WO2018232971A1 - 一种物联网终端设备与汇聚单元的时间同步方法及系统 - Google Patents
一种物联网终端设备与汇聚单元的时间同步方法及系统 Download PDFInfo
- Publication number
- WO2018232971A1 WO2018232971A1 PCT/CN2017/098639 CN2017098639W WO2018232971A1 WO 2018232971 A1 WO2018232971 A1 WO 2018232971A1 CN 2017098639 W CN2017098639 W CN 2017098639W WO 2018232971 A1 WO2018232971 A1 WO 2018232971A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- time
- terminal device
- access point
- iot access
- tag
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
Definitions
- the present invention relates to the field of Internet of Things technologies, and in particular, to a time synchronization method and system for an Internet of Things terminal device and a convergence unit.
- the Internet of Things collects any object or process that needs to be monitored and interacted by sensors, radio frequency identification technology, positioning technology, etc., and collects various information required for sound and light, thermoelectricity, mechanics, chemistry, biology, etc., and accesses the network through various terminal devices. To realize the connection between objects and objects, objects and people, to achieve intelligent perception and management of objects or processes.
- the terminal device in the Internet of Things accesses the Internet of Things through the IoT access node, reports the collected data to the aggregation unit, and the aggregation unit analyzes and processes the data generated by the terminal device.
- the number of terminal devices in the Internet of Things is relatively large.
- the aggregation unit usually collects data only from the terminal devices it is interested in. This requires it to analyze small data streams that characterize time, specific types, and other related features, but because of the Internet of Things devices. With an independent time system, when using the feature of characterization time, it is necessary to ensure the reliability of the time data used.
- the embodiment of the invention discloses a time synchronization method and system for an Internet of Things terminal device and a convergence unit, which are used for synchronizing the time between the Internet of Things terminal device and the aggregation unit.
- the first aspect of the present invention discloses a method for time synchronization of an Internet of Things terminal device and a convergence unit, which may include:
- the IoT access point sends a broadcast message within its wireless network coverage, the broadcast message including a first time tag of the IoT access point to send the broadcast message, the IoT access point and the aggregation unit time Synchronize;
- the IoT access point receives a response message of the terminal device to the broadcast message, where the response message includes a terminal device type, the first time label, and a second time label that the terminal device receives the broadcast message. Transmitting, by the terminal device, a third time label of the response message;
- the IoT access point determines whether the terminal device type matches a device type specified by the aggregation unit
- the IoT access point obtains the Internet of Things connection according to the first time tag, the second time tag, the third time tag, and a fourth time tag that receives the response message. a time difference between the ingress point and the terminal device and sent to the terminal device;
- the terminal device performs time synchronization adjustment according to the time difference.
- the response message further includes a time type adopted by the terminal device, and the Internet of Things access point is configured according to the first time label, The second time tag, the third time tag, and the fourth time tag that receives the response message, obtain a time difference between the IoT access point and the terminal device, and send the time difference to the terminal device, including:
- the IoT access point determines whether the type of time used by the IoT access point is consistent with the type of time used by the terminal device;
- the IoT access point obtains the Internet of Things connection according to the first time tag, the second time tag, the third time tag, and a fourth time tag that receives the response message. a time difference between the ingress point and the terminal device and sent to the terminal device;
- the IoT access point converts the first time tag into a fifth time tag corresponding to the time type adopted by the terminal device, and converts the fourth time tag into the terminal device Obtaining, by the fifth time label, the sixth time label, the second time label, and the third time label, the Internet of Things access point and the terminal according to the sixth time label corresponding to the time type The time difference between the devices is sent to the terminal device.
- the method before the IoT access point sends a broadcast message in the coverage of the wireless network, the method further includes:
- the IoT access point invokes a time interface, and uses the time interface to interact with a time server to obtain a time offset between the time server and the time server;
- the IoT access point adjusts the time of the Internet of Things access point according to the time offset to implement time synchronization with the aggregation unit.
- the Internet of Things access point invokes a time interface, and uses the time interface to interact with a time server to obtain a time synchronization signal, and obtains a time synchronization signal with the time server.
- Time offset including:
- the IoT access point invokes a time interface, and uses the time interface to receive a first time synchronization signal transmitted by the time server on the dedicated subcarrier channel, to obtain a first arrival time of the first time synchronization signal;
- the IoT access point receives the second time synchronization signal transmitted by the time server on the dedicated subcarrier channel by using the time interface, and acquires the first time synchronization signal from the second time synchronization signal.
- the IoT access point sends a third time synchronization signal to the time server by using the time interface, and records a second sending time for sending the third time synchronization signal;
- the IoT access point utilizes the time interface to receive the time server in the dedicated a fourth time synchronization signal transmitted on the subcarrier channel, and acquiring a second arrival time of the third time synchronization signal from the fourth time synchronization signal;
- the IoT access point obtains a time offset from the time server according to the first arrival time, the first transmission time, the second transmission time, and the second arrival time.
- the response message further includes terminal device address information, after the IoT access point receives the response message of the terminal device to the broadcast message, Before the IoT access point determines whether the terminal device type matches the device type specified by the aggregation unit, the method further includes:
- the IoT access point Determining, by the IoT access point, whether the terminal device address information matches the location information specified by the aggregation unit, and if the matching, the IoT access point performs determining whether the terminal device type is related to the aggregation unit The steps for matching the specified device type.
- the second aspect of the present invention discloses a time synchronization system for an Internet of Things terminal device and a convergence unit, which may include:
- a terminal device configured to receive a broadcast message periodically sent by an IoT access point, and send a response message for the broadcast message, where the broadcast message includes a first time that the IoT access point sends the broadcast message a tag, the response message includes a terminal device type, the first time tag, a second time tag in which the terminal device receives the broadcast message, and a third time tag in which the terminal device sends the response message;
- the Internet of Things access point is configured to periodically send the broadcast message within its wireless network coverage, and receive the response message of the terminal device to the broadcast message; the Internet of Things access point and Aggregation unit time synchronization;
- the IoT access point is further configured to determine whether the terminal device type matches a device type specified by the aggregation unit;
- the IoT access point is further configured to obtain the Internet of Things according to the first time label, the second time label, the third time label, and a fourth time label that receives the response message. a time difference between the access point and the terminal device and sent to the terminal device;
- the terminal device is configured to perform time synchronization adjustment according to the time difference.
- the response message further includes a time type adopted by the terminal device
- the Internet of Things access point is further configured to use, according to the first time label, Obtaining, by the second time label, the third time label, and the fourth time label that receives the response message, a time difference between the Internet of Things access point and the terminal device, and sending the time difference to the terminal device
- the specific way is:
- the IoT access point is further configured to determine whether the time type used by the IoT access point is consistent with the time type adopted by the terminal device; if consistent, according to the first time label, the second time a label, the third time label, and a fourth time label that receives the response message, obtain a time difference between the Internet of Things access point and the terminal device, and send the time difference to the terminal device; if not, The first time tag is converted into a fifth time tag corresponding to the time type adopted by the terminal device, and the fourth time tag is converted into a sixth time tag corresponding to the time type adopted by the terminal device, according to the Determining, by the fifth time label, the sixth time label, the second time label, and the third time label, a time difference between the Internet of Things access point and the terminal device, and sending the time difference to the terminal device.
- the Internet of Things access point is further configured to invoke a time interface to use the time before periodically transmitting a broadcast message within a coverage of the wireless network.
- the interface interacts with the time server to synchronize the time synchronization signal to obtain a time offset from the time server;
- the IoT access point is further configured to adjust a time of the IoT access point according to the time offset to implement time synchronization with the aggregation unit.
- the IoT access point is further configured to invoke a time interface, and use the time interface, before periodically sending a broadcast message within a coverage of the wireless network.
- the way to synchronize the time synchronization signal with the time server and obtain the time offset from the time server is as follows:
- the IoT access point is further configured to call a time interface, and use the time interface to receive a first time synchronization signal transmitted by the time server on the dedicated subcarrier channel, before the broadcast message is periodically sent within the coverage of the wireless network.
- Obtaining a first time of arrival of the first time synchronization signal ; receiving, by using the time interface, a second time synchronization signal transmitted by the time server on the dedicated subcarrier channel, acquiring from the second time synchronization signal a first transmission time of the first time synchronization signal; transmitting, by the time interface, a third time synchronization signal to the time server, and recording a second transmission time for transmitting the third time synchronization signal; using the time Receiving, by the interface, a fourth time synchronization signal transmitted by the time server on the dedicated subcarrier channel, acquiring a second arrival time of the third time synchronization signal from the fourth time synchronization signal; Time, first transmission time, second transmission time, and second arrival time, obtained with the time server Time offset.
- the response message further includes terminal device address information
- the IoT access point is further configured to receive a response message of the terminal device to the broadcast message.
- the embodiment of the invention has the following beneficial effects:
- the IoT access point transmits a broadcast message including the first time tag in the coverage of the wireless network, and then receives a response message of the terminal device to the broadcast message, where the response message includes the terminal device type, and the first The time tag, the second time tag of the terminal device receiving the broadcast message, and the third time tag of the terminal device sending the response message, the IoT access point further determining whether the terminal device type matches the device type specified by the aggregation unit, if the Internet of Things The access point determines that the terminal device type matches the device type specified by the aggregation unit, and then obtains the time difference between the terminal device and the terminal device according to the first time tag, the second time tag, the third time tag, and the fourth time tag.
- the terminal device will adjust the time between it and the IoT access point according to the time difference, due to the time synchronization between the IoT access point and the aggregation unit, therefore, the time of the terminal device It is also synchronized with the aggregation unit after adjustment. It can be seen that, in the case that the IoT access point and the aggregation unit are time synchronized, the time between the terminal device and the aggregation unit is further improved based on the IoT access point, and the validity and reliability of the time data are improved.
- FIG. 1 is a schematic diagram of an Internet of Things architecture disclosed by some embodiments of the present invention.
- FIG. 2 is a schematic flowchart of a method for time synchronization of an Internet of Things terminal device and a convergence unit according to an embodiment of the present invention
- FIG. 3 is another schematic flowchart of a method for time synchronization of an Internet of Things terminal device and a convergence unit according to an embodiment of the present invention
- FIG. 4 is a schematic structural diagram of a time synchronization system of an Internet of Things terminal device and a convergence unit according to an embodiment of the present invention.
- the embodiment of the invention discloses a time synchronization method for an Internet of Things terminal device and a convergence unit, which is used for synchronizing the time between the Internet of Things terminal device and the aggregation unit.
- the embodiment of the invention correspondingly discloses a time synchronization system of the Internet of Things terminal device and the aggregation unit.
- FIG. 1 is a schematic diagram of an Internet of Things architecture disclosed in some embodiments of the present invention. It should be noted that FIG. 1 is only some implementations of the present invention. The schematic diagram of the disclosed Internet of Things architecture, and other schematic diagrams obtained by optimizing or deforming on the basis of FIG. 1 are all within the scope of protection of the present invention, and are not exemplified herein.
- the IoT architecture shown in FIG. 1 may include three layers of a terminal device layer, an access point layer, and an aggregation unit layer according to functions.
- the terminal device layer includes a large number of terminal devices located at the edge of the Internet of Things, such as a hygrometer, a smoke sensor, a ventilation device, a rain sensor, an irrigation valve, etc.; the access point layer may include a large number of IoT access points, and these Internet of Things access points can be interconnected by a network (not shown in Figure 1).
- the IoT access point may be a router, a repeater, or the like, which is not limited in the embodiment of the present invention.
- the aggregation unit layer may include a convergence unit, wherein the aggregation unit is used as a human-machine interface of the Internet of Things in the Internet of Things architecture, and is used for high-level management of the entire Internet of Things through the Internet of Things access point, including collecting a certain period of time.
- the data reported by the massive terminal equipment analyzes and decides the data, and then converts it into a simple warning, abnormal or related report required by the user; the aggregation unit can also obtain the information or configure the terminal device parameters by sending instructions (the data transmission direction at this time) Terminal devices; the aggregation unit can also introduce a variety of input services, from big data to social networks, and even from social tools "likes" to weather sharing.
- the IoT access point can use any standard networking protocol, and the IoT access point can implement data analysis between different network standards; in the IoT architecture shown in Figure 1, each IoT connection
- the ingress point can provide IoT data receiving and receiving services for a large number of terminal devices covered by its own wireless network, wherein each terminal device within the coverage of each IoT access point's own wireless network can have a built-in wireless communication module. This allows each IoT access point to communicate wirelessly with each terminal device within its coverage by wireless network communication.
- the wireless communication module built into the terminal device can input the upper frequency point 470MHz and the lower frequency point 510MHz during production, so that the wireless communication module can automatically define the communication frequency band as 470MHz ⁇ 510MHz, It complies with the provisions of China's SRRC standard; alternatively, it can input the upper frequency point of 868MHz and the lower frequency point of 908MHz, so that the wireless communication module can automatically define the communication frequency band as 868MHz to 908MHz to comply with the European ETSI standard; or, you can enter Frequency 918MHz, the lower frequency point is 928MHz, so the wireless communication module can automatically define the communication frequency band as 918MHz ⁇ 928MHz to meet the requirements of the US FCC standard; or, the communication frequency band of the wireless communication module can also be defined as conforming to the Japanese ARIB standard or the Canadian IC standard.
- the terminal device can use Frequency Division Multiple Access (FDMA), Frequency-Hopping Spread Spectrum (FHSS), and Dynamic Time Division Multiple Access (Dynamic Time Division Multiple Access). , DTDMA), and backtracking multiplexing (CSMA) are combined to solve the interference problem.
- FDMA Frequency Division Multiple Access
- FHSS Frequency-Hopping Spread Spectrum
- CSMA Dynamic Time Division Multiple Access
- FIG. 2 is a schematic flowchart of a method for time synchronization of an Internet of Things terminal device and a convergence unit according to an embodiment of the present invention
- a time synchronization method for an Internet of Things terminal device and a convergence unit may include :
- the Internet of Things access point sends a broadcast message within the coverage of the wireless network, and the broadcast message includes a first time label of the IoT access point to send the broadcast message, and the IoT access point and the convergence unit time synchronize;
- the IoT access point sends the broadcast message within the coverage of the wireless network when the IoT access point reaches the preset time synchronization period.
- the IoT access point receives the time synchronization period sent by the aggregation unit, and then sets the time synchronization period locally, and when the detection reaches the preset time synchronization period, the IoT access point is within the coverage of the wireless network. Send the broadcast message.
- the IoT access point before the IoT access point sends a broadcast message within the coverage of the wireless network, invokes the time interface, and uses the time interface to interact with the time server to synchronize the time signal to obtain the time server.
- the time offset between the Internet of Things access points adjusts the time of the IoT access point according to the time offset to achieve time synchronization with the aggregation unit.
- the IoT access point first completes time synchronization with the aggregation unit to ensure that the time between the synchronization of the terminal device and the aggregation unit based on the IoT access point is reliable.
- the IoT access point invokes the time interface, and the time synchronization signal is exchanged with the time server by using the time interface, and specifically includes:
- the IoT access point invokes a time interface, and receives a first time synchronization signal transmitted by the time server on the dedicated subcarrier channel by using the time interface, to obtain a first arrival time of the first time synchronization signal;
- the IoT access point receives the second time synchronization signal transmitted by the time server on the dedicated subcarrier channel by using the time interface, and acquires the first transmission time of the first time synchronization signal from the second time synchronization signal;
- the Internet of Things access point sends a third time synchronization signal to the time server by using the time interface, and records a second transmission time for transmitting the third time synchronization signal;
- the IoT access point utilizes a time interface, receives a fourth time synchronization signal transmitted by the time server on the dedicated subcarrier channel, and acquires a second arrival time of the third time synchronization signal from the fourth time synchronization signal;
- the Internet of Things access point obtains a time offset from the time server according to the first arrival time, the first transmission time, the second transmission time, and the second arrival time.
- the dedicated subcarrier channel can be selected in a frequency hopping manner between 100 MHz and 1 GHz, and one subcarrier channel between 100 MHz and 1 GHz is selected as a dedicated subcarrier channel for transmitting the first time synchronization signal.
- the dedicated subcarrier channel can also select a subcarrier channel with better channel quality as a dedicated subcarrier channel according to the quality of the channel.
- the second time synchronization signal is a follow-up signal of the first time synchronization signal, and the second time synchronization signal is issued after the first time synchronization signal is issued, wherein the second time synchronization signal includes a first transmission time of the first time synchronization signal.
- the second time synchronization signal may call the same dedicated subcarrier channel as the first time synchronization signal, or may call different dedicated subcarrier channels. If it is a different dedicated subcarrier channel, it may be selected by selecting a dedicated subcarrier channel with the first time synchronization signal.
- the third time synchronization is issued after receiving the first time synchronization signal. It can be understood that the third time synchronization signal can adopt the same dedicated subcarrier channel as the first time synchronization signal, and can also adopt a dedicated subcarrier channel different from the first time synchronization signal.
- the fourth time synchronization signal includes a second arrival time of the third time synchronization signal.
- the time offset between the IoT access point and the time server is as follows:
- Time offset between the Internet of Things access point and the time server [(first arrival time - first transmission time) - (second arrival time - second transmission time)] / 2
- the IoT access point adjusts its time according to the time offset, so that the IoT access point time is synchronized with the time server.
- the aggregation unit will also adjust the time to synchronize with the time server in this way, thereby achieving time synchronization between the IoT access point and the aggregation unit.
- the first transmission time, the first arrival time, the second transmission time, and the second arrival time are absolute times corresponding to (hours, minutes, seconds).
- the IoT access point receives a response message of the terminal device to the broadcast message, where the response message includes the terminal device type, the first time label, and the second time label that the terminal device receives the broadcast message. a third time label sent by the terminal device to the response message;
- the Internet of Things access point determines whether the terminal device type matches the device type specified by the aggregation unit.
- step 204 If the terminal device type matches the device type specified by the aggregation unit, go to step 204; if the terminal device type does not match the device type specified by the aggregation unit, the process ends.
- the Internet of Things access point obtains a time difference between the Internet of Things access point and the terminal device according to the first time label, the second time label, the third time label, and the fourth time label that receives the response message, and sends the time difference to the terminal. device;
- the terminal device performs time synchronization adjustment according to the time difference.
- the time difference between the IoT access point and the terminal device is as follows:
- Time difference between the IoT access point and the terminal device [(second time tag - first time tag) - (fourth time tag - third time tag)] / 2
- the first time label, the second time label, the third time label, and the fourth time label are absolute times corresponding to (hours, minutes, seconds).
- the IoT access point transmits a broadcast message including the first time tag in the coverage of the wireless network, and then receives a response message of the terminal device to the broadcast message, where the response message includes the terminal device type, and the first The time tag, the second time tag of the terminal device receiving the broadcast message, and the third time tag of the terminal device sending the response message, the IoT access point further determining whether the terminal device type matches the device type specified by the aggregation unit, if the Internet of Things The access point determines that the terminal device type matches the device type specified by the aggregation unit, and then obtains the time difference between the terminal device and the terminal device according to the first time tag, the second time tag, the third time tag, and the fourth time tag.
- the terminal device will adjust the time between it and the IoT access point according to the time difference, due to the time synchronization between the IoT access point and the aggregation unit, therefore, the time of the terminal device It is also synchronized with the aggregation unit after adjustment. It can be seen that, in the case that the IoT access point and the aggregation unit are time synchronized, the time between the terminal device and the aggregation unit is further improved based on the IoT access point, and the validity and reliability of the time data are improved.
- FIG. 3 is another schematic flowchart of a time synchronization method for an Internet of Things terminal device and a convergence unit according to an embodiment of the present invention
- FIG. 3 is a time synchronization method for an Internet of Things terminal device and a convergence unit.
- Can include:
- the IoT access point sends a broadcast message in the coverage of the wireless network, and the broadcast message includes a first time label of the IoT access point to send the broadcast message, and the IoT access point and the convergence unit time synchronize;
- the IoT access point receives a response message of the terminal device to the broadcast message, where the response message includes the terminal device type, the time type adopted by the terminal device, the first time label, the second time label of the terminal device receiving the broadcast message, and the terminal device. a third time stamp for sending a response message;
- the Internet of Things access point determines whether the terminal device type matches the device type specified by the aggregation unit.
- step 304 If the terminal device type matches the device type specified by the aggregation unit, go to step 304; if the terminal device type does not match the device type specified by the aggregation unit, the process ends.
- the response message further includes terminal device address information
- the IoT access point first determines the terminal device address before determining whether the terminal device type matches the device type specified by the aggregation unit. Whether the information matches the location information specified by the aggregation unit. If it matches, the IoT access point further determines whether the terminal device type matches the device type specified by the aggregation unit.
- the location information specified by the aggregation unit may include a farm, a garage, or a viaduct.
- the aggregation unit needs to specify a certain terminal device type (smoke detector) under the location information (garage) to transmit data on time, and further, the time between the terminal device and the aggregation unit needs to be synchronized.
- the response message further includes a time period in which the terminal device uploads data
- the IoT access point first determines whether the terminal device type matches the device type specified by the aggregation unit, and the Internet of Things access point first Determining whether the time period for the terminal device to upload data matches the time period that the aggregation unit is interested in. If the match is made, the IoT access point further determines whether the terminal device type matches the device type specified by the aggregation unit.
- the aggregation unit needs to specify a certain terminal device type (smoke sensor) under the location information (garage) to transmit data for a certain period of time (23:00 ⁇ 5:00), by synchronizing the terminal device and the aggregation unit. The time between the terminals enables the terminal device to upload data during the time period in which the aggregation unit is interested.
- the Internet of Things access point determines whether the type of time used by the Internet of Things access point is consistent with the type of time used by the terminal device;
- step 305 If the time type adopted by the IoT access point is consistent with the time type adopted by the terminal device, the process proceeds to step 305. If the time type adopted by the Internet of Things access point is different from the time type adopted by the terminal device, the process proceeds to step 306.
- Types of time include Chinese clock, British clock, Korean clock and so on.
- the IoT access point obtains a time difference between the IoT access point and the terminal device according to the first time label, the second time label, the third time label, and the fourth time label that receives the response message, and sends the time difference to the terminal. device;
- step 305 After step 305 is performed, the process proceeds to step 307.
- the Internet of Things access point converts the first time label into a time type corresponding to the terminal device. a fifth time label, and a sixth time label corresponding to the time type adopted by the terminal device, and the obtained according to the fifth time label, the sixth time label, the second time label, and the third time label a time difference between the networked access point and the terminal device and sent to the terminal device;
- step 306 After step 306 is performed, the process proceeds to step 307.
- the terminal device performs time synchronization adjustment according to the time difference.
- the time between the terminal device and the aggregation unit is further synchronized based on the IoT access point.
- the terminal device type matches the device type specified by the aggregation unit, further ensure that the time type adopted by the terminal device is the same as that of the Internet of Things access point, and if the same, directly calculate the Internet of Things access point and If the time difference between the terminal devices is different, the time conversion is performed first, and then the time difference between the Internet of Things access point and the terminal device is calculated.
- FIG. 4 is a schematic structural diagram of a time synchronization system of an Internet of Things terminal device and a convergence unit according to an embodiment of the present invention
- a time synchronization system of an Internet of Things terminal device and a convergence unit may include :
- the terminal device 410 is configured to receive a broadcast message periodically sent by the Internet of Things access point 420, and send a response message for the broadcast message, where the broadcast message includes a first time label that the Internet of Things access point 420 sends the broadcast message, and the response message
- the Internet of Things access point 420 is configured to periodically send a broadcast message within its wireless network coverage, and receive a response message of the terminal device 410 to the broadcast message; the Internet of Things access point 420 is time synchronized with the aggregation unit 430;
- the Internet of Things access point 420 is further configured to determine whether the terminal device type matches the device type specified by the aggregation unit 430;
- the IoT access point 420 is further configured to obtain, between the IoT access point 420 and the terminal device 410, according to the first time tag, the second time tag, the third time tag, and the fourth time tag that receives the response message. Time difference and sent to the terminal device 410;
- the terminal device 410 is configured to perform time synchronization adjustment according to the time difference.
- the Internet of Things access point 420 when the Internet of Things access point 420 detects that the preset time synchronization period has elapsed, the Internet of Things access point 420 transmits the broadcast message within its wireless network coverage.
- the Internet of Things access point 420 receives the time synchronization period sent by the aggregation unit 430, and then sets the time synchronization period locally, and when the detection reaches a preset time synchronization period, the Internet of Things access point 420 is in its wireless network.
- the broadcast message is sent within the coverage.
- the response message further includes a time type adopted by the terminal device 410.
- the Internet of Things access point 420 is further configured to receive the response according to the first time label, the second time label, the third time label, and the received response.
- the fourth time label of the message is obtained by the time difference between the IoT access point 420 and the terminal device 410 and sent to the terminal device 410.
- the IoT access point 420 is further configured to determine whether the type of time taken by the terminal is consistent with the type of time used by the terminal device 410; if consistent, according to the first time tag, the second time tag, the third time tag, and the received response
- the fourth time label of the message obtains the time difference between the Internet of Things access point 420 and the terminal device 410 and sends the time difference to the terminal device 410. If not, the first time tag is converted into the fifth time corresponding to the time type adopted by the terminal device 410.
- the time tag and the sixth time tag corresponding to the time type adopted by the terminal device 410 are obtained, and the Internet of Things is obtained according to the fifth time tag, the sixth time tag, the second time tag, and the third time tag.
- the time difference between the ingress point 420 and the terminal device 410 is sent to the terminal device 410.
- the response message further includes terminal device address information
- the IoT access point 420 is further configured to: after receiving the response message of the terminal device 410 to the broadcast message, and determining whether the terminal device type and the convergence unit 430 Before the specified device types match, it is determined whether the terminal device address information matches the location information specified by the aggregation unit 430. If the matching is performed, it is determined whether the terminal device type matches the device type specified by the aggregation unit 430.
- the location information specified by the aggregation unit 430 may include a certain farm, a certain garage, or a viaduct.
- the aggregation unit 430 needs to specify a certain terminal device type (smoke detector) under the location information (garage) to transmit data on time, and further, the time between the terminal device 410 and the aggregation unit 430 needs to be synchronized.
- the response message further includes a time period in which the terminal device 410 uploads data
- the IoT access point 420 determines whether the terminal device type matches the device type specified by the convergence unit 430, and the Internet of Things is connected.
- the ingress point 420 first determines whether the time period in which the terminal device 410 uploads data matches the time period in which the aggregation unit 430 is interested. If it matches, the IoT access point 420 further determines whether the terminal device type and the device type specified by the aggregation unit 430. Match.
- the aggregation unit 430 needs to specify a certain terminal device type (smoke detector) under the location information (garage) to transmit data for a certain period of time (23:00 to 5:00), by synchronizing the terminal device 410 with The time between the aggregation units 430 enables the terminal device 410 to upload data during the time period in which the aggregation unit 430 is interested.
- a certain terminal device type smoke detector
- garage location information
- the Internet of Things access point 420 is further configured to: before the broadcast message is periodically sent within the coverage of the wireless network, invoke the time interface, and use the time interface to interact with the time server to obtain a time synchronization signal. Time offset between time servers;
- the Internet of Things access point 420 is further configured to adjust the Internet of Things access point 420 according to the time offset. Time to achieve time synchronization with the aggregation unit 430.
- the Internet of Things access point 420 is further configured to invoke a time interface before using the time interface to periodically send a broadcast message, and use the time interface to interact with the time server to obtain a time synchronization signal.
- the way of time offset between servers is as follows:
- the Internet of Things access point 420 is further configured to call a time interface before receiving a broadcast message periodically within its wireless network coverage, and receive a first time synchronization signal transmitted by the time server on the dedicated subcarrier channel by using the time interface to obtain the first a first time of arrival of the time synchronization signal; receiving, by the time interface, a second time synchronization signal transmitted by the time server on the dedicated subcarrier channel, acquiring a first transmission time of the first time synchronization signal from the second time synchronization signal; utilizing time The interface sends a third time synchronization signal to the time server, and records a second transmission time for transmitting the third time synchronization signal; and uses the time interface to receive the fourth time synchronization signal transmitted by the time server on the dedicated subcarrier channel, from the fourth time Obtaining a second arrival time of the third time synchronization signal in the synchronization signal; obtaining a time offset from the time server according to the first arrival time, the first transmission time, the second transmission time, and the second arrival time.
- the dedicated subcarrier channel can be selected in a frequency hopping manner between 100 MHz and 1 GHz, and one subcarrier channel between 100 MHz and 1 GHz is selected as a dedicated subcarrier channel for transmitting the first time synchronization signal.
- the dedicated subcarrier channel can also select a subcarrier channel with better channel quality as a dedicated subcarrier channel according to the quality of the channel.
- the second time synchronization signal is a follow-up signal of the first time synchronization signal, and the second time synchronization signal is issued after the first time synchronization signal is issued, wherein the second time synchronization signal includes a first transmission time of the first time synchronization signal.
- the second time synchronization signal may call the same dedicated subcarrier channel as the first time synchronization signal, or may call different dedicated subcarrier channels. If it is a different dedicated subcarrier channel, it may be selected by selecting a dedicated subcarrier channel with the first time synchronization signal.
- the third time synchronization is issued after receiving the first time synchronization signal. It can be understood that the third time synchronization signal can adopt the same dedicated subcarrier channel as the first time synchronization signal, and can also adopt a dedicated subcarrier channel different from the first time synchronization signal.
- the fourth time synchronization signal includes a second arrival time of the third time synchronization signal.
- Equation 1 the time offset between the Internet of Things access point 420 and the time server is as shown in Equation 1:
- Time offset [(first arrival time - first transmission time) - (second arrival time - second transmission time)] / 2 formula 1
- the IoT access point 420 then adjusts its time based on the time offset, which is synchronized with the time server.
- the aggregation unit 430 will also adjust the time to synchronize with the time server in this manner, thereby implementing time synchronization between the Internet of Things access point 420 and the aggregation unit 430.
- the first transmission time, the first arrival time, the second transmission time, and the second arrival time are absolute times corresponding to (hours, minutes, seconds).
- the time between the terminal device 410 and the aggregation unit 430 is further synchronized based on the Internet of Things access point 420.
- ROM Read-Only Memory
- RAM Random Access Memory
- PROM Programmable Read-Only Memory
- EPROM Erasable Programmable Read Only Memory
- OTPROM One-Time Programmable Read-Only Memory
- EEPROM Electronically-Erasable Programmable Read-Only Memory
- CD-ROM Compact Disc Read-Only Memory
Abstract
本发明实施例涉及物联网技术领域，公开了一种物联网终端设备与汇聚单元的时间同步方法及系统，该方法包括：物联网接入点在其无线网络覆盖范围内发送包括第一时间标签的广播消息，以及接收终端设备发送的包括终端设备类型、第一时间标签、终端设备接收到广播消息的第二时间标签和终端设备发送响应消息的第三时间标签的响应消息，判断终端设备类型是否与汇聚单元指定的设备类型相匹配，如果是，根据第一时间标签、第二时间标签、第三时间标签和接收到响应消息的第四时间标签，获得物联网接入点与终端设备之间的时间差并发送给终端设备；终端设备根据时间差，进行时间同步调整；用于同步物联网终端设备与汇聚单元之间的时间。
Description
本发明涉及物联网技术领域，具体涉及一种物联网终端设备与汇聚单元的时间同步方法及系统。
物联网通过传感器、射频识别技术、定位技术等实时采集任何需要监控、互动的物体或者过程，采集其声光热电、力学、化学、生物等各种需要的信息，通过各类终端设备接入网络，实现物与物、物与人的连接，实现对物体或者过程的智能化感知和管理。物联网中的终端设备通过物联网接入节点接入到物联网，将采集的数据上报给汇聚单元，由汇聚单元对终端设备产生的数据进行分析和处理。
物联网中终端设备的数量比较庞大，汇聚单元通常只从其感兴趣的终端设备处收集数据，这就需要它对表征时间、特定类型等相关特征的小数据流进行分析，但是由于物联网设备具有独立的时间系统，在使用表征时间这一特征时，需要确保所采用的时间数据的可靠性。
发明内容
本发明实施例公开了一种物联网终端设备与汇聚单元的时间同步方法及系统，用于同步物联网终端设备与汇聚单元之间的时间。
本发明第一方面公开了一种物联网终端设备与汇聚单元的时间同步方法，可包括：
物联网接入点在其无线网络覆盖范围内发送广播消息，所述广播消息包括所述物联网接入点发送所述广播消息的第一时间标签，所述物联网接入点与汇聚单元时间同步；
所述物联网接入点接收终端设备对所述广播消息的响应消息，所述响应消息包括终端设备类型、所述第一时间标签、所述终端设备接收到所述广播消息的第二时间标签和所述终端设备发送所述响应消息的第三时间标签；
所述物联网接入点判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配；
如果匹配，所述物联网接入点根据所述第一时间标签、所述第二时间标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备；
所述终端设备根据所述时间差，进行时间同步调整。
作为一种可选的实施方式，在本发明第一方面中，所述响应消息还包括所述终端设备采用的时刻类型；所述物联网接入点根据所述第一时间标签、所述第二时间标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备，包括：
所述物联网接入点判断其所采用的时刻类型与所述终端设备采用的时刻类型是否一致；
如果一致，所述物联网接入点根据所述第一时间标签、所述第二时间标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备；
如果不一致，所述物联网接入点将所述第一时间标签转换成所述终端设备采用的时刻类型对应的第五时间标签、以及将所述第四时间标签转换成所述终端设备采用的时刻类型对应的第六时间标签，根据所述第五时间标签、所述第六时间标签、所述第二时间标签和所述第三时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备。
作为一种可选的实施方式，在本发明第一方面中，所述物联网接入点在其无线网络覆盖范围内发送广播消息之前，所述方法还包括：
所述物联网接入点调用时间接口，利用所述时间接口与时间服务器交互时间同步信号，获得与所述时间服务器之间的时间偏移量；
所述物联网接入点根据所述时间偏移量，调整所述物联网接入点的时间，以实现与所述汇聚单元之间的时间同步。
作为一种可选的实施方式，在本发明第一方面中，所述物联网接入点调用时间接口，利用所述时间接口与时间服务器交互时间同步信号，获得与所述时间服务器之间的时间偏移量，包括：
所述物联网接入点调用时间接口，利用所述时间接口接收时间服务器在专用子载波信道上传输的第一时间同步信号，获得所述第一时间同步信号的第一到达时间；
所述物联网接入点利用所述时间接口接收所述时间服务器在所述专用子载波信道上传输的第二时间同步信号，从所述第二时间同步信号中获取所述第一时间同步信号的第一发送时间；
所述物联网接入点利用所述时间接口向所述时间服务器发送第三时间同步信号，并记录发送所述第三时间同步信号的第二发送时间；
所述物联网接入点利用所述时间接口，接收所述时间服务器在所述专用
子载波信道上传输的第四时间同步信号，从所述第四时间同步信号中获取所述第三时间同步信号的第二到达时间；
所述物联网接入点根据第一到达时间、第一发送时间、第二发送时间和第二到达时间，获得与所述时间服务器之间的时间偏移量。
作为一种可选的实施方式，在本发明第一方面中，所述响应消息还包括终端设备地址信息，所述物联网接入点接收终端设备对所述广播消息的响应消息之后，以及所述物联网接入点判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配之前，所述方法还包括：
所述物联网接入点判断所述终端设备地址信息是否与所述汇聚单元指定的位置信息相匹配，如果匹配，所述物联网接入点执行判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配的步骤。
本发明第二方面公开了一种物联网终端设备与汇聚单元的时间同步系统，可包括：
终端设备，用于接收物联网接入点周期性发送的广播消息，以及发送针对所述广播消息的响应消息，所述广播消息包括所述物联网接入点发送所述广播消息的第一时间标签，所述响应消息包括终端设备类型、所述第一时间标签、所述终端设备接收到所述广播消息的第二时间标签和所述终端设备发送所述响应消息的第三时间标签；
所述物联网接入点，用于在其无线网络覆盖范围内周期性发送所述广播消息，以及接收所述终端设备对所述广播消息的所述响应消息；所述物联网接入点与汇聚单元时间同步；
所述物联网接入点还用于，判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配；
所述物联网接入点还用于，根据所述第一时间标签、所述第二时间标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备；
所述终端设备，用于根据所述时间差，进行时间同步调整。
作为一种可选的实施方式，在本发明第二方面中，所述响应消息还包括所述终端设备采用的时刻类型；所述物联网接入点还用于根据所述第一时间标签、所述第二时间标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备的方式具体为：
所述物联网接入点还用于，判断其所采用的时刻类型与所述终端设备采用的时刻类型是否一致；如果一致，根据所述第一时间标签、所述第二时间
标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备；如果不一致，将所述第一时间标签转换成所述终端设备采用的时刻类型对应的第五时间标签、以及将所述第四时间标签转换成所述终端设备采用的时刻类型对应的第六时间标签，根据所述第五时间标签、所述第六时间标签、所述第二时间标签和所述第三时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备。
作为一种可选的实施方式，在本发明第二方面中，所述物联网接入点还用于，在其无线网络覆盖范围内周期性发送广播消息之前，调用时间接口，利用所述时间接口与时间服务器交互时间同步信号，获得与所述时间服务器之间的时间偏移量；
所述物联网接入点还用于，根据所述时间偏移量，调整所述物联网接入点的时间，以实现与所述汇聚单元之间的时间同步。
作为一种可选的实施方式，在本发明第二方面中，所述物联网接入点还用于在其无线网络覆盖范围内周期性发送广播消息之前，调用时间接口，利用所述时间接口与时间服务器交互时间同步信号，获得与所述时间服务器之间的时间偏移量的方式具体为：
所述物联网接入点还用于在其无线网络覆盖范围内周期性发送广播消息之前，调用时间接口，利用所述时间接口接收时间服务器在专用子载波信道上传输的第一时间同步信号，获得所述第一时间同步信号的第一到达时间；利用所述时间接口接收所述时间服务器在所述专用子载波信道上传输的第二时间同步信号，从所述第二时间同步信号中获取所述第一时间同步信号的第一发送时间；利用所述时间接口向所述时间服务器发送第三时间同步信号，并记录发送所述第三时间同步信号的第二发送时间；利用所述时间接口，接收所述时间服务器在所述专用子载波信道上传输的第四时间同步信号，从所述第四时间同步信号中获取所述第三时间同步信号的第二到达时间；根据第一到达时间、第一发送时间、第二发送时间和第二到达时间，获得与所述时间服务器之间的时间偏移量。
作为一种可选的实施方式，在本发明第二方面中，所述响应消息还包括终端设备地址信息，所述物联网接入点还用于在接收终端设备对所述广播消息的响应消息之后，以及判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配之前，判断所述终端设备地址信息是否与所述汇聚单元指定的位置信息相匹配，如果匹配，执行判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配。
与现有技术相比，本发明实施例具有以下有益效果：
在本发明实施例中，物联网接入点在其无线网络覆盖范围内发送包括第一时间标签的广播消息，然后接收终端设备对该广播消息的响应消息，响应消息包括终端设备类型、第一时间标签、终端设备接收到广播消息的第二时间标签和终端设备发送响应消息的第三时间标签，物联网接入点进一步判断终端设备类型与汇聚单元指定的设备类型是否相匹配，如果物联网接入点确定出终端设备类型与汇聚单元指定的设备类型相匹配，那么将根据第一时间标签、第二时间标签、第三时间标签和第四时间标签，获取其与终端设备之间的时间差，然后将时间差发送给终端设备，最后，终端设备将根据时间差调整其与物联网接入点之间的时间，由于物联网接入点与汇聚单元之间的时间同步，因此，终端设备的时间在调整后也与汇聚单元同步。可以看出，本发明实施例在物联网接入点与汇聚单元时间同步的情况下，进一步基于物联网接入点同步终端设备与汇聚单元之间的时间，提高时间数据的有效和可靠性。
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明一些实施例公开的物联网架构示意图；
图2为本发明实施例公开的物联网终端设备与汇聚单元的时间同步方法的流程示意图；
图3为本发明实施例公开的物联网终端设备与汇聚单元的时间同步方法的另一流程示意图；
图4为本发明实施例公开的物联网终端设备与汇聚单元的时间同步系统的结构示意图。
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明的是，本发明实施例的术语“包括”和“具有”以及他们的任
何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
本发明实施例公开了一种物联网终端设备与汇聚单元的时间同步方法，用于同步物联网终端设备与汇聚单元之间的时间。本发明实施例相应地公开了一种物联网终端设备与汇聚单元的时间同步系统。
在介绍本发明技术方案之前，先简单介绍本发明一些实施例公开的物联网架构，图1为本发明一些实施例公开的物联网架构示意图，需要说明的是，图1仅为本发明一些实施例公开的物联网架构示意图，其它在图1基础上进行优化或者变形得到的示意图均属于本发明的保护范围，在此不再一一举例。图1所示的物联网架构按照功能划分可以包括终端设备层、接入点层以及汇聚单元层三个层。其中，终端设备层包括位于物联网边缘的海量终端设备，例如湿度计、烟感器、通风设备、雨量传感器、灌溉阀等等；接入点层可以包括大量物联网接入点，这些大量的物联网接入点之间可以通过网络互联(图1未全部示出)。在接入点层中，物联网接入点可以是路由器、中继器等各种中间设备，本发明实施例不作限定。汇聚单元层可以包括汇聚单元，其中，汇聚单元在这种物联网架构中用作物联网的人机接口，用于通过物联网接入点对整个物联网进行高层管理，包括收集某段时间内的海量终端设备上报的数据，对数据进行分析和决策，然后转化成为用户需要的简单预警、异常或者相关报告；汇聚单元还可以通过发指令去获取信息或者配置终端设备参数(此时数据的传输指向终端设备)；汇聚单元还可以引入各种输入业务，从大数据到社交网络、甚至从社交工具“点赞”到天气分享等。另外，物联网接入点可以使用任何标准的组网协议，而且物联网接入点可以在不同的网络制式之间实现数据解析；在图1所示的物联网架构中，每一个物联网接入点可以为其自身无线网络所覆盖范围内的海量终端设备提供物联网数据收发服务，其中，每一个物联网接入点自身无线网络所覆盖范围内的每一个终端设备可以内置有无线通讯模块，这使得每一个物联网接入点可以通过无线网络通讯方式与自身无线网络所覆盖范围内的每一个终端设备进行无线通讯。在图1所示的物联网架构中，终端设备内置的无线通讯模块在生产时，可以输入上频点470MHz，下频点510MHz，这样无线通讯模块可以自动将通讯频段定义为470MHz～510MHz，以符合中国SRRC标准的规定；或者，也可以输入上频点868MHz，下频点908MHz，这样无线通讯模块可以自动将通讯频段定义为868MHz～908MHz，以符合欧洲ETSI标准的规定；或者，可以输入上频点
918MHz，下频点928MHz，这样无线通讯模块可以自动将通讯频段定义为918MHz～928MHz，以符合美国FCC标准的规定；或者，无线通讯模块的通讯频段也可以定义为符合日本ARIB标准或加拿大IC标准的规定，本发明实施例不作限定。在图1所示的物联网架构中，终端设备可以采用频分复用(Frequency Division Multiple Access，FDMA)、跳频(Frequency-Hopping Spread Spectrum，FHSS)、动态时分复用(Dynamic Time Division Multiple Access，DTDMA)、退避复用(CSMA)相结合的方法来解决干扰问题。
基于上述介绍，下面将结合具体实施例，对本发明技术方案进行详细说明。
实施例一
请参阅图2，图2为本发明实施例公开的物联网终端设备与汇聚单元的时间同步方法的流程示意图；如图2所示，一种物联网终端设备与汇聚单元的时间同步方法可包括：
201、物联网接入点在其无线网络覆盖范围内发送广播消息，广播消息包括物联网接入点发送广播消息的第一时间标签，物联网接入点与汇聚单元时间同步；
其中，物联网接入点在检测到达预设的时间同步周期时，物联网接入点在其无线网络覆盖范围内发送该广播消息。
进一步地，物联网接入点接收汇聚单元发送的时间同步周期，然后在本地设置该时间同步周期，并在检测到达预设的时间同步周期时，物联网接入点在其无线网络覆盖范围内发送该广播消息。
作为一种可选的实施方式，物联网接入点在其无线网络覆盖范围内发送广播消息之前，物联网接入点调用时间接口，利用时间接口与时间服务器交互时间同步信号，获得与时间服务器之间的时间偏移量；物联网接入点根据时间偏移量，调整物联网接入点的时间，以实现与汇聚单元之间的时间同步。在该实施方式中，物联网接入点先完成与汇聚单元之间的时间同步，以确保后续基于物联网接入点同步终端设备与汇聚单元之间的时间是可靠的。
进一步地，物联网接入点调用时间接口，利用时间接口与时间服务器交互时间同步信号具体包括：
物联网接入点调用时间接口，利用时间接口接收时间服务器在专用子载波信道上传输的第一时间同步信号，获得第一时间同步信号的第一到达时间；
物联网接入点利用时间接口接收时间服务器在专用子载波信道上传输的第二时间同步信号，从第二时间同步信号中获取第一时间同步信号的第一发送时间；
物联网接入点利用时间接口向时间服务器发送第三时间同步信号，并记录发送第三时间同步信号的第二发送时间；
物联网接入点利用时间接口，接收时间服务器在专用子载波信道上传输的第四时间同步信号，从第四时间同步信号中获取第三时间同步信号的第二到达时间；
物联网接入点根据第一到达时间、第一发送时间、第二发送时间和第二到达时间，获得与时间服务器之间的时间偏移量。
其中，在上述实施方式中，专用子载波信道可以在100MHz～1GHz之间以跳频方式选择，选择出100MHz～1GHz之间的一个子载波信道作为传输第一时间同步信号的专用子载波信道。另外，专用子载波信道也可以根据信道的质量选择信道质量较好的子载波信道作为专用子载波信道。
第二时间同步信号是第一时间同步信号的跟随信号，第二时间同步信号在第一时间同步信号发出之后发出，其中，第二时间同步信号包括第一时间同步信号的第一发送时间。第二时间同步信号可以调用与第一时间同步信号相同的专用子载波信道，也可以调用不同的专用子载波信道。如果是不同的专用子载波信道，可以采用与第一时间同步信号选择专用子载波信道的方法进行选择。
第三时间同步是在接收到第一时间同步信号后发出。可以理解，第三时间同步信号可以采用与第一时间同步信号相同的专用子载波信道、也可以采用与第一时间同步信号不同的专用子载波信道。
第四时间同步信号包括第三时间同步信号的第二到达时间。
实际情况下，从物联网接入点到时间服务器之间，以及时间服务器到物联网接入点之间都存在着网络时延，但是由于这两种网络时延是双向的，符合平均值为0，因此，物联网接入点与时间服务器之间的时间偏移量如下公式所示：
物联网接入点与时间服务器之间的时间偏移量＝【(第一到达时间-第一发送时间)-(第二到达时间-第二发送时间)】/2
物联网接入点根据时间偏移量调整自身的时间，使得物联网接入点时间与时间服务器同步。另外，汇聚单元也将通过该种方式将时间调整到与时间服务器同步，从而实现物联网接入点与汇聚单元之间的时间同步。
第一发送时间、第一到达时间、第二发送时间和第二到达时间为(时，分，秒)对应的绝对时间。
202、物联网接入点接收终端设备对广播消息的响应消息，响应消息包括终端设备类型、第一时间标签、终端设备接收到广播消息的第二时间标签和
终端设备发送响应消息的第三时间标签；
203、物联网接入点判断终端设备类型是否与汇聚单元指定的设备类型相匹配；
其中，如果终端设备类型与汇聚单元指定的设备类型相匹配，转向步骤204；如果终端设备类型与汇聚单元指定的设备类型谢不匹配，则结束流程。
204、物联网接入点根据第一时间标签、第二时间标签、第三时间标签和接收到响应消息的第四时间标签，获得物联网接入点与终端设备之间的时间差并发送给终端设备；
205、终端设备根据时间差，进行时间同步调整。
物联网接入点与终端设备之间的时间差，如下公式所示：
物联网接入点与终端设备之间的时间差＝【(第二时间标签-第一时间标签)-(第四时间标签-第三时间标签)】/2
第一时间标签、第二时间标签、第三时间标签和第四时间标签为(时，分，秒)对应的绝对时间。
在本发明实施例中，物联网接入点在其无线网络覆盖范围内发送包括第一时间标签的广播消息，然后接收终端设备对该广播消息的响应消息，响应消息包括终端设备类型、第一时间标签、终端设备接收到广播消息的第二时间标签和终端设备发送响应消息的第三时间标签，物联网接入点进一步判断终端设备类型与汇聚单元指定的设备类型是否相匹配，如果物联网接入点确定出终端设备类型与汇聚单元指定的设备类型相匹配，那么将根据第一时间标签、第二时间标签、第三时间标签和第四时间标签，获取其与终端设备之间的时间差，然后将时间差发送给终端设备，最后，终端设备将根据时间差调整其与物联网接入点之间的时间，由于物联网接入点与汇聚单元之间的时间同步，因此，终端设备的时间在调整后也与汇聚单元同步。可以看出，本发明实施例在物联网接入点与汇聚单元时间同步的情况下，进一步基于物联网接入点同步终端设备与汇聚单元之间的时间，提高时间数据的有效和可靠性。
实施例二
请参阅图3，图3为本发明实施例公开的物联网终端设备与汇聚单元的时间同步方法的另一流程示意图；如图3所示，一种物联网终端设备与汇聚单元的时间同步方法可包括：
301、物联网接入点在其无线网络覆盖范围内发送广播消息，广播消息包括物联网接入点发送广播消息的第一时间标签，物联网接入点与汇聚单元时间同步；
302、物联网接入点接收终端设备对广播消息的响应消息，响应消息包括终端设备类型、终端设备采用的时刻类型、第一时间标签、终端设备接收到广播消息的第二时间标签和终端设备发送响应消息的第三时间标签；
303、物联网接入点判断终端设备类型是否与汇聚单元指定的设备类型相匹配；
其中，如果终端设备类型与汇聚单元指定的设备类型相匹配，转向步骤304；如果终端设备类型与汇聚单元指定的设备类型谢不匹配，结束流程。
作为一种可选的实施方式，响应消息中还包括终端设备地址信息，物联网接入点判断终端设备类型是否与汇聚单元指定的设备类型相匹配之前，物联网接入点先判断终端设备地址信息是否与汇聚单元指定的位置信息相匹配，如果匹配，物联网接入点再进一步判断终端设备类型是否与汇聚单元指定的设备类型相匹配。其中，汇聚单元指定的位置信息可以包括某个农场、某个车库或者某个高架桥等。举例来说，汇聚单元需要指定位置信息(车库)下的某种终端设备类型(烟感器)能够按时发送数据，进而，需要同步终端设备与汇聚单元之间的时间。
作为另一种可选的实施方式，响应消息中还包括终端设备上传数据的时间段，物联网接入点判断终端设备类型是否与汇聚单元指定的设备类型相匹配之前，物联网接入点先判断终端设备上传数据的时间段是否与汇聚单元感兴趣的时间段相匹配，如果匹配，物联网接入点再进一步判断终端设备类型是否与汇聚单元指定的设备类型相匹配。举例来说，汇聚单元需要指定位置信息(车库)下的某种终端设备类型(烟感器)能够在某个时间段(23:00～5:00)发送数据，通过同步终端设备与汇聚单元之间的时间，使终端设备能够在汇聚单元感兴趣的时间段上传数据。
304、物联网接入点判断其所采用的时刻类型与终端设备采用的时刻类型是否一致；
其中，如果物联网接入点所采用的时刻类型与终端设备采用的时刻类型一致，转向步骤305；如果物联网接入点所采用的时刻类型与终端设备采用的时刻类型不一致，转向步骤306。
时刻类型包括中国时钟、英国时钟、韩国时钟等。
305、物联网接入点根据第一时间标签、第二时间标签、第三时间标签和接收到响应消息的第四时间标签，获得物联网接入点与终端设备之间的时间差并发送给终端设备；
执行完步骤305后，转向步骤307。
306、物联网接入点将第一时间标签转换成终端设备采用的时刻类型对应
的第五时间标签、以及将第四时间标签转换成终端设备采用的时刻类型对应的第六时间标签，根据第五时间标签、第六时间标签、第二时间标签和第三时间标签，获得物联网接入点与终端设备之间的时间差并发送给终端设备；
执行完步骤306后，转向步骤307。
307、终端设备根据时间差，进行时间同步调整。
可以看出，本发明实施例在物联网接入点与汇聚单元时间同步的情况下，进一步基于物联网接入点同步终端设备与汇聚单元之间的时间。首先，在终端设备类型与汇聚单元指定的设备类型相匹配的情况下，进一步地，确保终端设备采用的时刻类型是否与物联网接入点的相同，如果相同，直接计算物联网接入点与终端设备之间的时间差，如果不相同，先进行时间换算，再计算物联网接入点与终端设备之间的时间差。
实施例三
请参阅图4，图4为本发明实施例公开的物联网终端设备与汇聚单元的时间同步系统的结构示意图；如图4所示，一种物联网终端设备与汇聚单元的时间同步系统可包括：
终端设备410，用于接收物联网接入点420周期性发送的广播消息，以及发送针对广播消息的响应消息，广播消息包括物联网接入点420发送广播消息的第一时间标签，该响应消息包括终端设备类型、第一时间标签、终端设备410接收到广播消息的第二时间标签和终端设备410发送响应消息的第三时间标签；
物联网接入点420，用于在其无线网络覆盖范围内周期性发送广播消息，以及接收终端设备410对广播消息的响应消息；物联网接入点420与汇聚单元430时间同步；
物联网接入点420还用于，判断终端设备类型是否与汇聚单元430指定的设备类型相匹配；
物联网接入点420还用于，根据第一时间标签、第二时间标签、第三时间标签和接收到响应消息的第四时间标签，获得物联网接入点420与终端设备410之间的时间差并发送给终端设备410；
终端设备410，用于根据时间差，进行时间同步调整。
其中，物联网接入点420在检测到达预设的时间同步周期时，物联网接入点420在其无线网络覆盖范围内发送该广播消息。
进一步地，物联网接入点420接收汇聚单元430发送的时间同步周期，然后在本地设置该时间同步周期，并在检测到达预设的时间同步周期时，物联网接入点420在其无线网络覆盖范围内发送该广播消息。
作为一种可选的实施方式，该响应消息还包括终端设备410采用的时刻类型；物联网接入点420还用于根据第一时间标签、第二时间标签、第三时间标签和接收到响应消息的第四时间标签，获得物联网接入点420与终端设备410之间的时间差并发送给终端设备410的方式具体为：
物联网接入点420还用于，判断其所采用的时刻类型与终端设备410采用的时刻类型是否一致；如果一致，根据第一时间标签、第二时间标签、第三时间标签和接收到响应消息的第四时间标签，获得物联网接入点420与终端设备410之间的时间差并发送给终端设备410；如果不一致，将第一时间标签转换成终端设备410采用的时刻类型对应的第五时间标签、以及将第四时间标签转换成终端设备410采用的时刻类型对应的第六时间标签，根据第五时间标签、第六时间标签、第二时间标签和第三时间标签，获得物联网接入点420与终端设备410之间的时间差并发送给终端设备410。
作为一种可选的实施方式，响应消息还包括终端设备地址信息，物联网接入点420还用于在接收终端设备410对广播消息的响应消息之后，以及判断终端设备类型是否与汇聚单元430指定的设备类型相匹配之前，判断终端设备地址信息是否与汇聚单元430指定的位置信息相匹配，如果匹配，执行判断终端设备类型是否与汇聚单元430指定的设备类型相匹配。其中，汇聚单元430指定的位置信息可以包括某个农场、某个车库或者某个高架桥等。举例来说，汇聚单元430需要指定位置信息(车库)下的某种终端设备类型(烟感器)能够按时发送数据，进而，需要同步终端设备410与汇聚单元430之间的时间。
作为另一种可选的实施方式，响应消息中还包括终端设备410上传数据的时间段，物联网接入点420判断终端设备类型是否与汇聚单元430指定的设备类型相匹配之前，物联网接入点420先判断终端设备410上传数据的时间段是否与汇聚单元430感兴趣的时间段相匹配，如果匹配，物联网接入点420再进一步判断终端设备类型是否与汇聚单元430指定的设备类型相匹配。举例来说，汇聚单元430需要指定位置信息(车库)下的某种终端设备类型(烟感器)能够在某个时间段(23:00～5:00)发送数据，通过同步终端设备410与汇聚单元430之间的时间，使终端设备410能够在汇聚单元430感兴趣的时间段上传数据。
作为一种可选的实施方式，物联网接入点420还用于，在其无线网络覆盖范围内周期性发送广播消息之前，调用时间接口，利用时间接口与时间服务器交互时间同步信号，获得与时间服务器之间的时间偏移量；
物联网接入点420还用于，根据时间偏移量，调整物联网接入点420的
时间，以实现与汇聚单元430之间的时间同步。
作为一种可选的实施方式，物联网接入点420还用于在其无线网络覆盖范围内周期性发送广播消息之前，调用时间接口，利用时间接口与时间服务器交互时间同步信号，获得与时间服务器之间的时间偏移量的方式具体为：
物联网接入点420还用于在其无线网络覆盖范围内周期性发送广播消息之前，调用时间接口，利用时间接口接收时间服务器在专用子载波信道上传输的第一时间同步信号，获得第一时间同步信号的第一到达时间；利用时间接口接收时间服务器在专用子载波信道上传输的第二时间同步信号，从第二时间同步信号中获取第一时间同步信号的第一发送时间；利用时间接口向时间服务器发送第三时间同步信号，并记录发送第三时间同步信号的第二发送时间；利用时间接口，接收时间服务器在专用子载波信道上传输的第四时间同步信号，从第四时间同步信号中获取第三时间同步信号的第二到达时间；根据第一到达时间、第一发送时间、第二发送时间和第二到达时间，获得与时间服务器之间的时间偏移量。
其中，在上述实施方式中，专用子载波信道可以在100MHz～1GHz之间以跳频方式选择，选择出100MHz～1GHz之间的一个子载波信道作为传输第一时间同步信号的专用子载波信道。另外，专用子载波信道也可以根据信道的质量选择信道质量较好的子载波信道作为专用子载波信道。
第二时间同步信号是第一时间同步信号的跟随信号，第二时间同步信号在第一时间同步信号发出之后发出，其中，第二时间同步信号包括第一时间同步信号的第一发送时间。第二时间同步信号可以调用与第一时间同步信号相同的专用子载波信道，也可以调用不同的专用子载波信道。如果是不同的专用子载波信道，可以采用与第一时间同步信号选择专用子载波信道的方法进行选择。
第三时间同步是在接收到第一时间同步信号后发出。可以理解，第三时间同步信号可以采用与第一时间同步信号相同的专用子载波信道、也可以采用与第一时间同步信号不同的专用子载波信道。
第四时间同步信号包括第三时间同步信号的第二到达时间。
实际情况下，从物联网接入点420到时间服务器之间，以及时间服务器到物联网接入点之间都存在着网络时延，但是由于这两种时延是双向的，符合均值为0，因此，物联网接入点420与时间服务器之间的时间偏移量如公式1：
时间偏移量＝【(第一到达时间-第一发送时间)-(第二到达时间-第二发送时间)】/2公式1
然后，物联网接入点420根据时间偏移量调整自身的时间，该时间与时间服务器同步。另外，汇聚单元430也将通过该种方式将时间调整到与时间服务器同步，从而实现物联网接入点420与汇聚单元430之间的时间同步。
第一发送时间、第一到达时间、第二发送时间和第二到达时间为(时，分，秒)对应的绝对时间。
通过实施图4所示的系统，在物联网接入点420与汇聚单元430时间同步的情况下，进一步基于物联网接入点420同步终端设备410与汇聚单元430之间的时间。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序可以存储于一计算机可读存储介质中，存储介质包括只读存储器(Read-Only Memory，ROM)、随机存储器(Random Access Memory，RAM)、可编程只读存储器(Programmable Read-only Memory，PROM)、可擦除可编程只读存储器(Erasable Programmable Read Only Memory，EPROM)、一次可编程只读存储器(One-time Programmable Read-Only Memory，OTPROM)、电子抹除式可复写只读存储器(Electrically-Erasable Programmable Read-Only Memory，EEPROM)、只读光盘(Compact Disc Read-Only Memory，CD-ROM)或其他光盘存储器、磁盘存储器、磁带存储器、或者能够用于携带或存储数据的计算机可读的任何其他介质。
以上对本发明实施例公开的一种物联网终端设备与汇聚单元的时间同步方法及系统进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。
Claims (10)
- 一种物联网终端设备与汇聚单元的时间同步方法，其特征在于，包括：物联网接入点在其无线网络覆盖范围内发送广播消息，所述广播消息包括所述物联网接入点发送所述广播消息的第一时间标签，所述物联网接入点与汇聚单元时间同步；所述物联网接入点接收终端设备对所述广播消息的响应消息，所述响应消息包括终端设备类型、所述第一时间标签、所述终端设备接收到所述广播消息的第二时间标签和所述终端设备发送所述响应消息的第三时间标签；所述物联网接入点判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配；如果匹配，所述物联网接入点根据所述第一时间标签、所述第二时间标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备；所述终端设备根据所述时间差，进行时间同步调整。
- 根据权利要求1所述的方法，其特征在于，所述响应消息还包括所述终端设备采用的时刻类型；所述物联网接入点根据所述第一时间标签、所述第二时间标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备，包括：所述物联网接入点判断其所采用的时刻类型与所述终端设备采用的时刻类型是否一致；如果一致，所述物联网接入点根据所述第一时间标签、所述第二时间标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备；如果不一致，所述物联网接入点将所述第一时间标签转换成所述终端设备采用的时刻类型对应的第五时间标签、以及将所述第四时间标签转换成所述终端设备采用的时刻类型对应的第六时间标签，根据所述第五时间标签、所述第六时间标签、所述第二时间标签和所述第三时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备。
- 根据权利要求1或2所述的方法，其特征在于，所述物联网接入点在 其无线网络覆盖范围内发送广播消息之前，所述方法还包括：所述物联网接入点调用时间接口，利用所述时间接口与时间服务器交互时间同步信号，获得与所述时间服务器之间的时间偏移量；所述物联网接入点根据所述时间偏移量，调整所述物联网接入点的时间，以实现与所述汇聚单元之间的时间同步。
- 根据权利要求3所述的方法，其特征在于，所述物联网接入点调用时间接口，利用所述时间接口与时间服务器交互时间同步信号，获得与所述时间服务器之间的时间偏移量，包括：所述物联网接入点调用时间接口，利用所述时间接口接收时间服务器在专用子载波信道上传输的第一时间同步信号，获得所述第一时间同步信号的第一到达时间；所述物联网接入点利用所述时间接口接收所述时间服务器在所述专用子载波信道上传输的第二时间同步信号，从所述第二时间同步信号中获取所述第一时间同步信号的第一发送时间；所述物联网接入点利用所述时间接口向所述时间服务器发送第三时间同步信号，并记录发送所述第三时间同步信号的第二发送时间；所述物联网接入点利用所述时间接口，接收所述时间服务器在所述专用子载波信道上传输的第四时间同步信号，从所述第四时间同步信号中获取所述第三时间同步信号的第二到达时间；所述物联网接入点根据第一到达时间、第一发送时间、第二发送时间和第二到达时间，获得与所述时间服务器之间的时间偏移量。
- 根据权利要求1所述的方法，其特征在于，所述响应消息还包括终端设备地址信息，所述物联网接入点接收终端设备对所述广播消息的响应消息之后，以及所述物联网接入点判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配之前，所述方法还包括：所述物联网接入点判断所述终端设备地址信息是否与所述汇聚单元指定的位置信息相匹配，如果匹配，所述物联网接入点执行判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配的步骤。
- 一种物联网终端设备与汇聚单元的时间同步系统，其特征在于，包括：终端设备，用于接收物联网接入点周期性发送的广播消息，以及发送针对所述广播消息的响应消息，所述广播消息包括所述物联网接入点发送所述广播消息的第一时间标签，所述响应消息包括终端设备类型、所述第一时间标签、所述终端设备接收到所述广播消息的第二时间标签和所述终端设备发送所述响应消息的第三时间标签；所述物联网接入点，用于在其无线网络覆盖范围内周期性发送所述广播消息，以及接收所述终端设备对所述广播消息的所述响应消息；所述物联网接入点与汇聚单元时间同步；所述物联网接入点还用于，判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配；所述物联网接入点还用于，根据所述第一时间标签、所述第二时间标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备；所述终端设备，用于根据所述时间差，进行时间同步调整。
- 根据权利要求6所述的系统，其特征在于，所述响应消息还包括所述终端设备采用的时刻类型；所述物联网接入点还用于根据所述第一时间标签、所述第二时间标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备的方式具体为：所述物联网接入点还用于，判断其所采用的时刻类型与所述终端设备采用的时刻类型是否一致；如果一致，根据所述第一时间标签、所述第二时间标签、所述第三时间标签和接收到所述响应消息的第四时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备；如果不一致，将所述第一时间标签转换成所述终端设备采用的时刻类型对应的第五时间标签、以及将所述第四时间标签转换成所述终端设备采用的时刻类型对应的第六时间标签，根据所述第五时间标签、所述第六时间标签、所述第二时间标签和所述第三时间标签，获得所述物联网接入点与所述终端设备之间的时间差并发送给所述终端设备。
- 根据权利要求6或7所述的系统，其特征在于：所述物联网接入点还用于，在其无线网络覆盖范围内周期性发送广播消息之前，调用时间接口，利用所述时间接口与时间服务器交互时间同步信号，获得与所述时间服务器之间的时间偏移量；所述物联网接入点还用于，根据所述时间偏移量，调整所述物联网接入点的时间，以实现与所述汇聚单元之间的时间同步。
- 根据权利要求8所述的系统，其特征在于，所述物联网接入点还用于在其无线网络覆盖范围内周期性发送广播消息之前，调用时间接口，利用所述时间接口与时间服务器交互时间同步信号，获得与所述时间服务器之间的时间偏移量的方式具体为：所述物联网接入点还用于在其无线网络覆盖范围内周期性发送广播消息之前，调用时间接口，利用所述时间接口接收时间服务器在专用子载波信道上传输的第一时间同步信号，获得所述第一时间同步信号的第一到达时间；利用所述时间接口接收所述时间服务器在所述专用子载波信道上传输的第二时间同步信号，从所述第二时间同步信号中获取所述第一时间同步信号的第一发送时间；利用所述时间接口向所述时间服务器发送第三时间同步信号，并记录发送所述第三时间同步信号的第二发送时间；利用所述时间接口，接收所述时间服务器在所述专用子载波信道上传输的第四时间同步信号，从所述第四时间同步信号中获取所述第三时间同步信号的第二到达时间；根据第一到达时间、第一发送时间、第二发送时间和第二到达时间，获得与所述时间服务器之间的时间偏移量。
- 根据权利要求6所述的系统，其特征在于，所述响应消息还包括终端设备地址信息，所述物联网接入点还用于在接收终端设备对所述广播消息的响应消息之后，以及判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配之前，判断所述终端设备地址信息是否与所述汇聚单元指定的位置信息相匹配，如果匹配，执行判断所述终端设备类型是否与所述汇聚单元指定的设备类型相匹配。
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710463177.9A CN107248895B (zh) | 2017-06-19 | 2017-06-19 | 一种物联网终端设备与汇聚单元的时间同步方法及系统 |
| CN201710463177.9 | 2017-06-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2018232971A1 true WO2018232971A1 (zh) | 2018-12-27 |
Family
ID=60019548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2017/098639 WO2018232971A1 (zh) | 2017-06-19 | 2017-08-23 | 一种物联网终端设备与汇聚单元的时间同步方法及系统 |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107248895B (zh) |
| WO (1) | WO2018232971A1 (zh) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109150359B (zh) * | 2018-09-30 | 2020-03-27 | 珠海格力电器股份有限公司 | 一种空调机组的时间同步方法及装置 |
| CN116545570B (zh) * | 2023-05-31 | 2024-03-29 | 烟台东方瑞创达电子科技有限公司 | 一种光纤授时系统的数据监控方法及系统 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102625428A (zh) * | 2012-04-24 | 2012-08-01 | 苏州摩多物联科技有限公司 | 无线传感器网络的时间同步方法 |
| CN103178917A (zh) * | 2011-12-26 | 2013-06-26 | 中国移动通信集团公司 | 一种协作通信的时钟同步方法、系统以及信息汇集节点 |
| CN103546868A (zh) * | 2012-07-12 | 2014-01-29 | 华为技术有限公司 | 一种无线传感器网络的时间同步方法、网络系统和节点 |
| US20140253388A1 (en) * | 2013-03-08 | 2014-09-11 | Qualcomm Incorporated | Synchronization of anchor units in a position location tracking system |
| CN105682216A (zh) * | 2016-03-23 | 2016-06-15 | 中国矿业大学 | 一种适用于复杂环境的无线传感器网络的时间同步方法 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244925B (zh) * | 2010-05-14 | 2014-05-07 | 华为技术有限公司 | 时钟同步方法、用户端设备和时钟同步系统 |
| CN102055800A (zh) * | 2010-12-13 | 2011-05-11 | 南京大学 | 基于信息汇聚的交通物联网分层体系架构 |
| CN102158876A (zh) * | 2010-12-30 | 2011-08-17 | 北京林业大学 | 一种基于物联网的监测方法及系统 |
| CN102118849B (zh) * | 2011-03-02 | 2014-04-02 | 重庆邮电大学 | 一种适用于无线传感器网络的时间同步方法 |
| KR101670522B1 (ko) * | 2011-05-13 | 2016-10-28 | 주식회사 케이티 | 사물 통신 시스템에서 시간 동기화 방법 |
| CN103457685B (zh) * | 2012-05-29 | 2015-09-09 | 中国科学院沈阳自动化研究所 | 基于预测补偿的工业无线网络高精度时间同步方法 |
| US9226253B2 (en) * | 2013-12-04 | 2015-12-29 | Mitsubishi Electric Research Laboratories, Inc. | Passive synchronization in wireless networks |
| CN105070052B (zh) * | 2015-07-17 | 2017-11-03 | 袁丽 | 用于智能交通监测的无线通信系统及方法 |
-
2017
- 2017-06-19 CN CN201710463177.9A patent/CN107248895B/zh active Active
- 2017-08-23 WO PCT/CN2017/098639 patent/WO2018232971A1/zh active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178917A (zh) * | 2011-12-26 | 2013-06-26 | 中国移动通信集团公司 | 一种协作通信的时钟同步方法、系统以及信息汇集节点 |
| CN102625428A (zh) * | 2012-04-24 | 2012-08-01 | 苏州摩多物联科技有限公司 | 无线传感器网络的时间同步方法 |
| CN103546868A (zh) * | 2012-07-12 | 2014-01-29 | 华为技术有限公司 | 一种无线传感器网络的时间同步方法、网络系统和节点 |
| US20140253388A1 (en) * | 2013-03-08 | 2014-09-11 | Qualcomm Incorporated | Synchronization of anchor units in a position location tracking system |
| CN105682216A (zh) * | 2016-03-23 | 2016-06-15 | 中国矿业大学 | 一种适用于复杂环境的无线传感器网络的时间同步方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107248895B (zh) | 2019-01-04 |
| CN107248895A (zh) | 2017-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11056109B2 (en) | Reference audio extraction device for use with network microphones with acoustic echo cancellation and beamforming | |
| WO2018232970A1 (zh) | 一种应用于物联网的终端设备状态检测方法及系统 | |
| WO2018233057A1 (zh) | 一种物联网无线信号调整方法及系统 | |
| WO2018233046A1 (zh) | 一种基于数据类型的通信控制方法及系统 | |
| CN107318168B (zh) | 一种控制物联网终端设备通信的方法及系统 | |
| US8169996B2 (en) | Synchronized beacon for network having multiple radios | |
| WO2018233045A1 (zh) | 一种物联网通信模式的切换控制方法及系统 | |
| CN110376551B (zh) | 一种基于声信号时频联合分布的tdoa定位方法 | |
| WO2018232971A1 (zh) | 一种物联网终端设备与汇聚单元的时间同步方法及系统 | |
| WO2018233020A1 (zh) | 一种基于物联网的数据封装方法及系统 | |
| CN111130680B (zh) | 一种同步物联网接入节点与汇聚单元时间的方法及系统 | |
| WO2018232973A1 (zh) | 一种物联网终端设备工作状态的控制方法及系统 | |
| WO2018232962A1 (zh) | 一种物联网接入节点网络覆盖范围的调整方法及系统 | |
| WO2018233036A1 (zh) | 一种物联网数据的上报控制方法及设备 | |
| CN103152789B (zh) | ISA100.11a和WIA-PA融合路由器及路由方法 | |
| WO2018233049A1 (zh) | 一种物联网数据通信方法及系统 | |
| WO2018233034A1 (zh) | 一种物联网数据的传输控制方法及系统 | |
| CN109951799B (zh) | 一种基于声音的物体落点定位方法 | |
| CN107197443A (zh) | 一种基于物联网的数据传输控制方法及系统 | |
| WO2018232961A1 (zh) | 一种结合汇聚单元信息的物联网路由表更新方法及系统 | |
| WO2018233042A1 (zh) | 一种基于地理位置和时间的数据上报方法及系统 | |
| CN106789268A (zh) | 一种网络音频传输方法和系统 | |
| WO2018232959A1 (zh) | 一种借助相邻节点控制终端设备升级的方法及转发节点 | |
| WO2018233006A1 (zh) | 一种基于场景信息的物联网数据智能过滤方法及系统 | |
| WO2018233021A1 (zh) | 一种控制物联网中数据封装的方法及系统 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 17914719 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 32PN | Ep: public notification in the ep bulletin as address of the adressee cannot be established |
Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205 DATED 15.05.2020) |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 17914719 Country of ref document: EP Kind code of ref document: A1 |