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Telephone Interrupt/preempt Radio Transmission in Telephone-radio Interconnect System Disclosure Number: IPCOM000190603D
Original Publication Date: 2009-Dec-08
Included in the Prior Art Database: 2009-Dec-08
Document File: 4 page(s) / 262K

Publishing Venue


Related People

Liang, Jetty: INVENTOR [+2]


The concept of this invention is to enrich the transition of the telephone patch to provide ability to transform the signaling from particular telephone to backward channel information and send to radio based on authentication of the telephone user. With this invention, the authenticated telephone user is able to indicate the transmitting radio user to stop transmitting and listen to the telephone user. It's vital in the cases that telephone user needs to broadcast urgent/emergent information to the radio users. The process for the telephone user interrupting an on-going radio voice transmission is: 1. Telephone user request to interrupt the on going radio voice transmission by pressing particular button from telephone. 2. Upon detect the particular button pressing, telephone patch requests telephone user to input pin code. 3. Telephone patch validate the input pin code and if it's valid code, it generates backward channel data and send to radio network to indicate radio to stop transmission.. 4. The radio receives the backward data from telephone user and stop transmission. 5. Once the transmitting radio stops transmission, telephone patch informs telephone user that the channel is cleared. The telephone user can transmit and the radios in the network are able to listen to the telephone user. An example to apply this invention is give below for the ETSI - DMR protocol based radio network. DMR defines Reverse Burst for backward channel, which could be utilized in telephone-radio interconnect system to transmit stop-transmission request from telephone user to transmitting radio user. (There is attachment to describe the invention in detail at below).

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Telephone Interrupt/Preempt Radio Transmission in Telephone-radio Interconnect System


By Xiuru Liang, Ruiqi Wu

Motorola, Inc.

Government and Public Safety



In existing telephone-radio interconnect system, telephone user is unable to interrupt/preempt radio user’s transmission during interconnection call even if telephone user has urgent or emergent information to broadcast. This documentation sets forth a method for telephone user to interrupt/preempt radio user’s transmission during an interconnection call in telephone-radio interconnect system.


A typical telephone-radio interconnection system is shown in Figure 1, a repeater is connected to telephone patch, which acts as telephone gateway and connected to PSTN/PABX. Several radio subscribers can be served by the repeater to communicate with each other or with a telephone which resides in PSTN/PABX network. A telephone-radio interconnection call can be initiated by the telephone user or by the radio user, taking the call initiated from telephone side for example, telephone user dials the target radio’s ID and then telephone patch will ring out to the radio, the call will be established once the target radio answers with access code replied. As telephone line works in full-duplex mode while the radio works in half-duplex mode, to maintain the call, usually impolite mode is used by the radio to talk back to telephone when it’s receiving voice from telephone, the signal path from telephone to radio will be turned off by telephone patch once there is carrier from radio been detected by the repeater, and after that the signal path from radio to telephone will be setup.

Usually a priority scheme is used in radio system to provide availability for higher priority users under urgent/emergent scenario, higher priority permission provisioned radio user can interrupt/preempt other lower priority radios’ transmission.

The telephone user partied in telephone-radio interconnection call should also be able to act as higher priority user, however, as the radio works in half-duplex mode and can not receive during transmit or vice versa, only the radio user can interrupt/preempt telephone user’s speaking, whereas the telephone user can not interrupt/preempt radio user’s speaking. None of existing telephone-radio interconnect system provides the functionality for telephone to interrupt/preempt radio transmission.


The come forth of backward channel mechanism in radio protocols, for example, the ETSI- Digital Mobile Radio (DMR) Systems protocol’s RC (Reverse Channel) burst, make it possible that a receiving radio subscriber to send backward information to the transmitting radio subscriber during receive.

This disclosure intends to provide the capability to higher priority provisioned telephone users to interrupt/preempt radio user’s tra...