DMO terminal selection method in off-network direct mode of cluster system

Abstract

The present invention provides a cluster system off-network DMO terminal selection method. The method comprises: a first DMO terminal located out of a base station covering range is configured to send the group discovery request information carrying identification itself and the group number to a second DMO terminal broadcast in the covering range when entering into the DMO mode and being about to initiate the group calling business of the group, is configured to receive returned group discovery response information carrying the identification itself, the group number, R, C and G when at least one second DMO terminal determines the group of the group number identification consisting of the second DMO terminal, and is configured to determine one second DMO terminal in the sending group response information as a target DMO terminal according to the R, C and G and send a group calling building request or a word right application request. The cluster system off-network DMO terminal selection method is able to ensure that the terminal entering the DMO mode is able to timely obtain the current group calling state to ensure the terminal to preferentially access the on-going internet cluster group calling and obtain the current group business state so as to select the initiation the group calling building or word right application process.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for selecting a DMO terminal in an off-network direct mode of a trunking system. Background technique [0002] In the trunking communication system, when the network coverage is poor, the terminal mobility, or the base station suddenly fails, the trunking terminal may be located outside the network coverage, so that it cannot establish a connection with the network. Direct Mode Operation (DMO for short) technology can provide an optional special communication service to cluster terminals when there is no cluster network or there is a network but the network coverage is poor. It is an important component of the cluster communication system. characteristic. [0003] In the off-network direct mode, trunking terminals can directly communicate with each other to provide broadband multimedia trunking services in the direct mode. There are generally two ways to...

AI Technical Summary

Problems solved by technology

The above patents are all applicable to overlapping coverage scenarios, but do not involve the target DMO terminal selection method in overlapping coverage scenarios

In the Public Safety ProSe mechanism of the public network, although the identification required for UE-to-Relay relay UE selection in the overlapping coverage scenario is clearly defined, the current service status is not considered

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