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Narrow band communication vehicle-mounted apparatus

  • US 7,336,932 B2
  • Filed: 08/17/2001
  • Issued: 02/26/2008
  • Est. Priority Date: 01/26/2001
  • Status: Expired due to Fees
First Claim
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1. A narrow band communication vehicle-mounted apparatus comprising:

  • a radio-communication portion for sending and receiving with an on-road device via an antenna, a field intensity measuring portion for detecting a radio field intensity, a control microcomputer for controlling various equipment and a nonvolatile memory, whereinsaid control microcomputer stores in said nonvolatile memory randomly generated communication registration identification data when communication is opened or when said apparatus starts up, and communication is performed using communication registration identification data stored in said nonvolatile memory in a case where said radio field intensity is in a communication range when said apparatus starts up,wherein said randomly generated communication registration identification data is generated based on the field intensity measured by the field intensity measuring portion, andwherein said narrow band communication vehicle-mounted apparatus is mounted to a vehicle.

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