CN115298715A - Communication terminal, communication system, power saving control method, and power saving control program - Google Patents

Communication terminal, communication system, power saving control method, and power saving control program Download PDF

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Publication number
CN115298715A
CN115298715A CN202080098817.0A CN202080098817A CN115298715A CN 115298715 A CN115298715 A CN 115298715A CN 202080098817 A CN202080098817 A CN 202080098817A CN 115298715 A CN115298715 A CN 115298715A
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China
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communication
communication terminal
processing unit
service
state
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CN202080098817.0A
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CN115298715B (en
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金子直树
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

A communication terminal (1) of the present invention performs an intermittent operation in which an active state and a sleep state are repeated, and includes: a wireless communication processing unit (101) which communicates with a 2 nd service system via a communication network constructed for the 1 st service; a connected device communication processing unit (103) that performs communication with a connected device; a control unit (102) that, upon receiving a control instruction for a device from the 2 nd service system via the wireless communication processing unit (101), causes the connected device communication processing unit (103) to execute a communication process with the device; and a sleep time determination unit (113) that determines a sleep time, which is the duration of a sleep state, for each of the time periods based on the count result of the number of times of communication with the device for each time period, and in the sleep state, at least the transmission function of the wireless communication processing unit (101) is stopped.

Description

Communication terminal, communication system, power saving control method, and power saving control program
Technical Field
The present disclosure relates to a communication terminal connected to various meters for gas, water and sewage, and various sensors for monitoring, control, data collection, and the like, a communication system provided with the communication device, a power saving control method, and a power saving control program.
Background
Data transmission and reception by wireless communication may be performed for various services such as gas, automatic meter reading services for water and gas passages, and monitoring and control services based on various sensor data. For example, the communication terminal is connected to various meters such as gas meters, water and sewage meters, and various sensors for monitoring, control, data collection, and the like, communicates with the devices, and transmits and receives collected data to and from a higher-level system by wireless communication, thereby providing services such as an automatic meter reading service and a monitoring control service. These communication terminals are often installed in places where it is difficult to secure a commercial power supply together with connected devices, and therefore, it is required to drive the terminals using a battery as a power supply. Therefore, power saving is required in these communication terminals. One of the methods for saving power in a communication terminal is a method in which an active state and a sleep state of a communication function are repeated every intermittent cycle. In communication using this method, the longer the sleep time, which is the duration of the 1-time sleep state, the more the power consumption can be suppressed, but the longer the response time of communication becomes. Therefore, it is desirable to appropriately set the sleep time in the intermittent operation so as to achieve power saving while maintaining the responsiveness of communication.
Patent document 1 discloses the following technique: in a meter reading system for performing automatic meter reading of a water meter, a wireless device connected to the water meter performs intermittent reception to reduce power consumption. The wireless device described in patent literature 1 normally performs intermittent reception in a long intermittent period, and when a command to shorten the intermittent period is received from another wireless device that performs wireless communication with the wireless device, the intermittent period is shortened. By shortening the intermittent period, the sleep time is also shortened. Thus, the meter reading system described in patent document 1 generally suppresses power consumption of the wireless device, and reduces the data acquisition time by shortening the sleep time when data acquisition is required at any time such as at the time of installation or maintenance.
Documents of the prior art
Patent literature
Patent document 1: japanese patent laid-open publication No. 8-70488
Disclosure of Invention
Technical problem to be solved by the invention
In the meter reading system described in patent document 1, an operator operates a handheld terminal at the time of installation or maintenance, and causes another wireless device to transmit a command for changing an intermittent cycle each time. When the technique described in patent document 1 is applied to a service for collecting data from a plurality of wireless terminals in a higher-level system, an operator needs to set an intermittent period according to the situation of each communication terminal. In the future, the number of communication terminals providing various services is expected to increase, and it is assumed that there are also a plurality of operators performing maintenance management of communication terminals, and the time period for performing maintenance may differ for each operator. Further, depending on the provider of the device connected to the communication terminal, the frequency of communication required for management of the device may vary.
In regard to the plurality of communication terminals, setting the sleep time in the intermittent operation by the operator is a very troublesome task considering a time period for which maintenance is performed by each operator, a communication frequency for managing the device by each vendor, and the like. Further, if the sleep time in the intermittent operation is determined without considering this, depending on the communication terminal, there is a possibility that the sleep time is set to be short although the sleep time can be originally long, or the sleep is performed for a long time in a time period in which a quick response is desired, and thus there is a possibility that the sleep time is not appropriate.
The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to obtain a communication terminal capable of appropriately setting a sleep time in an intermittent operation without requiring a worker to be troublesome.
Means for solving the problems
In order to solve the above problems and achieve the object, a communication terminal according to the present disclosure is a communication terminal that performs an intermittent operation in which a 1 st state and a 2 nd state, which consumes less power than the 1 st state, are alternately repeated, the communication terminal including: a 1 st communication processing unit that is capable of communicating with a 2 nd service system for providing a 2 nd service via a communication network constructed for the 1 st service; and a 2 nd communication processing unit, the 2 nd communication processing unit being capable of performing communication with the connected device. The communication terminal further includes a control section that, upon receiving a control instruction for the device from the 2 nd service system via the 1 st communication processing section, causes the 2 nd communication processing section to execute communication processing with the device. The communication terminal further includes a sleep time determination unit that determines a sleep time, which is a duration of a 2 nd state, for each time slot based on a result of counting the number of times of communication with the device for each time slot, and stops at least a transmission function of the 1 st communication processing unit in the 2 nd state.
Effects of the invention
According to the present disclosure, the following effects are achieved: the time of sleep in intermittent operation can be set appropriately without requiring a worker's trouble.
Drawings
Fig. 1 is a diagram showing an example of the configuration of an overall system including a communication system according to an embodiment.
Fig. 2 is a diagram showing a configuration example obtained by embodying fig. 1.
Fig. 3 is a diagram showing a configuration example of a communication terminal and a gas meter.
Fig. 4 is a diagram showing an example of setting information of the embodiment.
Fig. 5 is a diagram showing an example of setting information of the embodiment.
Fig. 6 is a flowchart showing an example of the meter-reading data collection step according to the embodiment.
Fig. 7 is a diagram showing an example of an intermittent operation in the communication terminal according to the embodiment.
Fig. 8 is a flowchart showing one example of processing steps related to state transition in the communication terminal of the embodiment.
Fig. 9 is a diagram showing an example of the number of communications information of the embodiment.
Fig. 10 is a diagram showing an example of response time information of the embodiment.
Fig. 11 is a diagram showing an example of the procedure of the sleep time determination processing according to the embodiment.
Fig. 12 is a diagram showing one example of a communication frequency table of the embodiment.
Fig. 13 is a diagram showing one example of the response performance management table of the embodiment.
Fig. 14 is a diagram showing an example of a sleep schedule of the embodiment.
Detailed Description
Hereinafter, a communication terminal, a communication system, a power saving control method, and a power saving control program according to embodiments will be described in detail with reference to the drawings.
Provided is an implementation mode.
Fig. 1 is a diagram showing an example of the configuration of an overall system including a communication system according to an embodiment. As shown in fig. 1, the overall system of the embodiment includes: 1 st service systems 10, 20, 30 that perform processing for providing 1 st service; and communication systems 11, 21, 31 configured corresponding to the 1 st service systems 10, 20, 30. The overall system further includes 2 nd service systems 40 and 50 that perform processing for providing the 2 nd service. In addition, the entire system itself is also 1 communication system.
The 1 st service is, for example, an automatic meter reading service of usage amount of electric power, gas, water supply and drainage, a monitoring control service based on various sensor data, and the like. For example, in the case where the 1 st service is an automatic meter reading service for the usage amount of electric power, gas, water supply/drainage, or the like, the 1 st service systems 10, 20, and 30 are automatic meter reading systems that manage meter data collected via the communication systems 11, 21, and 31, respectively. For example, when the 1 st service is a monitoring control service, the 1 st service systems 10, 20, and 30 are monitoring control systems that perform monitoring control based on sensor data collected via the communication systems 11, 21, and 31, respectively.
The 1 st service means a service having a communication system constructed for the service, and the 1 st service provided by each of the 1 st service systems 10, 20, and 30 may be the same type of service or different types of services. The 1 st service provided by the 1 st service systems 10, 20, 30 may be different kinds of services, for example, the 1 st service provided by the 1 st service system 10 is an automatic meter reading service of electric power usage, and the 1 st service provided by the 1 st service system 20 is a monitor control service.
Each of the communication systems 11, 21, and 31 includes a plurality of communication devices. Each of the communication systems 11, 21, and 31 is a communication network constructed for the 1 st service. Each communication device constituting the communication system 11 may be connected wirelessly, may be connected by a dedicated line, may be connected by a power line, or may be connected via a mobile communication network provided for communication of a mobile terminal. Similarly, the communication devices constituting the communication systems 21 and 31 may be connected wirelessly, may be connected by dedicated lines, may be connected by power lines, or may be connected via a mobile communication network provided for communication with mobile terminals.
Each of the communication systems 11, 21, 31 is connectable to the 2 nd service system 40 and the 2 nd service system 50, respectively, via a WAN (Wide Area Network) 60. In addition, in fig. 1, each of the communication systems 11, 21, 31 is connected to the 2 nd service systems 40, 50, respectively, via the WAN60, but the connection manner thereof is not limited to the example via the WAN 60.
The 2 nd service means a service having no communication system configured for the service, and the 2 nd services provided by the 2 nd service systems 40 and 50 may be the same type of service or different types of services. The 2 nd service is, for example, an automatic meter reading service of usage of electric power, gas, water and gas, and a monitoring control service based on various sensor data. Further, the 2 nd service may be a service that collects or distributes data, or the like.
The communication terminals 1-1, 1-2, 1-10, 1-21, and 1-22 are communication devices that do not belong to any of the communication systems 11, 21, and 31, and communicate with any of the 2 nd service systems 40 and 50 via any of the communication systems 11, 21, and 31, thereby implementing the 2 nd service. That is, the communication terminals 1-1, 1-2, 1-10, 1-21, 1-22 perform communication for the 2 nd service. In detail, in the example shown in fig. 1, the communication terminals 1-1 and 1-2 communicate with either of the 2 nd service systems 40 and 50 via the communication system 11, the communication terminal 1-10 communicates with either of the 2 nd service systems 40 and 50 via the communication system 21, and the communication terminals 1-21 and 1-22 communicate with either of the 2 nd service systems 40 and 50 via the communication system 31. Thus, the communication terminals 1-1, 1-2, 1-10, 1-21, and 1-22 communicate with any of the 2 nd service systems 40 and 50 via the communication systems 11, 21, and 31, thereby providing the 2 nd service without constructing a new communication network for the 2 nd service. That is, the 2 nd service can be efficiently realized by using the existing communication systems 11, 21, and 31 as an infrastructure.
In the example shown in fig. 1, 31 st service systems 10, 20, 30 are illustrated, but the number of 1 st service systems is not limited thereto. Further, in the example shown in fig. 1, 2 nd service systems 40, 50 are illustrated, but the number of 2 nd service systems is not limited thereto. In addition, a plurality of 2 nd services may coexist within the same communication system. Further, in the example shown in fig. 1, 5 communication terminals 1-1, 1-2, 1-10, 1-21, 1-22 are illustrated, but the number of communication terminals is not limited thereto.
In the present embodiment, although the 2 nd service is efficiently provided by using the existing communication systems 11, 21, and 31 as an infrastructure, the example is described, but the method of communicating the communication terminals 1-1, 1-2, 1-10, 1-21, and 1-22 with the corresponding 2 nd service systems 40 and 50 is not limited to this. For example, the communication terminals 1-1, 1-2, 1-10, 1-21, 1-22 may constitute dedicated communication systems for the 2 nd service together with the corresponding 2 nd service systems 40, 50, respectively. Alternatively, the communication terminals 1-1, 1-2, 1-10, 1-21, 1-22 may communicate with the corresponding 2 nd service systems 40, 50, respectively, using a common line or the like other than the communication systems 11, 21, 31.
Fig. 2 is a diagram showing a configuration example obtained by embodying fig. 1. In fig. 2, the 1 st service systems 10 and 20, the communication systems 11 and 21, and the 2 nd service system 40 in fig. 1 are embodied. In fig. 2, as a specific example, the following example is shown: the 1 st service provided by the 1 st service systems 10 and 20 is an automatic meter reading service for the amount of power used, and the 2 nd service provided by the 2 nd service system 40 is an automatic meter reading service for the amount of gas used. The automatic power meter reading system 9 shown in fig. 2 is an example of the 1 st service system 10 shown in fig. 1, and manages a measurement result of a power usage amount and the like. The automatic power meter reading system 9 is connected to a communication system 11 configured to automatically read the amount of power used. Similarly, the communication system 21 is constructed for automatic meter reading of the amount of power used, and is connected to an automatic power meter reading system, not shown, which is an example of the 1 st service system 20 shown in fig. 1.
The gas meter reading system 7 is an example of the 2 nd service system 40 shown in fig. 1. In fig. 2, the communication terminals 1-1 to 1-6 can communicate with the automatic gas meter reading system 7 via the communication system 11, and the communication terminals 1-10 can communicate with the automatic gas meter reading system 7 via the communication system 21. The communication terminals 1-1 to 1-6 and 1-10 are often installed in places where it is difficult to secure a commercial power supply together with the gas meter. Therefore, the communication terminals 1-1 to 1-6 are often driven by batteries, and power saving is desired. The communication terminals 1-1 to 1-6, 1-10 perform an intermittent operation in which a startup state (Active state) which is the 1 st state and a Sleep state (Sleep state) which is the 2 nd state and consumes less power than the 1 st state are alternately repeated to save power. In the present embodiment, as will be described later, the ratio of the time in the active state to the time in the sleep state in 1 cycle of the intermittent operation is set according to the communication frequency for each time slot. Thus, it is possible to set an appropriate intermittent cycle, and to secure a response speed in a time zone in which a response speed is required while achieving power saving.
The following example is illustrated below, as shown in fig. 2: the 1 st service provided by the 1 st service systems 10 and 20 is an automatic meter reading service for the amount of power used, and the 2 nd service is an automatic meter reading service for the amount of gas used, but the contents of the 1 st service and the 2 nd service are not limited to these.
As shown in fig. 2, the communication system 11 includes smart meters (hereinafter abbreviated as SM) 2-1 to 2-13 that measure the amount of power used and transmit the measurement result to the automatic power meter reading system 9. The communication system 11 also includes a concentrator station, concentrator 3-1, that will receive the metering result sets from the SMs 2-1-2-6, and a concentrator station, concentrator 3-2, that will receive the metering result sets from the SMs 2-7-2-11. The concentrator 3-1 and the SM2-1 to 2-6 form a wireless multi-hop network. Concentrators 3-2 and SM 2-7-2-11 form a power line multi-hop network. The concentrators 3-1 and 3-2 are connected to an HES (Head End System) 6-1, which is a communication management device that manages communication in the communication System 11, via a WAN 5.
The multihop network constructed by the concentrators 3-1 and 3-2 and the SMs 2-1 to 2-11 is the same as the multihop network in a general smart meter system, and descriptions of path construction and the like in the multihop network are omitted. As in the multi-hop network in a general smart meter system, the path in the wireless multi-hop network can be changed. Although not shown in fig. 2, 1 concentrator is illustrated in each of the wireless multihop network and the power line multihop network, but generally, a plurality of concentrators are provided in each of the wireless multihop network and the power line multihop network.
The SMs 2-12, 2-13 are connected to the HES6-1 via the WAN5 and the mobile communication network 4 provided for communication of the mobile terminal. In fig. 2, for the sake of convenience of illustration, the mobile communication network 4 and the WAN5 are also shown within a broken line showing the communication system 11, but the mobile communication network 4 and the WAN5 are not included in the communication system 11. Further, the concentrators 3-1, 3-2 can be connected to an HES6-1, which is a communication management apparatus that manages communication within the communication system 11, via the mobile communication network 4.
Thus, in the example shown in fig. 2, the communication system 11 includes the SMs 2-1 to 2-13 that communicate by 3 types of communication methods, but the number of communication methods of the SMs 2-1 to 2-13 in the communication system 11 is not limited to 3. For example, SMs 2-1-2-13 within communication system 11 may all communicate via the same communication scheme. For example, SMs 2-1-2-13 within communication system 11 may all communicate over a wireless multi-hop network.
The communication system 21 shown in fig. 2 includes HES6-2 and SMs 2-21, 2-22. Although not shown in fig. 2, in the communication system 21, as in the case of the communication system 11, for example, 1 or more of 3 kinds of communication systems, that is, a wireless multi-hop network, a power line multi-hop network, and the mobile communication network 4 are used. Here, the SMs 2-21, 2-22 constitute a wireless multi-hop network together with a concentrator not shown. The HES6-2 is a communication management device that manages communication within the communication system 21.
In the following, SM2-1 to 2-13, 2-21, and 2-22 are each referred to as SM2 when they are not separately shown, concentrator 3 when they are each separately shown as concentrators 3-1 and 3-2, and HES6 when they are each separately shown as HES6-1 and 6-2. In fig. 2, 15 SM2 are illustrated, but in practice, the number of SM2 is more than 15 because SM2 is provided for each power consumer. Generally, the communication system 11 is a large-scale system including a plurality of SMs 2 in a wide area. SM2-1 to 2-13 are examples of a plurality of communication apparatuses constituting the communication system 11, and SM2-21 and 2-22 are examples of a plurality of communication apparatuses constituting the communication system 21. A part of SM2 performs communication based on IEEE (Institute of Electrical and Electronics Engineers) 802.15.4g/4e, for example.
The communication devices 1-1 to 1-6 can communicate with the automatic gas meter reading system 7 via the communication system 11. Specifically, the communication terminals 1-1 to 1-6 can enter an SM network a which is a network formed of communication devices belonging to the communication system 11. The communication devices belonging to the communication system 11 include the SM2-1 to 2-13, the concentrators 3-1, 3-2, and the HES6-1. Similarly, the communication devices 1 to 10 can communicate with the gas meter reading system 7 via the communication system 21. Specifically, the communication terminals 1 to 10 can enter an SM network B which is a network constituted by communication devices belonging to the communication system 21. The communication terminals 1-1 to 1-6 can enter the SM network by performing network entry processing on the corresponding SM network. As the network entry process, any process may be used, and a general process may be used.
In the present embodiment, SM2-1 to 2-13 have a function as a general smart meter, and can perform communication with the automatic gas meter reading system 7 via the communication terminals 1-1 to 1-6 of the communication system 11 by performing network entry processing with the communication terminals 1-1 to 1-6. Similarly, the SMs 2 to 21 and 2 to 22 have a function as a general smart meter, and can perform communication with the gas meter reading system 7 via the communication terminal 1 to 10 of the communication system 21 by performing a network entry process with the communication terminal 1 to 10.
The communication terminals 1-1 to 1-6, 1-10 are connected to gas meters 70-1 to 70-6, 70-10, which are one example of devices, respectively. The gas meters 70-1 to 70-6 and 70-10 respectively measure the usage amount of the gas and output the measurement results to the communication terminals 1-1 to 1-6 and 1-10. The communication devices 1-1 to 1-6 transmit the measurement results to the automatic gas meter reading system 7 via the communication system 11. The communication devices 1 to 10 transmit the measurement results to the gas meter reading system 7 via the communication system 21. Thus, the automatic gas meter reading system 7 can collect the usage amounts of the gas measured by the gas meters 70-1 to 70-6 and 70-10 via the communication terminals 1-1 to 1-6 and 1-10. The gas meters 70-1 to 70-6, 70-10 are one example of devices connected to a communication terminal. Since the devices can utilize the network by being connected to the devices in this way, the communication terminals 1-1 to 1-6 and 1-10 can also be referred to as IoT (Internet of Things) terminals that implement IoT. Hereinafter, the communication terminal 1 is described as the communication terminal 1 when the communication terminals 1-1 to 1-6 and 1-10 are not individually shown, and the gas meter 70 is described as the gas meter 70 when the communication terminals 70-1 to 70-6 and 70-10 are not individually shown.
In the configuration example shown in fig. 2, automatic meter reading of the usage amount of gas using the SM network a and the SM network B constructed for automatic meter reading of the usage amount of electric power can be realized. In general, a plurality of SMs 2 are arranged in a wide range, and the SM network a and the SM network B are large-scale networks. In the configuration example shown in fig. 2, by using such a wide-area and large-scale SM network, it is possible to collect measurement results of the usage amount of gas from a plurality of gas users in a wide range, and it is not necessary to newly build a network for automatic meter reading of the usage amount of gas.
The gas meter reading system 7 periodically collects, for example, the measurement results of the gas meters 70 as meter reading data. Therefore, the communication device 1 periodically transmits meter reading data to the gas meter reading system 7 via the communication system 11. Hereinafter, this cycle is referred to as a meter reading data transmission cycle. The meter reading data transmission period is, for example, 1 day, but the meter reading data transmission period is not limited thereto. In addition, the automatic gas meter reading system 7 may collect a plurality of measurement results measured in a plurality of times, for example, measurement results for each hour in 1 day. At this time, a meter reading data transmission period and a measurement period which is the time resolution of the measurement result are respectively determined. The communication terminal 1 is set with a meter-reading data transmission cycle, or a meter-reading data transmission cycle and a metering cycle. For example, by notifying the communication terminal 1 of the meter-reading data transmission cycle, or the meter-reading data transmission cycle and the metering cycle from the gas automatic meter reading system 7, the meter-reading data transmission cycle, or the meter-reading data transmission cycle and the metering cycle are set in the communication terminal 1.
Further, unlike the periodic collection of the meter reading data, the gas meter reading system 7 may collect the meter reading data or other data from the gas meter 70 periodically for maintenance, monitoring, and the like. When aperiodic data collection is performed, the gas meter reading system 7 instructs the gas meter 70 to transmit data via the communication systems 11 and 21 and the communication terminal 1. The time period for performing aperiodic data collection sometimes differs depending on the operator. For example, the following can be considered: some operators perform data collection for maintenance in the morning immediately after the start of business hours, and other operators perform data collection for maintenance in the late night by batch processing or the like. In addition, the time period for collecting the periodic meter reading data may vary according to the operator. Further, depending on the device connected to the communication terminal 1, the frequency of data collection may vary. In the present embodiment, even if these pieces of information are not known in advance, by counting the number of times of communication for each time slot and determining the sleep time in the intermittent operation of the communication terminal 1 based on the count result as described later, the responsiveness can be improved by shortening the sleep time in a time slot with a high communication frequency and the power saving effect can be improved by lengthening the sleep time in a time slot with a low communication frequency.
When only the transmission period of the meter reading data is determined and the measurement period is not determined, the communication terminal 1 instructs the gas meter 70 to transmit the meter reading data every transmission period of the meter reading data, thereby acquiring the meter reading data from the gas meter 70. The time at which the communication terminal 1 acquires the meter reading data from the gas meter 70 may be different from the time at which the communication terminal 1 transmits the meter reading data to the automatic gas meter reading system 7. For example, in the case that the transmission cycle of the meter reading data is 1 day, the acquisition and transmission of the meter reading data in the communication terminal 1 may be set to different times, for example, the communication terminal 1 may set the transmission cycle between 8:00 obtaining meter reading data from the gas meter 70, and in the step 10:00 sends the meter reading data to an automatic gas meter reading system 7.
When the transmission cycle and the measurement cycle of the meter reading data are determined, the communication terminal 1 instructs the gas meter 70 to transmit the meter reading data in each measurement cycle, thereby acquiring the meter reading data from the gas meter 70 and storing the meter reading data. Then, the communication terminal 1 transmits the stored meter reading data to the gas automatic meter reading system 7 at each meter reading data transmission cycle. Although the above-described processing relating to the meter reading data of the communication terminal 1 may be standard processing, in the present embodiment, as will be described later, some of these processing may be omitted depending on the setting of the gas meter 70.
Next, a description will be given of configuration examples of the communication terminal 1 and the gas meter 70. Fig. 3 is a diagram showing a configuration example of the communication terminal 1 and the gas meter 70. As shown in fig. 3, the communication terminal 1 includes an antenna 100, a wireless communication processing unit 101, a control unit 102, a connected device communication processing unit 103, an intermittent operation processing unit 104, and a storage unit 105. Although not shown, the communication terminal 1 may be provided with a battery for driving the communication terminal 1.
The wireless communication processing unit 101 is a 1 st communication processing unit and can communicate with the gas meter reading system 7, which is a 2 nd service system for providing the 2 nd service, via a communication network configured for the 1 st service. Specifically, the wireless communication processing unit 101 performs wireless communication with the SM2 via the antenna 100. The wireless communication processing unit 101 includes a communication circuit for performing communication corresponding to a wireless communication scheme with the SM 2. Here, although an example in which the communication terminal 1 performs wireless communication with the SM2 is described, the communication between the communication terminal 1 and the SM2 may be wired communication. When the communication between the communication terminal 1 and the SM2 is wired communication, the communication terminal 1 includes a communication processing unit that performs communication processing according to a communication method of wired communication, instead of the antenna 100 and the wireless communication processing unit 101.
The connected device communication processing unit 103 is a 2 nd communication processing unit and can perform communication with a connected device. Communication is performed with the device. The connected device communication processing unit 103 includes a communication circuit for performing communication according to a communication method with the device. Fig. 3 shows a state in which the communication terminal 1 is connected to a gas meter 70, which is an example of a device. An example in which the communication terminal 1 is connected to the gas meter 70 will be described below, but the device connected to the communication terminal 1 is not limited to the gas meter 70, and may be various meters such as a water supply/drainage channel, and various sensors for monitoring, control, data collection, and the like. Here, the communication between the communication terminal 1 and the device is wired communication, but may be wireless communication.
The connected device communication processing unit 103 can correspond to a plurality of communication methods. Examples of the communication method that the connected device communication processing unit 103 can support include U-Bus, N-line, a-line, H-line, and COSEM (company Specification for Energy meter communication Specification), but the communication method is not limited to this. When connected to the gas meter 70, the connected device communication processing unit 103 determines the communication method of the gas meter 70, and performs communication with the gas meter 70 according to the determined communication method. Here, an example is described in which the connected device communication processing section 103 can correspond to a plurality of communication methods, but in the case where the communication method between the communication terminal 1 and the device is determined to be 1, the connected device communication processing section 103 may correspond to 1 communication method.
The control unit 102 controls the operation of the communication terminal 1. For example, when a control instruction for the plant is received from the gas meter reading system 7 via the wireless communication processing unit 101, the control unit 102 causes the connected plant communication unit 103 to execute a communication process with the plant. The intermittent operation processing section 104 controls the intermittent operation of the communication terminal 1. The operations of the control unit 102 and the intermittent operation processing unit 104 will be described later. The control Unit 102 and the intermittent operation Processing Unit 104 are realized by, for example, processing circuits including processors such as a CPU (Central Processing Unit) and an MPU (Micro Processing Unit). The storage unit 105 is a memory for storing data and the like used by the control unit 102 and the intermittent operation processing unit 104 for processing. When the respective functions implemented by the control unit 102 and the intermittent operation processing unit 104 are provided as software, the storage unit 105 stores a program for the control unit 102 and the intermittent operation processing unit 104 to execute the respective functions, and the control unit 102 and the intermittent operation processing unit 104 are realized by the processor executing the program. The program may be provided by a storage medium or a communication medium. This program includes a power saving control program for performing power saving control in the communication terminal 1 of the present embodiment.
As described above, the communication terminal 1 performs the intermittent operation of repeating the active state and the sleep state for power saving. In the present embodiment, the intermittent period, which is a period of the intermittent operation, is made variable, thereby suppressing deterioration of responsiveness while achieving power saving. The intermittent operation processing unit 104 includes: a state determination unit (111) for managing a state relating to power saving of the communication terminal; a timer 112 that measures the duration of the Sleep state, i.e., a Sleep time (Sleep time); and a sleep time determination unit 113 for determining the sleep time. The states related to power saving of the communication terminal 1 include 2 states of an active state and a sleep state. The sleep state is a state that consumes less power than the active state. The definitions of the sleep state and the active state may be arbitrary as long as the power consumption of the sleep state is smaller than that of the active state. In general, since transmission processing in wireless communication consumes much power, at least the transmission function of the wireless communication processing unit 101 is stopped in the sleep state. In the sleep state, the operating frequency of the control unit 102 and the intermittent operation processing unit 104, that is, the operating frequency of a processor that specifically implements the processing circuits of the control unit 102 and the intermittent operation processing unit 104, may be set lower than that in the active state.
In addition, at least one of the active state and the sleep state may be further subdivided into a plurality of states according to power consumption. Hereinafter, the sleep state is set as follows: the transmission/reception function of the wireless communication processing unit 101 is stopped, and the operating frequencies of the control unit 102 and the intermittent operation processing unit 104 are lowered from the active state, and only a part of the functions of the control unit 102 is enabled. Specifically, for example, in the sleep state, the control unit 102 can execute a process of receiving an interrupt signal and a process of making the functions of the control unit 102 and the intermittent operation processing unit 104 effective when receiving the interrupt signal. The interrupt signal may be received from the gas meter 70 via the connected device communication processing unit 103, or may be generated inside the communication terminal 1. Further, the activation state is set to include the following states: the wireless communication processing unit 101 can perform transmission and reception, and the control unit 102 and the intermittent operation processing unit 104 have higher operating frequencies than those in the sleep state. In addition to this state, the active state may include a state defined in stages according to power consumption, such as a state in which the transmission function of the radio communication processing unit 101 is stopped and reception is possible by the radio communication processing unit 101, a state in which the transmission/reception function of the radio communication processing unit 101 is stopped and the operating frequency of the control unit 102 is higher than that of the sleep state, and the like. In addition, as described above, the definitions of the active state and the sleep state are not limited thereto as long as the power consumption of the sleep state is lower than that of the active state.
Next, a configuration example of the gas meter 70 will be described. As shown in fig. 3, the gas meter 70 includes a communication processing unit 71, a control unit 72, a storage unit 73, and a measurement unit 74. When the devices connected to the communication terminal 1 are various meters such as a sewer, the devices have the same configuration as the gas meter 70, although the measurement targets of the measurement unit 74 are different. When the device connected to the communication terminal 1 is a sensor of various types for monitoring, control, data collection, or the like, the device may include a detection unit instead of the measurement unit 74, and may include a communication processing unit 71, a control unit 72, and a storage unit 73 in the same manner as the gas meter. The detection unit may be a detector for detecting temperature, humidity, or the like, or may be a camera or the like for acquiring an image.
The communication processing unit 71 performs communication with the communication terminal 1. The communication processing unit 71 can correspond to a plurality of communication methods. Here, an example is explained in which the communication processing section 71 can correspond to a plurality of communication methods, but in the case where the communication method between the communication terminal 1 and the device is determined to be 1, the communication processing section 71 may correspond to 1 communication method.
The control unit 72 controls the operation of the gas meter 70. Specifically, for example, when receiving an instruction to transmit meter reading data, which is a measurement result of the measuring unit 74, via the communication processing unit 71, the control unit 72 transmits the measurement result of the measuring unit 74 as meter reading data to the communication terminal 1 via the communication processing unit 71. Further, when the function of autonomously notifying the meter-reading data is provided and the function is set to be effective, the control section 72 autonomously transmits the measurement result as the meter-reading data to the communication terminal 1 at a predetermined cycle. Further, when the control unit 72 has a function of periodically acquiring the measurement results and storing the measurement results in the storage unit 73 and the function is set to be effective, the control unit reads the measurement results stored in the storage unit 73, and collectively transmits the measurement results measured for a plurality of times to the communication terminal 1 as meter reading data. The setting contents of each function related to meter reading such as autonomous data notification and memory recording, that is, the setting contents related to data collection of the gas meter 70 are recorded in the storage unit 73 as setting information. The stored record is sometimes also referred to as a load survey.
The metering unit 74 meters the amount of gas used and transmits the measurement result to the control unit 72. The measurement unit 74 may perform measurement at a constant cycle, or may perform measurement when instructed by the control unit 72. The control unit 72 stores the measurement result in the storage unit 73, and when receiving an instruction to transmit meter reading data, reads the measurement result from the storage unit 73 and transmits the measurement result to the communication terminal 1 via the communication processing unit 71. The measuring unit 74 may directly store the measurement result in the storage unit 73. In addition, when the autonomous data notification is valid, the measurement result is read from the storage unit 73 and transmitted to the communication terminal 1 via the communication processing unit 71 at predetermined intervals. The control unit 72 may transmit the measurement result received from the measurement unit 74 to the communication terminal 1 via the communication processing unit 71.
The device connected to the communication terminal 1 may be provided with a detection section instead of the metering section 74, and in this case, the detection result of the detection section is transmitted from the device to the communication terminal 1 similarly instead of the above-described metering result.
Next, the operation of the present embodiment will be described. When the communication terminal 1 is connected to the gas meter 70, the communication method of the gas meter 70 is determined. Specifically, for example, the connected device communication processing unit 103 transmits data to the gas meter 70 by a certain communication method, and when a response returns normally, determines that the communication method of the gas meter 70 is the communication method that transmitted the data. When the response is not returned normally, the connected device communication processing unit 103 can determine the communication method of the gas meter 70 by repeating the same operation with another communication method. The method of determining the communication method of the gas meter 70 is not limited to this example.
When the determination of the communication method is completed, the communication terminal 1 starts communication with the gas meter 70 according to the determined communication method, and acquires setting information from the gas meter 70. Specifically, the control unit 102 instructs the gas meter 70 to transmit setting information on meter reading via the connected device communication processing unit 103. When receiving the instruction via the communication processing unit 71, the control unit 72 of the gas meter 70 reads the setting information from the storage unit 73, and transmits the read setting information to the communication terminal 1 via the communication processing unit 71.
Fig. 4 and 5 are diagrams showing examples of setting information according to the present embodiment. As shown in fig. 4 and 5, the setting information indicates the contents of settings related to each function such as the above-described autonomous data notification and storage record. In fig. 4 and 5, the case where each function is set to be valid is indicated as "present", and the case where each function is not present or is set to be invalid although each function is present is indicated as "absent".
Fig. 4 shows an example of setting information acquired from a gas meter 70 having an autonomous data notification function, which is set to be valid and does not have a function of storing a record. When the autonomous data notification function is set to be active, the set value of the notification cycle of the autonomous notification data of the gas meter 70 is also stored in the setting information. In the example shown in fig. 4, the notification period is set to 1 day. Fig. 5 shows an example of setting information acquired from a gas meter 70 having an autonomous data notification function and a memory recording function, and these functions are set to be valid. When the memory recording function is set to be effective, the acquisition cycle, which is the cycle in which the gas meter 70 measures and stores data, is also stored in the setting information. In the example shown in fig. 5, the acquisition period is 1 hour. The gas meter 70 set as shown in fig. 5 measures and stores the measurement result every 1 hour, and transmits the measurement result corresponding to 24 hours to the communication terminal 1 every 24 hours. In addition, fig. 4 and 5 are examples, and the acquisition period and the notification period are not limited thereto.
The control unit 102 refers to the setting information stored in the storage unit 105, and does not give a transmission instruction to the gas meter 70 for periodic data collection when the autonomous data notification function of the gas meter 70 is effective. Thus, the communication terminal 1 does not need to be in the activated state for transmission of the instruction for the periodic data collection, and the power consumption of the communication terminal 1 can be suppressed. When the notification cycle set in the gas meter 70 is different from the set transmission cycle of the meter reading data, the control unit 102 of the communication terminal 1 instructs the gas meter 70 to change the notification cycle via the connected device communication processing unit 103.
Further, the control unit 102 refers to the setting information stored in the storage unit 105, and when the storage and recording function of the gas meter 70 is effective, even when the measurement cycle is set together with the meter reading data transmission cycle, does not perform a transmission instruction to the gas meter 70 for data collection for each measurement cycle. Thus, the communication terminal 1 does not need to be in an active state for transmission of an instruction for periodic data collection, and power consumption of the communication terminal 1 can be suppressed. When the acquisition cycle set in the gas meter 70 is different from the measurement cycle set, the control unit 102 of the communication terminal 1 instructs the gas meter 70 to change the acquisition cycle via the connected device communication processing unit 103.
The control unit 102 of the communication terminal 1 may instruct the gas meter 70 to set the notification cycle of the autonomous data notification as the measurement cycle, when the autonomous data notification function of the gas meter 70 is enabled, the storage recording function is disabled, and the measurement cycle is set together with the meter data transmission cycle, with reference to the setting information stored in the storage unit 105. In this case, the control unit 102 does not instruct the gas meter 70 to collect data for each measurement cycle.
Next, a general operation related to the collection of meter reading data in the present embodiment will be described. Fig. 6 is a flowchart showing an example of a meter reading data collection procedure according to the present embodiment. The following example is shown in fig. 6: a transmission cycle and a measurement cycle of the meter reading data are set for the communication terminal 1, and the memory recording function of the gas meter 70 is disabled. Fig. 6 shows an example of processing normally performed in automatic meter reading, regardless of the presence or absence of intermittent operation of the communication terminal 1. The processing shown in fig. 6 is also performed in this embodiment.
As shown in fig. 6, the communication terminal 1 transmits the meter reading data to the gas automatic meter reading system 7 at each meter reading data transmission cycle (step S1). The meter reading data reaches the gas automatic meter reading system 7 through the communication system 11. Although not shown in fig. 6, the communication terminal 1 performs reception of meter reading data in step S2 described later before step S1 in the uppermost part of fig. 6. Although not shown in fig. 6, in the communication system 11, the meter reading data reaches the HES6-1 via the SM2, the concentrator 3, and the WAN5, or via the SM2, the mobile communication network 4, and the WAN5, and is transmitted from the HES6-1 to the gas automatic meter reading system 7 via the WAN 60. A separate explanation will be omitted hereinafter, but the communication between the communication terminal 1 and the gas meter reading system 7 is performed via the communication system 11 in this manner.
The communication terminal 1 receives meter reading data from the gas meter 70 as a device every measurement cycle (step S2). When the autonomous data notification function of the gas meter 70 is disabled, the communication terminal 1 transmits a transmission instruction of the meter reading data to the gas meter 70 before the reception in each step S2. In the case where the autonomous data notification function is effective, the transmission instruction is not necessary.
The communication terminal 1 makes an inquiry to the gas meter reading system 7 to confirm whether or not a control instruction for maintenance, monitoring, or the like of the gas meter 70 is given from the gas meter reading system 7 (step S3). When the control instruction is given, the gas meter reading system 7 transmits the control instruction to the communication terminal 1 when receiving the inquiry (step S4). In addition, although the examples of making an inquiry to the gas meter reading system 7 are shown in steps S3 and S4, instead of this, the control instruction from the gas meter reading system 7 may be held in the communication system 11, and the inquiry from the communication terminal 1 may be received by the communication system 11, and the control instruction corresponding to the inquiry may be transmitted by the communication system 11. For example, the SM2 connected to the communication terminal 1 may hold the control instruction, and transmit the control instruction to the communication terminal 1 if the SM2 receives the inquiry from the communication terminal 1. The control instruction may be, for example, an instruction to acquire meter reading data or other data from the gas meter 70, but the content of the control instruction is not limited to this. Here, when maintenance, monitoring, or the like of the gas meter 70 is required, the automatic gas meter reading system 7 holds a control instruction corresponding to the gas meter 70, and transmits the held control instruction to the communication terminal 1 when an inquiry is made from the communication terminal 1 connected to the gas meter 70. Therefore, the communication terminal 1 can set the wireless communication processing unit 101 to an active state to receive a control instruction from the gas meter reading system 7 within a certain time after the inquiry is transmitted. In fig. 6, even if an inquiry is received from the communication terminal 1, the gas automatic meter reading system 7 does not transmit a control instruction when there is no control instruction. If the control instruction is not received from the automatic gas meter reading system 7 even after a certain time has elapsed from the inquiry, the communication terminal 1 determines that there is no control instruction. Hereinafter, the control instruction from the gas meter automatic reading system 7 is also referred to as a control instruction from the system.
When receiving a control instruction from the gas meter reading system 7, the communication terminal 1 transmits a control request conforming to the control instruction to the gas meter 70 (step S5). Upon receiving the control request, the gas meter 70 transmits a control response to the communication terminal 1 (step S6). When receiving the control response from the gas meter 70, the communication terminal 1 transmits the control result to the gas automatic meter reading system 7 based on the control response (step S7).
Specifically, for example, when the control instruction received by the communication terminal 1 from the gas meter reading system 7 is an instruction to acquire meter reading data from the gas meter 70, the communication terminal 1 transmits a control request requesting acquisition of the meter reading data to the gas meter 70. If the control request is received, the gas meter 70 transmits the meter reading data as a control response to the communication terminal 1. The communication terminal 1 sends the meter reading data as a control result to the automatic gas meter reading system 7. Further, when the control instruction received by the communication terminal 1 from the gas meter reading system 7 is an instruction requesting a change in the setting of the gas meter 70, the communication terminal 1 transmits a control request requesting the change in the setting to the gas meter 70. Upon receiving the control request, the gas meter 70 changes the setting, and upon completion of the change of the setting, transmits a control response indicating that the setting has been changed to the communication terminal 1. The communication terminal 1 transmits information indicating that the setting is changed to the gas meter reading system 7 as a control result.
As described above, regular collection of meter reading data and irregular control instructions from the gas meter reading system 7 are generally performed. On the other hand, the communication terminal 1 performs the intermittent operation as described above. In order to perform the intermittent operation so that the processing shown in fig. 6 is performed without a large delay, it is desirable to appropriately set the intermittent period.
Fig. 7 is a diagram showing an example of an intermittent operation in the communication terminal 1 according to the present embodiment. As shown in fig. 7, the communication terminal 1 alternately repeats the active state and the sleep state. In the present embodiment, the duration of the active state 1 time, i.e., the activation time, is not fixed, and a task to be executed in the active state 1 time is executed, and when the task is completed, the active state is shifted to the sleep state. The task executed in the 1-time activation state is, for example, predetermined processing. Therefore, the start time varies depending on the processing time of the task. In addition, the duration of the activation state is not limited to this example, and may be fixedly determined, or may be determined in an arbitrary manner. On the other hand, the sleep time is determined for each time slot as described later. As shown in fig. 7, even if the communication terminal 1 is in the sleep state, the communication terminal shifts to the active state upon receiving the interrupt signal. When the function of the autonomous data notification is valid, the gas meter 70 transmits the meter reading data as an interrupt signal in each notification cycle. Thus, when the function of autonomous data notification is effective, the communication terminal 1 does not need to transmit a data transmission instruction to the gas meter 70 in order to acquire periodic meter reading data from the gas meter 70, and the time of the active state can be shortened.
As shown in fig. 6, the processing performed in the activated state by the communication terminal 1 includes processing based on a control instruction received from the gas meter reading system 7, processing for acquiring meter reading data from the gas meter 70, and processing for transmitting the meter reading data to the gas meter reading system 7. The communication terminal 1 executes the tasks corresponding to 1 of the processes of these categories within 1 activation time. In addition, the communication terminal 1 may perform the processing of the category other than the above-described processing of the category, and in this case, similarly, the tasks corresponding to the processing of 1 category among the processing of the plurality of categories are executed within 1 activation time. The number of tasks to be executed in 1 activation time may be 1 or more. The tasks generated by the control unit 102 and generated are stored in the storage unit 105 as task information. When the sleep state is changed to the active state, the control unit 102 executes the oldest task among the tasks indicated by the task information stored in the storage unit 105. The executed task is deleted.
For example, the control unit 102 stores a task of transmitting the meter reading data to the gas meter reading system 7 for each meter reading data transmission cycle in the storage unit 105. The control unit 102 also stores a task of acquiring the meter reading data from the gas meter 70 for each measurement cycle when the measurement cycle is set, or for each meter reading data transmission cycle when the measurement cycle is not set, in the storage unit 105. When the function of autonomous data notification of the gas meter 70 is effective, the task of acquiring the meter reading data from the gas meter 70 is not generated, and the meter reading data is received by the interrupt signal as described above. When the timing of the inquiry for the control instruction is reached, the control unit 102 stores a task of transmitting the meter reading data to the gas meter reading system 7 in the storage unit 105.
Thus, when the setting information acquired from the gas meter 70 does not include information indicating that the setting of the gas meter 70 autonomously performing the regular data transmission is valid, the control unit 102 includes the process of periodically requesting the gas meter 70 to transmit data in the task information. On the other hand, when the setting information acquired from the gas meter 70 includes information indicating that the setting showing that the gas meter 70 autonomously performs the periodic data transmission is valid, the control unit 102 does not include the process of periodically requesting the gas meter 70 to transmit data in the task information.
Further, when the communication terminal 1 specifies the 1 st cycle (measurement cycle) in which data is acquired from the gas meter 70 and the 2 nd cycle (meter reading data transmission cycle) in which data is transmitted to the 2 nd service system, and when the setting information acquired from the gas meter 70 does not include information indicating that the function of periodically acquiring and holding data by the gas meter 70 is valid, the control unit 102 includes, in the task information, a process of requesting the gas meter 70 to transmit data in the 1 st cycle (measurement cycle). When the setting information acquired from the gas meter 70 includes information indicating that the function of periodically acquiring and holding data of the gas meter 70 is valid, the control unit 102 does not include, in the task information, a process of requesting data transmission to the gas meter 70 in the 1 st cycle (measurement cycle).
Next, a state transition between the active state and the sleep state in the communication terminal 1 of the present embodiment will be described as an example. In the present embodiment, in the active state, the communication terminal 1 records information used for the sleep time determination process described later, such as the number of communications per time slot and the round trip time (round trip delay time) with the device. The number of communications per time period is recorded in the storage section 105 as the number-of-communications information, and the round trip time is recorded in the storage section 105 as the response time information. Here, the time period is a time period obtained by dividing 1 day into a plurality of time periods, and for example, a time period of every 3 hours such as 0. The time period is not limited to every 3 hours, and the length of the time period may be shorter than 3 hours or longer than 3 hours.
Fig. 8 is a flowchart showing an example of processing steps related to state transition in the communication terminal 1 of the present embodiment. In fig. 8, it is assumed that the processing is started when the communication terminal 1 is in the sleep state. As shown in fig. 8, the communication terminal 1 determines whether or not the sleep time has elapsed (step S11). Specifically, the timer 112 of the intermittent operation processing unit 104 measures an elapsed time from the time when the active state is shifted to the sleep state, and notifies the state determination unit 111 that the sleep time has elapsed when the elapsed time reaches the set sleep time. Thus, the state determination unit 111 determines that the sleep time has elapsed. In the present embodiment, as will be described later, the sleep time is determined by a sleep time determination process. Before the determination processing of the sleep time is performed, an initial value is set for the sleep time.
If it is determined that the sleep time has elapsed (yes in step S11), the communication terminal 1 shifts to the active state (step S12). Specifically, when determining that the sleep time has elapsed, the state determination unit 111 changes the operating frequency of the control unit 102 or sets the wireless communication processing unit 101 to a state capable of transmitting and receiving so as to be in an active state. In addition, when the active state is subdivided into a plurality of states, in this stage, for example, only the restriction on the operation of the control unit 102 may be released without making the wireless communication processing unit 101 transceivable.
Next, when the communication terminal 1 is in the active state, it determines whether or not the data collection timing is set (step S13). Specifically, the control unit 102 checks the tasks stored in the storage unit 105, and determines whether or not the oldest task among the stored tasks is a task for collecting data from the gas meter 70. When determining that the timing is the data collection timing (yes in step S13), the communication terminal 1 adds 1 to the number of communications in the corresponding time zone (step S14). Specifically, the control unit 102 notifies the state determination unit 111 that it is the data collection timing, and the state determination unit 111 increments the number of communications for the corresponding time slot by 1 in the number of communications information stored in the storage unit 105.
Fig. 9 is a diagram showing an example of the communication count information according to the present embodiment. As shown in fig. 9, the communication number information contains the number of communications for each time period of a plurality of days. Fig. 9 shows an example in which the number of communications for 10 days is included in the number-of-communications information. For example, the communication count information includes an actual value of the number of communications for each time period of the last 10 days. In step S14 shown in fig. 8, the number of communications for the corresponding time period on the day of processing is updated. For example, 10 at 10 days 2 months 10:00 when step S14 is performed, 9 of 2 months and 10 days of the communication count information shown in fig. 9:00-11: the number of communications for the time period of 59 plus 1. Here, in the determination process of the sleep time described later, since it is assumed that the average value of the number of communications for 10 days is used for each time zone, the number of communications information is also recorded for 10 days, but 10 days is an example, and the number of days to be recorded as the number of communications information may be determined based on the content of the statistical process in the determination process of the sleep time. Here, in the determination process of the sleep time described later, it is assumed that the average value of the number of communications for a plurality of days is calculated for each time slot, but the present invention is not limited thereto, and the average value of the number of communications for 10 days is first calculated, and thereafter, the average value for each time slot and the latest value, which is the number of communications for each time slot on the day, are stored in the number-of-communications information, and the average value and the latest value are weighted and added to obtain the average value. Thus, the content of the communication count information can be set as appropriate in accordance with the processing performed in the sleep time determination processing described later. In fig. 9, the number of communications in each time slot is recorded for each communication method.
Returning to the description of fig. 8, after step S14, the communication terminal 1 performs a communication process with the gas meter 70 as a connected device (step S15). Specifically, the control unit 102 transmits a control request to the gas meter 70 via the connected device communication processing unit 103, and receives a response to the control request from the gas meter 70 via the connected device communication processing unit 103. When the control request is a meter reading data acquisition request, the response includes meter reading data. In the case where the control request is based on a control instruction from the system, the response is a control result corresponding to the control instruction.
The communication terminal 1 measures the round trip time, which is the time from the transmission of the control request to the reception of the response in the communication process of step S15, and stores the round trip time in the storage unit 105 (step S16). Specifically, the control unit 102 or the state determination unit 111 measures the round trip time and stores the round trip time as response time information in the storage unit 105. Fig. 10 is a diagram showing an example of response time information in the present embodiment. As shown in fig. 10, the storage unit 105 records a predetermined number of round trip times as response time information. In the response time information, new data is added to the round trip time every measurement, and the corresponding old data is deleted from the response time information. Since the round trip time may vary depending on the communication method, the round trip time is recorded for each communication method as shown in fig. 10. The round trip time recorded in the response time information is used to calculate an average value in statistical processing in the sleep time determination processing described later, and therefore the number of round trip times recorded in the response time information is determined based on the statistical processing. Similarly to the above-described number of communications, an average value may be held, and the latest value may be added to the average value by weighting in the determination process of the sleep time.
Returning to the explanation of fig. 8, after step S16, the communication terminal 1 records or notifies the communication result (step S17). The communication result is other control results such as meter reading data acquired from the gas meter 70, a response indicating that the setting is completed when the setting is instructed, and the like. For example, when the task being executed is acquisition of meter reading data for each measurement cycle, the control unit 102 stores the meter reading data in the storage unit 105, records the communication result, and notifies the state determination unit 111 of the end of the task. For example, when the task being executed is based on a control instruction from the system, the control unit 102 notifies the gas meter reading data to the gas meter reading automation system 7 using the communication result acquired from the gas meter 70 as the control result, and notifies the state determination unit 111 of the end of the task.
After step S17, communication terminal 1 shifts to the sleep state (step S18). Specifically, when the control unit 102 notifies the end of the task, the state determination unit 111 causes the wireless communication processing unit 101 to transition to the power saving state, and causes the control unit 102 and the intermittent operation processing unit 104 to transition to the power saving state. For example, the state determination unit 111 performs processing such as stopping the transmission/reception function of the wireless communication processing unit 101, stopping the supply of power to the communication circuit of the wireless communication processing unit 101, reducing the operating frequency of the control unit 102 and the intermittent operation processing unit 104, or limiting the functions of the control unit 102 and the intermittent operation processing unit 104.
When the communication terminal 1 shifts to the sleep state, the communication terminal starts measurement of the sleep time by the timer 112, and repeats the processing from step S11. In step S11, if the sleep time has not elapsed (no in step S11), the sleep state is established until the sleep time has elapsed. Note that the flowchart shown in fig. 8 does not describe the processing when the interrupt signal is received, and as shown in fig. 7, even in the sleep state, communication terminal 1 shifts to the active state when receiving the interrupt signal.
When it is determined in step S13 that the data collection timing is not the data collection timing (no in step S13), the communication terminal 1 determines whether or not the data transmission timing is the data transmission timing to the system, that is, the gas meter reading system 7 (step S19). Specifically, the control unit 102 checks the tasks stored in the storage unit 105, and determines whether or not the oldest task among the stored tasks is a task for transmitting meter reading data to the gas meter reading system 7. If it is the system-specific data transmission timing (yes in step S19), the communication terminal 1 transmits the system-specific data, that is, the meter reading data to the gas meter reading system 7 (step S20), and the process proceeds to step S18. When the active state is subdivided into a plurality of states and the transmission function of the wireless communication processing unit 101 is stopped at the time when step S19 is executed, the communication terminal 1 transmits data after the transmission function of the wireless communication processing unit 101 is activated in step S20.
If the timing is not the data transmission timing for the system (no in step S19), the communication terminal 1 determines whether or not the timing is the timing to make an inquiry to the system (step S21). Specifically, the control unit 102 checks the tasks stored in the storage unit 105, and determines whether or not the oldest task among the stored tasks is a task to be queried by the system. When the timing is the inquiry timing for the system (yes in step S21), the communication terminal 1 makes an inquiry to the system (step S22). When the active state is subdivided into a plurality of states and the transmission function of the wireless communication processing unit 101 is stopped at the time when step S19 is performed, the communication terminal 1 makes an inquiry after the transmission/reception function of the wireless communication processing unit 101 is enabled in step S22.
After the inquiry to the system, the communication terminal 1 determines whether or not there is a control instruction from the system (step S23). Specifically, the control unit 102 determines whether or not a control instruction is received from the gas meter reading system 7 via the wireless communication processing unit 101. If the control instruction is not received from the gas meter reading system 7 within a certain time after the inquiry is sent, the control unit 102 determines that the control instruction is not given. When the control instruction is given (yes in step S23), the processes from step S14 onward are executed to perform the process based on the control instruction. When the processing after step S14 is performed through step S23, the communication terminal 1 performs processing such as collecting meter reading data or other data from the gas meter 70 or setting for the gas meter 70 based on the control instruction.
If there is no control instruction from the system (no at step S23), the communication terminal 1 advances the process to step S18. If the timing is not the inquiry timing for the system (no in step S21), the communication terminal 1 advances the process to step S18.
As described above, when the task performed within 1 activation time ends, the state determination unit 111 causes the communication terminal 1 to transition from the active state to the sleep state. When there is no task to be executed, the communication terminal 1 confirms only the task and shifts to the sleep state. This confirmed processing is also one example of predetermined processing that should be performed in the 1-time activation state. This makes it possible to control the start time to a time required for processing. Since the response time differs for each gas meter 70, if the start time is determined in advance, the round trip time differs for each gas meter 70, and therefore, it is necessary to set a start time longer than the maximum round trip time. In contrast, in the present embodiment, when data is collected from the gas meter 70, the sleep state is quickly shifted to when the collection of data is completed, and therefore, when the round trip time is short, the start-up time can be shortened as compared with the case where the start-up time is predetermined. Thus, in the present embodiment, it can be said that the activation time is determined by the round trip time, i.e., the response performance.
Next, a determination process of the sleep time in the present embodiment will be described. As described above, the activation time is determined according to the processing time, but the sleep time is determined according to the count result of the number of communications per time period, or the like. The determination process of the sleep time is performed, for example, once a day, but the timing of performing the determination process of the sleep time is not limited thereto, and may be performed, for example, once a few days.
Fig. 11 is a diagram showing an example of the procedure of the sleep time determination processing according to the present embodiment. The communication terminal 1 first updates the table (step S31). Specifically, the sleep time determination unit 113 updates the communication frequency table and the response performance management table stored in the storage unit 105 based on the communication frequency information and the response time information stored in the storage unit 105.
Fig. 12 is a diagram showing an example of the communication frequency table of the present embodiment. The communication frequency table includes an actual value of the number of times of communication in each time slot and a pause period division in each time slot for each communication method. The actual value of the number of communications is based on the result of counting the number of communications for each time slot, and more specifically, is a value obtained by statistically processing the number of communications for each time slot stored in the number of communications information. For example, the actual value of the number of communications is an average value of the number of communications over 10 days per time period. The sleep time determination unit 113 calculates an actual value of the number of communications in each time slot by performing statistical processing using the number of communications information, and stores the calculated value in the communications frequency table. The intermittent period division is a division representing sleep time determined by the number of communications. For example, the correspondence between the number of communications and the intermittent cycle division is predetermined, such as intermittent cycle division D in the case where the number of communications is 1, intermittent cycle division C in the case where the number of communications is 1 or more and less than 5, intermittent cycle division B in the case where the number of communications is 5 or more and less than 10, and intermittent cycle division a in the case where the number of communications is 10 or more. The sleep time determination unit 113 determines, based on the correspondence, intermittent cycle divisions corresponding to actual values of the number of communications in each time slot, and stores the intermittent cycle divisions in a communications frequency table. Here, the intermittent cycle division defines 4 divisions a to D, and division D is set as the division having the longest sleep time, and the corresponding sleep time is longer in the order of letters a, B, C, and D.
In step S31, the sleep time determination unit 113 calculates an actual value of the round trip time for each communication method and stores the calculated value in the storage unit 105. The actual value of the round trip time for example comprises the average response performance. The sleep time determination unit 113 calculates the average response performance by performing statistical processing using the response time information, and stores the average response performance in the storage unit 105.
Returning to the description of fig. 11. After step S31, the communication terminal 1 acquires the corresponding intermittent cycle division from the communication frequency management table (step S32). Specifically, the sleep time determination unit 113 selects a time slot to be processed, and acquires intermittent cycle division of the time slot selected from the communication frequency management table.
Next, the communication terminal 1 acquires the equivalent intermittent cycle inclination division from the response performance management table, and determines the intermittent cycle division using the intermittent cycle inclination division (step S33). Specifically, the sleep time determination unit 113 acquires a corresponding intermittent cycle ramp component from the response performance management table based on the actual value of the round trip time, and determines the intermittent cycle component based on the intermittent cycle ramp component and the intermittent cycle component acquired in step S32.
Fig. 13 is a diagram showing an example of the response performance management table according to the present embodiment. As shown in fig. 13, the response performance management table contains average response performance and intermittent cycle tilt division. The example shown in fig. 13 shows the following case: the intermittent cycle tilt is divided into +2 when the average response performance of the actual value of the round trip time is 5000ms or more, and +1 when the average response performance of the actual value of the round trip time is 500ms or more and less than 5000 ms. In addition, when the response performance is a range not included in the response performance management table, that is, when the average response performance of the actual value of the round trip time is less than 500ms, the intermittent cycle tilt is divided into 0. In addition, although the example in which the intermittent period slope division is determined based on the average response performance is shown here, the intermittent period slope division may be further determined based on the round trip time at the time of final communication.
The sleep time determination unit 113 acquires a corresponding intermittent cycle slope division from the response performance management table based on the actual value of the round trip time, and changes the intermittent cycle division acquired in step S32 to a division having a longer sleep time of 1 division when the intermittent cycle slope division acquired in step S33 is, for example, +1. For example, if the intermittent cycle division acquired in step S32 is a and the intermittent cycle inclination division is +1, the sleep time determination unit 113 determines the intermittent cycle division as B. For example, if the intermittent cycle division a and the intermittent cycle inclination division +3 acquired in step S32 are determined, the sleep time determination unit 113 determines that the intermittent cycle division is C.
Returning to the description of fig. 11. After step S33, the sleep time determination unit 113 sets the sleep time corresponding to the determined intermittent cycle division based on the sleep time table (step S34). Specifically, for example, each piece of slot sleep time information indicating the sleep time for each slot is held in the storage unit 103, and the value of the sleep time of the corresponding slot in each piece of slot sleep time information is updated. After step S34, the sleep time determination unit 113 determines whether or not the processing is completed for all the slots (step S35), and if the processing is completed for all the slots (yes in step S35), the sleep time determination unit ends the sleep time determination processing. If there is a time slot in which processing is not performed (no in step S35), the sleep time determination unit 113 changes the time slot to be processed, and repeats the processing from step S32.
The sleep time for each time slot is determined by the above processing. The sleep time determination unit 113 sets the expiration time of the timer 112 to a corresponding sleep time for each slot based on the slot sleep time information. FIG. 14 shows the present embodimentA diagram of one example of a sleep schedule of formula (la). As shown in fig. 14, the sleep schedule includes sleep times divided per intermittent period. As shown in FIG. 14, the intermittent period divisions A to D correspond to sleep times T, respectively 1 ～T 4 。T 1 ＜T 2 ＜T 3 ＜T 4 . For example, in automatic meter reading for gas and sewage, the period for the communication terminal 1 to acquire meter reading data from the device is often as short as about 1 hour. The sleep time is generally shorter than the period of the communication terminal 1 acquiring the meter reading data, and is, for example, about several tens of seconds to several minutes, but not limited thereto. The start time is a time for executing 1 task, and is therefore, for example, several ms to several s.
In addition, the following example is explained in the above example: the communication terminal 1 makes an inquiry to receive a control instruction from the gas meter reading system 7, but may receive a control instruction from the gas meter reading system 7 without making an inquiry. In this case, since the communication terminal 1 does not know when the control instruction is received from the gas meter reading system 7, the reception function of the wireless communication processing unit 101 can be enabled even in the sleep state. Alternatively, the intermittent period for the reception function of the radio communication processing section 101 may be determined separately from the activation time and the sleep time, such as setting the reception function of the radio communication processing section 101 in an active state during a fixed activation time and in a sleep state during a fixed sleep time. In this case, if there is no response after the control instruction is transmitted to the communication terminal 1, the gas automatic meter reading system 7 repeats the retransmission of the control instruction for a period longer than the sleep state.
In the above-described example, the intermittent cycle inclination division is determined based on the response performance, and the intermittent cycle division is determined based on the intermittent cycle inclination division. That is, the intermittent cycle division determined based on the number of communications may be used as the determined intermittent cycle division. In the above-described example, the communication terminal 1 determines the sleep time based on the number of communications with the gas meter 70 as the device, but the present invention is not limited to this, and the sleep time of each time period may be determined based on the number of communications with the automatic gas meter reading system 7, that is, the number of communications with the SM2, counted for each time period, and the number of communications with the automatic gas meter reading system 7. When the collection period is determined, the number of communications for periodically collecting meter reading data between the communication terminal 1 and the gas meter reading system 7 is determined. Therefore, even if the above-described technique of the number of communications is not performed, the communication terminal 1 can grasp the timing of the periodic collection, and therefore, the number of communications in each time slot can be calculated accordingly. As described above, the connected device communication processing unit 103 is in a state of always being able to receive so that the communication terminal 1 can receive an interrupt signal from the gas meter 70 as a device.
Further, the communication terminal 1 determines the sleep time for each communication method, and thus can appropriately set the sleep time according to the communication method even when the communication method is changed by the device connected to the communication terminal 1 or when the communication method is changed by the device connected to the communication terminal 1. For example, when the communication terminal 1 used by a certain user is used by another user, the device connected to the communication terminal 1 is changed. Further, a case where the communication terminal 1 can be connected to a plurality of devices having different communication systems is also considered. In this case, the sleep time may be determined for each communication method, and the sleep time may be appropriately set according to the communication method.
In addition, in the case where the communication terminal 1 is driven by a battery, power saving is particularly important. When the communication terminal 1 is driven by a battery, if the remaining battery level is equal to or less than the threshold, the communication terminal may shift to a delay mode in which the sleep time is extended. For example, the sleep time in the delay mode may be set to be longer than the sleep time corresponding to the intermittent cycle division D, and in the extension mode, a value obtained by multiplying the sleep time determined in the determination process of the sleep time by a certain coefficient may be used as the sleep time. The coefficient is a value greater than 1. Further, the coefficient may be determined in stages according to the remaining amount of the battery. The coefficient may be determined in stages, for example, the coefficient may be set to 1.5 when the remaining battery level is equal to or less than the 1 st threshold, and the coefficient may be set to 2.0 when the remaining battery level is equal to or less than the 2 nd threshold, which is smaller than the 1 st threshold. Thus, the sleep time determination unit 113 may determine the sleep time based on the remaining battery capacity, in addition to the result of counting the number of communications per time slot, or the result of counting the number of communications per time slot and the response performance.
As described above, in the present embodiment, the sleep time is determined based on the count result of the number of times of communication per time slot, and therefore, in a time slot in which the frequency of communication is high due to maintenance, monitoring, or the like, the responsiveness can be improved by shortening the sleep time, and in a time slot in which the frequency of communication is low, the power saving effect can be improved by lengthening the sleep time. Further, when connected to a device having a poor response performance and a long round trip time, the responsiveness is thereby deteriorated, and therefore, the effect of shortening the sleep time is small. In the present embodiment, the intermittent cycle division is changed based on the response performance, and the sleep time is extended with little effect of shortening the sleep time, thereby improving the power saving effect. That is, the sleep time may be decided based on the round trip time with the device in addition to the counting result of the number of communications per time period, thereby improving the power saving effect. Further, since the sleep time is prolonged when the remaining battery level is equal to or less than the threshold value, power consumption can be suppressed when the remaining battery level is lowered, and the time until the communication terminal 1 stops functioning due to the depletion of the remaining battery level can be prolonged.
The configurations shown in the above embodiments are merely examples, and may be combined with other known techniques, may be combined with each other, and may be partially omitted or modified without departing from the scope of the present invention.
Description of the reference symbols
1. 1-6, 1-10, 1-21, 1-22 communication terminal
2、2-1～2-13、2-21、2-22 SM
7. Automatic gas meter reading system
10. 20, 30 st service system
11. 21, 31 communication system
40. 50 nd service system
70. 70-1-70-6, 70-10 gas meter
71. Communication processing unit
72. 102 control part
73. 105 storage unit
74. Measuring part
100. Antenna with a shield
101. Wireless communication processing unit
103. Connection device communication processing unit
104. Intermittent operation processing part
111. State determination unit
112. Time-meter
113. A sleep time determination unit.

Claims (11)

1. A kind of communication terminal is disclosed, which can be used in the communication terminal,
the communication terminal performs an intermittent operation in which a 1 st state and a 2 nd state, which consumes less power than the 1 st state, are alternately repeated, the communication terminal including:
a 1 st communication processing unit that is capable of communicating with a 2 nd service system for providing a 2 nd service via a communication network constructed for the 1 st service;
a 2 nd communication processing unit, the 2 nd communication processing unit being capable of performing communication with a connected device;
a control unit that, when receiving a control instruction for the device from the 2 nd service system via the 1 st communication processing unit, causes the 2 nd communication processing unit to execute communication processing with the device; and
a sleep time determination unit that determines a sleep time, which is a duration of the 2 nd state, for each of the time slots based on a result of counting the number of times of communication with the device for each of the time slots,
in the 2 nd state, at least the transmission function of the 1 st communication processing unit is stopped.
2. The communication terminal of claim 1,
the sleep time determination unit further determines the sleep time based on a round trip delay time with the device.
3. The communication terminal of claim 1 or 2,
the communication terminal is driven by a battery,
the sleep time determination unit further determines the sleep time based on a remaining battery capacity.
4. The communication terminal according to any of claims 1 to 3,
the sleep time determination unit determines the sleep time for each communication method with the device.
5. The communication terminal according to any of claims 1 to 4,
a storage unit for storing task information indicating a process to be executed in the 1 st state,
the 1 st communication processing unit acquires setting information indicating contents of a setting related to data collection of the device when the device is connected, and transmits the setting information to the control unit,
the control unit includes, in the task information, a process of periodically requesting the device to transmit data when the setting information does not include information indicating that setting for the device to autonomously perform periodic data transmission is valid, and does not include, in the task information, a process of periodically requesting the device to transmit data when the setting information includes information indicating that setting for the device to autonomously perform periodic data transmission is valid.
6. The communication terminal of claim 5,
determining a 1 st period to acquire data from the device and a 2 nd period to transmit the data to the 2 nd serving system, the 2 nd period being longer than the 1 st period,
the control unit includes, in the task information, a process of requesting the device to transmit data in the 1 st cycle if the setting information does not include information indicating that a function of periodically acquiring and holding data is valid, and does not include, in the task information, a process of requesting the device to transmit data in the 1 st cycle if the setting information includes information indicating that a function of periodically acquiring and holding data is valid.
7. The communication terminal of any of claims 1 to 6,
the 1 st service is an automatic meter reading service of the usage amount of electric power.
8. The communication terminal of claim 7,
the 2 nd service is an automatic meter reading service for the usage amount of gas, an automatic meter reading service for the usage amount of tap water, or a monitoring control service based on sensor data.
9. A communication system, comprising:
a communication network constructed for the 1 st service;
a 2 nd service system for providing the 2 nd service; and
a plurality of communication terminals that perform an intermittent operation of alternately repeating a 1 st state and a 2 nd state with power consumption less than that of the 1 st state and that can perform communication for providing the 2 nd service with the 2 nd service system via the communication network, the communication system being characterized in that,
the plurality of communication terminals respectively include:
a 1 st communication processing unit that is communicable with the 2 nd service system via the communication network;
a 2 nd communication processing unit, the 2 nd communication processing unit being capable of performing communication with a connected device;
a control unit that, when receiving a control instruction for the device from the 2 nd service system via the 1 st communication processing unit, causes the 2 nd communication processing unit to execute communication processing with the device; and
a sleep time determination unit that determines a sleep time, which is a duration of the 2 nd state, for each of the time slots based on a result of counting the number of times of communication with the device for each of the time slots,
in the 2 nd state, at least the transmission function of the 1 st communication processing unit is stopped.
10. A power saving control method in a communication terminal,
the communication terminal performs an intermittent operation in which a 1 st state and a 2 nd state, which consumes less power than the 1 st state, are alternately repeated, and includes: a 1 st communication processing unit that is capable of communicating with a 2 nd service system for providing a 2 nd service via a communication network constructed for the 1 st service; and a 2 nd communication processing section, the 2 nd communication processing section being capable of performing communication with a connected device, the power saving control method being characterized in that,
the communication terminal includes:
a 1 st step of causing the 2 nd communication processing unit to execute communication processing with the device when a control instruction for the device is received from the 2 nd service system via the 1 st communication processing unit; and
a 2 nd step of determining a sleep time, which is a duration of the 2 nd state, for each of the time periods based on a result of counting the number of times of communication with the device for each of the time periods,
in the 2 nd state, at least the transmission function of the 1 st communication processing unit is stopped.
11. A power saving control program for causing a communication terminal to execute step 1 and step 2,
the communication terminal performs an intermittent operation in which a 1 st state and a 2 nd state, which consumes less power than the 1 st state, are alternately repeated, and includes: a 1 st communication processing unit that is capable of communicating with a 2 nd service system for providing a 2 nd service via a communication network constructed for the 1 st service; and a 2 nd communication processing section, the 2 nd communication processing section being capable of performing communication with the connected device,
in the step 1, when a control instruction for the device is received from the 2 nd service system via the 1 st communication processing unit, the 2 nd communication processing unit is caused to execute communication processing with the device,
in the step 2, a sleep time, which is a duration of the 2 nd state, is determined for each of the time periods based on a result of counting the number of times of communication with the device for each of the time periods,
in the 2 nd state, the communication terminal stops at least the transmission function of the 1 st communication processing unit.
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