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Public network PoC soft intercom and PDT digital trunk interworking scheme

Views: 99     Author: Site Editor     Publish Time: 2019-10-23      Origin: Site


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Public network Push-to-Talk Over Cellular soft intercom is more and more popular because of its convenient use and no distance limitation. It is widely used in various industries.

However, the public network intercom cannot completely replace the traditional private network intercom system, especially the 350M PDT digital trunking system for public security. In the extreme case of sudden, public network communication facilities are often severely damaged. Therefore, in the case of emergency rescue or emergency missions, the private network cluster system of the relevant command department still plays an irreplaceable role. This poses a challenge for the interconnection of two different cluster intercom systems.

1 Traditional intercom program and comparison

1.1 Public Network PoC Soft Intercom

The public network PoC soft intercom is a mobile communication system for command and dispatch established based on the operator's mobile communication network. PoC soft intercom can realize cluster intercom function with very little traffic, and has more powerful functions than traditional walkie-talkie, such as instant messaging, picture transmission, real-time video backhaul and so on. The implementation principle of the public network PoC soft intercom is relatively simple, adopting the C/S (client/server) mode. Simply deploy a PoC server on the network side and develop a soft intercom app to turn your smartphone into a powerful walkie-talkie. Its main position is to provide work management and command and dispatch services for enterprises, institutions and groups, mainly for group users, such as public security, fire protection, hospitals, urban management, government agencies, transportation, airport aviation, large-scale gatherings, military Application, etc. Due to its wide coverage and low cost, it can be quickly deployed in batches to meet the needs of these groups to improve emergency response speed and work efficiency.

1.2 Private network cluster intercom

The public security industry private network intercom communication system mainly refers to 350M regular mode, analog cluster mode (MPT1343, CPX) and digital trunk walkie-talkie (PDT, TETRA). This type of self-built relay station system has the advantages of safety and stability, high connection rate, and is not susceptible to network fluctuations. However, the system is limited by the number of base stations, building blocks, etc., and the coverage is limited. Suburban counties and remote areas cannot talk.

Public security systems often require the transmission of urgent orders, the notification of important cases, the analysis of important cases, and the deployment of major events. However, these activities have been affected by the lack of a private network system.

Specifically, the shortcomings of the private network system can be summarized as follows.

(1) 350M conventional system: frequency can not be reused, limited to simple intercom of small-scale, small group, without any security confidentiality and system scalability.

(2) Analog cluster system: limited number of coverage base stations, limited number of channels, easy to be eavesdropped, frequent interference noise, poor security; low spectrum utilization, low level of cluster application, outdated technology, and poor service expansion capability.

(3) Digital trunking system: In the initial stage of popularization, it has not been applied on a large scale. It also has the limitations of limited number of base stations, the inability to talk over long distances, and the limited number of channels, and the terminal and base station construction costs and upgrade and maintenance costs are very high.


1.3 Comparison of two intercom solutions

The advantages and disadvantages of the two intercom solutions are shown in Table 1.

project Public network POC Private network cluster
Range of use wide wide
Fixed investment low high
Terminal cost low high
reliability low high
Instructions complex simple
Multimedia function Supported Unsupported
Tariff yes no

The above two intercom solutions have their own characteristics and application scenarios, which can complement and backup each other. Therefore, interconnection has become an important development direction of the cluster intercom field.

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