A Group Call Processing Control Method for Railway Dedicated Mobile Terminals

Abstract

The invention discloses a group call processing control method for railway-specific mobile terminals, comprising the following steps: when a user initiates a point-to-point call / group call / broadcast or answers a point-to-point call, the mobile terminal receives a channel assignment message from the Um port and joins the process , and when the user joins a group call, in the process of joining the group call service channel in the radio resource management layer, set the group call joining permission state to FALSE; when the user hangs up a group call / broadcast, ends a point-to-point call Or exit a group call / broadcast, exit from the traffic channel TCH, enter the idle state and stay in the serving cell, start to monitor BCCH, CCCH and NCH channels, when the handheld terminal monitors a complete NCH notification period on the NCH, Set the group call join allow state to TRUE. The invention can solve the problem that the handset station in conversation joins the group call channel that has been released, and can be compatible with the problem that the network notifies the group call on the FACCH with wrong parameters in some cases.

Description

technical field [0001] The invention relates to the technical field of railway communication, in particular to a group call processing control method for railway-specific mobile terminals. Background technique [0002] GSM-R is a railway-specific mobile communication system widely used in countries all over the world. An important feature of GSM-R is that it can provide users with trunking communication services such as group call (VGCS) and broadcast (VBS). When a user initiates a new group call / broadcast call, the GSM-R network will periodically send a group call notification message on the NCH, and at the same time move to the group call service support group call service on the traffic channel TCH within the group call / network area The terminal sends a group call notification message through the FACCH channel. The mobile terminal can obtain the call type, group call / broadcast ID, group call / broadcast area ID and corresponding channel description by parsing the received...

AI Technical Summary

Problems solved by technology

Therefore, when the user chooses to join the group call / broadcast after a period of time after receiving a group call during the call, the group call / broadcast has ended, causing the mobile terminal to mistakenly join the released group call channel, It is necessary to wait for the wireless link to time out before exiting the group call. The whole process takes up to 20s, which seriously affects the user experience

[0004] Another scenario is that when some network configurations are abnormal, the group call notification message sent on the FACCH is inconsistent with the parameters of the NCH group call notification message (for example: the TSC transmission in the group call channel description on the network FACCH and NCH is inconsistent, and the FACCH The TSC sent on the network is wrong, causing the user to fail to decode the voice information after joining the group call according to the FACCH notification). abnormal communication

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