Data communication device, data communication system, and recording medium

A technology of data communication and equipment, which is applied in the field of data communication equipment, data communication systems and information collection, can solve problems such as difficult to determine the driving time, achieve the effect of reducing communication costs, reducing the amount of communication data, and avoiding congestion

Inactive Publication Date: 2010-06-23
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Difficulty determining drive periods if there is only location data associated with some of the links

Method used

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  • Data communication device, data communication system, and recording medium
  • Data communication device, data communication system, and recording medium
  • Data communication device, data communication system, and recording medium

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0032] Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein like numerals indicate like elements. The embodiments are described below in order to explain the present invention by referring to the figures.

[0033] In a typical data processing operation of calculating a travel period based on position data accumulated for a given time slot as described above, it is necessary to prepare a memory with a capacity large enough to store all position data acquired during a given time slot. A terminal device mounted on a vehicle has such a memory when calculating a travel period on the vehicle. However, when a portable device such as a portable telephone device or a PDA (Personal Digital Assistant) is used as a terminal device, stricter restrictions are set on the capacity of a memory for accumulating data than in the case of using an in-vehicle device fixed to a vehicle .

[0034] In a service system using ...

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PUM

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Abstract

The data communication device and method include storing road map information indicating locations of nodes and links, a time when a vehicle enters one link and an identifier of the link, and a vehicle location and the link identifier in a memory, periodically acquiring vehicle position data, identifying the link based on the road map information, and comparing the identified link with the link the vehicle has passed through a node. The device rewrites the position data and acquired time stored in the memory when receiving a result that the vehicle has not passed, determines an exit time based on the acquired time and the time of last acquired position data when receiving a result that the vehicle has passed, calculates a travel period of the vehicle, writes the exit time as an entry time, rewrites the link identification data, and transmits the travel period to a given communication destination. The invention can reduce the amount of communication data so as to reduce communication cost and to avoid congestion.

Description

technical field [0001] The embodiment(s) discussed herein relate to the following devices and methods: a data communication device provided in a vehicle or installed on the vehicle to notify an external device of the actual driving condition(s) in a road network; to notify an external device Driving condition(s) and a data communication device receiving information on time required to reach a destination from an external device; a data communication system; an information collection method implemented in a traffic information providing system. Background technique [0002] Services (such as telematics) have emerged that provide up-to-date traffic information to drivers and passengers on board vehicles. A user of this service can obtain information from a service center by using a terminal device such as a portable telephone device, a small computer, or a car navigation device and connecting a vehicle to the Internet. [0003] In this type of service, a car driven by a user ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/00G08G1/123
CPCG08G1/096822G01C21/32
Inventor 奥山镜子
Owner FUJITSU LTD
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