JP5914616B1 - Network system, firmware update method, station side termination device, and subscriber side termination device - Google Patents

Abstract

A network system is provided that does not interrupt service when updating firmware of a terminal device on a subscriber side. A station-side terminal device 10 transmits new setting information and updated firmware generated based on setting information of firmware operating in a subscriber-side terminal device 30 to the subscriber-side terminal device 30, and the subscriber-side terminal device 30 The communication information of the downlink communication from when the update start notification is received from the termination device 30 to when the update end notification is received is stored in the station side buffer. The subscriber-side terminal device 30 writes the new setting information and the updated firmware in the second storage unit, switches to the updated firmware, and notifies the station-side terminal device 10 and the home gateway 40 of the update start and update end. The home gateway 40 stores the communication information of the uplink communication from the time when the notification of the firmware update start is received from the subscriber-side terminal device 30 to the time when the notification of the update end is received in the subscriber-side buffer. [Selection] Figure 1

Description

  The present invention relates to a network system, a firmware update method, a station-side termination device, and a subscriber-side termination device that can be applied to a network that provides optical communication services, for example.

  One of the network systems is a PON (Passive Optical Network) system that economically provides optical communication services to large-scale subscribers. The PON system is configured by installing a station-side termination device on the telecommunications carrier side, a subscriber-side termination device on the subscriber's home side, and managing communication of a plurality of subscriber-side termination devices with the station-side termination device. . The subscriber-side terminal device needs to be kept up-to-date by updating the firmware to reflect the correction of the vulnerability and the addition of a new function. In the following description, the station-side terminal device may be referred to as OLT (Optical Line Terminal), and the subscriber-side terminal device may be referred to as ONU (Optical Network Unit).

  When updating the firmware, the new firmware is written in the storage area in which the existing firmware in the ONU was operating. Therefore, the firmware cannot be updated while operating the firmware. Therefore, communication via the corresponding ONU is not possible between updating the firmware and establishing connection again after the update (ONU restart). As a result, a time for service interruption occurs.

  To restart the ONU after updating the firmware, OAM registration for OLT, establishment of a link after measuring the signal propagation time between the OLT and ONU, and OAM (Operation Administration for network maintenance and management) and maintenance), it is necessary to establish the OAM link through the exchange of frames and further exchange the authentication / encryption key to share the ONU information necessary for establishing the connection.

  For example, Patent Document 1 discloses a method of sharing ONU information between OLTs for the purpose of shortening a service interruption time.

JP 2014-121038 A

  However, the technique disclosed in Patent Document 1 is provided with a redundant optical subscriber unit (OSU: Optical Subscriber Unit) in the station-side terminal device, and aims to avoid communication interruption that occurs when the OSU firmware is updated. Is. Therefore, this technique cannot cope with the case where the firmware of the subscriber-side terminal device is updated.

  Up to now, there has been no disclosure of a technology that does not cause a communication interruption that occurs at the time of updating the firmware of the subscriber-side terminating device. Therefore, in order to update the firmware of the subscriber-side terminating device, it is necessary to stop the operating firmware, update the firmware, and then restart the subscriber-side terminating device. In the meantime, communication between the station-side terminal device and the subscriber-side terminal device is interrupted, causing a problem that the service is interrupted.

  The present invention has been made in view of this problem, and a network system, a firmware update method, a station-side terminal device, and a subscriber-side terminal device that do not interrupt service when the firmware of a subscriber-side terminal device is updated. An object is to provide an apparatus.

  The network system of the present invention is a network system including a station-side terminal device, a subscriber-side terminal device, and a home gateway, and the station-side terminal device sets firmware that is operating in the subscriber-side terminal device. Receiving the information and updating the firmware to update the new setting information of the updated firmware based on the setting information, and transmitting the updated firmware and the new setting information to the subscriber-side terminal device Update information transmitting unit, and a station-side buffer control unit that accumulates in the station-side buffer communication information for downlink communication from when the update start notification is received to when the update end notification is received from the subscriber-side terminal device The subscriber-side terminal device includes a first storage unit that stores the firmware, and a second storage unit that stores the updated firmware. A storage unit; a reception unit that receives the new setting information and the update firmware and stores the new setting information and the update firmware in an auxiliary storage unit; and an update unit that writes the update firmware stored in the auxiliary storage unit to the second storage unit; A restoration unit that applies the update setting information reflecting the new setting information to the update firmware written in the second storage unit, and the update start notification after the update firmware is written in the second storage unit A notification unit that transmits the update completion notification to the station-side terminal device and the home gateway after applying the update setting information to the update firmware, and the home gateway includes the subscriber-side terminal device. The communication information of the uplink communication from when the update start notification is received until the update end notification is received is stored in the subscriber side buffer It comprises a subscriber-side buffer controller.

  The firmware update method of the present invention is a firmware update method performed by a network system including a station-side termination device, a subscriber-side termination device, and a home gateway, and the station-side termination device includes the subscriber-side termination device. New setting information of updated firmware for receiving the setting information of the firmware operating in the device and updating the firmware is generated based on the setting information, and the updated firmware, the new setting information, and The communication information of the downlink communication from the reception of the update start notification to the reception of the update end notification from the subscriber-side termination device is stored in a station-side buffer, and the subscriber-side termination device is The new setting information and the update firmware are received and stored in an auxiliary storage unit, and the update firmware stored in the auxiliary storage unit is stored. Is written in the second storage unit, the update setting information reflecting the new setting information is applied to the update firmware written in the second storage unit, and the update firmware is written in the second storage unit The update start notification is transmitted to the station side terminal device and the home gateway after the update start notification is applied to the update firmware and the home gateway is transmitted from the subscriber side terminal device. Uplink communication information from when the update start notification is received to when the update end notification is received is stored in the subscriber side buffer.

Also, the station-side terminal device of the present invention is configured to receive the setting information of the firmware that is operating in the subscriber-side terminal device and generate new setting information of updated firmware that updates the firmware based on the setting information An information generation unit, an update information transmission unit that transmits the updated firmware and the new setting information to the subscriber-side termination device, and an update end notification after receiving an update start notification from the subscriber-side termination device A station-side buffer control unit that accumulates communication information of downlink communication until the reception is received in the station-side buffer, and the subscriber-side termination device when there is no response from the subscriber-side termination device for a predetermined time A link disconnection determination unit that determines that the connection with the device is disconnected and does not perform the determination while the firmware is being updated .

In addition, the subscriber-side terminal device of the present invention includes a first storage unit that stores firmware, a second storage unit that stores update firmware of the firmware, setting information of the firmware in operation, and the update firmware A receiving unit that receives the new setting information and the updated firmware and stores the updated firmware in the auxiliary storage unit, an update unit that writes the updated firmware stored in the auxiliary storage unit to the second storage unit, and A restoration unit that applies the updated setting information reflecting the new setting information to the updated firmware written in the second storage unit, and an update start notification after the updated firmware is written in the second storage unit. the update end notification after applying the updated setting information to the firmware, and a notification unit that transmits to the station side terminating device and the home gateway The setting information used by the operating firmware stored in the first storage unit is read out and stored in the auxiliary storage unit, and maintenance information and automatic setting parameters corresponding to the firmware are stored in the station-side termination. A setting information saving unit to be transmitted to the apparatus .

  According to the present invention, the service is not interrupted when the firmware of the subscriber-side terminating device constituting the network system is updated.

It is a figure which shows the structural example of the network system 1 of this Embodiment. 3 is a diagram illustrating a functional configuration example of a station-side terminal device 10; FIG. 3 is a diagram illustrating an example of a functional configuration of a subscriber-side terminal device 30. FIG. 3 is a diagram illustrating an example of a functional configuration of a home gateway 40. FIG. 2 is a diagram illustrating an operation sequence of the network system 1. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Network system configuration]
This embodiment will be described by taking a PON system as an example of a network system. FIG. 1 shows a functional configuration example of a network system 1 using a PON system. PON is an abbreviation for “Passive Optical Network” which is one of access network forms.

  The network system 1 includes a station-side termination device 10, an optical splitter 20, a subscriber-side termination device 30, and a home gateway 40. Inside the station-side termination device 10 is included a media converter called an optical subscriber termination board (OSU) that mutually converts an optical signal and an electrical signal. In the following description, the term “station-side terminal device 10” including the optical subscriber terminal board is referred to.

  The optical signal propagated through one optical fiber output from the station-side terminal device 10 is branched into a plurality (up to 32 branches) by the optical splitter 20 which is a low-cost passive element that does not perform optical-electrical conversion. Then, it is input to the subscriber-side terminal device 30. In FIG. 1, only one subscriber-side terminal device 30 is shown, and other plurality of subscriber-side terminal devices are not shown. In addition, since the present embodiment can be implemented regardless of the presence or absence of the optical splitter 20, the optical splitter 20 is indicated by a broken line. The station-side terminal device 10 and the subscriber-side terminal device 30 are connected by an optical fiber.

  The subscriber-side terminal device 30 converts the optical signal input from the station-side terminal device 10 into an electric signal, and inputs it to the user's personal computer (hereinafter referred to as a PC) 50 via the home gateway 40, and the PC 50 The electric signal input from the home gateway 40 through the home gateway 40 is converted into an optical signal and input to the station-side terminal device 10.

  Next, the configuration of each of the station-side terminal device 10, the subscriber-side terminal device 30, and the home gateway 40 will be described. It should be noted that the functional configuration of each device shows only the portions necessary for the description of the present embodiment, and the description of other general functional configurations is omitted.

[Configuration of station side terminal equipment and functions of each part]
FIG. 2 shows an example of a functional configuration of the station-side terminal device 10. The station-side terminating device 10 includes an OLT-IF unit 11, a station-side buffer 12, and a control unit 13. The station-side terminal device 10 is realized by a predetermined program being read into a computer composed of, for example, a ROM, a RAM, and a CPU, and the CPU executing the program. The same applies to other devices described below.

  The OLT-IF unit 11 connects the control unit 13 and the subscriber-side terminal device 30 so as to allow bidirectional communication. The station-side buffer 12 accumulates communication information for downlink communication from the time when the update start notification for notifying that the firmware update has been started is received from the subscriber-side terminal device 30 until the time when the update end notification is received. Downlink communication is communication from the station-side terminal device 10 toward the PC 50.

The control unit 13 controls the operation of the station side terminal device 10. The control unit 13 further includes a setting information generation unit 130, an update information transmission unit 131, a link break determination unit 132, a gate transmission unit 133, and a station-side buffer control unit 134.

  The setting information generation unit 130 receives the setting information of the firmware that is operating in the subscriber-side terminal device 30 and generates new setting information of the updated firmware that updates the firmware based on the setting information of the operating firmware. Here, the update firmware is firmware that updates (updates) the firmware operating in the subscriber-side terminal device 30. The setting information is information including an identifier for identifying the subscriber-side terminating device 30, an encryption key, maintenance information for the subscriber-side terminating device 30, and automatic setting parameters for the subscriber-side terminating device 30. is there.

  The encryption key included in the setting information is not transmitted to the outside from the subscriber end device 30 due to security. The setting information transmitted from the subscriber-side terminal device 30 to the station-side terminal device 10 is a part of setting information that may cause a difference from the setting information of the operating firmware.

  The new setting information of the updated firmware is the maintenance information and automatic setting parameters of the subscriber-side terminal device 30 that change depending on the firmware, and is generated based on the received setting information of the operating firmware. Here, generating based on means that new setting information is generated by determining the necessity of parameter change based on the received setting information. The new setting information is obtained by changing part or all of maintenance information and automatic setting parameters of the setting information of the operating firmware.

  The maintenance information is information such as whether or not the loopback function is supported and whether or not the extended OAMPDU is supported. The automatic setting parameters are information such as the physical speed upper limit value and the queue length (up / down).

  The update information transmitting unit 131 transmits the updated firmware and the new setting information generated by the setting information generating unit 130 to the subscriber-side terminating device 30.

  The link disconnection determination unit 132 determines that the station-side terminal device 10 and the subscriber-side terminal device 30 are not connected when there is no response from the subscriber-side terminal device 30 for a predetermined time. The loss of connection may be referred to as link disconnection. The link disconnection determination unit 132 does not work while the firmware of the subscriber-side terminal device 30 is being updated. That is, during the firmware update, the link disconnection determination unit 132 does not determine that the station-side terminal device 10 and the subscriber-side terminal device 30 are not connected.

  The Gate transmission unit 133 transmits to the subscriber-side terminal device 30 a Gate signal that periodically notifies the time and the amount of information that the station-side terminal device 10 can communicate with the subscriber-side terminal device 30. The term “periodic” refers to an interval of several microseconds, for example. The Gate signal is exchanged by unicast communication using an identifier uniquely assigned to a logical link (LLID: Logical Link Identification), and notifies the amount of data that can be transmitted by the corresponding subscriber-side terminal device and the transmission possible time.

  The station-side buffer control unit 134 accumulates in the station-side buffer 12 communication information of downlink communication from when the firmware update start notification is received from the subscriber-side terminal device 30 to when the update end notification is received.

[Configuration of subscriber-side terminal equipment and functions of each part]
FIG. 3 shows a functional configuration example of the subscriber-side terminal device 30. The subscriber-side terminal device 30 includes an OLT-IF unit 31, a first storage unit 32, a second storage unit 33, an auxiliary storage unit 34, an HGW-side IF unit 35, and a control unit 36. It comprises.

  The OLT side-IF unit 31 connects the control unit 36 and the station-side terminal device 10 so as to allow bidirectional communication. The 1st memory | storage part 32 is RAM which memorize | stores the firmware for the subscriber side terminal device 30 to operate | move, and is a work area where firmware operates. The second storage unit 33 is a RAM having a storage area different from that of the first storage unit 32, and is a work area in which updated firmware is updated.

  The auxiliary storage unit 34 stores updated firmware and new setting information received from the station-side terminal device 10. The auxiliary storage unit 34 is configured by, for example, a rewritable nonvolatile memory (Flash Read Only Memory). The HGW side-IF unit 35 connects the control unit 36 and the home gateway 40 so as to allow bidirectional communication.

  The control unit 36 controls the operation of the subscriber end device 30. The control unit 36 further includes a setting information saving unit 360, a receiving unit 361, an updating unit 362, a restoring unit 363, and a notification unit 364.

  When the subscriber-side terminal device 30 receives a firmware update request from the station-side terminal device 10, the setting information saving unit 360 uses the setting information used by the operating firmware stored in the first storage unit 32. Is read out and stored in the auxiliary storage unit 34. Here, all the setting information including the encryption key is saved in the auxiliary storage unit 34.

  The receiving unit 361 receives the updated firmware and the new setting information transmitted from the station side terminal device 10 and stores them in the auxiliary storage unit 34. Note that the receiving unit 361 may receive a firmware update request from the station-side terminal device 10 and trigger the operation start of the setting information saving unit 360.

  The update unit 362 reads the update firmware once stored in the auxiliary storage unit 34 and writes it in the second storage unit 33. The restoration unit 363 applies the update setting information reflecting the new setting information to the update firmware written in the second storage unit 33. Here, “to reflect” is to overwrite the setting information of the operating firmware saved by the setting information saving unit 360 with the new setting information. In addition, the application means that the setting information overwritten with the new setting information is combined with the necessary encryption key and identifier to correspond to the updated firmware.

  The notification unit 364 transmits the generated update start notification and update end notification to the station end device 10 and the home gateway 40. The update start notification is generated after the update unit 362 writes the update firmware to the second storage unit 33. The update end notification is generated after the restoration unit 363 applies the update setting information reflecting the new setting information to the update firmware.

[Home gateway configuration and functions of each part]
FIG. 4 shows a functional configuration example of the home gateway 40. The home gateway 40 includes an ONU side-IF unit 41, a subscriber side buffer 42, a terminal side-IF unit 43, and a control unit 44.

  The ONU side-IF unit 41 connects the control unit 44 and the subscriber-side terminal device 30 so as to allow bidirectional communication. The subscriber side buffer 42 accumulates communication information of uplink communication from the start to the end of the firmware update of the subscriber side termination device 30. Uplink communication is communication from the user 50 connected to the home gateway 40, for example, from the PC 50 toward the station-side terminal device 10. The terminal-side IF unit 43 connects the control unit 44 and the home gateway 40 so as to allow bidirectional communication.

  The control unit 44 controls the operation of the home gateway 40. In FIG. 4, notation of a general functional component for controlling the operation of the home gateway 40 is omitted, and only the subscriber-side buffer controller 440 is shown. The subscriber-side buffer control unit 440 accumulates in the subscriber-side buffer 42 uplink communication from when the firmware update start notification is received from the subscriber-side terminal device 30 until the update end notification is received.

[Operation of network system]
The operation will be described with reference to functional configuration examples (FIGS. 2, 3, and 4) of each device and an operation sequence of the network system 1 shown in FIG.

  The station-side terminal device 10 requests the subscriber-side terminal device 30 to update the firmware (step S1). Receiving the firmware update request, the setting information saving unit 360 of the subscriber-side terminating device 30 reads the setting information of the operating firmware stored in the first storage unit 32 and saves it in the auxiliary storage unit 34 ( Step S3).

  Then, the setting information saving unit 360 transmits setting information that may cause a difference to the station-side terminal device 10 (step S4). The setting information that may cause a difference is maintenance information corresponding to firmware and parameters for automatic setting.

  When the setting information is received from the subscriber-side terminating device 30, the update information transmitting unit 131 of the station-side terminating device 10 determines the necessity of changing the setting information, and automatically updates the maintenance information of the setting information corresponding to the update firmware. New setting information, which is a setting parameter, is generated and transmitted to the subscriber-side terminal device 30 (step S5). The update information transmission unit 131 continues to transmit the update firmware (new FW) to the subscriber-side terminal device 30 (step S6).

  The receiving unit 361 of the subscriber-side terminal device 30 stores the received new setting information and updated firmware in the auxiliary storage unit 34 (steps S7 and S8). Next, the update unit 362 of the subscriber-side terminal device 30 reads the update firmware stored in the auxiliary storage unit 34 (step S9) and writes it in the second storage unit 33 (step S10).

  Up to this point, since the subscriber-side terminal device 30 operates with the firmware stored in the first storage unit 32, the service between the station-side terminal device 10 and the home gateway 40 is not interrupted. In addition, although the example which writes update firmware in the 2nd memory | storage part 33 was demonstrated, the work area may be the 2nd memory | storage part 33. In that case, the update unit 362 writes the updated firmware in the first storage unit 32. That is, the destination to which the update firmware is written is switched alternately between the second storage unit 33 and the first storage unit 32 every time the update firmware is updated.

  When writing of the updated firmware by the updating unit 362 is completed, the notification unit 364 of the subscriber-side terminal device 30 transmits a firmware update start notification to the station-side terminal device 10 and the home gateway 40 (steps S11 and S12). The subscriber-side terminal device 30 after transmitting the update start notification stops its operation. Communication information between the station-side terminal device 10 and the PC 50 after the operation is stopped is stored in the station-side terminal device 10 and the home gateway 40. The range of operation steps in which the subscriber-side terminating device 30 stops operating and communication information is accumulated is shown in FIG.

  The station-side buffer control unit 134 of the station-side terminal device 10 that has received the firmware update start notification accumulates communication information for downlink communication in the station-side buffer 12 (step S13). The subscriber-side buffer control unit 440 of the home gateway 40 that has received the notification of the start of firmware update accumulates communication information for uplink communication in the subscriber-side buffer 42 (step S14).

  The restoration unit 363 of the subscriber-side terminal device 30 reads the new setting information written in the auxiliary storage unit 34 in step S7 (step S15), and the setting information of the operating firmware that saved the new setting information in step S3 The update setting information is applied to the update firmware in combination with the necessary encryption key and identifier (step S16).

  When the update setting information is applied to the update firmware, the operation with the update firmware becomes possible. Until the subscriber-side terminal device 30 can operate again (steps S11 to S16), the Gate signal output from the station-side terminal device 10 cannot be received. In FIG. 5, the notation of the situation where the Gate signal cannot be received is omitted.

  While the Gate signal cannot be received, the time of the subscriber-side terminal device 30 and the station-side terminal device 10 is not synchronized, but the subscriber-side terminal device 30 is activated by the Gate signal after the operation with the updated firmware is enabled. And the time of the station-side terminal device 10 are synchronized (steps S17 and S18). When the times are synchronized, the subscriber-side terminal device 30 starts to operate with the updated firmware.

  The notification unit 364 of the subscriber-side terminal device 30 that has resumed operation transmits an update end notification to the station-side terminal device 10 and the home gateway 40 (steps S19 and S20). The station-side terminating device 10 that has received the update end notification transmits the downlink communication information stored in the station-side buffer 12 to the subscriber-side terminating device 30 (step S21). Further, the home gateway 40 transmits the uplink communication information stored in the subscriber side buffer 42 to the subscriber side termination device 30 (step S22).

  As described above, according to the present embodiment, the update firmware work area is separately prepared in the subscriber-side terminal device 30, so that the update firmware can be written while the firmware is operating. Further, information on the subscriber-side termination device (above ONU information) necessary for communication between the station-side termination device 10 and the subscriber-side termination device 30 is stored in advance in the auxiliary storage unit 34, and the stored information is stored in the auxiliary storage unit 34. Since it is restored and used, the time during which communication is interrupted can be minimized. Further, since the communication information that reaches the subscriber-side terminal device 30 during update of the update firmware is stored in the station-side terminal device 10 and the home gateway 40, the service being updated is not interrupted.

  In other words, in this embodiment, the updated firmware can be written to the subscriber-side terminal device 30 while the firmware is operating, so that the updated firmware can be updated without being affected by the software size of the updated firmware. Has the effect of making. Further, according to the present embodiment, the link disconnection determination unit 132 of the station-side terminal device 10 does not determine that the connection with the subscriber-side terminal device 30 has been disconnected during the update. The procedure for reconnecting is made unnecessary, and reconnection can be enabled only by the process of performing time synchronization.

  Generally, when the communication delay between terminals exceeds 150 msec, the communication quality cannot be maintained in the case of a high quality telephone service or the like. According to the present embodiment, the time required for the time synchronization process (step S18) is completed in nanosecond order. Therefore, the firmware of the subscriber-side terminal device 30 can be updated without interrupting the service by storing (buffering) the communication information by the station-side terminal device 10 and the home gateway 40.

  As described above, according to the network system 1 of the present embodiment, the updating of firmware that has been interrupted for a long time including the restart of the subscriber-side terminal device 30 is not interrupted. Can be done. Also, since the service provision is not interrupted, the firmware can be updated without worrying about the communication status.

  In the present embodiment, the station-side terminating device 10 has been described as an example including one optical subscriber termination board (OSU). However, the station-side terminating device 10 has a configuration including a plurality of optical subscriber termination boards. May be. In the present embodiment, the optical splitter 20 may or may not be provided. Further, although an example in which the PC 50 is connected to the home gateway 40 has been shown, the PC 50 may be a digital television or the like other than the PC.

  Although the description of the present embodiment has been made by taking the PON system as an example, the technical idea shown in the present embodiment can be applied to a network other than the PON system. As described above, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist thereof.

1: Network system 10: Station-side terminator 20: Optical splitter 30: Subscriber-side terminator 40: Home gateway 50: PC

Claims (4)

A network system comprising a station-side terminal device, a subscriber-side terminal device, and a home gateway,
The station side termination device is:
A setting information generating unit for generating new setting information of updated firmware for receiving the setting information of the firmware in operation at the subscriber-side terminal device and updating the firmware; and
An update information transmission unit for transmitting the update firmware and the new setting information to the subscriber-side terminal device;
A station-side buffer control unit that accumulates communication information of downlink communication between receiving the update start notification and receiving the update end notification from the subscriber-side terminal device in the station-side buffer;
The subscriber-side termination device is:
A first storage unit for storing the firmware;
A second storage unit for storing the updated firmware;
A receiving unit for receiving the new setting information and the updated firmware and storing them in an auxiliary storage unit;
An update unit for writing the update firmware stored in the auxiliary storage unit into the second storage unit;
A restoration unit that applies update setting information reflecting the new setting information to the update firmware written in the second storage unit;
After the update firmware is written in the second storage unit, the update start notification is transmitted, and after the update setting information is applied to the update firmware, the update end notification is transmitted to the station end device and the home gateway. A notification unit;
The home gateway is a subscriber-side buffer control that accumulates in the subscriber-side buffer communication information for uplink communication from when the update start notification is received from the subscriber-side termination device to when the update end notification is received. A network system. A firmware update method performed by a network system including a station-side terminal device, a subscriber-side terminal device, and a home gateway,
The station-side terminal device receives the setting information of the firmware that is operating in the subscriber-side terminal device and generates new setting information of updated firmware that updates the firmware based on the setting information, and the subscriber The update firmware and the new setting information are transmitted to the terminal device on the side, and the communication information of the downlink communication from the reception of the update start notification to the reception of the update end notification is received from the subscriber side terminal device Accumulate in the buffer,
The subscriber-side terminating device receives the new setting information and the updated firmware and stores them in an auxiliary storage unit, writes the updated firmware stored in the auxiliary storage unit into a second storage unit, and The update setting information reflecting the new setting information is applied to the update firmware written in the second storage unit, and the update start notification is sent to the update firmware after the update firmware is written in the second storage unit. After applying the update setting information, the update end notification is transmitted to the station-side terminal device and the home gateway,
The home gateway stores, in a subscriber-side buffer, communication information of uplink communication from when the update start notification is received from the subscriber-side terminal device to when the update end notification is received. Firmware update method. A setting information generation unit that generates new setting information of updated firmware that receives the setting information of the firmware that is operating in the subscriber-side terminal device and updates the firmware, based on the setting information;
An update information transmission unit for transmitting the update firmware and the new setting information to the subscriber-side terminal device;
From the subscriber-side terminal device, a station-side buffer control unit that accumulates communication information of downlink communication between receiving an update start notification and receiving an update end notification in a station-side buffer ;
When there is no response from the subscriber-side terminal device for a predetermined time, it is determined that the connection with the subscriber-side terminal device is disconnected, and the link disconnection determination is not performed during the firmware update. station side terminating device, characterized by comprising a part. A first storage unit for storing firmware;
A second storage unit for storing updated firmware of the firmware;
A receiving unit that receives the setting information of the firmware in operation, the new setting information of the updated firmware, and the updated firmware, and stores the updated firmware in an auxiliary storage unit;
An update unit for writing the update firmware stored in the auxiliary storage unit into the second storage unit;
A restoration unit that applies update setting information reflecting the new setting information to the update firmware written in the second storage unit;
An update start notification after writing the update firmware to the second storage unit, an update end notification after applying the update setting information to the update firmware, a notification unit that transmits to the station-side terminal device and the home gateway ;
The setting information used by the operating firmware stored in the first storage unit is read out and stored in the auxiliary storage unit, and maintenance information and automatic setting parameters corresponding to the firmware are stored in the station-side termination. A subscriber-side terminating device comprising: a setting information saving unit for transmitting to the device.

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