JP2014120938A - Mesh radio communication network system, radio communication method, and radio terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a radio terminal to transmit measurement data received from another radio apparatus and stored in a memory in a lump at timing when an amount of the measurement data has exceeded a predetermined buffer capacity, or transmit the measurement data in a lump at measurement timing of the radio terminal even when the amount of the measurement data does not exceed the predetermined buffer capacity.SOLUTION: A radio terminal performs measurement on a measurement target of the radio terminal (S3); and executes editing processing of a measurement data buffer and transmits measurement data stored in the edited measurement data buffer when measurement of the radio terminal has ended (S4 and S5). On the other hand, the radio terminal executes editing processing of the measurement data buffer together with reception of measurement data (S9); determines whether or not the measurement data buffer is full when completing the editing processing (S10); executes data transmission processing if the measurement data buffer is full (S11); and returns to sleep if the measurement data buffer is not full.

Description

  The present invention relates to a mesh wireless communication network system, a wireless communication method, and a wireless terminal that notify measurement results (measurement data) from a plurality of wireless terminals having a measurement function to one aggregation device (host).

  As a low power consumption type mesh wireless communication system, all wireless devices transmit short beacons at regular intervals, and wireless devices that want to transmit data transmit connection requests in synchronization with the beacons and handshake with specific wireless devices It is known that the data is transmitted by performing the above, and by repeating this, the data is delivered to the target wireless device while transferring the data by the bucket relay method.

  In this case, all wireless devices have network configuration information in their own wireless device, and select an efficient transfer route by selecting a beacon from a wireless device closer to the target wireless device than themselves. (This method is generally called an N × N mesh wireless communication method or the like).

  As a sub-stream of the above N × N mesh wireless communication system, in a type (1 × N mesh wireless communication system) in which measurement results of all wireless devices are collected by one aggregation device, each wireless device has distance information to the aggregation device. By holding (configuration information) and transferring data to a radio device closer to the aggregation device (having a smaller number of hops) than itself, the data is finally delivered to the aggregation device.

  In Patent Document 1 shown below, when data is transmitted from a communication device (wireless sensor node) to a management device (server node), a plurality of measurement data collected periodically are accumulated and designated. A technique is described in which notification information (data packet) is generated based on data stored when data for a plurality of cycles is stored, and the generated notification information is transmitted to a management apparatus. In this case, each communication device transmits notification information (data packet) to the management device at a different period in each communication device.

  Patent Document 1 shown below receives notification information according to the transfer order when notification information (data packet) is transmitted from a specific communication device, and adds collected data to the received notification information. A technique is described in which notification information (data packet) to which collected data is added is transferred in accordance with the transfer order.

Japanese Patent No. 4354838

  In the conventional 1 × N mesh wireless communication system described above, when data is received by the data transfer of the bucket relay system, transmission to the next wireless device (data transfer) is started immediately. In such a wireless device, all data of the wireless devices involved in the bucket relay data transfer pass, and there is a possibility that a specific wireless device is overloaded. For this reason, the battery (DC power supply) of a specific wireless device is consumed rapidly, and as a result, the life of the entire mesh wireless communication system is shortened. Further, local concentration of data leads to a congestion state of communication, increasing the possibility of communication abnormality and data loss.

  Therefore, the present invention transmits the measurement data received from other wireless devices stored in the memory collectively at a timing exceeding a predetermined buffer capacity, or collects the data without exceeding the predetermined buffer capacity at the measurement timing of the own wireless terminal. It is an object of the present invention to provide a mesh wireless communication network system, a wireless communication method, and a wireless terminal that can be transmitted.

  In order to achieve the above object, in the mesh wireless communication network system of the present invention, the wireless terminals constituting the mesh wireless communication network cover a wide range with low output wireless output, perform predetermined measurement at regular time intervals, and A mesh wireless communication network system for transferring a plurality of wireless terminals to a higher-level aggregation device using a bucket relay method, wherein each of the wireless terminals includes at least a wireless transmission circuit, a wireless reception circuit, and transmission / reception switching A control unit that controls the entire radio terminal, the control unit that controls the entire radio terminal stores the measurement data in a transmission buffer when the measurement data is received from another radio terminal, and Transmission buffer storage means for storing measurement data in the transmission buffer, and the capacity of the transmission buffer is full. The first transmission control means for collectively transmitting the measurement data stored in the transmission buffer from the own wireless terminal to the wireless terminal closer to the aggregation device, even if the capacity of the transmission buffer is not full A second transmission control means for bundling with the measurement data stored in the transmission buffer and transmitting the measurement data of the terminal at a predetermined timing to the wireless terminal close to the counting device. The counting device includes measurement data receiving means for receiving the measurement data sent from the latest wireless terminal in a bundle.

  In order to achieve the above object, the wireless communication terminal of the present invention is configured so that the wireless terminals constituting the mesh wireless communication network cover a wide area with low output wireless output, perform predetermined measurement at regular time intervals, and perform measurement. A wireless terminal in a mesh wireless communication network system that transfers data by a bucket relay system to a higher-level aggregation device, and each of the wireless terminals includes at least a wireless transmission circuit, a wireless reception circuit, A transmission / reception switching circuit; an antenna; and a control unit that controls the entire wireless terminal, wherein the control unit that controls the entire wireless terminal stores the measurement data in a transmission buffer and receives the measurement data from another wireless terminal. The transmission buffer storage means for storing terminal measurement data in the transmission buffer, and the capacity of the transmission buffer is full. Sometimes, the first transmission control means for transmitting the measurement data stored in the transmission buffer from the own wireless terminal to the wireless terminal closer to the counting device and the transmission buffer even if the capacity of the transmission buffer is not full. A second transmission control unit that, when the measurement data of the terminal is acquired at a predetermined timing, is bundled with the measurement data stored in the transmission buffer and is collectively transmitted to the wireless terminal close to the aggregation device. Features.

In order to achieve the above object, the mesh wireless communication method of the present invention is such that a wireless terminal constituting a mesh wireless communication network covers a wide area with a low output wireless output, performs a predetermined measurement at a constant time interval, A wireless communication method in a mesh wireless communication network system in which a plurality of wireless terminals are transferred by a bucket relay method to a higher-level aggregation device, and each of the wireless terminals receives the measurement data from another wireless terminal When storing the measurement data of the own radio terminal in the transmission buffer and storing the measurement data of the own radio terminal in the transmission buffer when the capacity of the transmission buffer becomes full The process of transmitting from the terminal to the wireless terminal closer to the aggregation device, or the capacity of the transmission buffer is not full. Both the measurement data of its own terminal, when the measurement data is acquired at a predetermined timing, bundled with the measurement data stored in the transmission buffer, and collectively transmitted to the wireless terminal close to the aggregation device, the aggregation device, , The process of receiving the measurement data sent from the latest wireless terminal in a bundle,
It is characterized by including.

  In order to achieve the above object, a program for causing a computer of a wireless terminal according to the present invention to function allows a wireless terminal constituting a mesh wireless communication network to cover a wide range with a low output wireless output, and at a constant time interval. A wireless terminal in a mesh wireless communication network system that performs predetermined measurement and transfers a plurality of wireless terminals to a higher-level aggregation device using a bucket relay method, and the wireless terminal transmits the measurement data to other wireless devices When receiving from the terminal, the transmission buffer storage means for storing the measurement data of the own wireless terminal in the transmission buffer and storing the measurement data of the own wireless terminal in the transmission buffer, the computer of the wireless terminal, when the capacity of the transmission buffer is full The measurement data stored in the transmission buffer are collectively collected from the own wireless terminal by the aggregation device. First transmission control means for transmitting to a wireless terminal close to the measurement data stored in the transmission buffer when the measurement data of the own terminal is acquired at a predetermined timing even when the transmission buffer is not full It is made to function as a second transmission control means for bundling and transmitting to a wireless terminal close to the totaling device.

  According to the present invention, the measurement data in the own wireless terminal and the measurement data received from the other wireless terminal are accumulated in the memory and the transmission processing is performed at the measurement timing in the own wireless terminal regardless of the positional relationship with the counting device. The measurement data received from other wireless devices that are executed or stored in the memory is transmitted when the specified buffer capacity is exceeded, so the battery (DC power supply) of a specific wireless terminal is rapidly consumed The trend can be mitigated.

  In addition, since the amount of communication can be reduced, it is possible to alleviate the congestion state of communication.

It is a figure which shows the structural example of the mesh radio | wireless communication network system which concerns on embodiment of this invention. It is a functional block diagram which shows the structure of the radio | wireless terminal which concerns on embodiment of this invention. It is a figure explaining the control example of the measurement data buffer at the time of transmission of the radio | wireless terminal which concerns on embodiment of this invention. It is a figure which shows an example of the handshake procedure between the radio | wireless terminals of a mesh radio | wireless communication network system. It is a figure which shows an example of the relay frame format in the mesh radio | wireless communication network system which concerns on embodiment of this invention. It is a figure which shows the measurement data (DATA) format example which concerns on embodiment of this invention. It is a figure which shows the operation processing flow of each radio | wireless terminal of the mesh radio | wireless communication network system which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a diagram illustrating a configuration example of a mesh wireless communication network system according to an embodiment of the present invention. In FIG. 1, the mesh wireless communication network system according to the embodiment of the present invention includes a totaling device 10 and wireless terminals 1 to 7. In the mesh wireless communication network system according to the embodiment of the present invention, the wireless terminals constituting the mesh wireless communication network perform predetermined measurements at regular time intervals, and the measurement results (measurement data) are sent to the upper aggregation device 10. A plurality of wireless terminals are transferred by a bucket relay system and delivered, and a wide output range can be covered with a low output wireless output. Note that the counting device 10 is configured to include a personal computer or the like, and it is assumed that the request for reducing power consumption in the counting device 10 is low.

  In FIG. 1, as an example, the case where the measurement data is transferred to the counting device 10 via the wireless terminal 4, the wireless terminal 2, and the wireless terminal 1 with the wireless terminal 6 as a transmission source is shown. The wireless terminal 3, the wireless terminal 5, and the wireless terminal 7 that are not involved in the transfer are also shown as components of the mesh wireless communication network system, and similarly, data can be transferred to the upper aggregation device 10 by the bucket relay method. And as a structure of a radio | wireless terminal, about the thing provided with a measurement part, a control part, and a radio | wireless part, it has shown in the block diagram in the radio | wireless terminal 4 of FIG. This will be described with reference to FIG. The arrangement of each wireless terminal is not fixed and can be moved, and the arrangement shown in FIG. 1 is merely an example. The mutual arrangement relationship excluding the counting device 10 is grasped by updating the configuration information well known to those skilled in the art.

In FIG. 2, the wireless terminal 11 performs measurement on the measurement object 9 in a regular cycle to acquire measurement data (measurement result), and a wireless unit 13 including a wireless transmission circuit 14 and a wireless reception circuit 15. The memory control unit 32 controls the measurement data in units of buffers (explained as 16 bytes as an example, but is not limited to this value), the memory 33 holding the measurement data under the memory control unit 32, and the transmission / reception sequence The control unit 12 includes at least a transmission / reception sequence control unit 35. In more detail,
The measurement unit 19 measures the measurement object 9 at a predetermined time interval, for example, at a one-minute interval, based on an operation instruction (a control line for instructions or the like is indicated by a broken line) issued when a predetermined time has elapsed from the intermittent operation control unit 20. And the measurement result is passed to the control unit 12. The control unit 12 holds this measurement result in a predetermined area (measurement data buffer area) of the memory 33.

  The wireless unit 13 operates the wireless transmission circuit 14 by the transmission / reception sequence control unit 35 of the control unit 12 under an operation instruction issued when a predetermined time has elapsed from the intermittent operation control unit 20 to the control unit 12, thereby generating a beacon. The data is transmitted at a constant period, for example, a period of 5 seconds, and measurement data from another wireless terminal is received by the wireless reception circuit 15 in response to this, and passed to the controller 12. The transmission / reception sequence control unit 35 of the control unit 12 instructs the data reception unit 36 to hold the measurement data transmitted from another wireless terminal in a predetermined area (measurement data buffer area) of the memory 33. The transmission / reception sequence control unit 35 receives and analyzes the data received by the wireless reception circuit 15 via the data reception unit 36, and executes sequence control performed thereafter. For example, if the received data is a connection request packet, a connection permission packet is transmitted to the transmission source. The communication sequence will be described in detail with reference to FIG.

  In addition, the wireless unit 13 refers to configuration information (not shown) held in the memory 33 and the control unit 12 selects a wireless terminal closer to the counting device 10 (having a smaller number of hops) than its own wireless terminal. Then, the measurement data held in a predetermined area of the memory 33 is transferred to the wireless terminal close to the aggregation device 10 selected above via the data transmission unit 34 and the wireless transmission circuit 14 (for bucket relay type data transfer). Applicable).

  The control unit 12 includes a CPU (not shown), and under the control of the CPU, the measurement data received by the wireless reception circuit 15 of the wireless unit 13 is transferred to a predetermined area of the memory 33 via the data reception unit 36. When the measurement data in the own terminal obtained at a predetermined cycle is received from the measurement unit 19, the received measurement data and the measurement data of other wireless terminals accumulated in a predetermined area of the memory 33 until then are received. The data is buffer-edited through the memory control unit 32 and transferred to the data transmission unit 34 so that the data can be transmitted in a bundle, and the data transmission unit 34 sends the measurement data passed to the radio unit 13 under the instruction of the transmission / reception sequence control unit 35. The data is sent to the wireless transmission circuit 14 and bundled from the wireless transmission circuit 14 and transmitted together.

  The control unit 12 receives measurement data from a plurality of wireless terminals and performs buffer editing through the memory control unit 32 so that the measurement data stored in a predetermined area of the memory 33 can be transmitted collectively. The memory control unit 32 detects whether or not the buffer capacity (in this embodiment, 8 buffer units) is exceeded. When the buffer capacity is full (hereinafter simply referred to as “buffer full”), the data transmission unit from the memory 33 34, the buffered measurement data is passed to the data transmission unit 34, and the data transmission unit 34 sends the measurement data passed to the wireless transmission circuit 14 of the wireless unit 13 under the instruction of the transmission / reception sequence control unit 35, The wireless transmission circuit 14 transmits all at once. At this time, the control unit 12 transmits data to the wireless terminal closer to the counting device 10 than the pre-selected wireless terminal. Note that the configuration for selecting a wireless terminal closer to the counting device 10 than its own wireless terminal is employed in the above-described known N × N mesh wireless communication system, and thus description thereof is omitted here.

  If the received measurement data from a plurality of other wireless terminals exceeds a predetermined buffer capacity, the measurement data for the buffer unit exceeding the buffer capacity is temporarily stored in a memory area different from the buffer area of the memory 33. In addition, until the next transmission timing, the measurement data for the buffer unit exceeding the buffer capacity is buffer-edited and arranged at the upper level of the transmission buffer (described later) and controlled so that it can be transmitted at the next transmission timing. This will be described in detail later.

  The intermittent operation control unit 20 has a time counting function (time counting function), starts counting time from an instruction from the control unit 12 and counts the elapsed time, and the counted elapsed time is calculated by the control unit 12 and the measurement unit. 19 is notified. However, it does not have a time adjustment function with the aggregation device 10 of this embodiment or another wireless terminal.

  FIG. 3 is a diagram illustrating a control example of the measurement data buffer at the time of transmission by the wireless terminal according to the embodiment of the present invention. FIG. 3 shows that each wireless terminal is provided with a measurement data buffer having a full capacity of 8 buffer units.

  FIG. 3 shows that a measurement data to be transferred from another wireless terminal is stored in a measurement data buffer having a buffer capacity of 8 buffer units already stored in a measurement data buffer. The buffer control operation when data is received will be described.

  That is, as shown in the second from the top in FIG. 3, the measurement data buffer before receiving measurement data in a certain wireless terminal holds four pieces (A1 to A4) in units of buffers as measurement data to be transferred. The remaining buffer capacity indicates that there is a space in units of 4 buffers. In that case, if the measurement data included in the data received from the other wireless terminal is 3 or less per buffer, it is stored as it is in the measurement data buffer. In this example, it is shown at the top of FIG. As described above, since data including 6 pieces of measurement data (B1 to B6) in the buffer unit is received, the predetermined buffer capacity (in this embodiment, 8 buffer units) is exceeded, and the received 6 pieces of measurement data are received. Data cannot be transmitted in a lump, and two buffer units (B5, B6) cannot be transmitted, as shown third from the top in FIG.

  Therefore, as shown in the fourth from the top in FIG. 3, transmission is performed for the measurement data buffer that is full (eight buffer units, that is, A1 to A4, B1 to B4). As a result, the measurement data buffer at the time of transmission (hereinafter also referred to as “transmission buffer”) becomes empty, and the remaining two buffer units (B5, B6) received from other wireless terminals in the empty buffer are measured. The data is buffer-edited and stored again at the top of the transmission buffer as shown in the third part from the top in FIG. 3, and the next measurement data from another wireless terminal is applied to the transmission buffer at the next transmission timing. Or when the measurement data is acquired in the transmission buffer in the acquisition of the measurement data in the own wireless terminal, it is transmitted together at the acquisition timing.

  FIG. 4 is a diagram for explaining a handshake procedure in the mesh wireless communication system. In this embodiment, the handshake procedure is used to advance a transmission / reception sequence between wireless terminals. The handshake procedure in the present embodiment is executed by the transmission / reception sequence control unit 35 provided in the control unit 12 of the wireless terminal 11 shown in FIG.

  In FIG. 4, the wireless terminal A that is the transmission source of measurement data first transmits a beacon request packet. The counting device 10 is always waiting for a beacon request, and if there is a beacon request from a certain wireless terminal, it immediately transmits a beacon. In the case of this example, since the beacon request radio wave did not reach the counting device 10, it is assumed that the counting device 10 did not emit a beacon.

  Now, after transmitting the beacon request packet, the wireless terminal A simply waits for a beacon transmitted from another wireless terminal to arrive at a certain period in order to transmit measurement data after completing the measurement process. Waiting for 10 seconds, continuing the state. In other words, since the other wireless terminals are not in the normal reception state, the beacon request packet is ignored, and the beacon is not immediately transmitted. The wireless terminal B transmits a beacon at regular intervals, and the beacon includes distance information from the wireless terminal B to the counting device 10. The wireless terminal A that has received the beacon from the wireless terminal B compares the distance information included in the beacon with the distance from the own terminal to the counting device 10, and if the wireless terminal B is closer to the counting device 10 than the own terminal. A connection request packet is transmitted to the wireless terminal B.

  The wireless terminal B that has received the connection request packet returns a connection permission packet if the measurement data can be received. The wireless terminal A that has received the connection permission packet transmits the measurement data, and completes a series of data transfer processing sequences with an acknowledgment from the wireless terminal B. Even if the wireless terminal A receives a beacon from the counting device 10 instead of the wireless terminal B, the subsequent processing is the same, and the description thereof is omitted.

  Here, if the beacon period transmitted by each wireless terminal is 5 seconds, the timeout period for waiting for the beacon needs to be set to about 10 seconds. A plurality of wireless terminals emit beacons at regular intervals. Since the mesh wireless communication network system according to the embodiment of the present invention also adopts this handshake procedure, on average, it takes about 2.5 seconds until beacon reception. Will continue waiting for the beacon. During this time, the wireless unit 13 shown in FIG. 2 consumes power because it is in a receiving state. Therefore, in order to save power, it is effective to reduce the number of transmissions in order to maintain the mesh wireless communication network system, and it is effective to perform transmission control of measurement data as in this embodiment. It will be a trick.

  FIG. 5 is a diagram showing an example of a relay frame format in the mesh wireless communication network system according to the embodiment of the present invention. The relay frame format is, for example, the measurement data from the wireless terminal 6 shown in FIG. 1 as the transmission source, the measurement data of the wireless terminal 4, the measurement data of the wireless terminal 2, and the measurement data of the wireless terminal 1 in a predetermined area in the frame. Each format is stored and relayed (transferred) as measurement data to the counting device 10.

  In FIG. 5, the relay frame format is a 1-byte long sender wireless terminal in the next area, starting with a 1-byte long start sequence number (STT-No) numbered in order from the start of measurement at the data transmission source. Number (STT-RNo), 1 byte long receiver wireless terminal number (aggregation device ID) (STP-RNo) in the next area, 1 byte long measurement data count (1 8) (DATA-No), the last area includes a measurement data group (data concatenated by the number of DATA-Nos in FIG. 6 described later) (DATA) whose length is DATA 18 bytes × DATA-No. It is configured.

  FIG. 6 is a diagram showing a measurement data (DATA) format example according to the embodiment of the present invention. FIG. 5 shows a format example of 18 bytes of DATA existing in the area shown at the end of the relay frame format in FIG. 5, with a 1-byte long instrument number at the top and a 1-byte long data attribute in the next area. The last area is configured to include 16 bytes as measurement value data.

  FIG. 7 is a diagram showing an operation processing flow of each wireless terminal of the mesh wireless communication network system according to the embodiment of the present invention. Since the wireless terminal according to the embodiment of the present invention adopts the handshake procedure as shown in FIG. 4 to establish communication, as described above, refer to FIG. 4 as appropriate. Therefore, “sleep” is selected as the base point of operation of each wireless terminal. In step S1, it is checked whether the sleep of a certain wireless terminal has elapsed for 5 seconds. Here, 5 seconds is used as a reference because beacon transmission of each wireless terminal is executed in a cycle of 5 seconds as an example. If 5 seconds have not elapsed, the process returns to sleep again. If 5 seconds have elapsed, the process proceeds to step S2.

  In step S2, it is checked whether 1 minute has passed. Here, 1 minute is used as a reference because the measurement cycle in each wireless terminal is executed at intervals of 1 minute as an example. As a result, if one minute has passed, the process proceeds to step S3. In step S3, measurement is performed on the measurement target 9 in the own wireless terminal. In step S4, the measurement data buffer is edited. The editing process of the measurement data buffer here corresponds to executing the process shown in the fourth from the top in FIG. 3, but the measurement result of the own wireless terminal can be obtained even if the buffer is not full as shown in the figure. The measurement data buffer is edited at the end of measurement of the own wireless terminal after being held, and the measurement data held in the edited measurement data buffer is sent to the wireless transmission circuit 14 of the wireless unit 13 via the data transmission unit 34, After bundling data from the wireless transmission circuit 14 and transmitting it in a batch, the process returns to the sleep at the start of processing.

  On the other hand, if 1 minute has not passed, it progresses to step S6 and performs beacon transmission in step S6. The beacon transmission notifies other wireless terminals that preparation for data reception is complete. Then, it progresses to step S7. In step S7, it is determined whether there is a connection request. If there is no connection request, the process returns to sleep at the start of processing. If there is a connection request, the process proceeds to step S8. In step S8, measurement data reception processing is performed, and the process proceeds to step S9.

  In step S9, the measurement data buffer editing process is executed with the reception of the measurement data. The editing process of the measurement data buffer here corresponds to executing the process shown second or third from the top in FIG. When the editing process ends, the process proceeds to step S10, and it is determined whether the measurement data buffer is full in step S10. If the measurement data buffer is not full, the process returns to sleep at the start of processing. If the measurement data buffer is full, the process proceeds to step S11, and a process of transmitting the data that has become full in step S11 is executed. When the data transmission process ends, the process returns to sleep at the start of the process.

1 to 7 Wireless terminal 9 Measurement object 10 Totaling device 11 Wireless terminal 12 Control unit 13 Wireless unit 14 Wireless transmission circuit 15 Wireless reception circuit 16 Switching unit 17 Antenna 18 DC power supply 19 Measurement unit 20 Intermittent operation control unit 32 Memory control unit 33 Memory 34 data transmitter 35 transmission / reception sequence controller 36 data receiver

Claims (4)

Wireless terminals that make up a mesh wireless communication network cover a wide range with low-power wireless output, perform predetermined measurements at regular time intervals, and use a bucket relay system to measure multiple wireless terminals up to a higher-level aggregation device A mesh wireless communication network system for transferring data,
Each of the wireless terminals
At least a wireless transmission circuit, a wireless reception circuit, a transmission / reception switching circuit, an antenna, and a control unit that controls the entire wireless terminal,
The control unit for controlling the entire wireless terminal is
Transmission buffer storage means for storing the measurement data of the own wireless terminal in the transmission buffer and storing the measurement data in a transmission buffer when the measurement data is received from another wireless terminal;
First transmission control means for transmitting, when the capacity of the transmission buffer is full, the measurement data stored in the transmission buffer to the wireless terminal closer to the counting device than the own wireless terminal;
Even when the capacity of the transmission buffer is not full, when the measurement data of the own terminal is acquired at a predetermined timing, the measurement data stored in the transmission buffer is bundled and transmitted to the wireless terminal close to the aggregation device. Second transmission control means,
The counting device is
Measurement data receiving means for receiving the measurement data sent in a bundle from the latest wireless terminal;
A mesh wireless communication network system comprising: Wireless terminals that make up a mesh wireless communication network cover a wide range with low-power wireless output, perform predetermined measurements at regular time intervals, and use a bucket relay system to measure multiple wireless terminals up to a higher-level aggregation device A wireless terminal in a mesh wireless communication network system for transferring data,
Each of the wireless terminals
At least a wireless transmission circuit, a wireless reception circuit, a transmission / reception switching circuit, an antenna, and a control unit that controls the entire wireless terminal,
The control unit for controlling the entire wireless terminal is
A transmission buffer storage means for storing the measurement data in the transmission buffer and storing the measurement data of the own wireless terminal in the transmission buffer when the measurement data is received from another wireless terminal;
First transmission control means for transmitting, when the capacity of the transmission buffer is full, the measurement data stored in the transmission buffer to the wireless terminal closer to the counting device than the own wireless terminal;
Even when the capacity of the transmission buffer is not full, when the measurement data of the own terminal is acquired at a predetermined timing, the measurement data stored in the transmission buffer is bundled and transmitted to the wireless terminal close to the aggregation device. A second transmission control means;
A wireless terminal comprising: Wireless terminals that make up a mesh wireless communication network cover a wide range with low-power wireless output, perform predetermined measurements at regular time intervals, and use a bucket relay system to measure multiple wireless terminals up to a higher-level aggregation device A wireless communication method in a mesh wireless communication network system for transferring data,
Each of the wireless terminals
Storing the measurement data in a transmission buffer when the measurement data is received from another wireless terminal and storing the measurement data of the own wireless terminal in the transmission buffer;
When the capacity of the transmission buffer is full, the process of transmitting the measurement data stored in the transmission buffer to the wireless terminal closer to the aggregation device than the own wireless terminal, or
Even when the capacity of the transmission buffer is not full, when the measurement data of the own terminal is acquired at a predetermined timing, the measurement data stored in the transmission buffer is bundled and transmitted to the wireless terminal close to the aggregation device. Process, including
The counting device is
A process of receiving the measurement data bundled and transmitted from the latest wireless terminal;
A mesh wireless communication method comprising: Wireless terminals that make up a mesh wireless communication network cover a wide range with low-power wireless output, perform predetermined measurements at regular time intervals, and use a bucket relay system to measure multiple wireless terminals up to a higher-level aggregation device A wireless terminal in a mesh wireless communication network system for transferring data, and when the wireless terminal receives the measurement data from another wireless terminal, the wireless terminal stores the measurement data of the own wireless terminal in the transmission buffer. A transmission buffer storage means;
A computer of the wireless terminal;
First transmission control means for transmitting, when the capacity of the transmission buffer is full, the measurement data stored in the transmission buffer to the wireless terminal closer to the counting device than the own wireless terminal;
Even when the capacity of the transmission buffer is not full, when the measurement data of the own terminal is acquired at a predetermined timing, the measurement data stored in the transmission buffer is bundled and transmitted to the wireless terminal close to the aggregation device. Second transmission control means;
Program to function as.