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Wireless network system

一种无线网络系统、无线信号的技术，应用在无线网络系统领域，能够解决信号品质下降等问题，达到减少干涉、防止利用带宽的降低的效果

Inactive Publication Date: 2007-07-25
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the radio wave output from the access point is increased until the radio wave reaches both ends of the vehicle, the radio waves from the two access points installed one behind the other will interfere, resulting in a decrease in the quality of the signal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

A5

CH52

A10

CH149

A15

CH52

Here, the channel used is a frequency based on the wireless LAN standard stipulated by IEEE802.11a, and is a frequency available in the United States. FIG. 5 shows a table showing frequencies and center frequencies of wireless LAN standards stipulated by IEEE802.11a.

When multiple access points are used, the channels used are close to each other, which often causes interference and reduces the utilization of bandwidth. Whether interference is caused depends on the conditions of both the closeness of the channels and the distance between the access points, not just one of them. Even if the same channel is used, if the distance between the access points is large enough, or the effective ranges described later do not overlap, there will be no interference. Conversely, if the distance between access points is extremely short, it is difficult to prevent the interference of radio waves from multiple access points even if ...

no. 2 Embodiment approach

Fig. 4 is a configuration diagram of a second embodiment of the present invention.

[0030]

In the first embodiment shown in FIG. 2 , all access points are installed on the ceiling 8 . On the other hand, in the second embodiment shown in FIG. 4 , the access points arranged along one passage such as the passage P2 are provided on the floor 10 such as the rear side thereof. The access points arranged along another channel P1 are set on the ceiling 8 . If this relationship is described using FIG. 3, then the access points A4, A6, A8 arranged along the channel P1 are set on the ceiling 8, and the access points A5, A7, A9 arranged along the channel P2 are set on the ceiling 8. Floor 10 in.

[0031]

After installing the access points as shown in FIG. 4 , compared with when all the access points are installed on the ceiling 8 or all on the floor 10 , when the access points are arranged as shown in the second embodiment, the access points can be lengthened. The distance between ...

no. 3 Embodiment approach

Fig. 6 is a configuration diagram of a third embodiment of the present invention.

The access point shown in the first embodiment uses a non-directional access point for transmitting radio waves. On the other hand, in the third embodiment, directional access points are used. For example: for access point A4, use an access point with lateral directivity across the channel P1 and channel P2. The same applies to other access points. The range of communication partner seats received by each of the access points A1 to A15 is indicated by a dotted line. This range is horizontally longer than the range shown in FIG. 1 . In this way, even if the intensity of the transmitted radio waves is increased, there is an effect of reducing the interference of radio waves in the longitudinal direction (the direction in which the channel extends).

As a modified example of FIG. 6 , the directivity of the radio waves output by the access point may be directed toward the channel. In this way, i...

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Abstract

A wireless network system is provided, wherein a plurality of access points are arranged along each aisle in a vehicle having two or more aisles. A position of the access point in a first aisle and a position of an access point in a second aisle are arranged in zigzags. Thus, a distance between the access points is increased, and radio waves from the access points are prevented from being interfered.

Description

technical field [0001] The present invention relates to a wireless network system composed of at least a base station that performs transmission in wireless communication, that is, an access point, and at least a terminal that performs reception in a vehicle with multiple paths. Background technique [0002] Conventionally, when configuring a system for connecting a plurality of terminals to a network indoors or in a vehicle, a method of arranging conductor lines corresponding to the number of terminals is generally employed. [0003] Although this method has the advantage of high communication reliability, it has the disadvantage of requiring a lot of time and money for laying the wiring and requiring a lot of manpower for maintenance work after laying the wiring. [0004] On the other hand, in recent years, a network that wirelessly connects wiring with terminals has been proposed and gradually adopted. Compared with the conventional wired network, the wireless ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/36H04B7/26H04W84/12
CPCH04B7/18506H04W16/20H04W84/005H04W84/12
Inventor 森圭司东田真明坂西保昭江崎俊裕
Owner PANASONIC CORP
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