Digital walkie-talkies have a vast market in China, but they have not been reasonably developed. The introduction of a series of national policies paved the way for the development of digital walkie-talkies.

Broad Market Prospects The market is the first major issue concerning the development of digital walkie-talkies. Digital walkie-talkies should have a reasonable price that users can accept.

That is a good price. China's walkie-talkie market is relatively broad: Many professional departments cannot build digital trunking communications networks, for example, the majority of grass-roots units and units. Their working space is small and their staff is small, but their demand for communications services and functions is high. In this situation, the digital walkie-talkie becomes a better choice. In addition, small and medium-sized airports, small and medium-sized ports, railway stations, national grids, coal mines, oil and gas fields, and construction sites are also typical places for digital walkie-talkies.

According to the relevant personnel of the Ministry of Railways, although the railway has already adopted the GSM-R system, there are still a large number of station and station communications requiring digital intercom equipment. Both the public security and armed police believe that digital trunked communications networks are usually built in large and medium-sized cities, and that a large number of people working in grassroots and remote areas can only communicate using digital walkie-talkies. In fact, not only these departments need to use digital walkie-talkies. There are nearly 160 civil aviation airports in the country (up to 240 in 2020). There are only a few dozen of digital trunking communication networks to be built. Most small-scale airports with few flights only need digital walkie-talkies to meet the requirements. . In addition, more than 160 ports across the country are similar to civil aviation.

Policy Promotion Market Before September 13, 2007, the Ministry of Information Industry issued the “Notification of Document No. [2007] No. 81” on the “Notice on the Release of Radio Frequency Technical Specifications for Digital Radio Systems (Trial)”, although this is a trial. The document, but at the time, also made it possible to start and develop our digital walkie-talkie.

The radio specifications of the digital walkie-talkie determined in this document are applicable to three frequency bands of 137 MHz to 167 MHz, 403 MHz to 425 MHz, and 915 MHz to 917 MHz, and the use of two channel spacings of 12.5 kHz and 6.25 kHz. The former is a TDMA2 time slot, and the latter is an FDMA (single). road). Actually, when this document was issued, there were only a dozen models of digital walkie-talkies authorized through China’s non-commissioned model, including several digital walkie-talkie products from three foreign companies including Motorola, Kenwood and Aikemuo. There are only two digital walkie-talkies.

However, with the support of the state's policies, the development and production of domestic digital walkie-talkies, as well as the development of chips and software have all been activated. For example, the self-developed sub-band sinusoidal excitation linear prediction (SELP) voice codec series (including 2.4kb/s, 1.2kb/s, and 600b/s) introduced by the Department of Electronic Engineering of Tsinghua University has matured.

After continuous investigation, the Radio Administration Bureau of the Ministry of Industry and Information Technology released on December 12th, 2009, the official Ministry of Industry and Information Technology [2009] No. 666 document “Ministry of Industry and Information Technology on the frequency planning of 150MHz 400MHz frequency band dedicated walkie-talkie”. Use Notice of Management Related Matters.

The walkie-talkie is the last system in China’s mobile communication system that turns from analog to digital. The Director of Radio Administration Xie Feibo pointed out at a digital walkie-talkie forum: “Although the digital walkie-talkie market is much smaller than 3G, its social benefits and status are very important.” He specifically emphasized the fight against ice and snow. Important role played by dedicated mobile communications in earthquakes and earthquakes. Xie Feibo also pointed out that as the prices of walkie-talkies are getting lower and lower, there are more and more users. Therefore, the jamming of the walkie-talkie on civil aviation, military aviation and railways has frequently occurred. This has already caused the attention of General Secretary Hu Jintao. Digital walkie-talkies must be stable and reliable, reliable and reliable. Not only consider the market but also consider safety