Description
The MCVideo Imminent peril Group (MVIG) is a specialized group construct within the 3GPP-defined Mission Critical Services (MCS) framework, specifically for the MCVideo service. It is not a standalone network element but a logical grouping of users (subscribers) and their associated communication parameters, defined within the mission critical service's group management system. An MVIG is typically pre-configured by a mission critical service administrator to include specific first responders, dispatchers, or other personnel who must be immediately involved in responding to a critical incident. The group definition includes member identities, their roles, and the specific MCVideo communication services (like group calls, video sharing) authorized for use within the context of an imminent peril.
Architecturally, the MVIG data is stored and managed within the Mission Critical Service's functional entities, such as the Group Management Application Server. When an imminent peril event is declared, the service logic references the specific MVIG to determine the target recipients for alerts and to establish the initial communication session. The group's configuration dictates how the MCVideo service is invoked—for example, it may trigger an automatic, pre-emptive MCVideo Imminent Peril Group Call (MVIGC) that grants high-priority resources and potentially pre-empts other network traffic to ensure immediate connectivity for the group members.
Its role in the network is to provide a deterministic and rapid mobilization mechanism for video-enabled emergency response. By having these groups predefined, the time to establish critical communication is drastically reduced compared to ad-hoc group formation during a crisis. The network uses the MVIG identifier to apply specific Quality of Service (QoS) policies, priority treatment, and security controls as defined for mission critical communication, ensuring that video streams for the group receive the necessary bandwidth, low latency, and high reliability over the LTE or 5G network.
Purpose & Motivation
MVIG was created to address the critical need for immediate and coordinated video communication during life-threatening emergencies for public safety organizations. Prior to standardized mission critical services over cellular networks, first responders relied on legacy land mobile radio (LMR) systems, which often lacked integrated video capabilities and efficient group alerting mechanisms for imminent threats. The transition to 3GPP-based broadband networks enabled rich media like video, but required standardized methods to replicate and enhance the rapid group dispatch features of LMR.
The introduction of MVIG in Release 14 as part of the broader MCVideo service suite solved the problem of slow and manual group formation during emergencies. It allows control rooms and systems to trigger a coordinated video response with a single action, targeting a pre-defined set of personnel. This is crucial in scenarios like active shooter situations, major fires, or natural disasters where seconds count, and situational awareness via video is vital. MVIG provides the logical framework that enables the network to treat the group's communication with the highest priority, ensuring resources are allocated immediately to support the emergency response.
Classification
Detected Changes Across Releases
from 3GPP Change RequestsSpecific changes extracted from the „Change history“ tables of 3GPP specifications (121 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 Imminent Peril Group (MVIG) function was introduced, defining the client's internal perspective of an MCVideo imminent peril group call state and an MCVideo imminent peril group state. This release also specified the supporting call control protocol for MCVideo imminent-peril calls, which can be provided both on-network and off-network.
- 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
- Subscription to group dynamic data TS 24.281CR0061
- Correction to session-type in XML schema for MCVideo Information TS 24.281CR0039
+ 9 more changes
In Release 16, the MVIG function was enhanced with support for off-network MCVideo operations, as defined in the new MCVideo Off-Network Protocol (MVONP). This allowed MCVideo imminent-peril group calls and other services to function in direct-mode communications outside cellular coverage. The release also included corrections and fixes to improve the reliability of emergency upgrades, alert elements, and location data schemas for these critical scenarios.
In Release 17, the MVIG (MCVideo Imminent Peril Group) function was enhanced through new procedures for emergency alerts and geographic area notifications, including handling for client-side emergency alert area notifications and functionality for entry into or exit from a group geographic area. The release also introduced interconnect procedures for MCVideo Emergency Alerts and aligned MCVideo procedures between 5GS and EPS. Furthermore, support was added for controlling the limit of simultaneous logins and for using preconfigured groups in regroup operations.
- 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
- Check for Preconfigured Group Use Only TS 24.281CR0104
- Call control - Restricting MCVideo private communications TS 24.281CR0105
+ 34 more changes
In Release 18, the MVIG (MCVideo Imminent peril Group) function was enhanced with new procedures to support emergency adhoc group calls and imminent peril adhoc group calls, including the ability to subscribe to participant information of an ongoing ad hoc group call. It also introduced support for MCVideo over 5G ProSe and the use of 5G MBS transmission, expanding the delivery mechanisms for these critical communications. Furthermore, the release added capabilities for location reporting configuration by authorized users and procedures for clients affiliating to a group already in an emergency alert state.
- 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
+ 35 more changes
In Release 19, the MVIG (MCVideo Imminent Peril Group) function was enhanced through improved handling of participant criteria during an ongoing ad hoc group emergency alert, including modifications to the SIP messages containing participant lists sent to authorized users. It also introduced authorization for modifications to an ad hoc group call based on local policy and added mechanisms for an authorized user to release such a call. Furthermore, corrections were made to the procedures and XML schemas for ad hoc group emergency alerts and calls to ensure proper operation.
- 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
- Ad hoc group call release by an authorized user TS 24.281CR0289
- FRMCS_Ph5 Adding reason to leave a session in MCVideo TS 24.281CR0290
+ 13 more changes
Explore further
Broader topics and technologies where MVIG plays a role.
Defining Specifications
3GPP specifications that define or reference MVIG, 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 |