WO2014125761A1

WO2014125761A1 - Wireless transmission apparatus, communication system, and communication trouble control method

Info

Publication number: WO2014125761A1
Application number: PCT/JP2014/000150
Authority: WO
Inventors: 裕明中島
Original assignee: 日本電気株式会社
Priority date: 2013-02-12
Filing date: 2014-01-15
Publication date: 2014-08-21
Also published as: JPWO2014125761A1

Abstract

The objective of the invention is to provide a wireless transmission apparatus that can continue communications even when a trouble has occurred either on a wireless channel established between the local wireless transmission apparatus and another wireless transmission apparatus or on a communication channel established between the local wireless transmission apparatus and a node apparatus. A wireless transmission apparatus (10) of the invention comprises: a wireless communication unit (12) that communicates with another wireless transmission apparatus, which is opposed to the local wireless transmission apparatus, via a wireless channel; a link aggregation communication unit (11) that communicates with an opposed communication apparatus (30) via a first communication channel that is one of a plurality of communication channels belonging to a link aggregation group established in the communication apparatus (30); a trouble detection unit (13) that detects a communication trouble having occurred on at least one of the wireless channel and the first communication channel; and a communication control unit (14) that stops the communications in the wireless communication unit (12) and in the link aggregation communication unit (11) when the communication trouble has been detected by the trouble detection unit (13).

Description

Wireless transmission device, communication system, and communication failure control method

The present invention relates to a wireless transmission device, a communication system, and a communication failure control method, and more particularly, to a wireless transmission device, a communication system, and a communication failure control method that perform route detour processing when a communication failure occurs.

Wireless communication paths are often used for communication between node devices in a communication network such as between server devices or between base stations. By using the wireless transmission path for communication between the node devices, the laying cost of the wired cable can be reduced. When a wireless transmission path is used for communication between node devices, two wireless transmission devices are arranged at opposite positions between the node devices. Due to an increase in the number of base stations accompanying an increase in traffic, the number of wireless transmission devices arranged in a communication network is also increasing. Here, in order to realize a reduction in the area where the wireless transmission device is installed, it is desired that the wireless transmission device be downsized. Further, while miniaturization of the wireless transmission device is desired, in order to protect traffic, it is necessary to make the wireless transmission path or the wireless transmission device redundant. When downsizing a wireless transmission device, it becomes difficult to duplicate circuits or parts in the wireless transmission device. In such a case, duplication of the radio transmission path is realized by installing two radio transmission apparatuses themselves.

For example, duplexing of wireless transmission paths can be easily realized by connecting one node device and two wireless transmission devices using an optical Y cable. However, due to the nature of the Y cable, the Y cable cannot be used when the node device is an electrical interface.

Therefore, a configuration is used in which link aggregation is applied to two communication lines between one node device or a switch device connected to the node device and the two wireless transmission devices for duplexing.

Patent Document 1 discloses a configuration in which link aggregation is applied to a plurality of wireless lines between a transmission-side wireless communication device and a reception-side wireless communication device. Patent Document 2 also discloses a configuration example of a multiplex radio apparatus in which link aggregation is applied to a plurality of radio channels.

JP 2012-165037 A JP 2012-124596 A

In the wireless communication devices of Patent Documents 1 and 2, when a failure occurs in one wireless line among a plurality of wireless lines to which link aggregation is applied, the use of the wireless line in which the failure has occurred is stopped. Change the aggregation setting. However, Patent Documents 1 and 2 disclose a configuration in which link aggregation is applied to a plurality of radio channels in the same device, but a configuration in the case of applying link aggregation across a plurality of devices is disclosed. Not. Here, for example, the node device and the wireless transmission device are 1 to N (N is an integer equal to or greater than 2), and link aggregation is applied to a plurality of communication lines between the node device and the plurality of wireless transmission devices, and wireless communication is performed. A description will be given of a case where the transmission apparatus communicates with a facing wireless transmission apparatus via a wireless line.

In such a configuration, when a failure occurs in a communication line to which link aggregation is applied, the wireless transmission device changes the link aggregation setting as described in Patent Documents 1 and 2 to change the communication line in which the failure has occurred. Even if the operation is stopped, data is transmitted from the opposing wireless transmission device because the wireless line side is operating normally. In such a case, there arises a problem that the wireless transmission device cannot transmit data transmitted from the opposite wireless transmission device to the node device. Further, when a failure occurs in the wireless line, the wireless transmission device does not change the link aggregation setting because no failure has occurred in the communication line for which the link aggregation is set. Therefore, there arises a problem that the wireless transmission device cannot transmit data transmitted from the node device to the opposite wireless transmission device.

An object of the present invention is to provide a wireless transmission device, a communication system, and a communication failure control method that solve the above-described problems.

A wireless transmission device according to a first aspect of the present invention includes a wireless communication unit that communicates with a facing wireless transmission device via a wireless line, and a plurality of communication lines that belong to a link aggregation group set in the facing communication device A link aggregation communication unit that communicates with the communication device via a first communication line, a failure detection unit that detects a communication failure that has occurred in at least one of the wireless line and the first communication line, A communication control unit that stops communication in the wireless communication unit and the link aggregation communication unit when a communication failure is detected by the failure detection unit.

A communication system according to a second aspect of the present invention uses a first wireless transmission device, a second wireless transmission device that communicates with the first wireless transmission device via a wireless line, and a plurality of communication lines. A link aggregation group, and a communication device that communicates with the first wireless transmission device via a first communication line included in the plurality of communication lines, wherein the first wireless transmission device includes: A communication failure that occurs in at least one of the wireless line and the first communication line is detected, and communication via the wireless line and the first communication line is stopped when the communication failure is detected It is.

A communication failure control method according to a third aspect of the present invention includes a wireless communication unit that communicates with a facing wireless transmission device via a wireless line, and a plurality of communications that belong to a link aggregation group set in the facing communication device. A communication failure that occurs in at least one of the link aggregation communication units that communicate with the communication device via the first communication line among the lines is detected, and when the communication failure is detected, the communication control unit Communication in the radio communication unit and the link aggregation communication unit is stopped.

According to the present invention, a wireless transmission device capable of continuing communication even when a failure occurs in either a wireless line set between wireless transmission devices or a communication line set between node devices, It is an object of the present invention to provide a communication system and a communication failure control method.

1 is a configuration diagram of a communication system according to a first exemplary embodiment; FIG. 3 is a configuration diagram of a communication system according to a second exemplary embodiment. FIG. 3 is a configuration diagram of a communication system according to a second exemplary embodiment. FIG. 10 is a diagram for explaining a flow of processing when a failure is detected in the active wireless transmission device according to the second embodiment; FIG. 10 is a diagram for explaining a processing flow when the standby radio transmission apparatus according to the second embodiment operates as an active apparatus. FIG. 6 is a configuration diagram of a communication system according to a third exemplary embodiment. FIG. 6 is a configuration diagram of a communication system according to a third exemplary embodiment. FIG. 10 is a diagram for explaining a flow of processing when a failure is detected in an active wireless transmission device according to a third embodiment; FIG. 10 is a diagram for explaining a processing flow when the standby radio transmission apparatus according to the third embodiment operates as an active apparatus; FIG. 6 is a configuration diagram of a communication system according to a fourth exemplary embodiment.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. A configuration example of a communication system according to the first exemplary embodiment of the present invention will be described with reference to FIG. The communication system of FIG. 1 includes a wireless transmission device 10, a wireless transmission device 20, and a communication device 30.

The communication device 30 may be a server device, a base station, an exchange, or a core network device in a mobile communication network. In order to relay data between the communication device 30 and another communication device, the wireless transmission device 10 and the wireless transmission device 20 are arranged between the communication device 30 and the other communication device. Further, the wireless transmission device 10 and the wireless transmission device 20 are arranged to face each other via a wireless line.

The wireless transmission device 10 performs data transmission via a wireless line with the wireless transmission device 20 disposed opposite to the wireless transmission device 10. The wireless transmission device 10 may be a device that performs wireless communication with the wireless transmission device 20 using a high frequency band such as several GHz. Further, the wireless transmission device 10 communicates with the communication device 30. The communication line between the wireless transmission device 10 and the communication device 30 may be a wired line or a wireless line. In the following, since the wireless transmission device 10 and the wireless transmission device 20 have the same configuration, the configuration example of the wireless transmission device 10 will be described, and the description of the configuration example of the wireless transmission device 20 will be omitted.

The wireless transmission device 10 includes a link aggregation communication unit 11, a wireless communication unit 12, a failure detection unit 13, and a communication control unit 14. The wireless communication unit 12 communicates with the opposing wireless transmission device 20 via a wireless line.

The link aggregation communication unit 11 communicates with the communication device 30 via one communication line among a plurality of communication lines belonging to the link aggregation group set in the opposing communication device 30. The communication device 30 has a link aggregation function that bundles a plurality of physical communication lines and handles them as one logical communication line. Here, one logical communication line obtained by bundling a plurality of physical communication lines is referred to as a link aggregation group. The communication device 30 is connected to a plurality of wireless transmission devices in addition to the wireless transmission device 10 via physical communication lines. That is, the communication device 30 sets a link aggregation group by bundling a plurality of physical communication lines with different wireless transmission devices connected thereto.

In this figure, the communication device 30 and the wireless transmission device 10 are connected via a single physical communication line, but may be connected via two or more physical lines belonging to the same link aggregation group. Good.

The failure detection unit 13 detects a communication failure that has occurred in at least one of a wireless line set with the wireless transmission device 20 and a communication line set with the communication device 30. The communication failure in the wireless line includes an event in which the reception power is lower than a predetermined value due to fading between the

wireless transmission apparatuses

10 and 20. Further, the communication failure in the wireless line includes an event in which communication between the wireless transmission device 10 and the wireless transmission device 20 becomes impossible due to a failure of the wireless communication unit 12 or a failure of the wireless transmission device 20.

When a wireless line is set up with the communication device 30, a communication failure in the communication line has received power lower than a predetermined value due to fading that occurs between the wireless transmission device 10 and the communication device 30. Event to include. Further, the communication failure in the communication line includes an event in which communication between the wireless transmission device 10 and the communication device 30 becomes impossible due to a failure of the link aggregation communication unit 11 or a failure of the communication device 30.

When a wired line is set between the communication apparatus 30 and the communication line 30, communication failure in the communication line is caused by communication between the wireless transmission apparatus 10 and the communication apparatus 30 due to a failure of the link aggregation communication unit 11 or a failure of the communication apparatus 30. Including events that cannot be performed (for example, events that cause link down). Further, the communication failure in the communication line includes an event in which communication between the wireless transmission device 10 and the communication device 30 becomes impossible due to disconnection of the wired cable or the like.

The communication control unit 14 stops communication in the wireless communication unit 12 and the link aggregation communication unit 11 when a communication failure is detected by the failure detection unit 13. The communication control unit 14 may stop communication by stopping the supply of power necessary for operating the wireless communication unit 12 and the link aggregation communication unit 11. Alternatively, the communication control unit 14 may stop communication by closing a port in which a communication line with the communication device 30 or a wireless line with the wireless transmission device 20 is set.

As described above, the communication control unit 14 stops communication in the wireless communication unit 12 and the link aggregation communication unit 11 when a communication failure is detected in the failure detection unit 13. When the communication control unit 14 stops communication in the wireless communication unit 12, the wireless transmission device 20 facing the wireless transmission device 10 transmits data to another wireless transmission device used as a spare device of the wireless transmission device 10, for example. Send. Furthermore, when the communication control unit 14 stops the communication in the link aggregation communication unit 11, the communication device 30 transmits the data destined for the wireless transmission device 10 via another communication line belonging to the same link aggregation group. Data is transmitted to another wireless transmission device used as a spare device of the wireless transmission device 10.

In this way, when the wireless transmission device 10 detects a communication failure on either the wireless line with the wireless transmission device 20 or the communication line with the communication device 30, data passing through the wireless transmission device 10 is detected. Can be detoured to another transmission line so as not to pass through the wireless transmission device 10.

In other words, for example, when the failure detection unit 13 detects a communication failure in a wireless line with the wireless transmission device 20, the communication control unit 14 performs communication not only in the wireless communication unit 12 but also in the link aggregation communication unit 11. Can be stopped. Furthermore, when the failure detection unit 13 detects a communication failure in the communication line with the communication device 30, the communication control unit 14 stops communication not only in the link aggregation communication unit 11 but also in the wireless communication unit 12. Can do. In this way, the failure detection unit 13 and the communication control unit 14 can control the link aggregation communication unit 11 and the wireless communication unit 12 in cooperation with each other. As a result, even when a communication failure occurs on either the wireless line with the wireless transmission device 20 or the communication line with the communication device 30, a state in which data communication cannot be performed between the communication devices is avoided. Communication can be continued.

(Embodiment 2)
Subsequently, a configuration example of the communication system according to the second exemplary embodiment of the present invention will be described with reference to FIG. The communication system in FIG. 2 includes a wireless transmission device system 50, a wireless transmission device system 60, and an L2SW (Layer 2 Switch) 31. The L2SW 31 is an example of the communication device 30.

Since the wireless transmission device system 50 and the wireless transmission device system 60 have the same configuration, a configuration example of the wireless transmission device system 50 will be described below, and a detailed description of the wireless transmission device system 60 will be omitted.

The wireless transmission device system 50 includes an active wireless transmission device 51, a standby wireless transmission device 53, and a hybrid device 55. The active wireless transmission device 51 is a wireless transmission device that is currently operating. On the other hand, the standby wireless transmission device 53 is a wireless transmission device that is used in place of the active wireless transmission device 51 when a failure occurs in the active wireless transmission device 51. The active wireless transmission device 51 and the standby wireless transmission device 53 have the same configuration as the wireless transmission device 10.

The L2SW 31 sets a physical line with the active wireless transmission device 51 and further sets a physical line with the standby wireless transmission device 53. Further, the L2SW 31 sets one link aggregation group by bundling the physical lines set between the active wireless transmission device 51 and the standby wireless transmission device 53, respectively.

When a single link aggregation group is set by bundling a plurality of physical lines, the L2SW 31 normally transmits data to the active wireless transmission device 51, and a communication failure occurs between the L2SW 31 and the active wireless transmission device 51. In this case, the data transmission destination may be switched to the standby wireless transmission device 53 using the link aggregation function.

Alternatively, the L2SW 31 transmits data to the active wireless transmission device 51 and the standby wireless transmission device 53 during normal operation, and the standby wireless transmission device 53 discards the received data while operating as the standby device. Good. That is, the active wireless transmission device 51 and the standby wireless transmission device 53 may transmit the data received from the L2SW 31 to the wireless transmission device system 60 when operating as the active device.

Here, when the L2SW 31 does not have a link aggregation function, when a communication failure occurs between the L2SW 31 and the active wireless transmission device 51, the L2SW 31 reserves a data transmission destination by updating the MAC address management table. Switching to the wireless transmission device 53 is possible. In general, when the L2SW has not received a packet from the port connected to the backup wireless transmission device 53, the current use is performed for a set time (for example, 300 seconds) after the previous learning of the MAC address management table. Continue to send packets to the port connected to the wireless transmission device 51. After the set time elapses, the L2SW transmits a packet to all ports and newly updates the MAC address management table. Therefore, in order to update the MAC address management table, it takes a maximum time (several tens to hundreds of seconds) set as the set time. On the other hand, when the L2SW 31 switches the data transmission destination from the active wireless transmission device 51 to the standby wireless transmission device 53 using the link aggregation function, the L2SW 31 is connected to each of the active wireless transmission device 51 and the standby wireless transmission device 53. Existing physical communication lines belong to the same link aggregation group and are set as the same logical communication line. For this reason, when a communication failure occurs between the L2SW 31 and the active wireless transmission device 51, the L2SW 31 switches to another physical communication line belonging to the same link aggregation group, so that the communication line of the standby wireless transmission device 53 can be obtained within a few seconds. Can be switched.

The hybrid device 55 is a device that is used to perform communication using a single wireless line between the wireless transmission device system 50 having the active wireless transmission device 51 and the standby wireless transmission device 53 and the wireless transmission device system 60. . Alternatively, the hybrid device 55 may set a wireless line between the wireless transmission device system 50 and the wireless transmission device system 60 so that there is one line as a transmission line and one line as a reception line. Here, a line used when data is transmitted from the wireless transmission device system 50 to the wireless transmission device system 60 is a transmission line, and a line used when the wireless transmission device system 50 receives data from the wireless transmission device system 60 is a transmission line. Use a receiving line.

By using the hybrid device 55, it is possible to reduce the number of wireless lines used between the wireless transmission device system 50 and the wireless transmission device system 60, and hence it is possible to reduce the wireless frequency used.

When a communication failure occurs in at least one of the communication line on the L2SW 31 side of the working wireless transmission apparatus 51 or the wireless line on the wireless transmission apparatus system 60 side, the wireless transmission apparatus system 50 communicates on the L2SW 31 side of the working wireless transmission apparatus 51. And the communication on the wireless line on the wireless transmission device system 60 side is stopped. As a result, the radio transmission apparatus system 50 can change the data transmission path so that the data relayed via the active radio transmission apparatus 51 is relayed via the backup radio transmission apparatus 53.

Subsequently, a detailed configuration example of the wireless transmission device system 50 will be described with reference to FIG. The active wireless transmission device 51 in the wireless transmission device system 50 includes a transmission unit 61 and a reception unit 62. Further, the standby radio transmission apparatus 53 also has a transmission unit 63 and a reception unit 64. In the active wireless transmission device 51 and the standby wireless transmission device 53, the transmission indicates that the data transmitted from the L2SW 31 is transmitted to the wireless transmission device system 60. In the active wireless transmission device 51 and the standby wireless transmission device 53, reception indicates that the data transmitted from the wireless transmission device system 60 is transmitted to the L2SW 31.

The transmission unit 61 and the reception unit 62 may include the link aggregation communication unit 11, the wireless communication unit 12, the failure detection unit 13, and the communication control unit 14 illustrated in FIG. Alternatively, the transmission unit 61 and the reception unit 62 may share the link aggregation communication unit 11, the wireless communication unit 12, the failure detection unit 13, and the communication control unit 14. The same applies to the transmission unit 63 and the reception unit 64 in the standby radio transmission apparatus 53.

The hybrid device 55 includes a transmission HYB (hybrid) unit 65 and a reception HYB unit 66. The transmission HYB unit 65 transmits the data transmitted from the transmission unit 61 and the transmission unit 63 to the wireless transmission device system 60 via a wireless line. The reception HYB unit 66 transmits the data transmitted from the wireless transmission device system 60 via the wireless line to the reception unit 62 and the reception unit 64. Here, the reception HYB unit 66 transmits the data transmitted from the wireless transmission device system 60 to the reception unit 62, further duplicates the data transmitted from the wireless transmission device system 60, and receives the copied data as the reception unit 64. May be sent to. The reception unit 64 may discard the data transmitted from the reception HYB unit 66 when the backup wireless transmission device 53 is operating as a backup device. In this case, the L2SW 31 receives data from the receiving unit 62 of the currently used wireless transmission device 51 that is currently operating.

In this figure, a configuration (FDD wireless transmission system) in which a transmission wireless line and a reception wireless line are provided using different frequency bands is described. Here, the transmission HYB unit 65 and the reception HYB unit 66 are provided with only one line as a transmission wireless line and a reception wireless line between the wireless transmission apparatus system 60 using the same circuit or the like. (TDD wireless transmission system).

Subsequently, the flow of processing when a failure is detected in the active wireless transmission device 51 according to the second embodiment of the present invention will be described with reference to FIG. First, the failure detection unit 13 detects a failure that has occurred in either the communication line set with the L2SW 31 or the wireless line set with the wireless transmission device system 60 (S11).

The failure detection unit 13 may detect that a communication failure has occurred, for example, when the received power of data transmitted from the wireless transmission device system 60 is smaller than a predetermined value. Alternatively, the failure detection unit 13 may transmit / receive a signal for confirming the normality of the communication line, for example, a health check signal, to / from the L2SW 31 and the wireless transmission device system 60. In this case, the failure detection unit 13 may detect that a communication failure has occurred when a signal for confirming normality cannot be received from the communication partner device.

Next, when a failure is detected in the failure detection unit 13, the communication control unit 14 stops data transmission in the link aggregation communication unit 11 and the wireless communication unit 12 (S12). The stop of data transmission may stop the supply of power to the link aggregation communication unit 11 and the wireless communication unit 12, and a line set between the link aggregation communication unit 11 and the wireless communication unit 12 facing the opposite device. It may be in a closed state.

Subsequently, a processing flow when the standby radio transmission apparatus 53 operates as the active apparatus will be described with reference to FIG. The standby wireless transmission device 53 may stop the wireless communication unit 12 while operating as a standby device. In this way, when the standby wireless transmission device 53 operates as a backup device, it is possible to reduce power consumption by stopping unnecessary circuits or components.

When the failure is detected in the active wireless transmission device 51 and the link aggregation communication unit 11 and the wireless communication unit 12 are stopped, the L2SW 31 transmits the data transmitted with the active wireless transmission device 51 as the destination to the standby wireless transmission device 53. Is sent as a destination. That is, the L2SW 31 detects that a failure has occurred in the communication line with the active wireless transmission device 51, and transmits the data transmitted with the active wireless transmission device 51 as a destination to other links belonging to the same link aggregation group. Send via communication line. In such a case, first, the link aggregation communication unit 11 of the standby radio transmission apparatus 53 receives the main signal from the L2SW 31 (S21). The main signal may be, for example, video data, moving image data, audio data, character data, or the like.

Next, the link aggregation communication unit 11 notifies the communication control unit 14 that the main signal has been received (S22).

Next, the communication control unit 14 releases the suspension state of the wireless communication unit 12 and activates the wireless communication unit 12 when the link aggregation communication unit 11 is notified that the main signal has been received (S23). . As a result, the subsequent wireless transmission with the wireless transmission device system 60 is performed using the wireless communication unit 12 of the standby wireless transmission device 53.

In step S22, the link aggregation communication unit 11 notifies the communication control unit 14 that the main signal has been received, and temporarily stores the received main signal in a data storage unit or the like in the standby wireless transmission device 53. Also good. In this case, when activated by the communication control unit 14, the wireless communication unit 12 extracts the main signal temporarily stored in the data storage unit, and transmits the extracted main signal to the wireless transmission device system 60.

The standby radio transmission apparatus 53 can start the radio communication unit 12 at the timing of receiving the main signal from the L2SW 31 by performing the processing in FIG.

As described above, by using the radio transmission apparatus system 50 according to the second exemplary embodiment of the present invention, the active radio transmission apparatus 51 has a fault on either the radio line side or the communication line side with the L2SW 31. Even when it happens, the link aggregation communication unit 11 and the wireless communication unit 12 are stopped. As a result, the data that has been routed through the active wireless transmission device 51 is relayed to the standby wireless transmission device 53 by detour, so that data loss due to a failure of the active wireless transmission device 51 can be avoided.

Furthermore, by using the hybrid device 55, the active wireless transmission device 51 and the standby wireless transmission device 53 can be accommodated so as to use the same antenna. *

(Embodiment 3)
Subsequently, a configuration example of a communication system according to the third exemplary embodiment of the present invention will be described with reference to FIG. The communication system in this figure has a wireless transmission system 70 and an L2SW 31. The wireless transmission system 70 includes a working wireless transmission device 71, a standby wireless transmission device 72, a working wireless transmission device 73, a standby wireless transmission device 74, and a hybrid device 75.

The active wireless transmission device 71, the standby wireless transmission device 72, the active wireless transmission device 73, and the standby wireless transmission device 74 are connected to the L2SW 31 via a communication line. In addition, the L2SW 31 sets four communication lines connected to the active wireless transmission device 71, the standby wireless transmission device 72, the active wireless transmission device 73, and the standby wireless transmission device 74 in the same link aggregation group. Further, the radio transmission system 70 of this figure is configured to have two active radio transmission apparatuses and two standby radio transmission apparatuses. For example, one active radio transmission apparatus and one spare radio transmission apparatus are provided. Three may be used. The number of active wireless transmission devices and backup wireless transmission devices included in the wireless transmission system 70 can be arbitrarily changed.

Similarly to the hybrid device 55 in FIG. 2, the hybrid device 75 is configured to establish a wireless link between the opposite wireless transmission system, the active wireless transmission device 71, the standby wireless transmission device 72, the active wireless transmission device 73, and the standby wireless transmission device. The wireless line and each wireless transmission device are connected so that 74 can be shared. For example, the hybrid device 75 outputs the data output from the transmission unit of each wireless transmission device to one wireless line, copies the data transmitted from the opposing wireless transmission system, and receives each wireless transmission device. Output to the section.

Subsequently, a configuration example of the working radio transmission apparatus 71 according to the third embodiment of the present invention will be described with reference to FIG. The active wireless transmission device 71 is connected to the opposite wireless transmission device 90 via a wireless line. Note that the standby radio transmission apparatus 72, the active radio transmission apparatus 73, and the standby radio transmission apparatus 74 have the same configuration as the active radio transmission apparatus 71, and therefore, the standby radio transmission apparatus 72, the active radio transmission apparatus 73, and the standby radio transmission apparatus. Detailed description of 74 will be omitted.

The active wireless transmission device 71 includes a link aggregation communication unit 81, a wireless communication unit 82, a failure detection unit 83, a communication control unit 84, and a switching control unit 85. The link aggregation communication unit 81, the wireless communication unit 82, the failure detection unit 83, and the communication control unit 84 are the same as the link aggregation communication unit 11, the wireless communication unit 12, the failure detection unit 13, and the communication control unit 14 of FIG. Detailed description will be omitted. The working wireless transmission device 71 is different from the wireless transmission device 10 of FIG. 1 in that it includes a switching control unit 85.

The failure detection unit 83 outputs a failure detection notification to the switching control unit 85 when it detects a failure in the communication line with the L2SW 31 or the wireless line with the opposite wireless transmission device 90.

When the switching control unit 85 receives the failure detection notification, the switching control unit 85 determines a backup wireless transmission device that is a detour destination of data that has passed through the active wireless transmission device 71. It is assumed that there are two backup

radio transmission apparatuses

72 and 74 serving as detour destination candidates.

For example, when there are a plurality of spare wireless transmission devices that are candidates for a bypass destination, the switching control unit 85 may select the standby wireless transmission devices that are candidates for a bypass destination in ascending order of the device number. For example, when there are backup

radio transmission apparatuses

72 and 74, the switching control unit 85 first selects the backup radio transmission apparatus 72 as a detour destination candidate.

Alternatively, the switching control unit 85 may select the backup radio transmission device based on the data transfer capability when there are a plurality of backup radio transmission devices that are candidates for the detour destination. For example, when the standby wireless transmission device 72 is equipped with a CPU having higher performance than the standby wireless transmission device 74, the switching control unit 85 selects the standby wireless transmission device 72 as a detour destination candidate. May be. The switching control unit 85 may select the backup radio transmission apparatus using a different method other than the selection process of the backup radio transmission apparatus described above.

When it is possible to confirm that the selected backup radio transmission device is normal, the switching control unit 85 notifies the communication control unit 84 that the confirmation regarding the normality of the backup radio transmission device has been completed. When the communication control unit 84 receives a notification from the switching control unit 85 that the confirmation regarding the normality of the standby radio transmission device is completed, the communication control unit 84 stops the link aggregation communication unit 81 and the radio communication unit 82 and sets the active radio transmission device. The data passing through 71 is bypassed to the selected backup radio transmission apparatus.

The switching control unit 85 may select another backup radio transmission device and check the normality when it cannot be confirmed that the backup radio transmission device selected first is normal.

Alternatively, the switching control unit 85 periodically checks the normality of the standby radio transmission apparatus, and when the fault detection unit 83 detects a fault, it switches to the standby radio transmission apparatus that has been determined to be operating normally in advance. Data may be bypassed.

When the backup wireless transmission device 72 is selected as a bypass backup wireless transmission device, the backup wireless transmission device 72 transmits the data transmitted to the active wireless transmission device 71 to the L2SW 31 and the opposite wireless transmission device 90. You may notify to the backup radio transmission apparatus 72 so that it may transmit. As a result, the data transmission destination in the L2SW 31 and the opposed wireless transmission device 90 can be changed.

Subsequently, the flow of processing when a failure occurs in the active wireless transmission device 71 according to the third embodiment of the present invention will be described with reference to FIG.

First, the failure detection unit 83 detects that a failure has occurred in either the communication line with the L2SW 31 or the wireless line with the opposite wireless transmission device 90 (S31).

Next, the switching control unit 85 notifies the standby radio transmission apparatus selected as a data detour destination candidate that a failure has occurred (S32). Here, it is assumed that the switching control unit 85 selects the standby wireless transmission device 72 as a data detour destination candidate.

Next, the switching control unit 85 receives a response message indicating that the standby radio transmission device 72 is operating normally from the backup radio transmission device 72 that has notified that a failure has occurred within a predetermined time. It is determined whether or not (S33).

When the switching control unit 85 receives a response message indicating that the standby wireless transmission device 72 is operating normally from the standby wireless transmission device 72 within a predetermined time, the switching control unit 85 transmits the standby wireless transmission to the communication control unit 84. Notify that device 72 is normal. When notified that the backup radio transmission device 72 is normal, the communication control unit 84 puts the link aggregation communication unit 81 and the radio communication unit 82 into a stopped state (S34).

The switching control unit 85 does not receive a response message indicating that the standby radio transmission device 72 is operating normally from the standby radio transmission device 72 within a predetermined time, or the backup radio transmission device 72. When a response message indicating that the is not normal is received, another backup radio transmission apparatus is selected. Here, the switching control unit 85 selects the backup radio transmission device 74 as another backup radio transmission device. The switching control unit 85 notifies the standby radio transmission device 74 that a failure has occurred (S35). Thereafter, the switching control unit 85 repeats the operations after step S33.

Subsequently, a processing flow of the standby radio transmission apparatus that has received the failure notification according to the third embodiment of the present invention will be described with reference to FIG. First, the backup wireless transmission device 72 selected as a data detour candidate receives a message (failure notification) indicating that a failure has occurred in the active wireless transmission device 71 from the active wireless transmission device 71 (S41).

Next, the standby radio transmission device 72 determines whether or not the own device is normal (S42). For example, the standby radio transmission device 72 confirms the radio reception power, the normality of the link state with the communication device or the device failure of the device, and the CPU usage rate value of the own device indicates a normal value. Whether the device itself is normal may be determined based on whether the health check or the like regularly performed between the control unit and the communication unit is normally performed. Alternatively, when the monitoring server on the communication network manages each device on the communication network, the standby wireless transmission device 72 may inquire about whether or not the own device is normal.

Next, when it is determined that the own apparatus is normal, the standby radio transmission apparatus 72 transmits a response message indicating that the own apparatus is normal to the active radio transmission apparatus 71 (S43). Next, the standby radio transmission device 72 activates the link aggregation communication unit 81 and the radio communication unit 82 in order to operate as the active device (S44).

Next, the standby radio transmission apparatus 72 notifies the L2SW 31 and the opposite radio transmission apparatus 90 to transmit the data that has been transmitted with the active radio transmission apparatus 71 as the destination (S45). .

In step S42, when the standby radio transmission apparatus 72 determines that the own apparatus is not normal, the backup radio transmission apparatus 72 transmits a response message indicating that the own apparatus is abnormal to the active radio transmission apparatus 71 (S45).

As described above, the working radio transmission apparatus 71 according to the third embodiment of the present invention confirms the normality of the backup radio transmission apparatus when there are a plurality of backup radio transmission apparatuses as data detour destination candidates, Data is diverted to the standby radio transmission apparatus operating normally.

The following effects can be obtained by confirming the normality of the standby radio transmission device and diverting the data to the standby radio transmission device operating normally. For example, when switching is made to bypass data to a standby wireless transmission device that is not operating normally, the standby wireless transmission device can also detect a failure and switch back to the original wireless transmission device again. Can be considered. In this way, when switching is made to bypass data to a standby radio transmission device that is not operating normally, a fault has occurred in the active radio transmission device and the backup radio transmission device, so switching and switchback are possible. It frequently occurs, and with the occurrence of data loss, the processing load on the device, the monitoring network for monitoring the device, the monitoring server, etc. also increases.

Therefore, by confirming the normality of the backup radio transmission apparatus and confirming that the backup radio transmission apparatus is operating normally, the data can be diverted to the backup radio transmission apparatus, and the above-described problems can be avoided. It can be avoided.

(Embodiment 4)
Subsequently, a configuration example of a communication system according to the fourth exemplary embodiment of the present invention will be described with reference to FIG. The communication system in FIG. 10 has the same configuration as that in FIG. However, it is possible to perform communication between the transmission unit 61 and the transmission unit 63, and to perform communication between the reception unit 62 and the reception unit 64. Different.

FIG. 10 shows that a communication failure has occurred in the communication line between the active wireless transmission device 51 and the L2SW 31, and further that a communication failure has occurred on the wireless line side of the standby wireless transmission device 53. In such a case, when Embodiments 1 to 3 are used, there is no spare wireless transmission device that is a data detour destination, and data cannot be detoured.

Therefore, as shown in FIG. 10, a communication line is set so that communication can be performed between the transmission unit 61 and the transmission unit 63, and communication is also performed between the reception unit 62 and the reception unit 64. Set up the communication line so that you can. In this way, even when a communication failure as shown in FIG. 10 occurs, the communication line between the transmission unit 61 and the transmission unit 63 and the communication line between the reception unit 62 and the reception unit 64 are established. By using it, data transmission can be continued.

Note that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention. For example, in the above embodiment, an optical interface or an electrical interface may be used between the L2SW 31 and the wireless transmission device system 50.

The present invention has been described above with reference to the embodiment, but the present invention is not limited to the above. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the invention.

This application claims priority based on Japanese Patent Application No. 2013-24323 filed on February 12, 2013, the entire disclosure of which is incorporated herein.

DESCRIPTION OF SYMBOLS 10 Wireless transmission apparatus 11 Link aggregation communication part 12 Wireless communication part 13 Failure detection part 14 Communication control part 20 Wireless transmission apparatus 30 Communication apparatus 31 L2SW
REFERENCE SIGNS LIST 50 wireless transmission device system 51 active wireless transmission device 53 standby wireless transmission device 55 hybrid device 60 wireless transmission device system 61 transmission unit 62 reception unit 63 transmission unit 64 reception unit 65 transmission HYB unit 66 reception HYB unit 70 wireless transmission system 71 Active wireless transmission device 72 Backup wireless transmission device 73 Active wireless transmission device 74 Backup wireless transmission device 75 Hybrid device 81 Link aggregation communication unit 82 Wireless communication unit 83 Fault detection unit 84 Communication control unit 85 Switching control unit 90 Opposite wireless transmission device

Claims

Wireless communication means for communicating with a wireless transmission device opposed via a wireless line;
Link aggregation communication means for communicating with the communication device via a first communication line among a plurality of communication lines belonging to a link aggregation group set in the opposing communication device;
A failure detection means for detecting a communication failure that has occurred in at least one of the wireless line and the first communication line;
And a communication control unit configured to stop communication in the wireless communication unit and the link aggregation communication unit when a communication failure is detected by the failure detection unit.
The failure detection means includes
The wireless transmission device according to claim 1, wherein the communication failure is detected according to whether received power of a signal received via the wireless line exceeds a predetermined threshold.
The failure detection means includes
3. The wireless transmission according to claim 1, wherein the communication failure is detected according to at least one of link status of the first communication line and normality confirmation data transmitted between the opposing communication devices. 4. apparatus.
When the communication failure is detected by the failure detection unit, the control unit further includes a switching control unit that notifies the switching target wireless transmission device that is switched from the standby wireless transmission device to the active wireless transmission device that the communication failure is detected. The wireless transmission device according to any one of claims 1 to 3.
The switching control means includes
The wireless transmission device according to claim 4, wherein when the switching target wireless transmission device is operating normally, the switching target wireless transmission device is notified that the communication failure has been detected.
When operating as a backup wireless transmission device,
The communication control means includes
4. The wireless transmission device according to claim 1, wherein the wireless communication unit is activated when a main signal is transmitted from the opposing communication device to the link aggregation communication unit. 5.
A first wireless transmission device;
A second wireless transmission device that communicates with the first wireless transmission device facing each other via a wireless line;
A communication device that sets a link aggregation group using a plurality of communication lines and communicates with the first wireless transmission device via a first communication line included in the plurality of communication lines;
The first wireless transmission device includes:
Detecting a communication failure occurring in at least one of the wireless line and the first communication line, and stopping communication via the wireless line and the first communication line when the communication failure is detected; Communications system.
The first wireless transmission device includes:
The communication system according to claim 7, wherein the communication failure is detected according to whether received power of a signal received via the wireless line exceeds a predetermined threshold.
The first wireless transmission device includes:
The communication system according to claim 7 or 8, wherein the communication failure is detected according to at least one of a link state of the first communication line and normality confirmation data transmitted between the opposing communication devices. .
The first wireless transmission device includes:
10. The communication device according to claim 7, wherein when the communication failure is detected, the switch target wireless transmission device that is switched from the standby wireless transmission device to the active wireless transmission device is notified that the communication failure has been detected. Communications system.
The first wireless transmission device includes:
The communication system according to claim 10, wherein when the switching target wireless transmission device is operating normally, the switching target wireless transmission device is notified that the communication failure has been detected.
When the first wireless transmission device is operating as a backup wireless transmission device,
The first wireless transmission device includes:
The communication according to any one of claims 7 to 9, wherein when a main signal is transmitted from the communication device, wireless communication means for performing wireless communication with the second wireless transmission device via a wireless line is activated. system.
A wireless communication means for communicating with an opposing wireless transmission device via a wireless line; and the communication device via a first communication line among a plurality of communication lines belonging to a link aggregation group set in the opposing communication device. Detecting a communication failure that has occurred in at least one of the link aggregation communication means for performing communication,
A communication failure control method for stopping communication in the wireless communication unit and the link aggregation communication unit using a communication control unit when the communication failure is detected.