The development of radio technology in 30 years, the simulation technology has become so mature, devices have been very reliable, can satisfy the Xianyoukehu the basic needs of consumers Qunti, Ke Yi Shuo's development in multiple vertical industries made great contributions. However, with the socio-economic and technological development, many government departments, police, public safety, utilities, medical, fire and special departments of the mobile terminal has been made more professional, secure, stable, healthy, convenient requirements .
20 years ago, some people abroad will be the introduction of digital technology, radio industry, currently the most widely used worldwide, most of the digital trunking system users as the standard in Europe and the United States iden tetra standard. End of 2000, Ministry of Information Industry has approved the two standard reference for our clusters on the standard, and announced China's "digital trunking mobile communication system" standard, allowing manufacturers to use and develop our country such cluster systems and terminal equipment.
1, digital trunked radio and analog (conventional) radio comparison
Digital trunking radio and analog radio than the voice clear and steady to receive call signals, digital radio for analog radio can not only basic operations: a single call, group call and other functions, also has a dispatcher verification calls, regional options, access priority, priority call, after the late entry, pre takes precedence call, listening, dynamic restructuring, monitoring and other supplementary service. In other words, the digital trunking radio can provide richer types of business, better service quality, better privacy features, better connectivity and higher spectral efficiency.
Second, digital trunked mobile radio and civilian comparison
Although the civilian world, the basic business and to add mobile phone business has diversified, the fastest transfer rate can reach 9.6kbit s to 2mbit s; but the user only for the general users of mobile communication services, and by market sales, manufacturing costs, can not satisfy the other part of the special professional users of mobile terminals, high privacy, unified control capabilities.
tetra digital trunking terminals can not only make the public network with telephone, data transmission (short message, the state news report), caller ID and other services, but also radio calls, listening, pre-accounting priority cell selection and other functions. Have tmo and dmo two modes of operation. In addition, the digital trunking radio's screen resolution, color, interface design can be personalized with the most popular mobile phone rival, a more perfect combination of the advantages of mobile phones, but we can not simply say that digital trunking radio analog walkie-talkie and cell phone combination.
Such as tetra digital trunking terminal unique encryption technology (end to end encryption, encryption empty, empty Authentication) for specialized departments to effectively prevent outside attacks and hackers of unlawful interference; accurate gps global positioning technology to use for the user's personal safety and timely response critical juncture provides effective protection; unified dispatching operations to distance away to death, to restore the terminal's work.
With the cluster network in the world and rapid growth, digital terminal will be in the future development of large-scale use. According to European and American market research: in 2003, digital radio and analog radio ratio is 2:8, the ratio became 5:5 in 2004, forecast to 2007 the ratio will be 8:2. Authority of the State Department, according to forecasts, China's digital trunking system, the potential market demand of about 800-900 million units in the mobile station, channel 14-15 million, up 50 billion yuan output value. Digital trunking network in which shared 10 years up to 4 million users. In terms of international common estimation methods, ie the professional mobile user mobile users one-tenth of the public estimation, by 2010, China's public will be more than 230 million mobile users, when the professional mobile users will increase to 2000 - 30 million. In recent years, tetra trunking system has been widely used in China's public security, transportation, manufacturing, energy, water, social services, education, military, etc., the current projects under construction and build a total of 49, totaling about 700 million yuan RMB mainly in public safety and transportation industries. Some large and medium cities in China such as Beijing, Shanghai, Guangzhou, Shenzhen, Nanjing, Chengdu and other cities have already installed the cluster communication network, and experience the advantages of digital services to mobile terminals. This shows that digital trunked radio is the future direction of development of the wireless communications market in the world with the majority of potential users.
As the foreign in the cluster system of digital trunking terminal began earlier, after a long period of accumulation of product development has been more mature. Our manufacturer only learn the advanced experience of foreign countries, combined with its own characteristics in order to rapidly develop its own digital radio products. Although the digital trunking radio is good, but expensive development and testing environment, to other parts of the country or the world (excluding Europe and the United States outside) to open up the market to replace the simulator there are many way to go.
Therefore, domestic demand in the current circumstances, to determine the phase-out analog radio, digital machines to replace some other issues still too early. Analog radio costs less mature and stable technology, you can basically meet the tourism, hotel, railway and construction industry communications requirements in the domestic market still has a radio, most of our customers.