CN111130680B - Method and system for synchronizing time of access node and aggregation unit of Internet of things - Google Patents

Method and system for synchronizing time of access node and aggregation unit of Internet of things Download PDF

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CN111130680B
CN111130680B CN201911320704.6A CN201911320704A CN111130680B CN 111130680 B CN111130680 B CN 111130680B CN 201911320704 A CN201911320704 A CN 201911320704A CN 111130680 B CN111130680 B CN 111130680B
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data packet
access node
forwarding
address information
time point
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CN111130680A (en
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杜光东
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Shenzhen Shenglu IoT Communication Technology Co Ltd
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Shenzhen Shenglu IoT Communication Technology Co Ltd
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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
    • 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

Abstract

The embodiment of the invention relates to the technical field of Internet of things, and discloses a method and a system for synchronizing time of an access node and a convergence unit of the Internet of things, wherein the method comprises the following steps: the access node periodically sends a first data packet to the filtering gateway; the filtering gateway forwards the first data packet to the aggregation unit according to the access node address information included in the first data packet; the aggregation unit receives the first data packet and returns a second data packet; the filtering gateway forwards the second data packet to the access node according to the address information of the access node included in the second data packet; the access node receives the second data packet, calculates a time compensation value between the access node and the convergence unit according to a first sending time point of the first data packet, a first receiving time point of the first data packet, a second sending time point of the second data packet and a second receiving time point of the second data packet, and adjusts the time of the access node and the convergence unit according to the time compensation value; the method is used for synchronizing the time between the access node and the aggregation unit in the Internet of things.

Description

Method and system for synchronizing time of access node and aggregation unit of Internet of things
Technical Field
The invention relates to the technical field of Internet of things, in particular to a method and a system for synchronizing time of an access node and a convergence unit of the Internet of things.
Background
The internet of things digitizes and networks all things through a sensor, a radio frequency identification technology, a positioning technology and the like, and realizes an efficient information interaction mode among articles, between articles and people and between people and a real environment. The time information is a basic parameter in the internet of things, and in many applications of the internet of things, such as state judgment of access nodes or terminal equipment of the internet of things, mutual cooperation of the access nodes, data fusion of the access nodes and the like, the time accuracy is high, and information acquisition tasks can be completed cooperatively. Because the time synchronization requirements in different applications are different, it is difficult to monitor and manage these devices, and therefore, the time synchronization becomes one of the important research subjects of the internet of things.
Disclosure of Invention
The embodiment of the invention discloses a method and a system for synchronizing time of an access node and a convergence unit of the Internet of things, which are used for synchronizing time between the access node and the convergence unit in the Internet of things and realizing effective management of equipment of the Internet of things.
The invention discloses a method for synchronizing the time of an access node and a convergence unit of the Internet of things in a first aspect, which comprises the following steps:
an access node periodically sends a first data packet to a filtering gateway, wherein the first data packet comprises the address information of the access node and a first sending time point of the first data packet;
the filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by a convergence unit according to the access node address information included in the first data packet, and forwards the first data packet to the convergence unit;
the convergence unit receives the first data packet and returns a second data packet, wherein the second data packet comprises the access node address information, the first sending time point, a first receiving time point of the first data packet and a second sending time point of the second data packet;
the filtering gateway identifies the second data packet as a priority forwarding data packet from the forwarding rule table according to the address information of the access node included in the second data packet, and forwards the second data packet to the access node;
and the access node receives the second data packet, calculates a time compensation value between 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 the second data packet, and adjusts the time of the access node according to the time compensation value.
As an optional implementation manner, in the first aspect of the present invention, the periodically sending, by the access node, the first packet to the filtering gateway may include:
the access node periodically acquires the equipment type of the terminal equipment in the wireless network coverage range and the time period for uploading data by the terminal equipment;
the access node sends a first data packet to a filtering gateway, wherein the first data packet comprises the equipment type of the terminal equipment, the time period for the terminal equipment to upload data, the address information of the access node and a first sending time point of the first data packet;
the filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by a convergence unit according to the access node address information included in the first data packet, and forwards the first data packet to the convergence unit, including:
and the filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by a convergence unit according to the access node address information, the equipment type of the terminal equipment and the time period for uploading data by the terminal equipment, which are included by the first data packet, and forwards the first data packet to the convergence unit.
As an optional implementation manner, in the first aspect of the present invention, the identifying, by the filtering gateway according to the access node address information included in the first data packet, the device type of the terminal device, and the time period for the terminal device to upload data, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by an aggregation unit, and forwarding the first data packet to the aggregation unit includes:
the filtering gateway searches out a target forwarding priority associated with access node address information included in the first data packet, the equipment type of the terminal equipment and the time period for uploading data by the terminal equipment from the forwarding rule table, judges whether the target forwarding priority is the highest forwarding priority in the forwarding rule table or not, and forwards the first data packet to the aggregation unit if the target forwarding priority is the highest forwarding priority in the forwarding rule table.
As an optional implementation manner, in the first aspect of the present invention, the first data packet further includes a direction indication identifier; the filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by an aggregation unit according to the access node address information included in the first data packet, and forwarding the first data packet to the aggregation unit includes:
and the filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by a convergence unit according to the access node address information included in the first data packet, and forwards the first data packet to the convergence unit according to a direction indication identifier included in the first data packet.
As an optional implementation manner, in the first aspect of the present invention, the second data packet further includes a direction indicator, and the identifying, by the filtering gateway, that the second data packet is a prioritized forwarding data packet according to the address information of the access node included in the second data packet, and forwarding the second data packet to the access node includes:
and the filtering gateway identifies the second data packet as a priority forwarding data packet from the forwarding rule table according to the address information of the access node included in the second data packet, and forwards the second data packet to the access node according to a direction indication identifier included in the second data packet.
The second aspect of the present invention discloses a system for synchronizing the time of an access node and a convergence unit of the internet of things, which may include:
the access node is used for periodically sending a first data packet to a filtering gateway, wherein the first data packet comprises the address information of the access node and a first sending time point of the first data packet;
the filtering gateway is configured to identify, according to the address information of the access node included in the first data packet, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by a convergence unit, and forward 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, a first receiving time point of the first data packet, and a second sending time point of the second data packet;
the filtering gateway is further configured to identify, according to the address information of the access node included in the second data packet, that the second data packet is a forwarding-priority data packet from the forwarding rule table, and forward the second data packet to the access node;
the access node is further configured to receive the second data packet, calculate a time compensation value between 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 at which the second data packet is received, and adjust its own time according to the time compensation value.
As an optional implementation manner, in the second aspect of the present invention, a manner that the access node is configured to periodically send the first packet to the filtering gateway is specifically:
the access node is used for periodically acquiring the equipment type of the terminal equipment in the wireless network coverage range of the access node and the time period for uploading data by the terminal equipment;
the access node is further configured to send a first data packet to a filtering gateway, where the first data packet includes a device type of the terminal device, a time period for the terminal device to upload data, address information of the access node, and a first sending time point of the first data packet;
the filtering gateway is further configured to identify, according to the address information of the access node included in the first data packet, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by a convergence unit, and a manner of forwarding the first data packet to the convergence unit specifically includes:
the filtering gateway is further configured to identify, according to the access node address information included in the first data packet, the device type of the terminal device, and the time period for the terminal device to upload data, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by a convergence unit, and forward the first data packet to the convergence unit.
As an optional implementation manner, in the second aspect of the present invention, the filtering gateway is further configured to identify, according to the access node address information included in the first data packet, the device type of the terminal device, and a time period for the terminal device to upload data, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by a convergence unit, and a manner of forwarding the first data packet to the convergence unit specifically is:
the filtering gateway is further configured to find out, from the forwarding rule table, a target forwarding priority associated with access node address information included in the first data packet, the device type of the terminal device, and a time period during which the terminal device uploads data, determine whether the target forwarding priority is the highest forwarding priority in the forwarding rule table, and if so, forward the first data packet to the aggregation unit.
As an optional implementation manner, in the second aspect of the present invention, the first data packet further includes a direction indication identifier; the filtering gateway is configured to identify, according to the address information of the access node included in the first data packet, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by an aggregation unit, and a manner of forwarding the first data packet to the aggregation unit specifically includes:
the filtering gateway is configured to identify, according to the address information of the access node included in the first data packet, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by a convergence unit, and forward the first data packet to the convergence unit according to a direction indication identifier included in the first data packet.
As an optional implementation manner, in the second aspect of the present invention, the second data packet further includes a direction indication identifier, and the filtering gateway is further configured to identify, according to the address information of the access node included in the second data packet, that the second data packet is a priority forwarding data packet from the forwarding rule table, and a manner of forwarding the second data packet to the access node is specifically:
the filtering gateway is further configured to identify, according to the address information of the access node included in the second data packet, that the second data packet is a forwarding-priority data packet from the forwarding rule table, and forward the second data packet to the access node according to a direction indication identifier included in the second data packet.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, an access node periodically sends a first data packet to a filter gateway, the first data packet comprises access node address information and a first sending time point of the first data packet, then the filter gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by a convergence unit according to the access node address information included by the first data packet, forwards the first data packet to the convergence unit, the convergence unit responds to the first data packet after receiving the first data packet, returns a second data packet comprising the access node address information, the first sending time point, a first receiving time point of the first data packet and a second sending time point of the second data packet, and determines the second data packet as the priority forwarding data packet according to the access node address information included by the second data packet, and forwards the second data packet to the access node, and finally, the access node calculates a time compensation value between 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 a second receiving time point for receiving the second data packet, and adjusts the time of the access node and the aggregation unit according to the time compensation value, so that the time between the access node and the aggregation unit is synchronized, and the aggregation unit is convenient to manage the Internet of things equipment (including the access node, the terminal equipment and the like).
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of an architecture of an internet of things according to some embodiments of the present invention;
fig. 2 is a schematic flowchart of a method for synchronizing an access node of the internet of things and a time of a convergence unit according to an embodiment of the present invention;
fig. 3 is another schematic flow chart of a method for synchronizing an access node of the internet of things and a time of a convergence unit, disclosed by the embodiment of the invention;
fig. 4 is a schematic structural diagram of a system for synchronizing an access node of the internet of things and time of a convergence unit, disclosed in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, of embodiments of the present invention are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention discloses a method for synchronizing time of an access node and a convergence unit of the Internet of things, which is used for synchronizing time between the access node and the convergence unit of the Internet of things and facilitating management of equipment of the Internet of things, such as the access node, by the convergence unit. The embodiment of the invention correspondingly discloses a system for synchronizing the time of the access node and the convergence unit of the Internet of things.
Before the technical scheme of the present invention is introduced, an internet of things architecture disclosed in some embodiments of the present invention is simply introduced, fig. 1 is a schematic view of an internet of things architecture disclosed in some embodiments of the present invention, it should be noted that fig. 1 is only a schematic view of an internet of things architecture disclosed in some embodiments of the present invention, and other schematic views obtained by optimization or deformation based on fig. 1 all belong to the protection scope of the present invention, which is not exemplified herein. The internet of things architecture shown in fig. 1 may include three layers, namely a terminal device layer, an access node layer, and a convergence layer, according to functional division. Wherein the terminal device layer may include terminal devices of a mass scale, such as hygrometers, smoke sensors, ventilators, rain sensors, irrigation valves, and the like; the access node layer may include a large number of access nodes connected to a network, where the access nodes may include a router, a relay, an access point, and other devices, and the embodiment of the present invention is not limited; the access node can use any standard networking protocol, and can realize data analysis among different network systems; the convergence layer may include a filtering gateway and a convergence unit, wherein the filtering gateway may be in direct or indirect communication connection (not all shown in the figure) with each access node of the access node layer via the internet; the aggregation unit can perform high-level management on each access node of the access node layer through the filtering gateway, so that the control of data transmission frequency, network topology and other networking functions is realized; the convergence unit can analyze and decide the data of the internet of things generated by massive terminal equipment, and can also acquire information or configure parameters of the terminal equipment by sending an instruction (at the moment, the transmission of the data points to the terminal equipment); the aggregation unit may also introduce various services, from big data to social networks, even from social tools "like" to weather sharing, etc. In the internet of things architecture shown in fig. 1, each access node may provide internet of things data transceiving service for a large number of terminal devices within its own wireless network coverage area, wherein each terminal device within its own wireless network coverage area of each access node may have a wireless communication module built therein, so that each access node may perform wireless communication with each terminal device within its own wireless network coverage area in a wireless network communication manner. In the internet of things architecture shown in fig. 1, when a wireless communication module built in a terminal device is produced, an upper frequency point 470MHz and a lower frequency point 510MHz can be input, so that the wireless communication module can automatically define a communication frequency band as 470 MHz-510 MHz to meet the specification of the SRRC standard in china; or, the upper frequency point 868MHz and the lower frequency point 908MHz can be input, so that the wireless communication module can automatically define the communication frequency band to 868 MHz-908 MHz to meet the provisions of the European ETSI standard; or, an upper frequency point 918MHz and a lower frequency point 928MHz can be input, so that the wireless communication module can automatically define the communication frequency band as 918 MHz-928 MHz to meet the specification of the American FCC standard; alternatively, the communication frequency band of the wireless communication module may be defined to comply with the provisions of the japanese ARIB standard or the canadian IC standard, and the embodiment of the present invention is not limited thereto. In the internet of things architecture shown in fig. 1, the terminal device may adopt a method of combining Frequency Division Multiplexing (FDMA), Frequency-Hopping Spread Spectrum (FHSS), Dynamic Time Division Multiplexing (DTDMA), and back-off multiplexing (CSMA) to solve the interference problem.
Based on the internet of things architecture shown in fig. 1, the technical solution of the present invention will be described in detail below with reference to specific embodiments.
Example one
Referring to fig. 2, fig. 2 is a schematic flowchart of a method for synchronizing time of an access node and a convergence unit of the internet of things according to an embodiment of the present invention; as shown in fig. 2, a method for synchronizing an access node of the internet of things and a time of a convergence unit may include:
201. the access node periodically sends a first data packet to the filtering gateway, wherein the first data packet comprises 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 arranged in a parking lot, and the access node address information is the physical address where the parking lot is located. Alternatively, the access node address information may also be an address including the physical address of a certain application site covered by it.
As an alternative, the access node may select a dedicated sub-carrier channel from the transmission band, and then periodically transmit the first data packet to the filtering gateway using the dedicated sub-carrier channel.
Further, the access node may select a dedicated subcarrier channel from the transmission frequency band by using a frequency hopping method, and then periodically transmit the first data packet to the filtering gateway by using the dedicated subcarrier channel.
For example, the dedicated subcarrier channel may be selected in a frequency hopping manner between 100MHz and 1GHz, and one subcarrier channel between 100MHz and 1GHz is selected as the dedicated subcarrier channel for transmitting the first packet. In addition, the dedicated subcarrier channel may select a subcarrier channel having a better channel quality as the dedicated subcarrier channel according to the channel quality.
202. The filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by the aggregation unit according to the access node address information included in the first data packet, and forwards the first data packet to the aggregation unit;
the forwarding rule table comprises the incidence relation between the access node address information and the forwarding priority, the forwarding priority is found according to the access node address information, if the forwarding priority is determined to be the highest forwarding priority in the forwarding rule table, namely the first data packet is identified to be a priority forwarding data packet, and the first data packet is forwarded to the aggregation unit.
As an optional implementation manner, in step 201, the periodically sending, by the access node, the first data packet to the filtering gateway includes: the access node periodically acquires the equipment type of the terminal equipment in the wireless network coverage range and the time period for the terminal equipment to upload data; the access node sends a first data packet to the filtering gateway, wherein the first data packet comprises the equipment type of the terminal equipment, the time period for the terminal equipment to upload data, the address information of the access node and a first sending time point of the first data packet. In this embodiment, 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.
Furthermore, in step 202, the filtering gateway identifies, according to the address information of the access node included in the first data packet, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by the aggregation unit, and forwarding the first data packet to the aggregation unit includes: and the filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by the aggregation unit according to the access node address information, the equipment type of the terminal equipment and the time period for uploading data by the terminal equipment, which are included by the first data packet, and forwards the first data packet to the aggregation unit. In this embodiment, the forwarding rule table includes the address information of the access node, the device type of the terminal device, and the association relationship between the time period for the terminal device to upload data and the forwarding priority, and finds the target forwarding priority according to the address information of the access node, the device type of the terminal device, and the time period for the terminal device to upload data, and if it is determined that the target forwarding priority is the highest forwarding priority in the forwarding rule table, it is determined that the first data packet is a priority forwarding data packet, and the first data packet is forwarded to the aggregation unit.
203. The convergence unit receives the first data packet and returns a second data packet, wherein the second data packet comprises access node address information, a first sending time point, a first receiving time point of the first data packet and a second sending time point of the second data packet;
as an alternative, the aggregation unit may select a dedicated subcarrier channel from the transmission frequency band, and then return the second data packet using the dedicated subcarrier channel.
Further, the aggregation unit may select a dedicated subcarrier channel from the transmission frequency band by using a frequency hopping method, and then return the second data packet by using the dedicated subcarrier channel.
For example, the dedicated subcarrier channel may be selected in a frequency hopping manner between 100MHz and 1GHz, and one subcarrier channel between 100MHz and 1GHz is selected as the dedicated subcarrier channel for transmitting the second packet. In addition, the dedicated subcarrier channel may select a subcarrier channel having a better channel quality as the dedicated subcarrier channel according to the channel quality.
204. The filtering gateway identifies the second data packet as a priority forwarding data packet from the forwarding rule table according to the address information of the access node included in the second data packet, and forwards the second data packet to the access node;
205. and the access node receives the second data packet, calculates a time compensation value between the access node and the convergence 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 the second data packet, and adjusts the time of the access node according to the time compensation value.
In practical cases, network delays exist from the access node to the aggregation unit and from the aggregation unit to the access node, but since the two network delays are bidirectional and have an average value of 0, the time compensation value between the access node and the aggregation unit is shown in the following formula:
a time compensation value between the access node and the aggregation unit is ═ 2 (first receiving time point-first transmitting time point) - (second receiving time point-second transmitting time point);
and the access node adjusts the time of the access node according to the time compensation value, so that the time of the access node is synchronous with the aggregation unit. In the embodiment of the present invention, 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 sending time point, the first receiving time point, the second sending time point and the second receiving time point are corresponding absolute time (hour, minute, second).
In the embodiment of the invention, an access node periodically sends a first data packet to a filter gateway, the first data packet comprises access node address information and a first sending time point of the first data packet, then the filter gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by a convergence unit according to the access node address information included by the first data packet, forwards the first data packet to the convergence unit, the convergence unit responds to the first data packet after receiving the first data packet, returns a second data packet comprising the access node address information, the first sending time point, a first receiving time point of the first data packet and a second sending time point of the second data packet, and determines the second data packet as the priority forwarding data packet according to the access node address information included by the second data packet, and forwards the second data packet to the access node, and finally, the access node calculates a time compensation value between 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 a second receiving time point for receiving the second data packet, and adjusts the time of the access node and the aggregation unit according to the time compensation value, so that the time between the access node and the aggregation unit is synchronized, and the aggregation unit is convenient to manage the Internet of things equipment (including the access node, the terminal equipment and the like).
Example two
Referring to fig. 3, fig. 3 is another schematic flow chart of a method for synchronizing time of an access node and a convergence unit of the internet of things according to the embodiment of the present invention; as shown in fig. 3, a method for synchronizing an access node of the internet of things and a time of a convergence unit may include:
301. the method comprises the steps that an access node periodically sends a first data packet to a filtering gateway, wherein the first data packet comprises access node address information, a direction indication mark and a first sending time point of the first data packet;
in this embodiment, the first data packet further includes a direction indicator, the direction indicator is used to indicate a transmission direction of the first data packet, the transmission direction includes an access node-aggregation unit, an aggregation unit-access node, and the direction indicator 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 indicator is represented by a special bit in the first data packet, and can simply indicate the transmission direction of the first data packet.
302. The filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by the aggregation unit according to the access node address information included in the first data packet, and forwards the first data packet to the aggregation unit according to a direction indication identifier included in the first data packet;
and the filtering gateway reads the direction indication mark from the special bit of the first data packet, identifies the transmission direction of the first data packet according to the direction indication mark and then sends the first data packet out.
As an optional implementation manner, before forwarding the first data packet to the aggregation unit, the filtering gateway determines whether a workload of the aggregation unit exceeds a preset threshold according to a direction indication identifier included in the first data packet, and if the workload of the aggregation unit does not exceed the preset threshold (is equal to or smaller than the preset threshold), the filtering gateway sends the first data packet to the aggregation unit according to the direction indication identifier included in the first data packet; and if the working load of the aggregation unit is lower than the preset threshold, sending the first data packet to the aggregation unit according to the direction indication identifier included by the first data packet.
Further, before forwarding the first data packet to the aggregation unit according to the direction indication identifier included in the first data packet, the filtering gateway receives a load indication sent by the aggregation unit, and when determining that the load indication indicates that the workload of the aggregation unit exceeds a threshold value, the filtering gateway waits for the workload of the aggregation unit to be lower than the threshold value, and sends the first data packet to the aggregation unit according to the direction indication identifier included in the first data packet; and when the load indication indicates that the workload of the aggregation unit does not exceed the threshold (equal to or less than the threshold), the filtering gateway sends the first data packet to the aggregation unit according to the direction indication identifier included in the first data packet.
In the above embodiment, 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 system crash of the aggregation unit caused by an excessive workload of the aggregation unit.
303. The convergence unit receives the first data packet and returns a second data packet, wherein the second data packet comprises access node address information, a direction indication identifier, a first sending time point, a first receiving time point of the first data packet and a second sending time point of the second data packet;
similarly, the second packet further includes a direction indicator for indicating the transmission direction of the second packet, and the direction indicator in the second packet is for indicating the transmission direction of the second packet from the aggregation unit to the access node. The direction indicator is represented by a special bit in the second data packet, and can simply indicate the transmission direction of the second data packet.
304. The filtering gateway identifies the second data packet as a priority forwarding data packet from the forwarding rule table according to the address information of the access node included in the second data packet, and forwards the second data packet to the access node according to the direction indication identifier included in the second data packet;
and the filtering gateway reads the direction indication mark from the special bit of the second data packet, identifies the transmission direction of the second data packet according to the direction indication mark and then sends the second data packet out.
305. And the access node receives the second data packet, calculates a time compensation value between the access node and the convergence 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 the second data packet, and adjusts the time of the access node according to the time compensation value.
In the embodiment of the invention, an access node periodically sends a first data packet to a filter gateway, the first data packet comprises access node address information, a direction indicator and a first sending time point of the first data packet, then the filter gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by a convergence unit according to the access node address information included by the first data packet, forwards the first data packet to the convergence unit according to the direction indicator of the first data packet, after receiving the first data packet, the convergence unit responds to the first data packet and returns a second data packet comprising the access node address information, the direction indicator, the first sending time point, a first receiving time point of the first data packet and a second sending time point of the second data packet, and the filter gateway returns the access node address information included by the second data packet, and finally, the access node calculates a time compensation value between 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 for receiving the second data packet, and adjusts the time of the access node according to the time compensation value, so that the time between the access node and the aggregation unit is synchronized, and the aggregation unit is convenient to manage the Internet of things equipment (including the access node, the terminal equipment and the like).
EXAMPLE III
Referring to fig. 4, fig. 4 is a schematic structural diagram of a system for synchronizing an access node of an internet of things and time of a convergence unit according to an embodiment of the present invention; as shown in fig. 4, a system for synchronizing an access node of the internet of things and a time of a convergence unit may include:
an access node 410, configured to periodically send a first data packet to the filtering gateway 420, where the first data packet includes access node address information and a first sending time point of the first data packet;
the filtering gateway 420 is configured to identify, according to the address information of the access node included in the first data packet, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by the aggregation unit 430, and forward the first data packet to the aggregation unit 430;
a convergence unit 430, configured to receive a first data packet and return a second data packet, where the second data packet includes access node address information, a first sending time point, a first receiving time point of the first data packet, and a second sending time point of the second data packet;
the filtering gateway 420 is further configured to identify, according to the address information of the access node included in the second data packet, that the second data packet is a forwarding-priority data packet 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 a second data packet, calculate a time compensation value between the access node 410 and the aggregation unit 430 according to the first sending time point, the first receiving time point, the second sending time point, and a second receiving time point at which the second data packet is received, and adjust its time according to the time compensation value.
As an alternative, the access node 410 may select a dedicated sub-carrier channel from the transmission band and then periodically transmit the first data packet to the filtering gateway using the dedicated sub-carrier channel.
Further, the access node 410 may select a dedicated sub-carrier channel from the transmission band using frequency hopping, and then periodically transmit the first data packet to the filtering gateway 420 using the dedicated sub-carrier channel.
For example, the dedicated subcarrier channel may be selected in a frequency hopping manner between 100MHz and 1GHz, and one subcarrier channel between 100MHz and 1GHz is selected as the dedicated subcarrier channel for transmitting the first packet. In addition, the dedicated subcarrier channel may select a subcarrier channel having a better channel quality as the dedicated subcarrier channel according to the channel quality.
Similarly, the aggregation unit may select a dedicated sub-carrier channel from the transmission band, and then return the second data packet using the dedicated sub-carrier channel.
Further, the aggregation unit 430 may select a dedicated subcarrier channel from the transmission frequency band by using a frequency hopping method, and then return the second data packet by using the dedicated subcarrier channel.
For example, the dedicated subcarrier channel may be selected in a frequency hopping manner between 100MHz and 1GHz, and one subcarrier channel between 100MHz and 1GHz is selected as the dedicated subcarrier channel for transmitting the second packet. In addition, the dedicated subcarrier channel may select a subcarrier channel having a better channel quality as the dedicated subcarrier channel according to the channel quality.
In practical cases, there are network delays from the access node 410 to the aggregation unit 430 and from the aggregation unit 430 to the access node 410, but since these two network delays are bidirectional and mean value is 0, the time offset between the access node 410 and the aggregation unit 430 is as follows:
a time compensation value between the access node and the aggregation unit is ═ 2 (first receiving time point-first transmitting time point) - (second receiving time point-second transmitting time point);
the access node 410 adjusts its time according to the time offset value such that the access node 410 time is synchronized with the aggregation unit 430. In the embodiment of the present invention, 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 sending time point, the first receiving time point, the second sending time point and the second receiving time point are corresponding absolute time (hour, minute, second).
As an optional implementation, the manner for the access node 410 to periodically send the first data packet to the filtering gateway 420 is specifically:
the access node 410 is configured to periodically obtain the device type of the terminal device 440 within the wireless network coverage area of the access node and a time period for the terminal device 440 to upload data;
the access node 410 is further configured to send a 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 for the terminal device 440 to upload data, access node address information, and a first sending time point of the first data packet;
the filtering gateway 420 is further configured to identify, according to the address information of the access node included in the first data packet, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by the aggregation unit 430, and a manner of forwarding the first data packet to the aggregation unit 430 specifically includes:
the filtering gateway 420 is further configured to identify, 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 for the terminal device 440 to upload data, that the first data packet is a priority forwarding data packet from the forwarding rule table issued by the aggregation unit 430, and forward the first data packet to the aggregation unit 430.
As an optional implementation manner, the filtering gateway 420 is further configured to identify, 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 for the terminal device 440 to upload data, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by the aggregation unit 430, and a manner of forwarding the first data packet to the aggregation unit 430 specifically is as follows:
the filtering gateway 420 is further configured to find 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 for the terminal device 440 to upload data from the forwarding rule table, determine whether the target forwarding priority is the highest forwarding priority in the forwarding rule table, and if so, forward the first data packet to the aggregation unit 430.
As an optional implementation manner, the first data packet further includes a direction indication identifier; the filtering gateway 420 is configured to identify, according to the address information of the access node included in the first data packet, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by the aggregation unit 430, and a manner of forwarding the first data packet to the aggregation unit 430 specifically includes:
the filtering gateway 420 is configured to identify, according to the address information of the access node included in the first data packet, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by the aggregation unit 430, and forward the first data packet to the aggregation unit 430 according to a direction indication identifier included in the first data packet.
The direction indicator is represented by a special bit in the first data packet, and can simply indicate the transmission direction of the first data packet. The filtering gateway 420 reads the direction indicator from the special bit of the first packet, identifies the transmission direction of the first packet according to the direction indicator, and then sends the first packet.
As an optional implementation manner, before the filtering gateway 420 forwards the first data packet to the aggregation unit 430 according to the direction indication identifier included in the first data packet, the filtering gateway 420 determines whether the workload of the aggregation unit 430 exceeds a preset threshold, and if the workload of the aggregation unit 430 does not exceed the preset threshold (is equal to or smaller than the preset threshold), the filtering gateway sends the first data packet to the aggregation unit 430 according to the direction indication identifier included in the first data packet; if the workload of the aggregation unit 430 is lower than the preset threshold, the first data packet is sent to the aggregation unit 430 according to the direction indication identifier included in the first data packet.
Further, before the filtering gateway 420 forwards the first data packet to the aggregation unit 430 according to the direction indication identifier included in the first data packet, the filtering gateway 420 receives a load indication sent by the aggregation unit 430, and when it is determined that the load indication indicates that the workload of the aggregation unit 430 exceeds the threshold value, the filtering gateway 420 waits for the workload of the aggregation unit 430 to be lower than the threshold value, and sends the first data packet to the aggregation unit 430 according to the direction indication identifier included in the first data packet; the filtering gateway 420 sends the first data packet to the aggregation unit 430 according to the direction indication identifier included in the first data packet when determining that the load indication indicates that the workload of the aggregation unit 430 does not exceed the threshold (equal to or less than the threshold).
In the above embodiment, 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, thereby avoiding data loss or system crash of the aggregation unit 430 due to an excessive workload of the aggregation unit 430.
As an optional implementation manner, the second data packet further includes a direction indicator, and the filtering gateway 420 is further configured to identify, according to the address information of the access node included in the second data packet, that the second data packet is a priority forwarding data packet from the forwarding rule table, and a manner of forwarding the second data packet to the access node 410 is specifically:
the filtering gateway 420 is further configured to identify the second packet as a priority forwarding packet from the forwarding rule table according to the address information of the access node included in the second packet, and forward the second packet to the access node 410 according to the direction indicator included in the second packet.
The second packet further includes a direction indicator for indicating the transmission direction of the second packet, and the direction indicator in the second packet is for indicating the transmission direction of the second packet from the aggregation unit 430 to the access node 410. The direction indicator is represented by a special bit in the second data packet, and can simply indicate the transmission direction of the second data packet.
By implementing the system shown in fig. 4, the access node 410 calculates a time compensation value between the access node and the aggregation unit 430, and adjusts its own time according to the time compensation value, so as to synchronize the time between the access node 410 and the aggregation unit 430, and facilitate the aggregation unit 430 to manage the devices of the internet of things (including the access node 410, the terminal device 440, and the like).
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by hardware instructions of a program, and the program may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM), or other Memory, such as a magnetic disk, or a combination thereof, A tape memory, or any other medium readable by a computer that can be used to carry or store data.
The method and the system for synchronizing the time of the access node and the aggregation unit of the internet of things disclosed by the embodiment of the invention are described in detail, a specific embodiment is applied in the method to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (7)

1. A method for synchronizing time of an access node and a convergence unit of the Internet of things is characterized by comprising the following steps:
an access node periodically sends a first data packet to a filtering gateway, wherein the first data packet comprises the address information of the access node and a first sending time point of the first data packet;
the filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by a convergence unit according to the access node address information included in the first data packet, and forwards the first data packet to the convergence unit;
the convergence unit receives the first data packet and returns a second data packet, wherein the second data packet comprises the access node address information, the first sending time point, a first receiving time point of the first data packet and a second sending time point of the second data packet;
the filtering gateway identifies the second data packet as a priority forwarding data packet from the forwarding rule table according to the address information of the access node included in the second data packet, and forwards the second data packet to the access node;
the access node receives the second data packet, calculates a time compensation value between 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 the second data packet, and adjusts the time of the access node according to the time compensation value;
wherein, the access node periodically sends a first data packet to the filtering gateway, including:
the access node periodically acquires the equipment type of the terminal equipment in the wireless network coverage range and the time period for uploading data by the terminal equipment;
the access node sends a first data packet to a filtering gateway, wherein the first data packet comprises the equipment type of the terminal equipment, the time period for the terminal equipment to upload data, the address information of the access node and a first sending time point of the first data packet;
the filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by a convergence unit according to the access node address information included in the first data packet, and forwards the first data packet to the convergence unit, including:
and the filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by a convergence unit according to the access node address information, the equipment type of the terminal equipment and the time period for uploading data by the terminal equipment, which are included by the first data packet, and forwards the first data packet to the convergence unit.
2. The method according to claim 1, wherein 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 a time period for the terminal device to upload data, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by a convergence unit, and forwards the first data packet to the convergence unit, including:
the filtering gateway searches out a target forwarding priority associated with access node address information included in the first data packet, the equipment type of the terminal equipment and the time period for uploading data by the terminal equipment from the forwarding rule table, judges whether the target forwarding priority is the highest forwarding priority in the forwarding rule table or not, and forwards the first data packet to the aggregation unit if the target forwarding priority is the highest forwarding priority in the forwarding rule table.
3. The method of claim 1, wherein the second packet further includes a direction indicator, and wherein the filtering gateway identifies, according to the address information of the access node included in the second packet, that the second packet is a prioritized forwarding packet from the forwarding rule table, and forwards the second packet to the access node, including:
and the filtering gateway identifies the second data packet as a priority forwarding data packet from the forwarding rule table according to the address information of the access node included in the second data packet, and forwards the second data packet to the access node according to a direction indication identifier included in the second data packet.
4. A method for synchronizing time of an access node and a convergence unit of the Internet of things is characterized by comprising the following steps:
an access node periodically sends a first data packet to a filtering gateway, wherein the first data packet comprises the address information of the access node and a first sending time point of the first data packet;
the filtering gateway identifies the first data packet as a priority forwarding data packet from a forwarding rule table issued by a convergence unit according to the access node address information included in the first data packet, and forwards the first data packet to the convergence unit;
the convergence unit receives the first data packet and returns a second data packet, wherein the second data packet comprises the access node address information, the first sending time point, a first receiving time point of the first data packet and a second sending time point of the second data packet;
the filtering gateway identifies the second data packet as a priority forwarding data packet from the forwarding rule table according to the address information of the access node included in the second data packet, and forwards the second data packet to the access node;
the access node receives the second data packet, calculates a time compensation value between 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 the second data packet, and adjusts the time of the access node according to the time compensation value;
wherein the content of the first and second substances,
the second data packet further includes a direction indication identifier, and the filtering gateway identifies, according to the address information of the access node included in the second data packet, that the second data packet is a priority forwarding data packet from the forwarding rule table, and forwards the second data packet to the access node, where the method includes: and the filtering gateway identifies the second data packet as a priority forwarding data packet from the forwarding rule table according to the address information of the access node included in the second data packet, and forwards the second data packet to the access node according to a direction indication identifier included in the second data packet.
5. A system for synchronizing an access node of the Internet of things and time of a convergence unit is characterized by comprising:
the access node is used for periodically sending a first data packet to a filtering gateway, wherein the first data packet comprises the address information of the access node and a first sending time point of the first data packet;
the filtering gateway is configured to identify, according to the address information of the access node included in the first data packet, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by a convergence unit, and forward 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, a first receiving time point of the first data packet, and a second sending time point of the second data packet;
the filtering gateway is further configured to identify, according to the address information of the access node included in the second data packet, that the second data packet is a forwarding-priority data packet from the forwarding rule table, and forward the second data packet to the access node;
the access node is further configured to receive the second data packet, calculate a time compensation value between 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 at which the second data packet is received, and adjust its own time according to the time compensation value;
wherein the content of the first and second substances,
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 used for periodically acquiring the equipment type of the terminal equipment in the wireless network coverage range of the access node and the time period for uploading data by the terminal equipment;
the access node is further configured to send a first data packet to a filtering gateway, where the first data packet includes a device type of the terminal device, a time period for the terminal device to upload data, address information of the access node, and a first sending time point of the first data packet;
the filtering gateway is further configured to identify, according to the address information of the access node included in the first data packet, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by a convergence unit, and a manner of forwarding the first data packet to the convergence unit specifically includes:
the filtering gateway is further configured to identify, according to the access node address information included in the first data packet, the device type of the terminal device, and the time period for the terminal device to upload data, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by a convergence unit, and forward the first data packet to the convergence unit.
6. The system of claim 5, wherein the filtering gateway is further configured to identify, according to the access node address information included in the first data packet, the device type of the terminal device, and a time period for the terminal device to upload data, that the first data packet is a priority forwarding data packet from a forwarding rule table issued by an aggregation unit, and a manner of forwarding the first data packet to the aggregation unit specifically is:
the filtering gateway is further configured to find out, from the forwarding rule table, a target forwarding priority associated with access node address information included in the first data packet, the device type of the terminal device, and a time period during which the terminal device uploads data, determine whether the target forwarding priority is the highest forwarding priority in the forwarding rule table, and if so, forward the first data packet to the aggregation unit.
7. A computer-readable storage medium, characterized in that it stores a computer program which, when executed by hardware, is capable of implementing the method of any one of claims 1 to 4.
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