JP2003348000A - Wireless network system, and management apparatus and management method for wireless network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably obtain an excellent communication state by a wireless network 60 having a plurality of communication base stations 600 to 603 for mutually making wireless communication with each other wherein a train 1 passes through between two of the plurality of communication base stations. <P>SOLUTION: A wireless network management apparatus 30 is provided with: a position acquisition section 31 for acquiring position information of the train 1; a communication path setting section 33 for deciding communication paths among the plurality of communication base stations 600 to 603, capable of avoiding a communication fault due to the train 1 depending on the position information of the train 1; and a wireless network control section 41 for controlling each of the communication base stations 600 to 603 so that the communication among the plurality of communication base stations 600 to 603 is made by the communication path set by the communication path setting section 33. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless network having a plurality of communication base stations for performing wireless communication with each other, and a mobile unit passing between at least any two of the plurality of communication base stations. The present invention relates to a management device, a management method, and a wireless network system.

[0002]

2. Description of the Related Art Conventionally, with respect to management of a wireless network having a plurality of wireless communication base stations, there is a technique described in Japanese Patent Application Laid-Open No. 2000-13393. In this technique, a wireless communication path is multiplexed, a communication state of a specific communication path is constantly monitored, and when the communication state of the specific communication path deteriorates, the communication path is switched to another communication path.

[0003]

However, in the prior art, for example, when considered in a certain time unit, a good communication situation is obtained as a whole. Even if a temporary communication failure occurs in the path, the other communication path is immediately switched, so after the communication path is switched, the specific communication path before switching may not be the optimal communication path. Regardless, this communication path may not be available. Therefore, when the communication condition of the specific communication path is improved, if the specific communication path is used again, the communication path is changed many times despite the temporary communication failure. In particular, when a temporary communication failure occurs a plurality of times, it is necessary to frequently switch communication paths. Furthermore, if a mobile object that causes a communication failure is located between two wireless communication base stations forming a specific communication path, communication must be performed once the communication failure occurs. You cannot recover. That is, in the related art, there is a problem that a good communication state cannot be supplied stably.

Accordingly, the present invention focuses on the above-mentioned problems of the prior art, and is suitable for a radio network having a plurality of radio communication base stations when a mobile object passes between certain two base stations. It is an object of the present invention to provide a wireless network management device and a management method for stably supplying a communication state, and a wireless network system.

[0005]

According to a first aspect of the present invention, there is provided a wireless network management apparatus, wherein a mobile object passes between at least any two of a plurality of communication base stations which perform wireless communication with each other. In a wireless network management apparatus that manages a wireless network to perform, in a wireless network management device, a position obstruction unit that acquires position information of the mobile unit, and a communication failure caused by the mobile unit according to the position of the mobile unit obtained by the position obtainment unit. It is possible to avoid, communication path setting means for defining a communication path between the plurality of communication base stations, and communication between the plurality of communication base stations is performed on the communication path set by the communication path setting means, Wireless network control means for controlling the plurality of communication base stations.

Here, the communication path setting means stores, for each position of the moving body, a plurality of communication paths between the plurality of communication base stations which can avoid a communication failure by the moving body. Storage means, and path extracting means for extracting a communication path corresponding to the position of the moving object acquired by the position acquiring means from among the plurality of communication paths stored in the path storing means. It may be.

[0007] The wireless network control means includes:
For each of the plurality of communication paths stored in the path storage means, the communication base of each communication base with which wireless communication should be established and / or the other party with which wireless communication should be disconnected are stored as control information. Control information storage means, when the communication path setting means sets a communication path, control information extracting means for extracting control information corresponding to the communication path, and the control information extracted by the control information extracting means Communication means for notifying the network.

[0008] A wireless network system for achieving the above object is characterized by including the above wireless network management device and the wireless network managed by the wireless network management device.

In another wireless network system for achieving the above object, the wireless network management device detects the position of the moving object, and the position acquisition means of the wireless network management device sends the moving object to the position acquiring means. Position detection means that gives the position of, or assuming the position of the moving body,
And a position estimating means for giving the position of the moving object to the position acquiring means of the wireless network management device.

Here, in the above wireless network system, the wireless network is arranged in a train station yard,
The moving object may be the train.

[0011] A wireless network management method for achieving the above object is a wireless network for managing a wireless network through which a mobile object passes between at least two of a plurality of communication base stations that perform wireless communication with each other. In the network management method, a position acquisition step of acquiring position information of the moving body, and, according to the position of the moving body acquired by the position acquiring means, a plurality of the plurality of the communication obstacles can be avoided. A communication path setting step of determining a communication path between communication base stations, and communication between the plurality of communication base stations,
A wireless network control step of controlling a plurality of the communication base stations so as to be performed on the communication path set by the communication path setting means.

An operation program of a wireless network management apparatus for achieving the above object manages a wireless network through which a mobile object passes between at least two of a plurality of communication base stations that perform wireless communication with each other. In the operation program of the wireless network management device to perform, according to a position acquisition procedure for acquiring the position information of the moving object and a position of the moving object acquired by the position acquiring means, a communication failure due to the moving object can be avoided. A communication path setting procedure for determining a communication path between the plurality of communication base stations, and a plurality of the plurality of the communication base stations, so that communication between the plurality of communication base stations is performed on the communication path set by the communication path setting means. And a wireless network control procedure for controlling the communication base station.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of a wireless network system according to the present invention will be described below with reference to the drawings.

First, a wireless network system according to a first embodiment of the present invention will be described with reference to FIGS.

In the present embodiment, as shown in FIG. 1, a wireless network 60 is constructed for each premises of each station 5 through which a train 1 as a moving object passes, so that even when the train 1 exists in the premises of the station 5, it is good. Wireless communication.
The wireless network 60 includes a plurality of wireless communication bases 600,
601, 602 and 603. Station 5
The station staff in the premises uses the wireless communication terminal to wirelessly communicate with another wireless communication terminal via the wireless network 60.

The wireless network system according to the present embodiment includes a mobile object tracking device 10 that tracks a moving train 1 to detect a position, and a wireless network management device 30 provided for each wireless network 60. , A position information distribution device 20 for transmitting train position information from the mobile object tracking device 10 to each of the wireless network management devices 30 and 30
And The wireless network management device 30
Plurality of wireless communication bases 6 constituting wireless network 60
One of 00, 601, 602, and 603 is connected to one wireless communication base 600 by a communication cable 61. Here, the wireless network management device 30 and one wireless communication base 600 are connected by the communication cable 61, but the wireless communication between the two devices 30, 600 may be performed.

The mobile object tracking device 10 has a plurality of on-line detecting units 11, 11,... Normally, when managing the position of the train 1, the track 2 is divided into a plurality of parts, each of which is a track circuit, and whether the train 1 exists on any of the track circuits,
In other words, it is checked whether the train 1 is on the track on any of the track circuits. Therefore, in the present embodiment, at least one on-rail detecting unit 11 is provided for each track circuit. In particular, here, the premises of the station 5 and the entrance and exit of the premises of the station 5 are each provided with at least one on-rail detection unit 11.
Is provided.

As shown in FIG. 2, the moving object tracking device 10 includes a plurality of on-line detecting units 11, 11,.
The on-line position management unit 12 that determines the on-line position of the train 5 based on the information from the on-line detection units 11, 11,..., And the on-line position of the train 5 determined by the on-line position management unit 12 is used as a position information distribution device. And a distribution device-side communication unit 13 for sending the data to the communication device 20.

As shown in FIG. 3, the on-line detecting section 11 detects the voltage between the two rails constituting the line 2, and determines whether or not the on-line exists based on the voltage change. In particular,
For example, a voltage difference of 3 V is provided between two rails. At this time, when the train 1 is on the train, the two rails are electrically connected to each other via the wheels of the train 1. In other words, the two rails are short-circuited. Therefore, the on-rail detection unit 11 detects a low voltage level of, for example, about 0.1 V, and
When there is no on-rail, the on-rail detecting unit 11 detects a high voltage level of approximately 3 V since the two rails are electrically released. Therefore, the on-rail detection unit 11
When a low voltage level of about 0.1 V is detected, it is determined that the train 1 is on the track circuit provided with the on-rail detection unit 11 and the track circuit number or the position number given in advance. To the on-rail position management unit 12.

The on-line position management unit 12 includes the on-line detection units 1
By tracking the track circuit numbers notified from 1, 11,..., The track position of the train 1 is tracked, and the number of the track circuit that has changed from the non-track state to the track state is used as the position information of the train 1 as the distribution device side. Distribution device control unit 20 via communication unit 13
Send to Note that, here, the on-rail detection unit 11 notifies the on-rail position management unit 12 of the track circuit number and the like, but the on-rail detection unit 11 simply notifies the on-rail position management unit 12 of the on-rail state, The on-rail position management unit 12 may determine which on-rail detection unit 11 has received the notification of the on-rail status, thereby acquiring the track circuit number in the on-rail status.

As shown in FIG. 4, the location information distribution device 20 includes a tracking device side communication unit 21 that communicates with the communication unit 13 of the mobile unit tracking device 10, and each of the network management devices 30 and 30.
Device-side communication unit 22 that communicates with a train station, a management device number table storage unit 23 that stores the number of the network management device 30 of the corresponding station in association with the position of the train, and a train position from the storage unit 23. And a control unit 25 that controls the communication units 21 and 22 and the search unit 24. The wireless network management device search unit 24 extracts the number of the wireless network management device 30 of the station corresponding to.

As shown in FIG. 5, the management device number table storage unit 23 stores position numbers (track circuit numbers in the case of trains) indicating the positions of the mobile units, and stations corresponding to the respective positions of the mobile units. A number table in which the numbers of the network management apparatuses 30 are associated with each other is stored. Specifically, for example, for the position numbers 1 to 3 of the trains, the network management device 30 provided in the specific station 5 near the position of the position numbers 1 to 3
Number is associated.

The control unit 2 is controlled via the tracking unit communication unit 21.
5 receives the position number of the train from the mobile tracking device 10, notifies the wireless network management device search unit 24 of the position number, and searches for the number of the wireless network management device 30 corresponding to the position number. Give instructions to The wireless network management device search unit 24 searches the management device number table storage unit 35 for a wireless network management device number corresponding to the position number from the control unit 35, and returns the result to the control unit 25. The control unit 25 instructs the management device-side communication unit 22 to send the position number to the wireless network management device 30 corresponding to the management device number. Receiving this, the management device side communication unit 22 transmits the position number to the instructed wireless network management device 30.
That is, the position number of the train is transmitted to the wireless network management device 30 of the station 5 near the position of the train.

As shown in FIG. 6, the radio network management device 30 includes a position acquisition unit 31 for acquiring the position of the train,
A path setting unit 33 for setting a communication path of the wireless network 60; and a wireless communication unit for controlling each communication base station configuring the wireless network 60 so that communication is performed on the wireless communication path set by the path setting unit 33. A network control unit 41. The position acquisition unit 31 includes a distribution device-side communication unit 32 that communicates with the position information distribution device 20. Further, the route setting unit 33 stores a pattern number correspondence table indicating a correspondence relationship between a number of a wireless configuration pattern and a train position number for realizing an appropriate communication route of the wireless network 60. And a wireless configuration pattern search unit 35 for searching a wireless configuration pattern number corresponding to the train position number from the correspondence table, and a management device control unit 36 for controlling the search unit 35. Also,
The wireless network control unit 41 is a control information storage unit that stores control information indicating which communication base each of the plurality of communication bases configuring the wireless network 60 should establish communication with for each wireless configuration pattern number. 42, a control information extracting unit 43 for extracting control information corresponding to the wireless configuration pattern number from the control information storage unit 42, a wireless configuration pattern number storage unit 44 for temporarily storing the wireless configuration pattern number, A wireless network side communication unit 46 for transmitting control information and the like to a communication base constituting a wireless network, and a wireless network configuration control unit 45 for controlling the control information extraction unit 43 and the wireless network side communication unit 46
And Note that the wireless network management device 30 in the present embodiment is configured by a computer or a computer, and each of the storage units 34, 42, and 44 is configured to include a memory or a storage device having various storage media. Functional parts 32, 35, 36, 43, 45, 46
Are a memory or a storage device, and a CPU that executes a program stored in the memory or the storage device.
Alternatively, it is configured to include a processing device.

The pattern number correspondence table storage unit 34 stores FIG.
As shown in (1), the number of the wireless configuration pattern for realizing an appropriate communication route of the wireless network 60 is stored for each train position number, in other words, for each track circuit number. The position number stored in the correspondence table is a position number set in a place near the station where the wireless network management device 30 is installed.

As described above, the control information storage unit 42 stores the control information indicating to which communication base each of the plurality of communication bases constituting the wireless network 60 should establish communication for each wireless configuration pattern number. Is stored. Specifically, as shown in FIG. 8, for example, when the wireless configuration pattern number is set to 1, as shown in FIG.
An operation instruction to disconnect the communication path with the communication base 603,
An operation instruction is given to the communication base 601 to establish a communication path with the communication base 603, and an operation instruction is given to the communication base 600 to cut the communication path with the communication base 602. On the other hand, an operation instruction to establish a communication path with the communication base 602 is stored.

The communication unit 3 of the distribution device of the position information acquisition unit 31
2 acquires the position number of the train from the distribution device 20, the management device control unit 36 of the route setting unit 33 notifies the search unit 35 of the position number of the train, and the wireless configuration pattern number corresponding to the position number To search. The search unit 35 extracts a wireless configuration pattern number corresponding to the position number of the train from the pattern number correspondence table storage unit 34, and passes this to the management device control unit 36. The wireless configuration pattern number searched here is the number of the wireless configuration pattern in which the wireless communication path of the wireless network 60 is hard to be interrupted even if the train exists at the position of the position number. The management device control unit 36 includes the search unit 3
5 is notified to the wireless network configuration control unit 45 of the wireless configuration pattern number. Wireless network configuration controller 4
Reference numeral 5 denotes a wireless configuration pattern number storage unit 44 for confirming whether it is necessary to change the wireless configuration pattern.
Is compared with the pattern number from the route setting unit 33, and when the numbers are different,
After the pattern number from the route setting unit 33 is stored in the wireless configuration pattern storage unit 44, the pattern number is notified to the control information extraction unit 43. The control information extraction unit 43 stores the control information corresponding to the pattern number in the control information storage unit 42
, And passes the control information to the wireless network configuration control unit 45. The wireless network configuration control unit 45 transmits this control information via the wireless network side communication unit 46,
Notify the wireless network 60.

The wireless network 60 connected to the wireless network management device 30 via the communication cable 61
The wireless communication base 600 of the wireless network management device 3
0, an antenna 63 for performing wireless communication with other wireless communication bases 601, 602, and 603, a wireless communication unit 64, and a communication partner for the wireless communication unit 64. And a control unit 66 for controlling them. The other wireless communication bases 601, 602, 6
03 is the same as the configuration of the wireless communication base 600 except that the management device-side communication unit 62 of the above configuration is not provided.

The management device-side communication unit 62 of the wireless communication base 600 connected to the wireless network management device 30 via the communication cable 61 is connected to the wireless network management device 3.
When the control information for each communication base is received from 0, the control unit 6
6 judges whether the control information is control information addressed to itself, and if it is control information addressed to itself, passes the control information to the communication control unit 65 and sends control information addressed to another communication base. If this is the case, the control information is passed to the wireless communication unit 64. When the communication control unit 65 receives the control information addressed to itself, it analyzes the control information and controls the wireless communication unit 64 to execute communication establishment or disconnection with the target communication base indicated by the control information. I do. As a result, the wireless communication control unit 64 establishes communication with the target communication base indicated by the control information or disconnects the communication.

As a method of establishing and disconnecting communication with the target communication base, a communication frequency for communication with another communication base is made different for each of the other communication bases, There is a method of establishing and disconnecting communication with a target communication base by appropriately selecting a frequency. In addition, there is a method in which a signal indicating a communication establishment target is included in a communication signal, and communication is established when the communication base of the communication establishment target receives the signal.

When receiving the control information addressed to another communication base, the wireless communication unit 64 transfers the control information to another communication base with which communication is currently established.

A wireless communication base 60 not connected to the wireless network management apparatus 30 via the communication cable 61
When the wireless communication units 641, 602, and 603 receive control information from another wireless communication base, the control unit 66 determines whether the control information is control information addressed to itself, and performs control for itself. If the information is information, the control information is passed to the communication control unit 65. If the information is control information addressed to another communication base, the control information is passed to the wireless communication unit 64. When the communication control unit 65 receives the control information addressed to itself, it analyzes the control information and controls the wireless communication unit 64 to execute communication establishment or disconnection with the target communication base indicated by the control information. I do. When receiving the control information addressed to another communication base, the wireless communication unit 64 transfers the control information to another communication base with which communication is currently established.

Here, the operation of the system of this embodiment when the train 1 enters the premises of the station 5 will be specifically described.

As shown in FIG. 10, it is assumed that the train 1 has entered the premises of the station 5 from the left side of the figure.

In this case, the moving object tracking device 1 installed in the track circuit 606 set on the left side of FIG.
The presence of the train 1 in the track circuit 606 is detected by the on-rail detection unit 11 of 0, and the detection result, that is, the position number of the train 1 is notified to the position information distribution device 20. The search unit 24 of the position information distribution device 20 searches the management device number table storage unit 23 for the number of the wireless network management device 30 provided in the station 5 near the position indicated by the position number from the mobile unit tracking device 10. . The management device-side communication unit 22 of the location information distribution device 20 includes a wireless network management device 30 corresponding to the management device number searched by the search unit 24.
To the location number of train 1.

When the wireless network management device 30 receives the position number, the search unit 35 of the wireless network management device 30 stores the pattern number correspondence table storage unit 34 shown in FIG.
, The wireless configuration pattern number “1” corresponding to the train position number (track circuit 606) is extracted and passed to the management device control unit 36. The management device control unit 36 notifies the wireless network configuration control unit 45 of the wireless configuration pattern number “1” from the search unit 35. The wireless network configuration control unit 45 compares the pattern number stored in the wireless configuration pattern number storage unit 44 with the pattern number from the management device control unit 36. Here, it is assumed that “2” is stored as a pattern number in the wireless configuration pattern number storage unit 44. In this case, it is necessary to change the wireless configuration pattern from pattern 2 to pattern 1.
When “1” is stored as the pattern number in the wireless configuration pattern number storage unit 44, there is no need to change the wireless configuration pattern, and the communication path of the wireless network 60 is maintained as it is. .

When the wireless network configuration control unit 45 determines that the pattern number “2” stored in the wireless configuration pattern number storage unit 44 is different from the pattern number “1” from the management device control unit 36, The pattern number "1" from the device control unit 36 is stored in the wireless configuration pattern storage unit 44.
After that, the control information extracting unit 43 is notified. The control information extraction unit 43 extracts the control information A (shown in FIG. 8) corresponding to the pattern number “1” from the control information storage unit 42, and extracts the control information A from the wireless network configuration control unit 4.
Pass to 5. The wireless network configuration control unit 45 notifies the control information A to the wireless network 60 via the wireless network side communication unit 46.

When the wireless communication base 600 receives the control information A among the plurality of wireless communication bases 600, 601, 602, and 603 constituting the wireless network 60, the control information is transmitted to itself as described above. Is determined, and if the control information is addressed to itself, communication control is performed in accordance with the control information.If the control information is addressed to another communication base, the control information is transmitted to another communication base. Transfer to communication base.

In this case, the wireless network management device 30
Is the control information A shown in FIG. 8, the control information No. 2, 3, and 3 are provided to the radio communication base 600 in order from the control information No. 1 of the control information A.
4 is sequentially sent. The wireless communication base 600
The information of the control information number 1 transmitted first and the information of the control information number 2 transmitted next are control information of the other wireless communication bases 602 and 601. Transfer to communication bases 601 and 602.

By the way, since the current wireless configuration pattern of the wireless network 60 is pattern 2, as shown in FIGS.
1 and a communication path with the communication base 602 are established, and a communication path between the communication base 602 and the communication base 603 is established. Therefore, at this stage, the wireless communication base 600 can directly transmit the control information to the wireless communication bases 601 and 602.

Therefore, the wireless communication bases 601 and 602 first receive the information of the control information numbers 1 and 2 from the wireless communication base 600. When the wireless communication base 602 receives the information of the control information number 1, it recognizes that the information of the control information number 1 is its own control information, and disconnects the communication path with the wireless communication base 603 according to this information. I do. When the wireless communication base 601 receives the information of the control information number 2, it recognizes that the information of the control information number 2 is its own control information, and according to this information, the communication path with the wireless communication base 603. To establish.

The radio communication base 600 has control information numbers 1 and
Subsequent to the information of No. 2, information of control information number 3 is received.
Recognizing that the information of the control information number 3 is its own control information, the information of the wireless communication base 602 is determined according to this information.
Disconnect the communication path with. Subsequently, the wireless communication base 600 receives the information of the control information number 4. Since the information of control information number 4 is control information of another communication base 603, the information is transferred to another communication base 601 having a communication path established with itself at this stage. Since the information of the control number 4 is control information of the communication base 603, the information is further transferred from the communication base 601 to the communication base 603. Wireless communication base 603
Receives the information of control information number 4, recognizes that the information of control information number 4 is its own control information,
According to this information, a communication path with the wireless communication base 602 is established.

As a result, the wireless configuration pattern 1 is configured. As shown in FIGS. 10 and 12, a communication path is established between the communication base 600 and the communication base 601, and the communication base 601 is further connected to the communication base 603. Is established, and a communication path between the communication base 603 and the communication base 602 is further established. For this reason, the train 1
6 and the communication between the communication base 600 and the communication base 602 fails,
0, 602, and the communication bases 600, 60 constituting the wireless network 60 by other communication paths.
Since communication between 1,602,603 is ensured, good communication information can be provided to the user of the wireless communication terminal.

Next, as shown in FIG.
A case where the vehicle enters the premises from the right side of FIG.

In this case, the mobile unit tracking device 1 installed in the track circuit 607 set on the right side of FIG.
The presence of the train 1 in the track circuit 607 is detected by the on-line detection unit 11 of 0, and the detection result, that is, the position number of the train 1 is notified to the position information distribution device 20. The position information distribution device 20 notifies the wireless network management device 30 provided in the station 5 near the position indicated by the position number from the mobile object tracking device 10 of the position number.

When the wireless network management apparatus 30 receives the position number, the search unit 35 of the wireless network management apparatus 30 stores the pattern number correspondence table storage unit 34 shown in FIG.
, The wireless configuration pattern number “2” corresponding to the train position number (track circuit 607) is extracted from the management device control unit 3
6 to the wireless network configuration control unit 45. Hereinafter, similarly to the above, the pattern number stored in the wireless configuration pattern number storage unit 44 and the route setting unit 3
The control information B (shown in FIG. 8) corresponding to the pattern number “2” is transmitted from the management device control unit 36 to the wireless network 60 when the numbers are different from each other.

The wireless network 60 transmits the control information B
When the communication base 600 is configured, the wireless base station forms a wireless configuration pattern 2 and, as shown in FIGS.
1 and a communication path with the communication base 602 are established,
Further, a communication path is established between the communication base 602 and the communication base 603. For this reason, the train 1
, Even if a failure occurs in the communication between the communication bases 601 and 603,
Each of the communication bases 600, 601, 6 constituting the wireless network 60 by another communication path without performing communication between the communication bases 603
Since communication between 02 and 603 is ensured, good communication information can be provided to the user of the wireless communication terminal.

As described above, the present embodiment is not for the case of an instantaneous communication failure, but for the case where the train 1 which is a mobile body exists between a certain radio communication base and another radio communication base, and between the two bases. The wireless communication path is changed when a failure occurs almost certainly in the communication of the communication, so that the communication path does not change frequently as in the related art, and when considered in a certain time unit, a good communication state is obtained. Can be obtained stably. Moreover, in the present embodiment, instead of changing the communication path after a communication failure occurs as in the related art, when a situation is assumed in which the communication failure is assumed to occur almost certainly, prior to the occurrence of the communication failure, Since the communication path is changed, it can be said that a favorable communication state is secured from this point as well.

Further, in this embodiment, the communication route between a plurality of wireless communication bases which are normally used is changed without providing a spare facility in case of communication failure as in the prior art. , The equipment cost can be reduced.

Next, a wireless network system according to a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

As shown in FIG. 13, the wireless network system of the present embodiment is provided with a moving object position estimating device 70 instead of the moving object tracking device 10 in the first embodiment.

As shown in FIG. 14, the moving object position estimating device 70 includes a moving plan table storage unit 71 storing a moving plan table indicating the position number of the moving object at each time, and a clock 73.
And a moving body position extracting unit 72 for extracting the moving body position number at the current time indicated by the clock 73 from the moving plan table storage unit 71, and a moving body position number extracted by the moving body position extracting unit 72. Communication device 75 to notify
And

As shown in FIG. 15, the movement plan table is a table showing the relationship between each time and the position number of the train which is a moving body. Indicates all position numbers where a train can exist.

The control unit 74 of the moving body position estimation device 70
Upon receiving the notification of the current time from the clock 73, the current time is notified to the mobile unit position extraction unit 72, and an instruction is issued to extract the position number of the mobile unit at this time. Moving object position extraction unit 72
Receives this instruction, extracts the position number of the mobile unit at the current time from the mobile unit plan table storage unit 71, and notifies the control unit 74 of this. When receiving the position number, the control unit 74 notifies the distribution device 20 of the position number via the distribution-side communication unit 75. Hereinafter, the operations of the distribution device 20, the wireless network management device 30, and the wireless network 60 are as follows.
This is the same as in the first embodiment.

As described above, the position of the moving object may be actually obtained by detecting the position as in the first embodiment. However, as in the present embodiment, the position of the moving object is assumed from a movement plan table or the like. May be. If there is a problem with the operation of the moving train and there is a temporary change in the travel plan,
The position of the train is assumed based on the changed travel plan table.

In the above embodiment, the position acquisition unit 31 of the wireless network management device 30 acquires the position information of the train from another device.
0 itself may detect the position of the train or assume the position of the train.

The above embodiments are all examples in which the present invention is applied to a railway system. However, the present invention is not limited to this. The present invention may be applied to a case where a wireless network is constructed. In this case, an infrared sensor or the like may be used to obtain the position of the truck or bus.

[0058]

According to the present invention, a mobile unit exists between a certain radio communication base and another radio communication base, not in the case of an instantaneous communication failure, and communication between the two bases is not performed. Since the wireless communication path is changed when a failure occurs almost certainly, the communication path does not change frequently as in the prior art, and when considered in a certain time unit, a good communication state can be stabilized. Can be obtained. In addition, in a situation where a communication failure is assumed to occur almost certainly, the communication path is changed prior to the occurrence of the communication failure, so that it can be said that a favorable communication situation is secured from this point as well.

Further, according to the present invention, a communication path between a plurality of wireless communication bases that are normally used is changed to avoid a communication failure without providing a spare facility in the event of a communication failure. Therefore, equipment costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a system diagram of a wireless network system according to a first embodiment of the present invention.

FIG. 2 is a functional block diagram of the mobile object tracking device according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating a configuration of an on-rail detecting unit according to the first embodiment of the present invention.

FIG. 4 is a functional block diagram of the position information distribution device according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a configuration of a management device number table according to the first embodiment of the present invention.

FIG. 6 is a functional block diagram of the wireless network management device according to the first embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a configuration of a pattern number correspondence table in the first embodiment according to the present invention.

FIG. 8 is an explanatory diagram showing a configuration of control information according to the first embodiment of the present invention.

FIG. 9 is a functional block diagram of a wireless communication base according to the first embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a communication route when a train enters a station premises according to the first embodiment of the present invention.

FIG. 11 is an explanatory diagram showing a communication route when a train enters the station yard from another direction in the first embodiment according to the present invention.

FIG. 12 is an explanatory diagram showing a wireless configuration pattern table according to the first embodiment of the present invention.

FIG. 13 is a system diagram of a wireless network system according to a second embodiment of the present invention.

FIG. 14 is a functional block diagram of a mobile object position estimation device according to a second embodiment of the present invention.

FIG. 15 is an explanatory diagram illustrating a configuration of a movement plan table according to the second embodiment of the present invention.

[Explanation of symbols]

1 ... train, 2 ... track, 5 ... station, 10 ... mobile tracking device,
DESCRIPTION OF SYMBOLS 11 ... On-line detection part, 20 ... Position information distribution apparatus, 30 ... Wireless network management apparatus, 31 ... Position acquisition part, 33 ... Communication path setting part, 41 ... Network control part, 60 ... Wireless network, 70 ... Apparatus, 600, 6
01, 602, 603: wireless communication base.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Masayasu Futagawa             Hitachi, Ibaraki Pref.             Hitachi, Ltd., Hitachi Laboratory F term (reference) 5K067 AA21 BB41 BB43 EE02 EE10                       EE16 EE24 FF03 HH22 HH23                       JJ43 JJ53

Claims (9)

[Claims] 1. A wireless network management apparatus for managing a wireless network through which a mobile passes between at least two of a plurality of communication base stations performing wireless communication with each other, comprising: A position acquisition unit for acquiring, and a communication path setting unit for determining a communication path between the plurality of communication base stations, which can avoid a communication failure due to the moving object in accordance with the position of the moving object acquired by the position acquisition unit. And wireless network control means for controlling the plurality of communication base stations so that communication between the plurality of communication base stations is performed on the communication path set by the communication path setting means. A wireless network management device, characterized in that: 2. The wireless network management device according to claim 1, wherein said communication path setting means is provided for each of a plurality of said communication base stations which can avoid a communication failure due to said mobile at each position of said mobile. Path storage means for storing a plurality of communication paths, and a communication path corresponding to the position of the mobile object acquired by the position acquisition means from among the plurality of communication paths stored in the path storage means A wireless network management device, comprising: 3. The wireless network management device according to claim 2, wherein said wireless network control means establishes wireless communication with each communication base for each of said plurality of communication paths stored in said path storage means. Control information storage means for storing, as control information, a communication base of a communication partner to be disconnected and / or a communication partner to be disconnected, and when the communication path setting means sets a communication path, control corresponding to the communication path A wireless network management device, comprising: control information extracting means for extracting information; and communication means for notifying the control information extracted by the control information extracting means to the wireless network. 4. A wireless network system comprising: the wireless network management device according to claim 1; and the wireless network managed by the wireless network management device. . 5. The wireless network management device according to claim 1, wherein a position of the moving object is detected, and the position acquisition unit of the wireless network management device informs the position of the moving object. A wireless network system, comprising: 6. The wireless network management device according to claim 1, further comprising: assuming a position of said mobile object, and assuming a position of said mobile object in said position acquisition means of said wireless network management device. A wireless network system, comprising: 7. The wireless network system according to claim 6, wherein said position assuming means stores clock means for measuring a current time, and stores each time and a scheduled position of said moving body in association with each other. And a position extracting means for extracting a scheduled position of the moving body at a current time indicated by the clock means from the storage means. 8. The wireless network system according to claim 4, wherein the wireless network is arranged in a train station yard, and the moving object is the train. Wireless network system. 9. A wireless network management method for managing a wireless network through which a mobile passes between at least two of a plurality of communication base stations that perform wireless communication with each other, comprising: A communication path setting for defining a communication path between the plurality of communication base stations, which can avoid a communication failure due to the moving body according to the position of the moving body obtained by the position obtaining means. And a wireless network control step of controlling the plurality of communication base stations so that communication between the plurality of communication base stations is performed on the communication path set by the communication path setting means. Characteristic wireless network management method.