JP2017195490A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system which can appropriately perform information communication between a master radio unit and a plurality of slave radio units.SOLUTION: In the radio communication system, a master radio unit R00 which becomes a start point successively transmits forward message data to each slave radio unit, as a radio unit in which each slave radio unit becomes an end point. Also, the slave radio unit, which becomes the end point of forward message data reception from the master radio unit R00, is operated next, as a radio unit which becomes the start point, transmits return message data to the master radio unit R00, as a radio unit in which the master radio unit R00 becomes the end point. When there is a slave radio unit which does not receive the return message data after transmitting forward message data, the master radio unit R00 performs retrial processing to transmit forward message data again to the slave radio unit, on condition that a lapse period from the transmission of the forward message data to the slave radio unit exceeds a predetermined restriction period.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless communication system including a plurality of wireless devices including one parent wireless device and a plurality of child wireless devices fixedly installed in a facility.

  Patent Document 1 proposes a wireless meter reading system for the purpose of efficiently performing meter readings such as a gas meter, an electric meter, and a water meter installed in each house of an apartment house. In this wireless meter reading system, first, a meter reading value collection command is transmitted from a master wireless device (gateway terminal) as a starting point. Even if this meter reading value collection command is directed to a slave radio at a position where the signal does not reach directly from the master radio, information via other slave radios at a position where the signal can reach directly By performing the communication over a plurality of stages, the forward credit data including the meter reading value collection command is transmitted to the slave wireless device that is the end point. In addition, reply data including the meter reading value is transmitted from the child radio device to the parent radio device.

Japanese Patent No. 5595157

  In the system described in Patent Document 1, a trouble that a trusted data packet including a meter-reading value collection command transmitted from a parent wireless device serving as a starting point is not received by a child wireless device serving as an end point, or a child wireless device serving as an end point There is a possibility that troubles such as that the return data including the meter reading value returned to the parent radio device are not received by the parent radio device may occur. In that case, there arises a problem that the master wireless device cannot complete the collection of meter reading values by all meters.

  Even if the master radio device has not yet received a reply data packet from each slave radio device, the outgoing data packet or the reply data packet is still being transferred between the radio devices. In some cases. In such a case, just because the parent radio device has not yet received a reply data packet from a specific child radio device, it retransmits a data packet of trust that includes a meter reading value collection command for that particular child radio device. If (retry) is performed, there arises a problem that two data packets relating to the collection of meter readings of the same meter coexist between the radio units.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a wireless communication system capable of appropriately performing information communication between a parent wireless device and a plurality of child wireless devices. It is in.

The characteristic configuration of the wireless communication system according to the present invention for achieving the above object includes a plurality of wireless devices including one parent wireless device and a plurality of child wireless devices fixedly installed in a facility, One-step information communication is performed to the radio device that is the end point at a position where the signal directly reaches from the radio device that is the start point, or the signal is not directly reached from the radio device that is the start point Information communication from the wireless device that is the starting point to the wireless device that is the ending point by performing multiple stages of information communication via the wireless devices that are in positions where signals can directly reach the wireless device that is the ending point A wireless communication system in which
The master wireless device as a starting point sequentially transmits data of outgoing credits toward the child wireless devices as a plurality of end points, with each of the plurality of child wireless devices as the wireless device as an end point, and The child radio device that is the end point that has received the outbound trust data from the parent radio device then operates as the radio device that is the starting point, and the parent radio device is the parent device that is the end point. Send reply data to the radio,
The parent wireless device that is the starting point transmits information on the forward trust data including information indicating a validity period of the forward trust data, and the slave wireless device that is the end point by the parent wireless device is: When operating as the wireless device that is the starting point of itself, send the reply data including information indicating the validity period of the reply data,
The radio is configured not to process the data when the validity period of the received data has expired;
When there is the child radio device that is a specific end point that has not yet received the reply data after transmitting the outgoing data, the parent radio device has the child radio device that is the specific end point. The elapsed period from the transmission of the outbound credit data to the destination has exceeded a predetermined limit period longer than the sum of the effective period of the outbound credit data and the effective period of the reply data. As a condition, a retry process is performed in which the outgoing credit data is transmitted again toward the child radio device serving as the specific end point.

  According to the above characteristic configuration, even if there is a slave radio that has not yet received reply data, the master radio can perform a retry process and request a reply, and the retry process is an end point. Elapsed period after sending the forward credit data to the child radio exceeded the specified limit period longer than the sum of the forward credit data valid period and the reply data valid period Therefore, a plurality of data packets relating to meter reading value collection do not coexist between the wireless devices. Therefore, it is possible to provide a wireless communication system capable of appropriately performing information communication between the parent wireless device and the plurality of child wireless devices.

  Another characteristic configuration of the wireless communication system according to the present invention is that, when the parent wireless device performs the retry process, the validity period of the outbound credit data is greater than the valid period of the outbound credit data previously transmitted. There is also a point in setting a long period.

  According to the above characteristic configuration, since the effective period is long in the retry process, even if it takes a long time to transmit / receive information between the wireless devices, the parent wireless device serving as the starting point changes to the child wireless devices serving as the ending point. There is a high possibility that the data of outgoing credit will arrive.

Still another characteristic configuration of the wireless communication system according to the present invention is that each of the plurality of wireless devices includes the other wireless device in a position where a signal having a strength of a predetermined value or more directly reaches from the one wireless device. Information about the number of relay stages to the other wireless device based on the wireless device, the number of relay steps from the one wireless device determined in a format that is regarded as the first wireless device, and itself Relay stage number information including information on the number of relay stages to the other radio set based on the first radio set as the relay stage number from the radio set, and the data is the end point It operates by switching between a communication mode that is an operation mode when transmitting toward the wireless device, and a beacon emission mode in which a temporary active state that emits a beacon and other inactive states are alternately repeated,
When information communication is performed between the wireless device on the information transmitting side and the wireless device on the information receiving side,
When the radio on the information transmitting side shifts to the operation in the communication mode, the radio on the information receiving side enters a beacon waiting state for receiving a beacon emitted by the radio on the information receiving side operating in the beacon emission mode. And when receiving the beacon emitted by the wireless device on the information receiving side when the beacon is waiting, if the wireless device on the information receiving side satisfies a predetermined communication partner condition, Send inquiry information about whether or not you are involved in information communication to the radio,
When the wireless device on the information receiving side receives the inquiry information, if the predetermined communication participation condition is satisfied, the wireless device on the information transmitting side sends a reply indicating that it is involved in information communication to the wireless device serving as the end point. Perform to the radio, and if the predetermined communication participation condition is not satisfied, send a reply to the radio on the information transmission side to the radio that does not participate in information communication to the radio that is the end point,
When the wireless device on the information transmitting side receives a reply from the wireless device on the information receiving side that it is involved in information communication to the wireless device that is the end point, the wireless device that is to be transmitted to the wireless device that is the end point Data is transmitted to the radio on the information receiving side.

  According to the characteristic configuration described above, the information transmission-side radio can select a radio that satisfies a predetermined communication partner condition and attempt to transmit information. If the condition is satisfied, it is possible to participate in information communication with the end-point radio device. That is, since both the information transmitting side radio device and the information receiving side radio device can select the other party, reliable communication can be performed.

Still another characteristic configuration of the wireless communication system according to the present invention is that the predetermined communication partner condition is:
The beacon received within the first reception waiting period after being in the beacon waiting state is radiated by the radio on the information receiving side that satisfies the first condition;
A beacon received within a second reception waiting period after the first reception waiting period is emitted by the radio on the information receiving side that satisfies the first condition and the second condition;
The beacon received after the second reception waiting period is emitted by the radio on the information receiving side that satisfies the first condition, the second condition, and the third condition,
The first condition is that the number of relay stages from the radio on the information receiving side to the radio that is the end point is less than the number of relay stages from the radio on the information transmitting side to the radio that is the end point, And, the number of relay stages from the radio on the information transmission side to the radio on the information reception side is one stage,
In the second condition, the number of relay stages from the radio on the information receiving side to the end-point radio is the same as the number of relay stages from the radio on the information transmitting side to the end-point radio. That is,
The third condition is that all the wireless devices are used.

  According to the above-described feature configuration, a partner that can transmit information with a relatively strong signal is preferentially selected, and a communication path that is closer (that is, arrives faster) to the end-point radio is preferentially selected. Is done.

  Still another characteristic configuration of the radio communication system according to the present invention is that the predetermined communication participation condition is that the number of relay stages from the radio on the information transmitting side to the radio on the information receiving side is one. Alternatively, when the number of relay stages from the radio on the information transmitting side to the radio on the information receiving side is two or more, the radio that is the end point from the radio on the information receiving side itself The number of relay stages to the machine is less than or equal to the number of relay stages from the radio apparatus on the information transmission side to the radio apparatus that is the end point.

  According to the characteristic configuration described above, communication can be performed between the wireless devices while balancing the reliability of information communication and the speed of information transmission.

  Yet another characteristic configuration of the wireless communication system according to the present invention is that when the data is transmitted to the wireless device serving as the specific end point by the retry processing, the number of relay stages from one wireless device is Direct information communication with another wireless device at the second stage or higher is prohibited.

When the number of relay stages between two wireless devices is two or more, the signal is relatively weaker than when the number of relay stages is one.
However, in this feature configuration, when retry processing is performed, direct information communication from one wireless device to another wireless device having the second or higher number of relay stages is prohibited, so that the signal strength is relatively strong. Communication is performed while selecting.

It is a figure which shows the structure of a radio | wireless communications system. It is a figure which shows relay stage number information. It is a figure which shows the communication processing performed between each radio | wireless machine. It is a figure which shows the communication processing performed between each radio | wireless machine.

A radio communication system according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration of a wireless communication system. As shown in the figure, the wireless communication system includes a plurality of wireless devices including one parent wireless device R00 (R) and a plurality of child wireless devices R00 to R07 that are fixedly installed in a facility 1 such as an apartment house. R is provided. Each dwelling unit L (L00-L07) of the facility 1 is provided with a meter M (M00-M07) such as a gas meter, an electric meter, and a water meter, and the wireless devices R (R00-R07) M00 to M07). The master radio device R00 is configured to collect meter reading values such as gas, electricity, and water from each meter M.

  In this wireless communication system, one-step information communication is performed from the wireless device R that is the starting point to the wireless device R that is the end point where the signal is directly reached, or a signal is transmitted from the wireless device R that is the starting point. The information communication via the wireless devices R at positions where signals can reach directly is performed over a plurality of stages to the wireless device R which is at the position where the signal does not reach directly, so that the wireless device which is the end point from the wireless device R as the starting point. Information communication to the machine R is performed.

FIG. 2 is a diagram showing the relay stage number information.
Each of the plurality of radio devices R has another radio device R in a position where a signal with a strength of a predetermined value or more directly reaches from one radio device R, and the number of relay stages from the one radio device R is the first stage. Information about the number of relay stages to another radio R based on its own radio R determined in a format considered as radio R, and the radio with the first stage from the own radio R It stores relay stage number information including information on the number of relay stages to another radio device R based on R.

Referring to FIG. 2, in the information about the number of relay stages from the radio device R00, that is, the number of relay stages to the other radio device R based on the radio device R00, the number of relay stages to the radio device R00 is 0. The number of relay stages to the radio R01 is set to one, the number of relay stages to the radio R02 is set to one, the number of relay stages to the radio R03 is set to two, and the radio to the radio R04 is set. The number of relay stages is set to one, the number of relay stages to radio R05 is set to one, the number of relay stages to radio R06 is set to one, and the number of relay stages to radio R07 is set to two. Has been.
Similarly, information on the number of relay stages to other wireless devices R based on the wireless devices R01 to R07 is also set.

  Then, each radio device R uses information about the number of relay stages to another radio device R with reference to its own radio device R, and the radio device R with the first relay stage number from its own radio device R as a reference. The relay stage number information including the information about the relay stage number to the other wireless device R is stored. For example, in the case of the radio device R00, the stage number table for the number of relay stages to the other radio device R based on itself and the radio devices R01, R02, R04, R05, R06 having the first relay stage number from itself Relay stage number information including a stage number table for the number of relay stages to another wireless device R as a reference is stored. Such relay stage number information can be created by transmitting and receiving a signal of a predetermined strength between the wireless devices R when the wireless device R is installed in the facility 1.

[Batch reading]
FIG. 3 is a diagram illustrating communication processing performed between the wireless devices R. The master wireless device R00 receives a meter reading instruction transmitted by the meter reading operator who has arrived at the facility 1 using a handheld terminal or the like, or from the computer device of the meter reading operator connected via the Internet or the like. When a meter-reading instruction is accepted, each slave radio R is requested to transmit a meter-reading value. FIG. 3 shows that the master radio device R00 is the start point of information communication and the slave radio device R07 is the end point of information communication, that is, the meter reading value of the meter M07 connected to the slave radio device R07 is requested. This is an example of the case.

  Each radio device R alternately repeats a communication mode that is an operation mode when data is transmitted toward the radio device R that is the end point, a temporary active state that emits a beacon, and other inactive states. It operates by switching the beacon emission mode. In the example shown in FIG. 3, first, the parent radio device R00 is in the communication mode, and the other child radio devices R are in the beacon emission mode.

  The child radio device R01 is in an active state in the beacon emission mode, and the other child radio devices R02 to R07 are in an inactive state. When the slave radio device R01 transmits a beacon (information A) in step # 10 of FIG. 3, the beacon is received by the master radio device R00. Information A includes information such as a sequence number, a destination (broadcast), a network number, and a transmission source radio number. Here, the sequence number is a value incremented for each transmission / reception, and the network number is a number for associating the parent radio device and the child radio device. The transmission source radio number is a number unique to its own radio R (child radio R01).

In the present embodiment, when the radio device R on the information transmission side shifts to the operation in the communication mode, the beacon waiting state for receiving the beacon emitted by the radio device R on the information reception side operating in the beacon emission mode When the beacon emitted by the information receiving side radio device R is received when the information receiving side radio device R is in the beacon waiting state, if the information receiving side radio device R satisfies a predetermined communication partner condition, Inquiry information on whether to participate in information communication to the machine R is transmitted.
The communication partner conditions are the conditions shown in Tables 1 and 2 below.

  As shown in Table 1 and Table 2, in the example of FIG. 3, when the parent radio device R00 shifts to the beacon wait state in the communication mode, the radio device R satisfying the first condition is satisfied in the first reception wait period. Wait for beacons only. When the parent radio device R00 cannot receive the beacon from the radio device R during the first reception waiting period, the parent radio device R00 sets either the first condition or the second condition during the next second reception waiting period. Wait for a beacon from radio R to fill. Furthermore, if the parent radio device R00 cannot receive the beacon from the radio device R as described above within the second reception waiting period, the radio device satisfying any of the first condition, the second condition, and the third condition. Wait for the beacon from machine R.

  In this example, the number of relay stages for the child radio device R07 as the end point (destination) is two steps from the parent radio device R00 and three steps from the child radio device R01. That is, the child radio device R01 is farther than the parent radio device R00 with respect to the child radio device R07 that is the destination (end point) (the number of relay stages is large). Accordingly, since the first condition is not satisfied, the parent radio device R00 does not respond at all even if it receives a beacon from the child radio device R01. Thereafter, the slave radio device R01 becomes inactive in the beacon emission mode.

  Next, the slave radio device R02 enters an active state in the beacon radiation mode, and transmits a beacon (information A) in step # 11. The beacon is received by the parent radio device R00. In this example, the number of relay stages for the child radio device R07 as the destination (end point) is one from the child radio device R02, and the number of relay steps from the parent radio device R00 to the child radio device R02 is one. In other words, the child radio device R02 on the information receiving side as seen from the parent radio device R00 on the information transmitting side has “the number of relay stages to the destination is smaller than that of itself (that is, the destination can approach the destination), and The first condition that the number of relay stages is the first-stage radio device R is satisfied. Therefore, when receiving the beacon (information A) transmitted from the slave radio device R02, the master radio device R00 specifies the transmission source radio number of the slave radio device R02 and transmits the information B in step # 12. Thus, at this stage, a partner that can transmit information with a relatively strong signal is preferentially selected, and a communication path that approaches (that is, arrives earlier) the wireless device R that is the end point is preferential. Selected.

  Information B includes information such as a sequence number, a transmission source radio number, a network number, a local radio number, a destination radio number, and the number of relay stages to the destination. Here, the own radio number is a number unique to the own radio device R (parent radio device R00), the destination radio number is a number unique to the child radio device R07 that is the end point, and the number of relay stages to the destination Is the number of relay stages (two stages) from the master radio device R00 to the slave radio device R07. This information B becomes inquiry information as to whether or not it is involved in information communication to the radio equipment R that is the end point.

  After that, when receiving the inquiry information, the information receiving-side radio device R sends a reply indicating that it is involved in information communication to the end-point radio device R if the predetermined communication participation condition is satisfied. If the predetermined communication participation condition is not satisfied, a reply indicating that the communication is not involved in the information communication to the end-point radio device R is sent to the radio device R on the information transmission side.

The above communication participation condition is
・ "The number of relay stages from the radio R on the information transmission side to itself is one", or
"If the number of relay stages from the information transmitting side radio R to itself is two or more, the number of relay stages from the radio R on the information transmitting side to the end point is the end point. The number of relay stages to the radio R is less than or equal to the number of relay stages from the radio R on the information transmission side to the radio R as the end point.
It is.

  In the example shown in FIG. 3, since the number of relay stages from the parent radio device R00 to itself (slave radio device R02) is one, “the number of relay steps from the information transmitting side radio device R to itself is one. Is satisfied. For this reason, the slave radio device R02 sends the transmission source of the parent radio device R00 in step # 13 of FIG. 3 in order to send a reply indicating that it is involved in information communication to the radio device R07 as the end point to the radio device R on the information transmission side. The radio number is specified and information C is transmitted. The information C includes information indicating information transmission OK, information such as a sequence number, a transmission source radio number, a network number, and a local radio number. Receiving this information C, the parent radio device R00 next transmits information D in step # 14.

  Information D includes information indicating communication contents (request for meter reading value of meter M07) as sequence data, sequence number, transmission source radio number, network number, own radio number, caller radio number, incoming call This includes information such as the information on the user's radio number, transfer status, packet lifetime (valid period), and information on whether or not it is a retry (retransmission). As described above, the parent radio device R00 as the starting point transmits the forward credit data including the information indicating the validity period of the forward credit data.

  When the slave radio device R02 receives the information D, in step # 15, the slave radio device R02 transmits information E indicating that the data has been normally received. The information E includes information indicating that data has been normally received, information such as a sequence number, a transmission source radio number, a network number, and a local radio number.

  When the series of steps as described above is completed, the parent radio device R00 shifts to the beacon emission mode.

  In step # 16, the slave radio device R02 determines whether or not the data valid period has expired. If the valid period has expired, the sub radio R02 does not process data. If the valid period has not expired, the sub radio R02 enters the communication mode to function as the radio R on the information transmission side. Transition. And the process shown by process # 21-process # 25 of FIG. 3 is started. Since the processes shown in the process # 21 to the process # 25 have the same contents as those described in the process # 11 to the process # 15 described above, the description thereof is omitted.

  As described above, the master radio device R00 serving as the starting point sequentially sets the outgoing credit data to the child radio devices R serving as the end points, with each of the plurality of child radio devices R serving as the end point radio devices R. Send. Further, the child radio device R that is the end point that has received the forward credit data from the parent radio device R00 next operates as the radio device R that is the start point of itself, and the parent radio device R00 is the radio device R that is the end point. Reply data is transmitted to the parent radio device R00. At this time, the contents of the information transmitted and received between the wireless devices R are the same as those shown in FIG. By transmitting data from the master radio device R00 to each slave radio device R and transmitting data from each slave radio device R to the master radio device R00, the master radio device R00 can receive each child radio device R00. Meter reading data of the meter M can be collected from the wireless device R. Then, the master radio device R00 stores the meter reading data (ie, reply data) of the meter M sent from each slave radio device R in a memory (not shown) or the like.

  When a problem occurs in information communication between a plurality of radio devices R, the master radio device R00 may not be able to receive meter reading data. In view of such a problem, when there is a child radio device R that is a specific end point that has not yet received reply data after transmitting the outgoing data, the parent radio device R00 The data of the traffic credit toward the child radio device R serving as the specific end point is provided on the condition that the elapsed time since the transmission of the data of the traffic credit toward the child radio device R exceeds the predetermined limit period. Retry processing to send again. This retry process is the same as the information communication procedure described with reference to FIG. 3 except that the information D includes information indicating “retry”.

  The parent radio device R00 that is the starting point sets the effective period included in the information D to a length that is half or less of the predetermined limit period, and the child radio device R that is the end point by the parent radio device R00 is the starting point. When operating as the wireless device R, the valid period of the reply data is set to a length that is half or less of a predetermined limit period. For example, the parent radio device R00 as the starting point sets 120 seconds as the limit period, and stores it in association with the sequence number itself. In addition, the parent radio device R00 sets the packet survival time (valid period) of each data to 60 seconds, and the child radio device R that is the end point by the parent radio device R00 is the radio device R that is the starting point. When operating, the validity period is newly set to 60 seconds.

  Then, the master radio device R00 sets a period longer than the valid period of the previously transmitted data as the valid period included in the information D when the retry process is performed. In this case, since the valid period is long in the retry process, even if it takes a long time to transmit and receive information between the wireless devices R, the transmission from the parent wireless device R00 as the start point to the child wireless device R as the end point is made. There is a high probability of receiving credit data. Since the child radio device R that is the end point can recognize that the information D includes information indicating “retry”, when sending the reply data in the retry process, the reply data is valid. The period may be lengthened.

  As described above, even if there is a slave radio device R that has not yet received reply data, the master radio device R00 can perform a retry process and request a reply. The retry process is an end point. The elapsed period from the transmission of the forward credit data to the child radio R has exceeded a predetermined limit period longer than the sum of the valid period of the forward credit data and the valid period of the reply data. Therefore, a plurality of data packets relating to meter reading value collection do not coexist between the wireless devices R. Therefore, it is possible to provide a radio communication system that can appropriately perform information communication between the parent radio device R00 and the plurality of child radio devices R.

Second Embodiment
In the above-described embodiment, an example in which information communication is performed with respect to the radio device R having the first relay stage number from the information transmission side radio device R has been described. Information communication may be performed with respect to the second-stage radio device R. In other words, information communication may be performed to the radio device R having the second relay stage number without passing through the radio device R having the first relay stage number from the information transmitting side radio device R. is there.

  FIG. 4 is a diagram illustrating communication processing performed between the wireless devices R. In this example, the slave radio device R03 enters an active state in the beacon emission mode, and transmits a beacon (information A) in step # 31. The beacon is received by the parent radio device R00. In this case, the number of relay stages for the child radio device R07 as the destination (end point) is one from the child radio device R03, and the number of relay steps from the parent radio device R00 to the child radio device R03 is two. In other words, the child radio device R03 on the information receiving side as viewed from the parent radio device R00 on the information transmitting side has the first condition (“the number of relay stages to the destination is smaller than that of itself) in the communication partner conditions shown in Tables 1 and 2. (That is, the wireless device R whose first stage is the relay stage number from itself) is not satisfied, but the second condition ("the wireless stage whose second relay stage number is more than the second stage") is not satisfied. Machine R ") is satisfied. Therefore, when receiving the beacon (information A) transmitted from the slave radio device R03, the master radio device R00 specifies the transmission source radio number of the slave radio device R03 and transmits information B in step # 32.

Thereafter, the child radio device R03 transmits the parent radio device R00 in step # 33 of FIG. 4 in order to send a reply to the information transmission side parent radio device R00 to the effect that it is involved in information communication with the radio device R07 as the end point. The original radio number is specified and information C is transmitted. Next, in step # 34, the master radio device R00 that has received this information C transmits information D including information indicating communication contents (request for meter reading value of the meter M07) as outgoing credit data.
Then, when receiving the information D, the slave radio device R03 transmits information E indicating that the data has been normally received in step # 35.

<Another embodiment>
<1>
In the above embodiment, the configuration of the wireless communication system of the present invention has been described with a specific example, but the configuration can be changed as appropriate.
For example, although FIG. 1 illustrates an example in which the parent radio device R00 and the child radio devices R01 to R07 are installed in the facility 1, the number of the child radio devices R and the like can be changed as appropriate.

<2>
In the above-described embodiment, when data is transmitted to the radio device R that is a specific end point by the retry process, the number of relay stages from one radio device R is directly to another radio device R having the second or higher stage. Information communication may be prohibited. For example, including the prohibition of direct information communication from the information transmission side radio device R to the information reception side radio device R having the second or higher number of relay stages in the communication partner condition or communication participation condition described above. Also good. As a result, in the retry process, direct information communication from one radio device R to another radio device R having the second or higher number of relay stages is prohibited. Information communication for retry processing is performed while selecting.

  INDUSTRIAL APPLICABILITY The present invention can be used for a wireless communication system that can appropriately perform information communication between a parent wireless device and a plurality of child wireless devices.

1 Facility L Dwelling Unit M Meter R Radio

Claims (6)

Provided with a plurality of radios including one master radio and a plurality of slave radios fixedly installed in the facility,
One-step information communication is performed to the radio device that is the end point at a position where the signal directly reaches from the radio device that is the start point, or the signal is not directly reached from the radio device that is the start point Information communication from the wireless device that is the starting point to the wireless device that is the ending point by performing multiple stages of information communication via the wireless devices that are in positions where signals can directly reach the wireless device that is the ending point A wireless communication system in which
The master wireless device as a starting point sequentially transmits data of outgoing credits toward the child wireless devices as a plurality of end points, with each of the plurality of child wireless devices as the wireless device as an end point, and The child radio device that is the end point that has received the outbound trust data from the parent radio device then operates as the radio device that is the starting point, and the parent radio device is the parent device that is the end point. Send reply data to the radio,
The parent wireless device that is the starting point transmits information on the forward trust data including information indicating a validity period of the forward trust data, and the slave wireless device that is the end point by the parent wireless device is: When operating as the wireless device that is the starting point of itself, send the reply data including information indicating the validity period of the reply data,
The radio is configured not to process the data when the validity period of the received data has expired;
When there is the child radio device that is a specific end point that has not yet received the reply data after transmitting the outgoing data, the parent radio device has the child radio device that is the specific end point. The elapsed period from the transmission of the outbound credit data to the destination has exceeded a predetermined limit period longer than the sum of the effective period of the outbound credit data and the effective period of the reply data. As a condition, a wireless communication system that performs a retry process of transmitting the outgoing credit data again toward the child wireless device serving as the specific end point.   2. The wireless communication according to claim 1, wherein, when performing the retry process, the master wireless device sets a period longer than an effective period of the outgoing credit data previously transmitted as an effective period of the outgoing credit data. system. Each of the plurality of wireless devices has another wireless device at a position where a signal having a strength of a predetermined value or more reaches directly from one wireless device, and the number of relay stages from the one wireless device is the first stage. Information about the number of relay stages to the other radio set based on the radio set, which is determined in the format considered as the radio set, and the radio whose first stage is the relay set number from the radio set Communication, which is an operation mode when storing the relay stage number information including information on the number of relay stages to the other radio equipment based on the machine, and transmitting the data to the radio equipment as the end point Switching between a mode and a beacon emission mode in which a temporarily active state that emits a beacon and other inactive states are repeated alternately,
When information communication is performed between the wireless device on the information transmitting side and the wireless device on the information receiving side,
When the radio on the information transmitting side shifts to the operation in the communication mode, the radio on the information receiving side enters a beacon waiting state for receiving a beacon emitted by the radio on the information receiving side operating in the beacon emission mode. And when receiving the beacon emitted by the wireless device on the information receiving side when the beacon is waiting, if the wireless device on the information receiving side satisfies a predetermined communication partner condition, Send inquiry information about whether or not you are involved in information communication to the radio,
When the wireless device on the information receiving side receives the inquiry information, if the predetermined communication participation condition is satisfied, the wireless device on the information transmitting side sends a reply indicating that it is involved in information communication to the wireless device serving as the end point. Perform to the radio, and if the predetermined communication participation condition is not satisfied, send a reply to the radio on the information transmission side to the radio that does not participate in information communication to the radio that is the end point,
When the wireless device on the information transmitting side receives a reply from the wireless device on the information receiving side that it is involved in information communication to the wireless device that is the end point, the wireless device that is to be transmitted to the wireless device that is the end point The wireless communication system according to claim 1, wherein data is transmitted to the wireless device on the information receiving side. The predetermined communication partner conditions are:
The beacon received within the first reception waiting period after being in the beacon waiting state is radiated by the radio on the information receiving side that satisfies the first condition;
A beacon received within a second reception waiting period after the first reception waiting period is emitted by the radio on the information receiving side that satisfies the first condition and the second condition;
The beacon received after the second reception waiting period is emitted by the radio on the information receiving side that satisfies the first condition, the second condition, and the third condition,
The first condition is that the number of relay stages from the radio on the information receiving side to the radio that is the end point is less than the number of relay stages from the radio on the information transmitting side to the radio that is the end point, And, the number of relay stages from the radio on the information transmission side to the radio on the information reception side is one stage,
In the second condition, the number of relay stages from the radio on the information receiving side to the end-point radio is the same as the number of relay stages from the radio on the information transmitting side to the end-point radio. That is,
The wireless communication system according to claim 3, wherein the third condition is all of the wireless devices. The predetermined communication participation conditions are:
The number of relay stages from the radio on the information transmission side to the radio on the information reception side is one stage, or
When the number of relay stages from the radio on the information transmitting side to the radio on the information receiving side is two or more, the radio from the radio on the information receiving side to the radio serving as the end point The wireless communication system according to claim 3 or 4, wherein the number of relay stages is equal to or less than the number of relay stages from the wireless device on the information transmission side to the wireless device serving as an end point.   When the data is transmitted to the radio device that is the specific end point by the retry process, information directly from one radio device to another radio device having the second or more relay stage number The wireless communication system according to any one of claims 3 to 5, wherein communication is prohibited.

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