JP2020136887A - Radio network system - Google Patents

Abstract

To provide a radio network system capable of avoiding a situation in which normal communication is disabled by a radio machine number being used by different radio machines.SOLUTION: A radio network system comprises a network of a multi-hop scheme for collecting to a radio master machine 10 data from a plurality of radio slave machines 20 by performing relaying among the radio slave machines 20 using radio waves, the radio master machine 10 identifying and managing the respective radio slave machines 20 in the network using radio machine numbers, the radio master machine 10 assigning a radio machine number to a new radio slave machine 20. Each of the radio slave machines 20 comprises determination means for detecting its radio machine number being used by another radio slave machine and is configured to restart, in the case of detecting its radio machine number being used by another radio slave machine, the radio slave machine 20 itself to reacquire a new radio machine number .SELECTED DRAWING: Figure 6

Description

The present invention relates to a wireless network system.

In the past, data on the amount of gas used was recorded by a meter, and meter readers patrolled the area to collect data from the meter, but in recent years, the data recorded on the meter has been collected via a communication line. Automatic meter reading systems that collect data at the center are becoming widespread.

In realizing such an automatic meter reading system, it would be costly to connect each used meter individually to a communication line by wire, so a wireless slave unit is connected to each meter and each wireless slave is connected. A multi-hop network is used that relays data between machines by radio waves and transmits data like a bucket relay, and this multi-hop network collects data on the wireless master unit while covering a wide communication range. Data is transmitted from a wide area terminal wiredly connected to the wireless master unit to the host computer of the center via a wide area communication line such as PHS (Personal Handy-phone System) or LTE (Long Term Evolution).

In such a multi-hop network, each wireless slave unit in the network is identified and managed by the wireless master unit by the wireless device number, and was originally considered as an automatic meter reading system for apartment houses. Therefore, when constructing a new apartment building, the radio number was manually assigned to each radio slave unit.

Such a highly convenient automatic meter reading system is spreading to general detached houses, but it is difficult to introduce the automatic meter reading system to the detached houses in a specific area all at once, and it is difficult to introduce the automatic meter reading system for each house. Since the time of entry into the network will be different, the wireless master unit will be provided with a number issuing function that automatically assigns the wireless device number to the new wireless slave unit, and the wireless master unit will be used to connect to each wireless slave unit. The radio number is assigned.

The following patent document 1 and the like are available as prior art document information related to this type of automatic meter reading system.

JP-A-2002-218569

However, redundancy of the automatic meter reading system (a measure to avoid system down by operating the other even if one fails by always operating subsystems similar to the inside of the system in parallel) and wireless master unit If there are multiple wireless master units in the same network when exchanging due to the end of their life, the same wireless device number may be issued for different wireless slave units. Such a wireless device number may be issued. There is a concern that communication will not be possible normally if there is duplication of.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wireless network system capable of avoiding a situation in which communication cannot be normally performed due to duplication of wireless device numbers.

The present invention includes a multi-hop network that relays radio waves between a plurality of wireless slave units and aggregates data from each wireless slave unit into a wireless master unit, and wirelessly wirelessly transmits each wireless slave unit in the network. In a wireless network system in which the wireless master unit is identified and managed by the machine number, and the wireless master unit assigns the wireless device number to a new wireless slave unit, each wireless slave unit has a wireless device number. It is characterized by implementing a determination means to detect duplication of radio waves, and when the duplication of radio wave numbers is detected, the radio slave unit itself restarts and reacquires a new radio wave number. It is something to do.

Thus, in this way, when there are multiple wireless master units in the same network, even if the same wireless slave unit is issued for different wireless slave units, each wireless slave unit The determination means implemented in the above detects duplication of its own radio number, and the radio slave unit itself that detects the duplication of radio number restarts to acquire a new radio number again. It is possible to avoid a situation in which communication cannot be performed normally due to duplication of radio numbers.

Further, in concretely implementing the present invention, each wireless slave unit uses a normal hop number table including its own information as a surrounding wireless slave unit by exchanging the hop number table for the first time when a new entry into the network is performed. When the transmission is performed and the response to the transmission includes its own radio number, it is preferable that the determination means is configured to detect the duplication of the radio number.

In addition, each wireless slave unit sends an empty hop count table that does not contain its own information to the surrounding wireless slave units before exchanging the hop count table for the first time when newly entering the network, and responds to it by itself. It may be configured to detect the duplication of the radio number by the determination means when the radio number of the above is included.

Further, each wireless slave unit uses a determination means to determine when the wide area terminal update notification addressed to itself from the wireless master unit cannot be received within a predetermined time after the first exchange of the hop number table performed when a new entry into the network is performed. It may be configured to detect duplicate numbers.

According to the wireless network system of the present invention described above, each wireless slave unit implements a determination means for detecting duplication of wireless device numbers, and when the determination means detects duplication of wireless device numbers, the wireless slave unit itself. Is restarted to acquire a new radio number, so that it is possible to obtain an excellent effect that it is possible to avoid a situation in which communication cannot be performed normally due to duplication of radio numbers.

It is an overall block diagram which applied the 1st Embodiment of this invention to an automatic meter reading system. It is the schematic which shows the structure of the wireless master unit of FIG. It is the schematic which shows the structure of the wireless handset of FIG. It is a block diagram which shows the state before the entry of a new wireless handset. It is a block diagram which shows the state after a new wireless handset has entered. It is a block diagram which shows the state which the radio slave unit of the duplicated radio number has entered. It is a flowchart of the procedure for detecting the duplication of radio numbers in 1st Example. It is a flowchart of the procedure for detecting the duplication of radio numbers in the 2nd Example. It is a flowchart of the procedure for detecting the duplication of radio numbers in the 3rd Example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, exemplifying the case of a wireless network system applied to an automatic meter reading system regarding gas usage, and in this wireless network system, gas usage data is used. The data from each of the wireless slave units 20 is relayed by radio waves between a plurality of wireless slave units 20 connected to the meters 1 and 2 to be recorded (only two are shown in FIG. 1), and the data from each wireless slave unit 20 is transmitted to the wireless master unit 10 (number). A wide area terminal 4 connected to the wireless master unit 10 after the data from each wireless slave unit 20 is aggregated in the wireless master unit 10 by providing a multi-hop system network 3 that aggregates in the issuing gateway connection wireless device). Is sent to the host computer 7 of the center 6 via a wide area communication line 5 such as PHS (Personal Handy-phone System) or LTE (Long Term Evolution).

In such a wireless network system, each wireless slave unit 20 in the network 3 is identified and managed by the wireless master unit 10 by a wireless device number, and a new wireless slave unit 20 is managed by the wireless master unit 10. For example, in the five wireless slave units 20 shown in FIG. 1, a unique wireless device number 00 to 04 is assigned by the wireless master unit 10 to each of the five wireless slave units 20 shown in FIG. The wireless slave unit 20 periodically transmits a short frame including its own wireless device number, and then repeats intermittent transmission of returning to the original state through a reception waiting state for confirming whether or not there is a transmission request addressed to itself. It has become like. The radio number of the radio master unit 10 itself in FIG. 1 is FD.

The configuration of the wireless master unit 10 is as shown in FIG. 2, and the communication unit 11 that transmits / receives data by wireless communication with each wireless slave unit 20 and each wireless slave unit 20 are identified and managed by the wireless device number. The control unit 12, the operation unit 13 for manually operating the initial settings of the wireless master unit 10, the exchange unit 14 for exchanging the hop number table to be described in detail later with the surrounding wireless slave units 20, and each wireless slave unit. Obtained based on the responses from the notification unit 15 for notifying the necessary information to the 20 and the issuing unit 16 for issuing the radio number of the wireless slave unit 20 newly entered in the network 3, and each wireless slave unit 20. It includes a storage unit 17 for storing information.

The configuration of the wireless slave unit 20 is as shown in FIG. 3, and the communication unit 21 that transmits / receives data by wireless communication with each wireless slave unit 20 or the wireless master unit 10 and the received wireless communication are addressed to themselves. An operation for manually operating the control unit 22 that determines whether or not it is addressed to the wireless master unit 10 and performs relay transfer, the response unit 23 that instructs the response to the received wireless communication, and the initial setting of the wireless slave unit 20. Around the unit 24, the acquisition unit 25 that performs number issuance request communication with the surrounding wireless slave unit 20 or the wireless master unit 10 in order to acquire the wireless device number at the time of activation, and the hop number table exchange described in detail later. Information obtained based on the response from each wireless slave unit 20, the switching unit 26 performed with the wireless slave unit 20 or the wireless master unit 10, the determination unit 27 for determining whether or not the wireless device numbers are duplicated, which will be described in detail later. It is provided with a storage unit 28 for storing the above.

Then, each wireless slave unit 20 can be assigned a wireless device number from the wireless master unit 10 at the time of new entry into the network 3, and more specifically, the wireless slave unit 20 in the hibernation state operates. When activated by the activation instruction from the unit 24, the number issuance request communication for acquiring the radio unit number by the instruction of the acquisition unit 25 is performed to the surrounding wireless slave unit 20 or the wireless master unit 10. ing.

Further, the wireless master unit 10 that receives the number issuance request communication by relay transfer of the wireless slave unit 20 (wireless slave unit 20 that is not the source) or direct communication from the wireless slave unit 20 that is the source is instructed by the issuing unit 16. A new radio number is issued to perform number issuance response communication, and the issuing radio slave unit 20 that receives this number issuance response communication uses the issued radio number as its own radio number. In order to determine the communication path in the network 3 with the surrounding wireless slave unit 20 or wireless master unit 10, communication called hop number table exchange is performed according to the instruction of the exchange unit 26.

The hop number table exchange is a hop number table that stores the minimum number of hops (hops) that can be reached from oneself to another wireless slave 20 via the wireless slave number in association with the wireless number. Refers to mutual communication in which the number of hops returned from the surrounding wireless slave units 20 is received as a response while transmitting to the wireless slave unit 20 of the network 3, and the number of wireless slave units 20 in the network 3 increases or decreases. When the route that can be directly communicated changes, the contents of the hop number table are edited and exchanged with each other to respond to the change in the network 3, and the hop number table is exchanged at regular intervals. The hop number table that has been repeatedly executed and exchanged is stored in the storage unit 28 of each radio slave unit 20.

Unique IDs are assigned to the wireless slave unit 20 and the meters 1 and 2 connected to the wireless slave unit 20 by wire, and these IDs are also linked to the wireless device number by the wireless master unit 10. Although it is managed, the wireless master unit 10 that detects the entry of a new wireless slave unit 20 into the network 3 by the first hop number table exchange is the ID of the wide area terminal 4 connected to itself by wire. Is made known to the new wireless slave unit 20, and a wide area terminal update notification for acquiring the ID of the wireless slave unit 20 and its meters 1 and 2 is provided.

Here, a case where a wireless slave unit 20 (radio unit number 04) that cannot directly communicate with the wireless master unit 10 among the wireless slave units 20 in the network 3 newly enters will be described as an example. FIG. 4 shows a new wireless slave unit. As shown in the state before the entry of the machine 20, when the devices connected by the arrows in FIG. 4 can directly communicate with each other, the hops of the radio slave units 20 of the radio numbers 00 to 03 in the network 3 of FIG. The number table is as shown in Table 1 below.

As shown in FIG. 5, when a new wireless slave unit 20 (radio number 04) enters the network 3, the newly entered wireless slave unit 20 (radio number 04) is in a position where direct communication is possible. The hop number table will be exchanged with the two wireless slaves 20 (radio number 01) and the wireless slave 20 (radio number 02). First, the wireless slave 20 (radio number 04) and the wireless slave Assuming that the machine 20 (radio number 01) exchanges the hop number table, the contents of the hop number table of the wireless slave unit 20 (radio number 04) in the initial state are as shown in the upper part of Table 2 below. Since the hop number table has not been exchanged with another wireless slave unit 20, only the own radio number 04 and the number of hops (the number of own hops is 0) are registered in the hop number table. On the other hand, the contents of the hop number table of the wireless slave unit 20 (radio number 01) are as shown in the lower part of Table 2 below.

Then, when the wireless slave unit 20 (wireless device number 04) and the wireless slave unit 20 (radio device number 01) exchange the hop number table, the wireless slave unit 20 (wireless) 20 (wireless) is shown in the upper and lower rows of Table 3 below. The wireless slave unit 20 (radio number 01) was registered in the hop number table of the machine number 04) with the number of hops 1, and was also registered in the hop number table of the wireless slave unit 20 (radio number 01). The radio numbers 00, 02, 03 of the wireless slave unit 20 and the wireless device number FD of the wireless master unit 10 are registered with the number of hops + 1, and the wireless slave unit 20 (radio number 01) is registered in the hop number table. The slave unit 20 (radio number 04) is registered with one hop number.

Next, when the wireless slave unit 20 (radio number 04) and the wireless slave unit 20 (radio number 02) exchange the hop number table, the wireless slave unit 20 (radio number 04) and the wireless slave unit 20 (radio slave unit 20) The contents of the hop number table of radio number 02) are as shown in the upper and lower rows of Table 4 below, and the radio slave unit 20 (radio number 04) and the radio slave unit 20 (radio number 02) are shown. ) Exchange the hop number table, and as shown in the upper and lower rows of Table 5 below, the hop number of the wireless slave unit 20 (radio number 02) is displayed in the hop number table of the wireless slave unit 20 (radio number 04). Is updated to 1 and registered, and the number of hops of the other wireless slave unit 20 (radio number 00, 01, 03) and the wireless master unit 10 (radio number FD) is increased to the wireless slave unit 20 (radio). The number of hops (number 02) is updated to a smaller value than the number of hops registered in the hop number table (+1) and registered (in this example, no update occurs), and the radio slave unit 20 (radio number) In the hop number table of 02), the radio slave unit 20 (radio number 04) is registered as the hop number 1.

After that, the wireless slave unit 20 (radio number 01) and (radio number 02) whose hop number table was updated inform the surrounding wireless slave unit 20 and the wireless master unit 10 that the hop number table was updated. By exchanging the hop number table and repeating the same process as described above, the hop number tables of all the wireless slave units 20 and the wireless master unit 10 in the network 3 are finally shown in Table 6 below. Will be updated as

At this time, in the example of FIG. 5, only one wireless master unit 10 exists in the network 3, but in the case of making the automatic meter reading system redundant or replacing the wireless master unit 10 due to its life, etc. As described above, when a plurality of wireless master units 10 exist in the same network 3, the same wireless device number may be issued for different wireless slave units 20.

Therefore, in the present embodiment, the determination means for detecting the duplication of radio numbers is implemented as the determination unit 27 in each of the radio handsets 20, and when the duplication of radio numbers is detected, the radio handsets 20 It is configured to restart itself and acquire a new radio number, and more specifically, it usually includes its own information in the first exchange of the hop number table performed when a new entry into network 3 is performed. The number of hops table is transmitted to the surrounding radio slave units 20, and when the response to the table includes its own radio number, the determination unit 27 (see FIG. 3) detects duplication of radio numbers. I am doing it.

For example, as shown in FIG. 6, the radio slave unit 20 (indicated by the radio number 03 in FIG. 6) newly entering the network 3 is assigned the same radio number 03 as another wireless slave unit 20. In this case, assuming that the wireless slave unit 20 (radio number 03 ) and the wireless slave unit 20 (radio number 01), which are in a communicable position, perform the first hop number table exchange, the wireless slave unit 20 in the initial state The contents of the hop number table of (radio number 03 ) are as shown in the upper part of Table 7 below, and the contents of the hop number table of wireless slave unit 20 (radio number 01) are shown in Table 7 below. It is as shown in the lower row.

When the wireless slave unit 20 (radio number 03 ) and the wireless slave unit 20 (radio number 01) exchange the hop number table for the first time, is the radio slave number included in the hop number table? Something is searched by the determination unit 27 (see FIG. 3) of the wireless slave unit 20 (radio number 03 ), and the own wireless device number 03 is found in the hop number table from the wireless slave unit 20 (radio number 01). If it is confirmed that it is included, it is determined that the radio number is duplicated, so the radio slave unit 20 (radio number 03 ) itself restarts and reacquires a new radio number. After a new non-duplicate radio number 04 is issued, the duplication of radio numbers will be eliminated by exchanging the hop number table again.

FIG. 7 is a flowchart showing a series of steps for the radio slave unit 20 newly entering the network 3 to confirm whether or not its own radio number is duplicated in the first hop number table exchange. After the number issuance request communication for acquiring the radio equipment number is performed in S1, it is confirmed in step S2 whether or not the radio equipment number has been acquired, and the number issuance request in step S1 is performed until the radio equipment number is acquired. While the communication is repeated, when the acquisition of the radio number is confirmed, the process proceeds to step S3 and the initial flag is turned on.

Next, the hop number table is exchanged in step S4, it is confirmed in the next step S5 whether or not the initial flag is on, and when the onness of the initial flag is confirmed, the process proceeds to step S6 to turn off the initial flag. Then, the process proceeds to step S7, and it is confirmed whether or not the received exchange partner's hop number table includes its own radio number.

Then, in step S7 above, if the received exchange partner's hop number table includes its own radio number, it is determined that the radio numbers are duplicated, so the process is returned to step S1. The number issuance request communication for reacquiring a new radio number will be executed again, but if the received exchange partner's hop number table does not include its own radio number, the radio number Since it is determined that no duplication has occurred, it is confirmed in step S9 whether or not the hop number table has been updated after the process proceeds to step S8 and the hop number table is edited.

Here, in the first hop number table exchange performed immediately after the acquisition of the radio number, since the hop number table is updated due to the new entry of the player, it is determined in step S10 that the hop number table is updated. The update is returned to step S4 to notify the surrounding wireless slave unit 20 or wireless master unit 10, and the hop number table exchange is performed again. However, in the flow from the second and subsequent hop number table exchanges, Since the initial flag has already been turned off, the process proceeds from step S5 to step S6 and step S7 to edit the hop number table in step S8, and it is confirmed in step S9 that the own hop number table has not been updated. After that, the process of receiving various update notifications in step S10 is performed, and then the process ends.

Further, as a second embodiment, an empty hop number table that does not include its own information is transmitted to the surrounding wireless slave units 20 before the first exchange of the hop number table performed at the time of new entry into the network, and the response to the empty hop number table is transmitted. Each wireless slave unit 20 may be configured so that the determination unit 27 (see FIG. 3) detects duplication of wireless device numbers when its own wireless device number is included.

For example, as shown in FIG. 6 used in the above description, the wireless slave unit 20 (indicated by the wireless device number 03 in FIG. 6) newly entering the network 3 has the same wireless device number as another wireless slave unit 20. When 03 is assigned, in this second embodiment, the radio slave unit 20 (radio device number) in a position where it can communicate with an empty hop number table that does not include its own information before the first exchange of the hop number table. When transmitting to 02), the radio slave unit 20 (radio number 02) responds with a hop number table as shown in Table 8 below, and its own radio number 03 is included in the hop number table. Whether or not it is present is searched by the determination unit 27 (see FIG. 3) of the wireless slave unit 20 (radio device number 03 ).

As a result, if it is confirmed that the own radio number 03 is included in the hop number table from the radio slave unit 20 (radio number 02), it is determined that the radio number is duplicated. Since the judgment is made in 27 (see FIG. 3), the radio slave unit 20 (radio number 03 ) itself restarts to acquire a new radio number, and a new non-duplicate radio number 04 is issued. After that, the duplication of radio numbers will be eliminated by exchanging the hop number table for the first time.

FIG. 8 is a flowchart showing a series of steps for the radio slave unit 20 newly entering the network 3 to confirm whether or not its own radio number is duplicated before the first hop number table exchange. After the number issuance request communication for acquiring the radio equipment number is performed in step S11, it is confirmed in step S12 whether or not the radio equipment number has been acquired, and the number issuance in step S11 until the radio equipment number is acquired. While the request communication is repeated, when the acquisition of the radio number is confirmed, the process proceeds to step S13, and an empty hop number table that does not include its own information is transmitted to the radio handset 20 at a communicable position.

Then, in the next step S14, it is confirmed whether or not the own radio number is included in the hop number table responded to the transmission of the empty hop number table, and the own radio number is included. If this is the case, it is determined that the radio equipment numbers are duplicated, so that the process returns to step S11 and the number issuance request communication for reacquiring a new radio equipment number is performed again.

At this time, if the own radio number is not included in the previous step S14, it is determined that the radio numbers are not duplicated. Therefore, the process proceeds to the next step S15 to exchange the hop number table for the first time. After that, the hop number table is edited in step S16, and then it is confirmed in step S17 whether or not the hop number table has been updated.

Here, in the first hop number table exchange performed immediately after the acquisition of the radio number, the hop number table is updated due to the new entry of the player, so that it is determined in step S18 that the hop number table is updated. The update is returned to step S15 to notify the surrounding wireless slave unit 20 or wireless master unit 10, and the hop number table exchange is performed again. However, the hop number table exchange after the second time causes itself in step S18. When the update of the hop number table of the above is completed, the process proceeds to step S18, and the process of receiving various update notifications is performed and then the process ends.

Further, as a third embodiment, when the wide area terminal update notification addressed to itself from the wireless master unit 10 cannot be received within a predetermined time after the first exchange of the hop number table performed at the time of new entry into the network, the determination unit 27 Each wireless slave unit 20 may be configured to detect duplication of wireless device numbers according to (see FIG. 3).

That is, the wireless master unit 10 that detects the entry of the new wireless slave unit 20 into the network 3 by exchanging the hop number table for the first time has a new ID of the wide area terminal 4 (see FIG. 1) connected to itself by wire. A wide area terminal update notification is provided for disseminating information to the wireless slave unit 20 and acquiring the IDs of the wireless slave unit 20 and its meters 1 and 2 (see FIG. 1).

At this time, if the wide area terminal update notification addressed to itself from the wireless master unit 10 cannot be received within a predetermined time after the first exchange of the hop number table, another wireless slave unit 20 having the same wireless device number as itself is sent. Since it is presumed that the wide area terminal update notification has been notified, in this third embodiment, the wide area terminal update notification addressed to itself from the wireless master unit 10 after the first exchange of the hop number table is within a predetermined time. If the radio cannot be received, the determination unit 27 (see FIG. 3) determines that the radio number of the radio slave unit is duplicated, and the radio slave unit 20 (radio device number 03 ) itself restarts to make a new one. After reacquiring the radio number and issuing a new non-duplicate radio number 04, the duplication of the radio number will be eliminated by performing the first hop number table exchange again.

FIG. 9 is a flowchart showing a series of steps for the radio slave unit 20 newly entering the network 3 to confirm whether or not its own radio number is duplicated after the first hop number table exchange. After the number issuance request communication for acquiring the radio equipment number is performed in S21, it is confirmed in step S22 whether or not the radio equipment number has been acquired, and the number issuance request in step S21 is performed until the radio equipment number is acquired. Communication is repeated.

After that, when the acquisition of the radio number is confirmed, the process proceeds to step S23 to perform the first hop number table exchange, the hop number table is edited in the next step S24, and then the hop number table is updated in step S25. It is confirmed whether there was.

Here, in the first hop number table exchange performed immediately after the acquisition of the radio number, the hop number table is updated due to the new entry of the player, so that it is determined in step S25 that the hop number table is updated. The process is returned to step S23 in order to notify the surrounding wireless slave unit 20 or wireless master unit 10 of the update, and the hop number table exchange is performed again.

Then, when the update of the own hop number table is stopped in step S25 by exchanging the hop number table from the second time onward, the timer (which may be incorporated in hardware or implemented by software) starts timing in the next step S26. Then, in the next step S27, the reception processing of various update notifications is performed in parallel behind the timekeeping, while in step S28 it is confirmed whether or not the wide area terminal update notification has been received.

At this time, if the reception of the wide area terminal update notification is confirmed in the previous step S28, it is determined that the radio numbers are not duplicated. Therefore, in the next step S29, the timer timing is stopped and then the process ends. However, if the reception of the wide area terminal update notification is not confirmed in the previous step S28, the predetermined time has elapsed in which the wide area terminal update notification will be delivered from the wireless master unit 10 after the first hop number table exchange in step S30. Whether or not (whether or not it has timed out) is confirmed, and before this predetermined time has elapsed, it is returned to step S27 and is in a state of waiting for the reception of the update notification, and if the update notification is received, it is processed at any time. It becomes.

However, if it is confirmed in the previous step S30 that the predetermined time has elapsed, it is determined that the radio number has been duplicated and the wide area terminal update notification has been notified to another radio slave unit 20. Therefore, the process is returned to step S21, and the number issuance request communication for reacquiring a new radio number is executed again.

The wireless network system of the present invention is not limited to the above-described embodiment, is not limited to application to an automatic meter reading system regarding the amount of gas used, and is within the range not deviating from the gist of the present invention. Of course, various changes can be made in.

3 Network 10 Wireless master unit 20 Wireless slave unit 27 Judgment unit (judgment means)

Claims (4)

A multi-hop network is provided that relays data between a plurality of wireless slave units by radio waves and aggregates data from each wireless slave unit into a wireless master unit, and the wireless slave units in the network are referred to by the wireless device number. In a wireless network system in which a wireless master unit identifies and manages the wireless master unit and assigns a wireless device number to a new wireless slave unit by the wireless master unit, each wireless slave unit detects duplication of a wireless device number. A wireless network system characterized in that the wireless slave unit itself is restarted and a new wireless device number is acquired again when a duplicated wireless device number is detected. .. Each radio slave unit sends a normal hop count table containing its own information to the surrounding radio slave units in the first exchange of the hop count table when a new entry into the network is performed, and the radio slave number of the radio slave unit responds to it. The wireless network system according to claim 1, wherein the wireless network system is configured to detect duplication of wireless device numbers by a determination means when the above is included. Each wireless slave unit sends an empty hop count table that does not contain its own information to the surrounding wireless slave units before the first exchange of the hop count table when entering the network, and responds to it by its own radio. The wireless network system according to claim 1, wherein the wireless network system is configured to detect duplication of wireless device numbers by a determination means when a machine number is included. When each wireless slave unit cannot receive the wide area terminal update notification addressed to itself from the wireless master unit within a predetermined time after exchanging the hop number table for the first time when newly entering the network, the wireless slave unit is determined by the determination means. The wireless network system according to claim 1, wherein the wireless network system is configured to detect duplication.

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