Digital group system PTT point-to-point calling method based on GSM technique

Abstract

This invention provides a PTT point to point communication method of a digital cluster system based on the GSM technology including: a PTT calling mobile station sends a communication requiring message, a base station controller distributes service channels for the PTT calling mobile station based on the message and sends it to the mobile service control center, which informs the controller to send the inform message to the mobile station, the PTT called station selects a service channel based on the message to communicate with the calling PTT mobile station, in the period of communication of point to point between the calling and the called stations, they occupy the up link of the radio service channels and share the down link to realize semi-duplex communication of the PTT of point to point to increase the usability of the channels.

Description

technical field [0001] The invention relates to network communication technology, in particular to a method for PTT point-to-point calling of a digital trunking system based on the GSM technology system. Background technique [0002] In the existing cluster network technology, cluster private networks are mostly used. Due to the different technologies and standards of each private network, these private networks are independently constructed by each group, which has formed a situation of independent construction, resulting in low frequency utilization efficiency and network construction. Disadvantages such as high cost and network maintenance costs. With the development of trunking communication technology from analog to digital, the construction of trunking network presents a development direction from independent private network construction to cluster common network construction. Due to the advanced technical system of the GSM (Global System for Mobile Communications) sy...

AI Technical Summary

Problems solved by technology

For point-to-point calls in the same cell, both the calling party and the called party will occupy a wireless interface channel. Therefore, under the condition that the number of channels in the cell is very limited, the capacity of the system is severely limited; The call process includes the call initiation of the calling mobile station, the response of the called mobile station, the connection and confirmation of the network side and the mobile called party, so it takes a long time to establish a call; therefore, the initial end-to-end voice transmission channel takes a long time to establish. Not suitable for specific cluster business

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