WO2018232972A1 - 一种同步物联网接入节点与汇聚单元时间的方法及系统 - Google Patents
一种同步物联网接入节点与汇聚单元时间的方法及系统 Download PDFInfo
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- the present invention relates to the field of Internet of Things technologies, and in particular, to a method and system for synchronizing time of an Internet of Things access node and a convergence unit.
- the Internet of Things digitizes and networks everything through sensors, radio frequency identification technology, positioning technology, etc., and achieves efficient information interaction between items, between objects and between people and the real environment.
- Time information is the basic parameter in the Internet of Things.
- applications of the Internet of Things such as state judgment of access nodes or IoT terminal devices, mutual cooperation of access nodes, data fusion of access nodes, etc., time precision Have higher requirements and can coordinate information collection tasks. Because time synchronization requirements are different in different applications, it is difficult to monitor and manage these devices. Therefore, time synchronization has become one of the important research topics of the Internet of Things.
- the embodiment of the invention discloses a method and a system for synchronizing the time of an IoT access node and a convergence unit, which are used for synchronizing the time between an access node and a convergence unit in the Internet of Things, and realizing effective management of the Internet of Things device.
- a first aspect of the present invention discloses a method for synchronizing an IoT access node and a convergence unit time, which may include:
- the access node periodically sends a first data packet to the filtering gateway, where the first data packet includes the access node address information and a first sending time point of the first data packet;
- the filtering gateway identifies that the first data packet is a priority forwarding data packet from a forwarding rule table sent by the aggregation unit, and the first The data packet is forwarded to the aggregation unit;
- the aggregation unit Receiving, by the aggregation unit, the first data packet, and returning a second data packet, where the second data packet includes the access node address information, the first sending time point, and the first data packet a receiving time point and a second sending time point of the second data packet;
- the filtering gateway identifies, from the forwarding rule table, that the second data packet is a priority forwarding data packet, and the second data packet is forwarded. Giving the access node;
- the time compensation value between the access node and the aggregation unit adjusts its own time according to the time compensation value.
- the sending, by the access node, the first data packet to the filtering gateway may include:
- the access node periodically acquires a device type of the terminal device in the coverage of the wireless network and a time period in which the terminal device uploads data;
- the access node sends a first data packet to the filtering gateway, where the first data packet includes a device type of the terminal device, a time period in which the terminal device uploads data, the access node address information, and the first The first transmission time point of a data packet;
- the filtering gateway identifies that the first data packet is a priority forwarding data packet from a forwarding rule table sent by the aggregation unit, and the first The data packet is forwarded to the aggregation unit, including:
- the filtering gateway identifies the forwarding rule table sent by the aggregation unit according to the access node address information, the device type of the terminal device, and the time period in which the terminal device uploads data. And the first data packet is preferentially forwarded, and the first data packet is forwarded to the aggregation unit.
- the filtering gateway is configured to: according to the access node address information included in the first data packet, a device type of the terminal device, and the terminal device The time period in which the data is uploaded, the first data packet is forwarded to the aggregation unit, and the first data packet is forwarded to the aggregation unit, and the method includes:
- the filtering gateway searches, from the forwarding rule table, a target forwarding associated with the access node address information included in the first data packet, the device type of the terminal device, and a time period in which the terminal device uploads data. And determining, by the priority, whether the target forwarding priority is the highest forwarding priority in the forwarding rule table, and if yes, forwarding the first data packet to the aggregation unit.
- the first data packet further includes a direction indication identifier
- the filtering gateway is configured according to the access node address information included in the first data packet. Identifying, by the forwarding rule table delivered by the aggregation unit, that the first data packet is a priority forwarding packet, and forwarding the first data packet to the aggregation unit includes:
- the filtering gateway identifies, according to the access node address information included in the first data packet, the first data packet from the forwarding rule table sent by the aggregation unit as a priority forwarding data packet, and according to the foregoing A direction indication identifier included in a data packet, the first data packet being forwarded to the aggregation unit.
- the second data packet further includes a direction indication identifier
- the filtering gateway is configured according to the access node address information included in the second data packet. Identifying, by the forwarding rule table, that the second data packet is a priority forwarding data packet, and forwarding the second data packet to the access node, including:
- the filtering gateway according to the access node address information included in the second data packet,
- the forwarding rule table identifies that the second data packet is a priority forwarding data packet, and forwards the second data packet to the access node according to the direction indication identifier included in the second data packet.
- a second aspect of the present invention discloses a system for synchronizing an IoT access node and a convergence unit time, which may include:
- An access node configured to periodically send a first data packet to the filtering gateway, where the first data packet includes the access node address information and a first sending time point of the first data packet;
- the filtering gateway is configured to identify, according to the access node address information that is included in the first data packet, that the first data packet is a priority forwarding packet, and the Transmitting the first data packet to the convergence unit;
- the aggregation unit is configured to receive the first data packet, and return a second data packet, where the second data packet includes the access node address information, the first sending time point, and the first data a first reception time point of the packet and a second transmission time point of the second data packet;
- the filtering gateway is further configured to: according to the access node address information included in the second data packet, identify, by using the forwarding rule table, that the second data packet is a priority forwarding data packet, where the Transmitting two data packets to the access node;
- the access node is further configured to receive the second data packet, according to the first sending time point, the first receiving time point, the second sending time point, and receiving the second receiving of the second data packet At a time point, a time compensation value between the access node and the aggregation unit is calculated, and the time of the time is adjusted according to the time compensation value.
- the manner in which the access node is configured to periodically send the first data packet to the filtering gateway is specifically:
- the access node is configured to periodically acquire a device type of a terminal device in a coverage area of the wireless network and a time period in which the terminal device uploads data;
- the access node is further configured to send a first data packet to the filtering gateway, where the first data packet includes a device type of the terminal device, a time period in which the terminal device uploads data, and the access node address information a first transmission time point of the first data packet;
- the filtering gateway is further configured to: according to the access node address information included in the first data packet, identify, in the forwarding rule table sent by the aggregation unit, that the first data packet is a priority forwarding data packet, and the The manner in which the first data packet is forwarded to the aggregation unit is specifically:
- the filtering gateway is further configured to: forward, according to the access node address information, the device type of the terminal device, and the time period in which the terminal device uploads data, the forwarding rule sent by the aggregation unit
- the table identifies that the first data packet is a priority forwarding data packet, and forwards the first data packet to the aggregation unit.
- the filtering gateway is further configured to: according to the access node address information included in the first data packet, a device type and a location of the terminal device The time period in which the terminal device uploads data is identified from the forwarding rule table sent by the aggregation unit.
- the method for forwarding the first data packet to the aggregation unit is as follows:
- the filtering gateway is further configured to: search, from the forwarding rule table, an access node address information included in the first data packet, a device type of the terminal device, and a time period in which the terminal device uploads data.
- the destination forwarding priority is determined, and it is determined whether the target forwarding priority is the highest forwarding priority in the forwarding rule table, and if yes, the first data packet is forwarded to the aggregation unit.
- the first data packet further includes a direction indication identifier, where the filtering gateway is configured to use the access node address included in the first data packet.
- the information that is sent from the forwarding rule table sent by the aggregation unit to the first data packet is a priority forwarding packet, and the manner of forwarding the first data packet to the aggregation unit is specifically:
- the filtering gateway is configured to identify, according to the access node address information that is included in the first data packet, that the first data packet is a priority forwarding data packet, and And indicating, by the first data packet, a direction indication identifier, and forwarding the first data packet to the convergence unit.
- the second data packet further includes a direction indication identifier
- the filtering gateway is further configured to use, according to the access node, the second data packet
- the address information is obtained from the forwarding rule table that the second data packet is preferentially forwarded, and the method for forwarding the second data packet to the access node is specifically:
- the filtering gateway is further configured to: according to the access node address information included in the second data packet, identify, by using the forwarding rule table, that the second data packet is a priority forwarding data packet, and according to the foregoing And indicating, by the second data packet, the second data packet is forwarded to the access node.
- the embodiment of the invention has the following beneficial effects:
- the access node periodically sends a first data packet to the filtering gateway, where the first data packet includes the access node address information and the first sending time point of the first data packet, and then the filtering gateway is configured according to the first data.
- the access node address information included in the packet is identified by the forwarding rule table sent by the aggregation unit, and the first data packet is forwarded to the aggregation unit, and the first data packet is forwarded to the aggregation unit, and the aggregation unit receives the first data packet.
- the filtering gateway determines, according to the access node address information included in the second data packet, that the second data packet is preferentially forwarded, and the second data packet is forwarded to the access node, and finally, the access node is configured according to the first sending time point, a receiving time point, a second sending time point, and a second receiving time point of receiving the second data packet, calculating a time compensation value between the access node and the convergence unit, according to Room compensation value to adjust its own time, so that time synchronization between the access node and aggregation means to facilitate the convergence unit managing the networked devices (including access nodes, terminals, etc.).
- 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 synchronizing an IoT access node and a convergence unit according to an embodiment of the present invention
- FIG. 3 is a schematic flowchart of another method for synchronizing time of an Internet of Things access node and a convergence unit according to an embodiment of the present invention
- FIG. 4 is a schematic structural diagram of a system for synchronizing an IoT access node and a convergence unit according to an embodiment of the present invention.
- the embodiment of the invention discloses a method for synchronizing the time of the IoT access node and the aggregation unit, which is used for synchronizing the time between the IoT access node and the aggregation unit, and is convenient for the aggregation unit to manage the IoT device, such as an access node.
- the embodiment of the invention accordingly discloses a system for synchronizing the time of the Internet of Things access node 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 node layer, and an aggregation layer according to functions.
- the terminal device layer may include a mass-scale terminal device, such as a hygrometer, a smoke sensor, a ventilation device, a rain sensor, an irrigation valve, etc.;
- the access node layer may include a large number of access nodes connected by the network, and the access node It can include devices such as routers, repeaters, and access points.
- the access node may use any standard networking protocol, and the access node may implement data parsing between different network standards;
- the aggregation layer may include a filtering gateway and a convergence unit, wherein the filtering gateway may Direct or indirect communication connection with each access node of the access node layer through the Internet (not shown in the figure);
- the aggregation unit can perform high-level management on each access node of the access node layer through the filtering gateway, thereby realizing data Transmission frequency, network topology and other networking functions;
- the aggregation unit can not only analyze and make decisions about IoT data generated by massive terminal devices, but also send commands to obtain information or configure terminal device parameters (data transmission at this time) Pointing to the terminal device;
- the aggregation unit can also introduce various services, from big data to social networks, and even from social tools "likes" to weather sharing.
- each access node can provide IoT data receiving and receiving services for a large number of terminal devices within its own wireless network coverage, wherein each access node has its own wireless network coverage.
- Each terminal device can have a built-in wireless communication module, which enables each access node to communicate wirelessly with each terminal device within its own wireless network coverage via 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 The frequency is 918MHz and the lower frequency 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.
- the communication frequency band of the wireless communication module can also be defined as conforming to the Japanese ARIB standard or Canada.
- the specification of the IC standard is not limited in the embodiment of the present invention.
- 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 synchronizing an IoT access node and a convergence unit according to an embodiment of the present invention
- a method for synchronizing an IoT access node and a convergence unit time Can include:
- the access node periodically sends a first data packet to the filtering gateway, where the first data packet includes the access node address information and a first sending time point of the first data packet.
- the access node address information may be a physical address corresponding to an application location where the access node is located, for example, an access node set in a parking lot, and the access node address information is a physical address where the parking lot is located. Alternatively, the access node address information may also be some that includes its coverage. The address of the physical address of an application site.
- the access node may select a dedicated subcarrier channel from the transmission frequency band, and then periodically send the first data packet to the filtering gateway by using the dedicated subcarrier channel.
- the access node may select a dedicated subcarrier channel from the transmission frequency band by using a frequency hopping manner, and then periodically send the first data packet to the filtering gateway by using the dedicated subcarrier channel.
- 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 data packet.
- 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 filtering gateway according to the access node address information included in the first data packet, identifies that the first data packet is a priority forwarding data packet, and forwards the first data packet to the convergence unit.
- the forwarding rule table includes an association relationship between the address information of the access node and the forwarding priority, and the forwarding priority is found according to the address information of the access node. If the forwarding priority is determined to be the highest forwarding priority in the forwarding rule table, That is, the first data packet is identified as a priority forwarding packet, and the first data packet is forwarded to the aggregation unit.
- the sending, by the access node, the first data packet to the filtering gateway periodically includes: the access node periodically acquires the device type of the terminal device in the coverage of the wireless network, and uploads the terminal device. The time period of the data; the access node sends the first data packet to the filtering gateway, where the first data packet includes the device type of the terminal device, the time period in which the terminal device uploads data, the access node address information, and the first sending of the first data packet. Time point.
- the access node address information is the same as the address information of the terminal device, or the access node address information includes the address information of the terminal device.
- the filtering gateway identifies, according to the access node address information included in the first data packet, that the first data packet is preferentially forwarded from the forwarding rule table sent by the aggregation unit, and forwards the first data packet to the first data packet.
- the aggregation unit includes: the filtering gateway identifies, according to the access node address information included in the first data packet, the device type of the terminal device, and the time period in which the terminal device uploads the data, the first data packet is identified in the forwarding rule table sent by the aggregation unit. The packet is forwarded preferentially, and the first packet is forwarded to the aggregation unit.
- the forwarding rule table includes the access node address information, the device type of the terminal device, the association between the time period in which the terminal device uploads data and the forwarding priority, and the device according to the access node address information and the terminal device.
- the time period in which the type and the terminal device upload data finds the target forwarding priority. If it is determined that the target forwarding priority is the highest forwarding priority in the forwarding rule table, that is, the first data packet is preferentially forwarded. Forward the first data packet to the aggregation unit.
- the aggregation unit receives the first data packet, and returns a second data packet, where the second data packet includes the access node address information, the first sending time point, the first receiving time point of the first data packet, and the second number. According to the second transmission time point of the packet;
- the convergence unit may select a dedicated subcarrier channel from the transmission frequency band, and then return the second data packet by using the dedicated subcarrier channel.
- the concentrating unit may select a dedicated subcarrier channel from the transmission frequency band by using a frequency hopping manner, and then return the second data packet by using the dedicated subcarrier channel.
- 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 second data packet.
- 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 filtering gateway identifies, according to the access node address information included in the second data packet, that the second data packet is preferentially forwarded from the forwarding rule table, and forwards the second data packet to the access node.
- the access node receives the second data packet, and calculates the access node and the aggregation unit according to the first sending time point, the first receiving time point, the second sending time point, and the second receiving time point of receiving the second data packet.
- the time compensation value between them adjusts the time according to the time compensation value.
- the time compensation value between the access node and the aggregation unit is as follows:
- Time compensation value between the access node and the aggregation unit [(first reception time point - first transmission time point) - (second reception time point - second transmission time point)] / 2;
- the access node adjusts its time according to the time compensation value, so that the access node time is synchronized with the aggregation unit.
- the clock of the aggregation unit is also used as the standard clock, and the clock of the access node is used as the clock to be adjusted.
- the first transmission time point, the first reception time point, the second transmission time point, and the second reception time point are absolute times corresponding to (hours, minutes, seconds).
- the access node periodically sends a first data packet to the filtering gateway, where the first data packet includes the access node address information and the first sending time point of the first data packet, and then the filtering gateway is configured according to the first data.
- the access node address information included in the packet is identified by the forwarding rule table sent by the aggregation unit, and the first data packet is forwarded to the aggregation unit, and the first data packet is forwarded to the aggregation unit, and the aggregation unit receives the first data packet.
- the filtering gateway determines, according to the access node address information included in the second data packet, that the second data packet is preferentially forwarded, and the second data packet is forwarded to the access node, and finally, the access node is configured according to the first sending time point, a receiving time point, a second sending time point, and a second receiving time point of receiving the second data packet, calculating a time compensation value between the access node and the convergence unit, according to Room compensation value to adjust its own time, so that time synchronization between the access node and aggregation means to facilitate the convergence unit managing the networked devices (including access nodes, terminals, etc.).
- FIG. 3 is another schematic flowchart of a method for synchronizing an IoT access node and a convergence unit according to an embodiment of the present invention.
- a synchronous IoT access node and a convergence unit time Methods can include:
- the access node periodically sends a first data packet to the filtering gateway, where the first data packet includes an access node address information, a direction indication identifier, and a first sending time point of the first data packet.
- the first data packet further includes a direction indication identifier, where the direction indication is used to indicate a transmission direction of the first data packet, where the transmission direction includes an access node-aggregation unit, a convergence unit-access node, and The direction indication identifier in the first data packet is used to indicate the transmission direction of the first data packet from the access node to the aggregation unit.
- the direction indication identifier is represented by a dedicated bit in the first data packet, and the transmission direction of the first data packet can be simply indicated.
- the filtering gateway identifies, according to the access node address information included in the first data packet, that the first data packet is a priority forwarding data packet, and the direction indication identifier that is included according to the first data packet, in the forwarding rule table sent by the aggregation unit. Transmitting the first data packet to the aggregation unit;
- the filtering gateway reads the direction indication identifier from the dedicated bit of the first data packet, identifies the transmission direction of the first data packet according to the direction indication identifier, and then sends the first data packet.
- the filtering gateway determines, according to the direction indication identifier included in the first data packet, the first data packet is forwarded to the aggregation unit, and the filtering gateway determines whether the workload of the aggregation unit exceeds a preset threshold, if not exceeded.
- the preset threshold is equal to or smaller than the preset threshold, and the first data packet is sent to the convergence unit according to the direction indication identifier included in the first data packet; if the preset threshold is exceeded, the workload of the convergence unit is waited for less than the preset
- the threshold is set, the first data packet is sent to the convergence unit according to the direction indication identifier included in the first data packet.
- the filtering gateway receives the load indication sent by the aggregation unit according to the direction indication identifier included in the first data packet, and before the first data packet is forwarded to the aggregation unit, the filtering gateway indicates that the workload of the aggregation unit is determined by the filtering gateway.
- the threshold value is exceeded, when the workload of the aggregation unit is lower than the threshold, the first data packet is sent to the aggregation unit according to the direction indication identifier included in the first data packet; and the filtering gateway indicates that the load unit indicates the work of the convergence unit.
- the first data packet is sent to the convergence unit according to the direction indication identifier included in the first data packet.
- the filtering gateway monitors the workload of the aggregation unit in real time, and can effectively control the workload of the aggregation unit, thereby avoiding data loss or causing the aggregation unit system to collapse due to excessive workload of the aggregation unit.
- the aggregation unit receives the first data packet, and returns a second data packet, where the second data packet includes the access node address information, the direction indication identifier, the first sending time point, the first receiving time point of the first data packet, and the first The second transmission time point of the second data packet;
- the second data packet further includes a direction indication identifier for indicating a transmission direction of the second data packet, and a direction indication identifier in the second data packet is used to indicate a transmission direction of the second data packet.
- Aggregation unit to the access node wherein, the direction indication identifier is represented by a dedicated bit in the second data packet, and the transmission direction of the second data packet can be simply indicated.
- the filtering gateway identifies, according to the access node address information included in the second data packet, the second data packet from the forwarding rule table as the priority forwarding data packet, and the second data according to the direction indication identifier included in the second data packet.
- the packet is forwarded to the access node;
- the filtering gateway reads the direction indication identifier from the dedicated bit of the second data packet, identifies the transmission direction of the second data packet according to the direction indication identifier, and then sends the second data packet.
- the access node receives the second data packet, and calculates the access node and the aggregation unit according to the first sending time point, the first receiving time point, the second sending time point, and the second receiving time point of receiving the second data packet.
- the time compensation value between them adjusts the time according to the time compensation value.
- the access node periodically sends a first data packet to the filtering gateway, where the first data packet includes the access node address information, the direction indication identifier, and the first sending time point of the first data packet, and then filters the gateway. And identifying, according to the access node address information included in the first data packet, the first data packet is preferentially forwarded by the forwarding rule table sent by the aggregation unit, and forwarding the first data packet according to the direction indication identifier of the first data packet After the first data packet is received by the convergence unit, the aggregation unit responds to the first data packet, and returns the address information including the access node, the direction indication identifier, the first sending time point, and the first receiving time point of the first data packet.
- the filtering gateway determines, according to the access node address information included in the second data packet, that the second data packet is preferentially forwarded, according to the direction of the second data packet. Instructing to forward the second data packet to the access node, and finally, the access node according to the first sending time point, the first receiving time point, and the second sending And a second receiving time point of receiving the second data packet, calculating a time compensation value between the access node and the aggregation unit, and adjusting its own time according to the time compensation value, thereby synchronizing the access node and the convergence unit Time, it is convenient for the aggregation unit to manage the IoT devices (including access nodes, terminal devices, etc.).
- FIG. 4 is a schematic structural diagram of a system for synchronizing an IoT access node and a convergence unit according to an embodiment of the present invention
- a system for synchronizing an IoT access node and a convergence unit time Can include:
- the access node 410 is configured to periodically send the first data packet to the filtering gateway 420, where the first data packet includes the access node address information and a first sending time point of the first data packet;
- the filtering gateway 420 is configured to: according to the access node address information included in the first data packet, identify, by the forwarding rule table sent by the aggregation unit 430, that the first data packet is a priority forwarding data packet, and forward the first data packet to the convergence.
- the aggregation unit 430 is configured to receive the first data packet, and return a second data packet, where the second data packet Including the access node address information, the first sending time point, the first receiving time point of the first data packet, and the second sending time point of the second data packet;
- the filtering gateway 420 is further configured to: according to the access node address information included in the second data packet, identify that the second data packet is preferentially forwarded from the forwarding rule table, and forward the second data packet to the access node 410;
- the access node 410 is further configured to receive the second data packet, and calculate the access node according to the first sending time point, the first receiving time point, the second sending time point, and the second receiving time point of receiving the second data packet.
- the time compensation value between the 410 and the convergence unit 430 adjusts its time according to the time compensation value.
- the access node 410 may select a dedicated subcarrier channel from the transmission frequency band, and then periodically transmit the first data packet to the filtering gateway by using the dedicated subcarrier channel.
- the access node 410 may select a dedicated subcarrier channel from the transmission frequency band by using a frequency hopping manner, and then periodically send the first data packet to the filtering gateway 420 by using the dedicated subcarrier channel.
- 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 data packet.
- 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 aggregation unit may select a dedicated subcarrier channel from the transmission band and then return the second data packet using the dedicated subcarrier channel.
- the aggregation unit 430 may select a dedicated subcarrier channel from the transmission frequency band by using a frequency hopping manner, and then return the second data packet by using the dedicated subcarrier channel.
- 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 second data packet.
- 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 time compensation value between the access node 410 and the aggregation unit 430 is as follows:
- Time compensation value between the access node and the aggregation unit [(first reception time point - first transmission time point) - (second reception time point - second transmission time point)] / 2;
- the access node 410 adjusts its time based on the time offset value such that the access node 410 time is synchronized with the aggregation unit 430.
- the clock of the aggregation unit 430 is also used as the standard clock, and the clock of the access node 410 is used as the clock to be adjusted.
- the first transmission time point, the first reception time point, the second transmission time point, and the second reception time point are absolute times corresponding to (hours, minutes, seconds).
- the manner in which the access node 410 is configured to periodically send the first data packet to the filtering gateway 420 is specifically:
- the access node 410 is configured to periodically acquire a device type of the terminal device 440 in the coverage of the wireless network and a time period in which the terminal device 440 uploads data;
- the access node 410 is further configured to send the first data packet to the filtering gateway 420, where the first data packet includes a device type of the terminal device 440, a time period in which the terminal device 440 uploads data, access node address information, and a first data packet. a transmission time point;
- the filtering gateway 420 is further configured to: according to the access node address information included in the first data packet, identify, by the forwarding rule table sent by the aggregation unit 430, that the first data packet is a priority forwarding data packet, and forward the first data packet to the convergence.
- the manner of unit 430 is specifically as follows:
- the filtering gateway 420 is further configured to identify the first one from the forwarding rule table sent by the aggregation unit 430 according to the access node address information included in the first data packet, the device type of the terminal device 440, and the time period in which the terminal device 440 uploads data.
- the data packet is forwarded by the data packet, and the first data packet is forwarded to the aggregation unit 430.
- the filtering gateway 420 is further configured to send the information from the aggregation unit 430 according to the access node address information included in the first data packet, the device type of the terminal device 440, and the time period in which the terminal device 440 uploads data.
- the forwarding rule table identifies that the first data packet is a priority forwarding packet, and the method for forwarding the first data packet to the aggregation unit 430 is specifically:
- the filtering gateway 420 is further configured to: find, from the forwarding rule table, a target forwarding priority associated with the access node address information included in the first data packet, the device type of the terminal device 440, and the time period in which the terminal device 440 uploads data, and determine Whether the target forwarding priority is the highest forwarding priority in the forwarding rule table, and if so, forwarding the first data packet to the aggregation unit 430.
- the first data packet further includes a direction indication identifier
- the filtering gateway 420 is configured to identify, according to the access node address information included in the first data packet, the forwarding rule table sent by the aggregation unit 430.
- the first data packet is a priority forwarding packet, and the manner of forwarding the first data packet to the convergence unit 430 is specifically:
- the filtering gateway 420 is configured to identify, according to the access node address information included in the first data packet, that the first data packet is preferentially forwarded by the forwarding rule table sent by the aggregation unit 430, and according to the direction included by the first data packet.
- the indication identifier is forwarded to the aggregation unit 430.
- the direction indication identifier is represented by a dedicated bit in the first data packet, and the transmission direction of the first data packet can be simply indicated.
- the filtering gateway 420 reads the direction indication identifier from the dedicated bit of the first data packet, identifies the transmission direction of the first data packet according to the direction indication identifier, and then transmits the first data packet.
- the filtering gateway 420 determines whether the workload of the convergence unit 430 exceeds a preset threshold according to the direction indication identifier included in the first data packet. If the preset threshold is not exceeded (equal to or less than the preset threshold) The first data packet is sent to the convergence unit 430 according to the direction indication identifier included in the first data packet; if the preset threshold is exceeded, when the workload of the convergence unit 430 is lower than the preset threshold, according to the first The direction indication identifier included in the data packet is sent to the aggregation unit 430.
- the filtering gateway 420 receives the load indication sent by the aggregation unit 430, and the filtering gateway 420 indicates that the load indication indicates When the workload of the aggregation unit 430 exceeds the threshold, when the workload of the aggregation unit 430 is lower than the threshold, the first data packet is sent to the convergence unit 430 according to the direction indication identifier included in the first data packet; the filtering gateway 420 is When the load indication indicates that the workload of the aggregation unit 430 does not exceed the threshold (equal to or less than the threshold), the first data packet is sent to the convergence unit 430 according to the direction indication identifier included in the first data packet.
- the filtering gateway 420 monitors the workload of the aggregation unit 430 in real time, and can effectively control the workload of the aggregation unit 430 to avoid data loss caused by the excessive workload of the aggregation unit 430 or cause the aggregation unit 430 to crash.
- the second data packet further includes a direction indication identifier
- the filtering gateway 420 is further configured to identify, according to the access node address information included in the second data packet, that the second data packet is
- the method of preferentially forwarding the data packet and forwarding the second data packet to the access node 410 is specifically:
- the filtering gateway 420 is further configured to: according to the access node address information included in the second data packet, identify, from the forwarding rule table, that the second data packet is a priority forwarding data packet, and according to the direction indication identifier included in the second data packet, The two data packets are forwarded to the access node 410.
- the second data packet further includes a direction indication identifier for indicating a transmission direction of the second data packet, and a direction indication identifier in the second data packet is used to indicate a transmission direction of the second data packet from the convergence unit 430 to the access node 410.
- the direction indication identifier is represented by a dedicated bit in the second data packet, and the transmission direction of the second data packet can be simply indicated.
- the access node 410 calculates the time compensation value between it and the aggregation unit 430, and adjusts its own time according to the time compensation value, thereby synchronizing the time between the access node 410 and the aggregation unit 430.
- the aggregation unit 430 is convenient for the IoT device (including the access node 410, the terminal device 440, etc.).
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- RAM Random Access Memory
- PROM Programmable Read-Only Memory
- EPROM Erasable Programmable Read Only Memory
- OTPROM One-time Programmable Read-Only Memory
- OTPROM Electronically-Erasable Programmable Read-Only Memory
- EEPROM Electrically-Erasable Programmable Read-Only Memory
- CD-ROM Compact Disc Read-Only Memory
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Abstract
本发明实施例涉及物联网技术领域，公开了一种同步物联网接入节点与汇聚单元时间的方法及系统，该方法包括：接入节点周期性向过滤网关发送第一数据包；过滤网关根据第一数据包包括的接入节点地址信息，将第一数据包转发给汇聚单元；汇聚单元接收第一数据包，并返回第二数据包；过滤网关根据第二数据包包括的接入节点地址信息，将第二数据包转发给接入节点；接入节点接收第二数据包，根据第一数据包的第一发送时间点、第一数据包的第一接收时间点、第二数据包的第二发送时间点和第二数据包的第二接收时间点，计算接入节点与汇聚单元之间的时间补偿值，根据时间补偿值调整自身的时间；用于同步物联网中接入节点与汇聚单元之间的时间。
Description
本发明涉及物联网技术领域，具体涉及一种同步物联网接入节点与汇聚单元时间的方法及系统。
物联网通过传感器、射频识别技术、定位技术等将一切事物数字化、网络化，在物品之间、物品与人之间、人与现实环境之间实现高效信息交互方式。时间信息是物联网中的基本参量，在物联网的很多应用中，例如接入节点或物联网终端设备的状态判断、接入节点的相互协同、接入节点的数据融合等，都对时间精度有较高要求，能够协同完成信息采集任务。由于不同应用中时间同步要求不一样，也使得监控、管理这些设备变得困难，因此，时间同步成为了物联网的重要研究课题之一。
发明内容
本发明实施例公开了一种同步物联网接入节点与汇聚单元时间的方法及系统，用于同步物联网中接入节点与汇聚单元之间的时间，实现对物联网设备的有效管理。
本发明第一方面公开了一种同步物联网接入节点与汇聚单元时间的方法，可包括：
接入节点周期性向过滤网关发送第一数据包，所述第一数据包包括所述接入节点地址信息和所述第一数据包的第一发送时间点；
所述过滤网关根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元；
所述汇聚单元接收所述第一数据包，并返回第二数据包，所述第二数据包包括所述接入节点地址信息、所述第一发送时间点、所述第一数据包的第一接收时间点和所述第二数据包的第二发送时间点；
所述过滤网关根据所述第二数据包包括的所述接入节点地址信息，从所述转发规则表中识别出所述第二数据包为优先转发数据包，将所述第二数据包转发给所述接入节点；
所述接入节点接收所述第二数据包，根据所述第一发送时间点、第一接收时间点、第二发送时间点和接收到所述第二数据包的第二接收时间点，计算所述接入节点与所述汇聚单元之间的时间补偿值，根据所述时间补偿值调整自身的时间。
作为一种可选的实施方式，在本发明第一方面中，所述接入节点周期性向过滤网关发送第一数据包，可包括：
所述接入节点周期性获取其无线网络覆盖范围内的终端设备的设备类型和所述终端设备上传数据的时间段；
所述接入节点向过滤网关发送第一数据包，所述第一数据包包括所述终端设备的设备类型、所述终端设备上传数据的时间段、所述接入节点地址信息和所述第一数据包的第一发送时间点；
所述过滤网关根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元，包括：
所述过滤网关根据所述第一数据包包括的所述接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元。
作为一种可选的实施方式，在本发明第一方面中，所述过滤网关根据所述第一数据包包括的所述接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元，包括：
所述过滤网关从所述转发规则表中查找出与所述第一数据包包括的接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段相关联的目标转发优先级，判断所述目标转发优先级是否为所述转发规则表中的最高转发优先级，如果是，将所述第一数据包转发给所述汇聚单元。
作为一种可选的实施方式，在本发明第一方面中，所述第一数据包还包括方向指示标识；所述过滤网关根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元包括：
所述过滤网关根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，以及根据所述第一数据包包括的方向指示标识，将所述第一数据包转发给所述汇聚单元。
作为一种可选的实施方式，在本发明第一方面中，所述第二数据包还包括方向指示标识，所述过滤网关根据所述第二数据包包括的所述接入节点地址信息，从所述转发规则表中识别出所述第二数据包为优先转发数据包，将所述第二数据包转发给所述接入节点，包括：
所述过滤网关根据所述第二数据包包括的所述接入节点地址信息，从所
述转发规则表中识别出所述第二数据包为优先转发数据包，以及根据所述第二数据包包括的方向指示标识，将所述第二数据包转发给所述接入节点。
本发明第二方面公开了一种同步物联网接入节点与汇聚单元时间的系统，可包括：
接入节点，用于周期性向过滤网关发送第一数据包，所述第一数据包包括所述接入节点地址信息和所述第一数据包的第一发送时间点；
所述过滤网关，用于根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元；
所述汇聚单元，用于接收所述第一数据包，并返回第二数据包，所述第二数据包包括所述接入节点地址信息、所述第一发送时间点、所述第一数据包的第一接收时间点和所述第二数据包的第二发送时间点；
所述过滤网关还用于，根据所述第二数据包包括的所述接入节点地址信息，从所述转发规则表中识别出所述第二数据包为优先转发数据包，将所述第二数据包转发给所述接入节点；
所述接入节点还用于，接收所述第二数据包，根据所述第一发送时间点、第一接收时间点、第二发送时间点和接收到所述第二数据包的第二接收时间点，计算所述接入节点与所述汇聚单元之间的时间补偿值，根据所述时间补偿值调整自身的时间。
作为一种可选的实施方式，在本发明第二方面中，所述接入节点用于周期性向过滤网关发送第一数据包的方式具体为：
所述接入节点用于周期性获取其无线网络覆盖范围内的终端设备的设备类型和所述终端设备上传数据的时间段；
所述接入节点还用于向过滤网关发送第一数据包，所述第一数据包包括所述终端设备的设备类型、所述终端设备上传数据的时间段、所述接入节点地址信息和所述第一数据包的第一发送时间点；
所述过滤网关还用于根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元的方式具体为：
所述过滤网关还用于根据所述第一数据包包括的所述接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元。
作为一种可选的实施方式，在本发明第二方面中，所述过滤网关还用于根据所述第一数据包包括的所述接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段，从汇聚单元下发的转发规则表中识别
出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元的方式具体为：
所述过滤网关还用于从所述转发规则表中查找出与所述第一数据包包括的接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段相关联的目标转发优先级，判断所述目标转发优先级是否为所述转发规则表中的最高转发优先级，如果是，将所述第一数据包转发给所述汇聚单元。
作为一种可选的实施方式，在本发明第二方面中，所述第一数据包还包括方向指示标识；所述过滤网关用于根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元的方式具体为：
所述过滤网关用于根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，以及根据所述第一数据包包括的方向指示标识，将所述第一数据包转发给所述汇聚单元。
作为一种可选的实施方式，在本发明第二方面中，所述第二数据包还包括方向指示标识，所述过滤网关还用于根据所述第二数据包包括的所述接入节点地址信息，从所述转发规则表中识别出所述第二数据包为优先转发数据包，将所述第二数据包转发给所述接入节点的方式具体为：
所述过滤网关还用于根据所述第二数据包包括的所述接入节点地址信息，从所述转发规则表中识别出所述第二数据包为优先转发数据包，以及根据所述第二数据包包括的方向指示标识，将所述第二数据包转发给所述接入节点。
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，接入节点周期性向过滤网关发送第一数据包，该第一数据包包括接入节点地址信息和第一数据包的第一发送时间点，然后过滤网关根据第一数据包包括的接入节点地址信息，从汇聚单元下发的转发规则表中识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元，汇聚单元接收第一数据包后，对第一数据包做出响应，返回包括接入节点地址信息、第一发送时间点、第一数据包的第一接收时间点和第二数据包的第二发送时间点的第二数据包，过滤网关根据第二数据包包括的接入节点地址信息，确定第二数据包为优先转发数据包，将第二数据包转发给接入节点，最后，接入节点根据第一发送时间点、第一接收时间点、第二发送时间点和接收第二数据包的第二接收时间点，计算接入节点与汇聚单元之间的时间补偿值，根据时间补偿值调整其自身的时间，从而同步接入节点与汇聚单元之间的时间，便于汇聚单元管理物联网设备(包括接入节点、终端设备等)。
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同步物联网接入节点与汇聚单元时间的方法的流程示意图；
图3为本发明实施例公开的同步物联网接入节点与汇聚单元时间的方法的另一流程示意图；
图4为本发明实施例公开的同步物联网接入节点与汇聚单元时间的系统的结构示意图。
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同步物联网接入节点与汇聚单元时间的方法，用于同步物联网接入节点与汇聚单元之间的时间，便于汇聚单元管理物联网设备，如接入节点。本发明实施例相应地公开了一种同步物联网接入节点与汇聚单元时间的系统。
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、接入节点层以及汇聚层三个层。其中，终端设备层可以包括海量规模的终端设备，例如湿度计、烟感器、通风设备、雨量传感器、灌溉阀等等；接入节点层可以包括网络连接的大量的接入节点，接入节点可以包括路由器、中继器、接入点等设备，
本发明实施例不作限定；接入节点可以使用任何标准的组网协议，而且接入节点可以在不同的网络制式之间实现数据解析；汇聚层可以包括过滤网关和汇聚单元，其中，过滤网关可以通过互联网与接入节点层的各个接入节点直接或间接通讯连接(在图中未全部示出)；汇聚单元可以通过过滤网关对接入节点层的各个接入节点进行高层管理，从而实现数据传输频率、网络拓扑以及其他组网功能的控制；汇聚单元不仅可以对海量终端设备产生的物联网数据进行分析和决策，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。在图1所示的物联网架构中，每一个接入节点可以为其自身无线网络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，每一个接入节点自身无线网络覆盖范围内的每一个终端设备可以内置有无线通讯模块，这使得每一个接入节点可以通过无线网络通讯方式与自身无线网络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。
基于图1所示的物联网架构，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同步物联网接入节点与汇聚单元时间的方法的流程示意图；如图2所示，一种同步物联网接入节点与汇聚单元时间的方法可包括：
201、接入节点周期性向过滤网关发送第一数据包，该第一数据包包括接入节点地址信息和第一数据包的第一发送时间点；
其中，接入节点地址信息可以为接入节点所在的某一个应用场所对应的物理地址，比如设置在某个停车场中的接入节点，接入节点地址信息为该停车场所在的物理地址。或者，接入节点地址信息还可以是包括了其覆盖的某
一个应用场所物理地址的地址。
作为一种可选的实施方式，接入节点可以从传输频段中选择专用子载波信道，然后周期性地采用专用子载波信道向过滤网关发送第一数据包。
进一步地，接入节点可以采用跳频方式从传输频段中选择专用子载波信道，然后周期性地采用专用子载波信道向过滤网关发送第一数据包。
举例来说，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发送第一数据包的专用子载波信道。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。
202、过滤网关根据第一数据包包括的接入节点地址信息，从汇聚单元下发的转发规则表中识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元；
转发规则表中包括接入节点地址信息与转发优先级的关联关系，根据接入节点地址信息查找到转发优先级，如果确定出该转发优先级为转发规则表中的最高转发优先级时，也就是识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元。
作为一种可选的实施方式，在步骤201中，接入节点周期性向过滤网关发送第一数据包包括：接入节点周期性获取其无线网络覆盖范围内的终端设备的设备类型和终端设备上传数据的时间段；接入节点向过滤网关发送第一数据包，第一数据包包括终端设备的设备类型、终端设备上传数据的时间段、接入节点地址信息和第一数据包的第一发送时间点。在该实施方式中，接入节点地址信息与终端设备的地址信息相同，或者接入节点地址信息包括终端设备的地址信息在内。
进而，在步骤202中过滤网关根据第一数据包包括的接入节点地址信息，从汇聚单元下发的转发规则表中识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元包括：过滤网关根据第一数据包包括的接入节点地址信息、终端设备的设备类型和终端设备上传数据的时间段，从汇聚单元下发的转发规则表中识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元。在该实施方式中，转发规则表中包括了接入节点地址信息、终端设备的设备类型、终端设备上传数据的时间段与转发优先级的关联关系，根据接入节点地址信息、终端设备的设备类型、终端设备上传数据的时间段查找到目标转发优先级，如果确定出该目标转发优先级为转发规则表中的最高转发优先级时，也就是识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元。
203、汇聚单元接收第一数据包，并返回第二数据包，第二数据包包括接入节点地址信息、第一发送时间点、第一数据包的第一接收时间点和第二数
据包的第二发送时间点；
作为一种可选的实施方式，汇聚单元可以从传输频段中选择专用子载波信道，然后采用专用子载波信道返回第二数据包。
进一步地，汇聚单元可以采用跳频方式从传输频段中选择专用子载波信道，然后采用专用子载波信道返回第二数据包。
举例来说，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发送第二数据包的专用子载波信道。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。
204、过滤网关根据第二数据包包括的接入节点地址信息，从转发规则表中识别出第二数据包为优先转发数据包，将第二数据包转发给接入节点；
205、接入节点接收第二数据包，根据第一发送时间点、第一接收时间点、第二发送时间点和接收到第二数据包的第二接收时间点，计算接入节点与汇聚单元之间的时间补偿值，根据时间补偿值调整自身的时间。
实际情况下，从接入节点到汇聚单元之间，以及汇聚单元到接入节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，接入节点与汇聚单元之间的时间补偿值如下公式所示：
接入节点与汇聚单元之间的时间补偿值＝【(第一接收时间点-第一发送时间点)-(第二接收时间点-第二发送时间点)】/2；
接入节点根据时间补偿值调整自身的时间，使得接入节点时间与汇聚单元同步。在本发明实施例中，也以汇聚单元的时钟作为标准时钟，接入节点的时钟作为待调整时钟。
第一发送时间点、第一接收时间点、第二发送时间点和第二接收时间点为(时，分，秒)对应的绝对时间。
在本发明实施例中，接入节点周期性向过滤网关发送第一数据包，该第一数据包包括接入节点地址信息和第一数据包的第一发送时间点，然后过滤网关根据第一数据包包括的接入节点地址信息，从汇聚单元下发的转发规则表中识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元，汇聚单元接收第一数据包后，对第一数据包做出响应，返回包括接入节点地址信息、第一发送时间点、第一数据包的第一接收时间点和第二数据包的第二发送时间点的第二数据包，过滤网关根据第二数据包包括的接入节点地址信息，确定第二数据包为优先转发数据包，将第二数据包转发给接入节点，最后，接入节点根据第一发送时间点、第一接收时间点、第二发送时间点和接收第二数据包的第二接收时间点，计算接入节点与汇聚单元之间的时间补偿值，根据时间补偿值调整其自身的时间，从而同步接入节点与汇聚单元之间的时间，便于汇聚单元管理物联网设备(包括接入节点、终端设备等)。
实施例二
请参阅图3，图3为本发明实施例公开的同步物联网接入节点与汇聚单元时间的方法的另一流程示意图；如图3所示，一种同步物联网接入节点与汇聚单元时间的方法可包括：
301、接入节点周期性向过滤网关发送第一数据包，该第一数据包包括接入节点地址信息、方向指示标识和第一数据包的第一发送时间点；
在该实施例中，第一数据包还包括方向指示标识，该方向指示标识用于指示该第一数据包的传输方向，传输方向包括接入节点-汇聚单元、汇聚单元-接入节点，而第一数据包中的方向指示标识是用于指示第一数据包的传输方向从接入节点到汇聚单元。
其中，方向指示标识采用第一数据包中的专用比特位表示，可以简单地指示出第一数据包的传输方向。
302、过滤网关根据第一数据包包括的接入节点地址信息，从汇聚单元下发的转发规则表中识别出第一数据包为优先转发数据包，以及根据第一数据包包括的方向指示标识，将第一数据包转发给汇聚单元；
过滤网关从第一数据包的专用比特位中读取方向指示标识，根据方向指示标识识别出第一数据包的传输方向，然后将第一数据包发送出去。
作为一种可选的实施方式，过滤网关根据第一数据包包括的方向指示标识，将第一数据包转发给汇聚单元之前，过滤网关判断汇聚单元的工作负荷是否超过预设阈值，如果未超过预设阈值(等于或者小于预设阈值)，根据第一数据包包括的方向指示标识，将第一数据包发送给汇聚单元；如果超过预设阈值，则等待汇聚单元的工作负荷低于该预设阈值时，根据第一数据包包括的方向指示标识，将第一数据包发送给汇聚单元。
进一步地，过滤网关根据第一数据包包括的方向指示标识，将第一数据包转发给汇聚单元之前，过滤网关接收汇聚单元发送的负荷指示，过滤网关在确定负荷指示表明了汇聚单元的工作负荷超过阈值时，则等待汇聚单元的工作负荷低于该阈值时，根据第一数据包包括的方向指示标识，将第一数据包发送给汇聚单元；过滤网关在确定负荷指示表明了汇聚单元的工作负荷未超过阈值(等于或者小于阈值)时，根据第一数据包包括的方向指示标识，将第一数据包发送给汇聚单元。
在上述实施方式中，过滤网关实时监控汇聚单元的工作负荷，能够有效控制汇聚单元的工作负荷，避免因汇聚单元的工作负荷过大时造成数据丢失或者造成汇聚单元系统崩溃。
303、汇聚单元接收第一数据包，并返回第二数据包，第二数据包包括接入节点地址信息、方向指示标识、第一发送时间点、第一数据包的第一接收时间点和第二数据包的第二发送时间点；
同样，第二数据包还包括方向指示标识，该方向指示标识用于指示该第二数据包的传输方向，而第二数据包中的方向指示标识是用于指示第二数据包的传输方向从汇聚单元到接入节点。其中，方向指示标识采用第二数据包中的专用比特位表示，可以简单地指示出第二数据包的传输方向。
304、过滤网关根据第二数据包包括的接入节点地址信息，从转发规则表中识别出第二数据包为优先转发数据包，以及根据第二数据包包括的方向指示标识，将第二数据包转发给接入节点；
过滤网关从第二数据包的专用比特位中读取方向指示标识，根据方向指示标识识别出第二数据包的传输方向，然后将第二数据包发送出去。
305、接入节点接收第二数据包，根据第一发送时间点、第一接收时间点、第二发送时间点和接收到第二数据包的第二接收时间点，计算接入节点与汇聚单元之间的时间补偿值，根据时间补偿值调整自身的时间。
在本发明实施例中，接入节点周期性向过滤网关发送第一数据包，该第一数据包包括接入节点地址信息、方向指示标识和第一数据包的第一发送时间点，然后过滤网关根据第一数据包包括的接入节点地址信息，从汇聚单元下发的转发规则表中识别出第一数据包为优先转发数据包，根据第一数据包的方向指示标识将第一数据包转发给汇聚单元，汇聚单元接收第一数据包后，对第一数据包做出响应，返回包括接入节点地址信息、方向指示标识、第一发送时间点、第一数据包的第一接收时间点和第二数据包的第二发送时间点的第二数据包，过滤网关根据第二数据包包括的接入节点地址信息，确定第二数据包为优先转发数据包，根据第二数据包的方向指示标识将第二数据包转发给接入节点，最后，接入节点根据第一发送时间点、第一接收时间点、第二发送时间点和接收第二数据包的第二接收时间点，计算接入节点与汇聚单元之间的时间补偿值，根据时间补偿值调整其自身的时间，从而同步接入节点与汇聚单元之间的时间，便于汇聚单元管理物联网设备(包括接入节点、终端设备等)。
实施例三
请参阅图4，图4为本发明实施例公开的同步物联网接入节点与汇聚单元时间的系统的结构示意图；如图4所示，一种同步物联网接入节点与汇聚单元时间的系统可包括：
接入节点410，用于周期性向过滤网关420发送第一数据包，第一数据包包括接入节点地址信息和第一数据包的第一发送时间点；
过滤网关420，用于根据第一数据包包括的接入节点地址信息，从汇聚单元430下发的转发规则表中识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元430；
汇聚单元430，用于接收第一数据包，并返回第二数据包，第二数据包
包括接入节点地址信息、第一发送时间点、第一数据包的第一接收时间点和第二数据包的第二发送时间点；
过滤网关420还用于，根据第二数据包包括的接入节点地址信息，从转发规则表中识别出第二数据包为优先转发数据包，将第二数据包转发给接入节点410；
接入节点410还用于，接收第二数据包，根据第一发送时间点、第一接收时间点、第二发送时间点和接收到第二数据包的第二接收时间点，计算接入节点410与汇聚单元430之间的时间补偿值，根据时间补偿值调整自身的时间。
作为一种可选的实施方式，接入节点410可以从传输频段中选择专用子载波信道，然后周期性地采用专用子载波信道向过滤网关发送第一数据包。
进一步地，接入节点410可以采用跳频方式从传输频段中选择专用子载波信道，然后周期性地采用专用子载波信道向过滤网关420发送第一数据包。
举例来说，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发送第一数据包的专用子载波信道。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。
同样，汇聚单元可以从传输频段中选择专用子载波信道，然后采用专用子载波信道返回第二数据包。
进一步地，汇聚单元430可以采用跳频方式从传输频段中选择专用子载波信道，然后采用专用子载波信道返回第二数据包。
举例来说，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发送第二数据包的专用子载波信道。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。
实际情况下，从接入节点410到汇聚单元430之间，以及汇聚单元430到接入节点410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，接入节点410与汇聚单元430之间的时间补偿值如下公式所示：
接入节点与汇聚单元之间的时间补偿值＝【(第一接收时间点-第一发送时间点)-(第二接收时间点-第二发送时间点)】/2；
接入节点410根据时间补偿值调整自身的时间，使得接入节点410时间与汇聚单元430同步。在本发明实施例中，也以汇聚单元430的时钟作为标准时钟，接入节点410的时钟作为待调整时钟。
第一发送时间点、第一接收时间点、第二发送时间点和第二接收时间点为(时，分，秒)对应的绝对时间。
作为一种可选的实施方式，接入节点410用于周期性向过滤网关420发送第一数据包的方式具体为：
接入节点410用于周期性获取其无线网络覆盖范围内的终端设备440的设备类型和终端设备440上传数据的时间段；
接入节点410还用于向过滤网关420发送第一数据包，第一数据包包括终端设备440的设备类型、终端设备440上传数据的时间段、接入节点地址信息和第一数据包的第一发送时间点；
过滤网关420还用于根据第一数据包包括的接入节点地址信息，从汇聚单元430下发的转发规则表中识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元430的方式具体为：
过滤网关420还用于根据第一数据包包括的接入节点地址信息、终端设备440的设备类型和终端设备440上传数据的时间段，从汇聚单元430下发的转发规则表中识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元430。
作为一种可选的实施方式，过滤网关420还用于根据第一数据包包括的接入节点地址信息、终端设备440的设备类型和终端设备440上传数据的时间段，从汇聚单元430下发的转发规则表中识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元430的方式具体为：
过滤网关420还用于从转发规则表中查找出与第一数据包包括的接入节点地址信息、终端设备440的设备类型和终端设备440上传数据的时间段相关联的目标转发优先级，判断目标转发优先级是否为转发规则表中的最高转发优先级，如果是，将第一数据包转发给汇聚单元430。
作为一种可选的实施方式，第一数据包还包括方向指示标识；过滤网关420用于根据第一数据包包括的接入节点地址信息，从汇聚单元430下发的转发规则表中识别出第一数据包为优先转发数据包，将第一数据包转发给汇聚单元430的方式具体为：
过滤网关420用于根据第一数据包包括的接入节点地址信息，从汇聚单元430下发的转发规则表中识别出第一数据包为优先转发数据包，以及根据第一数据包包括的方向指示标识，将第一数据包转发给汇聚单元430。
方向指示标识采用第一数据包中的专用比特位表示，可以简单地指示出第一数据包的传输方向。过滤网关420从第一数据包的专用比特位中读取方向指示标识，根据方向指示标识识别出第一数据包的传输方向，然后将第一数据包发送出去。
作为一种可选的实施方式，过滤网关420根据第一数据包包括的方向指示标识，将第一数据包转发给汇聚单元430之前，过滤网关420判断汇聚单元430的工作负荷是否超过预设阈值，如果未超过预设阈值(等于或者小于预设阈
值)，根据第一数据包包括的方向指示标识，将第一数据包发送给汇聚单元430；如果超过预设阈值，则等待汇聚单元430的工作负荷低于该预设阈值时，根据第一数据包包括的方向指示标识，将第一数据包发送给汇聚单元430。
进一步地，过滤网关420根据第一数据包包括的方向指示标识，将第一数据包转发给汇聚单元430之前，过滤网关420接收汇聚单元430发送的负荷指示，过滤网关420在确定负荷指示表明了汇聚单元430的工作负荷超过阈值时，则等待汇聚单元430的工作负荷低于该阈值时，根据第一数据包包括的方向指示标识，将第一数据包发送给汇聚单元430；过滤网关420在确定负荷指示表明了汇聚单元430的工作负荷未超过阈值(等于或者小于阈值)时，根据第一数据包包括的方向指示标识，将第一数据包发送给汇聚单元430。
在上述实施方式中，过滤网关420实时监控汇聚单元430的工作负荷，能够有效控制汇聚单元430的工作负荷，避免因汇聚单元430的工作负荷过大时造成数据丢失或者造成汇聚单元430系统崩溃。
作为一种可选的实施方式，第二数据包还包括方向指示标识，过滤网关420还用于根据第二数据包包括的接入节点地址信息，从转发规则表中识别出第二数据包为优先转发数据包，将第二数据包转发给接入节点410的方式具体为：
过滤网关420还用于根据第二数据包包括的接入节点地址信息，从转发规则表中识别出第二数据包为优先转发数据包，以及根据第二数据包包括的方向指示标识，将第二数据包转发给接入节点410。
第二数据包还包括方向指示标识，该方向指示标识用于指示该第二数据包的传输方向，而第二数据包中的方向指示标识是用于指示第二数据包的传输方向从汇聚单元430到接入节点410。其中，方向指示标识采用第二数据包中的专用比特位表示，可以简单地指示出第二数据包的传输方向。
通过实施图4所示的系统，接入节点410计算其与汇聚单元430之间的时间补偿值，根据时间补偿值调整其自身的时间，从而同步接入节点410与汇聚单元430之间的时间，便于汇聚单元430管理物联网设备(包括接入节点410、终端设备440等)。
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同步物联网接入节点与汇聚单元时间的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)
- 一种同步物联网接入节点与汇聚单元时间的方法，其特征在于，包括：接入节点周期性向过滤网关发送第一数据包，所述第一数据包包括所述接入节点地址信息和所述第一数据包的第一发送时间点；所述过滤网关根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元；所述汇聚单元接收所述第一数据包，并返回第二数据包，所述第二数据包包括所述接入节点地址信息、所述第一发送时间点、所述第一数据包的第一接收时间点和所述第二数据包的第二发送时间点；所述过滤网关根据所述第二数据包包括的所述接入节点地址信息，从所述转发规则表中识别出所述第二数据包为优先转发数据包，将所述第二数据包转发给所述接入节点；所述接入节点接收所述第二数据包，根据所述第一发送时间点、第一接收时间点、第二发送时间点和接收到所述第二数据包的第二接收时间点，计算所述接入节点与所述汇聚单元之间的时间补偿值，根据所述时间补偿值调整自身的时间。
- 根据权利要求1所述的方法，其特征在于，所述接入节点周期性向过滤网关发送第一数据包，包括：所述接入节点周期性获取其无线网络覆盖范围内的终端设备的设备类型和所述终端设备上传数据的时间段；所述接入节点向过滤网关发送第一数据包，所述第一数据包包括所述终端设备的设备类型、所述终端设备上传数据的时间段、所述接入节点地址信息和所述第一数据包的第一发送时间点；所述过滤网关根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元，包括：所述过滤网关根据所述第一数据包包括的所述接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包 转发给所述汇聚单元。
- 根据权利要求2所述的方法，其特征在于，所述过滤网关根据所述第一数据包包括的所述接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元，包括：所述过滤网关从所述转发规则表中查找出与所述第一数据包包括的接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段相关联的目标转发优先级，判断所述目标转发优先级是否为所述转发规则表中的最高转发优先级，如果是，将所述第一数据包转发给所述汇聚单元。
- 根据权利要求1所述的方法，其特征在于，所述第一数据包还包括方向指示标识；所述过滤网关根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元包括：所述过滤网关根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，以及根据所述第一数据包包括的方向指示标识，将所述第一数据包转发给所述汇聚单元。
- 根据权利要求1所述的方法，其特征在于，所述第二数据包还包括方向指示标识，所述过滤网关根据所述第二数据包包括的所述接入节点地址信息，从所述转发规则表中识别出所述第二数据包为优先转发数据包，将所述第二数据包转发给所述接入节点，包括：所述过滤网关根据所述第二数据包包括的所述接入节点地址信息，从所述转发规则表中识别出所述第二数据包为优先转发数据包，以及根据所述第二数据包包括的方向指示标识，将所述第二数据包转发给所述接入节点。
- 一种同步物联网接入节点与汇聚单元时间的系统，其特征在于，包括：接入节点，用于周期性向过滤网关发送第一数据包，所述第一数据包包括所述接入节点地址信息和所述第一数据包的第一发送时间点；所述过滤网关，用于根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包， 将所述第一数据包转发给所述汇聚单元；所述汇聚单元，用于接收所述第一数据包，并返回第二数据包，所述第二数据包包括所述接入节点地址信息、所述第一发送时间点、所述第一数据包的第一接收时间点和所述第二数据包的第二发送时间点；所述过滤网关还用于，根据所述第二数据包包括的所述接入节点地址信息，从所述转发规则表中识别出所述第二数据包为优先转发数据包，将所述第二数据包转发给所述接入节点；所述接入节点还用于，接收所述第二数据包，根据所述第一发送时间点、第一接收时间点、第二发送时间点和接收到所述第二数据包的第二接收时间点，计算所述接入节点与所述汇聚单元之间的时间补偿值，根据所述时间补偿值调整自身的时间。
- 根据权利要求6所述的系统，其特征在于，所述接入节点用于周期性向过滤网关发送第一数据包的方式具体为：所述接入节点用于周期性获取其无线网络覆盖范围内的终端设备的设备类型和所述终端设备上传数据的时间段；所述接入节点还用于向过滤网关发送第一数据包，所述第一数据包包括所述终端设备的设备类型、所述终端设备上传数据的时间段、所述接入节点地址信息和所述第一数据包的第一发送时间点；所述过滤网关还用于根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元的方式具体为：所述过滤网关还用于根据所述第一数据包包括的所述接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元。
- 根据权利要求7所述的系统，其特征在于，所述过滤网关还用于根据所述第一数据包包括的所述接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元的 方式具体为：所述过滤网关还用于从所述转发规则表中查找出与所述第一数据包包括的接入节点地址信息、所述终端设备的设备类型和所述终端设备上传数据的时间段相关联的目标转发优先级，判断所述目标转发优先级是否为所述转发规则表中的最高转发优先级，如果是，将所述第一数据包转发给所述汇聚单元。
- 根据权利要求6所述的系统，其特征在于，所述第一数据包还包括方向指示标识；所述过滤网关用于根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，将所述第一数据包转发给所述汇聚单元的方式具体为：所述过滤网关用于根据所述第一数据包包括的所述接入节点地址信息，从汇聚单元下发的转发规则表中识别出所述第一数据包为优先转发数据包，以及根据所述第一数据包包括的方向指示标识，将所述第一数据包转发给所述汇聚单元。
- 根据权利要求6所述的系统，其特征在于，所述第二数据包还包括方向指示标识，所述过滤网关还用于根据所述第二数据包包括的所述接入节点地址信息，从所述转发规则表中识别出所述第二数据包为优先转发数据包，将所述第二数据包转发给所述接入节点的方式具体为：所述过滤网关还用于根据所述第二数据包包括的所述接入节点地址信息，从所述转发规则表中识别出所述第二数据包为优先转发数据包，以及根据所述第二数据包包括的方向指示标识，将所述第二数据包转发给所述接入节点。
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| CN103686756B (zh) * | 2012-09-17 | 2016-12-21 | 中国科学院沈阳自动化研究所 | 一种基于多接入点的tdma接入装置及其接入方法 |
| CN103916427B (zh) * | 2012-12-31 | 2017-06-20 | 中国移动通信集团广东有限公司 | 第一移动通信终端及通信方法、物联网系统 |
| CN103327605B (zh) * | 2013-05-31 | 2015-12-23 | 武汉理工大学 | 物联网环境下基于令牌环的射频定位方法及系统 |
| CN103763395B (zh) * | 2014-02-10 | 2018-01-05 | 安徽皖通邮电股份有限公司 | 连接物联网管理平台与终端设备的中间件及其工作方法 |
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| US9503969B1 (en) * | 2015-08-25 | 2016-11-22 | Afero, Inc. | Apparatus and method for a dynamic scan interval for a wireless device |
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| 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 |
| CN106254021A (zh) * | 2016-07-18 | 2016-12-21 | 自连电子科技（上海）有限公司 | 实现物联网设备间时间同步的系统及其方法 |
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| CN107302575B (zh) | 2020-02-18 |
| CN111130680A (zh) | 2020-05-08 |
| CN107302575A (zh) | 2017-10-27 |
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