JP6450719B2 - COMMUNICATION SYSTEM, COMMUNICATION TERMINAL, AND COMMUNICATION CONTROL METHOD - Google Patents

Description

  The present invention relates to a communication system, a management device, a communication terminal, and a communication control method capable of controlling the timing at which a communication terminal transmits data.

  Conventionally, a system that collects data output from sensors installed in various places via a wireless communication line is known. Patent Document 1 discloses a data collection system capable of instructing the timing at which a sensor transmits data in a control unit.

JP 2012-221206 A

  In the wireless communication network, processing for periodically disconnecting the wireless communication line is performed in order to prevent the state where the wireless communication line is connected for a long period of time. In the conventional system, since it was not assumed that the wireless communication line is disconnected in this way, data is transmitted at the timing when the wireless communication line is disconnected, and some data cannot be collected. There was a problem.

  Accordingly, the present invention has been made in view of these points, and an object thereof is to provide a communication system, a management device, a communication terminal, and a communication control method for increasing the probability that data transmitted by a communication terminal can be collected. To do.

  The communication system according to the first aspect of the present invention manages a communication terminal that transmits device data output from a communication device to a base station via a wireless communication line, and a timing at which the communication terminal transmits the device data. A management unit, wherein the management unit specifies a disconnection timing that is a timing at which the base station disconnects the wireless communication line, and specifies the disconnection timing specified by the specification unit. A communication control unit that transmits to the communication terminal, and the communication terminal receives a device communication unit that receives the device data, a network communication unit that receives the disconnect timing transmitted by the communication control unit, and The device data received by the device communication unit at a timing other than the disconnection timing received by the network communication unit. And having a terminal control unit for transmitting via the wireless communication line.

  The terminal control unit transmits sector information for identifying the base station to which the communication terminal belongs to the management apparatus, and the communication control unit is configured to disconnect the disconnection timing in the base station identified based on the sector information. May be notified to the communication terminal.

  The communication control unit further notifies a communication terminal of a disconnection period during which the base station disconnects the wireless communication line, and the terminal control unit receives the device received by the device communication unit during a period other than the disconnection period. Data may be transmitted via the wireless communication line.

  The communication control unit may notify the disconnection timing using connection control information used for connection control of the wireless communication line.

  The terminal control unit temporarily stores the device data in the storage unit without transmitting the device data received from the communication device during a predetermined period before the disconnection timing received from the communication control unit. It may be held. The terminal control unit may determine the predetermined period based on a communication delay time between the communication terminal and the base station.

  The terminal control unit may determine the predetermined period based on the amount of the device data received from the communication device. Further, the terminal control unit may determine the predetermined period to have a different length for each application for which the communication device has transmitted the device data.

  The terminal control unit may transmit the device data held in the storage unit after a lapse of random time after the disconnection timing ends.

  A management apparatus according to a second aspect of the present invention is a management apparatus that manages the timing at which a communication terminal that transmits device data output from a communication device to a base station via a wireless communication line transmits the device data. A specifying unit that specifies a disconnection timing that is a timing at which the base station disconnects the wireless communication line; and a communication control unit that transmits the disconnection timing specified by the specifying unit to the communication terminal.

  A communication terminal according to a third aspect of the present invention is a communication terminal that transmits device data output from a communication device to a base station via a wireless communication line, and the communication terminal receives the device data. A communication unit and a disconnection timing that is a timing at which the base station disconnects the wireless communication line is specified, and the device data received by the device communication unit at a timing other than the specified disconnection timing is transmitted to the wireless communication line A terminal control unit for transmitting via the terminal.

  A communication control method according to a fourth aspect of the present invention is a communication control method for controlling the timing at which a communication terminal transmits device data output from a communication device to a base station via a wireless communication line. A step of specifying a disconnection timing, which is a timing at which a base station that provides the wireless communication line used by the communication terminal disconnects the wireless communication line, and a step of transmitting the disconnection timing specified by the computer to the communication terminal And the communication terminal that receives the notification of the disconnection timing transmits the device data received from the communication device at a timing other than the disconnection timing via the wireless communication line.

  According to the present invention, it is possible to increase the probability that data transmitted by a communication terminal can be collected.

It is a figure which shows the structure of the communication system which concerns on embodiment. It is a figure which shows typically the flow of the data in a communication system. It is a figure which shows the structure of a communication terminal. It is a figure which shows the structure of a data management apparatus. It is a figure which shows an example of cutting | disconnection timing DB. It is a figure which shows an example of communication terminal DB. It is a figure which shows the communication sequence in a communication system.

<First Embodiment>
[Configuration of Communication System S]
FIG. 1 is a diagram illustrating a configuration of a communication system S according to the embodiment. The communication system S includes a plurality of communication devices 1 (illustrating communication devices 1a, 1b, and 1c in FIG. 1), a communication terminal 2, a data management device 3, and a data acquisition device 4 (data acquisition device in FIG. 1). 4a, 4b, 4c). The communication terminal 2 can transmit device data received from a plurality of communication devices 1 to the data management device 3 via the communication network N1 and the relay network N2.

  The communication network N1 is a mobile phone network and includes a plurality of base stations 5 (base stations 5a, 5b, and 5c in FIG. 1). Each of the plurality of base stations 5 is eNodeB in LTE (Long Term Evolution), for example. Each of the plurality of base stations 5 is connected to the plurality of communication terminals 2 by wireless communication lines. The communication terminal 2 can transmit device data received from the communication device 1 to the data management apparatus 3 using a wireless communication line provided from the base station 5.

  The relay network N2 is a network including an EPC (Evolved Packet Core) such as an LTE PGW (Packet Data Network Gateway) or an MME (Mobility Management Entity). A plurality of base stations 5 are connected to the relay network N2. The relay network N2 is connected to the data management device 3 via the Internet, for example.

  The base station 5 periodically releases the wireless communication line periodically so that the communication terminal 2 not transmitting / receiving data does not occupy the wireless communication line for a long period of time. Specifically, the base station 5 starts radio communication with the communication terminal 2 and enters an RRC connected (RRC Connected) state, and when a predetermined time (for example, 24 hours) elapses, the base station 5 enters an RRC idle (RRC idle) state. Transition to. In the RRC idle state, the base station 5 cannot normally receive the data transmitted by the communication terminal 2. Therefore, the communication system S is characterized in that control is performed so that the communication terminal 2 does not transmit device data in the RRC idle state.

  The communication device 1 has a sensor, for example, and transmits device data based on the output signal of the sensor to the communication terminal 2. The communication device 1 transmits / receives data to / from the communication terminal 2 via a wireless communication channel suitable for communication at a relatively short distance, such as Wi-Fi (registered trademark), Bluetooth (registered trademark), or the like.

  The communication device 1 is installed in a vending machine, a vehicle, an office, a factory, and the like, and device data including various types of information that can be collected at the installation location is sent to the data management apparatus 3 via the communication terminal 2. Send. When the communication device 1 is installed in, for example, a vending machine, the communication device 1 collects information on temperature, the remaining amount of change, the stock of goods, the presence of surrounding people, and the like, and includes the collected information Data is transmitted to the communication terminal 2.

  The capacity of device data transmitted by the communication device 1 is smaller than the capacity of voice and image data transmitted and received in communication terminals such as smartphones and tablets, and the length of one device data is, for example, 100 bytes or less. . The device data transmitted by the communication device 1 includes a device ID that is identification information assigned to each communication device 1 and data including the collected information.

  The communication terminal 2 receives a plurality of device data from the plurality of communication devices 1. The communication terminal 2 temporarily stores the received device data, and transfers the device data to the data management device 3 by sending the stored device data to the communication network N1 at the timing notified from the data management device 3. To do.

  The data management device 3 is, for example, a server managed by a communication carrier that provides a service using the communication network N1. The data management device 3 provides device data received from the communication terminal 2 to the data acquisition device 4 via the communication network N1 and the relay network N2.

  The data management device 3 collects device data transmitted from the plurality of communication devices 1 via the communication terminal 2 and the communication network N1. The data management device 3 accumulates the received device data in a storage medium such as a hard disk and generates the device data itself or based on the device data in response to a request from the data acquisition device 4 (4a, 4b, 4c) Information is transmitted to the data acquisition device 4.

  The data management device 3 manages the timing at which the communication terminal 2 transmits device data. For example, the data management device 3 notifies the communication terminal 2 of the disconnection timing at which the base station 5 enters the RRC idle state. Although details will be described later, the data management device 3 acquires information on the time until the plurality of base stations 5 enter the RRC idle state after the plurality of base stations 5 enter the RRC idle state, and the period in which the RRC idle state is continued. Based on the acquired information, the communication terminal 2 is notified of disconnect timing information indicating the timing at which the wireless communication line is disconnected.

  The disconnection timing is, for example, a timing at which the RRC idle state starts, but may be a period from the start of the RRC idle state to the end of the RRC idle state. Thus, since the data management device 3 notifies the communication terminal 2 of the disconnection timing, it is possible to prevent the communication terminal 2 from transmitting the device data during a period in which the base station 5 cannot receive the device data. The generation of loss can be avoided.

  The data acquisition device 4 is a computer that can access the data management device 3. The data acquisition device 4 is, for example, a PC (Personal Computer) used by a data acquirer who accesses data transmitted from the communication device 1 to the data management device 3. The contents of the device data transmitted by 1 can be browsed.

  Here, when the communication device 1 is installed in the vending machine, the data acquirer is, for example, a management company of the vending machine, a beverage manufacturer that manufactures products of the vending machine, a company that provides marketing information, or the like. . The data acquirer has signed a contract with a communication carrier that manages the data management apparatus 3 for acquiring device data output by a desired application of the desired communication device 1. The data management device 3 obtains an acquirer ID of each data acquirer, a device ID of one or more communication devices 1 selected by each data acquirer, and an application ID of one or more applications selected by each data acquirer. It is associated and remembered.

  FIG. 2 is a diagram schematically illustrating a data flow in the communication system S. One communication device 1 can execute a plurality of applications corresponding to a plurality of types of information. The communication device 1 shown in FIG. 2 is installed in a vending machine and can execute a temperature application 11, a change management application 12, an inventory management application 13, and a monitoring application 14.

  The temperature application 11 can transmit temperature information indicating the internal temperature of the vending machine. The change management application 12 can transmit change information indicating the change balance of the vending machine. The stock management application 13 can transmit stock information indicating the number of stocks of products sold by the vending machine. The monitoring application 14 can transmit person detection information indicating the time when a person within a predetermined distance is detected from the vending machine.

  Information transmitted by each application is allocated to the data acquisition device 4 registered in advance by the data management device 3. In the example shown in FIG. 2, the temperature information output by the temperature application 11 is transmitted to the data acquisition device 4a of the data acquirer who maintains the vending machine. The change information output by the change management application 12 is transmitted to the data acquisition device 4b of the data acquirer who manages the product. The inventory information output by the inventory management application 13 is transmitted to the data acquisition device 4b and the data acquisition device 4c of the data acquirer that provides the marketing information. The person detection information output by the monitoring application 14 is transmitted to the data acquisition device 4c.

  In addition, the place where the communication device 1 is installed is arbitrary, and may be installed in an automobile, for example. When the communication device 1 is installed in an automobile, the communication device 1 includes the remaining amount of gasoline, the remaining amount of battery, travel data (travel distance, average speed, fuel consumption, number of sudden brakes, etc.), position information, vehicle body defect information, etc. Can be transmitted to the data management device 3.

[Configuration of communication terminal 2]
Next, the configuration and operation of the communication terminal 2 will be described.
FIG. 3 is a diagram illustrating a configuration of the communication terminal 2. The communication terminal 2 includes a device communication unit 21, a network communication unit 22, a storage unit 23, and a terminal control unit 24.

The device communication unit 21 is a wireless communication interface for receiving data transmitted by the communication device 1.
The network communication unit 22 is a wireless communication interface for transmitting and receiving data to and from the base station 5 of the communication network N1 in accordance with, for example, the LTE standard. For example, the network communication unit 22 transmits data received from the communication device 1 to the communication network N1. Further, the network communication unit 22 receives timing information indicating the disconnection timing transmitted by the communication control unit 332 via the communication network N1.

  For example, the network communication unit 22 receives the timing information included in the signaling information that is the connection processing information exchanged with the base station 5 (for example, the eNodeB InActive Timer value), thereby determining the disconnection timing. get. The timing information includes, for example, the time when the base station 5 is scheduled to transition to the RRC idle state. The timing information may include a period in which the RRC idle state continues after the base station 5 transitions to the RRC idle state. The communication system S can effectively notify the communication terminal 2 of the disconnection timing by acquiring the timing information using the signaling information in this way.

  The storage unit 23 includes a storage medium such as a ROM (Read Only Memory), a RAM (Random Access Memory), and a hard disk. The storage unit 23 stores a program executed by the terminal control unit 24. Further, the storage unit 23 stores the device data received from the communication device 1 in association with the device ID of the communication device 1 and the date and time received from the communication device 1 based on the control of the terminal control unit 24.

  The terminal control unit 24 is, for example, a CPU (Central Processing Unit), and executes various processes by executing a program stored in the storage unit 23. The terminal control unit 24 stores device data received via the device communication unit 21 in the storage unit 23. In addition, the terminal control unit 24 transmits the device data received by the device communication unit 21 via the wireless communication line at a timing other than the disconnection timing received by the network communication unit 22 and when the base station 5 transitions to the RRC idle state. Send.

  Specifically, the terminal control unit 24 reads the device data stored in the storage unit 23, and sends the read device data via the network communication unit 22 at a timing other than the disconnection timing notified from the data management device 3. To the communication network N1. The terminal control unit 24 does not transmit device data for a predetermined period from the time corresponding to the disconnection timing. When the network communication unit 22 receives information indicating a period during which the RRC idle state continues, the terminal control unit 24 disconnects from the disconnection timing at which the RRC idle state transitions to the end of the period during which the RRC idle state continues. In the meantime, the device data is held in the storage unit 23 without being transmitted. And the terminal control part 24 transmits device data in periods other than a cutting | disconnection period.

  The terminal control unit 24 transmits sector information for specifying the base station 5 to which the communication terminal 2 belongs to the data management device 3 in order to acquire the disconnection timing of the base station 5 in which the communication terminal 2 is accommodated. The terminal control unit 24 responds to the fact that the communication terminal 2 is powered on and can communicate with the base station 5 or that the base station 5 accommodated by the handover is changed. Sector information is transmitted. The terminal control unit 24 transmits the sector information after a predetermined period has elapsed since the sector was switched in order to prevent the sector information from being frequently transmitted at the sector boundary position. The predetermined period is a period determined based on, for example, the moving speed and moving direction of the communication terminal 2, and is a period in which the probability that the communication terminal 2 returns to the sector before the handover is equal to or less than a predetermined threshold.

  The terminal control unit 24 temporarily stores the device data in the storage unit 23 without transmitting the device data received from the communication device 1 during a predetermined period before the disconnection timing received from the communication control unit 332. May be. The terminal control unit 24 determines the predetermined period based on, for example, the communication delay time between the communication terminal 2 and the base station 5.

  If the disconnection timing is 0: 0: 0, and the communication delay time between the communication terminal 2 and the base station 5 is 500 milliseconds, the terminal control unit 24 sets the disconnection timing to 0: 0: 0. No data is transmitted for 500 milliseconds immediately before. By doing so, it is possible to prevent the device data from reaching the base station 5 due to the RCC idle state while the device data transmitted from the communication terminal 2 is transmitted to the base station 5.

The terminal control unit 24 may determine a predetermined period during which device data is not transmitted before the disconnection timing based on the amount of device data received from the communication device 1. For example, when the amount of device data received from the communication device 1 is 500 bytes and the transmission speed of the wireless communication line is 1 Mbps, 500 ÷ (1 × 10 ⁶ ÷ 8) = 4 mm Second. In this case, the terminal control unit 24 adds the communication delay time of 500 milliseconds, and does not transmit data for 504 milliseconds immediately before 0:00 of the disconnection timing.

The terminal control unit 24 may determine a predetermined period during which no device data is transmitted before the disconnection timing based on the total amount of device data received from all the communication devices 1 that are directly communicating. For example, it is assumed that the communication terminal 2 receives device data from 100 communication devices 1. In this case, assuming that the maximum amount of device data transmitted by each communication device 1 is 500 bytes, the maximum value of the total amount of device data received from all communication devices 1 is 500 × 100 = 50 Kbytes. When the transmission speed of the wireless communication line is 1 Mbps, it is 50000 ÷ (1 × 10 ⁶ ÷ 8) = 400 milliseconds for transmission of 50 Kbytes of data. In this case, the terminal control unit 24 adds the communication delay time of 500 milliseconds, and does not transmit data for 900 milliseconds immediately before 0:00 of the disconnection timing.

  Further, the terminal control unit 24 may determine the predetermined period to have a different length for each application for which the communication device 1 has transmitted device data. For example, when the terminal control unit 24 receives device data output from the communication device 1 by an image-related application that outputs a relatively large amount of data, the terminal control unit 24 does not transmit the device data in the first period immediately before the disconnection timing. When the terminal control unit 24 receives device data output from the communication device 1 by an application that outputs relatively little data, the terminal control unit 24 does not transmit the device data in a second period shorter than the first period immediately before the disconnection timing. By doing in this way, since the terminal control part 24 can transmit device data at a suitable timing according to the application which output the device data which the device communication part 21 received, it transmits while transmitting device data as soon as possible. It is possible to prevent the problem that the received data does not reach the destination.

  The terminal control unit 24 may transmit the device data held in the storage unit 23 after a random time has elapsed after the disconnection timing ends. For example, the terminal control unit 24 generates a random number based on the communication terminal ID of the communication terminal 2, and transmits the device data after a time corresponding to the generated random number has elapsed after the disconnection timing ends. By doing in this way, even if the disconnection timing notified to a large number of communication terminals 2 is the same timing, after the disconnection timing is completed, a large number of communication terminals 2 for shifting to the RRC connection state It is possible to avoid sending information at the same time.

[Configuration of Data Management Device 3]
FIG. 4 is a diagram showing the configuration of the data management device 3. The data management device 3 includes a communication unit 31, a storage unit 32, and a control unit 33. The control unit 33 functions as the specifying unit 331, the communication control unit 332, the request reception unit 333, and the storage control unit 334 by executing the program stored in the storage unit 32.

  The communication unit 31 includes a first communication unit 311 and a second communication unit 312. The first communication unit 311 is a communication interface for transmitting and receiving data to and from the communication terminal 2 via the relay network N2, and has a terminal interface for a mobile phone network, for example. The first communication unit 311 may have a LAN (Local Area Network) interface for connecting to a terminal device of a mobile phone network.

  The second communication unit 312 has a communication interface for transmitting and receiving data to and from the data acquisition device 4 via the relay network N2. The second communication unit 312 is a LAN interface, for example.

  The storage unit 32 includes a storage medium such as a ROM, a RAM, and a hard disk. The storage unit 32 stores a cutting timing DB that the specifying unit 331 refers to when specifying the cutting timing.

  FIG. 5 is a diagram illustrating an example of the cutting timing DB. In the disconnection timing DB, identification information of the base station 5 (hereinafter referred to as base station ID), a communication terminal ID that is identification information of the communication terminal 2 accommodated in each base station 5, and each communication terminal 2 The time at which the connected radio communication line transitions to the RRC idle state is associated with the time at which the RRC idle state continues. The RRC idle transition time is a time at which a predetermined time (for example, 24 hours) determined for each base station 5 has elapsed since the time when the communication terminal 2 started communication with the base station 5.

In addition, the storage unit 32 includes a communication terminal database (hereinafter, referred to as a communication terminal database) in which each communication terminal 2 is associated with a device ID that is identification information of the communication device 1 that can directly communicate with each other without going through the base station 5. Communication terminal DB).
FIG. 6 is a diagram illustrating an example of the communication terminal DB. In the communication terminal DB, in association with the communication terminal ID, the application ID that is the identification information of the application that can be executed by the communication device 1 that can communicate with the communication terminal 2, and the transmission that each application transmits at the time of one data transmission The amount of data is stored.

  In the example illustrated in FIG. 6, the communication terminal 2 with the communication terminal ID 9001 receives data output from the communication device 1 a with the device ID 1001 and the communication device 1 b with the device ID 1002. The communication device 1a can execute an application whose application ID is a51 whose transmission data amount is 10 bytes and an application whose application ID is a52 whose transmission data amount is 20 bytes. The communication device 1b can execute an application whose application ID is a51 whose transmission data amount is 10 bytes and an application whose application ID is a53 whose transmission data amount is 45 bytes.

  The storage unit 32 stores data transmitted from the plurality of communication devices 1 received from the communication terminal 2 in association with the device ID of the communication device 1. Further, the storage unit 32 includes the acquirer ID of the data acquirer who accesses the data management device 3 via the data acquisition device 4, and the communication device 1 and the device ID of the application registered as targets for the data acquirer to acquire data. And a data providing database (hereinafter referred to as a data providing DB) associated with the application ID may be stored.

  The control unit 33 is, for example, a CPU, executes a program stored in the storage unit 32, identifies the disconnection timing to be notified to each communication terminal 2, and notifies the communication terminal 2 of the identified disconnection timing.

  The identifying unit 331, for example, transmits an RRC connection state to the base station 5 from the communication terminal 2 in response to receiving sector information for identifying the base station 5 to which the communication terminal 2 belongs from the communication terminal 2. Request the time of transition to. When the identifying unit 331 acquires from the base station 5 the time when the communication terminal 2 that transmitted the sector information has transitioned to the RRC connection state, the identifying unit 331 adds the time until the base station 5 transitions to the RRC idle state to the acquired time. As a result, the next time of transition to the RRC idle state with the communication terminal 2 is specified. The specifying unit 331 registers the specified RRC idle transition time in the disconnection timing DB and notifies the communication control unit 332 of it. The specifying unit 331 may further acquire the RRC idle duration corresponding to the communication terminal 2 from the base station 5, register the acquired RRC idle duration in the disconnection timing DB, and notify the communication control unit 332 of it.

  The communication control unit 332 controls data transmission / reception with the communication terminal 2. For example, the communication control unit 332 notifies the communication terminal 2 of the RRC idle transition time in the base station 5 that communicates with the communication terminal 2 that has transmitted the sector information, notified from the specifying unit 331. The communication control unit 332 may further notify the communication terminal 2 of a period during which the base station 5 disconnects the wireless communication line with the communication terminal 2 that transmitted the sector information. The communication control unit 332 notifies the disconnection timing and disconnection period, for example, using signaling information used for connection control of a wireless communication line. The communication control unit 332 starts to receive data from the communication terminal 2 by further notifying the communication terminal 2 of an APN (Access Point Name) which is an address of the gateway of the communication network N1.

  The request accepting unit 333 accepts a request for selecting a communication device 1 and an application from which data is acquired from the data acquisition device 4. The request accepting unit 333 transmits a list of communication devices 1 and applications that the data management device 3 collects data to the data acquisition device 4 via the second communication unit 312.

  When the data acquirer selects the communication device 1 and application from which data is to be acquired from the list of communication devices 1 and applications displayed via the data acquisition device 4, the data acquisition device 4 selects the selected communication device 1 and A data acquisition request including information (for example, device ID and application ID) for specifying an application and an acquirer ID is transmitted to the data management apparatus 3. When the request reception unit 333 receives the data acquisition request from the data acquisition device 4, the request reception unit 333 notifies the storage control unit 334 of the acquirer ID, the device ID, and the application ID included in the data acquisition request. Register in the DB for provision.

  When receiving a request for acquiring data from the data acquisition device 4, the request reception unit 333 refers to the data provision DB stored in the storage unit 32 and received via the communication network N 1. The data transmitted by the application indicated by is provided by transmitting to the data acquisition device 4. In the data providing DB, the acquirer ID corresponding to the data acquisition device 4 that transmitted the data acquisition request is associated with the device ID of the communication device that is the target of providing data to the data acquisition device 4 of the acquirer ID. Yes. In the data providing DB, an application ID of an application to be provided with data may be further associated with the data acquisition device 4 having the acquirer ID.

  The request receiving unit 333 may receive a request for selecting the same application executed by the same communication device 1 from the plurality of data acquisition devices 4. When the request receiving unit 333 receives a request for selecting the same application executed by the same communication device 1 from the plurality of data acquisition devices 4, the communication control unit 332 receives data received via the communication network N <b> 1. Among them, the data indicated by the application indicated by the request is provided to the plurality of data acquisition devices 4.

  The storage control unit 334 writes data in the storage unit 32 and reads data stored in the storage unit 32 based on instructions from the specifying unit 331, the communication control unit 332, and the request reception unit 333. For example, the storage control unit 334 stores the device data received by the communication control unit 332 from the communication terminal 2 in the storage unit 32 in association with the device ID and the application ID.

[Communication sequence]
FIG. 7 is a diagram showing a communication sequence in the communication system S.
First, the terminal control unit 24 of the communication terminal 2 monitors whether or not communication with the new base station 5 is started when the power of the communication terminal 2 is turned on or a handover occurs (S11). If it is determined that communication with a new base station 5 has started (YES in S11), the terminal control unit 24 of the communication terminal 2 identifies the sector of the base station 5 (S12), and as information regarding the identified sector, For example, the base station ID is transmitted to the data management device 3.

  In the data management device 3, the specifying unit 331 acquires the time when the RRC connection state is established with the communication terminal 2 from the base station 5, and specifies the disconnection timing based on the acquired information (S13). The communication control unit 332 transmits the disconnect timing specified by the specifying unit 331 to the communication terminal 2.

  Thereafter, when it is time to transmit the collected information (YES in S14), the communication device 1 generates transmission data (S15) and transmits the transmission data to the communication terminal 2. When receiving the transmission data, the terminal control unit 24 of the communication terminal 2 accumulates the received transmission data in the storage unit 23 (S16).

  Subsequently, the terminal control unit 24 of the communication terminal 2 monitors whether or not the current time is within a predetermined range with respect to the disconnection timing (S17). If terminal control unit 24 of communication terminal 2 determines that the current time is different from the disconnection timing (NO in S17), it transmits the transmission data stored in storage unit 23 to data management device 3. When receiving the data, the communication control unit 332 of the data management device 3 registers the received data in the data provision DB in the storage unit 32 in association with the communication terminal ID. In step S17, if the terminal control unit 24 determines that the current time is a time corresponding to the disconnection timing, the terminal control unit 24 stands by without transmitting transmission data.

[Effects of communication system S]
As described above, in the communication system S, the data management device 3 specifies the disconnection timing at which the communication terminal 2 and the base station 5 transition to the RRC idle state, and the specified disconnection timing is transmitted to the communication terminal 2. Notice. The communication terminal 2 transmits the device data received from the communication device 1 at a timing other than the notified disconnection timing. By doing so, it is possible to prevent the loss (packet loss) of the packet including the data transmitted by the communication terminal 2 from occurring, so that the probability that the data management device 3 can collect the data transmitted by the communication terminal 2 is increased. be able to.

<Second Embodiment>
In the first embodiment, the data management device 3 specifies the disconnection timing of the base station 5, whereas in the second embodiment, the communication terminal 2 specifies the disconnection timing of the base station 5. Different from the first embodiment.

  The terminal control unit 24 of the communication terminal 2 according to the second embodiment specifies a disconnection timing that is a timing at which the base station 5 disconnects the wireless communication line, and the device communication unit 21 performs a timing other than the specified disconnection timing. The received device data is transmitted via a wireless communication line. The communication terminal 2 specifies the disconnection timing according to the following procedure, and transmits device data at a timing other than the disconnection timing.

  For example, when the RCC connection state continues for a long time, the terminal control unit 24 acquires the time until the base station 5 makes a transition to the RRC idle state from the base station 5 and causes the storage unit 23 to store the acquired time. Keep it. Then, the terminal control unit 24 is the time until the communication terminal 2 is switched on to the RRC idle state stored in the storage unit 23 at the time when the RRC connection state is first established with the base station 5 after the communication terminal 2 is turned on. Is added to estimate the time for transition to the RRC idle state as the disconnection timing. The terminal control unit 24 executes processing similar to that of the first embodiment based on the estimated disconnection timing, and transmits device data at a time other than the disconnection timing.

  Similar to the first embodiment, the terminal control unit 24 temporarily stores the device data in the storage unit 23 without transmitting the device data received from the communication device 1 during a predetermined period before the disconnection timing. The held device data may be transmitted after the disconnection timing ends and the RRC connection state is established. Further, the terminal control unit 24 may determine a predetermined period based on the communication delay time between the communication terminal 2 and the base station 5. Further, the terminal control unit 24 may determine a predetermined period based on the amount of device data received from the communication device 1. Further, the terminal control unit 24 may determine the predetermined period to have a different length for each application for which the communication device 1 has transmitted device data.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. In particular, the specific embodiments of the distribution / integration of the devices are not limited to those illustrated above, and all or a part thereof may be added in arbitrary units according to various additions or according to functional loads. It can be configured functionally or physically distributed and integrated.

DESCRIPTION OF SYMBOLS 1 Communication device 2 Communication terminal 3 Data management apparatus 21 Device communication part 22 Network communication part 23 Storage part 24 Terminal control part 31 Communication part 311 1st communication part 312 2nd communication part 32 Storage part 33 Control part 331 Specification part 332 Communication control Unit 333 Request accepting unit 334 Storage control unit

Claims (9)

A communication system comprising: a communication terminal that transmits device data output by a communication device to a base station via a wireless communication line; and a management device that manages timing at which the communication terminal transmits the device data.
The management device
A identifying unit that identifies a disconnection timing that is a timing at which the base station disconnects the wireless communication line;
A communication control unit that transmits the disconnect timing specified by the specifying unit to the communication terminal;
Have
The communication terminal is
A device communication unit for receiving the device data;
A network communication unit that receives the disconnect timing transmitted by the communication control unit;
A terminal control unit that transmits the device data received by the device communication unit via the wireless communication line at a timing other than the disconnection timing received by the network communication unit;
I have a,
The terminal control unit determines a predetermined period based on a communication delay time between the communication terminal and the base station, and receives the notification from the communication control unit during the predetermined period before the disconnection timing. A communication system that temporarily stores the device data in a storage unit without transmitting the device data received from the communication device . A communication system comprising: a communication terminal that transmits device data output by a communication device to a base station via a wireless communication line; and a management device that manages timing at which the communication terminal transmits the device data.
The management device
A identifying unit that identifies a disconnection timing that is a timing at which the base station disconnects the wireless communication line;
A communication control unit that transmits the disconnect timing specified by the specifying unit to the communication terminal;
Have
The communication terminal is
A device communication unit for receiving the device data;
A network communication unit that receives the disconnect timing transmitted by the communication control unit;
A terminal control unit that transmits the device data received by the device communication unit via the wireless communication line at a timing other than the disconnection timing received by the network communication unit;
Have
The terminal control unit, based on the amount of the device data received from the communication device, to determine the time of the Jo Tokoro, the in the predetermined period before the cutting timing notified from the communication control unit A communication system that temporarily stores the device data in a storage unit without transmitting the device data received from the communication device . The terminal control unit transmits sector information for identifying the base station to which the communication terminal belongs to the management device,
The communication control unit notifies the communication terminal of the disconnection timing in the base station specified based on the sector information.
The communication system according to claim 1 or 2 . The communication control unit further notifies the communication terminal of a disconnection period during which the base station disconnects the wireless communication line;
The terminal control unit transmits the device data received by the device communication unit via the wireless communication line in a period other than the disconnection period;
The communication system according to any one of claims 1 to 3 . The communication control unit notifies the disconnection timing using connection control information used for connection control of the wireless communication line;
The communication system according to any one of claims 1 to 4 . The terminal control unit determines the predetermined period to a different length for each application for which the communication device has transmitted the device data.
The communication system according to claim 1 or 2 . The terminal control unit transmits the device data held in the storage unit after a lapse of random time from the end of the disconnection timing,
The communication system according to claim 1, 2 or 6 . A communication terminal that transmits device data output by a communication device to a base station via a wireless communication line,
The communication terminal is
A device communication unit for receiving the device data;
The base station specifies a disconnection timing that is a timing for disconnecting the wireless communication line, and transmits the device data received by the device communication unit via the wireless communication line at a timing other than the specified disconnection timing. A terminal control unit,
I have a,
The terminal control unit determines a predetermined period based on a communication delay time between the communication terminal and the base station, and the device data received from the communication device during the predetermined period before the disconnection timing A communication terminal that temporarily stores the device data in a storage unit without transmitting the message. A communication control method for controlling the timing at which a communication terminal transmits device data output from a communication device to a base station via a wireless communication line,
A step in which a computer specifies a disconnection timing that is a timing at which a base station that provides the wireless communication line used by the communication terminal disconnects the wireless communication line;
Transmitting the disconnect timing specified by the computer to the communication terminal;
The communication terminal that has received the notification of the disconnection timing transmits the device data received from the communication device at a timing other than the disconnection timing via the wireless communication line;
I have a,
In the step of transmitting the device data, a predetermined period is determined based on a communication delay time between the communication terminal and the base station, and received from the communication device in the predetermined period before the disconnection timing A communication control method for temporarily storing device data in a storage unit without transmitting the device data .

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