Major DMR Tier 3 Standard Update Released
Monday, November 02, 2015 | Comments

The European Telecommunications Standards Institute (ETSI) released version 1.7.1 of the Tier 3 trunking part TS102 361-4 of the Digital Mobile Radio (DMR) standard. The substantial update represents not only a 25 percent increase in page count of section four of the standard, but also contains major additions requested by users of the technology.

Additions include dynamic group number assignment, mobile station (MS) to MS duplex for voice and data, transmit interrupt routines and an additional mode for application data over an IP bearer service.

“We are very pleased with this major update to the Tier 3 trunking capability of the ETSI standard,” said Mario Micheli, chairman of the DMR Association. “It not only shows the dedication of the manufacturers of DMR equipment to further enhance the functionality of DMR, it is also a true sign of widespread adoption of the DMR technology. Users are asking for more capabilities, because they wish to use DMR in their business critical applications in a wider variety of use cases.”

Micheli said the update demonstrates the important role the DMR Association’s technical working group (TWG) plays in supporting and developing the standard further. DMR member companies joined forces in the TWG of the DMR Association to discuss and prepare the technical solutions eventually entering the standardization process of ETSI’s RTS/ERM-TGDMR-315. The various enhancements were discussed and defined over a period of more than a year.

Dynamic group number assignment (DGNA), talk group subscription and talk group attachment handling over the air interface were added to increase the flexibility of one of the key advantages of narrowband professional mobile radio (PMR), which is efficient group call communications. For efficient workload management, “one-to-many” communications is imperative. DGNA improves the flexibility of group call modes offered by DMR Tier 3.

MS to MS voice and data duplex required the introduction of additional timing modes for the trunked system control channel (TSCC), specifically when used on single RF carrier base stations. This improves convenience for the users, speeds up data transmissions and allows users to exploit the deployed infrastructure in lower traffic areas more efficiently without losing functionality.

Transmitting application data over a defined IP bearer service allows users of DMR systems to integrate their wireless infrastructure more tightly into the IT infrastructure and offers manufacturers the possibility to provide a bearer service for customer specific data.

The new standard can be downloaded at the ETSI website at

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