CN108886555B - Communication adapter device, data communication system, and data communication method - Google Patents
Communication adapter device, data communication system, and data communication method Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims description 15
- 230000005236 sound signal Effects 0.000 claims abstract description 50
- 238000012544 monitoring process Methods 0.000 claims abstract description 43
- 238000012806 monitoring device Methods 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 11
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/1053—IP private branch exchange [PBX] functionality entities or arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
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Abstract
The invention provides a communication adapter device which is connected with a monitoring device of a circuit switching mode and can perform communication through other units even if data communication fails. The disclosed device is provided with: a packet processing section that converts an analog sound signal from the monitoring apparatus into packets and converts the packets from the monitoring center into an analog sound signal; a PB signal recognition unit that recognizes a PB signal indicating the end of communication included in the analog audio signal; a control unit that determines that communication is successful when the PB signal recognition unit recognizes the PB signal, and waits for a predetermined fixed time when the line is disconnected although the PB signal is not recognized; and a message transmitting unit that transmits a message to the monitoring center to notify the monitoring apparatus of a communication failure with the monitoring center, when the calling party or the called party is not present even after the control unit waits for a predetermined time.
Description
Technical Field
The present invention relates to a communication adapter device connected to a circuit-switched monitoring device and configured to transmit and receive data to and from a monitoring center via a packet-switched network, and a data communication system and a data communication method using the communication adapter device.
Background
Conventionally, monitoring data of a monitoring target such as an elevator is transmitted to a monitoring center installed at a remote location via a communication line, or voice communication is performed between the monitoring target and the monitoring center.
In this case, the monitoring device to be monitored and the remote monitoring unit of the monitoring center are connected in a line-switching manner via a modem via a fixed telephone line or a PHS (Personal handyphone System) line, and analog modem communication for transmitting and receiving an analog audio signal between the monitoring device and the remote monitoring unit may be performed. The circuit switching method is a method in which a physical or virtual one-to-one transmission channel is set between the monitoring apparatus and the remote monitoring unit between the start of communication and the end of communication, and data is transmitted and received while occupying the line.
In recent years, instead of the circuit switching method, a packet switching method has become mainstream in which data is divided into small units called packets and each packet is transmitted and received independently using a packet switching network as a mobile phone circuit such as lte (long Term evolution). In the packet switching method, when a packet is not normally transmitted, the packet is retransmitted by retry.
Here, a communication adapter device is proposed, which includes: a voice packet conversion processing unit configured to be capable of transmitting and receiving an analog voice signal to and from the monitored unit and to perform interconversion between the packet and the analog voice signal transmitted and received to and from the monitored unit; and a wireless communication module configured to be capable of performing wireless communication with a mobile communication network having a packet switching network and to perform interconversion between a wireless transmission signal transmitted and received to and from the mobile communication network and a packet processed by the packet conversion processing unit (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2011-249860
Disclosure of Invention
Problems to be solved by the invention
However, the following problems are present in the conventional art.
That is, in analog modem communication, a carrier is always transmitted during continuous communication, and the modem IC determines that the line is disconnected when the carrier is interrupted.
Therefore, when the communication adapter device described in patent document 1 is applied to a circuit switching monitoring device, there are problems as follows: when a packet is retransmitted without being normally transmitted, or when the packet arrives with a delay due to congestion in the packet switching network, the carrier is interrupted, and it may be determined that the line is disconnected although the data communication is not completed.
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a communication adapter device which is connected to a monitoring device of a circuit switching method and can perform communication by another unit even if data communication fails.
Means for solving the problems
A communication adapter device according to the present invention is a communication adapter device that is connected to a circuit-switching monitoring device and that transmits and receives data to and from a monitoring center via a packet-switching network, the communication adapter device including: a packet processing section that converts an analog sound signal from the monitoring apparatus into packets and converts the packets from the monitoring center into an analog sound signal; a PB signal recognition unit that recognizes a PB signal indicating the end of communication included in the analog audio signal; a control unit that determines that communication is successful when the PB signal recognition unit recognizes the PB signal, and waits for a predetermined fixed time when the line is disconnected although the PB signal is not recognized; and a message transmitting unit that transmits a message to the monitoring center to notify the monitoring apparatus of a communication failure with the monitoring center, when the calling party or the called party is not present even after the control unit waits for a predetermined time.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the communication adapter device of the present invention, in the communication adapter device which is connected to a monitoring device of a circuit switching system and transmits and receives data to and from a monitoring center via a packet switching network, a packet processing section converts an analog audio signal from the monitoring device into a packet, then, the packet from the monitoring center is converted into an analog audio signal, the PB signal recognition unit recognizes a PB signal indicating the end of communication included in the analog audio signal, and the control unit determines that the communication is successful when the PB signal recognition unit recognizes the PB signal, when the line is disconnected although the PB signal is not recognized, the monitoring device waits for a predetermined fixed time, and when the control unit does not have a caller or a receiver after waiting for the fixed time, the message transmission unit transmits a message to the monitoring center to notify the monitoring device of a communication failure with the monitoring center.
Therefore, it is possible to obtain a communication adapter device which is connected to a monitoring device of a circuit switching system and can perform communication by another unit even if data communication fails.
Drawings
Fig. 1 is a configuration diagram showing a data communication system to which a communication adapter apparatus according to embodiment 1 of the present invention is applied.
Fig. 2 is a block diagram showing the configuration of a communication adapter device according to embodiment 1 of the present invention.
Fig. 3 is a block diagram showing the configuration of a monitoring center according to embodiment 1 of the present invention.
Fig. 4 is a sequence diagram showing a communication flow between the monitoring apparatus and the monitoring center according to embodiment 1 of the present invention.
Fig. 5 is a flowchart showing the operation of the communication adapter device according to embodiment 1 of the present invention.
Detailed Description
Hereinafter, preferred embodiments of the communication adapter device according to the present invention will be described with reference to the drawings, but the same or equivalent parts in the drawings will be described with the same reference numerals.
Embodiment 1.
Fig. 1 is a configuration diagram showing a data communication system to which a communication adapter apparatus according to embodiment 1 of the present invention is applied. In fig. 1, the data communication system is configured such that a monitoring target 10 and a monitoring center 20 are connected to each other via a packet switching network 30.
Here, the monitoring target 10 includes: a microphone 2 and a speaker 3 (e.g., an intercom) provided in the car of the elevator 1; a monitoring device 4 connected to the elevator 1; a modem 5 for modulating the audio signal from the monitoring device 4 and outputting the modulated audio signal as a modem signal; and a communication adapter means 6 connected to the modem 5.
The monitoring device 4 transmits the monitoring data of the elevator 1 to the monitoring center 20, or performs voice communication with the monitoring center 20 using the microphone 2 and the speaker 3. The modem 5 and the communication adapter apparatus 6 are connected to each other by using a fixed telephone line 7 as an interface (hereinafter referred to as a fixed telephone line I/F).
The monitoring center 20 is connected to the packet communication network 30 via a dedicated line 8. The monitoring center 20 is provided with an SMS reception unit 24, and the SMS reception unit 24 receives a message based on an SMS (short message service) from the communication adapter apparatus 6 when data communication is not normally completed.
Hereinafter, the functions of the communication adapter apparatus 6 according to embodiment 1 of the present invention will be described. First, the communication adapter apparatus 6 converts an analog audio signal (modem signal) from the fixed telephone line I/F into a digital audio signal without compression, while maintaining 64Kbps, and compresses the analog audio signal into about 32Kbps and converts the digital audio signal into a digital audio signal, packetizes the digital audio signal, and transmits the digital audio signal to the packet communication network 30.
The communication adapter device 6 receives a packet from the packet switching network 30, converts a digital audio signal of about 64Kbps or 32Kbps into an analog audio signal, and transmits the analog audio signal to the fixed telephone line I/F.
At this time, the communication adapter means 6 checks whether or not a pb (push button) signal (DTMF) of a specific mode is included in the analog audio signal from the fixed telephone line I/F or the analog audio signal converted from the packet switching network 30. The PB signal is a signal transmitted when a report from the monitoring apparatus 4 or polling from the monitoring center 20 is normally ended.
In addition, when the communication adapter apparatus 6 detects a PB signal of a specific pattern after the report or polling starts, it is regarded that the report or polling is successful.
On the other hand, when the line is disconnected although the PB signal of the specific mode is not detected after the report or polling is started, the communication adapter apparatus 6 is regarded as a report or polling failure, but waits for a predetermined fixed time because the report or polling is retried as described above.
When there is no caller or receiver related to the report or polling even during the standby for a fixed time, the communication adapter apparatus 6 determines that the retry is completed, and notifies the monitoring center 20 of the report or polling failure by using a message transmitted from a unit different from the packet switched network 30, such as SMS.
This makes it possible to easily distinguish whether the monitoring apparatus 4 cannot respond due to power-off or the like, or whether the communication cannot be smoothly performed although the call can be received. In addition, when the circuit-switched monitoring device 4 is connected to the packet-switched network 30, even when a report or polling failure occurs due to congestion of the packet-switched network 30, the failure can be notified to the monitoring center 20, so that the cost can be reduced and the monitoring quality can be improved.
Fig. 2 is a block diagram showing the configuration of a communication adapter device according to embodiment 1 of the present invention. Fig. 3 is a block diagram showing the configuration of a monitoring center according to embodiment 1 of the present invention.
In fig. 2, the communication adapter apparatus 6 includes a telephone line processing section 11, an a/D conversion section 12, a packet processing section 13, a wireless processing section 14, a PB signal recognition section 15, an SMS transmission section 16, and a control section 17. Here, the control unit 17 is a cpu (central Processing unit).
When detecting an operation related to a calling party (dialing from the monitoring apparatus 4) such as a call start by the microphone 2 or transmission of monitoring data from the monitoring apparatus 4, the telephone line processing unit 11 calls the monitoring center 20 and transmits a ring (call signal) when receiving a call from the monitoring center 20.
The a/D conversion unit 12 converts an analog audio signal from the fixed telephone line I/F into a digital audio signal, and converts a digital audio signal obtained by arranging packets from the packet switching network 30 in the order of packets into an analog audio signal. In the case of compressing the analog audio signal or in the case of restoring the digital audio signal, the a/D converter 12 compresses or decodes the analog audio signal.
The packet processing unit 13 divides the digital audio signal from the a/D conversion unit 12 into packets, and arranges the packets from the packet switching network 30 in the order of the packets. The radio processing unit 14 transmits the packet from the packet processing unit 13 to the packet switching network 30 and receives the packet from the packet switching network 30.
The PB signal recognition unit 15 checks whether or not the PB signal of the specific mode is included in the analog audio signal from the fixed telephone line I/F or the analog audio signal obtained by converting the packet from the packet switching network 30.
When the report from the monitoring apparatus 4 or the polling from the monitoring center 20 is not normally completed, the SMS transmission unit 16 transmits a message to the monitoring center 20 by SMS in accordance with an instruction from the control unit 17. The control unit 17 controls the operations of the telephone line processing unit 11, the a/D conversion unit 12, the packet processing unit 13, the radio processing unit 14, the PB signal recognition unit 15, and the SMS transmission unit 16.
In fig. 3, the monitoring center 20 includes a packet processing unit 21, an a/D conversion unit 22, a modem communication unit 23, an SMS reception unit 24, a control unit 25, a modem 26, and a remote monitoring unit 27. Here, the control unit 25 is a CPU.
The packet processing unit 21 arranges packets from the packet switching network 30 in the order of the packets, and divides the digital audio signal from the a/D conversion unit 22 into packets. The a/D conversion unit 22 converts a digital audio signal obtained by arranging packets from the packet switching network 30 in the order of packets into an analog audio signal, and also converts an analog audio signal from the modem communication unit 23 into a digital audio signal.
The modem communication unit 23 transmits the analog audio signal from the a/D conversion unit 22 to the modem 26, and receives a modem signal from the modem 26. In addition, the SMS reception section 24 receives a message from the SMS transmission section 16. The control unit 25 controls operations of the packet processing unit 21, the a/D conversion unit 22, the modem communication unit 23, and the SMS reception unit 24.
The modem 26 demodulates the analog audio signal from the modem communication unit 23 and transmits the demodulated signal to the remote monitoring unit 27, and modulates the signal from the remote monitoring unit 27 and transmits the modulated signal to the modem communication unit 23. The remote monitoring unit 27 receives a signal from the modem 26, and transmits a signal to the modem 26 when polling is performed.
Fig. 4 is a sequence diagram showing a communication flow between the monitoring apparatus and the monitoring center according to embodiment 1 of the present invention. In fig. 4, the upper stage shows a report from the monitoring apparatus 4 to the monitoring center 20, and the lower stage shows polling from the monitoring center 20 to the monitoring apparatus 4.
First, at the time of reporting, for example, the monitoring apparatus 4 dials the number of the monitoring center 20. Next, after the line is connected to the monitoring center 20, modem communication is started. Next, when the monitoring device 4 reports the end of the normal state, it outputs a PB signal, the PB signal recognition unit 15 of the communication adapter device 6 recognizes the PB signal, determines that the communication is successful, and the monitoring device 4 disconnects the line.
On the other hand, at the time of polling, for example, when there is a call from the monitoring center 20, a call-receiving signal is transmitted to the monitoring apparatus 4. Next, after the line is connected to the monitoring apparatus 4, modem communication is started. Next, when the polling is normally finished, the monitoring center 20 outputs a PB signal, the PB signal recognition unit 15 of the communication adapter apparatus 6 recognizes the PB signal, determines that the communication is successful, and the monitoring apparatus 4 disconnects the line.
Hereinafter, the operation of the communication adapter apparatus according to embodiment 1 of the present invention will be described with reference to the flowchart of fig. 5. The operation of fig. 5 is executed when, for example, the telephone line processing unit 11 of the communication adapter apparatus 6 detects a report from the monitoring apparatus 4 or polling from the monitoring center 20.
In fig. 5, first, the communication adapter apparatus 6 determines whether or not the communication is a caller (step S1). Here, when the monitoring apparatus 4 dials a number, the communication adapter apparatus 6 determines that the communication is a call source.
If it is determined at step S1 that the communication is not a caller (i.e., no), the communication adapter apparatus 6 determines whether the communication is a callee (step S2). Here, the communication adapter apparatus 6 determines that the communication is a call recipient when receiving a call recipient signal from the packet switching network 30.
If it is determined in step S2 that the communication is not a called party (i.e., no), the communication adapter apparatus 6 proceeds to step S1 to determine again whether or not the communication is a calling party.
On the other hand, when it is determined at step S2 that the communication is a call recipient (that is, yes), the communication adapter apparatus 6 invalidates the PB flag at the start of communication (step S3).
Next, the communication adapter apparatus 6 performs modem communication between the monitoring apparatus 4 and the monitoring center 20 (step S4). The modem communication here is assumed to be communication of a plurality of packets related to 1 polling, for example.
Next, the communication adapter apparatus 6 determines whether or not the PB signal of the specific mode is recognized by the PB recognition unit 15 (step S5).
If it is determined at step S5 that the PB signal is recognized (i.e., yes), the communication adapter apparatus 6 turns the PB flag on (step S6) and determines whether or not the line is disconnected (step S7).
On the other hand, when it is determined in step S5 that the PB signal is not recognized (i.e., no), the communication adapter apparatus 6 proceeds directly to step S7 to determine whether or not the line is disconnected.
If it is determined in step S7 that the line is not disconnected (i.e., no), the process proceeds to step S4, and modem communication is performed again.
On the other hand, when it is determined in step S7 that the line is disconnected (that is, yes), the communication adapter apparatus 6 determines whether or not the PB flag is valid (step S8).
If it is determined in step S8 that the PB flag is not valid (i.e., no), it is determined that the retry is being performed and the device waits for a fixed time (step S9). Here, the fixed time is assumed to be a time having a margin for the time of performing the retry a plurality of times, and is, for example, on the order of 3 to 5 minutes.
Next, the communication adapter apparatus 6 determines whether or not there is a call recipient during the standby time (step S10).
If it is determined in step S10 that there is a call recipient (i.e., yes), the process proceeds to step S3, where the PB flag is set to invalid, and communication is resumed.
On the other hand, when it is determined that there is no call recipient (that is, no) in step S10, the communication adapter apparatus 6 determines that the retry is completed, transmits a message from the SMS transmission unit 16 to the monitoring center 20 (step S11), and completes the processing of fig. 5.
On the other hand, when it is determined in step S8 that the PB flag is valid (that is, yes), the communication adapter apparatus 6 ends the processing of fig. 5.
On the other hand, when it is determined in step S1 that the communication is a caller (i.e., yes), the communication adapter apparatus 6 sets the PB flag to invalid when starting the communication (step S13).
Next, the communication adapter apparatus 6 performs modem communication between the monitoring apparatus 4 and the monitoring center 20 (step S14). In addition, the modem communication here is assumed to be communication of a plurality of packets related to, for example, 1-time calling.
Next, the communication adapter apparatus 6 determines whether or not the PB signal of the specific mode is recognized by the PB recognition unit 15 (step S15).
If it is determined at step S15 that the PB signal is recognized (i.e., yes), the communication adapter apparatus 6 turns the PB flag on (step S16) and determines whether or not the line is disconnected (step S17).
On the other hand, when it is determined in step S15 that the PB signal is not recognized (i.e., no), the communication adapter apparatus 6 proceeds directly to step S17 to determine whether or not the line is disconnected.
If it is determined in step S17 that the line is not disconnected (i.e., no), the process proceeds to step S14, and modem communication is performed again.
On the other hand, when it is determined in step S17 that the line is disconnected (that is, yes), the communication adapter apparatus 6 determines whether or not the PB flag is valid (step S18).
If it is determined in step S18 that the PB flag is not valid (i.e., no), it is determined that the retry is being performed and the device waits for a fixed time (step S19). Here, the fixed time is assumed to be a time having a margin for the time of performing the retry a plurality of times, and is, for example, on the order of 3 to 5 minutes.
Next, the communication adapter apparatus 6 determines whether or not there is a caller during the standby time (step S20).
If it is determined in step S20 that a caller is present (i.e., yes), the process proceeds to step S13, where the PB flag is set to invalid, and communication is resumed.
On the other hand, when it is determined in step S20 that there is no caller (i.e., no), the communication adapter apparatus 6 determines that the retry is completed, transmits a message from the SMS transmission unit 16 to the monitoring center 20 (step S21), and completes the processing of fig. 5.
As described above, according to embodiment 1, in a communication adapter device which is connected to a monitoring device of a circuit switching system and transmits and receives data to and from a monitoring center via a packet switching network, a packet processing unit converts an analog audio signal from the monitoring device into a packet, then, the packet from the monitoring center is converted into an analog audio signal, the PB signal recognition unit recognizes a PB signal indicating the end of communication included in the analog audio signal, and the control unit determines that the communication is successful when the PB signal recognition unit recognizes the PB signal, when the line is disconnected although the PB signal is not recognized, the monitoring apparatus waits for a predetermined fixed time, and when the control unit does not have a caller or a callee after waiting for the fixed time, the message transmission unit transmits an SMS message to the monitoring center to notify the monitoring apparatus of a communication failure with the monitoring center.
Therefore, a communication adapter device which is connected to a monitoring device of a circuit switching system and can perform communication by another unit (SMS) even if data communication fails can be obtained.
Claims (3)
1. A communication adapter device connected to a monitoring device of a circuit switching system and transmitting and receiving data to and from a monitoring center via a packet switching network,
the communication adapter device includes:
a packet processing section that converts an analog sound signal from the monitoring apparatus into packets and converts the packets from the monitoring center into an analog sound signal;
a PB signal recognition unit that recognizes a PB signal indicating the end of communication included in the analog audio signal;
a control unit that determines that communication is successful when the PB signal recognition unit recognizes the PB signal, and waits for a predetermined fixed time when the line is disconnected although the PB signal is not recognized; and
and a message transmitting unit that transmits a message to the monitoring center to notify the monitoring apparatus of a communication failure with the monitoring center, when the calling party or the called party is not present even after the control unit waits for the fixed time.
2. A data communication system in which, in a data communication system,
the data communication system is constituted by the communication adapter apparatus of claim 1 and the monitoring center.
3. A data communication method executed in a communication adapter device which is connected to a monitoring device of a circuit switching system and transmits and receives data to and from a monitoring center via a packet switching network,
the data communication method has the following steps:
a packet processing step of converting an analog sound signal from the monitoring apparatus into a packet and converting a packet from the monitoring center into an analog sound signal;
a PB signal recognition step of recognizing a PB signal indicating the end of communication included in the analog audio signal;
a standby step of, when the line is disconnected although the PB signal is not recognized, waiting for a predetermined fixed time; and
and a notification step of transmitting a message to the monitoring center to notify the monitoring apparatus of a communication failure with the monitoring center, in a case where the calling party or the called party does not exist even after the standby for the fixed time.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2016/060057 WO2017168550A1 (en) | 2016-03-29 | 2016-03-29 | Communication adapter device, data communication system, and data communication method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108886555A CN108886555A (en) | 2018-11-23 |
| CN108886555B true CN108886555B (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680084155.5A Expired - Fee Related CN108886555B (en) | 2016-03-29 | 2016-03-29 | Communication adapter device, data communication system, and data communication method |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6227161B1 (en) |
| KR (1) | KR102136477B1 (en) |
| CN (1) | CN108886555B (en) |
| DE (1) | DE112016006690T5 (en) |
| WO (1) | WO2017168550A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007070053A (en) * | 2005-09-07 | 2007-03-22 | Toshiba Elevator Co Ltd | Remotely monitoring terminal device |
| CN101416174A (en) * | 2006-04-05 | 2009-04-22 | 摩托罗拉公司 | Session persistence on a wireless network |
| JP2009212730A (en) * | 2008-03-03 | 2009-09-17 | Oriental-Security Co Ltd | Device, program and method for switching telephone network, and security system provided with device for switching telephone network |
| JP2011249860A (en) * | 2010-05-21 | 2011-12-08 | Softbank Mobile Corp | Remote monitoring system and communication adapter device for the system |
| JP2015179930A (en) * | 2014-03-19 | 2015-10-08 | 日本電信電話株式会社 | Traffic monitoring system, program therefor, and traffic monitoring method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08293896A (en) * | 1995-04-20 | 1996-11-05 | Nec Corp | Method and device for notification of completion of data communication in isdn terminal |
| JP2002020049A (en) * | 2000-07-07 | 2002-01-23 | Mitsubishi Electric Building Techno Service Co Ltd | Remote monitoring system for elevator |
-
2016
- 2016-03-29 DE DE112016006690.2T patent/DE112016006690T5/en active Pending
- 2016-03-29 JP JP2016555799A patent/JP6227161B1/en not_active Expired - Fee Related
- 2016-03-29 WO PCT/JP2016/060057 patent/WO2017168550A1/en active Application Filing
- 2016-03-29 CN CN201680084155.5A patent/CN108886555B/en not_active Expired - Fee Related
- 2016-03-29 KR KR1020187030793A patent/KR102136477B1/en active IP Right Grant
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007070053A (en) * | 2005-09-07 | 2007-03-22 | Toshiba Elevator Co Ltd | Remotely monitoring terminal device |
| CN101416174A (en) * | 2006-04-05 | 2009-04-22 | 摩托罗拉公司 | Session persistence on a wireless network |
| JP2009212730A (en) * | 2008-03-03 | 2009-09-17 | Oriental-Security Co Ltd | Device, program and method for switching telephone network, and security system provided with device for switching telephone network |
| JP2011249860A (en) * | 2010-05-21 | 2011-12-08 | Softbank Mobile Corp | Remote monitoring system and communication adapter device for the system |
| JP2015179930A (en) * | 2014-03-19 | 2015-10-08 | 日本電信電話株式会社 | Traffic monitoring system, program therefor, and traffic monitoring method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108886555A (en) | 2018-11-23 |
| KR102136477B1 (en) | 2020-07-21 |
| WO2017168550A1 (en) | 2017-10-05 |
| JPWO2017168550A1 (en) | 2018-04-05 |
| DE112016006690T5 (en) | 2018-12-13 |
| JP6227161B1 (en) | 2017-11-08 |
| KR20180120277A (en) | 2018-11-05 |
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