TWI726324B - Communication terminal, communication system and recording medium - Google Patents

Abstract

The purpose of the present disclosure is to provide a communication terminal, communication system, and program that can reduce the possibility that the communication load is concentrated on a specific upper-level candidate. The communication terminal (100) is used in a communication system for a plurality of communication terminals (100) to perform multi-point hopping. The communication terminal (100) includes a communication unit (102) and a control unit (101) that controls the communication unit (102). The control unit (101) performs a selection process of selecting the upper communication terminal from the plurality of upper candidates based on the operating conditions of the lower communication terminals connected to each of the plurality of upper candidates.

Description

Communication terminal, communication system and recording medium

This disclosure relates to a communication terminal, communication system and program. In more detail, this disclosure relates to a communication terminal, communication system and program for multi-point hop communication.

Previously, there has been a communication system that performs multi-hop communication between a plurality of communication devices including a main unit and a plurality of slave units (for example, Japanese Patent Application Publication No. 2015-115643 (hereinafter referred to as "Document 1"). In this communication system, each The slave computer calculates the total cost of the path cost and the link cost, selects the terminal with the smallest total cost as the upper terminal, and communicates.

In the communication system of Patent Document 1, the terminal whose total cost of the path cost and the link cost of the slave unit selection becomes the smallest becomes the upper terminal. Therefore, a plurality of slave devices may choose a specific terminal (upper-level candidate) as the upper-level terminal (upper communication terminal), and the communication load may be concentrated on the specific upper-level terminal (upper-level communication terminal).

The purpose of the present disclosure is to provide a communication terminal, communication system, and program that can reduce the possibility that the communication load is concentrated on a specific upper-level candidate.

A communication terminal in one aspect of the present disclosure is the above-mentioned communication terminal of a communication system for a plurality of communication terminals to perform multi-point hop communication. The above-mentioned communication terminal includes a communication unit and a control The control unit of the above-mentioned communication unit. The control unit performs a selection process of selecting an upper communication terminal from the plurality of upper candidates based on the operating conditions of the lower communication terminals connected to each of the plurality of upper candidates.

A communication system of one aspect of the present disclosure includes a plurality of the above-mentioned communication terminals. Multi-point hop communication is performed between the above-mentioned plural communication terminals.

The program of one aspect of the present disclosure is a program for the computer system to execute the selection process of selecting the upper communication terminal from the plurality of upper candidates based on the operating conditions of the lower communication terminals connected to each of the plurality of upper candidates.

10: Mother machine

20~24: handset

100: Communication terminal (upper candidate, upper communication terminal, lower communication terminal)

101: Control Department

102: Ministry of Communications

103: Machine Interface

104: Memory Department

105: Memory Department

106~122: handset

124: Handset

125: handset

131: Handset

201~210: handset

300: control device

400: Machine

600: Communication system

S1~S3: steps

Fig. 1 is a system configuration diagram of a communication system including a communication terminal according to an embodiment of the present disclosure.

Figure 2 is a block diagram of the same communication terminal.

Fig. 3 is a flowchart illustrating the selection process of the same communication terminal.

Figure 4 is a system configuration diagram of the same communication system.

Fig. 5 is an explanatory diagram for explaining a selection process of a communication terminal in a modification 1 of an embodiment of the present disclosure.

Fig. 6 is an explanatory diagram for explaining a selection process of a communication terminal in a modification 4 of an embodiment of the present disclosure.

(Implementation form)

(1) Summary

Fig. 1 is an overview of a communication system 600 including a communication terminal 100 (refer to Fig. 2) of this embodiment Sketch map.

The communication system 600 of this embodiment is used, for example, in facilities such as factories and office buildings. A communication terminal 100 including a main machine 10 and a plurality of slave machines 20 is pre-installed in the facility, and the main machine 10 and the plurality of slave machines 20 are constituted by the communication terminal 100.

The main unit 10 and the plurality of slave units 20 perform multi-hop communication. Here, when the slave device 20 is distinguished by the number of jumps, the slave 20 with the jump number of 1 is described as the slave 21, the slave 20 with the jump number of 2 is described as the slave 22, and the number of jumps is The child machine 20 of 3 is recorded as 23, and the child machine 20 with a jumper number of 4 is recorded as the child machine 24. In addition, in order to identify each slave device 20 in the communication system 600, individual identification numbers are assigned to a plurality of slave devices 20 in advance. In FIG. 1, the identification numbers are displayed in a circle indicating the slave devices 20. In the following description, when describing the case of the individual slave 20, for example, the slave 21 (20) with the identification number "101" may be described as the slave 21 [101] or the slave 20 [101].

In the communication system 600 of the present embodiment, the control device 300 is connected to the parent machine 10, and the devices (for example, electrical equipment such as lighting equipment and air-conditioning equipment) 400 controlled by the control device 300 are connected to each of the child machines 20. In addition, in FIG. 1, the illustration of the device 400 is omitted for some of the slave devices 20.

Here, since the control signal output by the control device 300 is sent from the parent machine 10 to the child machine 20 connected to the machine 400 to be controlled, the machine 400 to be controlled can be made to act in accordance with the control signal. Therefore, in the communication system 600 of this embodiment, by connecting the control device 300 to the parent machine 10 and the control target machine 400 to the slave machine 20, a control system for the control machine 400 can be constructed. In addition, the communication system 600 is not limited to use in the control system. The monitoring device connected to the parent machine 10 can also be used in a data collection system that collects data from a machine connected to the slave machine 20, and a monitoring system that monitors the state of the machine connected to the slave machine 20. Wait. In addition, there is no need to connect all slaves 20 The machine 400 may not be connected to the machine 400 to some of the slave machines 20. The slave device 20 that is not connected to the device 400 functions as a repeater.

Fig. 2 is a block diagram of the communication terminal 100 of this embodiment. In this embodiment, the same communication terminal 100 is used for the main unit 10 and the sub unit 20. The communication terminal 100 functions as a parent unit 10 by setting it as a "parent unit" using a setting mechanism such as a jumper switch or a toggle switch, and functions as a slave unit 20 by setting it as a "slave unit".

The communication terminal 100 of this embodiment is used in a communication system 600 in which a plurality of communication terminals 100 perform multi-hop communication. The communication terminal 100 includes a communication unit 102 and a control unit 101 that controls the communication unit 102. The control unit 101 performs a selection process of selecting the upper communication terminal from the plurality of upper candidates based on the operating conditions of the lower communication terminals connected to each of the plurality of upper candidates.

The communication system 600 of this embodiment includes a plurality of communication terminals 100, and multipoint hop communication is performed between the plurality of communication terminals 100.

Here, the "upper communication terminal" of the communication terminal 100 (slave device 20) is connected to the upper communication terminal of the communication terminal 100 via the link 500. In a communication system 600 composed of a main unit 10 and a plurality of slave units 20, the communication terminal above a certain slave unit 20 is a communication terminal with a smaller number of jumpers than the slave unit 20 (that is, the main unit 10 side). In addition, the communication terminal below a certain sub-machine 20 is a communication terminal with a jumper number greater than that of the sub-machine 20. In the configuration example of FIG. 1, the slave device 22 [106] is the upper communication terminal system slave device 21 [102]. The "superior candidate" of the communication terminal 100 is a communication terminal that can become a higher-level communication terminal of the communication terminal 100, and is a communication terminal that can directly communicate with the communication terminal 100 among the communication terminals with a jumper number one less than that of the communication terminal 100 . For example, the upper candidate of the slave 22[106] is a slave 21 with a jumper of 1 that can directly communicate with the slave 22[106]. In addition, the "lower communication terminal" of the communication terminal 100 is connected to the The communication terminal below the communication terminal 100. In this embodiment, the lower-level communication terminal of the communication terminal 100 is a communication terminal that is connected to all the communication terminals under the communication terminal 100 and can directly communicate with the communication terminal 100. In the configuration example of FIG. 1, the sub-machine 22 [106] is the lower-level communication terminal system of the sub-machine 23 [111] and the sub-machine 23 [112]. In addition, connecting two communication terminals means that the two communication terminals are in a communicable state, and when the two communication terminals are performing wireless communication, the two communication terminals may not be physically connected. The "operation status" of the upper-level candidate lower-level communication terminal refers to information indicating how well one or more communication terminals 100 of the lower-level communication terminal operate, that is, how much communication is performed. The operating status of the upper-level candidate lower-level communication terminal is, for example, the actual operation performance of one of the lower-level communication terminals or a plurality of communication terminals 100 within a specific period (for example, the previous 1 to several minutes or so), that is, the actual communication performance Information about the number of terminals (operation number) of the lower communication terminal. In addition, the operation status of the upper-level candidate and lower-level communication terminal may also be an index that evaluates the operation status of one or more communication terminals 100 of the lower-level communication terminal (for example, operation time, operation rate, operation frequency in a specific period) Etc.) related information.

In the communication terminal 100 of this embodiment, since the upper communication terminal is selected from a plurality of upper candidates based on the operating conditions of the lower communication terminal, the possibility that a specific upper candidate (communication terminal 100) is selected as the upper communication terminal can be reduced . Therefore, it is possible to reduce the possibility of concentrating on the specific higher candidate (communication terminal 100) and connecting to the lower communication terminal, and reduce the possibility of the communication load being concentrated on the specific higher candidate. In addition, since the upper communication terminal is selected based on the operation status of the lower communication terminal, the lower communication terminal can be selected to be inactive (for example, there are fewer lower communication terminals in operation) and the upper communication terminal can be reduced, so the communication load can be reduced. Possibility of specific superior candidates. In addition, in the following description, the number of lower-level communication terminals of a certain communication terminal 100 is also referred to as the number of lower-level terminals.

Here, when the communication frequency between the lower communication terminal and the upper candidate connected to the upper candidate is low, the upper candidate does not need to memorize the communication conditions related to the communication of the lower communication terminal (such as modulation method, etc.), which can be reduced Consumption of resources. Therefore, when the number of lower communication terminals is the same in a plurality of higher-level terminals, the fewer the number of lower-level communication terminals during operation, the less the upper-level candidates, the less resource consumption. Thereby, the control unit 101 of the communication terminal 100 also has the advantage that if the upper candidate with a smaller number of operations is selected based on the operation number information, the upper candidate with less resource consumption can be selected.

(2) Details

(2.1) Composition

The communication terminal 100 of this embodiment, as shown in FIG. 2, includes a control unit 101, a communication unit 102, a machine interface 103, and a storage unit 104.

The control unit 101 is a person who controls the overall operation of the communication terminal 100 and controls the communication of the communication unit 102. The control unit 101 is constituted by, for example, a microcomputer having a processor and a memory. That is, the control unit 101 is realized by a computer system having a processor and a memory. In addition, the computer system functions as the control unit 101 by the processor executing a specific program. The program executed by the processor can be pre-recorded in the memory 104, or provided through an electrical communication line such as the Internet, or recorded on a non-temporary recording medium such as a memory card.

The communication unit 102 is a communication interface used to communicate with other communication terminals 100. As an example, the communication unit 102 uses a power line as a communication line, and is a communication interface of a power line communication method (PLC: Power Line Communication) in which a signal is superimposed on the power line. The communication terminal 100 of this embodiment is used by connecting to a power outlet installed in a facility. Therefore, the communication terminal 100 can communicate with other communication terminals 100 connected to the power line installed in the facility by using the power line installed in the facility as a communication line. Also, communication The unit 102 is not limited to communicating in the power line transmission communication method, and may also be a communication interface that communicates in a wired communication method other than the power line transmission communication method, or may be a communication interface that communicates in a wireless communication method.

The machine interface 103 is an interface used to exchange (input and output) data with the control device 300 or the machine 400 connected to the communication terminal 100. The machine interface 103 is, for example, a communication interface that complies with the specifications of Ethernet (registered trademark).

The memory 104 is a non-temporary recording medium, including non-volatile memory such as ROM (Read-Only Memory), and EEPROM (Electrically Erasable Programmable Read-Only Memory), which is electrically erasable and programmable read-only memory. ) Isoelectric rewritable non-volatile memory, RAM (Random Access Memory, random access memory) and other volatile memory, etc. The storage unit 104 stores the communication path and the link information related to the communication terminal that can communicate (the other communication terminal 100 that can directly communicate). The storage unit 104 also stores programs such as control programs for operating the communication terminal 100, and information required for executing the programs.

In the communication system 600 of the present embodiment, a unique identification number is assigned to each of the parent machine 10 and the child machine 20, and the memory unit 104 of each communication terminal 100 also stores the identification number allocated to its own terminal. In addition, each communication terminal 100 is pre-allocated with a device ID such as a serial number (manufacturing number) or a MAC address, and the device ID is stored in the memory 104 of each communication terminal 100 in advance. The communication packet sent and received by the communication terminal 100 completes the passage control by adding the device ID.

(2.2) Action

Next, the operation of the communication system 600 of this embodiment will be described.

The parent machine 10 and the slave machine 20, for example, follow the active path protocol and select the communication path The information of the communication path is stored in the memory 104 of the parent machine 10 and the slave machine 20. In addition, the path protocol adopted by the communication system 600 is not limited to the active type, and may also be a CMSR (Centralized Metric based Source Routing, multi-path source routing protocol) or a reactive type protocol.

In the configuration example of Fig. 1, when the master machine 10 sends transmission data including control data to the slave machine 23 [110], the transmission data sent from the master machine 10 passes through the slave machine 21 [101] and the slave machine 22 [105], Send to handset 23[110]. In this way, the parent machine 10 can also send data to the slave machine 23 [110] that is not in direct communication, and the communication range can be expanded.

The base unit 10 and the sub unit 20 regularly broadcast and send Hello packets (Hello Packets, also referred to as "H packets), and exchange link information and other information with the surrounding communication terminals 100. The H packets are each communication terminal 100 reporting itself to other communication terminals 100 The communication packet for the existence of the terminal. In addition, in the H packet sent by the communication terminal 100 that becomes the slave device 20, the communication path information indicating the communication path from the own terminal to the master device 10 and the path quality indicating the communication quality of the communication path are contained Information, etc. The communication path information includes, for example, the identification number of the communication terminal 100 passing through the communication path from the slave device 20 to the parent device 10. The path quality information is information indicating the communication quality of the communication path, for example, based on the SN ratio, communication The value of speed, bit error rate, or packet error rate, etc. The master unit 10 and the slave unit 20 can update the communication path based on the H packet periodically sent from the surrounding communication terminal 100. Here, the H packet includes the terminal connected to itself The number of operations related to the number of terminals (number of operations) that operate (e.g. send or receive data) during a specific period (e.g., the previous 1 to several minutes) of other communication terminals 100 (lower-level communications terminals) that can directly communicate Information. In addition, the H packet may also include terminal number information related to the number of terminals of other communication terminals 100 (lower-level communication terminals) connected to its own terminal and capable of direct communication.

Here, the operation in the case where a new slave device 20 logs in to the communication system 600 will be described with reference to FIGS. 1 and 3.

In the newly logged-in slave device 20 (the slave device 20 whose identification number is "115" after logging in), the communication unit 102 receives the H packet broadcasted from the slave device 20 (upper candidate) existing in the communicable range. The control unit 101 obtains the operation number information contained in the H packet transmitted from the slave device 20 of the upper candidate via the communication unit 102 (S1). For example, when the slave unit 20 [115] can directly communicate with the slave unit 22 [107] and the slave unit 22 [108], the control unit 101 of the slave unit 20 [115] sets the slave unit 22 [107] and the slave unit 22 [108] As an upper-level candidate, obtain information on the number of operations.

In addition, the control unit 101 of the slave 20 [115] selects the slave 20 with the least number of operations of the lower communication terminal as the upper communication based on the operation number information obtained from the upper candidate slave 22 [107] and the slave 22 [108] Terminal selection process (S2). For example, if the number of operations of the lower communication terminal connected to the slave 22 [107] is 20, and the number of operations of the lower communication terminal connected to the slave 22 [108] is 10, the control unit 101 of the slave 20 [115] selects The slave 22 [108] serves as the upper communication terminal. In addition, the control unit 101 of the slave device 20 [115] executes the log-in process to the communication network constituted by the communication system 600 to the slave device 22 [108] (S3). In addition, in the present embodiment, the so-called login process includes the process in which the new slave machine 20 logs in to the communication network, and the process in which the slave machine 20 that has logged in to the communication network switches the upper communication terminal to log in to the communication network again.

In this way, in the present embodiment, when a new slave device 20 logs in to the communication system 600, the control unit 101 of the slave device 20 (communication terminal 100) selects one of the lower communication terminals from among the plurality of upper candidates (the slave device 20). The upper-level candidate with a small number of operations serves as a higher-level communication terminal. Therefore, it is possible to reduce the possibility that the lower-level communication terminals in the operating state are collectively connected to the specific upper-level candidates (communication terminal 100). Thereby, it is possible to reduce the possibility that the communication load is concentrated on the specific upper candidate (communication terminal 100).

Here, the control unit 101 of each slave 20 (communication terminal 100) selects from among a plurality of upper-level candidates, based on the number of operations of the lower-level communication terminals connected to the lower-level candidates. Processing, but the number of operations of the lower-level communication terminal is not limited to the number of operations in the last specific period. For example, the control unit 101 of each slave 20 (communication terminal 100) may perform selection processing based on the representative value of the number of operations during a specific use period. The term of use refers to, for example, a period in which the day is the interval, and is a period ranging from a few hours to tens of hours. In this case, the control unit 101 of each slave 20 (communication terminal 100) memorizes data on the number of operations during the use period, and performs selection processing based on the representative value (for example, the maximum value) of the number of operations during the use period. For example, the control unit 101 of each slave 20 (communication terminal 100) selects a plurality of higher-level candidates from a plurality of higher-level candidates, and selects the maximum value of the number of operations during the use period as the smallest higher-level candidate as the upper-level communication terminal. In addition, among a plurality of upper-level candidates, if there is a situation where the maximum value of the number of operations during the use period is the smallest, the control unit 101 of each slave 20 (communication terminal 100) only needs to take the average of the number of operations during the use period The smaller value is determined as the upper communication terminal for priority.

Thereby, the control unit 101 of each slave 20 (communication terminal 100) can more accurately grasp the operating status of the lower communication terminal connected to the upper candidate and select the upper communication terminal, which can reduce the communication load and concentrate on the specific upper Possibility of communication terminal. Here, the representative value of the number of operations during a specific use period is not limited to the maximum value, as long as it is at least one of the maximum value, the average value, and the median value.

In addition, in this embodiment, the control unit 101 of the slave device 20 (communication terminal 100) performs selection processing based on the operating status of a plurality of upper-level candidate and lower-level communication terminals. However, other than the operating status of the upper-level candidate and lower-level communication terminals may also be considered. The elements are selected for processing.

For example, in the selection process described above, the control unit 101 of the slave device 20 (communication terminal 100) may perform the selection process based on the first operating status and the second operating status. The first operating status is the operating status (for example, the number of operations) in which the own terminal can directly communicate with the upper candidate lower communication terminal. The second operating condition is that a plurality of upper-level candidates are connected, and the number of jumpers is less than this The operation status (for example, the number of operations) of the lower communication terminal below the upper candidate upper communication terminal.

In the configuration example of Fig. 1, when the slave device 20[115] selects the upper communication terminal, the slave device 21[102] is connected to the upper candidate device 22[107], and the slave device 22[102] is connected to the upper candidate device 22[107] 108] The upper position connects to the slave 21 [103].

Therefore, the control unit 101 of the slave device 20 [115] is based on the number of operations (the first operation number) of the lower communication terminal of the slave device 22 [107] and the slave device 22 [108], the slave device 21 [102] and For the slave 21 [103] the operation number of the lower communication terminal (the second operation number), the upper communication terminal is selected.

For example, the control unit 101 of the slave unit 20 [115] compares the total value N1 of the first operation number of the slave unit 22 [107] and the second operation number of the slave unit 21 [102] with the first operation number of the slave unit 22 [108] The number of operations is compared with the total value N2 of the second number of operations of the slave 21 [103]. For example, when the total value N1 is less than the total value N2, the control unit 101 of the slave 20[115] selects the slave 22[107] as the upper communication terminal, and when the total value N2 is less than the total value N1, selects the slave 22[108] as the upper communication terminal. In addition, the control unit 101 of the slave unit 20 [115] may also be based on the average value of the first operation number of the slave unit 22 [107] and the second operation number of the slave unit 21 [102], and the difference between the slave unit 22 [108] Select the upper communication terminal for the average value of the first operation number and the second operation number of the slave 21 [103]. In addition, the control unit 101 of the slave 20 [115] may select the upper communication terminal by comparing the values obtained by weighting the first operation number and the second operation number. For example, when α is set to a positive coefficient less than 1, the control unit 101 of the slave 20 [115] only requires [(the first number of operations)×α+(the second number of operations)×(1-α) ] Value, select the upper communication terminal based on this value.

In this way, the control unit 101 of the communication terminal 100 performs selection processing based on the first and second numbers of operations, thereby reducing the concentration of lower-level communication terminals on specific ones during operation. Possibility to connect to the upper communication terminal. In this way, the possibility that the communication load is concentrated on a specific upper-level communication terminal can be reduced.

In addition, in the above description, the operation of the case where the new slave 20 logs into the communication system 600 has been described, but the slave 20 that has logged into the communication system 600 can also use the operating conditions of other slaves 20 as a trigger to perform The selection process of selecting the upper communication terminal.

The control unit 101 of the communication terminal 100 executes the selection process when the parameter related to whether the upper communication terminal needs to be changed exceeds the judgment value. The parameter is, for example, the number of operations of the upper communication terminal and the lower communication terminal connected to the communication terminal 100. The control unit 101 of the communication terminal 100 executes the selection process when the number of operations of the upper communication terminal and the lower communication terminal connected to the communication terminal 100 exceeds a specific upper limit (determination value) as a trigger.

For example, as shown in Figure 4, when the slave 23[115] is connected to the lower position of the slave 22[108], if the upper communication terminal, that is, the operation number of the lower communication terminal of the slave 22[108] exceeds the specified upper Limit value, the control unit 101 of the slave 23 [115] executes the selection process. The control unit 101 of the slave unit 23 [115] periodically obtains the H packet from the other slave unit 20 (upper candidate) that can directly communicate via the communication unit 102. Based on the number of operations information contained in the H packet, the upper position is determined from the plurality of upper candidates Communication terminal. When the control unit 101 of the slave 23[115] selects the slave 20 other than the current upper communication terminal (slave 22[108]) as the upper communication terminal as a result of the selection process, it will select the slave as the upper communication terminal 20 Perform login processing. Thereby, even when the status of the upper communication terminal is changed by the slave device 20 that has logged in the communication system 600, the possibility of concentrating on the specific upper candidate to connect to the lower communication terminal can be reduced. In this way, the possibility that the communication load is concentrated on a specific upper candidate can be reduced.

In addition, in this embodiment, the operation number information related to the operation number of the lower-level communication terminal is included in the H packet, and the control unit 101 of each communication terminal 100 (slave device 20) is based on the self-complex number. Each of the upper-level candidates performs selection processing through the operation number information obtained by the communication unit 102.

Since the control unit 101 of each communication terminal 100 (slave device 20) performs selection processing based on the number of operations information obtained from the upper candidate, it is possible to surely select the number of lower communication terminals (the number of operations) to operate and the upper candidate is smaller.

In addition, in this embodiment, each communication terminal 100 (slave machine 20) and other communication terminals 100 (slave machine 20) with which the communication unit 102 can directly communicate share information (operation number information) indicating the operation number of the lower communication terminal ). The control unit 101 of each communication terminal 100 (slave unit 20) can perform selection processing based on the operating number information shared by other communication terminals 100 that can directly communicate with the communication unit 102, and can more accurately grasp the lower-level communication for a plurality of upper-level candidates The number of operations of the terminal.

In addition, in the present embodiment, the H packet sent from each of the plurality of upper candidates contains the operation number information. Instead of using a dedicated communication packet, the operation number information is transmitted using the H packet, so the communication traffic can be reduced.

(3) Variations

The above-mentioned embodiment is only one of various embodiments of the present disclosure. As long as the purpose of cost disclosure can be achieved, the above-mentioned embodiment can be modified in various ways according to the design and the like. In addition, the same functions as the communication system 600 can also be implemented in a routing method of the communication terminal 100, a computer program, or a non-temporary recording medium on which the program is recorded. One aspect of the path selection method of the communication terminal 100 includes selection processing, which selects the upper communication terminal from the plurality of upper candidates based on the operating conditions of the lower communication terminals connected to each of the plurality of upper candidates. One aspect of the program is a program for the computer system to execute the selection process of selecting the upper communication terminal from the plurality of upper candidates based on the operating conditions of the lower communication terminals connected to each of the plurality of upper candidates.

Hereinafter, a modified example of the above-mentioned embodiment will be cited. The modified examples described below can be appropriately combined and applied.

The execution body of the communication terminal 100 or the route selection method of the communication terminal 100 of the present disclosure includes a computer system. The computer system takes the processor and memory as the hardware as the main components. The processor executes the program recorded in the memory of the computer system to realize the function as the execution subject of the communication terminal 100 or the route selection method of the communication terminal 100 of the present disclosure. The program can be pre-recorded in the memory of the computer system, can be provided through an electrical communication line, or can be recorded on a non-temporary recording medium that can be read by the computer system. Non-temporary recording media that can be read by computer systems are memory cards, optical discs, hard disk drives, etc. The processor of a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). Here, although it is called IC or LSI, the method of calling varies according to the degree of integration, and it may also be called system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Large integrated circuit). The field programmable gate array (FPGA) that is programmed after the LSI is manufactured, or the reconfiguration of the internal connection of the LSI or the reconfigurable logic device that can set the circuit block inside the LSI can also be used. A plurality of electronic circuits can be assembled on one chip or distributed on a plurality of chips. Multiple chips can be collected in one device or distributed in multiple devices.

In addition, in the above-mentioned embodiment, the communication terminal 100 is realized by one device housed in one housing, but at least one function of the communication unit 102 and the control unit 101 included in the communication terminal 100 can also be distributed in two Above the shell.

In the above embodiment, the communication system 600 is used in the control system, but it is not limited to the communication system 600 being used in the control system. The communication system 600 can also be used in a data collection system that allows the monitoring device connected to the slave machine 10 to collect data from the machine connected to the slave machine 20, a monitoring system that monitors the state of the machine connected to the slave machine 20, and the like.

In the above-mentioned embodiment, the comparison of the two values of the number of operations of the lower-level communication terminal, etc. In the case of "above", it can also be "greater than". In other words, whether or not the two-value equality is included in the binary comparison can be arbitrarily changed according to the setting of the reference value, etc., so there is no technical difference between "above" or "greater than". Similarly, when it is called "below", it may also be "less than".

(3.1) Variation example 1

The difference between the communication terminal 100 of Modification 1 and the above-mentioned embodiment is that the control unit 101 further performs the above-mentioned selection process based on the communication quality of the communication with each of the plurality of higher-level candidates. In addition, since the configuration of the communication terminal 100 and the communication system 600 of Modification 1 is the same as that of the above-mentioned embodiment, the same components are denoted by the same reference numerals, and their description is omitted.

The control unit 101 of the slave device 20 (communication terminal 100) periodically obtains H packets from the plurality of slave devices 20 (communication terminal 100) existing in the direct communication range via the communication unit 102. Here, the H packet includes operation number information related to the operation number of the lower-level communication terminal, and path quality information indicating the communication quality of the communication path.

In the communication terminal 100 of Modification 1, when the control unit 101 of the slave device 20 performs the selection process of selecting the above-mentioned communication terminal, it compares the path quality information obtained from the upper candidate, that is, the plurality of slave devices 20, and the specific threshold value. Compare the high and low, and choose a candidate. In addition, the control unit 101 of the slave device 20 selects the upper communication terminal from one candidate based on the operation number information related to the operation number of the lower communication terminal.

For example, as shown in Figure 5, for the slave 23 [115] from the slave 22 [105], the slave 22 [106], the slave 22 [107], the slave 22 [108] and the slave 22 [109] In the case of selecting a higher-level communication terminal, the selection process will be described. In Figure 5, the links to the slave 22[105], the slave 22[106], the slave 22[107], the slave 22[108], the slave 22[109] and the slave 23[115] respectively Next to 501, there is an evaluation value indicating communication quality. Here, the smaller the evaluation value recorded next to the link 501, the higher the communication quality of the link 501.

When the control unit 101 of the slave device 23 [115] performs the selection process of selecting the upper communication terminal from a plurality of upper candidates, first, select the communication quality of the slave device 20 of the upper candidate to be higher than the threshold value, that is, select communication The evaluation value of the quality is the upper candidate below the specific evaluation standard value, as a candidate. For example, the control unit 101 of the slave 23 [115] selects the evaluation value of the communication quality as the slave 22 [106], the slave 22 [107], and the slave 22 [108] below the evaluation reference value (for example, "10"), As an alternate.

In addition, the control unit 101 of the slave device 23 [115] selects the one with the smaller number of operations of the lower communication terminal as the upper communication terminal from one candidate selected based on the communication quality based on the operation number information contained in the H packet.

In this way, in the communication terminal 100 of Modification 1, the control unit 101 further performs a selection process based on the communication quality of each of the plurality of higher-level candidates, so the upper-level communication terminal can be selected in consideration of the communication quality. Therefore, it is possible to reduce the possibility that a higher-level candidate whose communication quality is relatively poor is selected as a higher-level communication terminal.

Here, in the communication terminal 100 of Modification 1, the control unit 101 selects the upper communication terminal from among a plurality of upper candidates whose communication quality is greater than or equal to the threshold value based on the operating status of the lower communication terminal. In other words, in Modification 1, a plurality of higher-level candidates are grouped according to communication quality, and based on operating conditions, a higher-level communication terminal is selected from a group of one-time candidates whose communication quality is greater than the threshold value among the plurality of higher-level candidates. Therefore, it is possible to reduce the possibility that the communication load is concentrated on a specific higher-level communication terminal, and the higher-level candidate with a communication quality above the threshold can be selected as the upper-level communication terminal.

In addition, in Modification 1, the threshold of communication quality is not limited to one. During the selection process, the control unit 101 of the communication terminal 100 may also gradually lower the threshold value until the upper communication terminal can be selected.

For example, when one or a plurality of higher-level candidates selected as one-time candidates does not have the number of lower-level communication terminals below the preset upper limit value, the control unit 101 gradually reduces the threshold of communication quality Value, increase the number of high-ranking candidates selected as one-time candidates. In addition, the control unit 101 selects the upper communication terminal from among the higher candidates selected as the primary candidate based on the number of lower communication terminals. In this way, the control unit 101 of the communication terminal 100 can select the slave device 20 whose number of lower-level communication terminals is less than the upper limit and with good communication quality as the upper-level communication terminal.

(3.2) Variation 2

In the communication terminal 100 of the above-mentioned embodiment, if the parameter related to whether the upper communication terminal needs to be changed exceeds the judgment value, the control unit 101 executes the selection process. For example, when the parameter related to the need to change the upper communication terminal is the degree of deterioration of the communication quality, if the degree of deterioration of the communication quality exceeds the judgment value, the control unit 101 executes a change process for changing the upper communication terminal.

Here, the difference between the communication terminal 100 of Modification 2 and the above-mentioned embodiment is that when the number of communication terminals connected to the lower-level communication terminal of its own terminal exceeds the reference number, the communication terminal 100 is higher than the number of lower-level communication terminals connected to its own terminal. If the number of terminals is less than the standard number, the judgment value will be increased. In addition, since the configuration of the communication terminal 100 and the communication system 600 of Modification 2 is the same as that of the above-mentioned embodiment, the same components are denoted by the same reference numerals and their description is omitted.

If the number of lower-level communication terminals exceeds the reference number of slave devices 20, the upper-level communication terminal is changed, and the number of lower-level communication terminals and the operating conditions of the lower-level communication terminals on the changed side may change significantly, and there may be a communication load due to the influence. The possibility of higher-level communication terminal in the change end.

Therefore, in the communication terminal 100 of Modification 2, the control unit 101 sets the judgment value to be the case where the number of lower-level terminals of its own terminal exceeds the reference number of terminals, and the case where the number of lower-level terminals of the own terminal is higher than the number of lower-level terminals of the own terminal is less than the reference number. , It is not easy to perform the selection process of the upper communication terminal. Therefore, by changing the upper-level communication terminal, it is possible to reduce the influence of the communication terminal 100 whose number of lower-level communication terminals exceeds the reference number on other communication terminals 100.

In addition, the control unit 101 of the communication terminal 100 may also set the above-mentioned judgment value to the case where the number of hops of the lower communication terminal connected to its own terminal coincides with the maximum number of hops, which is higher than that of the lower communication terminal connected to its own terminal. The number of jumpers is less than the maximum number of jumpers. Here, the so-called maximum number of hops refers to the upper limit of the number of hops allowed in the communication system 600, and is a value determined according to the system configuration of the communication system 600 and the like.

If the control unit 101 of the communication terminal 100 sets the judgment value to be higher than or less than the maximum number of hops when the number of hops of the lower communication terminal connected to its own terminal is consistent with the maximum number of hops, then the upper communication The selection process of the terminal becomes difficult to execute. Therefore, it is not easy to change the number of hops of the lower communication terminal connected to the communication terminal 100 due to the communication terminal 100 changing the upper communication terminal, and the possibility that the hop number of the lower communication terminal exceeds the maximum hop number can be reduced.

(3.3) Variation 3

In the communication terminal 100 of Modification 3, the control unit 101 estimates the number of operations of the lower communication terminal for each of the plurality of upper candidates, and performs selection processing based on the estimation result of the number of operations, which is different from the above-mentioned embodiment. In addition, since the configuration of the communication terminal 100 and the communication system 600 of Modification 3 is the same as that of the above-described embodiment, the same components are denoted by the same reference numerals, and their description is omitted.

In the communication system 600 of the above-mentioned embodiment, the communication terminals 100 use power to each other Wire transmission communication method for communication. Here, if the operating number of the lower communication terminal connected to the lower candidate exceeds the allowable number, the communication speed is set to a low speed even though the communication quality (for example, the S/N ratio) is good. Therefore, the control unit 101 of the communication terminal 100 (slave device 20) estimates the communication speed of the upper candidate based on the path quality information contained in the H packet periodically or irregularly transmitted by the other communication terminal 100 of the higher candidate. Also, if the estimated value of the communication speed estimated from the communication quality is lower than the actual communication speed, the control unit 101 of the communication terminal 100 (slave 20) determines that the number of operations of the lower communication terminal connected to the upper candidate exceeds the allowable value.

In addition, the control unit 101 of the communication terminal 100 selects the upper communication terminal based on the number of operations of the lower communication terminals connected to the lower candidates from among a plurality of upper candidates, which can reduce the possibility that the communication load is concentrated on a specific upper candidate . In addition, since the control unit 101 of the communication terminal 100 estimates the operation number of the lower communication terminal connected to the lower candidate based on the communication speed and communication quality of the upper candidate, there is no need to obtain the operation number information from the upper candidate. As a result, according to Modified Example 3, the upper candidate does not need to send the operation number information, and there is an advantage that the communication traffic can be reduced.

(3.4) Variation 4

In the communication terminal 100 of Modification 4, the content of the selection process performed by the control unit 101 of each communication terminal 100 is different from the above-mentioned embodiment. In addition, since the configuration of the communication terminal 100 and the communication system 600 of Modification 4 is the same as that of the above-mentioned embodiment, the same components are denoted by the same reference numerals and their description is omitted.

For example, as shown in Fig. 6, by turning on the power of a plurality of (for example, 10) slave machines 23 (23[201], 23[202],...23[210]) at the same time, the slave machines 23 can be connected at the same time. The operation of logging in to the communication system 600 will be described.

Each slave 23 (communication terminal 100) selects the choice of the upper communication terminal In a reasonable situation, the control unit 101 of each slave device 23 selects a plurality of primary candidates from among a plurality of upper-level candidates based on the operating status of the lower-level communication terminal. Here, when the slave units 22[107], 22[108] are selected as the primary candidates, the control unit 101 of each slave unit 23 is further based on the settings in the plural primary candidates, namely, the slave units 22[107], 22[108] Probability of each person's choice, select processing.

For example, the control unit 101 of each slave device 23 sets the selection probability based on the path quality information (path cost, etc.) contained in the H packet, and based on the reciprocal of the path communication quality of the slave devices 22[107] and 22[108]. In this way, among a plurality of high-level candidates, the lower the path cost, the higher the selection probability of the high-level candidate. Therefore, the control unit 101 of each slave device 23 selects any one of the slave devices 22[107], 22[108] by the upper communication terminal according to the selection probability, thereby allowing the plurality of slave devices 23 to select the slave device 20 as the upper communication candidate. Disperse according to the probability of selection. Thereby, it is possible to reduce the possibility that the specific higher-level candidate is selected as the upper-level communication terminal, and it is possible to reduce the possibility that the communication load is concentrated on the specific upper-level candidate.

In addition, in Modification 4, the control unit 101 of each slave 23 (communication terminal 100) may also pass a specific wait when the event (such as turning on the power) has occurred since it became the trigger to start the selection process of the upper communication terminal After time, the selection process is executed. In addition, the situation that becomes the trigger to start the selection process is not limited to turning on the power of the communication terminal 100. For example, the communication quality of the communication with the upper communication terminal may deteriorate, or the communication with the above-mentioned communication terminal may not be possible.

If the control unit 101 of each slave device 23 executes the selection process at the same time, the control unit 101 of each slave device 23 has the possibility of selecting the same slave device 22[107], thereby performing the selection process again, so it is determined that the upper position It may take time until the communication terminal.

Here, if each of the plurality of sub-machines 23 is set to a time with a different waiting time as described above, the time points when the control unit 101 of each sub-machine 23 executes the selection process can be dispersed, so it can be shortened to the control unit of each sub-machine 23 101 determines the time until the upper communication terminal.

In addition, the control unit 101 of the plurality of slave devices 23 may perform selection processing to determine the upper communication terminal, and then reconfirm the operation status of the lower communication terminal connected to the upper communication terminal of the change end, and determine again whether to perform the upper communication The login process of the upper candidate determined by the terminal. Thereby, since the control unit 101 of each slave 23 confirms the operating status of the lower communication terminal immediately before the login process, it can perform the login process of the upper candidate determined by the upper communication terminal, so the communication load can be reduced. The possibility of specific upper-level communication terminals.

Here, the above-mentioned waiting time is preferably set based on the difference between the communication quality of the higher-level communication terminal in the selection and the communication quality of the higher-level communication terminal of the switching end.

For example, the control unit 101 of each slave 23 only needs to be set so that the difference between the communication quality of the upper communication terminal in the selection and the communication quality of the switching end of the upper communication terminal in the case of switching the upper communication terminal is smaller, and the waiting time is shorter Time is fine. Accordingly, even if the upper communication terminal is changed, the slave device 23 whose communication quality does not change much changes the upper communication terminal early, so the slave device 23 whose communication quality deteriorates due to the change of the upper communication terminal may not be changed to the upper communication terminal. Thereby, each slave 23 (communication terminal 100) of the entire system of the communication system 600 can select the communication terminal 100 with good communication quality as the upper communication terminal.

In addition, when the communication quality greatly changes due to the change of the upper communication terminal, the slave device 23 that changes in the direction of better communication quality can also set the waiting time to a short time, and the communication terminal 100 with good communication quality can be selected as the upper communication terminal .

(3.5) Variation example 5

In the above-mentioned embodiment, the upper-level candidate and lower-level communication terminals are connected to the upper-level candidates and lower-level communication terminals that can directly communicate with the upper-level candidates. However, in Modification 5, all communication terminals connected to the lower-level candidates are connected. For example, in the configuration example in Figure 1, the slave 22[106] communicates under The terminal includes a slave 23[111] and a slave 23[112], and a slave 24[120] connected to the slave 23[111].

The control unit 101 of the slave device 20 (communication terminal 100) selects the upper-level communication terminal from the plurality of upper-level candidates based on the operating status of the lower-level communication terminals connected to each of the plurality of upper-level candidates Communication terminal. Therefore, the control unit 101 of each slave device 20 can consider the operating conditions of all the lower communication terminals connected to the upper candidate and select the upper communication terminal to reduce the possibility that a specific upper candidate is selected as the upper communication terminal.

to sum up

As explained above, the communication terminal (100) of the first aspect is the communication terminal (100) of the communication system (600) for a plurality of communication terminals (100) to perform multi-hop communication. The communication terminal 100 includes a communication unit (102) and a control unit (101) that controls the communication unit (102). The control unit (101) performs a selection process of selecting the upper communication terminal (100) from the plurality of upper candidates (100) based on the operating status of the lower communication terminal (100) connected to each of the plurality of upper candidates (100).

According to this aspect, since the control unit (101) selects the upper communication terminal (100) from a plurality of upper candidates (100) based on the operating status of the lower communication terminal (100), the specific upper candidates (100) can be reduced The possibility of being selected as the upper communication terminal (100).

The communication terminal (100) of the second aspect is in the first aspect. The control unit (101) represents the lower communication terminal (100) obtained from each of the plurality of upper candidates (100) via the communication unit (102). The operation number information of the operation number is selected for processing.

According to this aspect, by performing selection processing based on the operation number information obtained from the upper candidate (100), the operation number of each upper candidate (100) and lower communication terminal can be grasped, so that the specific upper candidate (100) can be reduced The possibility of being selected as the upper communication terminal (100).

The communication terminal (100) of the third aspect is in the second aspect, and the operation number information is shared with other communication terminals (100) that can directly communicate with the communication unit (102).

According to this aspect, since the operation number information is shared with other communication terminals (100) that can directly communicate with the communication unit (102), it is possible to more accurately grasp the operation of the upper candidate (100) and the lower communication terminal (100) number.

The communication terminal (100) of the fourth aspect is in the second aspect, and the Hello packet sent from each of the plurality of higher-level candidates (100) includes operation number information.

According to this aspect, compared with the case where the operation data information is sent in a dedicated communication packet, the communication traffic can be reduced.

The communication terminal (100) of the fifth aspect is in the first aspect. The control unit (101) estimates the number of operations of the lower communication terminal (100) for each of the plurality of upper-level candidates (100), based on the estimation of the number of operations The result is selected for processing.

According to this aspect, since there is no need to receive information indicating the operating status of the lower communication terminal (100) from the upper candidate (100), the communication traffic can be reduced.

The communication terminal (100) of the sixth aspect is in any of the second to fifth aspects, and the control unit (101) performs selection processing based on the representative value of the number of operations during a specific use period.

According to this aspect, it is possible to more accurately grasp the operating status of the lower communication terminal (100) connected to the lower position of the upper candidate (100).

The communication terminal (100) of the seventh aspect is in any of the first to sixth aspects, and the lower communication terminal (100) is a communication terminal (100) with which the upper candidate (100) can directly communicate.

According to this aspect, it is possible to reduce the possibility that the specific upper candidate (100) is selected as the upper communication terminal (100).

The communication terminal (100) of the eighth aspect is in any one of the first to sixth aspects, the lower The communication terminal (100) is connected to all the communication terminals (100) below the upper candidate (100).

According to this aspect, it is possible to reduce the possibility that the specific upper candidate (100) is selected as the upper communication terminal (100).

The communication terminal (100) of the ninth aspect is in any of the first to eighth aspects, and the control unit (101) further performs selection processing based on the communication quality of the communication with each of the plurality of upper-level candidates (100).

According to this aspect, the higher-level candidate (100) with good communication quality can be selected as the higher-level communication terminal (100).

The communication terminal (100) of the tenth aspect is one of the first to ninth aspects. The control unit (101) selects the upper communication terminal ( 100). The specific candidate is a high-level candidate (100) whose communication quality is higher than the threshold value (100) among a plurality of high-level candidates (100).

According to this aspect, the higher-level candidate (100) with good communication quality can be selected as the higher-level communication terminal (100).

The communication terminal (100) of the eleventh aspect is in the tenth aspect. In the selection process, the control unit (101) gradually reduces the threshold value until the upper communication terminal (100) can be selected.

According to this aspect, the higher-level candidate (100) with good communication quality can be selected as the higher-level communication terminal (100).

The communication terminal (100) of the twelfth aspect is in any one of the first to eleventh aspects, and the control unit (101) executes selection processing when the parameter related to whether the upper communication terminal (100) needs to be changed exceeds the judgment value. The control unit (101) sets the judgment value as the case where the number of terminals connected to the lower communication terminal (100) of its own terminal (100) exceeds the reference number, which is higher than the number of terminals connected to its own terminal (100). When the number of lower communication terminals (100) is less than the standard number.

According to this aspect, it is not easy to select a communication terminal (100) whose number of lower-level communication terminals (100) exceeds the reference number. Therefore, by changing the upper-level communication terminal (100), the number of such communication terminals (100) can be reduced. Impact on other communication terminals (100).

The communication terminal (100) of the thirteenth aspect is in any of the first to eleventh aspects. The control unit (101) performs selection processing when the parameters related to the need to change the upper communication terminal (100) exceed the judgment value . The control unit (101) sets the judgment value as the case where the number of hops of the lower communication terminal (100) connected to its own terminal (100) is consistent with the maximum number of hops, which is higher than that of the lower communication terminal (100) connected to its own terminal (100). The case where the number of jumpers of the terminal (100) is less than the maximum number of jumpers.

According to this aspect, by changing the upper communication terminal (100) by the communication terminal (100), it is possible to reduce the possibility that the number of hops of the lower communication terminal (100) exceeds the maximum number of hops.

The communication system (600) of the fourteenth aspect includes a plurality of communication terminals (100) of any aspect of the first to thirteenth aspect, and performs multi-point hop communication between the plurality of communication terminals (100).

According to this aspect, it is possible to reduce the possibility that the specific upper candidate (100) is selected as the upper communication terminal (100).

The 15th aspect of the program enables the computer system to select the upper communication terminal (100) from the plurality of upper candidates (100) based on the operating conditions of the lower communication terminals (100) connected to each of the plurality of upper candidates (100) The selection process.

According to this aspect, it is possible to reduce the possibility that the specific upper candidate (100) is selected as the upper communication terminal (100).

Not limited to the above aspects, the various configurations (including modifications) of the communication terminal (100) of the above embodiment can be achieved by the routing method of the communication terminal (100), (computer) programs, or non-temporary recording media with programs recorded, etc. Be specific.

The configurations of the second to the thirteenth aspects are not necessary for the communication terminal (100) and can be omitted as appropriate.

10: Mother machine

20: Handset

100: Communication terminal (upper candidate, upper communication terminal, lower communication terminal)

101: Control Department

102: Ministry of Communications

103: Machine Interface

104: Memory Department

105: Memory Department

Claims (14)

A communication terminal, which is the above-mentioned communication terminal of a communication system for a plurality of communication terminals to perform multi-point hop communication, and comprising: a communication section; and a control section that controls the above-mentioned communication section, and the control section is based on: representing a plurality of higher-level candidates The operation number information of the operation number of the lower-level communication terminal obtained by each of the above-mentioned communication unit is used as the operation status of the lower-level communication terminal connected to the plurality of upper-level candidates, and the upper level is selected from the plurality of upper-level candidates. Communication terminal selection processing; the number of operations described above: the number of terminals of the lower communication terminals connected to each of the plurality of upper candidates that operate or communicate with the lower communication terminals during a specific period. Such as the communication terminal of claim 1, wherein the above-mentioned operating number information is shared among other communication terminals that can directly communicate with the above-mentioned communication unit. For example, in the communication terminal of claim 1, wherein the Hello packet sent from each of the above-mentioned multiple upper-level candidates includes the above-mentioned operation number information. For example, the communication terminal of claim 1, wherein the control unit estimates the number of operations of the lower communication terminal for each of the plurality of upper candidates, and performs the selection process based on the estimation result of the number of operations. Such as the communication terminal of any one of claims 1 to 4, wherein the lower communication terminal is a communication terminal with which the upper candidate can directly communicate. Such as the communication terminal of any one of claims 1 to 4, wherein the lower communication terminal is connected to all communication terminals lower than the upper candidate. The communication terminal according to any one of claims 1 to 4, wherein the control unit further performs the selection process based on the communication quality of the communication with each of the plurality of upper candidates. For example, the communication terminal of any one of claims 1 to 4, wherein the control unit selects the above-mentioned candidates based on the above-mentioned operating conditions of the above-mentioned lower-level communication terminal from among the above-mentioned plurality of upper-level candidates whose communication quality is higher than the threshold value. Upper communication terminal. For example, in the communication terminal of claim 8, in the selection process, the control unit gradually reduces the threshold value until the upper communication terminal can be selected. A communication terminal, which is the above-mentioned communication terminal of a communication system for a plurality of communication terminals to perform multi-point hop communication, and includes: a communication section; and a control section for controlling the above-mentioned communication section, and the control section is based on: representing a plurality of higher-level candidates The operation number information of the operation number of the lower communication terminal obtained by each of the above-mentioned communication unit is used as the operation status of the lower communication terminal connected to the above-mentioned plurality of upper-level candidates, and is performed from the above-mentioned plurality of upper-level candidates The selection process of the upper-level communication terminal is selected, and the control unit performs the selection process based on the representative value of the number of operations during a specific use period. A communication terminal, which is the above-mentioned communication terminal of a communication system for a plurality of communication terminals to perform multi-point hop communication, and includes: a communication unit; and a control unit for controlling the communication unit, the control unit being connected to each of the plurality of upper-level candidates The operation status of the lower communication terminal is to perform the selection process of selecting the upper communication terminal from the plurality of upper candidates, and the control unit executes the above when the parameter related to the upper communication terminal needs to be changed exceeds the judgment value In the selection process, the control unit is such that the number of the lower communication terminals connected to the own terminal exceeds the reference station in comparison with the case where the number of the lower communication terminals connected to the own terminal is less than the reference number In the case of the number, the above judgment value is increased; the above operating status includes: indicating that the number of terminals connected to each of the plurality of upper candidates is operating in a specific period or communicating with the lower communication terminals, that is, the number of operations. Operational information. A communication terminal, which is the above-mentioned communication terminal of a communication system for a plurality of communication terminals to perform multi-point hop communication, and includes: a communication part; and a control part that controls the above-mentioned communication part, The control unit performs the selection process of selecting the upper communication terminal from the plurality of upper candidates based on the operating conditions of the lower communication terminals connected to each of the plurality of upper candidates, and the control unit is in accordance with whether it is necessary to change the upper communication terminal. When the terminal-related parameters exceed the judgment value, the above-mentioned selection process is executed. The above-mentioned control unit: compared with the case where the number of hops of the lower communication terminal connected to the own terminal is less than the maximum number of hops, When the number of hops of the lower communication terminal matches the maximum number of hops, the above judgment value is increased; the above operating conditions include: indicating that the lower communication terminals connected to each of the plurality of upper candidates are in a specific period The operation information of the number of terminals of the lower communication terminal under operation or communication, that is, the operation number. A communication system is provided with a plurality of communication terminals such as any one of claim items 1 to 12, and multi-point hop communication is performed between the plurality of communication terminals. A non-temporary recording medium that can be read by a computer, and the recorded program is used to make the computer system: based on: the operation number information representing the operation number of the lower communication terminal obtained from each of the plurality of upper candidates through the communication unit is used as the connection According to the operating status of the lower communication terminal of each of the plurality of upper candidates, the selection process of selecting the upper communication terminal from the plurality of upper candidates is executed; the operation number system: connected to each of the plurality of upper candidates Among the above-mentioned lower-level communication terminals, the number of lower-level communication terminals operating or communicating during a specific period.

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