Browse Prior Art Database

DETERMINATION OF DUPLICATE ID'S IN A COMMUNICATION SYSTEM

IP.com Disclosure Number: IPCOM000007677D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-15
Document File: 2 page(s) / 92K

Publishing Venue

Motorola

Related People

Herbert Wolf: AUTHOR [+2]

Abstract

For each "request for registration" sent to all sites, one ofthree outcomes can occur as follows: 1. If there are no responses within a specified time, then most likely no radios with that specified ID are monitoring the system. 2. If there is only one response within a specified time, then there is only one radio with the speci- fied ID. 3. Ifthere is more than one response within a speci- fied time, then there is more than one radio with the specified ID. Especially if the repeat responses are from geographical areas which are too far apart for a radio to roam in the specified period of time.

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Technical Developments

DETERMINATION OF DUPLICATE ID'S IN A COMMUNICATION SYSTEM

by Herbert Wolf and Mark Mayernick

For each "request for registration" sent to all sites, one ofthree outcomes can occur as follows:
1. If there are no responses within a specified time, then most likely no radios with that specified ID are monitoring the system.
2. If there is only one response within a specified time, then there is only one radio with the speci- fied ID.
3. Ifthere is more than one response within a speci- fied time, then there is more than one radio with the specified ID. Especially if the repeat responses are from geographical areas which are too far apart for a radio to roam in the specified period of time.

  This information is validated by repeating the process a number of times, especially if the outcomes differ between trials. This process of repeatedly requesting for registration is important for remov- ing the uncertainties involved in the trials. After sev- eral trials for a particular ID, the results should be compared to determine if one particular outcome has a significantly higher 1percentage than other out- comes. If not, then more'trials should be done until the results are more certain.

The process is illustrated in the flow diagram on next page:

1.0 INTRODUCTION

  Potentially thousands of dollars of air time may be lost by customers and vendors due to illegal users. These illegal users duplicate the radio ID of a valid subscriber and then use it as their own. This method of illegal use can also cause missed audio which is routed to the location ofthe illegal subscriber instead ofthe real subscriber.

  In a communication system with thousands of subscribers, it can be difficult to detect these illegal subscribers. However, the invention disclosed herein offers a way to...