Narrow band communication vehicle-mounted apparatus

• US 20020102943A1
• Filed: 08/17/2001
• Published: 08/01/2002
• Est. Priority Date: 01/26/2001
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Takikita, Mamoru
• Granted Patent: US 7,336,932 B2
• Time in Patent Office: Days
• US Class Current: 455/67.16
• CPC Class Codes: H04B 17/318 Received signal strength

Abstract

The present invention provides a narrow band communication vehicle-mounted apparatus capable of performing communication in which there are normally no discrepancies with on-road systems when the apparatus starts up. The narrow band communication vehicle-mounted apparatus comprising: a radiocommunication portion 2 for sending and receiving with an on-road device via an antenna 1, a field intensity measuring portion 3 for detecting a radio field intensity, a control microcomputer 4 for controlling various equipment and a nonvolatile memory 5, wherein the control microcomputer 4 stores in the nonvolatile memory 5 randomly generated communication registration identification data when communication is opened or when the apparatus starts up, and communication is performed using communication registration identification data stored in the nonvolatile memory 5 in a case where the radio field intensity is in a communication range when the apparatus starts up.

Claims

1. A narrow band communication vehicle-mounted apparatus comprising:

a radiocommunication 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, wherein

said 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.

2. A narrow band communication vehicle-mounted apparatus comprising:

a radiocommunication portion for sending and receiving with an on-road device via an antenna, a frequency control portion for setting send and receive frequencies, a control microcomputer for controlling various equipment and a nonvolatile memory, wherein

said control microcomputer saves in said nonvolatile memory a radio frequency at which communication was performed, and communication is performed selecting said radio frequency saved in said nonvolatile memory as a first candidate when said apparatus starts up.