3 Definitions, symbols and abbreviations

23.2833GPPMission Critical Communication Interworking with Land Mobile Radio SystemsRelease 18TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 [1].

End‑to‑End Encryption: encryption that is applied by an originating terminal or client and is decrypted only by chosen terminating terminals or clients.

User homed in the IWF: is an MC service ID that represents an LMR user in the MC system.

Interworking: a means of communication between mission critical systems and LMR systems whereby MC users obtaining service from a mission critical system can communicate with LMR users who are obtaining service from one or more LMR systems.

Interworking function: adapts LMR Systems to mission critical systems via the IWF interface and supports interworking between LMR systems and mission critical systems.

Interworking group: a group, which is composed of group members from the MC system and the LMR system and defined in the MC system or the LMR system.

LMR system: the collection of applications, services, and enabling capabilities providing a land mobile radio service offering group and private communications.

LMR user: a user of a device which allows participation in an LMR system.

NOTE: The term LMR user is defined for discussion purposes only and is out of scope of the present document.

3.2 Abbreviations

For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in 3GPP TR 21.905 [1].

E2EE End-to-End Encryption

IWF InterWorking Function

KEK Key Encryption Key (TETRA)

KMS Key Management Service

MC Mission Critical

MCPTT Mission Critical Push To Talk

LMR Land Mobile Radio

OTAK Over-The-Air-Key Management (TETRA)

OTAR Over-The-Air Rekeying (P25)

P25 Project 25

SDS Short Data Service

TETRA TErrestrial Trunked Radio

UE User Equipment

UKEK Unique Key Encryption Key (P25)

URI Uniform Resource Identifier