ETSI TS 133 180 V15.14.0 (2026-02)

LTE; 5G; Security of the Mission Critical (MC) service (3GPP TS 33.180 version 15.14.0 Release 15)

RTS/TSGS-0333180vfe0

General Information

• Status: Not Published
• Technical Committee: 3GPP SA 3 - Security
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 26-Feb-2026

Standards Content (Sample)

TECHNICAL SPECIFICATION
LTE;
5G;
Security of the Mission Critical (MC) service
(3GPP TS 33.180 version 15.14.0 Release 15)

3GPP TS 33.180 version 15.14.0 Release 15 1 ETSI TS 133 180 V15.14.0 (2026-02)

Reference
RTS/TSGS-0333180vfe0
Keywords
5G,LTE
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ETSI
3GPP TS 33.180 version 15.14.0 Release 15 2 ETSI TS 133 180 V15.14.0 (2026-02)
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ETSI
3GPP TS 33.180 version 15.14.0 Release 15 3 ETSI TS 133 180 V15.14.0 (2026-02)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 12
1 Scope . 13
2 References . 13
3 Definitions and abbreviations . 15
3.1 Definitions . 15
3.2 Abbreviations . 16
4 Overview of Mission Critical Security . 17
4.1 General . 17
4.2 Signalling plane security architecture. 17
4.3 MC system security architecture . 18
4.3.1 General . 18
4.3.2 User authentication and authorisation . 18
4.3.3 Identity keying of users and services . 19
4.3.4 Protection of application plane signalling . 20
4.3.4.1 Application plane signalling security . 20
4.3.4.2 Security enforcement at the network edge . 21
4.3.5 Media security . 23
4.3.5.1 General . 23
4.3.5.2 Media security for group communications. . 23
4.3.5.3 Media security for private calls . 24
5 Common mission critical security framework . 26
5.1 User authentication and authorization . 26
5.1.1 General . 26
5.1.2 User authentication . 27
5.1.2.1 Identity management functional model . 27
5.1.2.2 User authentication framework . 28
5.1.2.3 OpenID Connect (OIDC) . 29
5.1.2.3.1 General . 29
5.1.2.3.2 User authentication example using username/password . 30
5.1.3 MCX user service authorisation. 30
5.1.3.1 General . 30
5.1.3.2 MCX user service authorization with MCX Server . 33
5.1.3.2.1 General . 33
5.1.3.2.2 Using SIP REGISTER . 33
5.1.3.2.3 Using SIP PUBLISH . 34
5.1.4 Inter-domain MC user service authorization . 34
5.1.4.1 General . 34
5.1.4.2 Inter-domain identity management functional model . 34
5.1.5 MC user migration service authentication and authorisation . 36
5.2 Key management common elements . 38
5.2.1 Overview of key management . 38
5.2.2 Common key distribution . 38
5.2.3 Key distribution with end-point diversity . 40
5.2.4 Key distribution with associated parameters . 42
5.2.5 Key distribution with SAKKE-to-self payload . 43
5.2.6 Key distribution with identity hiding . 44
5.2.7 Key distribution across multiple security domains . 45
5.2.7.1 General . 45
5.2.7.2 Identification of External Security Domains . 45
5.2.7.3 Using multiple security domains . 46
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5.2.8 KMS Redirect Responses (KRRs) . 46
5.2.8.1 Overview of KMS Redirect Response procedure (KRR) . 46
5.2.8.1.1 General . 46
5.2.8.1.2 KMSs and KMS URIs . 47
5.2.8.2 Use of KRRs . 47
5.2.8.2.1 Content of KRRs . 47
5.2.8.2.2 KRR creation procedure by a receiver . 47
5.2.8.2.3 KRR creation procedure by a MCX server or signalling proxy . 48
5.2.8.2.4 Processing a KRR at a MCX server or signalling proxy . 48
5.2.8.2.5 KMS Selection at the initiator . 49
5.2.8.3 Security procedures for KMS Redirection Response . 50
5.2.8.4 Security Procedures for reporting external security domain use . 52
5.2.8.5 Policy around use of external security domains . 52
5.3 User key management . 52
5.3.1 Key Management Server (KMS) . 52
5.3.1.1 General . 52
5.3.1.2 Home KMS . 53
5.3.1.3 Migration KMS . 53
5.3.1.4 External KMS . 54
5.3.2 Functional model for key management . 54
5.3.3 Security procedures for key management . 55
5.3.4 Provisioned key material to support end-to-end communication security . 56
5.3.5 KMS Certificate . 57
5.3.6 KMS provisioned Key Set . 57
5.4 Key management from MC client to MC server (CSK upload) . 58
5.5 Key management between MCX servers (SPK) . 58
5.6 Key management for one-to-one (private) communications (PCK) . 58
5.7 Key management for group communications (GMK) . 59
5.7.1 General . 59
5.7.2 Security procedures for GMK provisioning . 59
5.7.3 Group member GMK management . 60
5.8 Key management from MC server to MC client (Key download) . 61
5.8.1 General . 61
5.8.2 ‘Key download' procedure . 61
5.9 Key management during MBMS bearer announcement . 62
5.10 Void . 62
5.10.1 Void . 62
5.10.2 Void . 62
5.10.3 Void . 62
5.10.3.1 Void. 62
5.10.3.2 Void. 62
5.10.3.3 Void. 62
5.10.3.4 Void. 62
5.10.3.5 Void. 62
5.10.4 Void . 62
5.10.4.1 Void. 62
5.10.4.2 Void. 62
5.11 UE key storage and key persistence . 62
5.11.1 Key storage . 62
5.11.2 Key persistence . 63
6 Supporting security mechanisms . 63
6.1 HTTP . 63
6.1.1 Authentication for HTTP-1 interface . 63
6.1.2 HTTP-1 interface security . 64
6.1.3 HTTP-3 interface security . 64
6.2 SIP . 64
6.2.1 Authentication for SIP core access . 64
6.2.2 SIP-1 interface security . 64
6.3 Network domain security . 64
6.3.1 LTE access authentication and security . 64
6.3.2 Inter/Intra domain interface security . 64
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7 MCPTT and MCVideo . 65
7.1 General . 65
7.2 Private communications . 65
7.2.1 Key management . 65
7.2.2 Security procedures (on-network) . 65
7.2.3 Security procedures (off-network) . 67
7.2.4 First-to-answer security and key management . 68
7.2.4.1 Overview . 68
7.2.4.2 First-to-answer request and response . 69
7.2.4.3 First-to-answer call setup with security. 69
7.2.4.4 First-to-answer media protection . 71
7.2.5 Ambient listening call . 71
7.2.6 Ambient viewing call . 71
7.2.7 Private video pull . 72
7.2.7.1 One-to-one video pull . 72
7.2.7.2 One-from-server video pull . 72
7.2.8 Private video push . 73
7.2.8.1 One-to-one video push . 73
7.2.8.2 One-to-server video push . 74
7.2.8.3 Remotely initiated video push . 74
7.3 Group communications . 76
7.3.1 General . 76
7.3.2 Group creation security procedure . 76
7.3.3 Dynamic group keying . 76
7.3.3.1 General . 76
7.3.3.2 Group regrouping security procedure (within a single MC domain) . 77
7.3.3.3 Group regrouping security procedure (involving multiple MC domains) . 77
7.3.4 Broadcast group call . 78
7.3.5 Group-broadcast group call. 78
7.3.6 Emergency group call . 79
7.3.7 Imminent peril group call . 79
7.3.8 Emergency Alert . 79
7.3.9 Remotely initiated video push to group . 80
7.3.10 Multi-talker configured MCPTT group . 81
7.4 Key derivation for media . 82
7.4.1 Derivation of SRTP master keys for private call . 82
7.4.2 Derivation of SRTP master keys for group media . 82
7.5 Media protection profile . 83
7.5.1 General . 83
7.5.2 Security procedures for media stream protection. 84
8 MCData . 86
8.1 Overview . 86
8.2 Key Management . 87
8.3 One-to-one communications . 88
8.4 Group communications . 88
8.5 MCData payload protection . 89
8.5.1 General . 89
8.5.2 Prequisites . 89
8.5.2.1 Prequisites for protected payloads . 89
8.5.2.2 Prequisites for authenticated payloads . 89
8.5.3 Key derivation for protected payloads . 89
8.5.4 Payload protection . 90
8.5.4.1 Format of protected payloads . 90
8.5.4.2 Encryption of protected payloads . 90
8.5.5 Payload authentication . 91
9 Signalling protection . 91
9.1 General . 91
9.2 Key distribution for signalling protection . 92
9.2.1 Client-Server Key (CSK) . 92
9.2.1.1 General . 92
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9.2.1.2 Creation of the CSK . 92
9.2.1.3 Initial 'CSK Upload' Procedure . 92
9.2.1.4 CSK update via 'key download'. 93
9.2.2 Multicast Signalling Key (MuSiK) . 93
9.2.3 Signalling Protection Key (SPK) . 94
9.3 Application signalling security (XML protection) . 95
9.3.1 General . 95
9.3.2 Protected content . 95
9.3.3 Key agreement . 96
9.3.4 Confidentiality protection using XML encryption (xmlenc) . 96
9.3.4.1 General . 96
9.3.4.2 XML content encryption . 96
9.3.4.3 XML URI attribute encryption . 97
9.3.5 Integrity protection using XML signature (xmlsig) . 98
9.4 RTCP signalling protection (SRTCP) . 99
9.4.1 General . 99
9.4.2 Unicast RTCP protection between client and server . 100
9.4.3 Multicast RTCP protection between client and server . 100
9.4.4 Offline floor and transmission control protection . 100
9.4.5 RTCP protection between servers . 100
9.4.6 Key derivation for SRTCP . 100
9.4.7 Security procedures for transmission of RTCP content . 101
9.4.8 RTCP protection profile . 102
9.5 MCData signalling protection . 103
9.5.1 Key distribution for signalling protection . 103
9.5.2 Protection of MCData application signalling payloads (XML) . 103
9.5.3 Protection of MCData signalling payloads . 103
9.6 Message origin authentication and authorisation . 103
9.6.1 General . 103
9.6.2 Origin authentication and authorisation in the MC System . 104
9.6.2.1 Types of signalling . 104
9.6.2.2 Privileged Signalling . 105
9.6.2.3 Signalling between network entities across domains . 105
9.6.2.4 Signalling between the GMS and the GMC . 105
9.6.2.5 Signalling between the MC domain and a migrated user . 106
9.6.2.6 Off-network signalling . 106
9.6.3 Authorised Identities . 106
9.6.3.1 Format of an Authorised Identity . 106
9.6.3.2 Obtaining an Authorised Identity . 107
9.6.4 Element for Authenticating Requests (EARs) . 107
9.6.4.1 Overview . 107
9.6.4.2 The EAR information element . 107
9.6.4.3 EAR authorisation . 107
9.6.5 Security procedures for origin authentication . 108
9.6.5.1 General . 108
9.6.5.2 SIP signalling . 108
9.6.5.2.1 General . 108
9.6.5.2.2 Group affiliation and deaffiliation signalling . 108
9.6.5.3 Off-network signalling . 109
9.6.5.4 Processing a received EAR . 109
10 Logging, Audit and Discreet Monitoring . 109
10.1 Logging and audit of service metadata . 109
10.1.1 Overview . 109
10.1.2 User events. 110
10.1.2.1 Types of events . 110
10.1.2.2 Location of recording function . 110
10.1.2.3 Security content within user event logs . 110
10.1.2.4 Protection of user event logs . 111
10.2 Audit and Discreet Monitoring of user content . 111
10.2.1 Overview . 111
10.2.2 Collection of user media . 111
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10.2.3 Storing of user media . 111
10.2.4 Decryption of user media . 111
11 Interconnection, interworking and migration security . 112
11.1 Interconnection . 112
11.1.1 Overview . 112
11.1.2 Security procedures for interconnection . 113
11.1.2.1 General . 113
11.1.2.2 GMK transfer between MC systems . 113
11.2 Interworking .
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