WO2020115816A1 - 端末装置、通信システムおよび通信方法 - Google Patents
端末装置、通信システムおよび通信方法 Download PDFInfo
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- WO2020115816A1 WO2020115816A1 PCT/JP2018/044574 JP2018044574W WO2020115816A1 WO 2020115816 A1 WO2020115816 A1 WO 2020115816A1 JP 2018044574 W JP2018044574 W JP 2018044574W WO 2020115816 A1 WO2020115816 A1 WO 2020115816A1
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- transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/06—Testing, supervising or monitoring using simulated traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
Definitions
- the present invention relates to a terminal device, a communication system, and a communication method that perform communication in a multi-hop communication system.
- a smart meter communication system that adopts the multi-hop communication system is composed of a smart meter that is a terminal device, an aggregation device, and a headend system that is a central processing system.
- the aggregation device and the smart meter communicate with each other by a multi-hop communication method.
- Patent Document 1 discloses a communication system that performs communication by a multi-hop communication method.
- the present invention has been made in view of the above, and to obtain a terminal device capable of improving the throughput of the entire communication system in a communication system using a multi-hop communication method while suppressing the trouble of an operator. To aim.
- the terminal device includes a communication unit that performs wireless communication by the multi-hop communication method. Further, when the terminal device receives the change notification for changing the transmission rate to the second transmission rate higher than the first transmission rate in a state where the transmission rate in the communication unit is set to the first transmission rate, The communication unit is informed of the first test notification, which is a test notification for notifying the wireless communication test at the second transmission rate, at the first transmission rate, and the communication section is notified at the second transmission rate.
- a transmission rate control unit for transmitting a notification signal is provided.
- the transmission rate control unit sets the transmission rate of the communication unit to the second transmission rate in at least a part of the time period when the response to the first notification signal can be received at the second transmission rate, and the transmission rate control unit sets the transmission rate to the constant time. If the response to the first notification signal cannot be received within the first transmission signal, the transmission rate of the communication unit is set to the first transmission rate.
- the terminal device has an effect that the throughput of the entire communication system can be improved in the communication system using the multi-hop communication method while suppressing the trouble of the operator.
- FIG. 3 is a diagram showing a configuration example of a communication system according to the first exemplary embodiment.
- FIG. 3 is a diagram showing a hardware configuration example of a terminal device according to the first embodiment.
- FIG. 3 is a diagram showing a configuration example of a computer system that realizes the central processing system of the first embodiment.
- the flowchart which shows an example of the procedure of the transmission rate change process performed when the terminal device of Embodiment 1 receives the transmission rate change notification from the aggregation device.
- FIG. 3 is a chart diagram showing an example of the flow of processing from the central processing system to the terminal device according to the first embodiment.
- the flowchart which shows an example of the procedure of the transmission rate change process implemented when the terminal device of Embodiment 2 receives the transmission rate change notification from the aggregation device.
- the flowchart which shows an example of the procedure of the transmission rate change process in the terminal device which received the transmission rate test notification of Embodiment 2.
- a terminal device, a communication system, and a communication method according to the embodiments of the present invention will be described below in detail with reference to the drawings.
- the present invention is not limited to this embodiment.
- FIG. 1 is a diagram showing a configuration example of a communication system according to the first exemplary embodiment of the present invention.
- the communication system according to the present embodiment includes terminal devices 1-1 to 1-11 called smart meters, aggregation devices 2-1 and 2-2, and a head end system (HES (Head End End). System)) and a central processing system 3.
- the central processing system 3 is connected to a meter data management system (MDMS (Meter Data Management System)) 4.
- MDMS Metal Data Management System
- the central processing system 3 and the aggregation devices 2-1 and 2-2 are connected by a network 5.
- the network 5 is, for example, an optical line network or a mobile phone network, but is not limited to these.
- each of the terminal devices 1-1 to 1-11 will be referred to as a terminal device 1 when they are shown without distinction, and each of the aggregation devices 2-1 and 2-2 will be shown without distinction.
- 11 terminal devices 1 and 2 aggregation devices 2 are shown respectively, but these are examples, and the number of terminal devices 1 and aggregation devices 2 is limited to the example shown in FIG. 1. Not done.
- Each of the terminal devices 1-1 to 1-11 is installed in a home, a business establishment, etc., measures the amount of electric power in the home, the business establishment, etc., and transmits the measurement result to the corresponding aggregation device 2.
- An aggregation device 2 corresponding to each of the terminal devices 1-1 to 1-11 is defined. The aggregation device 2 aggregates the data transmitted from the terminal devices 1-1 to 1-11, and relays the communication between the terminal devices 1-1 to 1-11 and the central processing system 3.
- the aggregation device 2 and the terminal devices 1-1 to 1-11 communicate by the wireless multi-hop communication method. That is, the aggregation device 2 and the terminal devices 1-1 to 1-11 form a wireless multi-hop network.
- the aggregation device 2 and the terminal devices 1-1 to 1-11 periodically exchange control messages in accordance with the route control protocol and hold route information, that is, information regarding the connection position in the wireless multi-hop network as route information. ..
- An example of the route control protocol is RPL (IPv6 (Internet Protocol version 6) Routing Protocol for Low power and Lossy Network), but the route control protocol is not limited to this.
- the direction of communication from the terminal devices 1-1 to 1-11 to the aggregation device 2 is referred to as an upstream direction
- the direction of communication from the aggregation device 2 to the terminal devices 1-1 to 1-11 is referred to as a downstream direction.
- the route information held by each terminal device 1 stores information indicating the next terminal device 1 or the aggregation device 2 on the upstream route.
- each of the terminal device 1 and the aggregating device 2 forming the wireless multi-hop network is also referred to as a node.
- the next terminal device 1 or aggregation device 2 on the up and down routes of each smart meter is called a next node.
- information indicating a node through which the data is transmitted that is, information indicating the terminal device 1 through which the aggregation device 2 passes may be stored in the data.
- each terminal device 1 may hold the information of the next node for each destination as the route information.
- the terminal device 1 When the terminal device 1 detects a communication failure, it performs a route search according to the route control protocol. In addition, in the present embodiment, the route search is regularly performed. Although there is no particular restriction on the cycle of route search, for example, the route search is performed once a day. In addition, it is assumed that an upper limit is set for the number of hops in the wireless multi-hop network. The upper limit of the number of hops is 20, for example, but the upper limit of the number of hops is not limited to this.
- Each of the terminal devices 1-1 to 1-11 sends the weighing result measured by itself to the corresponding aggregation device 2.
- the terminal device 1 transmits data to the aggregation device 2 specifically, it means that data is transmitted to the next node based on the route information held by each terminal device 1. means.
- the downstream route is designated by the aggregation device 2, for example.
- the aggregation device 2 aggregates the weighing results received from the terminal device 1 and sends them to the central processing system 3 via the network 5.
- the aggregation device 2 is installed, for example, on a telephone pole.
- the central processing system 3 collects the weighing result from the aggregation device 2 and transmits the collected weighing result to the MDMS 4.
- the MDMS 4 manages the weighing result received from the central processing system 3. Further, when the aggregation device 2 receives the data addressed to the terminal device 1 from the central processing system 3, the aggregation device 2 transmits the received data to the terminal device 1.
- the line that connects the nodes that make up the wireless multi-hop network shown in FIG. 1 is an example of a communication path, and the number of nodes to which one node can wirelessly connect is not limited to one.
- the terminal device 1 is usually associated with one aggregation device 2, but a backup aggregation device 2 may be set. Thereby, the terminal device 1 can communicate with the backup aggregation device 2 when a failure occurs in the associated aggregation device 2.
- FIG. 2 is a diagram showing a configuration example of the terminal device 1 according to the present embodiment.
- the terminal device 1 includes a communication unit 11, a transmission rate control unit 12, a communication control unit 13, a control unit 14, and a storage unit 15. Under the control of the communication control unit 13, the communication unit 11 performs wireless communication with another terminal device 1 or the aggregation device 2 by a multi-hop communication method.
- the transmission rate in the communication unit 11 can be changed.
- the speed of the communication unit 11 can be set to any one of three types of transmission rates of 100 kbps, 200 kbps, and 400 kbps, and the transmission rate can be changed among these three transmission rates by setting.
- the number of transmission rates that can be set is not limited to three and may be two or more. Also, the transmission speed is not limited to the three types of examples of 100 kbps, 200 kbps, and 400 kbps described above.
- the transmission rate control unit 12 sets the transmission rate of the communication unit 11 and executes a transmission rate changing process for changing the transmission rate.
- the details of the transmission rate changing process of this embodiment will be described later.
- the communication control unit 13 performs processing according to the route control protocol.
- the communication control unit 13 stores the route information obtained according to the route control protocol in the storage unit 15. Further, the communication control unit 13 controls the communication unit 11 according to the route information so as to transmit the weighing result by a weighing meter (not shown) in the terminal device 1 or connected to the terminal device 1 to the aggregation device 2. To do.
- the measurement result may be output from the meter to the communication unit 11, or may be temporarily stored in the storage unit 15 and read from the storage unit 15 by the control unit 14 and transmitted to the communication unit 11.
- the communication control unit 13 controls the communication unit 11 to transfer the data, which is received from another terminal device 1 via the communication unit 11 and is addressed to the aggregation device 2, to the next node according to the route information. Further, the communication control unit 13 controls the communication unit 11 to transfer the downlink data addressed to the other terminal device 1 according to the route stored in the route information or the data.
- the control unit 14 controls the overall operation of the terminal device 1.
- the control unit 14 controls the terminal device 1 to periodically transmit the measurement result to the central processing system 3, such as a 30-minute cycle. Further, the control unit 14 performs an operation according to the instruction received from the central processing system 3 via the communication unit 11. For example, when a request to send the weighing result is received from the central processing system 3, the weighing result is read from the storage unit 15 and sent via the communication unit 11 according to the instruction. Further, when the transmission rate change notification described later is received from the central processing system 3, the received transmission rate change notification is passed to the transmission rate control unit 12.
- FIG. 3 is a diagram showing a configuration example of the aggregation device 2 according to the present embodiment.
- the aggregation device 2 includes a communication unit 21, a communication control unit 22, a control unit 23, a communication unit 24, and a storage unit 25.
- the communication unit 21 performs wireless communication with the terminal device 1.
- the communication unit 21 stores the weighing result received from the aggregation device 2 in the storage unit 25.
- the transmission speed in the communication unit 21 can be changed.
- the speed of the communication unit 21 can be set to any one of three types of transmission rates of 100 kbps, 200 kbps, and 400 kbps, and the transmission rate can be changed among these three transmission rates by setting.
- the speed of the communication unit 21 can be set to any one of three types of transmission rates of 100 kbps, 200 kbps, and 400 kbps, and the transmission rate can be changed among these three transmission rates by setting.
- the communication control unit 22 executes processing according to the route control protocol.
- the communication control unit 22 stores the route information obtained according to the route control protocol in the storage unit 25.
- the communication unit 24 communicates with the central processing system 3 via the network 5.
- the control unit 23 controls the overall operation of the aggregation device 2. For example, the control unit 23 controls the communication unit 24 so that the weighing results stored in the storage unit 25 are aggregated and transmitted to the central processing system 3. Further, the control unit 23 performs an operation according to the instruction received from the central processing system 3 via the communication unit 24. For example, when the transmission rate change notification is received from the central processing system 3, the received transmission rate change notification is notified to the terminal device 1 via the communication section 21, and the transmission rate of the communication section 21 is notified. Change to the changed transmission rate specified by.
- the aggregation device 2 may include a functional unit similar to the transmission rate control unit 12 of the terminal device 1, and may perform the transmission rate changing process in the same manner as the terminal device 1.
- FIG. 4 is a diagram showing a hardware configuration example of the terminal device 1 according to the present embodiment.
- the terminal device 1 includes a communication circuit 201, a processor 202, and a memory 203.
- the communication unit 11 shown in FIG. 2 is realized by the communication circuit 201.
- the transmission rate control unit 12, the communication control unit 13, and the control unit 14 illustrated in FIG. 2 are realized by the program stored in the memory 203 being read by the processor 202 and executed by the processor 202.
- the memory 203 is also used as a primary memory in each processing executed by the processor 202.
- the storage unit 15 shown in FIG. 2 is realized by the memory 203.
- the programs for realizing the transmission rate control unit 12, the communication control unit 13, and the control unit 14 may be individual programs or may be integrated programs.
- the functions of the transmission rate control unit 12, the communication control unit 13, and the control unit 14 can be updated by rewriting the program stored in the memory 203.
- the hardware configuration example of the aggregation device 2 is the same as that of the terminal device 1, and the configuration example shown in FIG. 4 can be used.
- the communication unit 21 and the communication unit 24 shown in FIG. 3 are realized by the communication circuit 201.
- the communication circuit 201 includes a circuit corresponding to the communication unit 21 and a circuit corresponding to the communication unit 24.
- the communication control unit 22 and the control unit 23 illustrated in FIG. 3 are realized by the program stored in the memory 203 being read by the processor 202 and executed by the processor 202.
- the memory 203 is also used as a primary memory in each processing executed by the processor 202.
- the storage unit 25 shown in FIG. 3 is realized by the memory 203.
- the programs for realizing the communication control unit 22 and the control unit 23 may be individual programs or may be integrated programs.
- the functions of the communication control unit 22 and the control unit 23 can be updated by rewriting the program stored in the memory 203.
- FIG. 5 is a diagram showing a configuration example of the central processing system 3 according to the present embodiment.
- the central processing system 3 includes a communication unit 31, a communication control unit 32, a collection management unit 33, and a storage unit 34.
- the communication unit 31 communicates with the aggregation device 2 via the network 5 and also communicates with the MDMS 4.
- the communication control unit 32 manages communication between the terminal device 1 and the aggregation device 2 via the communication unit 31.
- the communication control unit 32 manages the correspondence between the terminal device 1 and the aggregation device 2, for example.
- the communication control unit 32 when changing the transmission rate of each device in the wireless multi-hop network configured by the terminal device 1 and the aggregation device 2, the communication control unit 32 generates a transmission rate change notification for notifying that the transmission rate is changed. Then, the data is transmitted to the aggregation device 2 via the communication unit 31.
- the collection management unit 33 stores the weighing result received from the aggregation device 2 via the communication unit 31 in the storage unit 34 as weighing information.
- the collection management unit 33 also transmits the weighing information stored in the storage unit 34 to the MDMS 4 via the communication unit 31 at a predetermined timing or when the MDMS 4 makes a request.
- the central processing system 3 is specifically a computer system, that is, a computer. By executing the program in which the processing executed by the central processing system 3 is described on this computer system, the computer system functions as the central processing system 3.
- This program includes a program for causing a computer to execute the process in central processing system 3 in the communication method according to the present embodiment.
- FIG. 6 is a diagram showing a configuration example of a computer system that realizes the central processing system 3 of the present embodiment.
- this computer system includes a control unit 101, an input unit 102, a storage unit 103, a display unit 104, a communication unit 105, and an output unit 106, which are connected via a system bus 107. There is.
- the control unit 101 is, for example, a CPU (Central Processing Unit) or the like.
- the control unit 101 executes the authentication processing program of this embodiment.
- the input unit 102 is composed of, for example, a keyboard and a mouse, and is used by a user of the computer system to input various information.
- the storage unit 103 includes various memories such as a RAM (Random Access Memory) and a ROM (Read Only Memory) and a storage device such as a hard disk, and the programs to be executed by the control unit 101 and necessary obtained in the course of processing. Store data etc.
- the storage unit 103 is also used as a temporary storage area for programs.
- the display unit 104 is composed of an LCD (liquid crystal display panel) or the like, and displays various screens to the user of the computer system.
- the communication unit 105 is a communication circuit or the like that performs communication processing.
- the communication unit 105 may be composed of a plurality of communication circuits corresponding to a plurality of communication systems.
- the output unit 106 is an output interface that outputs data to an external device such as a printer or an external storage device. Note that FIG. 6 is an example, and the configuration of the computer system is not limited to the example of FIG. 6.
- the communication unit 31 shown in FIG. 5 is realized by the communication unit 105, and the communication control unit 32 and the collection management unit 33 shown in FIG. 5 are realized by the control unit 101.
- the storage unit 34 illustrated in FIG. 5 is realized by the storage unit 103.
- the terminal device 1 of the present embodiment may be realized by updating the program in the terminal device that is already installed in each customer, that is, the existing terminal device.
- the existing terminal device that is, the existing smart meter is often compatible with a plurality of transmission rates as hardware.
- at least a part of the terminal device 1 is assumed to be realized by updating the program of the existing terminal device already installed in the customer.
- the existing terminal device also includes the communication unit 11, the communication control unit 13, the control unit 14, and the storage unit 15 illustrated in FIG. 2, and therefore the terminal device 1 according to the present embodiment is the existing terminal device. It is realized by adding the transmission rate control unit 12 to the terminal device.
- the function of the transmission rate control unit 12 is added to the existing terminal device 1 by updating the program of the existing terminal device 1. That is, the transmission rate changing process of the present embodiment can be realized by updating the software of the terminal device 1. Even when the aggregation device 2 executes the transmission rate changing process of the present embodiment, it can be realized similarly by updating the software of the aggregation device 2.
- the terminal device 1 to be added may include the transmission rate control unit 12 from the beginning.
- the central processing system 3 When the user of the central processing system 3 wants to update the programs stored in the terminal device 1 and the aggregation device 2, he/she operates the input unit 102 to update the updated program from an external storage medium not shown in FIG. May be distributed to the terminal device 1 and the aggregation device 2 via the communication unit 31.
- the central processing system 3 receives the updated programs of the terminal device 1 and the aggregation device 2 from an external device (not shown), and distributes them to the terminal device 1 and the aggregation device 2 via the communication unit 31.
- the method of updating the programs of the terminal device 1 and the aggregation device 2 is not limited to the method via the central processing system 3, and even if the programs are updated by directly operating the terminal device 1 and the aggregation device 2, respectively. Good.
- the transmission speed set in the terminal device 1 and the aggregation device 2 before the execution of the transmission speed change processing described later is called the first transmission speed.
- the transmission rate after being changed by the transmission rate changing process is referred to as a second transmission rate.
- the second transmission rate is higher than the first transmission rate.
- the first transmission rate is the transmission rate set when the existing terminal device 1 and the aggregation device 2 are installed in a state where the transmission rate changing process according to the present embodiment has never been executed. ..
- a case where the transmission rates of the existing terminal device 1 and the aggregation device 2 are changed from the transmission rates set when the terminal device 1 and the aggregation device 2 are installed will be described as an example.
- the transmission rate set when the existing terminal device 1 is installed in the customer is, for example, 100 kbps. ..
- the transmission rate changing process is performed to change the transmission rate to 200 kbps
- the first transmission rate is 100 kbps
- the second transmission rate is 200 kbps.
- the setting of the transmission rate can be changed by changing the program stored in each terminal device 1 and each aggregation device 2. That is, the setting of the transmission rate can be changed by changing the software of each terminal device 1.
- the change of the transmission rate setting is performed in the transmission rate changing process described later, but the transmission rate can be changed separately from the transmission rate changing process.
- the user of the central processing system 3 wants to change the transmission rate of each device in the wireless multi-hop network configured by the terminal device 1 and the aggregation device 2, the user controls the communication by operating the input unit 102 shown in FIG.
- the unit 32 is instructed to generate a transmission rate change notification.
- the user also instructs the communication control unit 32 on the changed transmission rate by operating the input unit 102.
- the communication control unit 32 generates a transmission rate change notification including information indicating the changed transmission rate based on the instruction, and transmits the transmission rate change notification to the aggregation device 2 via the communication unit 31.
- the transmission rate changing process of this embodiment will be described. As described above, it is assumed that the terminal device 1 and the aggregation device 2 are communicating at the first transmission rate before the transmission rate changing process is performed. Depending on the distance between the terminal devices 1 and the communication environment, communication may be possible at the first transmission rate but not at the second transmission rate. Therefore, if the transmission rates of all the terminal devices 1 are simply changed to the second transmission rate, a section in which communication is not possible occurs and there is a possibility that some terminal apparatuses 1 cannot communicate with the aggregation device 2. ..
- a route search is executed, and even if an attempt is made to reset the communication route so as to bypass the incommunicable section, there is a terminal device 1 that cannot communicate with any other terminal device 1. Then, the terminal device 1 cannot set the communication path to the aggregation device 2. The aggregation device 2 cannot receive the weighing result from such a terminal device 1, and as a result, the MDMS 4 cannot obtain the weighing result from the terminal device 1. The terminal device 1 that has become unable to communicate after changing to the second transmission speed cannot change the transmission speed back to the first transmission speed according to an instruction from the aggregating device 2. It is necessary to go to the installation location and set again. Thus, if the terminal device 1 that cannot communicate is generated, it takes a lot of time and effort.
- the operator individually considers the installation position of the smart meter to determine whether it is possible to speed up, and based on the result of the determination, the smart meter that can speed up It is conceivable to set the transmission speed of the smart meter to the speed before the speed increase for the smart meter, which will be unable to communicate after the speed increase. As described above, even if the smart meters that can be accelerated are accelerated and some of the smart meters are not accelerated, the throughput of the entire communication system is improved as compared with the case where all the smart meters are not accelerated.
- the terminal device 1 is it possible for the terminal device 1 to perform communication by increasing the transmission speed so that the throughput of the entire communication system can be improved while suppressing the labor of the operator. Perform some test and perform transmission rate change processing to increase the transmission rate when communication is possible.
- FIG. 7 is a flowchart showing an example of a procedure of a transmission rate change process performed when the terminal device 1 according to the present embodiment receives the transmission rate change notification from the aggregation device 2.
- the first process which is the transmission rate change process performed when the terminal device 1 receives the transmission rate change notification from the aggregation device 2, is started by the terminal device 1 receiving the transmission rate change notification from the aggregation device 2. It The transmission rate change notice at this time is a change notice for changing the transmission rate to the second transmission rate which is higher than the first transmission rate.
- the first process is performed in the terminal device 1 that can directly communicate with the aggregation device 2. In the configuration example of FIG. 1, the terminal devices 1-3, 1-4, 1-8 and 1-10 carry out this processing.
- the terminal device 1 that has received the transmission rate change notification from the aggregation device 2 first transmits a transmission rate test notification for notifying the start of the transmission rate test at the first transmission rate (step S1). Specifically, the transmission rate control unit 12 generates a transmission rate test notification, sends the transmission rate test notification to the communication unit 11, and instructs the communication unit 11 to broadcast.
- the transmission rate test notification stores information indicating the second transmission rate, which is the transmission rate of the test target.
- the transmission rate test notification is transmitted by broadcasting. As described below, the terminal device 1 that has received the transmission rate test notification transmits the response to the transmission rate test notification at the first transmission rate and then temporarily changes the transmission rate to the second transmission rate.
- the transmission rate control unit 12 records the terminal device 1 that has responded to the transmission rate test notification in the storage unit 15 (step S2). Next, the transmission rate control unit 12 temporarily changes the transmission rate of the communication unit 11 from the first transmission rate to the second transmission rate (step S3). The transmission rate control unit 12 instructs the communication unit 11 to transmit the beacon signal Beacon Request, and the communication unit 11 transmits the Beacon Request (step S4). Since the transmission rate of the communication unit 11 is temporarily set to the second transmission rate, the Beacon Request is transmitted at the second transmission rate. Beacon Request may be a notification signal that requests a response, and there is no particular restriction on the content.
- the transmission rate control unit 12 determines whether a Beacon Response, which is a response to the Beacon Request, has been received (step S5). Since the transmission rate of the communication unit 11 is temporarily set to the second transmission rate, the BeaconResponse is received at the second transmission rate. In step S5, the communication unit 11 determines Yes if the Beacon Response is received from one or more terminal devices 1 within a fixed time. Further, when the communication unit 11 receives the Beacon Response, the communication unit 11 notifies the transmission rate control unit 12 of the terminal device 1 which is the transmission source of the Beacon Response.
- the communication unit 11 When receiving the Beacon Response, the communication unit 11 transmits ACK (ACKnowledgement), which is a response to the Beacon Response, to the terminal device 1 which is the transmission source of the Beacon Response (step S6).
- ACK acknowledgement
- This ACK is transmitted at the second transmission rate.
- the transmission rate control unit 12 receives the Beacon Response from all the recorded terminal devices 1 based on the terminal device 1 recorded in step S2 and the terminal device 1 that is the transmission source of the Beacon Response notified from the communication unit 11. It is determined whether or not (step S7). Specifically, the terminal device 1 recorded in step S2 is the terminal device 1 that has transmitted a response at the first transmission rate in response to the transmission rate test notification transmitted at the first transmission rate. Therefore, the terminal device 1, which is the transmission source of the transmission rate test notification, can determine that it can communicate with the terminal device 1 recorded in step S2 at the first transmission rate.
- the terminal device 1 that is the transmission rate test notification transmission source is the transmission source of the received Beacon Response. It can be determined that communication with the terminal device 1 is possible at the second transmission rate.
- the terminal device 1 that is the transmission source of the transmission rate test notification determines that the Beacon Responses have been received from all the recorded terminal devices 1, that is, all the terminal devices 1 recorded in step S2, It can be determined that communication with all the terminal devices 1 of the device 1 is possible at the second transmission rate.
- the transmission speed control unit 12 sets the transmission speed of the communication unit 11 to the second transmission speed (step S8), and the process To finish. After that, the terminal device 1 which is the transmission source of the transmission rate test notification performs communication at the second transmission rate.
- the transmission rate control unit 12 sets the transmission rate of the communication unit 11 to the time division transmission rate. Then (step S9), the process ends.
- the terminal device 1 that has not received the Beacon Response can communicate with the terminal device 1 that is the transmission source of the transmission speed test notification at the first transmission speed but at the second transmission speed. It is assumed that it cannot be done.
- the terminal device 1 that can communicate at the first transmission rate but cannot communicate at the second transmission rate is called a terminal device that cannot increase the speed. Therefore, when such a terminal device that cannot be accelerated exists, if the terminal device 1 that is the transmission source of the transmission rate test notification sets the transmission rate to the second transmission rate, the terminal that cannot be accelerated thereafter.
- the device may be unable to communicate with the terminal device 1 that is the transmission source of the transmission rate test notification, and may be unable to communicate with the aggregation device 2.
- the terminal device 1 that is the transmission source of the transmission rate test notification sets the time-division transmission rate in the case of No in step S7 so that communication is performed at the second transmission rate.
- a period for performing communication at the first transmission speed is provided in order to perform communication with the terminal device 1 that cannot be accelerated.
- the transmission rate control unit 12 when the transmission rate control unit 12 receives the transmission rate change notification while the transmission rate in the communication unit 11 is set to the first transmission rate, the transmission rate control unit 12 tests the wireless communication at the second transmission rate.
- the communication unit 11 is caused to notify the first test notification that is a test notification for notifying that the communication is to be performed, and the communication unit 11 is caused to transmit the first notification signal at the second transmission speed.
- the transmission rate control unit 12 sets the transmission rate of the communication unit 11 to the second transmission rate in at least a part of the time zone when the response to the first notification signal can be received at the second transmission rate.
- the transmission rate control unit 12 sets the transmission rate of the communication unit 11 to the first transmission rate when the response to the first notification signal cannot be received within a fixed time.
- the transmission rate control unit 12 records the terminal device 1 that is the transmission source of the response to the first test notification.
- the transmission rate control unit 12 sets the transmission rate of the communication unit 11 to the second transmission rate.
- the transmission rate control unit 12 receives a response to the first notification signal from some of the recorded terminal devices and keeps the response to the first notification signal from the remaining terminal devices of the recorded terminal devices constant. If the signal cannot be received within the time, the transmission rate of the communication unit 11 is set to the first transmission rate during the period T2, which is the first time period, and the second transmission rate is set during the period T1, which is the second time period. Set to the transmission speed.
- FIG. 8 is a conceptual diagram showing an example of setting the time-division transmission rate according to the present embodiment.
- the time-division transmission rate in the present embodiment refers to the transmission rate set for each time zone in which the cycle Ta is time-divided.
- the cycle Ta is divided into two, T1 and T2.
- the communication unit 11 performs communication at the second transmission rate during the period T1, and performs communication at the first transmission rate during the period T2.
- the values of Ta, T1, and T2 are, for example, 30 seconds, 29 seconds, and 1 second, respectively, but the values of Ta, T1, and T2 are not limited to these.
- T1 is set longer than T2.
- the terminal device 1 that is the transmission source of the transmission speed test notification performs communication with the terminal device 1 that cannot increase the speed in the period of T2.
- the terminal device 1 that cannot be speeded up that is, the terminal device 1 that sets the transmission rate to the first transmission rate by performing the second process is the terminal that is the transmission source of the transmission rate test notification that triggered the start of the second process.
- Communication with the device 1 is performed during the period T2.
- the terminal device 1 that cannot increase the speed may be allowed to communicate even during the period T1. Thereby, when the transmission rate test notification can be received from another terminal device 1, the second process can be performed again.
- the transmission rate control unit 12 does not receive any Beacon Response (No in step S5), the transmission rate of the communication unit 11 is set to the first transmission rate (step S10), that is, the communication is performed. The transmission rate of the unit 11 is returned to the transmission rate before the change, and the process ends.
- FIG. 9 is a flowchart showing an example of the procedure of the transmission rate change processing in the terminal device 1 that has received the transmission rate test notification according to the present embodiment.
- the second process which is the transmission rate changing process performed when the terminal device 1 receives the transmission rate test notification from another terminal device 1, is started by the terminal device 1 receiving the transmission rate test notification. ..
- the terminal device 1 that has received the transmission rate test notification transmits a response at the first transmission rate to the terminal device 1 that is the transmission source of the transmission rate test notification, and sets the transmission rate to the first transmission rate.
- a second transmission rate step S11
- the transmission rate control unit 12 which has received the transmission rate test notification via the communication unit 11, instructs the communication unit 11 to transmit a response, and then sets the transmission rate of the communication unit 11 to the first transmission rate. The rate is temporarily changed to the second transmission rate.
- the terminal device 1 determines whether or not the Beacon Request has been received (step S12). Specifically, the transmission rate control unit 12 determines whether the Beacon Request has been received from the terminal device 1 that is the transmission source of the transmission rate test notification via the communication unit 11. When the Beacon Request is received (Yes in step S12), the transmission rate control unit 12 instructs the communication unit 11 to transmit the Beacon Response, and the communication unit 11 transmits the Beacon Response to the terminal device 1 which is the transmission source of the Beacon Request. Yes (step S13). The transmission rate control unit 12 determines whether the ACK corresponding to the Beacon Response transmitted in step S13 is received via the communication unit 11 (step S14). Since the ACK is transmitted at the first transmission rate, the transmission control unit 12 returns the transmission rate of the communication unit 11 to the first transmission rate after transmitting the Beacon Response.
- step S14 If the ACK is received in step S14 (Yes in step S14), the transmission test notification is transmitted at the first transmission rate (step S15), as in step S1 in FIG. Thereafter, steps S16 to S18 are carried out in the same manner as steps S2 to S4 of FIG. After Step S18, when the transmission rate control unit 12 receives the Beacon Response, the transmission rate control unit 12 causes the communication unit 11 to transmit the ACK to the terminal device 1 which is the transmission source of the Beacon Response at the first transmission rate (Step S19).
- steps S20 to S22 are carried out similarly to steps S7 to S9 in FIG.
- the process ends.
- the ACK may be transmitted after step S21 and step S22.
- the transmission rate control unit 12 sets the transmission rate of the communication unit 11 to the first transmission rate (step S23), and ends the process.
- the terminal device 1 that has received the transmission rate test notification sets the transmission rate to the first when the ACK for the Beacon Response is received at the second transmission rate from the terminal device 1 that is the transmission rate test notification source.
- the transmission rate is changed to 2 (step S21), or the transmission rate is set to the time-division transmission rate (step S22).
- the time division transmission rate is the same as the time division transmission rate described in the example of FIG. 7.
- the terminal device 1 of the communication unit 11 Change the transmission rate to the second transmission rate. Then, when the terminal device 1 receives the second notification signal from the other terminal device 1, the terminal device 1 causes the communication unit 11 to transmit the first response which is a response to the second notification signal, and the response to the first response. When the second response, which is, is received, the transmission rate of the communication unit 11 is set to the second transmission rate in at least a part of the time zone. The terminal device 1 sets the transmission rate of the communication unit 11 to the first transmission rate when the response to the first response cannot be received within a fixed time.
- the terminal device 1 When the second response is received, the terminal device 1 causes the communication unit 11 to notify the communication unit 11 of the third test notification, which is a transmission speed test notification, and sets the transmission speed of the communication unit 11 to the first speed.
- the transmission rate is changed to 2
- the third notification signal is transmitted, and when the response to the third notification signal is received, the response to the received response is transmitted.
- the transmission rate control unit 12 when the transmission rate control unit 12 receives the response to the third test notification, the transmission rate control unit 12 records the terminal device that is the transmission source of the response to the third test notification as a peripheral terminal, and the third notification is transmitted from all the peripheral terminals.
- the transmission rate of the communication unit 11 is set to the second transmission rate.
- the transmission rate control unit 12 receives a response to the first notification signal from some of the peripheral terminal devices and also receives a response to the first notification signal from the remaining terminal devices of the peripheral terminals within a certain time. If not possible, the transmission rate of the communication unit 11 is set to the first transmission rate in the first time zone and to the second transmission rate in the second time zone.
- the second process is sequentially performed by the terminal device 1 that has received the transmission rate test notification.
- the central processing system 3 shown in FIG. 1 transmits a transmission rate change notification to the aggregation device 2-2, and the terminal device 1-8 which receives the transmission rate change notification from the aggregation device 2-2 performs the first process. carry out.
- the second processing is executed by the terminal device 1-6 and the terminal device 1-7 which have received the transmission rate test notification transmitted from the terminal device 1-8.
- the terminal device 1-5 performs the second process.
- the second process is sequentially performed by the terminal devices 1 around the terminal device 1 that is the transmission source of the transmission rate test notification.
- FIG. 10 is a diagram in which a part of the configuration example shown in FIG. 1 is extracted.
- a dashed arrow between the terminal devices 1 indicates that communication is possible at both the first transmission rate and the second transmission rate
- a solid arrow between the terminal devices 1 indicates the first transmission rate.
- the terminal device 1-6 and the terminal device 1-8 can communicate at both the first transmission rate and the second transmission rate, and the terminal device 1-8 and the terminal device 1 can communicate with each other.
- -7 can communicate at the first transmission rate but cannot communicate at the second transmission rate.
- the terminal device 1-5 and the terminal device 1-6 can communicate at both the first transmission rate and the second transmission rate.
- FIG. 11 is a chart diagram showing an example of the flow of processing from the central processing system 3 to the terminal device 1 according to the present embodiment.
- FIG. 11 is a chart diagram based on the example shown in FIG.
- solid-line arrows other than the solid-line arrows between the central processing system 3 and the aggregation device 2 indicate transmission at the first transmission rate
- broken-line arrows indicate transmission at the second transmission rate.
- a solid arrow between the central processing system 3 and the aggregation device 2-2 indicates transmission via the network 5.
- the solid line indicates that when the transmission rate change notification is transmitted from the central processing system 3, the aggregation device 2-2 notifies the transmission rate change notification.
- the terminal device 1-8 starts the first process shown in FIG.
- the transmission rate test notification is transmitted from the terminal device 1-8 to the terminal devices 1-6 and 1-7.
- the step numbers shown in FIG. 11 indicate the step numbers in FIGS. 7 and 9. In FIG. 11, a part of the processing shown in FIGS. 7 and 9 is shown, and the illustration of the remaining processing is omitted.
- the terminal devices 1-6 and 1-7 that have received the transmission rate test notification transmitted from the terminal device 1-8 start the second process. As a result, the transmission rates of the terminal device 1-8, the terminal device 1-6, and the terminal device 1-7 are set to the second transmission rate. This process corresponds to step S2 in FIG. 7 and step S11 in FIG.
- the terminal device 1-8 transmits the Beacon Request in step S4 of the first process
- the terminal device 1-6 transmits the Beacon Response because the terminal device 1-6 can communicate with the terminal device 1-8 at the second transmission rate. ..
- the terminal device 1-7 cannot communicate with the terminal device 1-8 at the second transmission rate, it does not send Beacon Response.
- the terminal device 1-8 Upon receiving the Beacon Response from the terminal device 1-6, the terminal device 1-8 transmits ACK in step S6 of the first process. Since the terminal device 1-8 receives the Beacon Response from the terminal device 1-6 and does not receive the Beacon Response from the terminal device 1-7, the transmission rate is set to the time division transmission rate.
- the terminal device 1-7 sets the transmission rate to the first transmission rate in step S23 of the second process.
- the terminal device 1-6 transmits the transmission rate test notification at the first transmission rate in step S15 of the second process.
- the terminal device 1-6 executes the processing of step S16 and subsequent steps shown in FIG. 9, and receives the Beacon Response from the terminal device 1-5, thereby executing step S21 shown in FIG.
- the transmission rate of the terminal device 1-6 is set to the second transmission rate. Since the terminal device 1-5 starts the second process by receiving the transmission rate test notification from the terminal device 1-6, it transmits the transmission rate test notification in S15 of the second process. After that, the continuation of the second processing is performed.
- a periodic route search process or a route search process is performed according to an operator's instruction to establish a communication route between devices that can communicate at the second transmission rate.
- the terminal device 1 having the transmission rate set by time division communicates with the terminal device 1 that cannot increase the transmission speed at the first transmission rate during the period T2, and the data received from the terminal device 1 is transmitted to another terminal during the period T1. Transfer to the device at the second transmission rate. Further, the terminal device 1 which sets the transmission rate by time division cannot speed up the data, which is received from the other terminal device 1 in the period of T1 and cannot be sped up and is addressed to the terminal device 1, at the first transmission rate in the period of T2. Send to the terminal device.
- the terminal device 1 that has already received the transmission rate test notification from a certain terminal device 1 and has already changed the transmission rate to the second transmission rate by the terminal device 1 sequentially performing the second processing, A transmission rate test notification having the second transmission rate as a test target may be received from another terminal device 1.
- the terminal device 1 may perform the second process again by receiving the transmission rate test notification from another terminal device 1, but the transmission rate has already been changed to the second transmission rate. If it has already been changed to, it is not necessary to perform the second processing.
- the terminal device 1 that has set the first transmission rate by the second process again It is desirable to carry out the second process.
- Information indicating the second transmission rate, which is the changed transmission rate is stored. This is because it is possible that even a terminal device 1 that cannot communicate with a certain terminal device 1 at the second transmission rate can communicate with another terminal device 1 at the second second transmission rate. is there.
- the terminal device 1-1 cannot communicate with the terminal device 1-3 at the second transmission rate, but can communicate with the terminal device 1-2 at the second transmission rate. It is also possible. In such a case, the terminal device 1-1 sets the transmission speed to the first transmission speed in the second process by receiving the transmission speed test notification from the terminal device 1-3. -2 is capable of communicating with the terminal device 1-3 at the second transmission rate, it will receive the transmission rate test notification from the terminal device 1-2. In this case, if the terminal device 1-1 performs the second process by receiving the transmission rate test notification from the terminal device 1-2, the transmission rate is set to the second transmission rate or the time division transmission rate. can do.
- the terminal device 1-1 transmits the transmission rate to the terminal device 1-3, which is the transmission source of the transmission rate test notification that triggered the second processing of the first time, or the second transmission rate. You may make it notify that the transmission rate of time division was set. Since the terminal device 1-3 cannot communicate with the terminal device 1-1 at the second transmission speed, the terminal device 1-3 is set to the time division transmission speed. However, the terminal device 1-1 sets the transmission speed to the second transmission speed or When it is notified that the time-division transmission rate is set, if only the terminal device 1-3 among the terminal devices 1 recorded in step S2 that cannot communicate at the second transmission rate, the transmission rate is changed. It is possible to change from the time division transmission rate to the second transmission rate.
- the terminal device 1 does not perform the process of transmitting the transmission rate test notification to another terminal device 1 and transmits the transmission rate.
- the first transmission rate which is the transmission rate before the start of the rate changing process, is set.
- the processing of steps S1 to S10 of FIG. 7 may be performed.
- the terminal device 1 that can communicate only at the first transmission rate as the node next to the upstream of the route information and that can communicate only at the first transmission rate is the first node during the period T1. Communicate at the transmission speed. Further, the terminal device 1 that has the terminal device 1 that has been speeded up as the next node of the route information upstream and that can communicate only at the first transmission rate, communicates with the terminal device 1 that has been speeded up in the period of T2. ..
- the data of the terminal device 1 in this area is transmitted at the second transmission rate during the period T1. If there is no higher-speed terminal device 1 on the upstream route than this area, the data of the terminal device 1 in these areas is transmitted to the aggregation device 2 at the first transmission speed.
- the transmission speed of the terminal device 1 capable of communicating with all the peripheral terminal devices 1 at the second transmission speed is set to the second transmission speed, and some of the peripheral terminal devices 1 are connected.
- the terminal device 1 capable of communicating at the first and second transmission rates is set to the time-division transmission rate.
- the transmission speed of the terminal device 1 that cannot communicate with any of the peripheral terminal devices 1 at the second transmission speed is set to the first transmission speed.
- the operator need only transmit the transmission rate change notification from the central processing system 3. Therefore, in the present embodiment, it is possible to reduce the labor of the operator and improve the throughput of the entire communication system.
- the terminal device 1 may perform the second transmission rate change process for further speeding up after the transmission rate change process of the present embodiment is performed once.
- the above-described first transmission rate is the transmission rate requested to be changed by the previous transmission rate changing process.
- some terminal devices 1 do not actually change the transmission rate after performing the transmission rate changing process. Therefore, when the transmission rate changing process is performed for the second time and thereafter, the transmission rates may be three or more. In this case, when setting the time-division transmission rate, one cycle may be divided into three or more divisions so as to be compatible with three or more types of transmission rates.
- Embodiment 2 Next, the transmission rate changing process according to the second embodiment of the present invention will be described.
- the processing in the transmission rate control unit 12 is partly different from that of the first embodiment, but except this point, the configuration of the communication system of the present embodiment and the configuration of each device constituting the communication system are It is similar to the first embodiment.
- the constituent elements having the same functions as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and the duplicated description will be omitted.
- differences from the first embodiment will be mainly described.
- FIG. 12 is a flowchart showing an example of a procedure of a transmission rate change process performed when the terminal device 1 according to the second embodiment of the present invention receives the transmission rate change notification from the aggregation device 2.
- the terminal device 1 that has received the transmission rate change notification from the aggregation device 2 performs step S1 as in the first embodiment, and then performs steps S3 to S5 as in the first embodiment. Carry out.
- the terminal device 1 executes step S10 as in the first embodiment, and ends the process.
- step S6 is performed as in the first embodiment.
- the transmission rate is set to the time-division transmission rate (step S9), and the process ends. Similar to the first embodiment, the time division transmission rate indicates a transmission rate set for each time zone by dividing the time zone into two as shown in FIG. 8, for example.
- FIG. 13 is a flowchart showing an example of the procedure of the transmission rate change processing in the terminal device 1 that has received the transmission rate test notification according to the present embodiment. Steps S11 to S18 and step S23 are the same as those in the first embodiment.
- the transmission rate control unit 12 of the terminal device 1 determines whether or not the Beacon Response is received (step S24), and when the Beacon Response is received (step S24 Yes), the communication unit 11 is notified of An ACK is transmitted at the first transmission rate to the terminal device 1 which is the transmission source of the Beacon Response (step S19), the transmission rate is set to the time-division transmission rate (step S22), and the process ends.
- step S24 the terminal device 1 determines Yes if at least one Beacon Response is received, as in step S5 of FIG. In the case of No in step S24, the terminal device 1 sets the transmission rate to the time-division transmission rate (step S22), and ends the process. Since step S15 and subsequent steps are performed when the ACK can be received in step S14, in step S24, the Beacon is transmitted from the terminal device 1 that is the transmission source of the transmission rate test notification that triggered the start of the second process. It is assumed that Response can be received at least. Therefore, step S24 normally does not become No.
- the terminal device 1 records the terminal device 1 that can communicate at the first transmission rate, and if it can communicate with all of the recorded terminal devices 1 at the second transmission rate, ,
- the transmission rate is set to the second transmission rate instead of the time division transmission rate.
- the transmission rate control unit 12 sets the transmission rate of the communication unit 11 to the first transmission rate in the first time period when the response to the first notification signal can be received at the second transmission rate.
- the second transmission rate is set in the second time zone.
- the terminal device 1 can communicate with another terminal device 1 during the period of T2. For example, when the terminal device 1 that cannot increase the speed cannot communicate with the terminal device 1 that is the transmission source of the speed test notification, the terminal device 1 that broadcasts data requesting the start of communication during the period of T2 and the terminal device 1 that responded Can communicate.
- the terminal device 1 which has become a communication partner of the terminal device 1 that cannot increase the speed and has a transmission rate set in time division, receives the data received during the period T2 at the second transmission rate according to the route searched for in the route search.
- the data is transmitted to another terminal device 1, and the data received during the period T1 and addressed to the terminal device 1 that cannot be accelerated is transmitted to the terminal device 1 that cannot be accelerated during the period T1.
- the number of terminal devices 1 that perform communication in the period of T2 may increase as compared with the first embodiment. Therefore, in the present embodiment, the ratio of T2 to T1 shown in FIG. 8 may be made larger than that in the first embodiment. For example, when Ta is 30 seconds, T1 can be 25 seconds and T1 can be 5 seconds.
- the route search it is desirable to adjust the route search so that it is performed during the period T1.
- a communication path can be established between the terminal devices 1 that can communicate at the second transmission rate.
- the terminal device 1 that cannot increase the speed can communicate with the terminal device 1 that is the transmission source of the transmission rate test notification at the first transmission rate during the period T2, as in the first embodiment.
- the values of Ta, T1, and T2 are not limited to these. The operation of this embodiment other than that described above is the same as that of the first embodiment.
- the central processing system 3 transmits the transmission rate change notification to the aggregation device 2, and the aggregation device 2 transmits the transmission rate change notification to the terminal device 1 so that it is described above.
- the transmission rate changing process of each embodiment is performed.
- the transmission rate of all the terminal apparatuses 1 may be set to the time-division transmission rate by updating the software of the terminal apparatus 1.
- the software update is performed according to an instruction from the central processing system 3, for example.
- the route search is performed during the period of T1, so that the communication route between the terminal devices 1 that can communicate at the second transmission rate is automatically set.
- Each terminal device 1 preferentially uses the communication route set by the route search performed in the period of T1, and the terminal device 1 that could not set the communication route by the route search in the period of T1 is set in the period of T2. Build a communication route by searching the route.
- the transmission rate is 100 kbps, 200 kbps, and 400 kbps, but the transmission rate is not limited to these, and a higher transmission rate may be used, for example.
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Abstract
Description
図1は、本発明の実施の形態1にかかる通信システムの構成例を示す図である。図1に示すように、本実施の形態の通信システムは、スマートメータと呼ばれる端末装置1-1~1-11と、集約装置2-1,2-2と、ヘッドエンドシステム(HES(Head End System))と呼ばれる中央処理システム3とを備える。中央処理システム3は、メータデータ管理システム(MDMS(Meter Data Management System))4に接続される。中央処理システム3と集約装置2-1,2-2とは、ネットワーク5により接続される。ネットワーク5は、例えば光回線ネットワーク、携帯電話ネットワークであるが、これらに限定されない。
次に、本発明にかかる実施の形態2の伝送速度変更処理について説明する。本実施の形態では、伝送速度制御部12における処理が一部実施の形態1と異なるが、この点を除き、本実施の形態の通信システムの構成、および通信システムを構成する各装置の構成は実施の形態1と同様である。実施の形態1と同様の機能を有する構成要素は実施の形態1と同一の符号を付して重複する説明を省略する。以下、実施の形態1と異なる点を主に説明する。
Claims (13)
- マルチホップ通信方式により無線通信を行う通信部と、
前記通信部における伝送速度が第1の伝送速度に設定されている状態で、伝送速度を前記第1の伝送速度より高速の第2の伝送速度に変更する変更通知を受信すると、前記第2の伝送速度における無線通信の試験を行うことを通知する試験通知である第1の試験通知を前記通信部に前記第1の伝送速度で報知させ、前記通信部に前記第2の伝送速度で第1の報知信号を送信させ、前記第2の伝送速度で前記第1の報知信号に対する応答を受信できた場合に、前記通信部の伝送速度を少なくとも一部の時間帯において前記第2の伝送速度に設定し、一定時間以内に前記第1の報知信号に対する応答を受信できない場合に前記通信部の伝送速度を前記第1の伝送速度に設定する伝送速度制御部と、
を備えることを特徴する端末装置。 - 前記伝送速度制御部は、前記第1の試験通知に対する応答を受信すると、前記第1の試験通知に対する応答の送信元の端末装置を記録し、記録した全端末装置から、前記第1の報知信号に対する応答を受信できた場合に、前記通信部の伝送速度を前記第2の伝送速度に設定し、記録した端末装置のうち一部の端末装置から前記第1の報知信号に対する応答を受信するとともに記録した端末装置のうち残部の端末装置から前記第1の報知信号に対する応答を一定時間以内に受信できない場合に、前記通信部の伝送速度を、第1の時間帯では前記第1の伝送速度に設定するとともに第2の時間帯では前記第2の伝送速度に設定することを特徴とする請求項1に記載の端末装置。
- 前記伝送速度制御部は、前記第2の伝送速度で前記第1の報知信号に対する応答を受信できた場合に、前記通信部の伝送速度を、第1の時間帯では前記第1の伝送速度に設定するとともに第2の時間帯では前記第2の伝送速度に設定することを特徴とする請求項1に記載の端末装置。
- 前記伝送速度制御部は、他の端末装置から、第2の伝送速度における無線通信の試験を行うことを通知する試験通知である第2の試験通知を受信すると、前記通信部の伝送速度を前記第2の伝送速度に変更し、前記他の端末装置から第2の報知信号を受信した場合、前記第2の報知信号に対する応答である第1の応答を前記通信部に送信させ、前記第1の応答に対する応答である第2の応答を受信できた場合に、前記通信部の伝送速度を少なくとも一部の時間帯において前記第2の伝送速度に設定し、前記第1の応答に対する応答を一定時間以内に受信できない場合に前記通信部の伝送速度を前記第1の伝送速度に設定することを特徴とする請求項1または2に記載の端末装置。
- 前記伝送速度制御部は、前記第2の応答を受信できた場合、前記第2の伝送速度における無線通信の試験を行うことを通知する試験通知である第3の試験通知を前記通信部に前記第1の伝送速度で報知させ、前記通信部の伝送速度を前記第2の伝送速度に変更して第3の報知信号を前記通信部に送信させ、前記第3の報知信号に対する応答を受信した場合に、該受信した応答に対する応答を前記通信部に送信させることを特徴とする請求項4に記載の端末装置。
- 前記伝送速度制御部は、前記第3の試験通知に対する応答を受信すると、前記第3の試験通知に対する応答の送信元の端末装置を周辺端末として記録し、前記周辺端末の全てから、前記第3の報知信号に対する応答を受信できた場合に、前記通信部の伝送速度を前記第2の伝送速度に設定し、前記周辺端末のうち一部の端末装置から前記第1の報知信号に対する応答を受信するとともに前記周辺端末のうち残部の端末装置から前記第1の報知信号に対する応答を一定時間以内に受信できない場合に、前記通信部の伝送速度を、第1の時間帯では前記第1の伝送速度に設定するとともに第2の時間帯では前記第2の伝送速度に設定することを特徴とする請求項5に記載の端末装置。
- 前記伝送速度制御部は、他の端末装置から、第2の伝送速度における無線通信の試験を行うことを通知する試験通知である第2の試験通知を受信すると、前記通信部の伝送速度を前記第2の伝送速度に変更し、前記他の端末装置から第2の報知信号を受信した場合、前記第2の報知信号に対する応答である第1の応答を前記通信部に送信させ、前記第1の応答に対する応答である第2の応答を受信できた場合に、前記通信部の伝送速度を少なくとも一部の時間帯において前記第2の伝送速度に設定し、前記第1の応答に対する応答を一定時間以内に受信できない場合に前記通信部の伝送速度を前記第1の伝送速度に設定することを特徴とする請求項3に記載の端末装置。
- 前記伝送速度制御部は、前記第2の応答を受信できた場合、前記第2の伝送速度における無線通信の試験を行うことを通知する試験通知である第3の試験通知を前記通信部に前記第1の伝送速度で報知させ、前記通信部の伝送速度を前記第2の伝送速度に変更して第3の報知信号を送信し、前記第3の報知信号に対する応答を受信した場合に、該受信した応答に対する応答を前記通信部に送信させることを特徴とする請求項7に記載の端末装置。
- 前記伝送速度制御部は、前記第2の応答を受信できた場合に、前記通信部の伝送速度を、第1の時間帯では前記第1の伝送速度に設定するとともに第2の時間帯では前記第2の伝送速度に設定することを特徴とする請求項7または8に記載の端末装置。
- マルチホップ通信方式により無線通信を行う通信部、を備え、
第1の時間帯では前記通信部の伝送速度を第1の伝送速度に設定し、第2の時間帯では前記通信部の伝送速度を第1の伝送速度より高速の第2の伝送速度に設定することを特徴する端末装置。 - 前記端末装置は、電力量を計量するスマートメータであることを特徴とする請求項1から10のいずれか1つに記載の端末装置。
- 第1の端末装置および第2の端末装置を含む複数の端末装置と集約装置とを備え、前記複数の端末装置と前記集約装置とがマルチホップネットワークを構成する通信システムであって、
前記第1の端末装置は、
伝送速度が第1の伝送速度に設定されている状態で、前記集約装置から、伝送速度を前記第1の伝送速度より高速の第2の伝送速度に変更する変更通知を受信すると、前記第2の伝送速度における無線通信の試験を行うことを通知する試験通知を前記第1の伝送速度で報知し、伝送速度を前記第2の伝送速度に変更して報知信号を送信し、前記報知信号に対する応答を受信できた場合に、伝送速度を少なくとも一部の時間帯において前記第2の伝送速度に設定し、一定時間以内に前記報知信号に対する応答を受信できない場合に伝送速度を前記第1の伝送速度に設定し、
前記第2の端末装置は、
前記第1の端末装置から前記試験通知を受信すると、伝送速度を前記第2の伝送速度に変更し、前記報知信号を受信した場合、前記報知信号に対する応答を前記第1の端末装置へ送信する
ことを特徴する通信システム。 - 第1の端末装置および第2の端末装置を含む複数の端末装置と集約装置とを備え、前記複数の端末装置と前記集約装置とがマルチホップネットワークを構成する通信システムにおける通信方法であって、
前記第1の端末装置が、伝送速度が第1の伝送速度に設定されている状態で、前記集約装置から、伝送速度を前記第1の伝送速度より高速の第2の伝送速度に変更する変更通知を受信すると、前記第2の伝送速度における無線通信の試験を行うことを通知する試験通知を前記第1の伝送速度で報知する報知ステップと、
前記第2の端末装置が、前記第1の端末装置から前記試験通知を受信すると、伝送速度を前記第2の伝送速度に変更する変更ステップと、
前記第1の端末装置が、前記報知ステップの後、前記第2の伝送速度で報知信号を送信し、前記第2の伝送速度で前記報知信号に対する応答を受信できた場合に、伝送速度を少なくとも一部の時間帯において前記第2の伝送速度に設定し、一定時間以内に前記報知信号に対する応答を受信できない場合に伝送速度を前記第1の伝送速度に設定する設定ステップと、
を含むことを特徴する通信方法。
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