Wireless paging network for wireless paging

Wireless paging network consists of local wireless paging network and regional wireless paging network. Structure and system composition of local wireless paging network

1. Structure and system composition of single-zone wireless paging network

Structure and system composition of (1) single-zone wireless paging network with manual connection.

The whole service area is the base station transmitting area. The base station and the paging center are connected through a two-wire dedicated trunk circuit, and the paging center is connected to the local telephone terminal office and/or the local telephone tandem office through a trunk line. The wireless paging service desk in the paging center is equivalent to the dedicated service desk in the local telephone automatic switching network. If it is necessary to open remote paging service, the paging center can access the long-distance office through the long-distance trunk line.

(2) The structure and system composition of single-zone wireless paging network with automatic connection.

The wireless automatic paging center is connected to the tandem office or end office of the local telephone automatic switching network through a relay, and connected to the base station through a two-wire dedicated relay circuit. Wireless paging system consists of wireless automatic paging center, base station and paging receiver. Wireless automatic paging center consists of automatic paging terminal, paging data processing center and modulator. Among them, the automatic paging terminal mainly consists of a relay interface unit, a recorder, a customer number checker and a voice mail box. The data self-care center is mainly composed of queueer and encoder, and the base station is mainly composed of demodulation transmitter and antenna.

2. The structure and system composition of multi-area local wireless paging network.

Structure and system composition of (1) multi-zone local wireless paging network with manual connection.

Each base station sends the same signal at the same time, so the working mode of each base station transmitter is synchronous. In order to enable each base station to transmit signals at the same time, it is necessary to select a base station as the central base station, and take this as a benchmark, and the signals of the surrounding base stations are synchronized with the signals transmitted by the central base station, thus ensuring reliable reception. The coverage of multi-area wireless paging network can be autobiographed to the service scope of local telephone network.

(2) The structure and system composition of multi-zone local wireless paging network with automatic connection mode.

The wireless automatic paging center is connected to the tandem office or end office of the local telephone automatic switching network through a relay circuit, and is connected to each base station through a two-wire dedicated relay circuit. Structure and system composition of local wireless paging network

There are several networking methods for regional wireless paging networks.

1, roaming networking

In order to enable the customers in this system to enjoy the paging service in this system (or some systems), all paging systems in an area can formulate unified paging customer numbers through agreement, and these customer numbers can be regarded as "authorized" in the whole area. Once the customer enters other systems outside the registered system, other systems can also provide paging service for the customer. This roaming network system is relatively convenient to implement. Generally speaking, individual systems do not need to be published, but strictly speaking, they are not a kind of networking. There is no connection between the systems except the pre-established numbering plan.

2. Regional simulcast network

Regional simulcast networking, that is, each page is broadcast simultaneously in the whole area, so customers can enjoy paging service in the whole area. There are usually two ways to realize this kind of simulcast system.

(1) Remote terminal mode. In this way, a regional networking is formed, and the whole region is actually an independent paging system. The system is located in the central city of the region, including a host computer, a centralized encoder transmission system and some terminals. Other counties and cities in the region only have terminals and transmission systems. The remote terminals in each county and city are connected to the host computer in the central city through interface devices and lines, and the host computer sends the centrally coded codes to the transmission systems in each county and city, so that each message can be broadcast simultaneously in the whole region through the delay equalization circuit.

(2) Single system mode: The difference between single system regional simulcast system and remote terminal simulcast system is that each county and city has its own independent paging management system. The local terminal is not directly connected to the host in the central city, but connected to the local host, and the information is transmitted to the host in the central city through the local host. After unified coding, it will be distributed to various launch systems to realize simultaneous broadcasting.

3. Regional networking of different broadcasting modes

Different broadcast networking systems can set up special networking hosts in regional central cities and connect with the hosts of individual systems through interface devices. For local information, that is, information broadcast only by local customers in the local system, it is only sent to the local transmitter system through the encoder in the local system for transmission. Information that networked customers need to send this information in the whole area can be sent to networked hosts through local hosts, and then forwarded to hosts in counties and cities through networked hosts, and then encoded and transmitted locally. In this way, the transmitters in counties and cities only undertake the transmission of local information and a small part of networking information, which greatly increases the capacity of networking systems. At the same time, because there is no need for a unified regional code, all counties and cities only need one line to connect with the central city to realize regional networking. For individual counties and cities with the same frequency interference, it can be controlled by networked hosts to make them cross-transmit, so as to eliminate the same frequency interference.