Recently, the Ministry of Industry and Information Technology issued a notice on adjusting the frequency use plan of the digital trunking communication system in the 800MHz band (hereinafter referred to as the notice). The relevant contents of the notice are now interpreted as follows:
What is a digital trunking communication system
Digital trunking communication system is a mobile communication system that uses digital modulation technology to achieve frequency resource sharing and wireless channel dynamic allocation functions. It is mainly used for command and dispatch. Digital trunking communication system mainly provides users with special services such as group call, emergency call, monitoring, priority call, etc. that cannot be provided by public mobile communications. It is widely used in airports, ports, urban rail transit, city management (public security, fire protection, Water conservancy, civil air defense, emergency, government affairs) and other fields.
Why should the notice be made?
In 2007, the former Ministry of Information Industry issued the “Administrative Regulations for 800MHz Digital Trunking Communication Frequency Stations (Station No.  No. 173), which explicitly identified TETRA, iDEN, GoTa, and GT800 as the domestic 800MHz digital bands. Cluster optional technology system. With the development of technology and market, the digital trunking communication technology system is also constantly evolving. At present, digital trunking communication systems based on iDEN, GoTa, and GT800 technologies are gradually withdrawing from the market, and related companies have discontinued the production of these devices. In the 800MHz frequency band, only digital trunking systems based on TETRA technology have been widely used in China's government affairs special network, rail transit, airports, ports and other fields. At the same time, dedicated digital trunked communication system (PDT) technology has been widely deployed in other frequency bands.
Taking into account the fact that the user system of the 800MHz band industry can choose a single digital trunking technology system, the introduction of PDT technology on the basis of retaining the widely used TETRA technology in the 800MHz band will help further meet the social demand for digital trunking communications and promote new The development of new technology applications, improved spectrum allocation flexibility, fully introduced market competition, reduced user costs, and promoted the healthy and rapid development of China's digital cluster communications industry.
What are the main contents of the notice
The main content of the notice: First, the 800MHz frequency band was newly added for the PDT technical system, and it is no longer planned for the iDEN, GoTa, and GT800 technical systems; the second is the national and local radio regulatory agency frequency licensing authority; the third is clear The requirements for frequency permission, networking mode and frequency utilization rate; the fourth is to clarify the equipment management mode. Handheld stations and vehicle-mounted stations refer to the management of ground public mobile communication terminals without the need to obtain a radio station license, which further simplifies administration and decentralization; five is clear. Relevant system transition policy stipulates that starting from January 1, 2020, no new radio transmission equipment type approval applications based on iDEN, GoTa and GT800 technical systems will be accepted, and new frequencies based on the above technical system will no longer be accepted. Application for a license, the relevant digital trunking communication system equipment and terminals that have been licensed can be used until they are scrapped; Sixth, the radio frequency index requirements of the relevant technical system have been issued.
What are the concerns in the notice
The first is that the 800MHz digital trunking communication technology system is unified to TETRA and PDT, and the channel bandwidth is adjusted to 25kHz and 12.5kHz. The second is that the 800MHz band digital trunking communication system should be deployed in cluster networking mode in principle. No direct mode or The conventional message transfer mode is used as a daily communication method. The third is to clarify the frequency usage requirements. The 800MHz band digital trunking communication system must have a frequency band of not less than 70%, an area coverage rate of not less than 50%, and a user load factor of not less than 50%. The annual time occupancy is not less than 60%; the fourth is to clarify the license-free management of handheld and car stations; the fifth is the frequency (816-821 / 861-866MHz) licensed by the locality without the need to report to the national radio regulatory agency for approval before licensing .