JP6402456B2 - Wireless communication network system, wireless terminal, time correction method, program - Google Patents

Description

  The present invention relates to a wireless communication network system, and in particular, each lower terminal corrects the time using time correction information added in downlink communication of a higher-level collection device, and each terminal determines all at once based on the corrected time. The present invention relates to a wireless communication network system in which measurement is performed at a given time and a collection device collects measurement data.

  A conventional wireless communication network system that wirelessly transmits some measurement results to a higher-level collection device at a fixed time interval using a wireless terminal that acquires measurement data is based on restrictions such as downsizing and cost reduction. It is not possible to use a highly accurate clock that synchronizes the operation of the terminal with respect to the clock of the central collection device.

  Therefore, conventionally, when the measurement data measured by each terminal is packetized and transmitted to a higher-level collection device while relaying other wireless terminals, the wireless terminal in the middle of the packet measured and transmitted by each terminal A wireless communication network that calculates the correct time measured by each terminal by relaying the packet while recording the time required for relaying the packet, and correcting the time by a collection device that collects information of the packet The system was adopted.

  On the other hand, in FIGS. 1 and 4 to 6 of Patent Document 1 below, in a multi-hop wireless network in which a plurality of wireless devices are connected in a tree shape with the backbone device as the root, the backbone device 12 has a superframe counted by the counter 20. The count value corresponding to the elapsed time from the start time of 50 is set in the slot synchronization storage unit 96 in the network information part in the packet 72, and the set packet 72 is broadcast in the time slot 62 assigned to the backbone device 12. The counter 22a of the first wireless device 16a changes the count value being counted to the count value set in the slot synchronization storage unit 96, and restarts counting from the changed count value. Is used to synchronize time, that is, relative time synchronization (time) between the backbone device 12 and the first wireless device 16a. Synchronization, the wireless network system that can take slave synchronization) have been disclosed.

JP 2010-233071 A

  Conventionally, in a wireless communication system such as a sensor network, a wireless terminal that wirelessly transmits a measurement result at a certain time interval to a higher-order collection device is included in the higher-order collection device because of restrictions such as downsizing and cost reduction. Because it is not possible to use a highly accurate clock that regulates the operation timing of its own terminal in synchronization with the clock, each terminal measures and records the time required for relaying in the packet sent to the upper collection device, Based on this, correct time was calculated by correcting with the higher-level collection device, but it is not possible for each terminal to measure at the same time and send the measurement result to the higher-level collection device. It was possible.

  In the time synchronization method between the backbone device and each wireless device in the wireless network system described in Patent Document 1, the backbone device 12 starts from the start time of the superframe 50 set in the slot synchronization storage unit 96 in the network information portion. By synchronizing the time based on the count value according to the elapsed time, the relative time is synchronized between the backbone device 12 and the first wireless device 16a, and each time is determined at the same time. Nothing is said about the terminal taking measurements and sending the measurement results to the host collection device.

  Accordingly, an object of the present invention is that each terminal corrects the time based on the time correction information added to the downlink communication of the collection device, so that each terminal can perform measurement at the same time and transmit it to the collection device. It is to do.

Wireless communication network system of the present invention in order to achieve the above object, structure and radio transmission circuitry for transmitting data wirelessly, a plurality of wireless end end and a radio receiving circuit for receiving data transmitted wirelessly in a wireless communication network system that is, wireless communication network system includes a wireless terminal which is one of the collecting device, and a wireless terminal comprising a plurality of relay devices located downstream communication path from the wireless terminal as the the collection device Including
The wireless terminal serving as a collection device is:
When the transmission event for adding the time correction information to downlink communication packet is generated, the predetermined time period, and the radio receiving circuit of the radio terminal into operation, than the radio terminals located in the lower of the downlink communication path and it waits to receive the state of a beacon from another wireless terminal that can communicate directly between the own radio terminal, upon receiving the beacon in the period, by the radio transmission circuit of its own radio terminal into operation, wherein A transmission request transmission means for transmitting a transmission request to the other wireless terminal that is the transmission source of the beacon;
A reception confirmation signal receiving means for receiving a reception confirmation signal from the other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the transmission start time and the time correction information are transmitted to the other wireless terminal that is a transmission partner of the reception confirmation signal. Data transmission means for transmitting data including the elapsed time from the time of occurrence of the transmission event to the time of data transmission;
Data confirmation signal receiving means for receiving a data confirmation signal transmitted from the other wireless terminal that is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal to an operating state after data transmission by the data transmission means; Have
The wireless terminal serving as a relay device is:
Intermittently at a fixed period, and the wireless transmission circuit of the radio terminal to the operating state transmitting the beacon, in the operating state the radio receiving circuit of the radio terminal after transmitting the beacon, from the radio terminal An intermittent operation control means for receiving a transmission request transmitted from a first other wireless terminal located above the downlink communication path and capable of direct communication with the own wireless terminal ;
A transmission request receiving means for receiving a transmission request transmitted from the first other wireless terminal during an operation state of the wireless reception circuit of the own wireless terminal ;
When the transmission request receiving means receives the transmission request, a reception confirmation signal transmitting means for transmitting a reception confirmation signal to the first other wireless terminal by setting the wireless transmission circuit of its own wireless terminal to an operating state;
When the reception confirmation signal is transmitted, the wireless reception circuit of the own wireless terminal is put into an operation state, and the transmission correction time includes the transmission start time and the elapsed time from the occurrence of the transmission event to the data transmission time. Data receiving means for receiving data from the first other wireless terminal ;
Time correction means for correcting the own wireless terminal time based on the time correction information when the data is received;
When the data is received, a relay time measuring unit that starts a relay time measurement timer of the own wireless terminal to relay the data and measures a relay time in the own wireless terminal;
When receiving the data, the self above with the wireless receiver circuit to an operation state of the wireless terminal, a second possible direct communication between a position to and the radio terminal to the lower of the downlink communication path than the radio terminal other waits to receive the state of the beacon from the radio terminal, when receiving the beacon in the period, the self above with a radio transmitter circuit to an operation state of the terminal device, the second other said a beacon source A transmission request transmission means for transmitting a transmission request to the wireless terminal of
A reception confirmation signal receiving means for receiving a reception confirmation signal from the second other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the second other wireless terminal that is the transmission partner of the reception confirmation signal is used as the time correction information . time when the transmission start time the wireless terminal set to a collecting device from the reception time of the data received the data and the elapsed time until the data transmission time for the second other wireless terminal which is the source of the beacon Data transmission means for transmitting data including the elapsed time obtained by adding the elapsed time of
A data confirmation signal for receiving a data confirmation signal transmitted from the second other wireless terminal that is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal to an operating state after data transmission by the data transmission means Receiving means.

  In the above, the time correction information is added to a time information field in a header portion of a downlink communication packet, and the time information field includes a transmission start time (Tstart) and a relay time (Ttrans) in an area. And

To achieve the above object, a wireless terminal serving as a collection device in a wireless communication network system of the present invention includes a wireless transmission circuit that transmits data wirelessly and a wireless reception circuit that receives data transmitted wirelessly. in a wireless communication network system including a plurality of wireless terminals end, wireless communication network system includes a wireless terminal which is one of the collecting device, a plurality of relay located downstream communication path from the wireless terminal as the the collection device comprises a radio terminal as the device,
The wireless terminal serving as a collection device is:
When the transmission event for adding the time correction information to downlink communication packet is generated, the predetermined time period, and the radio receiving circuit of the radio terminal into operation, than the radio terminals located in the lower of the downlink communication path and it waits to receive the state of a beacon from another wireless terminal that can communicate directly between the own radio terminal, upon receiving the beacon in the period, by the radio transmission circuit of its own radio terminal into operation, wherein A transmission request transmission means for transmitting a transmission request to the other wireless terminal that is the transmission source of the beacon;
A reception confirmation signal receiving means for receiving a reception confirmation signal from the other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the transmission start time and the time correction information are transmitted to the other wireless terminal that is the transmission partner of the reception confirmation signal. Data transmission means for transmitting data including the elapsed time from the time of occurrence of the transmission event to the time of data transmission;
Data confirmation signal receiving means for receiving a data confirmation signal transmitted from the other wireless terminal that is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal to an operating state after data transmission by the data transmission means; It is characterized by having

To achieve the above object, a wireless terminal serving as a relay device in the wireless communication network system of the present invention includes a wireless transmission circuit that wirelessly transmits data and a wireless reception circuit that receives data transmitted wirelessly. in a wireless communication network system including a plurality of wireless terminals end, wireless communication network system includes a wireless terminal which is one of the collecting device, a plurality of relay located downstream communication path from the wireless terminal as the the collection device comprises a radio terminal as the device,
The wireless terminal serving as a relay device is:
Intermittently at a fixed period, the own the radio terminal by the radio transmission circuit in an operating state send a bi bacon, and the operating state of the radio receiving circuit of the radio terminal after transmitting the beacon, from the radio terminal An intermittent operation control means for receiving a transmission request transmitted from a first other wireless terminal located above the downlink communication path and capable of direct communication with the own wireless terminal ;
A transmission request receiving means for receiving a transmission request transmitted from the first other wireless terminal during an operation state of the wireless reception circuit of the own wireless terminal ;
When the transmission request receiving means receives the transmission request, a reception confirmation signal transmitting means for transmitting a reception confirmation signal to the first other wireless terminal by setting the wireless transmission circuit of its own wireless terminal to an operating state;
When the reception confirmation signal is transmitted, the wireless reception circuit of the own wireless terminal is put into an operation state, and the transmission correction time includes the transmission start time and the elapsed time from the occurrence of the transmission event to the data transmission time. Data receiving means for receiving data from the first other wireless terminal ;
Time correction means for correcting the own wireless terminal time based on the time correction information when the data is received;
When the data is received, a relay time measuring unit that starts a relay time measurement timer of the own wireless terminal to relay the data and measures a relay time in the own wireless terminal;
When receiving the data, the self above with the wireless receiver circuit to an operation state of the wireless terminal, a second possible direct communication between a position to and the radio terminal to the lower of the downlink communication path than the radio terminal other waits to receive the state of the beacon from the radio terminal, when receiving the beacon in the period, the radio terminal said by the radio transmission circuit to an operation state of said second other said a beacon source A transmission request transmission means for transmitting a transmission request to the wireless terminal of
A reception confirmation signal receiving means for receiving a reception confirmation signal from the second other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the second other wireless terminal that is the transmission partner of the reception confirmation signal is used as the time correction information . time when the transmission start time the wireless terminal set to a collecting device from the reception time of the data received the data and the elapsed time until the data transmission time for the second other wireless terminal which is the source of the beacon Data transmission means for transmitting data including the elapsed time obtained by adding the elapsed time of
A data confirmation signal for receiving a data confirmation signal transmitted from the second other wireless terminal that is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal to an operating state after data transmission by the data transmission means Receiving means.

Time correction method of the present invention in order to achieve the above object is constructed as a radio transmitting circuit for transmitting data wirelessly, a plurality of wireless end end and a radio receiving circuit for receiving data transmitted wirelessly in that wireless communication network system, and a wireless terminal which is one of the collection device, in a wireless communication network system comprising a wireless terminal comprising a plurality of relay devices located downstream communication path from the wireless terminal as the the collection device A time correction method,
The wireless terminal serving as a collection device is:
When the transmission event for adding the time correction information to downlink communication packet is generated, the predetermined time period, and the radio receiving circuit of the radio terminal into operation, than the radio terminals located in the lower of the downlink communication path and it waits to receive the state of a beacon from another wireless terminal that can communicate directly between the own radio terminal, upon receiving the beacon in the period, by the radio transmission circuit of its own radio terminal into operation, wherein Send a transmission request to the other wireless terminal that is the source of the beacon,
Receiving the reception confirmation signal from the other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the transmission start time and the time correction information are transmitted to the other wireless terminal that is a transmission partner of the reception confirmation signal. Send data containing the elapsed time from the time of the transmission event to the time of data transmission,
After the data transmission, the wireless reception circuit of its own wireless terminal is put into an operating state, and a data confirmation signal transmitted from the other wireless terminal that is the transmission partner of the data is received,
On the other hand, the wireless terminal as a relay device is
Intermittently at a fixed period, and the wireless transmission circuit of the radio terminal to the operating state transmitting the beacon, in the operating state the radio receiving circuit of the radio terminal after transmitting the beacon, from the radio terminal Also receives a transmission request transmitted from the first other wireless terminal located above the downlink communication path and capable of direct communication with the own wireless terminal ,
When the transmission request is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and a reception confirmation signal is transmitted to the first other wireless terminal,
When the reception confirmation signal is transmitted, the wireless reception circuit of the own wireless terminal is put into an operation state, and the transmission correction time includes the transmission start time and the elapsed time from the occurrence of the transmission event to the data transmission time. Receiving data from the first other wireless terminal ;
When receiving the data, measures a relay time in the radio terminal is allowed to the radio terminal starts a relay time measurement timer for relaying the data is corrected on the basis of the own wireless terminal time with the time correction information and, when further receiving the data, the self above with the wireless receiver circuit to an operation state of the wireless terminal, capable of communicating directly between the position and and its own radio terminal to the lower of the downlink communication path than the radio terminal second waits to receive the state of the beacon from another wireless terminal such, upon receiving the beacon in the period, by the radio transmission circuit of its own radio terminal into operation, wherein the said is a beacon of sender sends a transmission request to the two other wireless terminals, receiving an acknowledgment signal from said second other wireless terminal which is the source of the beacon,
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the second other wireless terminal that is the transmission partner of the reception confirmation signal is used as the time correction information . time when the transmission start time the wireless terminal set to a collecting device from the reception time of the data received the data and the elapsed time until the data transmission time for the second other wireless terminal which is the source of the beacon Send the data containing the elapsed time that is added to the elapsed time of
After the data transmission, the wireless reception circuit of the own wireless terminal is set in an operating state to receive a data confirmation signal transmitted from the second other wireless terminal that is the transmission partner of the data.

A program to be executed by a computer that controls a wireless terminal serving as a collection device according to the present invention includes a plurality of wireless communication circuits including a wireless transmission circuit that transmits data wirelessly and a wireless reception circuit that receives data transmitted wirelessly. in a wireless communication network system configured by end end, comprising a wireless terminal which is one of the collecting device, and a wireless terminal comprising a plurality of relay devices located downstream communication path from the wireless terminal as the the collection device A computer of the wireless terminal serving as a collection device in a wireless communication network system,
When the transmission event for adding the time correction information to downlink communication packet is generated, the predetermined time period, and the radio receiving circuit of the radio terminal into operation, than the radio terminals located in the lower of the downlink communication path and it waits to receive the state of a beacon from another wireless terminal that can communicate directly between the own radio terminal, upon receiving the beacon in the period, by the radio transmission circuit of its own radio terminal into operation, wherein A transmission request transmission means for transmitting a transmission request to the other wireless terminal that is the transmission source of the beacon;
A reception confirmation signal receiving means for receiving a reception confirmation signal from the other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the transmission start time and the time correction information are transmitted to the other wireless terminal that is the transmission partner of the reception confirmation signal. A data transmission means for transmitting data including the elapsed time from the time of occurrence of the transmission event to the time of data transmission; and
A data confirmation signal receiving means for receiving a data confirmation signal transmitted from the other wireless terminal which is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal in an operating state after data transmission by the data transmission means; It is made to function as.

A program to be executed by a computer that controls a wireless terminal serving as a relay device according to the present invention includes a plurality of wireless devices including a wireless transmission circuit that transmits data wirelessly and a wireless reception circuit that receives data transmitted wirelessly. in a wireless communication network system configured by end end, comprising a wireless terminal which is one of the collecting device, and a wireless terminal comprising a plurality of relay devices located downstream communication path from the wireless terminal as the the collection device A computer of the wireless terminal serving as a relay device in a wireless communication network system,
Intermittently at a fixed period, and the wireless transmission circuit of the radio terminal to the operating state transmitting the beacon, in the operating state the radio receiving circuit of the radio terminal after transmitting the beacon, from the radio terminal Intermittent operation control means for receiving a transmission request transmitted from a first other wireless terminal that is located above the downlink communication path and can communicate directly with the own wireless terminal ,
A transmission request receiving means for receiving a transmission request transmitted from the first other wireless terminal during an operation state of the wireless reception circuit of the own wireless terminal ;
A reception confirmation signal transmission means for transmitting a reception confirmation signal to the first other wireless terminal by setting the wireless transmission circuit of its own wireless terminal in an operating state when the transmission request receiving means receives the transmission request;
When the reception confirmation signal is transmitted, the wireless reception circuit of the own wireless terminal is put into an operation state, and the transmission correction time includes the transmission start time and the elapsed time from the occurrence of the transmission event to the data transmission time. Data receiving means for receiving data from the first other wireless terminal ;
Time correction means for correcting the time of the own wireless terminal based on the time correction information when the data is received;
When the data is received, a relay time measuring unit that starts a relay time measurement timer of the own wireless terminal to relay the data and measures a relay time in the own wireless terminal;
When receiving the data, the self above with the wireless receiver circuit to an operation state of the wireless terminal, a second possible direct communication between a position to and the radio terminal to the lower of the downlink communication path than the radio terminal other waits to receive the state of the beacon from the radio terminal, when receiving the beacon in the period, the radio terminal said by the radio transmission circuit to an operation state of said second other said a beacon source A transmission request transmission means for transmitting a transmission request to the wireless terminal of
A reception confirmation signal receiving means for receiving a reception confirmation signal from the second other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the second other wireless terminal that is the transmission partner of the reception confirmation signal is used as the time correction information . time when the transmission start time the wireless terminal set to a collecting device from the reception time of the data received the data and the elapsed time until the data transmission time for the second other wireless terminal which is the source of the beacon A data transmission means for transmitting data including an elapsed time obtained by adding the elapsed time of
A data confirmation signal for receiving a data confirmation signal transmitted from the second other wireless terminal that is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal to an operating state after data transmission by the data transmission means It is made to function as a receiving means.

  According to the present invention, time correction information is added in downlink communication of a collection device in a wireless communication network system including a wireless terminal serving as one collection device and wireless terminals serving as a plurality of relay devices. Since each terminal only corrects the time based on the correction information, the configuration of time synchronization in the wireless communication network system can be simplified.

  In addition, since the collecting apparatus of the present invention does not need to perform time correction processing as in the prior art, the configuration of the collecting apparatus can be simplified.

It is a figure which shows the structural example of the 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 which shows the packet transmission sequence of the collection apparatus which concerns on embodiment of this invention. It is a figure which shows the example of a downlink communication packet format which concerns on embodiment of this invention. It is a figure which shows the processing flow of the collection apparatus concerning embodiment of this invention. It is a figure which shows the relay sequence of the downlink communication packet concerning embodiment of this invention. It is a figure which shows the processing flow (the 1) of the relay terminal which concerns on embodiment of this invention. It is a figure which shows the processing flow (the 2) of the relay terminal 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 wireless communication network system according to an embodiment of the present invention. In FIG. 1, the wireless communication network system according to the embodiment of the present invention, for example, creates in advance network configuration information for each terminal A to F configuring a mesh to relay a packet to a target terminal and holds the network configuration information in each terminal. Suppose you are. That is,
FIG. 1A shows a wireless communication network system in which terminals A to F are arranged in a mesh shape. The solid line shown in the figure indicates that the terminals can directly communicate with each other by radio, and the terminals that are not connected to the solid line can perform communication by relaying other terminals. The wireless communication network system according to the embodiment of the present invention shown in FIG. 1 (a) is very effective in configuring a wireless monitoring control device because it does not select a use environment.

  Each terminal constituting the wireless communication network system according to the embodiment of the present invention shown in FIG. 1A can be connected to an instrument such as a sensor, a personal computer, a host device (not shown), etc. via an interface (described later). The information taken from the measuring instrument such as the sensor related to its own terminal is transmitted to the target terminal while relaying the other terminals arranged in a mesh form in response to a request from the other terminal based on a predetermined communication sequence. To do.

Each terminal grasps its own location in the network topology by exchanging known presence confirmation packets (not shown) with each other, and exchanges the location information exchanged with each other before the start of communication. ) And (c) are stored in the configuration information table. 1 (b) is intended showing an example of the content of the terminal A own configuration information table grasped by exchanging the existence confirmation packet (not shown) to each other as described above, and FIG. 1 (c) FIG. 4 shows an example of the contents of the configuration information table of other adjacent terminals B, C, and D recognized by the terminal A. FIG. Note that the configuration information table itself is already known, and further explanation is omitted.

FIG. 2 is a functional block diagram showing the configuration of the wireless terminal according to the embodiment of the present invention. As shown in FIG. 2, a wireless terminal 11 according to an embodiment of the present invention includes a control unit 12 that controls transmission / reception of information, a wireless transmission circuit 14 that transmits information wirelessly, and a wireless unit 13. Wireless receiving circuit 15 for receiving information transmitted wirelessly, switching unit 16 for switching information transmission / reception, antenna 17 for sending and receiving information as a radio wave to space, control unit 12 and wireless unit 13 and intermittent operation A DC power source (eg, battery) 18 for supplying power to the control unit 20, an interface 19 for exchanging information with a host device (not shown), and a timer (not shown) are provided, and the control unit 12 and the radio unit 13 have a predetermined cycle. Is provided with an intermittent operation control unit 20 that sends an operation signal to operate the control unit 12 and the wireless unit 13 intermittently.

  Note that examples of the host device that exchanges information via the interface 19 include an information processing device such as a personal computer, a switch, a sensor, and a display that constitute an instrumentation device.

Further, the control unit 12 is provided with a packet transmission / reception control unit 32 having a built-in memory 33, a data transmission unit 34, a data reception unit 36, and a sequence control unit 35.
Here, the packet transmission / reception control unit 32 reads packet data (for example, measurement data, relay data, etc.) stored in the memory 33 and passes the packet data to the data transmission unit 34 and stores the packet received by the data reception unit 36 in the memory 33. Control. The sequence control unit 35 performs transmission and reception of packets and switching control of the switching unit 16. The sequence control unit 35 exchanges control signals with the packet transmission / reception control unit 32 as appropriate, and executes transmission and reception of packets in a predetermined sequence.

  Various control signals used in the communication sequence of the wireless terminal according to the embodiment of the present invention, for example, synchronization beacon (RNO), transmission request signal (SREQ), reception confirmation signal (RACK), and data reception confirmation signal (DACK) are The packet transmission / reception control unit 32 creates and exchanges data between the transmission / reception wireless terminals under the control of the sequence control unit 35. A specific communication sequence will be described later.

  The packet transmission / reception control unit 32 creates a synchronization beacon (RNO), and the synchronization beacon (RNO) is transmitted through the wireless transmission circuit 14 at regular intervals under the control of the intermittent operation control unit 20 and the sequence control unit 35. To send.

  The sequence control unit 35 receives control signals necessary for a series of sequences related to packet transmission / reception, that is, a transmission request signal (SREQ), a reception confirmation signal (RACK), and a data reception confirmation signal (DACK) for data (DATA) transmission. Involved in transmission / reception of each format data, transmission / reception is performed via the wireless transmission circuit 14 and the wireless reception circuit 15. At this time, the reception confirmation signal (RACK) of the transmission request signal (SREQ) received by the wireless reception circuit 15 and the data reception confirmation signal (DACK) of data (DATA) are appropriately transmitted to the packet transmission / reception control unit 32.

  The intermittent operation control unit 20, the packet transmission / reception control unit 32, and the sequence control unit 35 are configured to include, for example, a CPU / MPU, and the CPU / MPU executes a predetermined application program stored in advance in a memory or the like. Thus, predetermined control is performed. In particular, the memory 33 in the packet transmission / reception control unit 32 also stores configuration information and the like shown in FIGS. 1 (b) and 1 (c). Further, in the memory 33, a terminal identification ID (wireless terminal identifier) arbitrarily assigned to the own terminal is registered and stored in advance (for example, in initial registration work at the time of installation).

  FIG. 3 is a diagram showing a packet transmission sequence of the collection device according to the embodiment of the present invention. In the wireless communication network system according to the embodiment of the present invention shown in FIG. 1, only the terminals A to F are described, which clearly indicates which terminal is a “collection device (also called a totaling terminal)”. However, one of the plurality of terminals is set as the “collection device”.

  In FIG. 3, when a transmission request is generated (also referred to as a transmission event), the collection device (TMx) displays a transmission start time (Tstart) unit 141 in the time information 140 of the header unit 110 shown in the downlink communication packet format of FIG. The current time held by itself is set to 0 (zero) in the relay time (Ttrans) unit 142, respectively, and a transition is made to waiting for synchronization (waiting for receiving a synchronization beacon). Simultaneously with the shift to synchronization waiting, measurement by a relay time measuring timer (not shown) is started. As described above, the control unit 12 shown in FIG. 2 includes a CPU / MPU, a memory, and the like, and the timer can be realized as a “soft timer”.

  Here, the downlink communication packet format of FIG. 4 will be further described. The format of the downlink communication packet is divided into a header part 110 and a data part 120, and the header part 110 is further divided into destination information 130 and time information 140. ing.

  The time information 140 in the header part 110 includes a transmission start time (Tstart) part 141 and a relay time (Ttrans) part 142. The transmission start time (Tstart) part 141 sets the time of the own terminal by the collection device. The relay time (Ttrans) unit 142 represents an information area for accumulating the time required for each relay terminal to transmit to other terminals. The data portion 120 in the downlink communication packet format is provided as a transmission data portion 150 as an information area representing the content of data to be transmitted.

  Note that the “transmission request” in this embodiment is a time correction command issued by the collection device if it is a collection device, a transmission command from a higher-level device if it is a relay terminal, as illustrated in FIG. 3 or FIG. A transmission request is raised by a relay command or the like when receiving relay information transmitted from the terminal (a transmission event occurs).

  Returning to FIG. 3, if the wireless communication network system according to the embodiment of the present invention is, for example, a sensor network, an RNO (synchronization beacon) is transmitted from a transmission terminal (TMa) that transmits measurement data to a higher-level collection device. The higher-level collection device receives it. Note that the terminal (TMa) illustrated in FIG. 3 does not indicate the terminal A illustrated in FIG.

  Upon receiving RNO (synchronization beacon), in response to this, the collection device (TMx) transmits a transmission request signal (SREQ) to the terminal (TMa). When receiving this, the transmitting terminal (TMa) transmits a reception confirmation signal (RACK) to the collecting device (TMx), and thus the collecting device (TMx) receives it. In response to this, the collection device (TMx) transmits data (DATA) to the transmission terminal (TMa). At this time, the collection device (TMx) updates the relay time (Ttrans) part 142 of the header part 110 to “Ttrans + Tx” and transmits it. When the transmission terminal (TMa) receives the data (DATA) indicated in the packet for downlink communication in which the relay time (Ttrans) unit 142 is updated, the transmission terminal (TMa) transmits a data reception confirmation signal (DACK), A series of communication sequences is completed.

Here, the time correction function based on the collection device will be described. As described above, the collection device transmits the downlink communication packet after setting predetermined time information in the transmission start time (Tstart) unit 141 and the relay time (Ttrans) unit 142 of the time information 140 in the format shown in FIG. To do. All the terminals that have received this downlink communication packet have their time set to “Tstart” set in the transmission start time (Tstart) unit 141 set by the collection device, and time information 140 in the format shown in FIG. The time set in the relay time (Ttrans) section 142 of the mobile station is changed to a time obtained by adding the time when the downlink communication packet is added to the relay time required for the relay terminal of the wireless communication network to relay. This operation is performed not only on the destination terminal related to the communication sequence with the collection apparatus but also on all the relay terminals involved in the relay. As a result, each terminal can perform measurement at the time determined at the same time, and the measured information can be transmitted to a higher-level collection device by upstream communication.

  As described above, in the wireless communication network system of the present invention, each terminal that has received the time correction information added to the downlink communication adds the time correction information in the downlink communication from the higher-level collection device, so that the time of its own terminal Is corrected using the time correction information, and measurement is performed at a time determined by all terminals based on the corrected time, and the measured data is transmitted to a higher-level collection device by upstream communication. .

FIG. 5 is a diagram illustrating a processing flow of the collection device according to the embodiment of the present invention. 5, the collection apparatus, in step S51, creates a downlink communication packet, the downlink communication packet format shown in FIG. 4, it stores the information of a packet to be transmitted. That is, the data destination is stored in the destination information 130 of FIG. 4, the current time is stored in the transmission start time (Tstart) unit 141, 0 (zero) is stored in the relay time (Ttrans) unit 142, and the transmission data unit to 150, to store the data that you want to send.

Next, in step S52, wireless reception is started. That is, it waits for reception of a synchronization beacon and waits for a synchronization beacon (RNO) to be sent.
In step S53, measurement by a relay time measuring timer (not shown) is started.

  Next, in step S54, it is determined whether an RNO (synchronization beacon) has been received. Loop until RNO is received. If received, the process proceeds to step S55. In step S55, a transmission request signal (SREQ) is transmitted.

Next, in step S56, it is determined whether RACK (reception confirmation signal) has been received. Loop until RACK is received. If received, the process proceeds to step S57.
In step S57, the downlink communication packet is edited, and the relay time measurement timer (not shown) measures the relay time (Ttrans) part 142 in the time information 140 of the header part 110 from the initial “0 (zero)”. Update the value to “Ta”.

In step S58, the data is transmitted as a DATA packet in which transmission data is stored in the data portion 120 of the downlink communication packet shown in FIG.
Note that the downlink communication packet in FIG. 4 corresponds to data (DATA) in a control signal used for a sequence of wireless terminals communicating with other wireless terminals, and FIG. 4 shows a synchronization beacon (RNO). Various formats of the transmission request signal (SREQ), the reception confirmation signal (RACK), and the data reception confirmation signal (DACK) are omitted.

  Next, in step S59, it is determined whether DACK (data reception confirmation signal) has been received. Loop until DACK is received. If received, the collection device enters a standby state.

  FIG. 6 is a diagram showing a relay sequence of downlink communication packets according to the embodiment of the present invention. In FIG. 6, as an example, a description will be given assuming that the terminal (TMa), the terminal (TMb), and the terminal (TMc) are terminals involved in the relay operation of the downlink communication packet. Note that the terminals (TMa), (TMb), and (TMc) shown in FIG. 6 do not refer to the terminals A, B, and C shown in FIG.

  In FIG. 6, when a transmission request is generated, the relay terminal (TMa) waits for synchronization (waits for reception of a synchronization beacon) and starts measurement by a relay time measuring timer (not shown), thereby repeating the relay terminal (TMa). The relay waiting time is counted at the start of the timer measurement. On the other hand, the relay terminal (TMb) transmits a synchronization beacon (RNO) when the standby time has elapsed based on the time schedule of the terminal itself.

  When the relay terminal (TMa) receives the synchronization beacon (RNO) transmitted by the relay terminal (TMb), the transmission request signal (SREQ) is transmitted to the relay terminal (TMb). When the relay terminal (TMb) receives the transmission request signal (SREQ), the relay terminal (TMb) transmits RACK (reception confirmation signal) to the relay terminal (TMa). When receiving the RACK (reception confirmation signal), the relay terminal (TMa) transmits data (DATA) to the relay terminal (TMb). At the time of transmission of this data (DATA), the relay terminal (TMa) indicates the relay waiting time (Ta) counted by the relay time measuring timer (not shown) in the header 110 shown in the downlink communication packet format shown in FIG. The relay time (Ttrans) unit 142 is updated to “Ttrans + Ta”, and is transmitted as a relay packet included in the downlink communication packet format shown in FIG.

Relay terminal (TMb) is when receiving a downlink communication packet shown in FIG. 4 as a relay packet, the relay time (Ttrans) 142 of the header section 110 shown in downlink communication packet format relay terminal shown in FIG. 4 ( TMa) is updated to the relay time (Ttrans + Ta), so that the time of its own terminal is set to the “reception packet transmission start time + relay time” of the received downlink communication packet shown in FIG. 4 is edited based on the information stored in the transmission start time (Tstart) part 141 and the relay time (Ttrans) part 142 in the time information 140 of the header part 110 shown in the downlink communication packet format 4. The time is corrected to “transmission start time + relay time”. Then, the relay terminal (TMb) starts a packet relay operation for the terminal (TMc). Before starting the relay operation, the relay terminal (TMb) transmits a DACK (data reception confirmation signal) to the relay terminal (TMa).

  Next, when the relay terminal (TMb) corrects the time of its own terminal, the relay terminal (TMb) starts measuring the relay waiting time at the relay terminal (TMb) by starting measurement by its relay time measuring timer (not shown). Count by. When the relay terminal (TMb) transmits DACK (data reception confirmation signal) to the relay terminal (TMa), the relay terminal (TMb) waits for synchronization (waits for reception of synchronization beacons).

  On the other hand, the relay terminal (TMc) transmits a synchronization beacon (RNO) to the relay terminal (TMb) when the standby time has elapsed based on the time schedule of the terminal itself. When the relay terminal (TMb) receives the synchronization beacon (RNO) from the relay terminal (TMc), the relay terminal (TMb) transmits a transmission request signal (SREQ) to the relay terminal (TMc).

  When the relay terminal (TMc) receives the transmission request signal (SREQ), the relay terminal (TMc) transmits RACK (reception confirmation signal) to the relay terminal (TMb). When receiving the RACK (reception confirmation signal), the relay terminal (TMb) transmits data (DATA) to the relay terminal (TMc). At this time, the relay terminal (TMb) sets the relay waiting time (Tb) measured by the relay time measuring timer (not shown) to the relay time (Ttrans) unit 142 of the header unit 110 shown in the downlink communication packet format of FIG. Update to Ttrans + Tb ", and transmit as a relay packet included in the downlink communication packet format shown in FIG. When receiving the data (DATA) from the relay terminal (TMb), the relay terminal (TMc) transmits DACK (data reception confirmation signal) to the relay terminal (TMb) and enters a standby state.

  As described above, the relay waiting time (= relay time) measured by the relay terminal is added to the relay time (Ttrans) portion 142 of the header portion 110 shown in the downlink communication packet format of FIG. Considering the above, it becomes possible to measure the measurement data at a timing at which the terminals can measure at the same time all at once.

  7A and 7B are diagrams showing a processing flow of the relay terminal according to the embodiment of the present invention. Referring to FIG. 6 in order from FIG. 7A, in FIG. 7A, in step S61, the relay terminal (TMb) monitors whether the standby time has elapsed based on the time schedule of its own terminal. In step S62, a synchronization beacon (RNO) is transmitted.

  In step S63, the relay terminal (TMb) monitors whether a transmission request signal (SREQ) has been received. When the transmission request signal (SREQ) is received, a reception confirmation signal (RACK) is transmitted in step S64.

  Next, in step S65, the relay terminal (TMb) continues monitoring until it receives data (DATA) indicating the relay packet. When data (DATA) is received, the relay terminal (TMb) receives the data (DATA) in step S66. With reference to the downlink communication packet format shown in FIG. 4 which is the content, a value obtained by adding the relay time (= relay waiting time) to the transmission start time of the packet having received the own terminal time is set. In step S67, the relay terminal (TMb) starts measurement by a relay time measuring timer (not shown). Thereafter, in step S68, a data reception confirmation signal (DACK) is transmitted to the relay terminal (TMa).

  Turning now to FIG. 7B, in step S69, the relay terminal (TMb) starts wireless reception. That is, it waits for a synchronization beacon (RNO) reception and waits for a synchronization beacon to be sent. In step S70, the relay terminal (TMb) monitors reception of the synchronization beacon (RNO) from the relay terminal (TMc).

  When the synchronization beacon (RNO) is received, the relay terminal (TMb) transmits a transmission request signal (SREQ) in step S71. In step S72, reception of a reception confirmation signal (RACK) from the relay terminal (TMc) is monitored.

  When the relay terminal (TMb) receives the reception confirmation signal (RACK) in step S72, the process proceeds to step S73, and in step S73, the relay terminal (TMb) edits the downlink communication packet. Here, the editing of the packet for downlink communication is performed by adding the timer value measured by the timer for measuring the relay time of the relay terminal (TMb) to the value of the relay time (Ttrans) unit 142 in the downlink communication packet format shown in FIG. It is to be.

  In step S74, the relay terminal (TMb) transmits the relay packet received from the relay terminal (TMa) to the relay terminal (TMc) as data (DATA). In step S75, the reception of the data reception confirmation signal (DACK) is monitored, and if it can be received, a series of relay operations is completed by shifting to a standby state.

As described above, each relay terminal can deliver data (DATA) to the target terminal by relaying to the target terminal in the same manner as described above while updating the relay time.
And after delivering the data (DATA) with time correction information added to all terminals, each terminal corrects the time of its own terminal based on the time correction information, and after a predetermined time based on the measurement cycle, For example, after 30 minutes, the data sensed by each terminal at the same time is included in the upstream communication packet and sent to the collection device, so the collection device can collect the data sensed by all terminals at the same time It becomes. That is, it is not necessary for the conventional collecting device to correct the time of the data transmitted from each terminal, and the data sensed by the collecting device at the same time can be collected accurately.

DESCRIPTION OF SYMBOLS 11 Wireless terminal 12 Control part 13 Wireless part 14 Wireless transmission circuit 15 Wireless reception circuit 16 Switching part 17 Antenna 18 DC power supply 19 Interface 20 Intermittent operation control part 32 Packet transmission / reception control part 33 Memory 34 Data transmission part 35 Sequence control part 36 Data reception Unit 110 header unit 120 data unit 130 destination information 140 time information 141 transmission start time (Tstart) unit 142 relay time (Ttrans) unit 150 transmission data unit

Claims (7)

A wireless transmission circuit for transmitting the data wirelessly, in a wireless communication network system including a plurality of wireless end end and a radio receiving circuit for receiving data transmitted by radio, the wireless communication network system may include one includes a wireless terminal as the One collection device, and a wireless terminal comprising a plurality of relay devices located downstream communication path from the wireless terminal as the the collection device,
The wireless terminal serving as a collection device is:
When the transmission event for adding the time correction information to downlink communication packet is generated, the predetermined time period, and the radio receiving circuit of the radio terminal into operation, than the radio terminals located in the lower of the downlink communication path and it waits to receive the state of a beacon from another wireless terminal that can communicate directly between the own radio terminal, upon receiving the beacon in the period, by the radio transmission circuit of its own radio terminal into operation, wherein A transmission request transmission means for transmitting a transmission request to the other wireless terminal that is the transmission source of the beacon;
A reception confirmation signal receiving means for receiving a reception confirmation signal from the other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the transmission start time and the time correction information are transmitted to the other wireless terminal that is a transmission partner of the reception confirmation signal. Data transmission means for transmitting data including the elapsed time from the time of occurrence of the transmission event to the time of data transmission;
Data confirmation signal receiving means for receiving a data confirmation signal transmitted from the other wireless terminal that is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal to an operating state after data transmission by the data transmission means; Have
The wireless terminal serving as a relay device is:
Intermittently at a fixed period, and the wireless transmission circuit of the radio terminal to the operating state transmitting the beacon, in the operating state the radio receiving circuit of the radio terminal after transmitting the beacon, from the radio terminal An intermittent operation control means for receiving a transmission request transmitted from a first other wireless terminal located above the downlink communication path and capable of direct communication with the own wireless terminal ;
A transmission request receiving means for receiving a transmission request transmitted from the first other wireless terminal during an operation state of the wireless reception circuit of the own wireless terminal ;
When the transmission request receiving means receives the transmission request, a reception confirmation signal transmitting means for transmitting a reception confirmation signal to the first other wireless terminal by setting the wireless transmission circuit of its own wireless terminal to an operating state;
When the reception confirmation signal is transmitted, the wireless reception circuit of the own wireless terminal is put into an operation state, and the transmission correction time includes the transmission start time and the elapsed time from the occurrence of the transmission event to the data transmission time. Data receiving means for receiving data from the first other wireless terminal ;
Time correction means for correcting the own wireless terminal time based on the time correction information when the data is received;
When the data is received, a relay time measuring unit that starts a relay time measurement timer of the own wireless terminal to relay the data and measures a relay time in the own wireless terminal;
When receiving the data, the self above with the wireless receiver circuit to an operation state of the wireless terminal, a second possible direct communication between a position to and the radio terminal to the lower of the downlink communication path than the radio terminal other waits to receive the state of the beacon from the radio terminal, when receiving the beacon in the period, the self above with a radio transmitter circuit to an operation state of the terminal device, the second other said a beacon source A transmission request transmission means for transmitting a transmission request to the wireless terminal of
A reception confirmation signal receiving means for receiving a reception confirmation signal from the second other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the second other wireless terminal that is the transmission partner of the reception confirmation signal is used as the time correction information . time when the transmission start time the wireless terminal set to a collecting device from the reception time of the data received the data and the elapsed time until the data transmission time for the second other wireless terminal which is the source of the beacon Data transmission means for transmitting data including the elapsed time obtained by adding the elapsed time of
A data confirmation signal for receiving a data confirmation signal transmitted from the second other wireless terminal that is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal to an operating state after data transmission by the data transmission means And a wireless communication network system.   The time correction information is added to a time information field of a header part of a downlink communication packet, and the time information field includes a transmission start time (Tstart) and a relay time (Ttrans) in an area. Item 4. The wireless communication network system according to Item 1. A wireless transmission circuit for transmitting the data wirelessly, in a wireless communication network system including a plurality of wireless end end and a radio receiving circuit for receiving data transmitted by radio, the wireless communication network system may include one a wireless terminal as the One collection device, comprises a wireless terminal comprising a plurality of relay devices located downstream communication path from the wireless terminal as the the collection device,
The wireless terminal serving as a collection device is:
When the transmission event for adding the time correction information to downlink communication packet is generated, the predetermined time period, and the radio receiving circuit of the radio terminal into operation, than the radio terminals located in the lower of the downlink communication path and it waits to receive the state of a beacon from another wireless terminal that can communicate directly between the own radio terminal, upon receiving the beacon in the period, by the radio transmission circuit of its own radio terminal into operation, wherein A transmission request transmission means for transmitting a transmission request to the other wireless terminal that is the transmission source of the beacon;
A reception confirmation signal receiving means for receiving a reception confirmation signal from the other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the transmission start time and the time correction information are transmitted to the other wireless terminal that is the transmission partner of the reception confirmation signal. Data transmission means for transmitting data including the elapsed time from the time of occurrence of the transmission event to the time of data transmission;
Data confirmation signal receiving means for receiving a data confirmation signal transmitted from the other wireless terminal that is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal to an operating state after data transmission by the data transmission means; , A wireless terminal serving as a collection device. A wireless transmission circuit for transmitting the data wirelessly, in a wireless communication network system including a plurality of wireless end end and a radio receiving circuit for receiving data transmitted by radio, the wireless communication network system may include one a wireless terminal as the One collection device, comprises a wireless terminal comprising a plurality of relay devices located downstream communication path from the wireless terminal as the the collection device,
The wireless terminal serving as a relay device is:
Intermittently at a fixed period, the own the radio terminal by the radio transmission circuit in an operating state send a bi bacon, and the operating state of the radio receiving circuit of the radio terminal after transmitting the beacon, from the radio terminal An intermittent operation control means for receiving a transmission request transmitted from a first other wireless terminal located above the downlink communication path and capable of direct communication with the own wireless terminal ;
A transmission request receiving means for receiving a transmission request transmitted from the first other wireless terminal during an operation state of the wireless reception circuit of the own wireless terminal ;
When the transmission request receiving means receives the transmission request, a reception confirmation signal transmitting means for transmitting a reception confirmation signal to the first other wireless terminal by setting the wireless transmission circuit of its own wireless terminal to an operating state;
When the reception confirmation signal is transmitted, the wireless reception circuit of the own wireless terminal is put into an operation state, and the transmission correction time includes the transmission start time and the elapsed time from the occurrence of the transmission event to the data transmission time. Data receiving means for receiving data from the first other wireless terminal ;
Time correction means for correcting the own wireless terminal time based on the time correction information when the data is received;
When the data is received, a relay time measuring unit that starts a relay time measurement timer of the own wireless terminal to relay the data and measures a relay time in the own wireless terminal;
When receiving the data, the self above with the wireless receiver circuit to an operation state of the wireless terminal, a second possible direct communication between a position to and the radio terminal to the lower of the downlink communication path than the radio terminal other waits to receive the state of the beacon from the radio terminal, when receiving the beacon in the period, the radio terminal said by the radio transmission circuit to an operation state of said second other said a beacon source A transmission request transmission means for transmitting a transmission request to the wireless terminal of
A reception confirmation signal receiving means for receiving a reception confirmation signal from the second other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the second other wireless terminal that is the transmission partner of the reception confirmation signal is used as the time correction information . time when the transmission start time the wireless terminal set to a collecting device from the reception time of the data received the data and the elapsed time until the data transmission time for the second other wireless terminal which is the source of the beacon Data transmission means for transmitting data including the elapsed time obtained by adding the elapsed time of
A data confirmation signal for receiving a data confirmation signal transmitted from the second other wireless terminal that is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal to an operating state after data transmission by the data transmission means A wireless terminal serving as a relay device. A wireless transmission circuit for transmitting the data wirelessly, in a wireless communication network system including a plurality of wireless end end and a radio receiving circuit for receiving data transmitted by radio, the radio terminal as the single collecting device When, a time correction method in a wireless communication network system comprising a wireless terminal comprising a plurality of relay devices located downstream communication path from the wireless terminal as the the collection device,
The wireless terminal serving as a collection device is:
When the transmission event for adding the time correction information to downlink communication packet is generated, the predetermined time period, and the radio receiving circuit of the radio terminal into operation, than the radio terminals located in the lower of the downlink communication path and it waits to receive the state of a beacon from another wireless terminal that can communicate directly between the own radio terminal, upon receiving the beacon in the period, by the radio transmission circuit of its own radio terminal into operation, wherein Send a transmission request to the other wireless terminal that is the source of the beacon,
Receiving the reception confirmation signal from the other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the transmission start time and the time correction information are transmitted to the other wireless terminal that is a transmission partner of the reception confirmation signal. Send data containing the elapsed time from the time of the transmission event to the time of data transmission,
After the data transmission, the wireless reception circuit of its own wireless terminal is put into an operating state, and a data confirmation signal transmitted from the other wireless terminal that is the transmission partner of the data is received,
On the other hand, the wireless terminal as a relay device is
Intermittently at a fixed period, and the wireless transmission circuit of the radio terminal to the operating state transmitting the beacon, in the operating state the radio receiving circuit of the radio terminal after transmitting the beacon, from the radio terminal Also receives a transmission request transmitted from the first other wireless terminal located above the downlink communication path and capable of direct communication with the own wireless terminal ,
When the transmission request is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and a reception confirmation signal is transmitted to the first other wireless terminal,
When the reception confirmation signal is transmitted, the wireless reception circuit of the own wireless terminal is put into an operation state, and the transmission correction time includes the transmission start time and the elapsed time from the occurrence of the transmission event to the data transmission time. Receiving data from the first other wireless terminal ;
When receiving the data, measures a relay time in the radio terminal is allowed to the radio terminal starts a relay time measurement timer for relaying the data is corrected on the basis of the own wireless terminal time with the time correction information and, when further receiving the data, the self above with the wireless receiver circuit to an operation state of the wireless terminal, capable of communicating directly between the position and and its own radio terminal to the lower of the downlink communication path than the radio terminal second waits to receive the state of the beacon from another wireless terminal such, upon receiving the beacon in the period, by the radio transmission circuit of its own radio terminal into operation, wherein the said is a beacon of sender sends a transmission request to the two other wireless terminals, receiving an acknowledgment signal from said second other wireless terminal which is the source of the beacon,
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the second other wireless terminal that is the transmission partner of the reception confirmation signal is used as the time correction information . time when the transmission start time the wireless terminal set to a collecting device from the reception time of the data received the data and the elapsed time until the data transmission time for the second other wireless terminal which is the source of the beacon Send the data containing the elapsed time that is added to the elapsed time of
A time correction method for receiving a data confirmation signal transmitted from the second other wireless terminal that is a transmission partner of the data by setting the wireless reception circuit of the own wireless terminal to an operating state after the data transmission. A wireless transmission circuit for transmitting the data wirelessly, in a wireless communication network system including a plurality of wireless end end and a radio receiving circuit for receiving data transmitted by radio, the radio terminal as the single collecting device And a computer of the wireless terminal that is a collection device in a wireless communication network system including a plurality of wireless terminals that are relay devices located in a downlink communication path from the wireless terminal that is the collection device,
When the transmission event for adding the time correction information to downlink communication packet is generated, the predetermined time period, and the radio receiving circuit of the radio terminal into operation, than the radio terminals located in the lower of the downlink communication path and it waits to receive the state of a beacon from another wireless terminal that can communicate directly between the own radio terminal, upon receiving the beacon in the period, by the radio transmission circuit of its own radio terminal into operation, wherein A transmission request transmission means for transmitting a transmission request to the other wireless terminal that is the transmission source of the beacon;
A reception confirmation signal receiving means for receiving a reception confirmation signal from the other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the transmission start time and the time correction information are transmitted to the other wireless terminal that is the transmission partner of the reception confirmation signal. A data transmission means for transmitting data including the elapsed time from the time of occurrence of the transmission event to the time of data transmission; and
A data confirmation signal receiving means for receiving a data confirmation signal transmitted from the other wireless terminal which is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal in an operating state after data transmission by the data transmission means; Program to function as. A wireless transmission circuit for transmitting the data wirelessly, in a wireless communication network system including a plurality of wireless end end and a radio receiving circuit for receiving data transmitted by radio, the radio terminal as the single collecting device When the computer of the wireless terminal as the relay apparatus in a wireless communication network system comprising a wireless terminal comprising a plurality of relay devices located downstream communication path from the wireless terminal as the the collection device,
Intermittently at a fixed period, and the wireless transmission circuit of the radio terminal to the operating state transmitting the beacon, in the operating state the radio receiving circuit of the radio terminal after transmitting the beacon, from the radio terminal Intermittent operation control means for receiving a transmission request transmitted from a first other wireless terminal that is located above the downlink communication path and can communicate directly with the own wireless terminal ,
A transmission request receiving means for receiving a transmission request transmitted from the first other wireless terminal during an operation state of the wireless reception circuit of the own wireless terminal ;
A reception confirmation signal transmission means for transmitting a reception confirmation signal to the first other wireless terminal by setting the wireless transmission circuit of its own wireless terminal in an operating state when the transmission request receiving means receives the transmission request;
When the reception confirmation signal is transmitted, the wireless reception circuit of the own wireless terminal is put into an operation state, and the transmission correction time includes the transmission start time and the elapsed time from the occurrence of the transmission event to the data transmission time. Data receiving means for receiving data from the first other wireless terminal ;
Time correction means for correcting the time of the own wireless terminal based on the time correction information when the data is received;
When the data is received, a relay time measuring unit that starts a relay time measurement timer of the own wireless terminal to relay the data and measures a relay time in the own wireless terminal;
When receiving the data, the self above with the wireless receiver circuit to an operation state of the wireless terminal, a second possible direct communication between a position to and the radio terminal to the lower of the downlink communication path than the radio terminal other waits to receive the state of the beacon from the radio terminal, when receiving the beacon in the period, the radio terminal said by the radio transmission circuit to an operation state of said second other said a beacon source A transmission request transmission means for transmitting a transmission request to the wireless terminal of
A reception confirmation signal receiving means for receiving a reception confirmation signal from the second other wireless terminal that is the transmission source of the beacon that has received the transmission request;
When the reception confirmation signal is received, the wireless transmission circuit of the own wireless terminal is set in an operating state, and the second other wireless terminal that is the transmission partner of the reception confirmation signal is used as the time correction information . time when the transmission start time the wireless terminal set to a collecting device from the reception time of the data received the data and the elapsed time until the data transmission time for the second other wireless terminal which is the source of the beacon A data transmission means for transmitting data including an elapsed time obtained by adding the elapsed time of
A data confirmation signal for receiving a data confirmation signal transmitted from the second other wireless terminal that is the transmission partner of the data by setting the wireless reception circuit of the own wireless terminal to an operating state after data transmission by the data transmission means A program for functioning as a receiving means.