PTT authorization release method and device of PDT system

Abstract

The invention discloses a PTT authorization release method for a PDT system, and the method comprises the steps that a cluster base station starts a timer after transmitting PTT authorization permission to a mobile station, if the cluster base station receives the voice frame sent by the mobile station, the timer is restarted, when the cluster base station receives PTT release signaling from the mobile station, the cluster base station stops the timer, and when the timer is overtime, the cluster base station actively releases the PTT authorization. By applying the technical scheme disclosed bythe invention, the fault tolerance of the system can be improved, the user experience is improved, and the waste of air interface resources is avoided.

Description

technical field [0001] The present application relates to the technical field of trunking communication, and in particular to a PTT authorization release method and device for a PDT system. Background technique [0002] For the trunking voice service of the Police Digital Trunking (PDT) system, there are usually multiple mobile stations participating in a call. In order to avoid voice collisions, the Push To Talk (PTT: Push To Talk) authorization process is stipulated. Only PTT authorization The mobile station can only send voice, and the mobile station without PTT authorization can only monitor the voice. [0003] Before the mobile station speaks, it needs to apply for PTT authorization from the system. After obtaining the authorization, the mobile station can start speaking. After the speech is over, it needs to send PTT release to the system. Please refer to "PDT Digital Trunked Communication System Technical Specification - Air Interface Call Control Layer" for the spec...

AI Technical Summary

Problems solved by technology

[0005] 1. An abnormality (such as battery exhaustion) occurs during the mobile station's speech, and no PTT release signaling is sent;

[0006] 2. The mobile station sent the PTT release signaling, but the base station could not correctly receive the signaling due to weak transmission signals or signal interference.

[0011] After the mobile station MS1 ​​finished speaking, due to the possible situation as mentioned above, the trunking base station did not receive the PTT release signaling of the mobile station MS1

In this abnormal situation, the right to speak has been invalidly occupied, and other mobile stations (MS2) can neither listen to the voice nor apply for PTT authorization.

This abnormal situation not only affects the user experience, but also wastes air interface resources.

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