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Interoperability


Partner content

MCPTT interworking for critical communications

MCPTT interworking for critical communications

  • Written by Ildefonso de la Cruz / Light Reading
  • 26th January 2023

The goal of mission-critical communication systems is to minimize the response time of first responders in emergency situations across several agencies. A dedicated push-to-talk button offers an efficient mechanism that simplifies the speaker-to-listener process to a minimum. This feature is useful when coordinating large group activities and to enable the instant flow of tactical status and commands with minimal overhead and latency. Wireless radio push-to-talk represents the foundation of mission-critical communications, enabling the exchange of voice information with a group of listeners in a quick, reliable and effective way.

From PTToC to Mission Critical PTT

Push-to-talk over cellular (PTToC) technology has come far since its early days. The evolution and technology refinements of LTE reduced round-trip latency and boosted data capacity. Just as important, mobile network operators have aggressively expanded LTE coverage across large geographic regions, delivering nearly ubiquitous coverage. This combination of high performance and ubiquity offers a solid solution fit for the stringent requirements of the critical communications user community.

The demand from first responders for bandwidth-rich critical applications is driving governments to establish dedicated LTE/5G mobile data networks to serve public safety and other agencies’ mission-critical requirements. Selecting the appropriate implementation of the PTToC protocol is a fundamental step in the design of the national critical networks of the future.

Nowadays, the PTToC market is dominated by generalized proprietary solutions. However, there is an emerging range of new PTToC options. Long-standing PTToC approaches based on over-the-top (OTT) protocols now coexist with new 3GPP-based offers embedded in the LTE network architecture to support mission-critical-grade optimization and a feature-rich suite of services. This 3GPP-based group, known as Mission Critical PTT (MC-PTT), has caught the attention of the public safety community due to its higher level of reliability and performance guarantees.

To achieve the required performance, network-integrated MC-PTT servers are hosted within the mobile network operator (MNO) architecture or with a standalone private core network. Data traffic over the network is marked with standardized QoS Class Identifier (QCI) values that provide preferential transmission during congestion in the core or radio access network on mission-critical LTE networks. The combination of network-integrated MC-PTT with MC-LTE forms the basis for most government PTToC deployments. Following the steps of FirstNet in the US and Safe-Net in South Korea and their MC-PTT solutions, multiple new government programs to establish mission-critical public safety broadband networks are progressing across Europe, Canada, Australia and New Zealand. These programs will reshape the PTToC market and thus reduce the dominance of simple OTT protocols.

Network-integrated standard MC-PTT deployments have focused on government public safety deployments. But several commercially oriented services are now available to enable critical communications in industry verticals (e.g., manufacturing, mining, utilities, transport, etc.). MC-PTT network integration is, however, complex, and the procurement processes are challenging. To reflect this issue, Omdia forecasts the most dramatic increase of MC-PTT users in the 2026–30 timeframe.

To read the complete article, visit Light Reading.

 

Tags: Standards 5G Broadband Push-to-X Critical Infrastructure Enterprise Federal Government/Military Funding Interoperability Land Mobile Radio Long Term Evolution (LTE) News Policy Project 25 Public Safety Public-Safety Broadband/FirstNet State & Local Government System Design System Installation System Operation Wireless Networks Partner content

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