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Radio communication system and radio communication device

A technology of a wireless communication device and a wireless communication system, applied in wireless communication, wireless communication service, transmission system, etc., can solve problems such as reduced productivity of vehicle-mounted devices, troublesome adjustment of transmission power, etc., and achieve good productivity results

Inactive Publication Date: 2006-11-22
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, since the adjustment of the transmission power is a very troublesome work, it becomes the main cause of the decrease in the productivity of the vehicle-mounted device.

Method used

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  • Radio communication system and radio communication device
  • Radio communication system and radio communication device
  • Radio communication system and radio communication device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Embodiments of the present invention will be described in detail below. In the following description, the smart keyless entry system 100 will be described as an example of the wireless communication system of the present invention.

[0026] figure 1 A schematic configuration of the smart keyless entry system 100 described in this embodiment is shown. The smart keyless entry system 100 includes: a first wireless communication device (hereinafter referred to as an on-vehicle device 1) mounted on an automobile as an example of a vehicle of the present invention, and a key ( key) of the second wireless communication device (hereinafter referred to as the portable device 2). The vehicle-mounted device 1 is connected to a device (hereinafter referred to as a control unit 50 ) that performs control related to an ignition switch of a vehicle and control related to locking or unlocking a vehicle door.

[0027] In the smart keyless entry system 100 of this embodiment, the cont...

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PUM

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Abstract

A first radio communication device (1)transmits a first radio signal; a second radio communication device (2) receives the first radio signal; the second radio communication device measures the signal strength of the first radio signal; the second radio communication device (2) transmits the second radio signal containing the signal strength measurement measured by a signal strength measuring section; the first radio communication device (1) receives the second radio signal; and the first radio communication device stores a threshold value set for an individual vehicle in which the first radio communication device is mounted and compares the signal strength measurement contained in the received second radio signal with the threshold value, thereby determining the distance between the first and second radio communication devices.

Description

technical field [0001] The present invention relates to a wireless communication system and a wireless communication device of a keyless entry system that can realize good productivity. Background technique [0002] There is known a keyless entry system in which a car user (carrier) locks or unlocks a car door by remote operation of a portable device carried by the car user (carrier). In addition, there is known a smart entry system that locks and unlocks a door without operating a portable device. [0003] Here, Patent Document 1 describes that, in a keyless entry system including a vehicle-mounted wireless device (hereinafter referred to as a vehicle-mounted device) and a portable wireless device (hereinafter referred to as a portable device), the vehicle-mounted The code request signal is sent at intervals, the portable device receives the above code request signal and returns a return code, and the vehicle-mounted device outputs a signal for unlocking the car door after...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26E05B49/00H04B17/00H04W4/04H04W28/00H04W52/24H04W84/10
CPCB60R25/24B60R25/33E05B49/00H04B1/00
Inventor 山本洋也
Owner SANYO ELECTRIC CO LTD