JP6382046B2 - Broadcast communication system, broadcast communication method, and intermittent operation wireless terminal for wireless communication network - Google Patents

Description

  The present invention provides a wireless communication network broadcast communication system, a broadcast communication method, and a wireless communication network capable of wirelessly communicating with another wireless terminal directly or indirectly via another wireless terminal. The present invention relates to intermittent operation wireless terminals.

  As a network constructed by a plurality of wireless terminals that perform wireless data communication, for example, as shown in Patent Document 1, each wireless terminal is directly connected to another wireless terminal in the network or one or more other wireless terminals. There is known a wireless communication network configured to be able to communicate indirectly through a network. As a method of sharing information between wireless terminals in a so-called multi-hop network configured such that all wireless terminals can communicate with other wireless terminals directly or indirectly, for example, as shown in Patent Document 2 In addition, a broadcast communication technique in which one wireless terminal broadcasts to a wireless terminal capable of direct communication and sequentially transmits communication data is known. Currently, a system using a multi-hop network by wireless terminals is expected to be used for a network system in a building such as a house. By using the above-mentioned broadcast communication function, a wireless terminal with sense is installed in a building. It is considered that a fire alarm system or a crime prevention system equipped with a broadcast function can be realized by arranging a multi-hop network with wireless terminals.

JP 2009-10703 A JP-A-8-139660

  However, when broadcasting, there is a problem that it is not clear at what timing it is optimal for each wireless terminal in the network that operates intermittently to perform broadcast communication.

  Also, when performing broadcast communication with an intermittently operated wireless terminal that operates on a battery, if the time to wait for a synchronization beacon signal for data transfer to an adjacent station becomes longer, the battery will be consumed, and the system will operate. There is a problem that it is difficult.

  Accordingly, an object of the present invention is to realize a broadcast communication regardless of a network form (topology) so that communication data is distributed as quickly as possible to all wireless terminals in the network in a so-called multi-hop network. It is an object to provide a broadcast communication system, a broadcast communication method, and an intermittent operation wireless terminal of a communication network.

In order to achieve the above object, a broadcast communication system of a wireless communication network according to the present invention includes a plurality of intermittent transmissions having a wireless transmission circuit for wirelessly transmitting data and a wireless reception circuit for receiving wirelessly transmitted data. A wireless communication network composed of operating wireless terminals is a broadcast communication system of a wireless communication network constituting a so-called multi-hop network,
The intermittent operation wireless terminal stores the number of logical relays to all wireless terminals in the network in advance in the relay stage number table by mutual prior communication, and the intermittent operation wireless terminal that transmits information becomes a transmission terminal. Information to be transmitted is generated as communication data, a list of wireless terminals to which information is transmitted as untransferred terminal information is added to the communication data, and the own terminal among the wireless terminals to be transmitted with reference to the relay stage number table Communication data transmission control means for selecting the wireless terminal with the largest number of logical relays as the destination and transmitting the communication data;
An intermittently operating wireless terminal that relays the communication data from the transmitting terminal to the destination, captures the communication data in its own terminal, and updates the untransferred terminal information; ,
When the intermittently operating wireless terminal that has updated the untransferred terminal information confirms the relay stage number table of its own terminal and its own terminal becomes a destination adjacent station, it becomes a wireless terminal responsible for simultaneous transfer, and Confirming untransferred terminal information and counting the number of untransferred wireless terminals in the own station, setting a synchronization waiting time proportional to the total number of untransferred terminals, and within the synchronization waiting time within the own station Simultaneous transfer transmission / reception means for performing simultaneous transfer to a wireless terminal in an untransferred state;
The intermittently operating wireless terminal responsible for the simultaneous transfer does not wait for the synchronization waiting time to end without waiting for the synchronization waiting time to end when the simultaneous transfer to all wireless terminals within the station is completed. With reference to the relay stage number table and untransferred terminal information held by the terminal, the self-terminal becomes a new transmission terminal, the intermittent operation wireless terminal having the largest number of logical relays from the self-terminal is set as the destination and the untransferred terminal information When a list of wireless terminals to which information is to be transmitted is added to communication data and transmitted, and the wireless terminal to be simultaneously transferred by the intermittently operating wireless terminal responsible for the simultaneous transfer of the communication data is no longer present in the network Broadcast communication completion means for completing the communication.

In order to achieve the above object, a broadcast communication method for a wireless communication network according to the present invention includes:
A wireless communication network composed of a plurality of intermittently operating wireless terminals having a wireless transmission circuit for wirelessly transmitting data and a wireless reception circuit for receiving wirelessly transmitted data is a wireless that constitutes a so-called multi-hop network. A broadcast communication method for a communication network,
The intermittent operation wireless terminal stores the number of logical relays to all wireless terminals in the network in advance in the relay stage number table by mutual prior communication, and the intermittent operation wireless terminal that transmits information becomes a transmission terminal. Information to be transmitted is generated as communication data, a list of wireless terminals to which information is transmitted as untransferred terminal information is added to the communication data, and the own terminal among the wireless terminals to be transmitted with reference to the relay stage number table Select the wireless terminal with the largest number of logical relays as the destination and send the communication data,
The intermittent operation wireless terminal that relayed in the middle of transmitting the communication data from the calling terminal to the destination captures the communication data in its own terminal, updates the untransferred terminal information,
When the intermittently operating wireless terminal that has updated the untransferred terminal information confirms the relay stage number table of its own terminal and its own terminal becomes a destination adjacent station, it becomes a wireless terminal responsible for simultaneous transfer, and Confirming untransferred terminal information and counting the number of untransferred wireless terminals in the own station, setting a synchronization waiting time proportional to the total number of untransferred terminals, and within the synchronization waiting time within the own station Simultaneous transfer to untransferred wireless terminals,
The intermittently operating wireless terminal responsible for the simultaneous transfer does not wait for the synchronization waiting time to end without waiting for the synchronization waiting time to end when the simultaneous transfer to all wireless terminals within the station is completed. With reference to the relay stage number table and untransferred terminal information held by the terminal, the self-terminal becomes a new transmission terminal, the intermittent operation wireless terminal having the largest number of logical relays from the self-terminal is set as the destination and the untransferred terminal information When a list of wireless terminals to which information is to be transmitted is added to communication data and transmitted, the wireless terminals to be simultaneously transferred by the intermittent operation wireless terminals responsible for the simultaneous transfer of the communication data are no longer present in the communication network. It is characterized by completing the information communication.

In order to achieve the above object, an intermittent operation wireless terminal that performs simultaneous transfer according to the present invention includes a plurality of intermittent operations including a wireless transmission circuit that transmits data wirelessly and a wireless reception circuit that receives data transmitted wirelessly. In a wireless communication network in which a wireless communication network composed of operating wireless terminals constitutes a so-called multi-hop network, a wireless terminal that is one hop ahead of the destination by referring to a destination in communication data transmitted by a transmitting terminal If it is determined that it is a wireless terminal responsible for simultaneous transfer,
The wireless terminal that is responsible for the simultaneous transfer is
A relay stage number table that holds the number of logical relays to all wireless terminals in the network in advance by mutual prior communication;
Simultaneous transfer transmission / reception means for simultaneously transferring the communication data using the wireless transmission circuit and the wireless reception circuit;
Synchronization time control means for controlling synchronization waiting time in simultaneous transfer,
The synchronization time control means refers to the untransferred terminal information of the own terminal held by the own terminal, totals the number of adjacent wireless terminals (having a hop count of 1), and when the total number of unterminals is n The synchronization waiting time Tw is calculated using the following formula:
Tw = T × (n + 1) where T is a synchronous beacon transmission period, and the simultaneous transfer transmission / reception means obtains confirmation that all the wireless terminals of its own station have received the communication data within the synchronization waiting time Tw If the simultaneous transfer ends without waiting for the end of the synchronization waiting time, or if the confirmation that the communication data has been received when the synchronization waiting time Tw ends is not obtained, Even if there is a wireless terminal in the transfer state, the simultaneous transfer ends, and after the simultaneous transfer ends, the own terminal becomes a new transmission terminal, and refers to the relay stage number table and the untransferred terminal information held by the own terminal, Add a list of wireless terminals that want to transmit information as untransferred terminal information to a wireless terminal that has the largest number of logical relays when viewed from its own terminal, and send it to the communication data.
If there are no other untransferred terminals to be simultaneously transferred with reference to the relay stage number table of the own terminal and the untransferred terminal information, it is determined that the broadcast to all the wireless terminals in the wireless communication network has spread. Then, the broadcast communication is terminated.

In order to achieve the above object, a wireless terminal serving as a relay device of the present invention has a plurality of intermittent operations including a wireless transmission circuit that transmits data wirelessly and a wireless reception circuit that receives data transmitted wirelessly Keru Contact the configured wireless communication networks the wireless terminal, wherein a intermittent operation the wireless terminal, each of the intermittent operation the wireless terminal,
It has a relay stage number table that holds the number of logical relays to all wireless terminals in the network in advance by mutual prior communication,
When an event for transmitting information occurs, the terminal becomes a transmitting terminal, generates information to be transmitted as communication data, and stores a list of untransferred wireless terminals to which information is to be transmitted in the communication data. The communication data is selected by adding the wireless terminal with the largest number of logical relays from its own terminal as the destination among the untransferred wireless terminals to be transmitted with reference to the relay stage number table added as forwarding terminal information Send
When communication data is transmitted from another terminal, and the own terminal is not the destination of the communication data and is not an adjacent station of the destination, it becomes a wireless terminal responsible for relaying and transmits the communication data. The untransferred terminal information that has been captured and added to the communication data is updated so as to be transferred for the own terminal, and then the updated untransferred terminal information is added to the communication data for the next transfer. Send it to the destination
When communication data is transmitted from another terminal, and the own terminal is an adjacent station of the destination of the communication data, it becomes a wireless terminal responsible for simultaneous transfer and has been added to the communication data Check the untransferred terminal information, total the number of radio terminals in the untransferred state among the radio terminals adjacent to the own terminal, and set a synchronization waiting time proportional to the total number of radio terminals in the untransferred state, Simultaneously transferring the communication data to the untransferred wireless terminal within the synchronization waiting time,
When the simultaneous transfer is completed, the own terminal becomes a new transmitting terminal, and the number of logical relays from the own terminal is the largest with reference to the relay stage number table and the untransferred terminal information of the own terminal. The wireless terminal in the untransferred state becomes the destination, and the untransferred terminal information is updated to be transferred for the own terminal, and the updated untransferred terminal information is added to the communication data. It is characterized by sending .

  According to the present invention, in a so-called multi-hop network, communication data to be broadcast to all wireless terminals in the network can be transmitted without being affected by the network topology and without changing the communication performance while suppressing battery consumption. It can be distributed as quickly as possible.

  According to the present invention, the intermittent operation wireless terminal in the wireless communication network broadcasts the communication data to all the wireless terminals in the wireless communication network by repeating the relay and simultaneous transfer. Can be completed as soon as possible (confirmation of transmission of communication data).

It is a figure which shows the structural example of the radio | wireless communication network which concerns on embodiment of this invention. It is a block diagram which shows the structure of the intermittent operation radio | wireless terminal which concerns on embodiment of this invention. It is a figure which shows an example of the radio | wireless communication network with which the broadcast communication which concerns on embodiment of this invention is implemented. FIG. 4 is a diagram illustrating a relay stage number table of a transmitting terminal and a list of untransferred terminal information in the wireless communication network illustrated in FIG. 3. It is a figure which shows the packet format example of the communication data transmitted / received by the intermittent operation radio | wireless terminal which concerns on embodiment of this invention. It is a figure explaining transmission / reception of the communication data by the intermittent operation radio | wireless terminal in the radio | wireless communication network shown in FIG. FIG. 7 is a diagram showing a relay stage number table of wireless terminals that perform simultaneous transfer in the wireless communication network shown in FIG. 6 and a list of updated untransferred terminal information. It is a figure which shows the example of a sequence at the time of the simultaneous transfer success based on embodiment of this invention. It is a figure which shows the example of a sequence at the time of the simultaneous transfer failure concerning embodiment of this invention. It is a figure explaining the flow of communication data until the broadcast communication in the radio | wireless communication network which concerns on embodiment of this invention is completed.

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 according to an embodiment of the present invention. In FIG. 1, “X” connects the intermittent operation wireless terminal X according to the embodiment of the present invention, “S” connects the sensor S electrically connected to the intermittent operation wireless terminal X, and the intermittent operation wireless terminal X. The thin solid line indicates that the connected wireless terminals X can directly perform wireless communication.

  As shown in FIG. 1, a wireless communication network according to an embodiment of the present invention is connected to a plurality of wireless terminals X so as to be able to communicate with each other by wireless communication, and constitutes a so-called multi-hop wireless communication network N. The intermittently operating wireless terminal X is configured to be able to communicate directly with another wireless terminal X that is the destination of communication data to be transmitted, or indirectly with another wireless terminal X via another wireless terminal X. With such a configuration, the wireless communication network of the present invention can transmit / receive communication data directly or indirectly to all the wireless terminals X in the wireless communication network N.

  In the present embodiment, some intermittently operating wireless terminals X in the wireless communication network N are connected to various sensors S and configured to be able to acquire information detected by the connected sensors S. As the sensor S, for example, a fire alarm or a security sensor (a heat sensor or an impact sensor for detecting an intruder) can be used. Specifically, for example, when the sensor S is a fire alarm, the wireless terminal X connected to the sensor S broadcasts the information when one wireless terminal X acquires information from the sensor S. The information acquired from the sensor S can be shared by all wireless terminals by transmitting the communication data to be transmitted to all the wireless terminals X in the wireless communication network N.

The network form (topology) shown in FIG. 1 is merely an example, and it is needless to say that the network form (topology) is not limited to the wireless communication network topology shown in FIG.
[Overview of wireless terminal]
FIG. 2 is a block diagram showing a configuration of the intermittent operation wireless terminal according to the embodiment of the present invention. In FIG. 2, the intermittent operation wireless terminal X according to the embodiment of the present invention is roughly composed of a control unit 1 including an arithmetic device and a storage device, and a wireless unit 2 that transmits and receives communication data wirelessly. . The control unit 1 and the radio unit 2 are configured to operate with power supplied from a battery (battery) B. The battery B is connected to the control unit 1 and the wireless unit 2 via the intermittent operation control unit 3, and is configured to operate the control unit 1 and the wireless unit 2 intermittently by the intermittent operation control unit 3. That is,
The intermittent operation control unit 3 reduces the power supply from the battery B to the control unit 1 and the radio unit 2, for example, to such an extent that it can shift to the sleep state every predetermined time, or until the communication data is received. The operation of the wireless terminal X is made intermittent so that the operation can be reduced to such an extent that it can be transferred to. With such a configuration, the power consumption of the intermittent operation wireless terminal X of the present invention can be kept low, and the battery B can be operated for a long time.

In addition, the intermittent operation wireless terminal X of the present invention uses the control unit 1 and the wireless unit 2 and is configured to execute two types of methods of “simultaneous transfer” and “relay” as communication data transfer methods.
In the conventional method, “simultaneous transfer” in the intermittent operation wireless terminal is a state in which the wireless terminal is in a reception state for a specified time, waits for a synchronization signal from an adjacent station, receives the synchronization signal, and sends information to the synchronized wireless terminal. This refers to a communication method for transferring and updating untransferred terminal information. In the “simultaneous transfer” in the present invention, a predetermined synchronization signal determined in proportion to the number of adjacent terminals (the number of logical relays is 1). Refers to a communication method in which communication data is transferred to all adjacent wireless terminals X within the same waiting time (same as beacon signal), and “broadcast communication” according to the present invention is completed as soon as possible (communication data transmitted) Confirmation).

“Relay” is a method of transmitting communication data received by one wireless terminal X to another wireless terminal X in the network N shown in FIG. And in the present embodiment, communication data intermittent operation the wireless terminal X to interact will be exchanged in the packet format shown in FIG. Hereinafter, the control unit 1 and the wireless unit 2 will be described in more detail.

  The control unit 1 includes a packet transmission / reception control device 10, a synchronization time control unit 100, a simultaneous transfer transmission / reception device 11, a relay packet transmission / reception device 12, and a relay stage number table 13. These devices (10 to 13) are all implemented as software that is executed using an arithmetic device and a storage device that constitute the control unit 1. In FIG. 2, the flow of control signals to the constituent devices of the control unit 1 and the radio unit 2 is omitted.

  The wireless unit 2 is configured to mutually convert communication data handled by the control unit 1 and a signal transmitted by wireless communication so that wireless communication with another wireless terminal X is possible. In the present embodiment, the intermittent operation wireless terminal X is configured to perform wireless communication by battery-driven short-range wireless communication. An antenna 5 is connected to the wireless unit 2 and transmits a signal to another wireless terminal X and receives a signal from the other wireless terminal X.

  In the present embodiment, the wireless transmission circuit 21 modulates the communication data processed by the control unit 1 and transmits it wirelessly to the wireless terminal X that is the destination. The wireless reception circuit 22 receives the signal received from the wireless terminal X and demodulates the communication data that can be processed by the control unit 1. The switching unit 23 performs transmission / reception switching by a control signal (not shown) from the control unit 1.

  FIG. 3 is a diagram illustrating an example of a wireless communication network in which broadcast communication according to the embodiment of the present invention is performed. In FIG. 3, X1 to X15 indicate intermittent operation wireless terminals X to which terminal numbers 1 to 15 are assigned. A wireless terminal X1 (sending terminal) indicated by a circle with diagonal stripes in the figure is an intermittent operation wireless terminal X that is a source of transmission of communication data toward a specific wireless terminal X that is a destination. 4 is a diagram showing a list of the relay stage number table (FIG. 4A) and untransferred terminal information (FIG. 4B) of the transmitting terminal in the wireless communication network shown in FIG. In the network N, configuration information that the wireless terminal X1 holds in the control unit 1 until the start of transmission of communication data is shown.

The configuration of the control unit 1 will be further described with reference to FIG. In that case, FIGS. 3-5 is suitably referred.
The simultaneous transfer transmitting / receiving apparatus 11 is configured to perform simultaneous transfer of communication data using the wireless transmission circuit 21 and the wireless reception circuit 22 of the wireless unit 2. More specifically, the same communication data is transmitted to the wireless terminal X capable of direct communication (communication with one hop). The simultaneous transfer transmitting / receiving apparatus 11 is indispensable as a means for realizing “broadcast communication” according to the present invention as quickly as possible.

The relay packet transmitting / receiving apparatus 12 is configured to relay communication data using the wireless transmission circuit 21 and the wireless reception circuit 22 of the wireless unit 2.
The relay stage number table 13 is a table that holds the number of logical relays (the number of hops) from the own terminal to each of all the wireless terminals X in the wireless communication network N, and is set in advance. That is, the table indicates how many hops can be communicated with each wireless terminal X in the wireless communication network N. Specific contents of the relay stage number table 13 are illustrated in FIG. FIG. 4A shows a case where terminal number 1 (X1 in FIG. 3) is the own terminal. The setting of the relay stage number table 13 is performed, for example, by grasping the mutual positional relationship in the network by communication when the wireless communication network N is constructed.

  The I / F (interface) is an interface that can be connected to various sensors S and the like, and is provided in all the wireless terminals X in the wireless communication network N shown in FIG.

  The packet transmission / reception control device 10 is configured to designate another wireless terminal X as a destination and transmit communication data to the destination. In the present embodiment, the wireless terminal X that is at the farthest distance from the own terminal that is the transmission terminal (the number of logical relays is the largest) is set as the destination. More specifically, referring to the relay stage number table 13, the simultaneous transfer transmission / reception apparatus 11 or the relay packet transmission / reception apparatus 12 is used to perform simultaneous transfer or relay of communication data.

  When executing simultaneous transfer, the synchronization time control unit 100 is used to control the synchronization waiting time in the simultaneous transfer. More specifically, the synchronization time control unit 100 stores a preset synchronization waiting time and includes a timer, and the time counted by the timer from the start of simultaneous transfer has reached the synchronization waiting time (timeout If the communication data has been transmitted to all the wireless terminals that should be transferred simultaneously, the simultaneous transfer is ended.

  Note that the synchronization waiting time of the wireless terminal X responsible for simultaneous transfer refers to the relay stage number table 13 and the untransferred terminal information of the own terminal, and totals the number of adjacent wireless terminals X (having a hop number of 1), The synchronization waiting time is set by the following formula based on the total number of terminals.

  Now, assuming that the synchronization beacon signal transmission cycle of each wireless terminal X is T (seconds) and the number of untransferred terminals of its own station (wireless terminal responsible for simultaneous transfer) is n, synchronization waiting time Tw (seconds) for simultaneous transfer ) Is set by the following equation (1).

Tw = T × (n + 1) (1)

FIG. 5 is a diagram illustrating a packet format example of communication data transmitted and received by the intermittent operation wireless terminal according to the embodiment of the present invention. In FIG. 5, in the header part of the communication data transmitted / received between the intermittently operating wireless terminals X, the terminal ID (terminal number) of the partner wireless terminal X to which information is to be transmitted is set as “destination terminal ID”. The “untransferred terminal information” illustrated in 4 (b) is set. Here, “untransferred terminal information” is information indicating whether or not the communication data has been received for each wireless terminal X in the wireless communication network N, and the flag “1” indicates that it has not been received.

  In the communication data main body shown in FIG. 5, “communication information”, which is information to be transmitted to all wireless terminals in the wireless communication network N, is set. Here, as the “transmission information”, for example, a fire alarm indicating that a fire has occurred, a setting change command indicating that the setting of the wireless terminal X is changed, and the like are assumed.

  In the present embodiment, the packet transmission / reception control device 10 of the intermittent operation wireless terminal X that transmits information to be transmitted sets “transmission information” in the main body of the communication data shown in FIG. “Destination terminal ID” and “untransferred terminal information” are added to form communication data. Specifically, the packet transmission / reception control device 10 transmits, as communication data, a list of wireless terminals X to which communication data as shown in FIG. 4B is transmitted (untransferred) in the untransferred terminal information column of the “header”. And the terminal ID (terminal number) of the wireless terminal X having the largest number of logical relays from the own terminal among the wireless terminals X to be transmitted to the destination terminal ID column is set.

Further, the packet transmission / reception control device 10 shown in FIG. 2 intermittently transmits a beacon signal indicating that the own terminal is active to the surrounding wireless terminal X via the wireless transmission circuit 21 of the wireless unit 2. Further, the packet transmission / reception control device 10 is configured to receive a beacon signal of another terminal via the wireless reception circuit 22 of the wireless unit 2 and adjust the timing of transmitting communication data from the own terminal based on the received signal. Has been. With such a configuration, it is possible to reduce the power consumption of the wireless terminal X by reducing the waiting time to unnecessarily start up the wireless reception circuit 22 of the wireless unit 2 and receive the beacon signal.
[Relay and simultaneous transfer]
Hereinafter, a communication data transmission / reception method when “relay” is executed using FIGS. 3 to 7 and a communication data transmission / reception method when “simultaneous transfer” is executed will be described using FIGS. 8 and 9. To do.

  In the wireless communication network N shown in FIG. 3, a method for transmitting communication data will be described by taking as an example a case where the wireless terminal X1 becomes a transmission terminal and broadcasts communication data to all the wireless terminals X in the network N. A list of the number of logical relays shown in FIG. 4A is set in advance in the relay stage number table 13 of the wireless terminal X1 serving as the transmission terminal. In this state, when the wireless terminal X1 becomes the transmitting terminal, the packet transmission / reception control device 10 of the wireless terminal X1 has the largest number of logical relays in the relay stage number table 13 in the packet format of the communication data shown in FIG. The wireless terminal X11 is set as the destination terminal ID, and the wireless terminal X other than the own terminal (terminal number 1) adds the untransferred terminal information (see FIG. 4B) as an untransferred terminal and transmits it.

  FIG. 6 is a diagram for explaining transmission / reception of communication data by the intermittent operation wireless terminal in the wireless communication network shown in FIG. In FIG. 6, the wireless terminal X11 (circle with vertical stripes) is the destination, and communication data transmitted from the wireless terminal X1 (circle with diagonal stripes) is transmitted to the wireless terminal X11 before other wireless data is transmitted. It is assumed that communication data is relayed via the terminal X. In FIG. 6, the transmission path of communication data is indicated by broken-line arrows, and the wireless terminal X that has received the communication data is indicated by a circle with dark diagonal stripes. In this example, the case where simultaneous transfer is executed in the wireless terminal X12 one hop before the destination wireless terminal X11 is shown. When each wireless terminal X (X2, X7) from the wireless terminal X1 to the wireless terminal X12 receives the transmitted communication data, it captures the communication data in its own terminal, and the packet transmission / reception control device 10 receives the untransferred terminal information. Update. Specifically, by rewriting the untransferred state of the own terminal listed in the untransferred terminal information to “transferred” (the blank in the example represents a flag “0”), Exclude devices.

  FIG. 7 is a diagram illustrating a relay stage number table of wireless terminals that perform simultaneous transfer in the wireless communication network illustrated in FIG. 6 and a list of updated untransferred terminal information. 7A shows information in the relay stage number table 13 in the wireless terminal X12, and FIG. 7B shows a list of untransferred terminal information held in the wireless terminal X12. Since the wireless terminal X12 is adjacent to the destination wireless terminal X11 (the number of logical relays is 1), when communication data is received, "simultaneous transfer" is executed with reference to the untransferred terminal information shown in FIG. 7B. To do. The wireless terminal X12 sets the wireless terminal X (X11, X13 to X15) in the untransferred state among the adjacent wireless terminals X (the number of logical relays is 1) shown in FIG. Transfer ". Specific “simultaneous transfer” will be described later.

  FIG. 8 is a diagram showing a sequence example when the simultaneous transfer is successful according to the embodiment of the present invention. In FIG. 8, when the packet transmission / reception control device 10 (see FIG. 2) at its own terminal requests the wireless terminal X12 to execute simultaneous transfer, the synchronization time control unit 100 in the packet transmission / reception control device 10 relays the wireless terminal X12. Referring to the stage number table 13 (see FIG. 2), the number of untransferred terminals at the station adjacent to the wireless terminal X12 (the number of logical relays is 1) is tabulated, and based on this, the above equation (1) is obtained. The synchronization waiting time in the simultaneous transfer is calculated using the calculation formula, and the wireless reception circuit 22 is set in an active state so as to wait for a beacon signal from another wireless terminal X during the synchronization waiting time obtained by the calculation. .

  Specifically, it is assumed that the synchronization beacon signal transmission cycle of each wireless terminal X in this embodiment is set to 5 seconds, and untransferred terminal information (when relayed to the wireless terminal X12) ( Referring to FIG. 7 (b)) and the relay stage number table of wireless terminal X12 (FIG. 7 (a)), since the number of untransferred terminals among the adjacent stations of wireless terminal X12 is 4, the above formula (1) Therefore, the synchronization waiting time at this time is Tw = 5 (seconds) × (4 + 1) = 25 (seconds).

  For example, when a “beacon” signal is received from another wireless terminal X (X11), after transmitting a “transfer request” notification informing that transmission of communication data starts, communication data (“transfer data” in the figure) continues. ). When the wireless terminal X11 has received the communication data, the wireless terminal X11 transmits a “transfer complete” notification informing that the reception of the communication data has been completed, and the wireless terminal X12 receives the “transfer complete” notification. End the session with. Similarly, the wireless terminal X12 opens a session by receiving a “beacon” signal from the other wireless terminal X (X14, X13, X15) and transmits communication data, and the other wireless terminal X (X14, X14, X13, X15) receive the “transfer complete” notification to end the session. When the session with all the wireless terminals X that have not been transferred within the synchronization waiting time Tw is ended, reception of the beacon signal is interrupted, and the simultaneous transfer is ended. In this way, transfer of communication data to all untransferred wireless terminals in the own station is completed within the Tw time calculated using the above formula (1) (“simultaneous transfer” is in operation during this time). If it is possible, the reception of the beacon signal is interrupted at that time, the simultaneous transfer is terminated, and the process proceeds to the next transfer.

  FIG. 8 shows an example of a sequence when the simultaneous transfer succeeds thus obtained. Transfer of communication data from all the wireless terminals X to be simultaneously transferred by the wireless terminal X12 responsible for the simultaneous transfer is shown. Is terminated, the reception of the beacon signal is interrupted without waiting for the timeout of the synchronization waiting time Tw = 25 (seconds) calculated using the above equation (1), the simultaneous transfer is terminated, and the next transfer is completed. Therefore, it is possible to reduce the time required for the simultaneous transfer, and all of the own stations are within the synchronization waiting time Tw obtained by the calculation even in the simultaneous transfer in the wireless terminal responsible for the simultaneous transfer in the next transfer. If the simultaneous transfer to the wireless terminal can be completed, it is possible to reduce the total time required for data broadcast as the entire wireless communication network.

  FIG. 9 is a diagram showing a sequence example when simultaneous transfer fails according to the embodiment of the present invention. As shown in FIG. 9, for example, the synchronous waiting time in the simultaneous transfer is calculated using the calculation formula shown in the above formula (1), and during the synchronous waiting time obtained by the calculation (“beacon signal waiting” in the figure). ”), The communication data is sent to all the wireless terminals X in the untransferred state due to occurrence of a signal not being received from the wireless terminal X in the untransferred state that is the simultaneous transfer destination for some reason (signal unreachable). If the transmission fails, the synchronization waiting time in the simultaneous transfer will be timed out, and even if there is a wireless terminal X in an untransferred state, it will be ignored and the simultaneous transfer will be terminated, and the next transfer will be processed. Transition.

  In this way, by terminating the simultaneous transfer based on the timeout of the synchronization waiting time in the simultaneous transfer and shifting the process to the next transfer, the untransferred terminal as shown in FIG. Until there is no untransferred wireless terminal X in the information, any wireless terminal X in the network repeats “relay” and “simultaneous transfer” to complete broadcast transmission of the information to be transmitted as quickly as possible. .

  In this case, when the simultaneous transfer is terminated due to the timeout, the process is shifted to the next transfer and the simultaneous transmission is not completed even for the wireless terminal X in which the simultaneous transfer is not completed. ”And“ simultaneous transfer ”are repeatedly executed, so that the wireless terminal X12 responsible for the“ simultaneous transfer ”to the wireless terminal X can simultaneously perform broadcast communication by performing simultaneous transfer to the untransferred terminal X15. It can be completed quickly (confirmation of transmission of communication data).

  As described above, the broadcast communication system of the wireless communication network according to the embodiment of the present invention does not leak communication data to all intermittently operated wireless terminals X in the wireless communication network N (reception confirmation by transfer completion). The broadcast communication can be completed quickly.

  FIG. 10 is a diagram illustrating the flow of communication data until broadcast communication is completed in the wireless communication network according to the embodiment of the present invention. The concept that forms the center of the broadcast communication in the present invention is to combine “relay” and “simultaneous transfer” executed by the related wireless terminals as described above. The wireless terminal responsible for “simultaneous transfer” is selected one hop before the wireless terminal having the largest number of logical relays than the transmitting terminal. Since the transmitting terminal selects the wireless terminal having the largest number of logical relays as the destination, if the destination wireless terminal is selected as the wireless terminal responsible for “simultaneous transfer”, the wireless terminal having a larger number of logical relays than the destination terminal is selected. It becomes nonexistent and “simultaneous transfer” cannot be realized. For this reason, the wireless terminal responsible for “simultaneous transfer” is characterized in that a wireless terminal that is one hop ahead of the terminal having the largest number of logical relays than the originating terminal is selected to perform “simultaneous transfer”.

In addition, the start timing of “simultaneous transfer” in the present invention is that the untransferred terminal information is added to the wireless terminal X existing one hop before the destination (the wireless terminal X having the largest number of logical relays from the wireless terminal X that is the transmitting terminal). “Simultaneous transfer” is started when the received communication data arrives and the relay stage number table 13 of the wireless terminal is updated. Hereinafter, the above will be described in detail.
In FIG. 10A, for example, the wireless terminal X1 that has become the transmitting terminal has the wireless terminal X11 that has the largest number of logical relays from its own terminal (the wireless terminal X11 and the wireless terminals X13 to X15 are in an untransferred state when viewed from the wireless terminal X1). The wireless terminal X1 has the same number of hops and the same number of hops, but the wireless terminal X11 is selected as a representative from the wireless terminal X11 and the wireless terminals X13 to X15). Until the communication data is transmitted to the wireless terminal X11, the communication data is relayed through the other wireless terminals X2 and X7. In the figure, the transmission path of communication data is indicated by a solid arrow, and “simultaneous transfer” is executed in the wireless terminal X12 one hop before the destination wireless terminal X11. A simultaneous transfer path of communication data from the wireless terminal X12 to the wireless terminals X11 and X13 to X15 is indicated by a dashed arrow. When the wireless terminals X2 and X7 from the wireless terminal X1 to the wireless terminal X12 receive the communication data, the wireless terminal X2 captures the communication data in the own terminal, and the packet transmission / reception control device 10 of the own terminal updates the untransferred terminal information. I do. An example of the updated untransferred terminal information has already been described in the description of FIG.

  The wireless terminal X12 refers to the relay stage number table of its own terminal and the untransferred terminal information (see FIGS. 7A and 7B), and uses the calculation formula shown in the above formula (1) to determine the simultaneous transfer timing. The simultaneous transfer is executed by adjusting the synchronization waiting time in the simultaneous transfer so as to be proportional to the number of untransferred terminals. A state of execution of simultaneous transfer is indicated by a broken line. In the present invention, the term “simultaneous” is referred to. However, the meaning of “simultaneous” does not mean literally as described above with reference to FIG.

  In addition, in the present invention, the intermittent wireless communication method is adopted to prevent battery consumption, so that a wireless communication sequence (procedure) between wireless terminals has a sleep to prevent battery consumption, and simultaneous transfer is performed. Since the responsible wireless terminal communicates with the wireless communication sequence described above also in each simultaneous transfer with the wireless terminal in the local station, at least the wireless terminal responsible for the simultaneous transfer ends the session with all the wireless terminals of the local station. The time until is the “simultaneous transfer” state.

  However, there is a disturbance in wireless communication, and the synchronization waiting time in simultaneous transfer is determined by securing some margin by the calculation formula according to the above formula (1). Furthermore, in the present invention, at the time of “session end” between the wireless terminals, it is confirmed that the other party has received the data upon receiving the “transfer complete” notification, so that the transmission of communication data to all the wireless terminals is performed. You can make sure that there is no omission. By doing in this way, it becomes possible to apply this invention to a fire alarm system or a crime prevention system.

  Then, the wireless terminal X12 that has finished the simultaneous transfer to all the wireless terminals refers to the relay stage number table and the untransferred terminal information (see FIGS. 7 (a) and 7 (b)) stored in the own terminal. In addition to this, it is confirmed that there is a wireless terminal X in an untransferred state, and this time, the own terminal becomes a transmitting terminal, and the wireless terminal in an untransferred state having the largest number of hops stored in the relay stage number table of the own terminal Is set as the destination, and the communication data is transmitted, the communication is continued toward the completion of the broadcast communication as soon as possible.

  In FIG. 10B, the wireless terminal X12 that has become a new transmitting terminal refers to the untransferred terminal information shown in FIG. 7B, and the wireless terminal X3 (wireless terminal) having the largest number of hops in the untransferred state. The wireless terminal X1 and the wireless terminals X3 to X5 are wireless terminals having the same number of hops with the largest number of hops as viewed from X12. The wireless terminal X3 is selected as a representative from the terminals X3 to X5), and the communication data is transmitted. The transmitted communication data is relayed to the wireless terminal X2 one hop before the destination wireless terminal X3, and the wireless terminal X2 determines that the wireless terminal is a wireless terminal one hop before the destination wireless terminal X3 and is responsible for simultaneous transfer. It becomes a terminal and performs simultaneous transfer. By the simultaneous transfer by the wireless terminal X2, “simultaneous transfer” is executed to the wireless terminal X3, the wireless terminal X4, and the wireless terminal X5 that are destinations. A simultaneous transfer path of communication data from the wireless terminal X2 to the wireless terminals X3 to X5 is indicated by a broken line arrow.

  The wireless terminal X2, which has finished simultaneous transfer to all wireless terminals, refers to the relay stage number table and untransferred terminal information (not shown) stored in its own terminal, and is in a non-transferred state other than its own station. Confirm that X exists, and this time, the local terminal becomes the transmitting terminal, and the wireless terminal with the largest number of hops stored in the relay stage number table of the local terminal is set as the destination and the communication data By transmitting, the communication is continued toward the completion of the broadcast communication as soon as possible.

  Next, in FIG. 10 (c), the wireless terminal X2 that has become the new transmitting terminal refers to the relay stage number table and the untransferred terminal information that are stored in its own terminal (not shown), and hops in the untransferred state. The wireless terminal X9 with the largest number (the wireless terminal X6 and the wireless terminals X8 to X10 as viewed from the wireless terminal X2 are wireless terminals with the same number of hops in the untransferred state, but the wireless terminal X6 and the wireless terminal X8 To the wireless terminal X9 as a representative from among X10) is set as the destination, and the communication data is transmitted. The transmitted communication data is relayed to the wireless terminal X7 that is one hop before the destination wireless terminal X9, and the wireless terminal X7 determines that the wireless terminal is a wireless terminal that is one hop before the destination wireless terminal X9 and is responsible for simultaneous transfer. It becomes a terminal and performs simultaneous transfer. By the simultaneous transfer by the wireless terminal X7, “simultaneous transfer” is executed to the wireless terminal X6, the wireless terminal X8, the wireless terminal X9 and the wireless terminal X10 that are the destinations. A simultaneous transfer path of communication data from the wireless terminal X7 to the wireless terminals X6 and X8 to X10 is indicated by a dashed arrow.

  The wireless terminal X7 that has completed simultaneous transfer to all wireless terminals refers to the relay stage number table and untransferred terminal information (not shown) stored in its own terminal, and the wireless terminal X in the untransferred state wirelessly After confirming that it no longer exists in the communication network N, it is determined that the communication data has been broadcast to all the wireless terminals X in the wireless communication network N, and the broadcast communication process is terminated.

  As described above, in the embodiment of the present invention, the wireless terminal X in the wireless communication network N communicates with all the wireless terminals X in the wireless communication network N by participating in the relay and simultaneous transfer and repeating the relay and simultaneous transfer. Since data is broadcast, broadcast communication of information to be transmitted can be completed as soon as possible (confirmation of transmission of communication data).

  In addition, according to the embodiment of the present invention, in a so-called multi-hop network, a session is opened and communication data is transmitted by receiving a “beacon” signal from another wireless terminal without being affected by the topology of the network. By receiving a “transfer complete” notification from another wireless terminal, the communication procedure for terminating the session is adopted, so that the performance of the communication is not changed and the battery consumption is suppressed and broadcast to all wireless terminals in the network. Communication data to be distributed can be distributed as quickly as possible.

DESCRIPTION OF SYMBOLS 1 Control part 2 Radio | wireless part 3 Intermittent operation control part 5 Antenna 10 Packet transmission / reception control apparatus 11 Simultaneous transfer transmission / reception apparatus 12 Relay packet transmission / reception apparatus 13 Relay stage number table 21 Wireless transmission circuit 22 Wireless reception circuit 23 Switching part 100 Synchronization time control part B Battery (Battery)
I / F interface S sensor X intermittent operation wireless terminal

Claims (4)

A wireless transmission circuit for transmitting the data by radio, the wireless communication network formed by a plurality of intermittent operation the wireless terminal and a wireless receiver circuit for receiving a transmitted manner was data wirelessly constitutes a so-called multi-hop network A broadcast communication system for a wireless communication network,
The intermittent operation wireless terminal stores the number of logical relays to all wireless terminals in the network in advance in the relay stage number table by mutual prior communication, and the intermittent operation wireless terminal that transmits information becomes a transmission terminal. Information to be transmitted is generated as communication data, a list of wireless terminals to which information is transmitted as untransferred terminal information is added to the communication data, and the own terminal among the wireless terminals to be transmitted with reference to the relay stage number table Communication data transmission control means for selecting a wireless terminal having the largest number of logical relays from as a destination and transmitting communication data;
An intermittently operating wireless terminal that relays the communication data from the transmitting terminal to the destination, captures the communication data in its own terminal, and updates the untransferred terminal information; ,
When the intermittently operating wireless terminal that has updated the untransferred terminal information confirms the relay stage number table of its own terminal and its own terminal becomes a destination adjacent station, it becomes a wireless terminal responsible for simultaneous transfer, and Confirming untransferred terminal information and counting the number of untransferred wireless terminals in the own station, setting a synchronization waiting time proportional to the total number of untransferred terminals, and within the synchronization waiting time within the own station Simultaneous transfer transmission / reception means for performing simultaneous transfer to a wireless terminal in an untransferred state;
The intermittently operating wireless terminal responsible for the simultaneous transfer does not wait for the synchronization waiting time to end without waiting for the synchronization waiting time to end when the simultaneous transfer to all wireless terminals within the station is completed. With reference to the relay stage number table and untransferred terminal information held by the terminal, the self-terminal becomes a new transmission terminal, the intermittent operation wireless terminal having the largest number of logical relays from the self-terminal is set as the destination and the untransferred terminal information When a list of wireless terminals to which information is to be transmitted is added to communication data and transmitted, and the wireless terminal to be simultaneously transferred by the intermittently operating wireless terminal responsible for the simultaneous transfer of the communication data is no longer present in the network Broadcast completion means for completing communication,
A broadcast communication system for a wireless communication network. A wireless transmission circuit for transmitting the data by radio, the wireless communication network formed by a plurality of intermittent operation the wireless terminal and a wireless receiver circuit for receiving a transmitted manner was data wirelessly constitutes a so-called multi-hop network A broadcast communication method for a wireless communication network,
The intermittent operation wireless terminal stores the number of logical relays to all wireless terminals in the network in advance in the relay stage number table by mutual prior communication, and the intermittent operation wireless terminal that transmits information becomes a transmission terminal. Information to be transmitted is generated as communication data, a list of wireless terminals to which information is transmitted as untransferred terminal information is added to the communication data, and the own terminal among the wireless terminals to be transmitted with reference to the relay stage number table Select the wireless terminal with the largest number of logical relays from as the destination and send the communication data,
The intermittent operation wireless terminal that relayed in the middle of transmitting the communication data from the calling terminal to the destination captures the communication data in its own terminal, updates the untransferred terminal information,
When the intermittently operating wireless terminal that has updated the untransferred terminal information confirms the relay stage number table of its own terminal and its own terminal becomes a destination adjacent station, it becomes a wireless terminal responsible for simultaneous transfer, and Confirming untransferred terminal information and counting the number of untransferred wireless terminals in the own station, setting a synchronization waiting time proportional to the total number of untransferred terminals, and within the synchronization waiting time within the own station Simultaneous transfer to untransferred wireless terminals,
The intermittently operating wireless terminal responsible for the simultaneous transfer does not wait for the synchronization waiting time to end without waiting for the synchronization waiting time to end when the simultaneous transfer to all wireless terminals within the station is completed. With reference to the relay stage number table and untransferred terminal information held by the terminal, the self-terminal becomes a new transmission terminal, the intermittent operation wireless terminal having the largest number of logical relays from the self-terminal is set as the destination and the untransferred terminal information When a list of wireless terminals to which information is to be transmitted is added to communication data and transmitted, the wireless terminals to be simultaneously transferred by the intermittent operation wireless terminals responsible for the simultaneous transfer of the communication data are no longer present in the communication network. A broadcast communication method for a wireless communication network, characterized in that the broadcast communication is completed. A wireless transmission circuit for transmitting the data by radio, the wireless communication network formed by a plurality of intermittent operation the wireless terminal and a wireless receiver circuit for receiving a transmitted manner was data wirelessly constitutes a so-called multi-hop network Keru Contact to the wireless communication network, wherein a intermittent operation the wireless terminal, simultaneously when referring to its own terminal to the destination in the communication data transmitting terminal transmits is determined to be one hop before the wireless terminal from the destination Become the wireless terminal responsible for the transfer,
The wireless terminal that is responsible for the simultaneous transfer is
Simultaneous transfer transmission / reception means for simultaneously transferring the communication data using the wireless transmission circuit and the wireless reception circuit;
Synchronization time control means for controlling synchronization waiting time in simultaneous transfer,
The synchronization time control means refers to the untransferred terminal information of the own terminal held by the own terminal, totals the number of adjacent radio terminals (having a hop count of 1), and the total number of untransferred radio terminals is n At some time, the synchronization waiting time Tw is calculated using the following formula:
Tw = T × (n + 1) where T is a synchronous beacon transmission period, and the simultaneous transfer transmission / reception means obtains confirmation that all the wireless terminals of its own station have received the communication data within the synchronization waiting time Tw If the simultaneous transfer ends without waiting for the end of the synchronization waiting time, or if the confirmation that the communication data has been received when the synchronization waiting time Tw ends is not obtained, Even if there is a wireless terminal in the transfer state, the simultaneous transfer ends, and after the simultaneous transfer ends, the own terminal becomes a new calling terminal, and the relay stage number table and untransferred terminal information held by the own terminal are referred to. , Adding a list of wireless terminals to which information is transmitted as destination and untransferred terminal information to a wireless terminal having the largest number of logical relays when viewed from the own terminal,
If there are no other untransferred terminals to be simultaneously transferred with reference to the relay stage number table of the own terminal and the untransferred terminal information, it is determined that the broadcast to all the wireless terminals in the wireless communication network has spread. The intermittent operation wireless terminal is characterized in that the broadcast communication is terminated. A wireless transmission circuit for transmitting the data by radio, the wireless communication network formed by a plurality of intermittent operation the wireless terminal and a wireless receiver circuit for receiving a transmitted manner was data wirelessly constitutes a so-called multi-hop network Keru Contact to the wireless communication network, wherein a intermittent operation the wireless terminal, each of the intermittent operation the wireless terminal,
It has a relay stage number table that holds the number of logical relays to all wireless terminals in the network in advance by mutual prior communication,
When an event for transmitting information occurs, the terminal becomes a transmitting terminal, generates information to be transmitted as communication data, and stores a list of untransferred wireless terminals to which information is to be transmitted in the communication data. The communication data is selected by adding the wireless terminal with the largest number of logical relays from its own terminal as the destination among the untransferred wireless terminals to be transmitted with reference to the relay stage number table added as forwarding terminal information Send
When communication data is transmitted from another terminal, and the own terminal is not the destination of the communication data and is not an adjacent station of the destination, it becomes a wireless terminal responsible for relaying and transmits the communication data. The untransferred terminal information that has been captured and added to the communication data is updated so as to be transferred for the own terminal, and then the updated untransferred terminal information is added to the communication data for the next transfer. Send it to the destination
When communication data is transmitted from another terminal, and the own terminal is an adjacent station of the destination of the communication data, it becomes a wireless terminal responsible for simultaneous transfer and has been added to the communication data Check the untransferred terminal information, total the number of radio terminals in the untransferred state among the radio terminals adjacent to the own terminal, and set a synchronization waiting time proportional to the total number of radio terminals in the untransferred state, Simultaneously transferring the communication data to the untransferred wireless terminal within the synchronization waiting time,
When the simultaneous transfer is completed, the own terminal becomes a new transmitting terminal, and the number of logical relays from the own terminal is the largest with reference to the relay stage number table and the untransferred terminal information of the own terminal. The wireless terminal in the untransferred state becomes the destination, and the untransferred terminal information is updated to be transferred for the own terminal, and the updated untransferred terminal information is added to the communication data. An intermittent operation wireless terminal characterized by transmitting .