Views: 17 Author: Site Editor Publish Time: 2019-10-28 Origin: Site
The PDT digital trunking wireless intercom system uses a large-area system, and usually covers a large area with fewer base stations. However, in the city, due to the blockage of the building, the signal coverage of some regional cluster wireless intercom system is not ideal, especially in the area where the density of residential buildings is large, and the area of the handshake building is more, the coverage of the wireless intercom system is even worse. In some areas, the original villages have been turned into key areas. These areas have not been built with base stations. Nowadays, many high-rise buildings and industrial parks have been built, which has made these areas a weak signal area.
In the cluster wireless intercom system to solve the problem of signal coverage blind spots, the usual means is to increase the base station complement point. However, after the supplement, it will face the problem of tight frequency resources. Although there are sufficient frequency resources, there will be a shortage of frequency resources in the signal blind zone of the main urban area.
In order to solve the problem of insufficient frequency resources brought by the urban signal supplement point, it can no longer rely on the traditional cluster technology solution to solve.
If in the digital trunking wireless intercom system network, new base stations are added to the areas that need to be supplemented, the configuration of these new base stations is exactly the same as one of the base stations in the network, such as the number of channel machines, the frequency point configuration, etc., and these new base stations It can also work together in the current digital trunking wireless intercom system network like a standard base station. Then these newly constructed special base stations are similar to the combination of multiple base stations. For the digital trunking wireless intercom system network is equivalent to one base station, their frequency points are exactly the same. We refer to this scheme technology as the group base station scheme.
The group base station is a group of base stations with the same parameters forming a base station group to jointly complete the enhanced coverage of the wireless signal in a certain area. These same parameters include: the same number of carriers, the same carrier frequency, and the same control channel. For the walkie-talkie, all the base stations in these base station groups are actually equivalent to one base station, and the functions implemented are the same as those in a standard base station. The area composed of these base stations is called the group base station area, that is, the same frequency area. In a PDT digital trunking wireless intercom system network, there may be multiple group base station areas like this, that is, there are multiple co-frequency zones.
A group base station is a group of standard base stations with the same parameters and a base station group. The same parameters include: number of carriers, carrier frequency, and control channel. Therefore, there is no difference in hardware between the base station and the standard base station in the group base station, but the configuration and functions are as follows:
① The frequency is the same. The frequency points used by the base stations in the group base station area are identical;
② GNSS indicators require higher than standard base stations. All base stations in the group base station area do not make this request after the GNSS loses lock and the crystal oscillator is punctured for 24 hours;
③ Some functional group base stations are not supported. Most functions of the group base station and the standard base station are consistent, and some functions are not supported, such as interference detection, base station recording, and the like;
① In addition to the same-frequency simulcasting function, the group base station has rich cluster service functions.
② All base stations in the group base station area have the same frequency point, and fully utilize limited frequency resources to expand the wireless coverage;
③ Users in the group base station area can achieve seamless handover. The wireless terminal crosses the base station in a high-speed mobile call with clear and smooth voice, without dropping calls, completely solving the handover problem of the PDT digital trunking wireless intercom system;
④ The group base station and the standard base station can be networked. The wireless terminal can roam between the group base station and the standard base station, and can share the core network, unified network management, and unified scheduling;
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