Wireless communication system

A technology of wireless communication system and communication quality, which is applied in the field of wireless communication system, can solve the problem of endless transition pattern, achieve high operation rate and avoid radio wave interference

Active Publication Date: 2015-09-30
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] That is, there is a problem that the change process of the hopping pattern for avoiding radio wave interference may be endless due to fear that the influence of the change of the hopping pattern of one wireless station may affect other wireless stations.

Method used

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no. 1 Embodiment approach

[0037] The first embodiment will be described.

[0038] first, figure 2 An example configuration of the wireless communication system according to the first embodiment is shown. about figure 2 In the wireless communication system, the main station is a ground station, and the sub-station is a mobile body such as a train. It is a wireless communication system suitable for a wireless control system that controls a mobile body by wireless. The central station 100 is connected to a plurality of ground stations 1 on the main line The network 60 and the train control device 101 are connected to the central station 100 via the branch line network 61, and each ground station 1 is arranged along the traveling path 6 of the train 5, and communicates with a plurality of trains 5 traveling on the traveling path 6 via the wireless network 62 .

[0039] In addition, in order to improve the reliability of the network, the trunk network 60 and the branch network 61 may also multiplex tra...

no. 2 Embodiment approach

[0089] In the above-mentioned first embodiment, the channels usable in the wireless communication system are grouped into four channel groups by four channels each.

[0090] However, if Figure 15 As shown, depending on the grouping method of the channel group, the radio waves of other wireless systems can also affect all the channels in one channel group of the present wireless communication system to interfere. in e.g. Figure 15 In the case of , there is a possibility that the ground station 1 may become unusable due to a decrease in communication quality every time the channel phases of CG1 and CG3 are used.

[0091] Therefore, the center station 100 which detects such a state of radio wave interference (a state in which a decrease in communication quality is detected in all channels in the same channel group) can Figure 16 As shown, the grouping of the channel group is changed to a grouping that can avoid radio wave interference.

[0092] The change of the grouping of...

no. 3 Embodiment approach

[0098] In the above-mentioned first embodiment, the channels usable in the wireless communication system are evenly grouped into four channel groups by four channels each.

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Abstract

A wireless communication system includes: a plurality of master stations; slave stations that communicate with the master stations; and a central station that instructs frequencies used in the master stations; wherein each of the master stations has a plurality of frequencies changed at constant time intervals, each of the master stations selects a frequency to use out of the frequencies not overlapping with the frequency used in another master station in the same time zone, from among the plurality of frequencies, and when communication quality of the selected frequency to use is lower than a predetermined threshold value, each of the master stations switches the frequency to the other frequency from within the plurality of frequencies included in the own station.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to a wireless communication system for communicating between a plurality of central stations and a plurality of sub-stations. Background technique [0002] As background art in this technical field, there is Japanese Patent Laid-Open No. 11-177531 (Patent Document 1). In this publication, such a wireless communication system is described: if an interfering radio wave for frequency hopping spread spectrum communication is detected in any wireless area, the wireless main station and wireless sub-station in the wireless area use the hop The pattern (hopping pattern) is changed to the first hopping pattern for communication trouble countermeasures using only the frequency of the frequency band that can avoid interfering radio waves, and is used by wireless main stations and wireless sub-stations in other wireless areas adjacent to this wireless area The hopping pattern is chan...

Claims

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Application Information

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IPC IPC(8): H04W16/10
CPCH04W72/0453H04W72/082H04W72/541H04W16/10
Inventor 大仓敬规山崎良太酒井宪一
Owner HITACHI LTD
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