Towards Next Generation Public Safety Network Technologies

Modern and emerging digital technologies are reshaping user expectations, and bringing many key advantages such as clear audio, greater coverage, sufficient utilization of the allocated spectrum, and extended battery life, and many other. The data capabilities as well as data capabilities are worth mentioning as the greatest benefits of broad band TETRA radio network

For instances, application such as SCADA solutions, GPS location, text messages, telemetry services, radio programming and improved safety further extends Digital Mobile Radio (DMR) two-way radios beyond voice communications. A unified operation of narrowband TETRA with cellular technology such as LTE is illustrated in the figure below.


Digital uninterrupted nature of DMR makes possible the addition of data applications on top of radio systems and devices.. Since the DMR standard supports packet switching over the air, enabling an effortless development of standard applications. In this digital era, everyone around the globe is entirely dependent upon communication both on data and voice. Therefore, this facility to include variety of data applications to the system is seen as a potential solution for mission critical communication. In this article, we have summarized the five advantages of combining data and voice under DMR.

Spectrum Efficiency in DMR Networks

The most important feature of DMR which is both operators and the regulators enjoy is the existing 12.5 KHz spectrum can be re-used to carry two TDMA timeslots simultaneously. As a result, the spectrum efficiency of DMR systems is improved significantly by a factor of two as compared to the analog systems. DMR optimizes the use of limited bandwidth and lets the reuse of existing spectrum providing an uninterrupted digital communication. Moreover, expanded communication bandwidth which enables digital audio quality and higher calling capacity.

Future TETRA Radio and DMR Systems Throughput

In DMR systems, the spectrum is divided into two TDMA timeslots. Specifically, in the first time slot when voice is utilizing, the second time slot can be used to transmit application data like text message or location data simultaneously together with the ongoing call. It is effective in applications such as public safety dispatch systems which provide verbal as well as visual transmit instructions. With the rise of Internet-of-Things (IoT) and Big Data, enhanced data capability of communication networks has become very important. The future plan for two-slot TDMA applications in DMR is to provides ability for temporarily merging of the both slots to the data rate to 9.6 Kbps. An illustration of state-of-the-art mission critical services over broadband networks is shown in figure below.


Improved Responsiveness for Public Safety Networks using DMR systems

 A combination of voice and data in one device gives field and mobile users with every bit of information that they might need.

The facility of combined voice and data in a single device provides field and mobile workers with all the transformation that are needed for efficient react and respond to any condition.

DMR supports multiple call types, including group system, system emergency, announcement and unit-to-unit calls, and data messaging, including status, short and authenticated registration, making certain that consumers communicate in a wide range of different ways.

This enhances the productivity and safety standards of the workers who operate in remote environments.

Secure Emergency Communication Services using DMR systems

DMR infrastructure puts a great emphasis on security. DMR Tier III ensures privacy in communication by providing security features of data and voice communication. High level of standard supports are used for access control for devices, encryption techniques, full sorting of traffic, user authentication and network access. With the introduction of trunked call handling in DMR, prying is not possible.

Next Generation Scalable Public Safety Networks

Digital Mobile Radio communication provides a good way to increase workforce efficiency and obtain maximum operational benefits for mission critical users. We need a digital radio platform which can help to reduce the network outages and improve power communication while guaranteeing that your assets and staffs are protected and performing optimally.  The Organizations are now realizing the benefits of bringing voice and data together over DMR network which can be delivered to the whole grid. In essence, DMR Tier III is the right platform to build a fully connected and secure enterprise with enhanced voice and data services, along with location services and vehicle telemetry communications.

We have designed a comprehensive course regarding DMR and TETRA Radio network planning and design for public safety networks. You can join our TETRA Network Evolution to LTE Broadband for Public Safety Communication Certification Courses here.

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