PDN connection

Tracking Area Identity (TAI)

Temporary Identity used in Next update (TIN)

For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.301 [120] apply:

CSG cell

CSG ID

CSG selection

EMM

EMM-IDLE mode

EPS

ESM

In NB-S1 mode

In WB-S1 mode

LIPA PDN connection

MO MMTEL voice call is started

MO MMTEL video call is started

MO SMSoIP is started

MS configured to use AC11 – 15 in selected PLMN: see UE configured to use AC11 – 15 in selected PLMN

PDN connection for emergency bearer services

S1 mode

SIPTO at the local network PDN connection

SIPTO at the local network PDN connection with collocated L-GW

SIPTO at the local network PDN connection with stand-alone GW

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.272 [133] apply:

CS fallback

SMS over SGs

For the purposes of the present document, the following terms and definitions given in 3GPP TS 33.401 [123] apply:

Current EPS security context

Mapped security context

eKSI

CK’ and IK’

NAS downlink COUNT

NAS uplink COUNT

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.251 [109] apply:

Multi-Operator Core Network (MOCN)

Network Sharing non-supporting MS: see non-supporting UE.

Network Sharing supporting MS: see supporting UE.

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.122 [14] apply:

Country

EHPLMN

HPLMN

Suitable Cell

VPLMN

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.216 [126] apply:

SRVCC

vSRVCC

CS to PS SRVCC

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.251 [109] and 3GPP TS 44.018 [84] apply:

Common PLMN

For the purposes of the present document, the following terms and definitions given in 3GPP TS 44.018 [84] apply:

Additional PLMN

Network sharing

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.003 [10] apply:

Local Home Network Identifier

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.161 [155] apply:

RAN rules handling parameter

For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.302 [156] apply:

move-traffic-to-WLAN indication

move-traffic-from-WLAN indication

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.060 [74] apply:

Dedicated core network

For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.161 [158] apply:

NBIFOM

multi-access PDN connection

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.167 [160] apply:

eCall over IMS

For the purposes of the present document, the following terms and definitions given in 3GPP TS 22.101 [8] apply:

Minimum Set of Data (MSD)

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.501 [166] apply:

NG-RAN

For the purposes of the present document, the following terms and definitions given in 3GPP TS 24.501 [167] apply:

5GCN

5GMM

5GS

5GSM

DNN

DNN based congestion control

In NB-N1 mode

In WB-N1 mode

N1 mode

Service-level-AA

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.221 [131] apply:

Restricted local operator services

For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.038 [8b] apply:

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