JP2014064155A - Radio meter-reading system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently collect data from a radio meter-reading device by means of a mobile terminal.SOLUTION: A radio meter-reading system comprises: a plurality of radio meter-reading devices 100, 100A for transmitting data to an upper-level device relaying by radio communication; and a mobile terminal 200 for obtaining data performing radio communication with the plurality of radio meter-reading devices. The mobile terminal simultaneously transmits data transmission requests to the plurality of radio meter-reading devices. When the plurality of radio meter-reading devices receive the data transmission requests from the mobile terminal, they transmit data toward the mobile terminal after prescribed time preset as time different from the other radio meter-reading device passed. The radio meter-reading devices ignore a request for which a response is returned and do not answer again.

Description

  The present invention relates to a wireless meter reading system.

  A system in which a host server acquires data from each power meter at a remote location is known as a so-called AMI (Advanced Metering Infrastructure) system. In such an AMI system, a meter reading value is transmitted from a meter reading device (node) arranged at each consumer to a higher-level server using so-called multi-hop communication.

  However, not all nodes are installed in places where the communication environment is good, and some nodes are installed in places where communication is difficult, such as in mountainous areas, behind buildings, and inside structures. Since a node installed at a location where communication is difficult cannot establish communication with a neighboring node, a communication path with a higher-level server cannot be established. Therefore, a node at a location where communication is difficult cannot enter the communication path with the host server and is isolated.

  The meter reader goes to an area where isolated nodes are scattered by bringing a handy terminal, and acquires data from each isolated node by so-called unicast communication.

  A technique for individually acquiring a meter reading value from an electric power meter using a handy terminal is known (Patent Document 1). In this prior art, a meter reading value is acquired by multi-hop communication from power meters scattered in the site. However, this conventional technology allows meter readers to obtain meter reading values from multiple power meters without moving around the site, and is not intended to obtain meter reading values of isolated nodes from the network. Absent.

  In addition, although it is not the technique regarding a wireless meter-reading system and it is not the technique which acquires data from an isolated node, the technique which made the response time from several nodes differ is known (patent documents 2, 3, 4, and 4). 5, 6).

JP 2009-237964 A JP 2010-213162 A JP 2006-237875 A Japanese Patent Laid-Open No. 10-079753 Japanese Patent Laid-Open No. 11-145991 JP-A-11-252136

  The prior art does not include a viewpoint of efficiently acquiring data from an isolated node that cannot participate in a multi-hop network using a handy terminal, and thus a configuration for that purpose is not disclosed.

  When the handy terminal and the isolated node communicate one-to-one using so-called unicast communication, the larger the number of isolated nodes, the longer the time to acquire data from all the isolated nodes, Work efficiency is greatly reduced.

  On the other hand, in the area where isolated nodes and normal nodes (nodes participating in a multi-hop network) are mixed, when a data transmission is requested by broadcast from a handy terminal, the normal nodes and isolated nodes Respond simultaneously. If a plurality of nodes respond simultaneously, congestion occurs and data may not be received from some isolated nodes.

  Therefore, an object of the present invention is to provide a wireless meter reading system that can efficiently acquire data from a plurality of wireless meter reading devices using a handy terminal.

  In order to solve the above problems, a wireless meter reading system according to the present invention includes a plurality of wireless meter reading devices for relaying data by wireless communication and transmitting the data to a host device, and wireless communication with the plurality of wireless meter reading devices to perform data transmission. And a mobile terminal for acquiring the data, wherein the mobile terminal simultaneously transmits a data transmission request to a plurality of wireless metering devices, and the plurality of wireless metering devices receive a data transmission request from the mobile terminal. Upon reception, the data is transmitted to the mobile terminal after a predetermined time set in advance as a time different from that of the other wireless meter-reading devices has elapsed.

  The mobile terminal transmits the transmission request identification information for identifying the data transmission request included in the data transmission request, and when the plurality of wireless meter reading devices receive the data transmission request including the new transmission request identification information, When data is transmitted to the mobile terminal after a predetermined time has elapsed and another data transmission request including the same transmission request identification information as the transmission request identification information included in the already received data transmission request is received, It is not necessary to respond to the data transmission request.

  According to the present invention, the mobile communication terminal can simultaneously transmit a data transmission request to a plurality of wireless meter reading devices, and the plurality of wireless meter reading devices transmit data to the mobile terminal after elapse of different predetermined times. be able to. Therefore, it is possible to prevent a plurality of wireless meter-reading apparatuses from responding simultaneously and causing congestion, thereby reducing the possibility of data collection omission. As a result, the efficiency and convenience of meter reading work are improved.

  According to the present invention, the wireless meter reading device responds only to a data transmission request including new transmission identification information. For this reason, even when a data transmission request is repeatedly transmitted from a mobile terminal to a plurality of wireless meter-reading apparatuses, it is possible to reduce the number of responses and suppress the occurrence of congestion. Therefore, the possibility of receiving a response from an isolated wireless meter-reading device installed in a place with a poor communication environment is improved, and the efficiency and convenience of meter-reading work are improved.

1 is an overall configuration diagram of a wireless meter reading system. It is a hardware block diagram of a wireless meter-reading apparatus and a handy terminal. It is a flowchart which shows the whole process for collecting data from a wireless meter-reading apparatus using a handy terminal. It is a flowchart which shows the process in which a handy terminal acquires data from a wireless meter-reading apparatus. It is a time chart which shows a mode that data are transmitted at a respectively different timing from the isolated wireless meter-reading apparatus. It is a flowchart which shows the process which concerns on 2nd Example and a handy terminal acquires data from a wireless meter-reading apparatus. It is a flowchart which shows the process which concerns on 3rd Example and a handy terminal acquires data from a wireless meter-reading apparatus. It is a flowchart which shows the process which concerns on 4th Example and a handy terminal acquires data from a wireless meter-reading apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, as will be described in detail below, each wireless meter reading device transmits data to the mobile terminal at different timings in response to a data transmission request broadcast from the mobile terminal. In the following, a wireless meter reading system that acquires power consumption and / or power generation amount from an electric power meter will be described as an example. However, the present invention is not limited thereto, and may be applied to other meter reading systems such as a water meter and a gas meter. Applicable.

  A first embodiment will be described with reference to FIGS. FIG. 1 is an explanatory diagram showing the overall configuration of the wireless meter reading system. A plurality of gateway nodes 10 are connected by wire or wireless under the data collection server 1 which is an example of “higher level device”. A plurality of nodes 100 are connected under each gateway node 10 by multi-hop wireless communication. The node 100 is an example of a “wireless meter reading device”. Note that the data collection server 1 may be referred to as a “top device” or a “higher server”.

  The node 100 is installed in each home, condominium, factory, commercial facility, building, hospital, etc., and creates meter-reading value data indicating the power consumption (or power generation amount) at the installation destination. The node 100 transmits the created meter reading value data to the predetermined gateway node 10 to which the node itself belongs by multi-hop wireless communication.

  If the node 100 can directly transmit data to the predetermined gateway node 10, the node 100 directly transmits the data. For example, the nodes 100 (# 11, # 12, # 21, # 31, # 32) in FIG. 1 transmit data to each predetermined gateway node 10. On the other hand, the node 100 (# 13) located outside the range where it can directly communicate with the predetermined gateway node 10 (# 1) is transferred to the predetermined gateway node 10 via the neighboring node 100 (# 11). Send.

  The gateway node 10 transmits the received data (meter reading value data) to the data collection server 1. The data collection server 1 collects and stores data of each node 100 under the management via each gateway node 10. The data collected by the data collection server 1 is used in other systems such as an energy management system (EMS).

  As shown in the lower part of FIG. 1, among the nodes 100 managed by the data collection server 1, some nodes may be isolated nodes 100A. The isolated node 100A is a node in which a communication path to the data collection server 1 is not established, and is an example of “a predetermined wireless meter reading device that cannot transmit data to a host device”. In other words, the isolated node 100A is a node that cannot participate in the wireless communication network for the data collection server 1 to collect data.

  Depending on the frequency band to be used, transmission power, distance to neighboring nodes, etc., for example, a node 100 that is originally located in an area with a poor communication state such as a mountainous area is likely to become an isolated node 100A. . Further, for example, a node installed inside a building or a structure such as a machine room or a management room may become an isolated node 100A.

  Such an isolated node 100A cannot communicate with the gateway node 10 via a neighboring node. Therefore, the meter reader acquires data from the isolated node 100A by the handy terminal 200 which is an example of the “mobile terminal”, and transmits the acquired data to the data collection server 1. The handy terminal 200 can transmit data to the data collection server 1 via, for example, a communication device (not shown) installed at a sales office or the like.

  In this embodiment, a case will be described in which the handy terminal 200 is configured as a portable terminal possessed by a meter reader. However, instead of the portable terminal, for example, it may be configured as a wireless communication device mounted on a remote control self-propelled vehicle or a helicopter.

  The hardware configuration of the node 100 and the handy terminal 200 will be described with reference to FIG. The node 100 includes, for example, a power supply 101, an auxiliary power supply 102, a baseband LSI, a memory 104, an RF circuit 105, an I / O RTC 106, and an interface circuit 107.

  The power supply 101 is connected to a commercial power supply (not shown) and supplies, for example, a DC power supply and / or an AC power supply to each circuit in the node 100. The auxiliary power source 102 is composed of a battery or the like. The baseband LSI 103 is a circuit for controlling communication processing and has a built-in microcomputer. The memory 104 is configured as a nonvolatile memory such as a flash memory device, for example, and stores meter-reading value data. The RF circuit 105 is a circuit for performing wireless communication via an antenna. An I / O RTC (Input / Output Real Time Clock) 106 is a timer used for managing the acquisition timing of meter reading value data and the transmission timing of meter reading value data. The interface circuit 107 is a circuit for receiving data from the meter-reading target device 108 such as a power meter.

  The handy terminal 200 includes, for example, a power supply 201, an auxiliary power supply 202, a baseband LSI 203, a memory 204, an RF circuit 205, an I / O RTC 206, a signal conversion unit 207, and an operation unit 208. The power supply 201, the auxiliary power supply 202, the baseband LSI 203, the memory 204, the RF circuit 205, and the I / O RTC 206 are the same as the configurations 101 to 106 described in the node 100, and thus redundant description is omitted.

  The signal conversion unit 207 converts the signal input from the operation unit 208 into a predetermined signal and passes it to the baseband LSI 203. The operation unit 208 is a user interface unit for the meter reader to operate the handy terminal 200, and includes, for example, various operation switches, a liquid crystal panel (all not shown), and the like. For example, the handy terminal 200 may be operated by voice without being limited to the switch operation, and the operation result may be output by voice instead of the display.

  The entire process in which the handy terminal 200 acquires data from the isolated node 100A will be described with reference to FIG.

  First, the data collection server 1 acquires the installation status of the node 100 in the management target area (S10). For example, when a new node 100 is installed or an old node is replaced or removed, the administrator or the like inputs information indicating the installation status to the data collection server 1.

  The data collection server 1 determines whether the communication path with each node 100 in the management target area has not been established (S11). That is, the data collection server 1 determines whether one or more nodes 100 for which no communication path is established exist.

  When the communication path between the data collection server 1 and each node 100 is not established, that is, when all the communication paths between the data collection server 1 and each node 100 have been constructed (S11: NO), the data collection server 1 determines whether automatic meter reading can be performed remotely from each node 100 (S12). Automatic meter reading means collecting data (meter reading value data) of each node 100 in the data collection server 1 by multi-hop wireless communication. If automatic meter reading can be performed from each node 100 (S12: YES), this process ends. This is because there is no isolated node 100A that cannot receive data.

  The data collection server 1 negotiates the meter reading timing with the target node as a pre-preparation before acquiring data from the node 100. Based on the record at the time of the negotiation, it can be determined whether or not a communication path with the target node 100 is established.

  However, even when the communication path with the target node has been established, the data collection server 1 cannot always acquire data from the target node. For example, construction or the like is performed near the target node, and the communication environment may be deteriorated by a work vehicle or a structure.

  Therefore, in step S12, it is determined whether data can be acquired from the node where the communication path is constructed. In step S12, for example, based on whether data has been received from the target node at the previous meter reading timing, it can be determined whether communication with the target node is normally performed.

  When at least one communication path with each node 100 has not been established (S11: YES), or when a communication path has been established but automatic meter reading cannot be performed (S12: NO), the data collection server 1 reads “ An isolated node list L is created as an example of “information” (S13). The isolated node list L stores information for identifying the node 100A from which the data collection server 1 cannot acquire data (cannot perform automatic meter reading).

  As information for specifying the node 100A, for example, node identification information for uniquely specifying each node in the wireless meter reading system can be used. The node identification information may be called a node identifier or a node number. The value of the node identification information is used to calculate a unique transmission timing for each node, as will be described later. Other information besides the information specifying the isolated node 100A may be added to the list L. For example, position information indicating the installation location of the isolated node 100A, information indicating the latest time when data was acquired from the isolated node 100A, information indicating the type of the isolated node 100A, and the like may be added to the list L.

  The data collection server 1 transmits the isolated node list L to the handy terminal 200 and ends this processing (S14). In the present embodiment, the case where the data collection server 1 capable of grasping the communication state with each node creates the isolated node list L has been described. Instead, another computer obtains information indicating the communication state with each node from the data collection server 1, creates an isolated node list L based on the information, and transfers the created list L to the handy terminal 200. The structure to do may be sufficient. Alternatively, the isolated node list L may be manually created by an administrator based on the communication state with each node.

  The handy terminal 200 acquires the isolated node list L from the data collection server 1 and stores it in the memory 204 (S20). The handy terminal 200 executes meter reading processing described later using the stored isolated node list L (S21).

  FIG. 4 is a flowchart showing details of step S21 shown in FIG. When the meter reader arrives in the area where the isolated node exists, the meter reading person broadcasts a data transmission request by operating the operation unit 208 of the handy terminal 200 (S210).

  When the isolated node or the normal node receives the data transmission request broadcast from the handy terminal 200 (S211), the isolated node collates the sequence number included in the data transmission request (S212). The sequence number is an example of “transmission request identification information”, and is information for distinguishing data transmission requests transmitted from the handy terminal 200.

  The node holds a sequence number included in a data transmission request that has already been responded, for example, for a certain time or a certain number. Therefore, the node checks whether the sequence number of the data transmission request that has been responded matches the sequence number of the data transmission request received this time (S212).

  When the sequence number of the data transmission request that has been answered matches the sequence number of the data transmission request that has been received this time, the node determines that the data transmission request that has been received this time is a data transmission request that has already been answered (S213: NO), the process ends normally without any response.

  On the other hand, if the sequence number of the data transmission request that has been responded does not match the sequence number of the data transmission request received this time, the node determines that the data transmission request received this time is a new request that has not yet been answered. Determine (S213: YES).

  The node calculates a response delay time as an example of “predetermined time” (S214), and determines the time obtained by adding the response delay time to the current time as the communication timing (S215). The response delay time can be calculated, for example, by multiplying the node identification information (device ID) by a predetermined reference time ts (for example, 100 msec). Since the node identification information is set to have a unique value in the wireless meter reading system, a response delay time unique to the node can be obtained by multiplying the node identification information by a predetermined reference time Ts.

  The node monitors whether the communication timing determined in step S215 has arrived (S216). When the communication timing comes (S216: YES), the node transmits response data (meter reading value data) (S217). The response data includes node identification information of the node that is the data transmission source.

  When the handy terminal 200 receives the data from the node (S218), the handy terminal 200 determines whether the node identification information included in the received data exists in the isolated node list L (S219). Since the node that is not registered in the isolated node list L is a normal node participating in the wireless communication network (S219: NO), the process ends normally without storing the received data. When data is received from a node registered in the isolated node list L (S219: YES), the handy terminal 200 stores the received data in the memory 204 (S220).

  The handy terminal 200 determines whether data has been received from all the isolated nodes registered in the isolated node list L (S221). If there is any isolated node that has not received data, the handy terminal 200 returns to step S210 and broadcasts a data transmission request again. The second and subsequent data transmission requests include the same sequence number as the sequence number used in the first data transmission request. That is, the handy terminal 200 uses the same sequence number until a series of operations of collecting data from an isolated node is completed (S221: YES). Another new sequence number is used for data collection work from isolated nodes in other regions.

  For example, a new request button and a re-request button may be provided on the operation unit 208 of the handy terminal 200. When the meter reader operates the new request button, the handy terminal 200 broadcasts a data transmission request including a new sequence number. When the meter reader operates the re-request button, the handy terminal 200 broadcasts the data transmission request again using the same sequence number issued by the operation of the new request button.

  When the node receives a second data transmission request from the handy terminal 200 (S211), the node collates the sequence number (S212). If it is determined that the data transmission request has already been answered (S213: NO), the node ends the process without responding to the data transmission request retransmitted from the handy terminal 200. Therefore, the node that has already transmitted the response data does not need to perform unnecessary data transmission, and can suppress the occurrence of congestion.

  In this way, when the handy terminal 200 acquires data from the target isolated node (S221: YES), the handy terminal 200 transmits the data stored in the memory 204 to the data collection server 1 (S222). For example, the meter reader can return to the sales office, connect the handy terminal 200 to the communication device, and transmit the data stored in the handy terminal 200 to the data collection server 1. For example, a communication circuit for using a mobile phone communication network may be provided in the handy terminal 200, or a device for using the mobile phone communication network may be connected to the handy terminal 200. The handy terminal 200 can transmit data from the data collection site to the data collection server 1 using a mobile phone communication network.

  FIG. 5 shows an outline of data collection using the handy terminal 200. As shown in FIG. 5A, when not only the isolated node 100A (N41, N42) but also the normal node 100 (N12) is included in the range in which the data transmission request from the handy terminal 200 can be received. Will be explained.

  As shown in FIG. 5B, a first data transmission request is transmitted from the handy terminal 200 (abbreviated as “HT” in FIG. 5B) (Sa). The data transmission request is simultaneously received by each node 100 (N12), 100A (N41), and 100 (N42) within the reception area.

  Each node that has received the data transmission request calculates the response delay time by multiplying the value of its own node identification information (id) and a predetermined reference time (Ts), and when the response delay time elapses from the current time, the handy A response is returned to the terminal 200 (Sd, Sf).

  The handy terminal 200 discards the response from the normal node 100 (N12) and does not store it in the memory 204 (Se). This is because the identification information of the normal node 100 (N12) is not stored in the isolated node list L. On the other hand, the handy terminal 200 stores the response from the isolated node 100A (N41) (Sd).

  Since the response from the other isolated node 100A (N42) described in the isolated node list L has not been acquired, the handy terminal 200 broadcasts the second data transmission request (Sh).

  The normal node 100 (N12) and the isolated node 100A (N41) each respond with a first data transmission request. Therefore, these nodes (N12, N41) compare the sequence number acquired in the first data transmission request with the sequence number of the second data transmission request. The nodes (N12, N41) determine that it is not a new data transmission request, ignore the second data transmission request, and do not respond.

  When the second data transmission request is received by the isolated node 100A (N42), the isolated node 100A (N42) multiplies the identification information (id42) of the own node by a predetermined reference time (Ts) to the own node. A unique response delay time (t42) is calculated (Si). The isolated node 100A (N42) transmits data to the handy terminal 200 when the determined communication timing arrives (Sj).

  When the handy terminal 200 receives data from the isolated node 100A (N42), the handy terminal 200 stores the data in the memory 204 (Sk). The handy terminal 200 transmits the data acquired from each isolated node 100A (N41, N42) to the data collection server 1 (Sl). Note that the handy terminal 200 can finish the data collection operation after repeatedly transmitting the data transmission request a predetermined number of times even if some of the isolated nodes have not responded. Therefore, the determination step of step S221 may be replaced with, for example, “has been transmitted a predetermined number of times?” Or “whether to end the data collection work?”.

  According to this embodiment configured as described above, the handy terminal 200 can request data transmission to a plurality of nodes all at once, and each node responds at different times. Therefore, the occurrence of congestion and adverse effects on data collection can be reduced in advance, and the occurrence of data collection omission can be suppressed. As a result, the efficiency and convenience of meter reading work are improved.

  In this embodiment, the handy terminal 200 stores in the memory 204 only responses from nodes registered in the isolated node list L (nodes for which data could not be acquired in a normal wireless communication network, that is, isolated nodes). Therefore, it is possible to prevent useless data from being stored in the memory 204 and to reduce the memory size.

  Further, the node according to the present embodiment responds only to a new data transmission request, and does not respond to a data transmission request that has already been answered. Therefore, even when the handy terminal 200 repeatedly issues a data transmission request a plurality of times, it is possible to prevent each node from making a useless response and further reduce the possibility of congestion. In addition, it is good also as a structure which determines whether it is the data transmission request which has already responded by using other information instead of a sequence number.

  A second embodiment will be described with reference to FIG. In this embodiment, for isolated nodes that do not respond to the broadcast from the handy terminal 200, data is acquired by unicast communication.

  The process shown in FIG. 6 includes steps S210, S211, and S214 to S222 common to the process described in FIG. 4, and does not include steps S212 and S213 in FIG. Furthermore, a new step S223 is added in the process of FIG.

  When there is an isolated node that does not respond to the broadcast (S221: NO), the handy terminal 200 requests data transmission by unicast to the unresponsive isolated node (S223). That is, the meter reader approaches the installation location of the unanswered isolated node while holding the handy terminal 200, and transmits a data transmission request to the unanswered isolated node (S223). The data transmission request can include node identification information for specifying an unanswered isolated node.

  The isolated node that has received the data transmission request by the unicast method responds to the handy terminal 200 at a predetermined timing (S214 to S217). It may be configured to respond immediately to a unicast data transmission request without waiting for the response delay time to elapse. In this case, the efficiency and convenience of meter reading work are improved. Configuring this embodiment like this also achieves the same effects as the first embodiment.

  A third embodiment will be described with reference to FIG. In this embodiment, even if a data transmission request is broadcast a predetermined number of times Nm, if some of the isolated nodes have not responded, switching to a unicast data transmission request is performed.

  7 includes steps S210 to S222 described in FIG. 4 and step S223 described in FIG. Furthermore, the process of FIG. 7 includes a new step S230.

  The handy terminal 200 determines whether the data transmission request has been broadcast a predetermined number of times Nm (S230). If the data is still not acquired from some isolated nodes even after calling Nm for a predetermined number of times (S221: NO), the handy terminal 200 switches to a unicast data transmission request (S223).

  The sequence number different from the sequence number used in the broadcast data transmission request is used for the unicast data transmission request. Therefore, the node responds when receiving the data transmission request sent by unicast (S217). Configuring this embodiment like this also achieves the same effects as the first embodiment. Further, in the present embodiment, when there is an isolated node that does not respond even if it broadcasts a predetermined number of times Nm, the data reading is individually performed by switching to the unicast method, so that the meter reading operation can be performed efficiently.

  A fourth embodiment will be described with reference to FIG. In this embodiment, a process when a response from a node not registered in the isolated node list L is received will be described.

  When the handy terminal 200 receives the response from the node (S218), the handy terminal 200 determines whether or not the identification information of the node that is the transmission source of the response is registered in the isolated node list L (S219). When the response is from a node that is not registered in the isolated node list (S219: NO), the handy terminal 200 collates with a list in which all nodes in the management area are registered and is not registered in the all node list. Notifies the data collection server 1 (S231). For example, the handy terminal 200 notifies the data collection server 1 of the presence of a suspicious node using a mobile phone communication network from the local site or a communication network from a sales office. Configuring this embodiment like this also achieves the same effects as the first embodiment. Further, in the present embodiment, for example, when an illegally dead copied node and a power meter are used, it can be detected. Furthermore, in the present embodiment, a node that is out of the wireless communication network for data collection can be rediscovered and added to the management target.

  In addition, this invention is not limited to the Example mentioned above. A person skilled in the art can make various additions and changes within the scope of the present invention.

The present invention can be expressed as a method invention as follows: “A plurality of wireless meter reading devices for relaying data by wireless communication and transmitting the data to a host device; and wireless communication with the plurality of wireless meter reading devices to transmit data. A wireless meter reading method using a mobile terminal for acquisition,
The mobile terminal simultaneously transmits a data transmission request including transmission request identification information for identifying a data transmission request to the plurality of wireless meter reading devices,
When the plurality of wireless meter reading devices receive the data transmission request from the mobile terminal and determine that they have received a data transmission request including new transmission request identification information, each of the wireless meter reading devices has a different time from each other. Other data including the same transmission request identification information as the transmission request identification information included in the data transmission request that has already been received after the predetermined time set in advance is transmitted. If a transmission request is received, do not respond to the other data transmission request.
Wireless meter reading method. "

The mobile terminal can be expressed as follows: “A mobile terminal for a wireless meter reading system for acquiring data by performing wireless communication with a plurality of wireless meter reading devices for relaying data by wireless communication and transmitting it to a host device. There,
The mobile terminal
A data transmission request including transmission request identification information for identifying a data transmission request is simultaneously transmitted to the plurality of wireless meter reading devices,
When it is determined that a data transmission request including new transmission request identification information has been received, a predetermined time set in advance as a different time from the other wireless meter reading devices has elapsed, and then from a wireless communication terminal that transmits data. Receive the response,
If the response is stored in meter-reading target information for specifying a predetermined wireless meter-reading device that cannot transmit data to the host device among the plurality of wireless meter-reading devices, the response is stored.
Mobile terminal for wireless meter reading system. "

  1: Data collection server, 10: Gateway node, 100: Node, 100A: Isolated node, 200: Handy terminal

Claims (6)

A wireless meter reading system comprising a plurality of wireless meter reading devices for relaying data by wireless communication and transmitting the data to a host device, and a mobile terminal for performing wireless communication with the plurality of wireless meter reading devices to acquire data. And
The mobile terminal simultaneously transmits a data transmission request to the plurality of wireless meter-reading devices,
Upon receiving the data transmission request from the mobile terminal, the plurality of wireless meter-reading devices send data to the mobile terminal after a predetermined time set in advance as a different time from the other wireless meter-reading devices. Send,
Wireless meter reading system.
The mobile terminal is configured to transmit by including transmission request identification information for identifying a data transmission request in the data transmission request,
The plurality of wireless meter-reading devices, when receiving a data transmission request including new transmission request identification information, transmits data to the mobile terminal after the lapse of the predetermined time.
The wireless meter reading system according to claim 1.
The mobile terminal
Holding meter reading target information for identifying a predetermined wireless meter reading device that cannot transmit data to the host device among the plurality of wireless meter reading devices,
When data is received from the plurality of wireless meter reading devices in response to the data transmission request, only data from the predetermined wireless meter reading device is stored based on the meter reading target information.
The wireless meter reading system according to claim 2.
The host device creates the meter-reading target information when establishing a communication path with the plurality of wireless meter-reading devices, and transfers the created meter-reading target information to the mobile terminal for storage.
The wireless meter reading system according to claim 3.
If there is a predetermined wireless metering device that cannot receive data among the predetermined wireless metering devices even if the mobile terminal transmits the data transmission request at the same time a predetermined number of times at the same time, the mobile terminal Acquire data by sending a dedicated data transmission request to the meter reading device individually.
The wireless meter-reading system in any one of Claim 3 or Claim 4.
The mobile terminal is capable of identifying the plurality of wireless meter reading devices, and when receiving data from a device other than the plurality of wireless meter reading devices, notifies the host device.
5. The wireless meter reading system according to claim 3 or claim 4.

Images