JP2504481B2 - Data transmission method in telemeter system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention is a data transmission in a telemeter system in which various data sampled by a remote station at a remote place are transmitted to a base station by a relay system between the slave stations using a wireless communication line. Regarding the method, even if a slave station that composes a relay fails, the data of the normal slave station can be transmitted to the base station so that all the data of the slave station can be transmitted to the base station. In a telemeter system that collects information data, a slave station is a slave station that connects transmission power varying means that changes the transmission power of a wireless means that executes radio and a transmission destination slave station that is the destination of information data in a chain. Destination slave station determining means for determining according to the order of remoteness of stations, and response presence / absence detection for detecting presence / absence of response signal from the destination slave station determined by the destination slave station determining means Means for detecting the remoteness between itself and the slave station that has transmitted the information data when it receives the information data, and the slave station that has the transmission right is When the means does not detect the response signal, the slave station of the next order determined by the destination slave station determining means is set as the destination slave station, and the information data reaches the destination slave station thus determined. While controlling the transmission power varying means so that the slave station determined as the destination slave station by the slave station having the transmission right, the slave station whose response signal is issued when the information data is received is transmitted to the slave station having the transmission right. The transmission power varying means is controlled in accordance with the detection result of the remoteness detecting means so that the transmission can be reached.

[Industrial applications]

The present invention relates to a data transmission method in a telemeter system that transmits various data sampled by a remote station to a base station by a relay method between the slave stations using a wireless communication line.

For example, in the case of managing the amount of water stored in a dam, it is necessary to collect various data such as the amount of rainfall and the amount of water at an upstream point in a remote area on a regular basis. There is a telemeter system as one method for collecting data to be sampled at such a remote place. In this telemeter system, wireless equipment is installed at a data sampling point to form a slave station, and various data are wirelessly transmitted to a base station that collects data from the slave station. Information data of remote area 1
It is intended to be collected at various places.

[Conventional technology]

FIG. 8 shows a conventional configuration of this telemeter system. In the figure, 10 is a slave station arranged at a data sampling point, and 20 is a base station for collecting data sampled by the slave station.

As shown in this figure, in order to allow the base station 20 to efficiently collect the data of all the slave stations 10, in the conventional telemeter system, one slave station 10 is provided for each base station 20. While receiving data from the remote station 10 which is a distant point, the data obtained by adding its own data of the received data is transmitted as transmission data to the remote station 10 which is one closer to the base station 20. Data transmission is configured by the so-called bucket relay system.

This relay-type data transmission method has an advantage that the power of required radio equipment can be reduced as compared with the data transmission method in which each slave station 10 directly realizes data transmission to the base station 20. In addition, there is an advantage that the device configuration of the wireless equipment can be simplified because it is only necessary to synchronize the two slave stations 10 for data transmission. It is a transmission method.

[Problems to be solved by the invention]

In such a conventional relay-type data transmission method, the slave station 10 in the next stage is arranged in the service area, which is the radio range of the slave station 10, and in the service area of the slave station 10 in the next stage. A child station that is a child within the service area of the child station 10 that is the parent, such as arranging the child station 10 in the next stage
Since 10 are arranged, if one of the slave stations 10 on the way to the base station 20 is out of order and data cannot be transmitted or received. The base station 20 has a problem that it cannot collect the data of the normal slave station 10 remote from the faulty slave station 10.

The present invention has been made in view of such circumstances,
Although the base station 20 is based on the relay-type data transmission in which the data of all the slave stations 10 can be collected efficiently, even if the slave station 10 constituting the relay fails, the data of the normal slave station 10 is It is an object of the present invention to provide a data transmission method in a telemeter system in which all data can be transmitted to the base station 20.

[Means for solving problems]

 FIG. 1 is an explanatory view of the principle of the present invention.

In the figure, 10 is a slave station, which is arranged in a chain at separate points to collect unique information data at each point, and transmits the collected information data to the base station by wireless communication, Reference numeral 11 is a wireless means included in the slave station 10.
Information data to be collected by the mobile station 10 and for converting radio data sent from another slave station 10 into information data. Reference numeral 12 is a transmission power varying means for changing the transmission power of the radio means 11. 13 is a data transmission control means composed of a reception control means 14 and a transmission control means 15, wherein the reception control means 14 sends from another slave station 10 via the inorganic means 11. The transmission control means 15 is for controlling the reception of the received information data and the response signal, and the transmission control means 15 is for controlling the transmission of the information data and the response signal to be sent to another slave station 10 via the wireless means 11. Reference numeral 16 is a transmission destination slave station determining means for determining the transmission destination slave station 10 to which the information data is to be transmitted according to the order of remoteness from the base station of the slave stations 10 connected in a chain, and 17 is a response Presence / absence detecting means, destination slave station determining means 16 For detecting the presence or absence of the reception of the response signal returned from the transmitting Sakiko station 10 that is more deterministic, 18 is a remote degree detecting means, the other slave stations 10
For detecting the remoteness between the local station and its slave station when the information data from the slave station is received, 19 is an information data detecting means for providing the slave station 10 with the information data, 20
Is a base station, which collects information data of the slave station 10 by wirelessly receiving information data transmitted from the slave station 10.

[Action]

In the present invention, the slave station 10 having the transmission right determines the destination slave station determining means 16 when the response presence / absence detecting means 17 detects that the response signal from the destination slave station 10 does not return. Send the slave station 10 on the base station 20 side of the next rank to the destination slave station 10
Then, the transmission power varying means 12 is controlled so that the information data can reach the new destination slave station 10 thus modified.

On the other hand, the destination slave station 10 that receives the information data from the slave station 10 that has the transmission right detects the remoteness between itself and the slave station 10 that has the transmission right by the remoteness detecting means 18, and detects this. Based on the result, the transmission power varying means 12 is controlled so that the response signal to the slave station 10 having the transmission right can reach the slave station 10 having the transmission right.

As described above, according to the present invention, when the failure of the destination slave station 10 is found because the response signal does not return, the base station 20 side remote station 10 is reset as the destination slave station 10 and By increasing the transmission power of the wireless means 11, the new destination slave station 10 and data transmission can be realized, so that the base station 20 can collect information data of all normal slave stations 10. At the same time, it is possible to identify the slave station 10 in the failure state.

〔Example〕

FIG. 2 shows a system configuration diagram of a slave station of the telemeter system according to the present invention. In this figure, reference numeral 11 denotes a wireless device included in the slave station 10, which is used when the information data collected by the slave station 10 is transmitted to another slave station 10 and is also transmitted and collected by the other slave station 10. Used when receiving information data. Reference numeral 13 is a control unit for controlling data transmitted and received by the wireless device 11. Reference numeral 19 is a detector, and the information data of the slave station 10 detected by the detector 19 is a base station not shown.
Will be collected at 20.

In the present invention, the control unit 13 is configured to control the transmission power of the wireless device 11. A configuration example of this control is shown in FIG. As shown in FIG. 3, the transmission power control signal from the control unit 13 is input to the power amplifier unit 30 that determines the transmission power of the wireless device 11, and the transmission power control signal causes the transmission power of the wireless device 11 to increase. Will be set stepwise or linearly.

Basically, the slave stations 10 configured in this manner are associated with the base stations 20 in a line order, as in the prior art shown in FIG. A slave station that receives information data from the remote station 10 that is one distance away from the station 20 and that is closer to the base station 20 by using the information data that is the received data plus its own information data as transmission data
The information data of all the slave stations 10 are collected in the base station 20 by transmitting the information data to the base station 20.

FIG. 4 shows the frame structure of the wireless data signal of the present invention used to realize the data transmission by the relay system between the slave stations 10. In this figure, 1 is a bit synchronization signal section for indicating the start of information data, 2 is a transmitting station identification number section provided for indicating an address for executing data transmission, and 6 is a relay system. A data signal portion, 9 which represents information data transmitted from the station to the destination slave station 10, and an end code portion 9 which represents the end of the frame.

The transmitting station identification number section 2 includes a local station identification number section 3 representing the address of the local station having the transmission right, a partner station identification number section 4 representing the address of the slave station 10 to which the information data is transmitted, It is composed of an ACK signal section 5 representing a response signal to the source slave station 10 which has transmitted the information data.

Here, the ACK signal section 5 is provided to inform the source slave station 10 when the information data from the source slave station 10 is received. The data signal section 6 is composed of an information data section 7 representing the information data collected by each slave station 10 and an information data identification number section 8 representing the address of the slave station 10 to which the information data belongs. .

Next, the operation of the present invention will be described in detail with reference to the flowcharts of the processes executed by the controller 13 of the slave station 10 shown in FIGS.

The slave station 10 which has the transmission right to transmit the information data of the own station to the base station 20 by the relay system first sends 1 to the base station 20 from the own station as shown in step 10 of FIG. The closest slave station 10 is initialized as the destination slave station 10, and its address is set in the partner station identification number section 4 of the frame of the wireless data signal. Then, in step 11, information data to be transmitted is set in the data signal portion 6 of the frame of the wireless data signal, and the wireless data signal is transmitted to the transmission destination slave station 10. Here, the information data to be transmitted is defined by adding the information data of the slave station 10 having the transmission right to the information data transmitted from the slave station 10 farther from the slave station 10 having the transmission right. Therefore, the base station 20 collects the information data of all the slave stations 10 by such a relay method of stacking the information data.

Subsequently, the slave station 10 having the transmission right, which has completed the transmission of the wireless data signal, determines in step 12 whether the response signal from the transmission destination slave station 10 returns. This response signal is
When the destination slave station 10 receives a wireless data signal addressed to itself, it is transmitted to the slave station 10 having the transmission right, which is the source, so as to notify that effect. Of the wireless data signal to be transmitted to its own destination slave station 10.
It is executed by setting a response signal in the ACK signal section 5. The determination of the presence / absence of the response signal is not limited to the determination based on the presence / absence of a response to one transmission, and it may be determined based on the presence / absence of a response to a plurality of transmissions, for example.

If the response signal is returned in the judgment of step 12, the destination slave station 10 set by the slave station 10 having the transmission right is in the normal state, so the process proceeds to step 13 and the transmission right is transferred to this destination slave. The slave station 10 transferred to the station 10 and having the transmission right until then ends the processing. On the other hand, this step 12
If the response signal is not returned by the judgment of the above, it means that the destination slave station 10 set by the slave station 10 having the transmission right is in a failure state, so the process proceeds to step 14 and one more destination slave station 10 is added. The slave station 10 closer to the base station 20 is set again, and the address of the partner station identification number part 4 of the frame of the wireless data signal is set. Then, the process proceeds to step 15, where the transmission power of the wireless device 11 is increased so that the wireless data signal can reach the new destination slave station 10 set in this way, and the process returns to step 11. Repeat steps 12, 14, and 15 to find the destination slave station 10 in a normal state, send the information data to the destination slave station 10, and connect it with a relay. .

The flowchart shown in FIG. 6 is for a slave station that has a transmission right.
It shows the processing executed by the destination slave station 10 that has received the wireless data signal from 10 to transmit the response signal.

As shown in this figure, in step 20, the slave station 10 which has learned from the partner station identification number section 4 of the received wireless data signal that it is a wireless data signal addressed to itself, proceeds to step 21, and receives this reception. A process of identifying the address of the slave station 10 of the transmission source from the local station identification number section 3 of the wireless data signal is performed. Then, in step 22, the distance between the source slave station 10 and its own station is detected from the address difference between the source slave station 10 and its own station thus obtained. Here, this distance is the source slave station
It is determined by the number of slave stations 10 in a failure state between 10 and the own station.

When the distance between the own station and the source slave station 10 is obtained in step 22, the process proceeds to step 23, and the transmission power of the wireless device 11 is set so that the response signal can reach the source slave station 10. Subsequently, in step 24, the response signal is transmitted to the transmission source slave station 10. Here, this response signal is set by setting the response signal in the ACK signal section 5 of the wireless data signal which this slave station newly having the transmission right transmits to the transmission source slave station 10. However, the present invention is not limited to this, and a wireless data signal including only a response signal may be transmitted independently.

As described above, the slave station 10 executes the processes shown in FIGS. 5 and 6 to identify the slave station 10 in the failure state and skip the slave station 10 in the failure state in the present invention. Then, the relay of data transmission will be connected to the next slave station in the normal state.

There are various possible transmission power varying methods for the wireless device 11 for implementing the present invention, and one example thereof is shown in FIG. In FIG. 7, in FIG. 7A, a switch circuit is provided between the amplifier and the power amplifier of the power amplifier unit 30 of the wireless device 11, and one power amplifier can be selected from a plurality of power amplifiers having different gains. An example of the configuration in which the transmission power is changed in this way is shown.
In the figure (B), by changing the DC power supply voltage supplied to the power amplifier, it is possible to change the gain of the power amplifier and change the transmission power.
FIG. 6C shows a configuration example in which the transmission power is changed by making the gain of the amplifier connected in the preceding stage of the power amplifier variable. The present invention can be realized by any variable method.

〔The invention's effect〕

As described above, according to the data transmission method in the telemeter system of the present invention, if the slave station is in a normal state, the transmission power of the wireless device of the slave station can be reduced, so that the transmission of the information data of the slave station consumes less. It will be possible to use electricity, and therefore, if the slave station is battery operated, it will not be necessary to replace the battery for a long time. On the other hand, if a failure occurs in a part of the slave station, the transmission power of the radio is increased to skip the slave station in the failure state, and the information data can be transmitted only by the slave station in the normal state. Therefore, the base station can collect the information data of all normal state slave stations. Since the base station collects the information data of all the normal station slave stations, if a monitoring unit is provided to check which slave station information data is not present in the base station, a failure occurs. The base station can easily identify the slave station in the state.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the principle of the present invention, FIG. 2 is a system configuration diagram of a slave station of the present invention, FIG. 3 is a configuration diagram for variable transmission power of the present invention, and FIG. 4 is wireless data of the present invention. Fig. 5 is a frame configuration diagram of a signal, Fig. 5 is a flowchart diagram executed by the slave station of the present invention in the transmission mode, Fig. 6 is a flowchart diagram executed by the slave station of the present invention in the reception mode, and Fig. 7 is the present invention. FIG. 8 is a block diagram of an embodiment for varying the transmission power of the above, and FIG. 8 is an explanatory diagram of data transmission of the telemeter system. In FIG. 1, 10 is a slave station, 11 is a wireless means, 12 is a transmission power varying means, 13 is a data transmission control means, 14 is a reception control means, 15 is a transmission control means, 16 is a transmission destination slave station determining means, Reference numeral 17 is a response presence / absence detecting means, 18 is a remote degree detecting means, 19 is an information data detecting means, and 20 is a base station.

Claims (1)

(57) [Claims] 1. A final stage by transmitting information data obtained by a slave station (10) arranged in a chain at a separated point to a slave station (10) at a subsequent stage by stacking the information data by a wireless relay method. In the telemeter system in which the base station (20) connected to the slave station (10) collects the information data of the slave station (10) arranged in a chain, the slave station (10) is a radio that executes radio. The transmission power varying means (12) for changing the transmission power of the means (11) and the destination slave station (10) to which the information data is transmitted are determined according to the order of remoteness of the slave stations (10) connected in a chain. Destination slave station determining means (16), and response presence / absence detecting means (17) for detecting the presence / absence of reception of a response signal from the destination slave station (10) determined by the destination slave station determining means (16). ) And a slave station that has transmitted information data with itself when it received the information data. 10) and a remoteness detecting means (18) for detecting the remoteness, and the slave station (10) having a transmission right has the above-mentioned destination when the response presence / absence detecting means (17) does not detect a response signal. The slave station (10) having the next rank determined by the slave station determining means (16) is set as the transmission destination slave station (10), and the information data reaches the transmission destination slave station (10) thus determined. The slave station (10), which controls the transmission power varying means (12) so that the slave station (10) is determined as the destination slave station (10) by the slave station (10) having the transmission right, receives the information data. The transmission power varying means (12) is controlled in accordance with the detection result of the remoteness detecting means (18) so that the response signal issued to the remote station can reach the slave station (10) having the transmission right. Data transmission method for a telemeter system.