Description
MCVideo Emergency Private Call (MVEPC) is a specialized service defined within the 3GPP framework for Mission Critical services over LTE (MCPTT) and 5G systems. It enables the establishment of a private, one-to-one real-time video communication session with emergency priority between authorized users, typically a dispatcher in a control room and a first responder in the field. The service is an integral part of the broader MCVideo suite, which extends mission-critical voice (MCPTT) to include video and data capabilities for public safety and critical communications.
Architecturally, MVEPC operates within the 3GPP Mission Critical Services architecture, which includes functional entities such as the Mission Critical Service Client (MC Client) on the user equipment, the Mission Critical Server (e.g., MCVideo Server), and interfaces to the underlying 3GPP Evolved Packet Core (EPC) or 5G Core (5GC). The call initiation is triggered by a user with appropriate authorization, often via a dedicated emergency button or menu option on the MC client application. The request is signaled to the MCVideo server using protocols defined in 3GPP TS 24.281 (Application layer) and TS 37.579 (Management and orchestration aspects). The server authenticates the request, verifies the user's privileges for emergency private calls, and orchestrates the session establishment.
The core of MVEPC's operation lies in its integration with the network's Quality of Service (QoS) and priority mechanisms. Upon initiation, the service leverages standardized QoS Class Identifiers (QCIs) or 5G QoS Indicators (5QIs) specifically allocated for mission-critical communication. These ensure the video media streams are marked for high priority, granting them preferential treatment over normal user traffic in terms of resource allocation, admission control, and packet scheduling across both the radio access network (RAN) and the core network. This results in lower latency, higher reliability, and guaranteed bandwidth for the emergency video feed. The 'Private' aspect means the call is established exclusively between the two parties, with no other users able to join or listen in, ensuring confidentiality for sensitive operational communications. The session is managed end-to-end, with the MCVideo server handling floor control (granting the right to send video), media distribution, and potentially recording for operational logging.
Purpose & Motivation
MVEPC was created to address the critical need for immediate, reliable, and private visual communication during emergency response operations. Prior to its standardization, first responders relied primarily on voice (land mobile radio) or commercial video calling apps, which lacked guaranteed priority, security, and integration with public safety operational protocols. Commercial services could suffer from congestion, delay, or failure during large-scale incidents precisely when communication is most vital.
The development of MVEPC was motivated by the 3GPP's work to adapt LTE and later 5G technologies for mission-critical use cases, driven by global public safety organizations. It solves the problem of establishing a trusted visual link between command and field personnel to assess situations, provide remote guidance, or share visual evidence in real-time. By being a standardized service within the 3GPP ecosystem, it ensures interoperability between equipment from different vendors and across different network operators, which is essential for joint operations during major disasters. It directly addresses the limitations of previous proprietary or best-effort solutions by providing a network-enforced emergency priority pathway, integrated authentication, and a service architecture designed for robustness and control.
Classification
Detected Changes Across Releases
from 3GPP Change RequestsSpecific changes extracted from the „Change history“ tables of 3GPP specifications (126 CRs across 5 releases). Complements the general historical overview above with the evidence-based evolution of this function.
Studied in Rel-14, normative work from Rel-15.
In Release 15, the MCVideo Emergency Private Call (MVEPC) function was introduced, enabling emergency private calls between two users. This release specified the supporting call control protocol for these calls, which can be established both on-network and off-network, in alignment with the MCVideo architectural procedures.
- MCVideo ambient viewing client procedures TS 24.281CR0033
- MCVideo ambient viewing participating MCVideo function procedures and controlling MCVideo function procedures TS 24.281CR0034
- MCVideo ambient viewing general description TS 24.281CR0035
- Usage of MBMS for MCVideo - signaling control TS 24.281CR0037
- Correction to session-type in XML schema for MCVideo Information TS 24.281CR0039
- Fix issues with encoding of IEs in MONP messages for MCVideo TS 24.281CR0046
+ 8 more changes
In Release 16, the MVEPC (MCVideo Emergency Private Call) function was enhanced with specific corrections and new support capabilities. Key updates included fixes for emergency upgrade procedures and alert elements, corrections to the location schema, and the completion of necessary IANA registrations for MCVideo parameters. Furthermore, the release formally introduced off-network support for MCVideo calls, extending emergency private call functionality beyond on-network coverage.
In Release 17, the MCVideo Emergency Private Call (MVEPC) function was enhanced with new capabilities for controlling private communications, including mechanisms for restricting MCVideo private communications. It also introduced interconnect procedures for emergency alerts and functional alias handling, aligning with broader mission-critical services. Furthermore, location reporting for emergencies was improved by adding altitude, timestamp, and accuracy attributes to the MCVideo location XML schema.
- Functional Alias usage in MCVideo Call TS 24.281CR0093
- Add altitude, timestamp to MCVideo location XML schema TS 24.281CR0095
- Add preconfigured regroup to MCVideo TS 24.281CR0096
- Control per service authorizations limit for MCVideo service TS 24.281CR0100
- Call control - Restricting MCVideo private communications TS 24.281CR0105
- Emergency alert area notification functionalities handling for MCVideo TS 24.281CR0106
+ 34 more changes
In Release 18, the MVEPC (MCVideo Emergency Private Call) function was enhanced with new support for emergency and imminent peril ad hoc group calls, as indicated in the CR titles. Furthermore, the release introduced more detailed location request procedures using functional aliases and expanded the mechanisms for location reporting configuration by authorized users. These updates built upon the existing architectural procedures for MCVideo emergency calls and alerts specified for both on-network and off-network scenarios.
- Use of 5G MBS transmission in MCVideo signalling plane TS 24.281CR0199
- Add the description of 5MBS in MCVideo TS 24.281CR0220
- MCVideo support of multiplexing - SDP offers and answers TS 24.281CR0215
- Support MCVideo over 5G ProSe TS 24.281CR0225
- General adhoc group call procedures in single system - Protoc impl for MCVideo TS 24.281CR0221
- Adhoc group call participants modify procedures in single system - protoc impl MCVideo TS 24.281CR0226
+ 43 more changes
In Release 19, enhancements for MCVideo Emergency Private Call (MVEPC) included refined criteria for dynamically modifying participant lists during an ongoing ad hoc group emergency alert and call. The release also introduced the ability to add specific criteria to the SIP message containing participant lists sent to authorized users for ad hoc group emergency alerts. Furthermore, corrections and enhancements were made to the handling of these ad hoc group communications, including schema corrections for location-info and regroup operations.
- Modify list of participants by changing the criteria during an ongoing MCVideo ad hoc group call TS 24.281CR0278
- Adhoc group emergency alert add criteria to the SIP message containing the participant lists sent to the authorised users TS 24.281CR0279
- MCVideo adhoc group call to migrated user TS 24.281CR0280
- Modifying the criteria for determining the participants during an ongoing ad hoc group emergency alert TS 24.281CR0282
- FRMCS_Ph5 Adding reason to leave a session in MCVideo TS 24.281CR0290
- Enhance handling of criteria for ad hoc group communication (MCVideo) TS 24.281CR0267
+ 11 more changes
Explore further
Broader topics and technologies where MVEPC plays a role.
Defining Specifications
3GPP specifications that define or reference MVEPC, with the latest known release. Sourced from the 3GPP document catalog — see methodology.
| Specification | Title | Release |
|---|---|---|
| TS 24.281 vj40 | MCVideo Signalling Control Specification | Rel-19 |
| TS 37.579 vi40 | Mission Critical services conformance testing | Rel-18 |