Analysis of Digital Trunking Mobile Communication Network System
Abstract: The problem of upgrading cluster communication from analog to digital and the localization of the digital cluster industry has become a hot topic in the industry. The market demand in the field of wireless trunking communication is constantly changing, and users hope to enjoy more integrated trunking communication services and richer trunking services. The article briefly introduces the network operation system of digital trunked mobile communication.
Introduction The development of cluster communication systems in China has gone through more than 20 years. From the perspective of market application, more than 20 years is a cycle of new technology starting, maturity, and even being replaced. In recent years, several topics have been discussed on cluster communication, from analog to digital, from shared private network to private private network, from system standards to technological innovation, from enterprise research and development to market applications, from social needs to emergency linkage communications, etc. This paper intends to make some superficial discussions on the digital trunking mobile communication network system.
1. The concept of cluster communication network The cluster communication system is a multi-purpose, efficient and cheap advanced wireless dispatch command system that shares resources, shares costs, and provides excellent services to users. It is very suitable for enterprises, undertakings, industrial and mining, oil fields, farms, public security, armed police and military and other departments with high requirements for command and dispatch functions. Control etc. At the same time, the definition of transmission cluster, quasi-transmission cluster and information cluster are also proposed for cluster communication.
With the development of cluster communication and the needs of users, cluster communication has also transitioned from the original analog cluster to a digital cluster. But this transition is not simply to convert the original analog voice into digital voice and provide data transmission function can be called digital trunking. In fact, looking at the digital clusters proposed internationally, the standards of digital clusters are developed and proposed around the needs of users.
2. Operation of digital trunking mobile communication network Digital trunking communication is the third largest battlefield after mobile phones and PHS. It is becoming the new focus of development in the field of telecommunications, and operators and equipment vendors are starting a new competition. In the design, it meets the needs of professional wireless users and is particularly suitable for use in private networks in the government and commercial fields.
2.1 The standard TETRA (Terrestrial Trunked Radio) system of digital trunking communication is used in commanding and dispatching. It can complete the communication of voice, circuit data, short data messages, packet data services and the direct mode of the above services, and can support a variety of Additional business. Under the conditions of the regional system, the maximum coverage radius is 56 kilometers. TETRA expansion can gradually increase the modularity and is suitable for small, medium and large-scale scheduling systems; the design of the network is flexible, suitable for both dedicated scheduling networks and shared scheduling networks. TETRA voice coding adopts algebraic structure codebook excited linear predictive coding, which has good voice quality and can be heard clearly even under the interference of strong background noise. The voice quality is not reduced as the frequency modulation system weakens with field strength. A large number of experiments prove that the voice quality of TETRA system is better than that of GSM system. Therefore, it is widely used in emergency, dispatch, command and other private network application systems.
The iDEN (Integrated Digital Enhanced Network) system is a dispatch communication / cellular duplex telephone combination system based on the TDMA multiple access method. It absorbs the advantages of digital cellular communication systems on the basis of traditional large-area dispatch communication. For example, the dual-mode mobile phone method is used to enhance the telephone interconnection function; the cell multiplexing cellular structure is used to improve network coverage. The selection of this code is advanced, but the technical openness is not good and the price is relatively expensive. But the call quality and confidentiality are better. [
2.2 The equipment security of digital trunking system is the foundation of the network, and the safety of the equipment is the foundation to guarantee the safety of the network. Only by guaranteeing the physical reliability of the network can the safety of network functions and information be guaranteed, so the reliability of the basic equipment is very important.
For switches, hot backup of key components should be implemented on the hardware. On the software, key user data and configuration data should be backed up in a timely and regular manner. For the base station system, its anti-interference ability must be considered, such as radio frequency interference, lightning strike, and seismic performance. The backup power supply of the base station system should be properly equipped according to the importance of the coverage area of ​​the base station to respond to emergencies. The system's primary and secondary switching capabilities are an important indicator of system reliability, such as the switching time and the impact of the switching process on ongoing services. A complete monitoring and alarm mechanism can greatly improve the reliability of the network, such as system components can self-diagnose and repair, the system can isolate faulty modules, and generate alarm information in time. In addition, the dispatcher desk and terminal store important user information. These devices are controlled by the user and should be maintained by dedicated personnel to ensure that relevant user information is not stolen by the outside world.
Digital trunking communication system is a special dedicated communication system. It plays an important role in social stability and the safety of people's lives and property when responding to emergencies. Therefore, the security requirements of digital trunking communication system are much higher than the public For mobile communication systems, operators of digital trunking communication systems must consider how to enhance the system's ability to resist catastrophes and how to make the system transmit information more safely and reliably. Only by paying full attention to the security issues of digital trunking communication system can the digital trunking system play its due role.
3. Future development direction of digital trunking communication technology 3.1 High-security digital trunking Between the base station and the mobile phone, information is completely dependent on the transmission of radio waves, it is easy to be intercepted by people from the air, and it will leak in the call state and standby state, even if the radio is turned off Using modern high-tech, it can still be opened remotely, continue to eavesdrop, intercept, destroy, exchange, counterfeit and embezzle communication information.
3.2 Highly invulnerable professional mobile communications may encounter malicious destruction of human factors or natural factors such as rain and snow disasters during the use process, resulting in the network not working properly. Therefore, the future PPDT system requires reliable and accurate service provision, with high Invulnerability and availability. Normally, the system works in cluster mode; in extreme cases of harm, the system works in weakened mode or through mode to ensure that the system can meet the basic cluster business needs.
3.3 High environmental adaptability professional mobile communicationBecause it is used in the surface and space of the world, it will encounter various harsh climates, terrains and environments; therefore, it is required that the communication equipment must be able to withstand the harsh weather such as extreme heat, severe cold, strong winds, heavy rain Conditions; must adapt to different terrain environment conditions in three-dimensional space such as mountains, jungles, deserts, rivers and seas, high altitudes; can be installed on board and can be carried on the hand, and must withstand the mechanical conditions of various mobile installations; in noisy In a noisy environment, it is necessary to have a background noise filtering function, so that the other party of the call cannot hear noise interference and the voice is clear; when driving at high speed, communication cannot be interrupted, quality cannot be reduced, and high-speed operation of 500km / h can be supported.
4. Conclusion After all, the cluster common network has its own shortcomings, that is, these common networks often have relatively weak scheduling functions, even if the common network is built using the same system as the private network, it will also relatively weaken the scheduling function. . Those scheduling systems developed on the basis of the public network have added scheduling functions to the original system protocol and structure.Because the original system, protocol and system structure were established based on the public network's telephone service, think It can fully meet the needs of professional users for private networks, which should not be reached at present.
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