Content for  TR 23.779  Word version:  13.0.0

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1  Scopep. 13

This Technical Report contains the results of the Stage 2 study and evaluation of possible 3GPP technical system solutions for the Mission Critical Push To Talk over LTE (MCPTT) application. This TR will identify the architecture needed to support MCPTT services based on the Stage 1 requirements, including TS 22.179. This Technical Report depends on functionality specified in 3GPP specifications.

2  Referencesp. 13

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.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 22.179: "Mission Critical Push to Talk MCPTT".
TS 23.468: "Group Communication System Enablers for LTE (GCSE_LTE)".
TS 23.303: "Proximity-based Services (ProSe)".
TS 23.218: "Internet Multimedia (IM) Session Handling; IM Call Model".
TR 23.713: "Study on Extended Architecture Support for Proximity-based Services".
TS 33.203: "Access Security for IP-based Services".
RFC 3261:  "SIP: Session Initiation Protocol".
RFC 4582:  "The Binary Floor Control Protocol (BFCP)".
TS 24.525: "Business trunking; Architecture and functional description".
TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".
TS 23.002: "Network Architecture".
TS 23.228: "IP Multimedia Subsystem (IMS)".
Open Mobile Alliance™, OMA-AD-PCPS-V1_0: "Push to Communicate for Public Safety Architecture".
TS 24.173: "IMS Multimedia telephony communication service and supplementary services; Stage 3".
TS 22.278: "Service requirements for the Evolved Packet System (EPS)".
TS 23.237: "IP Multimedia Subsystem (IMS) Service Continuity; Stage 2".
TS 23.003: "Numbering, addressing and identification".
TS 23.008: "Organization of subscriber data".
RFC 6749:  "The OAuth 2.0 Authorization Framework".
RFC 5245:  "Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols".
TR 23.797: "Study on architecture enhancements to support Isolated E-UTRAN Operation for Public Safety".
TS 24.371: "Web Real-Time Communications (WebRTC) access to the IP Multimedia (IM) Core Network (CN) subsystem (IMS); Stage 3; Protocol specification".
TR 33.871: "Study on security for Web Real Time Communications (WebRTC) IP Multimedia Subsystem (IMS) client access to IMS".
TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)".
TS 23.246: "Multimedia Broadcast/Multicast Service (MBMS); Architecture and functional description".
RFC 5850:  "A Call Control and Multi-Party Usage Framework for the Session Initiation Protocol (SIP)".
TS 23.179: "Functional architecture and information flows to support mission critical communication services".

3  Definitions and abbreviationsp. 14

3.1  Definitionsp. 14

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply.
A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
Floor control:
An arbitration system in an MCPTT Service that determines who has the authority to transmit (talk) at a point in time during an MCPTT call.
Group Affiliation:
A mechanism by which an MCPTT user's interest in one or many MCPTT groups is determined. The affiliation procedure is performed by the MCPTT user (explicitly), MCPTT UE (implicitly) or MCPTT service (implicitly. e.g. emergency, re-grouping, etc.).
Group Call:
A mechanism by which an MCPTT user can make a one-to-many MCPTT transmission to other users that are members of MCPTT Group(s).
MCPTT Service:
A Push To Talk communication service supporting applications for Mission Critical Organizations and mission critical applications for other businesses and organizations (e.g., utilities, railways) with fast setup times, high availability, reliability and priority handling.
MCPTT system:
The collection of applications, services, and enabling capabilities required to provide Mission Critical Push To Talk for a Mission Critical Organization.
Obtaining service from an MCPTT system where no MCPTT user profile exists for that MCPTT user.
Mission Critical Push To Talk:
A group communication service with fast setup times, ability to handle large groups, strong security and priority handling.
Off-Network MCPTT Service:
The collection of functions and capabilities required to provide MCPTT using ProSe Discovery and the ProSe Communication path for MCPTT Users using Public Safety ProSe-enabled UEs as a direct communication between UEs using E-UTRA or possibly via a ProSe UE-to-UE Relay.
On-Network MCPTT Service:
The collection of functions and capabilities required to provide MCPTT via EPS bearers using E-UTRAN to provide the last hop radio bearers.
Partner MCPTT system:
Allied MCPTT system that provides MCPTT services to an MCPTT user based on the MCPTT user profile that is defined in the primary MCPTT system of that MCPTT user.
Primary MCPTT system:
MCPTT system where the MCPTT user profile of an MCPTT user is defined.
Private Call:
A call between a pair of MCPTT Users using the MCPTT Service with or without MCPTT Floor control.
UE-to-Network Relay MCPTT Service:
The collection of functions and capabilities required to provide MCPTT via a ProSe UE-to-Network Relay using ProSe direct communication paths to provide the last hop radio bearer(s).

3.2  Abbreviationsp. 15

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply.
An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
Group Management Function
Isolated E-UTRAN Operation for Public Safety
Mission Critical Push To Talk over LTE
MCPTT Application Server
Next Generation Corporate Network
Open Mobile Alliance
Project 25
Push to Communicate for Public Safety
Push To Talk Over Cellular
Public Safety User Data Function
Push To Talk
TETRA and Critical Communications Evolution
Terrestrial Trunked RAdio
XML Documentation Management Server

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