How Do I Choose the Best Personal Pager?

Radio paging service (radio paging service) is a service in which a calling user transmits simple information to a user in one direction through a public telephone network and a radio paging system. There are audio call, digital display, alphabet display, Chinese character display or mixed display.

Chinese name: Radio paging service

Foreign name: radio paging service

Radio paging service development

China opened its office radio paging service in 1984. By the end of 1992, there were more than 2.22 million public radio paging network users, and most provinces and cities have realized long-distance "126" paging. China's wireless paging service is developing in the direction of regional networking, national networking and automation.

Since the establishment of paging network and paging service in China in 1984, the POCSAG coding system has basically been used. Therefore, a large number of paging stations used 1200bit / s low-speed or even lower 512bit / s coding scheme. The transmission rate of the POCSAG coding system is low. To increase the number of new users can only be achieved by increasing the frequency and setting up new stations. In the high-speed development stage of the paging industry, there are many problems to keep the number of users, especially when new technologies are continuously applied. FLFX high-speed paging coding is a fully synchronous, multi-rate and time-sharing coding format. The FLFX coding format uses a period of every 4 minutes, each period is divided into 128 frames, and is transmitted at a basic rate of 1600bit / s. In each frame structure, the group call user information is concentrated through the multiplexing of 1/2/4 basic frames. In one frame, high-rate transmission is achieved.

Radio paging is a one-way personal selective call system that transmits call signals, and sends selective call signals to mobile users who carry pagers. The pager is lightweight and easy to carry. At present, wireless paging has developed a lot in China, with millions of users.

Radio paging service communication method

The radio paging system consists of a radio paging control center connected to the public telephone network, several radio paging transmitters and peripheral radio paging receivers. The connection modes of the radio paging system and the public telephone network are divided into: manual connection. Accepted and continued by the operator of the artificial desk. Fully automatic connection. The call sent to the user is automatically transferred by the private automatic switchboard and a paging signal is issued.

The special service number of the radio paging service operated by the post and telecommunications department is "126" for the manual station and "127" for the automatic station. Such services operated by non-post and telecommunications departments use ordinary telephone numbers as service numbers.

Radio paging service business scope

Radio paging services can provide users with basic services and special services. Basic services. Paging users with information such as last name, message code, or public phone number. Special services. Refers to the information format where the user has special requirements for the paging service and needs to use a specific information code. For example, to provide users with financial information, stock market information, weather information, notice of arrival, and so on.

Main functions of radio paging service

The main functions of wireless paging include normal call, composite call, timed call, cyclic call, priority call, designated call, approved call, group call, roaming call, emergency call and message, query and other services.

Radio paging service system composition

A simple paging system consists of three parts: a paging center, a base station, and a paging receiver. If the calling user is looking for a certain called user, he can use the local telephone to dial into the paging station, and inform the called user of the paging number, the calling user's name, the return phone number, and short information content. The operator enters it into the computer terminal, passes the coding city system, and finally sends it out by the base station radio transmitter. If the called user is within its coverage, the paging receiver on his body will receive the radio paging signal and emit a beep or vibration. At the same time, the received information is stored in the memory and displayed on the LCD screen. At this time, the called user can obtain the transmitted information, or call the calling user to make a call. This is the case where the call center is manually controlled. If the call center is under automatic control, the entire process is performed by the computer of the paging center. In China, the frequency of wireless paging is specified as 160MHz, 450MHz, and 900MHz frequency bands, but the actual frequency used is mostly 160MHz frequency bands.

Wireless paging service networking mode

Wireless paging networking can be divided into local paging networks, regional paging networks and national paging networks.

The local paging network is the coverage of a long distance numbered area. The local paging network can adopt single-zone or multi-zone system. The service area of the single-zone system has only one base station transmitting area, that is, the paging center only has one base station. The coverage of a single base station depends on the height of the transmitting antenna, the propagation environment and the effective radiated power. For example, the height of the transmitting antenna is 50m and the effective radiated power is 100W. The outdoor coverage range is 15km in urban areas, and about 5km indoors. In rural areas, the outdoor half-length is about 25km, and the indoor is about 8km. When it is required to expand the service range, a multi-zone system can be adopted, that is, a paging center has multiple base stations, and each base station is connected to the paging center by a dedicated line for the line. Each base station adopts a mode of working at the same time, that is, the same signal is transmitted at the same time, so synchronization is required. In a multi-zone system, in order to avoid the phase difference of signals arriving at different base stations in the overlapping area, equalization is needed, and in order to avoid beat interference, a frequency offset technique is required. The paging signal sent by the paging station should be coded using a certain coding format. Currently, POCSAG codes are mostly used.
The paging receiver is small in appearance, but inside it is a complete radio receiver. Its working principle is the same as that of an ordinary radio station. Generally it consists of two parts: a radio frequency receiving unit and a logic control unit. The RF receiving unit is composed of antenna, high-amplification, mixing, intermediate-amplification and filtering, limiter amplification and frequency discrimination circuits. The logic control unit consists of a microprocessor, a decoder, a comprehensive function interface component, an address and function data memory, a liquid crystal display and a booster circuit. Generally requires small size, low power consumption, high reliability, easy to carry, and has good dustproof, shockproof and impact resistance performance. In addition to acoustic pagers, there are also digital display pagers and Chinese display pagers in the market. Now China's wireless paging has developed from a local paging network to a regional paging network, and has gradually formed a national paging network.

Features of Radio Paging Service

Radio paging is a communication method that uses radio signals to transfer information in one direction. It has three characteristics:

(1) Radio paging is a one-way communication system, that is, there is only a signal from the radio paging transmitter to the paging receiver, but no signal from the paging receiver to the transmitting station.

(2) This one-way communication uses a certain frequency radio signal as a carrier signal to transmit paging information, so it is a carrier communication method;

(3) This communication method uses the address code as the identification code for directional identification communication, that is, the information sent is only received by the paging receiver of a certain address code, ensuring the confidentiality of communication.

Application range of radio paging service

The combination of paging technology and related control technologies can produce applications such as telemetry and remote control. For example, through paging technology, you can send a control signal to a remote device. For example, you can use a paging control signal through a telephone to remotely turn on the air conditioner in your home before work. Similarly, some telemetry information can also be periodically transmitted to designated locations through paging technology. In short, the combination of paging technology and control technology can produce many new applications.

Radio paging service use procedures and billing

To use the wireless paging service, users must submit a written application to the local telecommunications bureau that operates the public paging service to uniformly verify the number. The pager is generally selected by the telecommunications department and sold to users. It can also be rented from the telecommunications bureau.

The fees charged by the radio paging service include account opening fees, service fees, and sales or lease fees.