How to Implement a Dispatch Solution with DMR

19 Oct. 2016   Information

Innovation in digital mobile radio (DMR) has allowed organizations affordable, functional dispatch systems complete with voice, data and other supplementary services.The DMR radio standard is proving a force to be reckoned with in the digital Professional Mobile Radio (PMR) market. It has become the technology of choice across a number of market verticals and across the globe.
To gain maximum value from a DMR system, you need to complement your network with a modern and full featured dispatch console. Before finalizing your network design, it is important to consider your dispatch console system and how best to integrate this as part of the overall solution. There are five key questions that should be asked to ensure you get the most out of your network and maximize the return on your investment.

Q1: What console features will help you get the most from your investment?
The DMR Association has approved a protocol for use by dispatch consoles in either Tier II (conventional) or Tier III (Trunking) systems. This protocol is known as “AIS” and provides a common and well‐defined way for a console to interface with a DMR‐compatible radio. A console system that supports AIS will ensure that your organization can access the most beneficial features of DMR. Almost all console systems that are designed for use with digital radio use PC based dispatch workstations.
Therefore, before choosing a console system, you should assess what dispatch features would add value to your operations – now and in the future – and check that the console can support these features.
Location Services through GPS: Digital radios can periodically transmit GPS coordinates so you always know where your assets are – whether they are people or vehicles. Your assets can be displayed on a map. You can choose from basic Real‐Time tracking to advanced asset management complete with Geofencing, speed control, logging and trace routing.
Emergency Management: The ability to generate Emergency and Blast Tones across the network to alert users to a dangerous situation.
Text Messaging: This is very useful for communicating non‐urgent information or for use in noisy environments.
Remote Monitor: Dispatchers have the ability to remotely activate the microphone of a radio user and have that user’s audio discreetly monitored. This is an important feature when you are concerned about a user’s wellbeing and safety.
Stun Kill: The dispatcher can temporarily or permanently disable a radio in the field. This is useful if the radio is lost, stolen or generating faulty transmissions.
Rapid Recall: A dispatcher can immediately playback conversations, in whole or in parts, during and after received calls. Radio users do not need to repeat key information and dispatchers can re‐check facts themselves.
Integrated Contacts: Users on a DMR network can have their own ID and belong to one or more talk groups. An integrated contacts function will ensure that people can be contacted easily and identified quickly.
Call Logging: By keeping a history of recent and missed calls, dispatchers may never miss important requests and notifications.
Linking or Patching: The ability to create links with radio users on one channel or talk group with those on another. Linking can also be used to interconnect DMR and other technologies (such as legacy analog).
Phone Connectivity: The ability to integrate telephones into a system can be useful for both dispatchers and radio users. For a dispatcher, the ability to communicate with the phone system and the DMR network, using the same headset equipment, can be very useful.
Ease of Use
In order to get the most out of your dispatch solution, it should be simple for operators to use. A few options you may want to look for in a dispatch console to achieve this include:

Q2: How will you connect to the DMR infrastructure?
Although the DMR Association has recommended a protocol for dispatch communications over IP, not all radio manufacturers will support this interface. Some will provide alternative interfaces (which may or may not include IP) and sometimes the IP method itself will not be suitable.
One of the advantages of the AIS protocol for DMR is that it enables dispatch consoles to connect to an Ethernet port on Base Stations or Repeaters and communicate using IP. This method greatly simplifies installation and provides significant cost savings. In addition, an IP connection enables the console to be physically separated from the DMR system but connected using standard IT equipment.
If the radio supports both DMR channels then the console should be able to access those channels simultaneously and both voice and data are carried over IP.
When choosing IP as the method of connectivity, the IT professionals at your organization should be consulted. There may be certain restrictions on how you can connect using this method such as what addressing methods you can use. Additionally you will need to ensure that there will be sufficient bandwidth to transmit voice and data. Is voice able to be given priority to ensure that critical communications are not lost?
Donor Radio
An alternative to using a direct IP/Wireline interface to the Base or Repeater, is to use a donor radio. This method is useful in a couple of scenarios:
Donor radio interfaces usually involve two separate connections: a USB connection for data and call control, and an analog connection for voice. The use of donor radios can become a problem if an organisation requires many channels. This is due to the increased cost of installing antennas and other ancillary equipment, which can quickly outweigh the cost savings of using a mobile radio rather than a Base.
Whilst most DMR radio equipment, with IP, will allow the console to access both DMR channels, a donor radio can only ever access one channel at any one time. Therefore, two donor radios are required in order to provide the same dispatcher coverage as an IP equipped Base or Repeater.

Q3: How will you manage the migration?
The migration from Analog to Digital can be quite a complex process and many organizations cannot tolerate having any down time to accommodate this. Furthermore, the cost of replacing all of your equipment at one time can be daunting. Many organizations prefer to spread the cost across multiple budget periods.
The key to migration is to ensure that your dispatch console system employs Radio over IP Gateways. RoIP Gateways connect the dispatch system through to the other radio resources and there are differing gateways for different radio systems. They enable the dispatch system to handle different protocols from different radio vendors, allowing dispatch operators to communicate over different radio networks in a transparent way.
This is how you can connect to both analog and digital radios, and migrate from analog to digital or from one technology to DMR. An example of a process could be:
1. Connect all of your existing Analog radios onto an IP network using Radio over IP (RoIP) Gateways;
2. Upgrade and configure your Dispatch Software to connect to both the legacy and DMR network simultaneously. Depending on the choice of Dispatch Solution, you may also be able to create links between the technologies so that you can better integrate the technologies;
3. Upgrade one site, region or functional area at a time by adding gateways to suit the type of radio.

Q4: What type of dispatch solution should you use?
The type of dispatch solution and how it is implemented can have an impact on performance, administration, maintenance and reliability. Understanding the benefits and drawbacks of various architectures is essential for avoiding potential issues down the line. Here are some key considerations:
Q5:  What costs do you need to be aware of?
At some stage in the design process "price" is going to come into the equation. Price may include more than just the cost of the equipment. Like buying an airline ticket, you need to dig deep to understand exactly what you will be getting.
Here are some key considerations that can help you work out if you are getting the best value for your purchase:

DMR is a technology that can provide you with affordable digital communications of low complexity, complete with voice, data and other supplementary services. To maximize the value of your DMR system, you may choose to add a full featured dispatch console. However, the dispatch console should not be considered an afterthought.

(Source:Omnitronics’ whitepaper – 5 Questions to Ask Before You Implement a Dispatch Solution with DMR )
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