Short-distance wireless continuous communication method and system

A short-distance wireless and short-distance communication technology, applied in the field of DSRC system, can solve the problems of communication interruption and normal communication.

Inactive Publication Date: 2002-05-22
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the contrary, if the roadside antenna is installed at a long interval to avoid interference, it will not be able to communicate normally at the part where the interval is formed, and the communication will be interrupted

Method used

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  • Short-distance wireless continuous communication method and system
  • Short-distance wireless continuous communication method and system
  • Short-distance wireless continuous communication method and system

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Embodiment Construction

[0036] A first embodiment of the short-distance wireless communication system of the present invention will be described with reference to FIG. 1 .

[0037] Figure 1A is a schematic diagram showing overlapping communication ranges of roadside antennas of the short-distance wireless communication system according to the present invention, Figure 1B is a schematic diagram showing a communication frame used in DSRC of the present invention. Such as Figure 1A As shown, the roadside antennas are arranged continuously along the traveling direction of the vehicle, so that the communication range of each roadside antenna overlaps with the communication range of adjacent roadside antennas. All of these roadside antennas work by time-sharing. Each roadside antenna transmits communication frames alternately with adjacent antennas.

[0038] As described above, in the case of the present invention, roadside antennas are arranged so that their communication ranges overlap with each o...

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Abstract

To obtain a communication method which makes it possible to perform continuously communication through roadside antennas alternately arranged for a time sharing operation. Roadside antennas are arranged so that communication ranges are suitably overlapped for making the time sharing operation possible, and an on-vehicle device searches a communication frame from an adjacent next antenna during the communication with one of the roadside antennas at the overlapping point, and in the case where an FCMS can continuously be received, a switching from the communicating antenna to the adjacent antenna is instantaneously performed to make it possible to continue the communications between the roadside devices and the on-vehicle device.

Description

technical field [0001] The present invention relates to a DSRC system as a short-distance wireless continuous communication system, which is considered to be an important technology supporting an intelligent transport system (ITS). Background technique [0002] A short-range wireless communication (hereinafter referred to as DSRC (Dedicated Short-Range Communication)) system will be described below. [0003] 8A and 8B show an example of a communication frame used in DSRC. In the case of a full-duplex communication system, there are two cycles: 3.91 ms and 2.34 ms as frame cycles. One of two types of frames is used according to the size of the communication range. The transmission and reception slot allocation information in each frame is stored in the FCMS (Frame Control Message Slot) as the head slot of the frame, and the roadside equipment and vehicle equipment use the MDS (Message Data Slot) on the basis of this information. time slot) for data transmission and recepti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G07B15/00G08G1/09G08G1/0967H04B7/26H04W4/04H04W28/06H04W36/08H04W36/18H04W36/30H04W36/36H04W72/04
CPCG08G1/096758G08G1/096716G08G1/096783G06K13/08G07B15/00
Inventor 笠置贤
Owner NEC CORP
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