Browse Prior Art Database

TRUNKED SYSTEM DIAGNOSTICS VIA NON-DEDICATED RADIO UNITS

IP.com Disclosure Number: IPCOM000006203D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2001-Dec-13
Document File: 2 page(s) / 97K

Publishing Venue

Motorola

Related People

Paul Cizek: AUTHOR [+2]

Abstract

It is very helpful to be able to detect a failure of any channels in a trunking system and to narrow down a possible cause of the failure at the earliest time so that service can be provided to improve the effective- ness of a communication system.

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MOTOROLA INC. Technical Developments Volume 13 July 1991

TRUNKED SYSTEM DIAGNOSTICS VIA NON-DEDICATED RADIO UNITS

by Paul Cizek and Jim Trandai

It is very helpful to be able to detect a failure of

any channels in a trunking system and to narrow down a possible cause of the failure at the earliest time so that service can be provided to improve the effective- ness of a communication system.

A solution to this improvement is:
1. To utilize all subscriber radio units to detect and to report a failure of any channel in a sys- tem and to indicate the possible location of the failure.
2. To add a microprocessor database to a diagnos- tic channel to receive and to analyze all failure reports of a control channel.

Following are the four possible failure scenarios and their method of detecting and reporting:

Scenario 1: Failure of Transmitter/Transmit path of a control channel

At first, a radio unit sends an ISW (Inbound Sig-

naling Word) in on its control channel to request for a voice channel. It may have "out of range" tone because it may be out of range of its trunking system or the transmitter of the control channel may not give out enough power to cover its designated Radio Fre- quency coverage. Radio then moves to the pro- grammed voice/diagnostic channel and it sends a mes- sage "No OSW, radio ID number". That means no Outbound Signaling Word is received from the comrol channel. If this message is actually received by the voice/diagnostic channel, then something must be wrong with the transmitter of the control channel. This message is recorded to the microprocessor database and it is counted for consistency before mak- ing a decision of a failure of the transmitter control channel. Any duplicate message with identical radio ID number is counted as one record. After a defined

number of times, a decision is made by the micropro- cessor database and a request is sent to the central controller to switch the current control channel. Once the control channel is switched, the microprocessor database clears all data history of the control channel.

Scenario 2: Failure of Receiver/Receiving path of a control channel

  If a radio unit does not receive an OSW from the control channel, it moves to the progr...