JP7435072B2 - Communication systems and programs - Google Patents

Description

The present invention relates to a communication system including a plurality of communication terminals and a program executed by the communication terminals.

2. Description of the Related Art Conventionally, a technique for transmitting data between a plurality of communication terminals using a multi-hop technique is known. Patent Document 1 and Non-Patent Document 1 disclose simultaneous transmission flooding techniques in which a communication terminal that has received data broadcast from another communication terminal repeatedly broadcasts the received data.

JP 2019-21964 Publication

Sonas Co., Ltd., "What is simultaneous transmission flooding?", [online], [searched on March 9, 2020], Internet <https://www.sonas.co.jp/technology/unisonet/mechanism>

In the conventional simultaneous transmission flooding technique, a communication terminal that receives data broadcasts the received data regardless of the destination of the data. Therefore, the communication terminal sometimes broadcasts the received data even though it is meaningless to broadcast the data. As a result, there is a problem in that the power consumption of the entire communication system becomes larger than necessary.

The present invention has been made in view of these points, and an object of the present invention is to reduce the power consumption of a communication system that transmits data using a multi-hop method.

A communication system according to a first aspect of the present invention includes a plurality of communication terminals belonging to one of a plurality of hierarchies, and one or more of the communication terminals belonging to the same hierarchy simultaneously transmit transmission data. Each of the plurality of communication terminals includes a storage unit that stores the own terminal hierarchy to which the own terminal belongs, and a data reception unit that receives transmission data transmitted by another communication terminal among the plurality of communication terminals. a transmission destination hierarchy identification unit that identifies a transmission destination hierarchy that is the transmission destination hierarchy indicated by the transmission destination information included in the transmission data received by the data reception unit; and a data transmitter that transmits the transmission data received by the data receiver, provided that the data is different from the hierarchy.

The data transmission unit transmits the transmission data on the condition that the own terminal hierarchy is closer to the destination hierarchy than the transmission source hierarchy to which the other communication terminal that has transmitted the transmission data received by the data reception unit belongs. may be sent.

The destination information includes range information that specifies a range of some communication terminals to which the transmission data is to be transmitted among the plurality of communication terminals included in the same hierarchy, and the storage unit The data transmitter further stores information indicating the position of the own terminal, and the data transmitting unit is configured to include the position of the own terminal stored in the storage unit within a predetermined range from the range indicated by the range information. The transmission data may be transmitted on the condition that the transmission data is present.

The destination information includes routing information indicating a route through which the transmission data is transmitted, the storage unit further stores information indicating the location of the own terminal, and the data transmission unit: The transmission data may be transmitted on condition that the location of the own terminal stored in the storage unit is included in the routing information.

A program according to a second aspect of the present invention provides the communication system included in a communication system that includes a plurality of communication terminals belonging to any one of a plurality of hierarchies, and in which the communication terminals belonging to the same hierarchy simultaneously transmit transmission data. a data receiving unit that receives transmission data transmitted by another communication terminal among the plurality of communication terminals, and a transmission indicated by destination information included in the transmission data received by the data reception unit; A destination layer specifying unit identifies a destination layer, which is the next layer, and the transmission data received by the data receiving unit is transmitted to the next layer on the condition that the destination layer is different from the layer to which the communication terminal belongs. It functions as a data transmitter that transmits data to other communication terminals in the hierarchy.

According to the present invention, it is possible to reduce the power consumption of a communication system that transmits data using a multi-hop method.

FIG. 1 is a diagram for explaining an overview of a communication system. FIG. 2 is a diagram illustrating an example of a format of transmission data transmitted in a communication system. FIG. 2 is a diagram showing the configuration of a communication terminal. FIG. 7 is a diagram illustrating another example of the operation of the communication system. FIG. 7 is a diagram illustrating another example of the operation of the communication system. FIG. 7 is a diagram illustrating another example of the operation of the communication system. FIG. 7 is a diagram illustrating another example of the operation of the communication system. FIG. 7 is a diagram illustrating another example of the operation of the communication system. FIG. 7 is a diagram illustrating another example of the operation of the communication system.

[Overview of communication system S]
FIG. 1 is a diagram for explaining an overview of the communication system S. The communication system S includes a plurality of communication terminals 1 belonging to one of a plurality of hierarchies, and performs multi-hop transmission using a simultaneous transmission flooding method in which one or more communication terminals 1 belonging to the same hierarchy simultaneously transmit transmission data. It is a system that does this. Each of the plurality of communication terminals 1 broadcasts transmission data using radio waves in the 920 MHz band, for example.

Each of the plurality of rectangles in FIG. 1 indicates a communication terminal 1. In FIG. The horizontal direction in FIG. 1 indicates the hierarchy in which transmission data is transmitted in the communication system S. For example, transmission data transmitted from the communication terminal 1-1G belonging to the first hierarchy The information is transmitted in the following order: 2nd layer X2, 3rd layer X3, 4th layer X4, 5th layer X5, 6th layer X6, and 7th layer X7. However, the direction in which the transmission data is transmitted is not limited to this direction. For example, transmission data transmitted by the communication terminal 1 belonging to the fourth layer X4 is transmitted to the fifth layer X5, the sixth layer X6, and the seventh layer X7, and also to the third layer It is transmitted toward the first layer X1.

The vertical direction in FIG. 1 corresponds to the positions of a plurality of communication terminals 1 belonging to the same hierarchy. In this specification, the communication terminal 1 at position P included in the n-th layer is referred to as communication terminal 1-nP (P is any one of A to L).

In FIG. 1, when transmission data is transmitted from the communication terminal 1-1G shown in diagonal lines to the communication terminal 1-5E shown in black, arrows indicate paths along which the data is transmitted. However, in FIG. 1, in order to make it easier to understand the flow of transmission data, arrows are not attached to all paths and all directions through which transmission data is transmitted. This point also applies to other drawings showing the configuration of the communication system S.

The transmission data transmitted by the communication terminal 1-1G is received by the communication terminal 1-2H and the communication terminal 1-2F. Communication terminal 1-2H and communication terminal 1-2F transmit the received transmission data to other communication terminals at a timing when a predetermined waiting time (for example, a predetermined time of 10 ms or more and 100 ms or less) has elapsed after receiving the transmission data. 1, the received transmission data is transmitted.

FIG. 2 is a diagram showing an example of the format of transmission data transmitted in the communication system S. Transmission data transmitted by the communication terminal 1 in the communication system S includes a preamble (PR), synchronization data (SYN), data identification information (ID), destination information, and a payload. The data identification information is a character string such as numbers or alphabets unique to the transmission data. The destination information is the address of the destination communication terminal 1, and includes information indicating the hierarchy. In the example shown in FIG. 1, 1-5E is included in the destination information as the address of communication terminal 1-5E.

The transmission data transmitted by the communication terminal 1-2H is received by the communication terminal 1-3I and the communication terminal 1-3G. The transmission data transmitted by the communication terminal 1-2F is received by the communication terminal 1-3G and the communication terminal 1-3E. The communication terminal 1-3G receives both the transmission data transmitted by the communication terminal 1-2H and the transmission data transmitted by the communication terminal 1-2F almost simultaneously. Since the transmission data sent by communication terminal 1-2F and the transmission data sent by communication terminal 1-2H have the same content, even if communication terminal 1-3G receives these transmission data almost at the same time, it is not normal. can receive the transmitted data.

In this way, the plurality of communication terminals 1 included in the second layer X2 to the fourth layer X4 sequentially transfer the received transmission data, so that the plurality of communication terminals 1 included in the fifth layer Receive. The plurality of communication terminals 1 included in the fifth layer X5 confirm that the destination information included in the transmission data indicates the communication terminal 1-5E belonging to the fifth layer X5. The plurality of communication terminals 1 included in the fifth layer X5 determine that the destination layer indicated by the destination information matches the layer to which they belong, and delete the received transmission data without forwarding it.

Because the communication terminal 1 operates in this manner, in the communication system S, the communication terminals 1 belonging to the sixth layer and the seventh layer do not receive or transmit transmission data. As a result, the communication system S can reduce the total power consumption of the plurality of communication terminals 1 included in the communication system S.
The configuration and operation of the communication terminal 1 will be described in detail below.

[Configuration of communication terminal 1]
FIG. 3 is a diagram showing the configuration of the communication terminal 1. As shown in FIG. The communication terminal 1 includes a communication section 11, a storage section 12, and a control section 13. The control unit 13 includes a data receiving unit 131, a destination layer specifying unit 132, a data transmitting unit 133, and a data processing unit 134.

The communication unit 11 includes a wireless communication controller for transmitting and receiving transmission data. The communication unit 11 inputs transmission data received from another communication terminal 1 to the data reception unit 131. The communication unit 11 also transmits transmission data input from the data transmission unit 133.

The storage unit 12 includes storage media such as ROM (Read Only Memory) and RAM (Random Access Memory). The storage unit 12 stores the own terminal hierarchy, which is the hierarchy to which the own terminal belongs. The storage unit 12 stores, for example, an address including information indicating the hierarchy to which the communication terminal 1 belongs. The address may be information that further indicates the location of the communication terminal 1. Furthermore, the storage unit 12 stores programs executed by the control unit 13.

The control unit 13 is, for example, a CPU (Central Processing Unit). The control unit 13 functions as a data receiving unit 131 , a destination layer specifying unit 132 , a data transmitting unit 133 , and a data processing unit 134 by executing a program stored in the storage unit 12 .

The data receiving unit 131 receives, via the communication unit 11, transmission data transmitted by another communication terminal 1 among the plurality of communication terminals 1 included in the communication system S. The data receiving unit 131 inputs the received transmission data to the destination layer specifying unit 132.

The destination layer specifying unit 132 specifies the destination layer, which is the layer of the destination indicated by the destination information included in the transmission data received by the data receiving unit 131. In the example shown in FIG. 1, the destination information includes the number "5" indicating that the hierarchy of the communication terminal 1-5E is the fifth layer X5, so the destination hierarchy identification unit 132 , specifies that the destination layer is the fifth layer X5.

The data transmitter 133 transmits the transmission data received by the data receiver 131, for example, on the condition that the destination layer is different from the own terminal layer. Specifically, upon receiving notification of the destination layer from the destination layer specifying section 132, the data transmitting section 133 reads out the own terminal layer stored in the storage section 12. The data transmitter 133 erases the transmission data without transmitting it when the destination layer and the own terminal layer are the same, and transmits the data via the communication section 11 when the destination layer and the own terminal layer are different. Send data.

For example, when a communication terminal 1 (for example, communication terminal 1-2H) that does not belong to the fifth layer The data receiving unit 131 determines that the hierarchy of the terminal and the own terminal are different, and transmits the transmission data after a predetermined standby time has elapsed since the data reception unit 131 received the transmission data. On the other hand, the data transmission unit 133 of the communication terminal 1 (for example, communication terminal 1-5C, communication terminal 1-5E, communication terminal 1-5G, communication terminal 1-5I, communication terminal 1-5K) belonging to the fifth layer X5 determines that the destination layer and the terminal layer match, and does not transmit the transmission data.

Furthermore, if the address indicated by the destination information matches its own address, the data transmitting unit 133 inputs the transmission data to the data processing unit 134 without transmitting the transmission data via the communication unit 11. . In the example shown in FIG. 1, the data transmitter 133 of the communication terminal 1-5E determines that the address indicated by the destination information matches its own address, and inputs the transmission data to the data processor 134. .

The data processing unit 134 performs predetermined processing on the transmission data input from the data transmitting unit 133. The predetermined process is, for example, a process of storing data included in a payload in the transmission data in the storage unit 12 or transmitting data included in the payload to a predetermined external device. As an example, if the communication system S is used for gas meter reading and the communication terminal 1 is installed in a gas meter reading meter in each household, the communication terminal 1 transmits the data included in the payload to the communication unit 11. and a different communication interface (not shown) to a server managed by the gas company.

[Other operation examples of communication system S]
The method of transmission processing of transmission data by the communication terminal 1 is not limited to the example shown in FIG. 1, and various variations are possible. Other operation examples of the communication system S will be described below.

FIG. 4 is a diagram showing another example of the operation of the communication system S. In Figure 1, it is assumed that the transmission data sent by the communication terminal 1 will only reach the communication terminal 1 in the next layer, but depending on the state of the wireless communication environment, the transmission data may be transmitted to a communication terminal in an unexpected layer. It is also conceivable that transmission data may arrive at 1. In the example shown in FIG. 4, transmission data transmitted by communication terminal 1-4D has reached communication terminal 1-6D.

In this way, in order to prevent the communication terminal 1 from transmitting the received transmission data when receiving unexpected transmission data, the data transmission unit 133 prevents the communication terminal 1 from transmitting the received transmission data when the own terminal hierarchy does not match the transmission destination hierarchy. However, if the own terminal layer (for example, the 6th layer The transmission data may not be transmitted.

In the example shown in FIG. 4, the communication terminal 1-6D receives transmission data from the communication terminal 1-4D, but the 6th layer X6 to which the communication terminal 1-6D belongs is the 5th layer which is the destination layer. Since this layer is assumed to receive transmission data from communication terminal 1 of X5, communication terminal 1-6D is not transmitting transmission data. By preventing the communication terminal 1 from transmitting transmission data when it belongs to a layer that is expected to receive transmission data from other communication terminals 1 belonging to the destination layer, the communication system S can Power consumption can be further reduced.

Note that when the own terminal layer is different from the source layer, the communication terminal 1 transmits transmission data when the own terminal layer is between the source layer and the destination layer, and the own terminal layer is the source layer. The transmission data may not be transmitted if there is no data between the destination layer and the destination layer.

The transmission data has an area indicating the transmission source layer so that the data transmission unit 133 can determine whether to transmit the transmission data based on the relationship between the transmission source layer and the own terminal layer, The data transmission unit 133 of the transmission source communication terminal 1 may transmit transmission data in which the own terminal hierarchy is included in the area indicating the transmission source hierarchy. In the example shown in FIG. 4, the own terminal hierarchy of communication terminal 1-6D is not between the source hierarchy to which communication terminal 1-4D, which is the transmission source terminal, belongs and the destination hierarchy to which communication terminal 1-5E belongs. , communication terminal 1-6D does not transmit transmission data. Note that the area indicating the source layer includes the layer to which the communication terminal 1 that first transmitted the transmission data belongs (first layer X1 in the example shown in FIG. 4), and the data is transmitted to other communication terminals. 1 may not be updated.

FIG. 5 is a diagram showing another example of the operation of the communication system S. The data transmitter 133 transmits the transmission data on the condition that the own terminal hierarchy is closer to the destination hierarchy than the transmission source hierarchy to which the other communication terminal 1 to which the data reception unit 131 has transmitted the transmission data belongs. It's okay. In this case, the data transmitter 133 may transmit the transmission data even if the own terminal layer is the same as the destination layer. In this case as well, the transmission data has an area indicating the source layer so that the data transmitter 133 can decide whether to transmit the transmission data based on the source layer. The data transmitter 133 of the communication terminal 1 may transmit transmission data in which the own terminal layer is included in the area indicating the source layer.

In the example shown in FIG. 5, communication terminal 1-4B and communication terminal 1-5C receive transmission data transmitted by communication terminal 1-4D. The own terminal hierarchy of the communication terminal 1-4B is the same as the source hierarchy to which the communication terminal 1-4D that sent the transmission data belongs, and the distance from the communication terminal 1-5E, which is the destination terminal, is that of the source terminal. It is longer than the distance from a certain communication terminal 1-4D to communication terminal 1-5E. In such a case, the communication terminal 1-4B does not transmit transmission data even if its own terminal hierarchy does not match the transmission destination hierarchy. By operating the communication terminal 1-4B in this manner, the communication system S can further reduce power consumption because it does not transmit transmission data that is less necessary.

On the other hand, the own terminal layer of the communication terminal 1-5C is closer to the destination layer than the source layer to which the communication terminal 1-4D that sent the transmission data belongs, and is further away from the communication terminal 1-5E, which is the destination terminal. is shorter than the distance from the communication terminal 1-4D, which is the source terminal, to the communication terminal 1-5E. In such a case, the communication terminal 1-5C transmits the transmission data even if its own terminal hierarchy matches the transmission destination hierarchy. By transmitting the transmission data from the communication terminal 1-5C, the communication terminal 1-5E can receive the transmission data from the communication terminal 1-4D and the communication terminal 1-4F even if the communication terminal 1-5E cannot normally receive the transmission data from the communication terminal 1-4D and the communication terminal 1-4F. Transmission data can be received from 5C.

In the example shown in FIG. 5, the communication terminal 1-5E transmits the transmission data to the communication terminal 1-5C and the communication terminal 1 after the communication terminal 1-4D and the communication terminal 1-4F belonging to the fourth layer - The same transmission data will be received from 5G. In this way, when the data receiving unit 131 receives the same transmission data multiple times, the data receiving unit 131 deletes the data received from the second time onwards without inputting it to the destination layer specifying unit 132. good.

FIG. 6 is a diagram showing another example of the operation of the communication system S. In the example shown in FIG. 1, communication terminal 1-1G, which is the source terminal, transmits transmission data to communication terminal 1-5E, which is one destination terminal, but the source terminal transmits data to multiple transmitting terminals. Transmission data may also be sent to. In order for the communication system S to operate in this way, the destination information includes a range that specifies the range of some communication terminals 1 to which transmission data is to be transmitted among a plurality of communication terminals 1 included in the same hierarchy. Contains information. The range information is, for example, text for specifying the range of positions in the same hierarchy. The destination information may include information indicating a plurality of hierarchies to which transmission data is to be transmitted.

In the example shown in FIG. 6, transmission data is transmitted to communication terminals 1 belonging to positions J, K, and L in each hierarchy. The data transmitting unit 133 transmits the transmission data on the condition that the position of the own terminal stored in the storage unit 12 is included within a predetermined range from the range indicated by the range information. In FIG. 6, communication terminals 1 included in a predetermined range to which transmission data is to be transmitted, and communication terminals 1 at positions H and I included in the range where radio waves can reach the communication terminals 1 included in the predetermined range. The data transmitter 133 transmits the transmission data received by the data receiver 131, but the data transmitters 133 at other positions do not transmit the transmission data.

By the data transmitter 133 operating in this manner, the communication terminal 1 that has the possibility of transmitting the transmission data to the range to which the transmission data is to be transmitted transmits the transmission data, and the other communication terminal 1 transmits the transmission data. do not send. As a result, the communication system S can further reduce power consumption.

FIG. 7 is a diagram showing another example of the operation of the communication system S. In the example shown in FIG. 7, in each layer, transmission data is transmitted to communication terminals 1 belonging to positions G and H corresponding to the range for transmitting transmission data (range R0 in FIG. 7). Then, data transmission of communication terminal 1 included in a range corresponding to positions E and F on both sides of the range (range R1 in FIG. 7) and a range corresponding to positions I and J (range R2 in FIG. 7) The unit 133 transmits the transmission data received by the data receiving unit 131, but the data transmitting units 133 at other positions do not transmit the transmission data. In this way, by making the communication terminals 1 in the vicinity of the range to which the transmission data is transmitted transmit the transmission data, the communication terminals 1 within the range to which the transmission data is to be transmitted can receive the transmission data. It is possible to increase the probability that communication is possible and to reduce power consumption in the communication system S.

FIG. 8 is a diagram showing another example of the operation of the communication system S. In the example shown in FIG. 8, the transmission data includes information indicating a route for transmitting the transmission data. Specifically, the destination information includes routing information indicating a route along which the transmission data is transmitted. The routing information includes, for example, addresses of a plurality of communication terminals 1 on a route along which transmission data is to be transmitted. In the example shown in FIG. 8, the routing information includes information such as communication terminal 1-2H, communication terminal 1-3I, communication terminal 1-4J, communication terminal 1-5I, communication terminal 1-6J, and communication terminal 1-7K. It is.

In this case, the data transmitting unit 133 transmits the transmission data on the condition that the location of the own terminal stored in the storage unit 12 is included in the routing information. In the case of the example shown in FIG. 8, the data transmitting units 133 of communication terminal 1-2H, communication terminal 1-3I, communication terminal 1-4J, communication terminal 1-5I, communication terminal 1-6J, and communication terminal 1-7K are as follows: The data receiving section 131 transmits the received transmission data, and the data transmitting section 133 of the other communication terminal 1 does not transmit the transmission data. In this way, the data transmitting unit 133 determines whether or not to transmit the transmission data received by the data receiving unit 131 based on the routing information included in the transmission data, thereby performing the communication specified in the routing information. Since only the terminal 1 transmits the transmission data, the communication system S can further reduce power consumption.

FIG. 9 is a diagram showing another example of the operation of the communication system S. In the example shown in FIG. 1, it was assumed that transmission data would be transmitted from the first layer X1 to the seventh layer X7. On the other hand, in the example shown in FIG. 9, the transmission data is transmitted not in one direction, but in the hierarchy on both sides of the hierarchy to which the transmission source communication terminal 1 belongs. They are different in this respect.

In the example shown in FIG. 9, the communication terminal 1-4F belonging to the fourth layer X4 is the transmission source terminal, and the transmission data transmitted by the communication terminal 1-4F is It is assumed that the information is transmitted to communication terminals 1 within the range of layer X5. The data transmitter 133 of the communication terminal 1 transmits the transmission data received by the data receiver 131 when determining that the own terminal hierarchy matches any of the third hierarchy X3, the fourth hierarchy X4, and the fifth hierarchy X5. do.

On the other hand, when the data transmitting unit 133 of the communication terminal 1 determines that the own terminal hierarchy does not match any of the third hierarchy X3, the fourth hierarchy X4, and the fifth hierarchy X5, the data receiving unit 131 receives the data. Do not send transmission data. By operating the communication terminal 1 in this manner, the communication system S can reduce the power consumption of the communication system S while transmitting the transmission data to the range to which the transmission data is to be transmitted.

In FIG. 1, a case is illustrated in which the communication terminal 1 belonging to the destination layer (for example, the communication terminal 1 belonging to the fifth layer X5) does not transmit the received transmission data. However, the communication terminal 1 belonging to the destination layer transmits the transmission data, and the communication terminal 1 that received the transmission data from the communication terminal 1 belonging to the destination layer (for example, the communication terminal 1 belonging to the sixth layer X6) receives the transmission data. You may choose not to send it. That is, the data transmitter 133 transmits the received transmission data when the own terminal layer is between the source layer and the destination layer, or when the own terminal layer is the same as the destination layer, and otherwise In this case, the received transmission data is not transmitted.

In this case, the transmission data has an area indicating the source layer, and the data transmitting unit 133 of the communication terminal 1 that is the source of the transmission data transmits the transmission data with its own terminal layer included in the area indicating the source layer. You can also send it. By operating the communication system S in this manner, even if the destination terminal cannot receive transmission data from the communication terminal 1 in another layer (for example, the fourth layer Since the transmission data can be received from other communication terminals 1 belonging to X5), the probability that the destination terminal can receive the transmission data increases.

[Effects of communication system S]
As explained above, each of the plurality of communication terminals 1 included in the communication system S has a transmission destination hierarchy that is the transmission destination hierarchy indicated by the transmission destination information included in the transmission data received by the data receiving unit 131. It includes a destination layer specifying section 132 that specifies the destination layer, and a data transmitting section 133 that transmits the transmission data received by the data receiving section 131 on the condition that the destination layer is different from the own terminal layer. In this way, by the data transmitting unit 133 transmitting the transmission data on the condition that the destination layer is different from the own terminal layer, the transmission data is not transmitted when the communication terminal 1 does not need to transmit the transmission data. . As a result, the number of communication terminals 1 that transmit transmission data is reduced, so that the communication system S can reduce power consumption.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes can be made within the scope of the gist. be. For example, all or part of the device can be functionally or physically distributed and integrated into arbitrary units. In addition, new embodiments created by arbitrary combinations of multiple embodiments are also included in the embodiments of the present invention. The effects of the new embodiment resulting from the combination have the effects of the original embodiment.

1 Communication terminal 11 Communication unit 12 Storage unit 13 Control unit 131 Data reception unit 132 Destination layer identification unit 133 Data transmission unit 134 Data processing unit

Claims (5)

A communication system comprising a plurality of communication terminals belonging to any one of a plurality of hierarchies, in which one or more of the communication terminals belonging to the same hierarchy simultaneously transmit transmission data,
Each of the plurality of communication terminals includes:
a storage unit that stores a self-terminal hierarchy to which the self-terminal belongs;
a data receiving unit that receives the transmission data transmitted by another communication terminal among the plurality of communication terminals;
a destination hierarchy identifying unit that identifies a destination hierarchy that is a destination hierarchy indicated by destination information included in the transmission data received by the data receiving unit;
a data transmitting unit that transmits the transmission data received by the data receiving unit on the condition that the specified destination hierarchy is different from the own terminal hierarchy stored in the storage unit;
has
A source terminal among the plurality of communication terminals transmits the transmission data in which the transmission source terminal's own terminal hierarchy is included in an area indicating the transmission source hierarchy in the transmission data,
The data transmitting unit of the receiving terminal that has received the transmission data is configured to transmit the received transmission to The transmission data is transmitted when the transmission data is between the source layer and the destination layer included in the data, and the transmission data is between the source layer and the destination layer included in the transmission data received by the own terminal layer of the receiving terminal. A communication system that does not send transmitted data unless there is an interval . The data transmission unit transmits the transmission data on the condition that the own terminal hierarchy is closer to the destination hierarchy than the transmission source hierarchy to which the other communication terminal that has transmitted the transmission data received by the data reception unit belongs. send,
The communication system according to claim 1. The destination information includes range information that specifies a range of some communication terminals to which the transmission data is to be transmitted among the plurality of communication terminals included in the same layer,
The storage unit further stores information indicating the location of the own terminal,
The data transmitting unit transmits the transmission data on the condition that the position of the own terminal stored in the storage unit is included within a predetermined range from the range indicated by the range information.
The communication system according to claim 1 or 2. The destination information includes routing information indicating a route along which the transmission data is transmitted;
The storage unit further stores information indicating the location of the own terminal,
The data transmitting unit transmits the transmission data on the condition that the location of the own terminal stored in the storage unit is included in the routing information.
The communication system according to claim 1 or 2. A processor of the communication terminal included in a communication system including a plurality of communication terminals belonging to any one of a plurality of hierarchies, in which the communication terminals belonging to the same hierarchy simultaneously transmit transmission data,
a data receiving unit that receives the transmission data transmitted by another communication terminal among the plurality of communication terminals;
a destination hierarchy identifying unit that identifies a destination hierarchy that is a destination hierarchy indicated by destination information included in the transmission data received by the data receiving unit;
a data transmission unit that transmits the transmission data received by the data reception unit to another communication terminal in the next hierarchy, provided that the specified destination hierarchy is different from the hierarchy to which the communication terminal belongs;
function as
When the data receiving unit receives the transmission data in which the transmission source terminal among the plurality of communication terminals includes the own terminal hierarchy of the transmission source terminal in the area indicating the transmission source hierarchy in the transmission data, The data transmitting unit is configured to configure the data transmitting unit, in a case where the own terminal hierarchy of the communication terminal and the transmission source hierarchy indicated by the transmission data are different, that the own terminal hierarchy of the communication terminal is the transmission source hierarchy and the transmission destination included in the received transmission data. The communication terminal transmits the transmission data if it is between the source layer and the destination layer included in the transmission data received by the communication terminal's own terminal layer, and does not transmit the transmission data. ,
program.

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