MCVideo Imminent peril Group Call

Description

The MCVideo Imminent Peril Group Call (MVIGC) is the actual communication session instantiated for an MVIG when an imminent peril situation is declared. It is a specific type of Mission Critical Group Call that utilizes the MCVideo service enablers to establish a real-time, multimedia group communication session with video as a primary medium. The call is characterized by its high priority and potential to pre-empt other network traffic. The process begins when an authorized user or system (e.g., a dispatcher application) initiates an MVIGC request, referencing a specific MVIG identifier. This request is sent to the MCVideo application server, which authenticates the request and retrieves the MVIG configuration.

Architecturally, the MCVideo AS then interacts with the underlying 3GPP network—initially the Evolved Packet Core (EPC) in LTE or the 5G Core Network (5GC)—to establish the necessary bearer resources for the group call. This involves signaling to the Policy Control Function (PCF) and Session Management Function (SMF) to apply a dedicated QoS policy for the MVIGC, ensuring guaranteed bitrate, priority, and potentially pre-emptive capabilities. The network establishes individual bearers or QoS Flows for each member of the MVIG, connecting them to a common multimedia resource function that mixes and distributes the video and audio streams. Key components involved include the MCVideo AS, the Group Communication System Application Server (GCS AS), the Media Resource Function (MRF), and the core network's policy and session management entities.

Its role is to provide an immediate, reliable, and high-quality video conference for emergency responders. The call setup is optimized for speed, often bypassing normal ringing procedures to automatically connect all members. During the call, floor control mechanisms manage who can speak or share video, and the session persists until explicitly terminated. The MVIGC leverages the group definition to ensure all necessary personnel are included and that the network treats this communication as the most critical traffic, which is essential for maintaining situational awareness and command coordination during a fast-evolving crisis.

Purpose & Motivation

The MVIGC was standardized to fulfill the requirement for an instant, video-based group communication channel that activates automatically upon the declaration of an emergency. Traditional teleconferencing or push-to-talk over cellular (PoC) solutions lacked the guaranteed priority, pre-emption, and rapid setup mechanisms needed for life-or-death situations. First responders required a system where a single alert could launch a full video conference with all relevant parties, without any manual dialing or connection delays.

MVIGC solves the critical gap between identifying an imminent peril group and actually establishing a working communication channel for that group. It operationalizes the MVIG concept. The motivation stemmed from public safety agencies' need to leverage broadband video for improved situational awareness—seeing a disaster scene, a suspect, or a building layout—while retaining the instant group connect feature of their old radio systems. By defining MVIGC as a standardized service, 3GPP ensured that different vendors' mission critical applications and networks could interoperate to deliver this vital function, enabling effective multi-agency response during major incidents.

Key Features

• Automatic or on-demand establishment of a group call for a pre-defined MVIG
• High-priority session setup with potential for resource pre-emption over other traffic
• Integrated video, audio, and data sharing within the group call
• Application of mission critical QoS profiles (e.g., GBR, high priority level)
• Support for floor control and talker identification
• Seamless integration with MCVideo service architecture and underlying 3GPP core network

Evolution Across Releases

Defining Specifications