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RADIO SECURITY FEATURE

IP.com Disclosure Number: IPCOM000005715D
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2001-Oct-30
Document File: 2 page(s) / 66K

Publishing Venue

Motorola

Related People

Marie Shanley: AUTHOR

Abstract

In a conventional two-way radio some means is needed to prevent an unauthorized person from using a stolen radio. A password system cannot be implemented if the radio does not have a keypad. One alternative is for the radio to request authorization from the base station automatically on power-up, and not to allow fur- ther operation until authorization is received.

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MOTOROLA Technical Developments Volume 6 October 1966

RADIO SECURITY FEATURE

by Marie Shanley

   In a conventional two-way radio some means is needed to prevent an unauthorized person from using a stolen radio. A password system cannot be implemented if the radio does not have a keypad. One alternative is for the radio to request authorization from the base station automatically on power-up, and not to allow fur- ther operation until authorization is received.

   When the radio is first powered up, it will not respond to any user inputs. It will wait until the channel is clear, then transmit a request message (tone or binary sequence indentifying the radio) to the base station and wait for a reply. The base station will check the radio ID against a list of stolen or unauthorized radios. If the radio's ID is not on the list, the base station will transmit a reply (possibly a variation of the ID) back to the radio. After the radio decodes the reply, it will unlock itself and all user features will be accessible. No further authorization will be required as long as the radio remains turned on, even if it is changed to a different channel.

If the radio does not receive a response from the base station within a few seconds, it will key up and send the request again. This will continue at regular intervals until a response is received orthe radio is turned off.

Figure 1 illustrates the communications between the radio and base station. Figure 2 is a flowchart of the radi...