JP7098013B1 - Information processing equipment, information processing equipment control method, information processing equipment control program, and communication system - Google Patents

Abstract

An object of the present invention is to provide countermeasures against phenomena occurring in the operation of an IoT (Internet of Things)/M2M (Machine to Machine) system that employs eDRX (extended discontinuous reception). A communication unit that communicates via a network with a communication device that operates in a power-saving state that receives data intermittently. a control unit that transmits predetermined data to the communication device in response to receiving the transmitted data. [Selection drawing] Fig. 1

Description

The present invention relates to an information processing apparatus, a control method for the information processing apparatus, a control program for the information processing apparatus, and a communication system.

In recent years, with the spread of IoT (Internet of Things) / M2M (Machine to Machine) devices, studies have been promoted to use existing wireless networks for mobile communication (mobile networks / cellular networks) for IoT / M2M communication. ing. For example, the 3GPP (Third Generation Partnership Project), which promotes the formulation of standard specifications for mobile communication systems such as LTE (Long Term Evolution), is standardizing MTC (Machine Type Communication) including IoT / M2M communication. 3GPP discloses, for example, a group of technical specifications (Release) of Non-Patent Documents 1 and 2 regarding IoT / M2M communication.

3GPP TS24.301 V13.6.1, 3rd Generation Partnership Project; Technical Specification Group Core Network and Terminals; Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 (Release 13) 3GPP TS23.682 V13.5.0, 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Architecture enhancements to facilitate communications with packet data networks and applications (Release 13)

An IoT / M2M device that is driven by a battery without being supplied with power from the outside is required to reduce power consumption from the viewpoint of battery life. The above-mentioned Non-Patent Documents 1 and 2 disclose an eDRX (extended Discontinuous Reception) technique as a technique for reducing power consumption of an IoT / M2M device. eDRX is a technique in which an IoT / M2M device intermittently receives a downlink signal and stops the wireless communication function while it is not received.

However, in advancing the operation of the IoT / M2M system adopting eDRX, a phenomenon such as unstable operation of the IoT / M2M device may occur.

The information processing device according to the embodiment of the present invention is a communication unit that communicates via a network between a communication device that operates in a power saving state that intermittently receives data, and data transmitted to the communication device. When the response to is not received from the communication device, the control unit is provided to transmit predetermined data to the communication device in response to receiving the data transmitted from the communication device.

In the information processing apparatus according to the embodiment of the present invention, even if the control unit transmits, as predetermined data, an instruction regarding resetting of the communication path established between the communication apparatus and the own apparatus to the communication apparatus. good.

In the information processing apparatus according to the embodiment of the present invention, the control unit has already transmitted the data to the communication apparatus after the lapse of the first predetermined period after receiving the data indicating that the communication path has been reset, and communicates with the information processing apparatus. Data that has not received a response from the device may be retransmitted to the communication device.

In the information processing apparatus according to the embodiment of the present invention, the control unit is new data that has not been transmitted after a second predetermined period has elapsed after receiving the data indicating that the communication path has been reset. Data requesting a response from the communication device may be transmitted to the communication device.

In the information processing device according to the embodiment of the present invention, the control unit may transmit an instruction to restart the communication device to the communication device as an instruction regarding resetting the communication path.

In the information processing according to the embodiment of the present invention, when the control unit has received the failure information indicating that the communication path has not been established between the communication device and the own device, the data transmitted from the communication device. The predetermined data may be transmitted to the communication device in response to the receipt of the data.

In the information processing according to the embodiment of the present invention, when the control unit receives the data transmitted from the communication device, the control unit refers to the failure information and the communication device has a communication path with the own device. It may be determined whether or not the communication device has not been established.

In the information processing according to the embodiment of the present invention, when the period elapsed after receiving the latest data from the communication device becomes the third predetermined period, the control unit sends a response from the communication device to the communication device. You may send the requested data.

The information processing according to the embodiment of the present invention is for a communication unit that communicates via a network between a communication device that operates in a power saving state that receives data intermittently and data transmitted to the communication device. When the response is not received from the communication device, the control unit includes a control unit for transmitting an instruction regarding re-registration of the communication device in the network in response to receiving the data transmitted from the communication device.

The information processing device according to the embodiment of the present invention is an MME (Mobile Management Entity) arranged in a network, and the communication unit includes the communication device and other information for collecting data transmitted from the communication device. Communication with the processing device is performed, and when the control unit receives data to be transmitted to the communication device from another information processing device, the control unit connects to the communication device with the network at the timing when the communication device can receive the data. If a paging signal requesting the establishment of a wireless session is transmitted and no response to the paging signal is received from the communication device, an instruction regarding re-registration of the communication device is communicated in response to receiving the data transmitted from the communication device. It may be transmitted to the device.

In the information processing according to the embodiment of the present invention, the control unit may transmit an instruction to detach and attach the communication device to the communication device as an instruction regarding re-registration of the communication device.

The control method of the information processing device according to the embodiment of the present invention includes a step of communicating with the information processing device via a network with a communication device operating in a power saving state for intermittently receiving data. When the response to the data transmitted to the communication device is not received from the communication device, the step of transmitting the predetermined data to the communication device in response to the reception of the data transmitted from the communication device is executed.

The control program of the information processing device according to the embodiment of the present invention has a function of communicating via a network with a communication device operating in a power saving state that intermittently receives data, and transmission to the communication device. When the response to the data is not received from the communication device, the function of transmitting predetermined data to the communication device in response to the reception of the data transmitted from the communication device is realized.

A communication system according to an embodiment of the present invention includes a communication device that operates in a power-saving state that intermittently receives data, and an information processing device that communicates via a network between the communication devices. In a system, when the information processing device does not receive a response to the data transmitted to the communication device from the communication device, the information processing device transmits predetermined data to the communication device in response to receiving the data transmitted from the communication device. The communication device includes a first control unit, and the communication device includes a second control unit that executes a predetermined process according to the reception of predetermined data.

In the communication device according to the embodiment of the present invention, the second control unit may receive an instruction to restart the own device as predetermined data and execute the restart of the own device.

In the communication device according to the embodiment of the present invention, when the second control unit restarts its own device, the attachment process to the network may be executed.

FIG. 1 is a functional block diagram schematically showing a communication system, a communication device, and a server (information processing device) according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an outline of eDRX. FIG. 3 is a sequence diagram illustrating an outline of downlink data transmission to a communication device operating on eDRX. FIG. 4 is a sequence diagram illustrating an outline of uplink data transmission from a communication device operating on eDRX. FIG. 5 is a diagram showing an example of a sequence between a communication device, a core network, and a server according to an embodiment of the present invention. FIG. 6 is a diagram showing an example of a sequence between a communication device, a core network, and a server according to an embodiment of the present invention. FIG. 7 is a diagram showing an example of a sequence between a communication device, a core network, and a server according to an embodiment of the present invention. FIG. 8 is a diagram showing an example of a sequence between a communication device, a core network, and a server according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

<System configuration>
FIG. 1 is a diagram showing a configuration example of a communication system according to an embodiment of the present invention. The communication system 500 may be a system that realizes IoT / M2M. The IoT (Internet of Things) may refer to a mechanism in which various things are connected to the Internet to enable data collection, remote control, and the like. Further, M2M (Machine to Machine) may refer to a mechanism for exchanging data between devices. In M2M, the devices may be connected to each other via the Internet or may be directly connected to each other. Hereinafter, a case where the communication system 500 uses wireless communication by LTE as a network for realizing IoT / M2M will be described. However, the present invention is not limited to LTE, and for example, wireless communication based on a 5th generation (5G) communication standard, a 6th generation (6G) or later communication standard, or the like may be used.

The communication system 500 includes a server (information processing device) 100, a communication device (UE: User Equipment) 300 (300A, 300B, 300C), and a network 400. The network 400 may be composed of a radio network (E-UTRAN (Evolved Universal Terrestrial Radio Network)) composed of a base station (eNB: eNodeB) 200 and a core network (EPC: Evolved Packet Core) 10. .. Although each node constituting the communication system 500 is shown separately in FIG. 1, the functions of a plurality of nodes may be incorporated in one hardware. Each component constituting the communication device 300, the base station 200, and the EPC 10 may be a computer device operated by the processor executing a program stored in the memory.

The base station 200 establishes a wireless session (RRC Connection) with the communication device 300 and directly communicates with the base station 200, and transfers a packet between the core network 10 and the communication device 300. Therefore, the base station 200 accepts a transmission (notification of uplink data) from the communication device 300, or transmits paging (Paging) for calling the communication device 300 when there is downlink data for the communication device 300. To do.

The EPC 10 includes an MME (Mobility Management Entity) 110, an S-GW (Serving Gateway) 120, and a P-GW (Packet Data Network Gateway) 130. The MME 110 has functions such as position management of the communication device 300, authentication management, and session management between each node (that is, management of a communication path (bearer)). The MME 110 also has a function of transmitting paging to the base station 200 when calling the communication device 300. The S-GW 120 has a function as a gateway for routing and forwarding user packets between the base station 200 and the EPC 10. The P-GW 130 assigns an IP (Internet Protocol) address of the communication device 300 that can be used in the network 400, and functions as a gateway that enables communication between the communication device 300 and the external network of the network 400 by the IP address. Has. The S-GW 120 and the P-GW 130 may be integrated and realized as one node, and thereafter, the integrated case may be indicated as the S / P-GW 120/130.

The communication device 300 may be an IoT device in one embodiment of the present invention. In the example of FIG. 1, three communication devices 300 are shown, but the number of communication devices 300 is not limited to this. Hereinafter, when it is not necessary to make a distinction, the alphabetic characters in the code of the communication device 300 will be omitted.

In the communication system 500 according to one embodiment, the server 100 may have a function of managing IoT / M2M devices via a network 400 and collecting various data transmitted from the IoT / M2M devices. For example, the server 100 can collect information about the meter from a communication device 300 installed in, for example, a meter, which is an IoT / M2M device installed in each home, company, facility, or the like. That is, the server 100 may have a function as an IoT-PF (platform) that processes information transmitted from each communication device 300 and passes necessary data to the administrator of each communication device 300. Therefore, a centralized monitoring center (not shown) by the administrator may be connected to the server 100. Further, the server 100 may remotely control the communication device 300 via the network 400. The meter may measure, for example, the amount of water, gas (city gas, LP gas), oil, electricity, and the like used. The present invention does not limit the IoT / M2M device to a meter. Further, the object measured by the meter is not limited to the above example. That is, the server 100 may collect arbitrary information according to the measurement target of the meter. Although the server 100 is shown as a single unit in FIG. 1, the server 100 is not limited to this. The server 100 may be any device as long as it can realize the functions described in each embodiment. For example, the server 100 may include a server device, a computer (not limited to, for example, a desktop, a laptop, a tablet, etc.), a communication platform, and the like.

The network 400 may include an HSS (Home Subscriber Server) and an MTC-IWF (Machine Type Communications-Interworking Function) (not shown). The HSS is a node that manages authentication processing and location information of the communication device 300. The MTC-IWF is connected to the server 100 and the MME 110, and transfers data between the server 100 and the EPC 10.

<Server>
The server 100 includes a control unit 101, a communication unit 102, and a storage unit 105. The storage unit 105 is typically realized by various recording media such as an HDD (Hard Disc Drive), SSD (Solid State Drive), and flash memory, and stores various programs and data required for operating the server 100. It may have a function to memorize. Further, the storage unit 105 may store information about the communication device 300 and the meter for communicating with the server 100. For example, the storage unit 105 relates to a device ID that is an identifier that can uniquely identify each communication device 300, position information of the communication device 300, a meter ID that is an identifier that can uniquely identify the meter, and a meter manager. The administrator ID, the network ID required for communication with the communication device 300 via the network 400, and the like may be stored. The network ID may be, for example, an IP address assigned to the communication device 300 by the P-GW 130 at the time of establishing a bearer (communication path) with the communication device 300.

The control unit 101 may typically be a central processing unit (CPU). The control unit 101 may execute the functions and methods shown in each embodiment by reading the program stored in the storage unit 105 and executing the code or instruction included in the read program. The control unit 101 realizes each process disclosed in each embodiment by a logic circuit (hardware) or a dedicated circuit formed in an integrated circuit (IC (Integrated Circuit) chip, LSI (Large Scale Integration)) or the like. May be good. Further, these circuits may be realized by one or a plurality of integrated circuits, and a plurality of processes shown in each embodiment may be realized by one integrated circuit.

The communication unit 102 may be implemented as hardware such as a network adapter, communication software, or a combination thereof. The communication unit 102 may transmit and receive various data via the network 400 by using the bearer established between the server 100 and each communication device 300.

<Communication device>
The communication device 300 may include a control unit 310, a communication unit 320, and a storage unit 350. The control unit 310 and the communication unit 320 constituting the communication device 300 may be software or modules whose processing is executed by the processor executing a program stored in the memory. Alternatively, the component constituting the communication device 300 may be hardware such as a circuit or a chip. In one embodiment of the present invention, the control unit 310 may realize a process for operating the communication device 300 in accordance with LTE. Further, although the details will be described later, the control unit 310 may cause the communication device 300 to execute the eDRX operation, which is an operation in a power saving state in which data is intermittently received. Further, the control unit 310 may have a function of acquiring various information from a meter (not shown). Further, the control unit 310 may execute various processes for restarting the own device, connecting to the network 400, and disconnecting from the network 400.

The communication unit 320 may be implemented as hardware that realizes a data transmission / reception function in wireless communication, communication software, and a combination thereof. The communication unit 320 may transmit and receive various data to and from the server 100 via the network 400, and may transmit various data received from the server 100 to the control unit 310. The communication unit 320 includes a first communication unit (not shown), and may perform communication with the server 100 using the first communication method. The first communication method is, for example, a wireless communication method for IoT such as category M (Category M), category M1 (Category M1), NB-IoT (Narrow Band IoT), and is an extension of LTE (Long Term Evolution). Communication method may be used. Further, the first communication method may be, for example, a communication method (public radio) that requires a license under the Radio Law.

The storage unit 350 stores various programs and various data required for the communication device 300 to operate. The storage unit 350 may include, for example, a semiconductor memory (magnetic memory, flash memory, etc.). Further, the storage unit 350 may include a memory (RAM (Random Access Memory), ROM (Read Only Memory), etc.) that provides a work area for the control unit 101. Further, in one embodiment of the present invention, the storage unit 350 has various parameters for executing the eDRX operation, various network parameters for connecting to the network 400 (for example, an IP address, etc.), and identification unique to the communication device 300. Information (device ID, etc.) may be stored.

<About eDRX>
Here, the outline of eDRX will be described with reference to FIG. In FIG. 2, the horizontal axis represents time, and the vertical axis illustrates the on / off state of the wireless function of the communication device 300. eDRX is a wireless technology that extends LPWA (Low Power Wide Area) for realizing low power consumption in LTE for IoT / M2M devices, and is a communication standard of category M, category M1, NB-IoT, etc. It is a function.

In LTE, the communication device 300 has two states: a connection state (RRC_CONNECTED) in which there is a wireless session with the base station 200, and an idle state (RRC_IDLE) (standby state) in which there is no wireless session with the base station 200. Transition the state. The idle state may be a state in which the function of the communication device 300 is restricted more than the connected state. For example, the communication device 300 can send and receive data to and from the base station 200 in the connected state, but may only receive data in the idle state. Specifically, for example, the communication device 300 may be capable of only paging and receiving broadcast information with the base station 200 in an idle state. When the communication device 300 in the idle state receives the paging, the communication device 300 in the idle state may release the idle state and establish a wireless session with the base station 200.

Here, as described above, since the communication device 300 attempts to receive paging, it consumes standby power even in the idle state. On the other hand, the communication device 300 may control the reception of paging by eDRX in the idle state. For example, the communication device 300 may intermittently execute the reception of paging in the idle state. That is, the communication device 300 may stop the wireless function of its own device during the period when it does not try to receive the paging. Specifically, as illustrated in FIG. 2, the communication device 300 may turn on the wireless function at the timing of attempting to receive the paging, and turn off the wireless function at other times. That is, the communication device 300 may operate in a power saving state in which power consumption can be reduced by intermittently receiving data. In FIG. 2, the PTW (Paging Time Window) represents a section in which the communication device 300 during eDRX operation tries to receive paging. Further, in FIG. 2, the eDRX cycle represents an on / off cycle of the radio function. That is, the eDRX cycle represents the period from the beginning of PTW to the beginning of the next PTW. Therefore, the communication device 300 can control the power consumption of the communication device 300 in the idle state by setting the length of the PTW and the cycle until the next PTW (eDRX cycle).

The communication device 300, the base station 200, and the MME 110 may share information about the eDRX cycle set for each communication device 300. That is, the communication device 300, the base station 200, and the MME 110 may each calculate at what timing the communication device 300 becomes the PTW. Then, the communication device 300, the base station 200, and the MME 110 may be synchronized based on the information of the PTW of the communication device 300. As a result, the base station 200 can send the paging to the communication device 300 at the timing when the communication device 300 can receive the paging.

<Sequence between the communication device and the network during eDRX operation>
FIG. 3 is a sequence diagram illustrating a case where data is transmitted from the server 100 to the communication device 300 in the idle state that performs the eDRX operation. In the subsequent sequence diagrams including FIG. 3, the S-GW 120 and the P-GW 130 are shown integrally. Further, in FIG. 3, the attachment process of the communication device 300 to the network 400 is completed, and the information (context information) about the communication device 300 is held in the network 400 (more specifically, the MME 110). It shall be. Further, it is assumed that the registration process (Registration) of the communication device 300 with the server 100 is completed, and the server 100 is in a state where communication can be executed with the communication device 300 as a management target.

The control unit 101 of the server 100 transmits data to be transmitted to the communication device 300 to the S / P-GW 120/130 via the communication unit 102 (step S11). The S / P-GW 120/130 buffers the data received from the server 100 (step S12) and notifies the MME 110 that there is data to be transmitted to the communication device 300 (step S13). The MME 110 transmits a response to the data notification to the S / P-GW 120/130 (step S14). The MME 110 calculates the time to be the next PTW from the information about the eDRX cycle of the communication device 300, and includes the information about the necessary buffering period in the response to the S / P-GW 120/130. May be good. The MME 110 suspends the transmission of paging to the communication device 300 until the communication device 300 becomes a PTW (step S15).

The MME 110 transmits paging to the base station 200 (step S16). At this time, the MME 110 transmits the paging at the timing of the PTW in the communication device 300 so that the base station 200 can transmit the paging to the communication device 300 at that timing. Upon receiving the paging from the MME 110, the base station 200 transmits the paging to the communication device 300 (step S17). After receiving the paging, the base station 200 buffers the paging until the PTW timing, and transmits the paging to the communication device 300 when the PTW timing is reached. Therefore, the accuracy of synchronization between the MME 110 and the base station 200 is improved so that the base station 200 can transmit the paging to the communication device 300 without delay after receiving the paging from the MME 110. It is preferable to reduce the amount of buffer in the base station 200.

The communication device 300 that received the paging during the PTW executes a wireless session establishment process (RRC Connection Procedure) with the base station 200. As a result, a wireless session between the communication device 300 and the base station 200 is established (step S18). After that, a bearer between the communication device 300, the base station 200, the S / P-GW 120/130, and the server 100 is set through a predetermined procedure (step S19). When the bearer is set, the data buffered in the S / P-GW 120/130 is transmitted to the communication device 300 (step S20). After that, the base station 200 releases the wireless session with the communication device 300 (step S21). The release of the wireless session may be performed by the base station 200 by setting a time from the establishment of the wireless session to the release in advance and using the expiration of the time as a trigger. The release of the wireless session may be performed by the communication device 300. For example, the communication device 300 may release the radio session when it cannot be properly synchronized with the base station 200. The communication device 300, which has released the wireless session and has become idle, continues to perform intermittent paging reception according to the eDRX cycle.

The transmission of uplink data (transmission by the communication device 300) from the communication device 300 to the network 400 can be performed at any timing without depending on the eDRX cycle. FIG. 4 is a sequence diagram illustrating a case where data is transmitted from the communication device 300 to the network 400. Also in FIG. 4, it is assumed that the attachment process of the communication device 300 to the network 400 is completed, and the information (context information) about the communication device 300 is held in the network 400.

The control unit 310 of the communication device 300 transmits a connection request (RRC Connection Request) for establishing a wireless session with the base station 200 via the communication unit 320 (step S31). The base station 200 transmits connection information (RRC Connection Setup) for establishing a wireless session to the communication device 300 (step S32). After that, a wireless session between the communication device 300 and the base station 200 is established (step S33). Next, the communication device 300 transmits a bearer setting request to the network 400. After that, a bearer between the communication device 300, the base station 200, the S / P-GW 120/130, and the server 100 is set through a predetermined procedure (step S34). When the bearer is set, the communication device 300 transmits data to the server 100 via a predetermined node (step S35). After that, the communication device 300 releases the wireless session with the base station 200 (step S36).

<First Embodiment>
FIG. 5 is an example of a sequence between the communication device 300 and the server 100 according to the first embodiment of the present invention. Note that FIG. 5 is an example, and the present invention is not limited thereto. FIG. 5 is a sequence diagram illustrating a case where data is transmitted from the server 100 to the idle state communication device 300 that performs the eDRX operation, as in FIG. Similar to FIG. 3, the attachment process of the communication device 300 to the network 400 is completed, and the information about the communication device 300 is held in the network 400.

Since steps P11 to P16 are the same as steps S11 to S16 in FIG. 3, description thereof will be omitted. Here, in step P17, the paging transmitted from the base station 200 to the communication device 300 may not reach the communication device 300 due to some reason such as a calculation error of the PTW timing or deterioration of the communication environment. The case where the paging does not reach the communication device 300 is not limited to the case where the paging does not physically reach the communication device 300. For example, the case where the paging does not reach the communication device 300 may include a case where the paging is not received by the communication device 300, a case where the communication device 300 rejects the reception, a case where the communication device 300 cannot recognize the paging, and the like.

In this case, since the MME 110 does not receive a response to paging such as a bearer setting request from the communication device 300, it may be determined that the paging has failed (step P18). Then, the MME 110 may transmit information indicating that the paging has failed to the S / P-GW 120/130 (step P19). The S / P-GW 120/130 may send information indicating that paging has failed to the server 100 (step P20), and may delete the buffered data. The server 100 may store the failure of paging in the storage unit 105 as a history (step P21).

After that, it is assumed that the communication device 300 needs to be connected to the network 400, for example, by periodically transmitting meter reading data. In this case, the communication device 300 establishes a wireless session with the base station 200 through a predetermined procedure (step P23). Then, the communication device 300 transitions from the idle state to the connected state, and transmits a bearer setting request to the network 400. After that, a bearer may be set between the communication device 300, the base station 200, the S / P-GW 120/130, and the server 100 through a predetermined procedure (step P24). The communication device 300 may transmit data to the server 100 using the set bearer (step P25).

In the operation of the IoT / M2M system that employs eDRX, there may be a problem that the communication device 300 can make a call, but the server 100 cannot make a call. According to one embodiment of the present invention, such a problem can be solved.

This will be described in detail. Upon receiving the data from the communication device 300 in step P25, the server 100 may determine that the communication device 300 is a communication device that failed to paging by referring to the processing history stored in the storage unit 105. .. Then, the server 100 may transmit an instruction (Reboot) for restarting the communication device 300 to the communication device 300 (step P26). The S / P-GW 120/130 may transmit an instruction to restart the communication device 300 received from the server 100 to the communication device 300 by using the bearer set at the time of transmission by the communication device 300 (step). P27).

Even if the cause is unknown, the above-mentioned problem that paging cannot be transmitted from the server 100 to the communication device 300 may be solved by restarting the communication device 300. Further, even if it is impossible to establish a wireless session between the base station 200 and the communication device 300 by paging, data can be reached to the communication device 300 by using the bearer set by the transmission of the communication device 300. Can be made to. In this respect, according to one embodiment of the present invention, a restart instruction can be transmitted by using a bearer setting by transmission of the communication device 300 as a trigger to solve the problem.

It should be noted that the restart instruction needs to be transmitted while the wireless session between the communication device 300 and the base station 200 is established. Therefore, in order to accelerate the transmission of the restart instruction, the determination of whether or not the communication device 300 has failed in paging is performed at the timing when the server 100 receives the information indicating that the bearer has been established. You may be broken. Then, immediately after receiving the data from the communication device 300, a restart instruction may be transmitted to the communication device 300.

Upon receiving the restart instruction, the communication device 300 may release the wireless session with the base station 200 (step P28). The communication device 300 may transmit to the base station 200 that its own device will be restarted, and the base station 200 may release the wireless session. After that, the communication device 300 may restart its own device (step P30). Before the communication device 300 is restarted, the communication device 300 may transmit the detach information for canceling the registration of the own device to the network 400 to the network 400. Alternatively, each node of the network 400 may read the restart instruction transmitted from the server 100 and recognize that the communication device 300 is restarted. As a result, the registration status of the communication device 300 can be matched between the network 400 and the communication device 300.

FIG. 6 shows an example of the sequence after the communication device 300 is restarted. When the communication device 300 is restarted in step P30, the communication device 300 establishes a wireless session with the base station 200 through a predetermined procedure (steps P31 to P33). After that, the communication device 300 executes the attachment request to the network 400 and the bearer setting request (step P34), and the attachment process of the communication device 300 to the network 400 is completed through a predetermined procedure. Further, a bearer between the communication device 300 and the server 100 via the network 400 is set. After that, the communication device 300 may transmit a registration request (Registration) to the server 100 (step P35). The registration request is transmitted to establish communication with the server 100, and may include an identification name (Endpoint Client Name) of the communication device 300, an expiration date (Lifetime) of registration, and the like. The server 100 that has received the registration request from the communication device 300 can register the communication device 300 as a communication target. After that, the server 100 may transmit the registration completion information indicating that the registration is completed to the communication device 300 (step P36). The communication device 300 or the base station 200 may release the wireless session when data transmission / reception does not occur for a predetermined time, and the communication device 300 may transition to the idle state (step P37).

The fact that the server 100 receives the registration request in step P35 indicates that the communication device 300 has been restarted and the bearer has been reset between the communication device 300 and the server 100. According to one embodiment of the present invention, the control unit 101 of the server 100 has been transmitted to the communication device 300 after a lapse of a first predetermined period after receiving the data indicating that the bearer has been reset. The data for which the response from the communication device 300 has not been received may be retransmitted to the communication device 300. That is, in step P38, the server 100 may retransmit the data that tried to transmit to the communication device 300 in step P11 of FIG. 5, but did not reach the communication device 300. After that, the data from the server 100 may be retransmitted to the communication device 300 through the same steps P38 to P47 as in steps S11 to S20 of FIG. The length of the first predetermined period is not particularly limited. For example, the length of the first predetermined period may be a length that allows the server 100 to confirm whether or not data can be transmitted to the communication device 300 operating the eDRX without any problem. Specifically, for example, the length of the first predetermined period may be the period required from the restart of the communication device 300 to the transition to the idle state at least once.

As a result, after the communication device 300 is restarted, it is possible to confirm whether or not the wireless session can be established without any problem and to transmit the untransmitted data to the communication device 300.

The data retransmitted in step P38 does not have to be the data that has not been transmitted to the communication device 300. According to one embodiment of the present invention, the control unit 101 of the server 100 receives new data that has not been transmitted to the communication device 300 after a second predetermined period has elapsed after receiving the data indicating that the bearer has been reset. Therefore, data requesting a response from the communication device 300 may be transmitted to the communication device 300. That is, in step P38, the test data may be transmitted to the communication device 300. The test data may be light data in which the test data itself and the response from the communication device 300 do not overwhelm the network resources. Further, the length of the second predetermined period is not particularly limited. For example, the second predetermined period may be a length that allows the server 100 to confirm whether data can be transmitted to the communication device 300 operating the eDRX without any problem, as in the first predetermined period.

This makes it possible to confirm whether or not the wireless session can be established without any problem after the communication device 300 is restarted.

<Second Embodiment>
In the first embodiment, a case where the communication device 300 is restarted has been described as a method for resolving the unstable state of the network with the communication device 300. However, according to one embodiment of the present invention, the method for resolving the unstable state of the network is not limited to restarting the communication device 300. For example, according to another embodiment of the present invention, the unstable state of the network can be resolved by prompting the resetting of the bearer established between the communication device 300 and the server 100. That is, according to another embodiment of the present invention, for example, the detachment process between the server 100 and the communication device 300 may be executed triggered by the bearer setting process. This will be described as the second embodiment.

FIG. 7 is an example of a sequence between the communication device 300 and the server 100 according to the second embodiment of the present invention. Note that FIG. 7 is an example, and the present invention is not limited thereto. FIG. 7 is a sequence diagram illustrating a case where data is transmitted from the server 100 to the idle state communication device 300 that performs the eDRX operation, as in FIG. Similar to FIG. 5, the attachment process of the communication device 300 to the network 400 is completed, and the information about the communication device 300 is held in the network 400.

Since steps T11 to T20 are the same as steps P11 to P20 in FIG. 5, the description thereof will be omitted. In the first embodiment of FIG. 5, the server 100 remembers that paging has failed. On the other hand, in the second embodiment, the MME 110 may remember that the paging has failed (step T21). After that, similarly to steps P23 to P25 of FIG. 5, the communication device 300 may establish a wireless session with the base station 200 and transmit data to the server 100 through a predetermined procedure (steps T23 to P25). T25).

Unlike the first embodiment, in the second embodiment, the MME 110 that has received the data from the communication device 300 in step T25 may send a detach request to the communication device 300 (step T26). The detach request may also be transmitted to the server 100. The communication device 300 that has received the detach request executes the detach process for the network 400 (step T27). Here, detaching means canceling the registration of the communication device 300 in the network 400 and deleting the information about the communication device 300 from the network 400. The detach request may be transmitted at any time after the establishment of the wireless session from the communication device 300. Here, the wireless session may be released by an instruction from the base station 200, for example, when data transmission / reception does not occur for a predetermined time. Therefore, the detach request may be transmitted, for example, based on the instruction from the base station 200 before the session is released. That is, for example, the detach request may be transmitted after the establishment of the wireless session from the communication device 300 and before the predetermined time elapses. The communication device 300 that has been detached needs to be attached to the network 400. That is, the attachment process to the network 400 and the registration process to the server 100 can be completed through the same processes as in steps P31 to P37 of FIG.

According to the second embodiment of the present invention, the attachment process can increase the possibility of resolving the problem that the registration to the network 400 is restarted from the beginning and the paging to the communication device 300 fails.

In the second embodiment, the instruction transmitted from the MME 110 to the communication device 300 is not limited to the detach instruction, and may be an instruction to restart the communication device 300. As a result, the unstable state of the communication system 500 can be eliminated as in the first embodiment.

<Third Embodiment>
FIG. 8 is an example of a sequence between the communication device 300 and the server 100 according to the third embodiment of the present invention. Note that FIG. 8 is an example, and the present invention is not limited thereto. Here, since steps U11 to U23 in FIG. 8 are the same as steps T11 to T23 in FIG. 7, the description thereof will be omitted. In the second embodiment, as illustrated in FIG. 7, after the wireless session in step T23 is established, the detachment process is executed when the bearer is set in step T24. Here, according to still another embodiment of the present invention, as illustrated in FIG. 8, after the wireless session of step U23 is established, a service request from the communication device 300 to the base station 200 is transmitted in step U24. The detachment process may be executed in the wake of this. Specifically, for example, in the third embodiment, the MME 110 that has received the service request from the communication device 300 in step U24 may transmit the detach request to the communication device 300 (step U25). The communication device 300 that has received the detach request may execute the detach process for the network 400 (step U26). Thereby, according to the third embodiment of the present invention, the unstable state of the communication system 500 can be eliminated.

<Other embodiments>
The frequency with which the communication device 300 transmits / receives data to / from the server 100 is lower in the case of the IoT / M2M device than in the case of the mobile phone. Therefore, there is a possibility that the above-mentioned problems in data transmission / reception cannot be found. Therefore, there may be a mechanism that can detect a defect between the communication device 300 and the base station 200 at an early stage. According to one embodiment of the present invention, the control unit 101 of the server 100 sends the communication device to the communication device 300 when the period elapsed after receiving the latest data from the communication device 300 becomes the third predetermined period. Data requesting a response from 300 may be transmitted. When the data requesting a response is transmitted from the server 100 to the communication device 300 and the response from the communication device 300 is not received, it can be determined that the above-mentioned problem has occurred. The third predetermined period is not limited, but may be 12 hours, 24 hours, 3 days, or the like. The third predetermined period may be fluidly changed according to the frequency of occurrence of defects. This makes it possible to detect defects at an early stage and eliminate the unstable state of the system.

Although the present invention has been described with reference to the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and modifications based on the present disclosure. Therefore, it should be noted that these modifications and modifications are included in the scope of the present invention. For example, the functions included in each component, each step, etc. can be rearranged so as not to be logically inconsistent, and a plurality of components, steps, etc. can be combined or divided into one, as needed. Can be omitted or changed as appropriate. Further, the configurations shown in the above embodiments may be appropriately combined. For example, each functional unit described as being included in the server 100 may be realized by any of the nodes in the core network 10. On the contrary, the server 100 may include each functional unit described as being provided by any of the nodes in the core network 10.

For example, in the above description, in step P26 of FIG. 5, an instruction for restarting the communication device 300 is transmitted from the server 100 to the communication device 300. However, in one embodiment of the present invention, the server 100 may retransmit the data that did not reach the communication device 300 instead of the restart instruction.

For example, in the above description, the case where the detach request is transmitted from the MME 110 to the communication device 300 has been described. However, information instructing the restart may be transmitted from the MME 110 to the communication device 300.

Further, the data transmitted from the server 100 and buffered by the P-GW 130 may be buffered by the server 100 or may be buffered by the MME 110.

Further, in the above description, the communication system compliant with eDRX has been described. However, the present invention is not limited to this, and may be applicable when a communication method or protocol that can make the connection state between the communication device 300 and the network 400 unstable is used.

The program of each embodiment of the present disclosure may be provided in a state of being stored in a storage medium readable by a communication device or an information processing device. The storage medium may be capable of storing the program in a "non-temporary tangible medium". The program may include, for example, a software program or an information processing device program.

When appropriate, the storage medium may be one or more semiconductor-based or other integrated circuits (ICs) (eg, field programmable gate arrays (FPGAs), application-specific ICs (ASICs), etc.), hard disks. Disk drive (HDD), hybrid hard drive (HHD), optical disk, optical disk drive (ODD), magneto-optical disk, magneto-optical drive, floppy diskette, floppy disk drive (FDD), magnetic tape, solid drive (SSD), RAM drive, secure digital card or drive, any other suitable storage medium, or any suitable combination of two or more thereof can be included. The storage medium may be volatile, non-volatile, or a combination of volatile and non-volatile, where appropriate.

Further, the program of the present disclosure may be provided to the server 100 via an arbitrary transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program.

Each embodiment of the present disclosure may also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

The program of the present disclosure may be implemented using, for example, a script language such as JavaScript (registered trademark) or Python, or any programming language such as C language, Go language, Swift, Koltin, or Java (registered trademark). ..

100 Server 101 Control unit 102 Communication unit 105 Storage unit 10 EPC
110 MME
120 S-GW
130 P-GW
200 Base station 300 Communication device 310 Control unit 320 Communication unit 350 Storage unit 400 Network 500 Communication system

Claims (11)

A communication unit that communicates via a network with a communication device that operates in a power-saving state that receives data intermittently.
When data is received from the communication device that did not receive a response to the transmitted data using the communication path between the own device and the communication device set by transmission by the communication device, the communication device is reached. A control unit that sends predetermined data and
Equipped with
As the predetermined data, the control unit gives an instruction regarding resetting the communication path between the own device and the communication device set by transmission by the communication device that did not receive a response to the transmitted data. An information processing device that sends data to a communication device . The control unit has received data indicating that the communication path has been reset, and after the first predetermined period has elapsed, the data has been transmitted to the communication device and the response from the communication device has not been received. Retransmitted to the communication device,
The information processing apparatus according to claim 1 . The control unit receives new data that has not been transmitted and requests a response from the communication device after a second predetermined period has elapsed after receiving the data indicating that the communication path has been reset. , Send to the communication device,
The information processing apparatus according to claim 1 . The control unit transmits an instruction for restarting the communication device to the communication device as an instruction for resetting the communication path.
The information processing apparatus according to any one of claims 1 to 3 . When it is determined that the control unit has not received the response to the transmitted data because it has received the failure information indicating that the communication path has not been established between the communication device and the own device. The predetermined data is transmitted to the communication device in response to receiving the data transmitted from the communication device using the communication path between the own device and the communication device set at the time of transmission by the communication device. do,
The information processing apparatus according to any one of claims 1 to 4 . When the period elapsed after receiving the latest data from the communication device becomes the third predetermined period, the control unit transmits data requesting a response from the communication device to the communication device.
The information processing apparatus according to any one of claims 1 to 5 . For information processing equipment
A step of communicating via a network with a communication device that operates in a power-saving state that receives data intermittently,
When data is received from the communication device that has not received a response to the transmitted data using the communication path between the own device and the communication device set by transmission by the communication device, the communication device is used . And the step of sending the specified data to
To execute,
As the predetermined data, an instruction regarding resetting the communication path between the own device and the communication device set by transmission by the communication device that did not receive a response to the transmitted data is transmitted to the communication device. A control method for information processing equipment. For information processing equipment
A function to communicate via a network with a communication device that operates in a power-saving state that receives data intermittently,
When data is received from the communication device that did not receive a response to the transmitted data using the communication path between the own device and the communication device set by transmission by the communication device, the communication device is reached. A function to send predetermined data and
Realized,
As the predetermined data, an instruction regarding resetting the communication path between the own device and the communication device set by transmission by the communication device that did not receive a response to the transmitted data is transmitted to the communication device. A control program for information processing equipment. A communication system including a communication device that operates in a power-saving state that receives data intermittently and an information processing device that communicates with the communication device via a network.
The information processing device is
When data is received from the communication device that has not received a response to the transmitted data using the communication path between the own device and the communication device set by transmission by the communication device, the communication device is used. Equipped with a first control unit that transmits predetermined data to
The first control unit gives an instruction regarding resetting the communication path between the own device and the communication device set by transmission by the communication device that did not receive a response to the transmitted data as the predetermined data. , Send to the communication device,
The communication device is
A second control unit that executes a predetermined process according to the reception of the predetermined data is provided.
Communications system. The communication device in the communication system according to claim 9 .
The second control unit receives an instruction to restart the own device as the predetermined data, and executes the restart of the own device.
Communication device. When the own device is restarted, the second control unit executes the attachment process to the network.
The communication device according to claim 10 .

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