Method for preventing communication data loop of radio transmission system

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention is to prevent an infinite transfer loop of communication data from being formed in a signal transmission line that performs data communication for performing operations such as monitoring and control of a wireless transmission device in a wireless transmission system. It relates to a communication data loop prevention method of the configured wireless transmission system.

【0002】

[Conventional technology]

Generally, as a wireless transmission system using a wireless frequency, a wireless transmission system configured to modulate the wireless frequency with a time-division-multiplexed multiplexed digital information signal is known. In this case, although there are problems peculiar to wireless transmission such as fading and interference, the characteristics of digital transmission are preserved as they are, and digitization is becoming widespread by taking advantage of its advantages. In addition, as digital wireless transmission systems for public communication, for example, short- and medium-distance systems using the 2, 11, and 15 GHz bands and long-distance and large-capacity systems of 60 GHz are practically used.

【0003】

In this type of wireless transmission system, when constructing a system for transmitting a long distance, a wireless device is installed at a predetermined distance, and the system is constructed so as to relay by the wireless device. In this case, the relay radio device is provided with two radios, and one radio transmits / receives a signal in one radio section and the other radio transmits / receives a signal in the other radio section. It is configured as follows.

【0004】

Further, considering it as a signal transmission line, it may be necessary to branch in the middle of the signal transmission line depending on the arrangement of the place where information is to be transmitted. In this case, the relay radio device is provided with three radios, and the signal transmission line is branched by configuring the three radios to transmit and receive signals in their respective radio sections. be able to.

【0005】

FIG. 5 is a schematic explanatory view showing a system configuration example of a wireless transmission system constituting the signal transmission line. That is, in FIG. 5, reference numeral 10 indicates a base station, and a plurality of wireless transmission devices 12-1, 12-2, and 12-3 are provided in the base station 10, and between these wireless transmission devices. The wireless transmission devices 12-1, 12-2, and 12-3 are interconnected by a wired transmission line 14, and the wireless transmission devices 12-1, 12-2, and 12-3 are connected to the other base stations 20, 30, and 40, respectively, and the wireless transmission lines 16-20 and 16-30, respectively. , 16-40 are connected respectively.

【0006】

In the signal transmission line configured in this way, if three or more wireless transmission devices connected to the relay section are provided, it is possible to receive control data from a plurality of directions and transmit control data in a plurality of directions. For example, as shown in FIG. 6, when three wireless transmission devices 12-1, 12-2, and 12-3 are provided in the base station 10, the data received by the wireless transmission device 12-1 is this. If the data is not addressed to the wireless transmission device 12-1, it is branched and transmitted to the wireless transmission device 12-2 and the wireless transmission device 12-3 using the wired transmission line 14.

【0007】

As described above, in the data communication method in the conventional wireless transmission system, since data can be transferred in a plurality of directions, a loop portion is formed on the signal transmission line. Therefore, if the wireless transmission device that is the target of the control data is not located in the loop portion of the signal transmission line, there is a problem that the communication data is infinitely transferred in the loop portion. In order to eliminate such a problem, it is necessary to eliminate the part where the loop is formed in the signal transmission line in the wireless transmission system, but in this case, there is a drawback that the versatility of the entire system deteriorates. is there.

【0008】

[Problems to be Solved by the Invention]

Therefore, as a result of diligent research and study, the present inventor has provided three or more wireless transmission devices connected to the relay section on the signal transmission line in the wireless transmission system to transfer data in a plurality of directions. This communication data can be added to the communication data transmitted and received between the wireless transmission devices in order to prevent the communication data from being transferred indefinitely even if a loop portion is formed on the signal transmission line. When unique information for recognition, that is, "source ID number", "communication data number", etc. is added to receive communication data having the same unique information again between the wireless transmission devices, this communication is performed. By setting to discard the data, it was found that the problem that the communication data is transferred indefinitely in the loop portion of the signal transmission line described above can be easily solved.

【0009】

Therefore, an object of the present invention is a signal for performing data communication for performing operations such as monitoring and control of a wireless transmission device when three or more wireless transmission devices are provided in a relay section in a wireless transmission system. It is an object of the present invention to provide a communication data loop prevention method of a wireless transmission system capable of effectively preventing an infinite transfer loop of communication data from being formed in a transmission line.

【0010】

[Means for solving problems]

In order to achieve the above object, the communication data loop prevention method of the wireless transmission system according to the present invention monitors and controls the wireless transmission device in the wireless transmission system in which a network in which a plurality of wireless devices are connected is constructed. To the signal transmission line that performs data communication for performing operations such as, etc., unique information is added to the communication data, and the communication data to which the same unique information is added is re-received in the wireless transmission device on the signal transmission line. The feature is that the re-received communication data is set to be discarded when the data is received.

【0011】

In this case, the unique information in the communication data is characterized by being composed of a source ID number and a communication data number.

【0012】

Further, the communication data loop prevention method of the wireless transmission system according to the present invention determines whether or not the received communication data in the wireless transmission device is data to which the same unique information as the previously received data is added. Judgment step, the step of discarding the received data when the data has the same unique information as the previously received data, and the case where the data does not have the same unique information as the previously received data. A step of determining whether or not the data is addressed to the own station, a step of performing a predetermined control process based on the communication data when the data is addressed to the own station, and a communication data when the data is not addressed to the own station. It is characterized by including a step of performing the transfer process of the above and a step of storing the unique information of the received data subjected to the control process and the transfer process.

【0013】

BEST MODE FOR CARRYING OUT THE INVENTION

Next, an example of the communication data loop prevention method of the wireless transmission system according to the present invention will be described in detail below with reference to the accompanying drawings.

【0014】

FIG. 1 is an explanatory diagram showing a case where a loop portion is formed on a signal transmission line of a wireless transmission system when the communication data loop prevention method of the wireless transmission system according to the present invention is implemented. That is, in FIG. 1, the wireless transmission devices B, C, and G are connected to each other on the wired transmission line at the base station 10, and the wireless transmission devices A and K are connected to each other on the wired transmission line at the base station 20. The wireless transmission devices D, E, and J are connected to each other on the wired transmission line to the base station 30, and the wireless transmission devices H and I are connected to each other on the wired transmission line to the base station 40. A wireless transmission device F is provided in 50. The wireless transmission devices of these base stations 10 to 50 are each connected to the wireless transmission devices of other base stations 40 by a wired transmission line.

【0015】

On the signal transmission line of the wireless transmission system configured in this way, the base stations 10, 30 and 40 are connected by the wireless transmission line, and the wireless transmission devices C, D, J, I, H and G are connected. Form a loop. Therefore, in this case, when the control data addressed to the wireless transmission device F is transmitted from the wireless transmission device K, the control data is sequentially transferred in the order of the wireless transmission devices K, A, B, C, D, E, and F. However, control data is also transferred from the wireless transmission device B to the wireless transmission device G. As a result, control data having the same contents is transferred in the order of the wireless transmission devices G, H, I, J, D, and C. When the loop-shaped signal transmission line is formed in this way, the control data having the same contents is transferred infinitely on the loop-shaped signal transmission line.

【0016】

FIG. 2 shows a configuration example of the wireless transmission device shown in FIG. 1, for example, showing a connection configuration of wireless transmission devices B, C, and G provided in the base station 10. In this case, each wireless transmission device B, C, G includes a receiver RCV and a transmitter TRM, respectively, and the receiver RCV of each wireless transmission device B, C, G and another wireless transmission device B, C, G. The transmitter TRM is connected to each other by wire. For example, the receiving unit RCV of the wireless transmission device B is connected by wire to the transmitting unit TRM of each of the other wireless transmission devices C and G. Each of the wireless transmission devices B, C, and G is provided with a main control unit MCU for mutually controlling the receiving unit RCV and the transmitting unit TRM. In addition, the history information management table is connected to the main control unit MCU.

【0017】

That is, in the relationship between the wireless transmission devices B, C, and G, the receiving unit RCV of the wireless transmission device B includes a receiving amplifier 61, a receiving modulator 62, and a demodulator 63 that receive the signal transmitted from the signal transmission line. Is basically provided (the same applies to the receiver RCV of the wireless transmission devices C and G), and the transmitter TRM of the wireless transmission device B is a demodulator in the receiver RCV of the other wireless transmission devices C and G. A modulator 64 and an output amplifier 65 for wirelessly transmitting the signals obtained in 63 are basically provided (the same applies to the transmitter TRM of the wireless transmission devices C and G).

【0018】

Therefore, when loop-shaped portions are formed in the signal line shown in FIG. 1 described above, the communication data received by the main control unit MCU of the wireless transmission device located in these loop-shaped portions is used. On the other hand, by executing the control program as shown in FIG. 3, for example, it is possible to prevent the communication data in the signal transmission line from forming an infinite transfer loop. That is, FIG. 3 is a flowchart showing an embodiment of a control program in the main control unit MCU of the wireless transmission device for implementing the communication data loop prevention method in the signal transmission line according to the present invention.

【0019】

In this embodiment, in the signal transmission line in the wireless transmission system as shown in FIG. 1 described above, three or more wireless transmission devices connected to the relay section are provided so that data can be transferred in a plurality of directions. Therefore, even if a loop portion is formed on the signal transmission line, communication data is prevented from being transferred indefinitely. Therefore, unique information for recognizing the communication data is added to the communication data transmitted and received between the wireless transmission devices. As a result, when communication data having the same unique information is received again between the wireless transmission devices, the communication data is set to be discarded. With such a configuration, it is possible to prevent the communication data from being transferred indefinitely in the loop portion of the signal transmission line described above.

【0020】

Therefore, in the embodiment shown in FIG. 3, communication data for performing operations such as monitoring and control thereof is transmitted to the wireless transmission device via the signal transmission line, and the receiving unit RCV of the wireless transmission device transmits the communication data. It shows the control program executed when receiving this communication data.

【0021】

First, when the receiving unit RCV of the wireless transmission device receives the required communication data, the main control unit MCU confirms the unique information for recognizing the received communication data, and the same unique information as the previously received data. Confirm and judge whether the data has information added (STEP-1). Therefore, if the data has the same unique information as the previously received data, the received data is discarded (STEP-2) and the process ends.

【0022】

In this case, as the unique information of the communication data, for example, an ID such as a source ID number or a communication data number can be created by formatting the communication data as shown in FIG. 4A.

【0023】

On the other hand, if the data received by the receiving unit RCV is not the data to which the same unique information as the previously received data is added, the main control unit MCU confirms whether or not the data is addressed to its own station. Judge (STEP-3). Therefore, if the data is addressed to its own station, the main control unit MCU performs a predetermined control process based on the communication data (STEP-4), and in order to confirm the unique information of the data from the next time onward, the unique information is described. Store and save the information (STEP-6) and exit.

【0024】

However, if the data is not addressed to its own station, the main control unit MCU performs communication data transfer processing via the transmission unit TRM (STEP-5), and in order to confirm the unique information of the data from the next time onward, the above Memorize and save the unique information (STEP-6), and exit.

【0025】

When storing and saving the unique information, the main control unit MCU formats and creates a history information management table for sequentially storing and saving the ID as the unique information as shown in FIG. 4 (b). can do. In this case, the ring buffer method is adopted in which the IDs stored and stored in the history information management table are deleted from the oldest ones when they are full in the required storage range.

【0026】

According to the communication data loop prevention method of the wireless transmission system according to the above-described embodiment, the communication data having the same unique information is prevented from being transferred in each wireless transmission device, thereby forming a loop in the wireless transmission system. Even if there is a network, it is possible to easily eliminate the repeated transfer of communication data indefinitely.

【0027】

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the spirit of the present invention.

【0028】

[Effect of the invention]

As is clear from the above-described embodiment, according to the communication data loop prevention method of the wireless transmission system according to the present invention, the transfer to the wireless section is performed by the service bit provided in the wireless overhead, and the transfer to the relay section is performed. In a wireless transmission system in which a network is constructed so as to be connected by wire, information unique to the communication data is provided for a signal transmission line that performs data communication for performing operations such as monitoring and control of the wireless transmission device. Is added, and when the communication data to which the same unique information is added is re-received in the wireless transmission device on the signal transmission line, the re-received communication data is set to be discarded. In a wireless transmission system, when three or more wireless transmission devices are provided in the relay section, the signal transmission line performs data communication for monitoring and controlling the wireless transmission device, and the communication data is infinite. It is possible to effectively prevent the formation of a transfer loop.

【0029】

Further, in the wireless transmission device, a step of determining whether or not the received communication data is data to which the same unique information as the previously received data is added, and a step of determining whether or not the received communication data is the same unique information as the previously received data. A step of discarding the received data when the data is added with, and a step of determining whether or not the data is addressed to the own station when the data is not added with the same unique information as the previously received data. A step of performing a predetermined control process based on the communication data when the data is addressed to the own station, a step of performing a communication data transfer process when the data is not addressed to the own station, and the control process and the transfer process. By providing a step of saving the unique information of the received received data, the unique information is added to the communication data, and the communication data to which the unique information once received is added is not received again. The advantage is obtained that the number of data can be reduced and the formation of an infinite transfer loop can be easily prevented.

[Simple explanation of drawings]

[Figure 1]

It is a schematic explanatory drawing which shows the structural example of the loop-shaped part of the signal transmission line in the conventional wireless transmission system.

[Figure 2]

It is a block wiring diagram which shows the schematic structure of the wireless transmission apparatus in FIG.

[Fig. 3]

It is a flowchart which shows an Example of the control program of the wireless transmission apparatus which implements the communication data loop prevention method of the wireless transmission system which concerns on this invention.

[Fig. 4]

(a) is an explanatory diagram showing the format of communication data to which unique information is added, which is applied to the communication data loop prevention method of the wireless transmission system according to the present invention, and (b) is the uniqueness of the communication data received by the wireless transmission device. It is explanatory drawing which shows the format of the history information management table for storing information.

[Fig. 5]

It is a schematic explanatory drawing which shows the configuration example of the conventional wireless transmission system.

[Fig. 6]

FIG. 5 is an explanatory diagram showing a flow of communication data between a plurality of wireless transmission devices interconnected by a wired transmission line provided in a base station in the wireless transmission system shown in FIG.

[Explanation of symbols]

10, 20, 30, 40, 50 base stations 61 Receive amplifier 62 Receiver modulator 63 Demodulator 64 Transmit modulator 65 output amplifier A ~ K wireless transmission device