CN110290574B - Data transmission method, device, equipment, system and storage medium - Google Patents
Data transmission method, device, equipment, system and storage medium Download PDFInfo
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- CN110290574B CN110290574B CN201910746037.1A CN201910746037A CN110290574B CN 110290574 B CN110290574 B CN 110290574B CN 201910746037 A CN201910746037 A CN 201910746037A CN 110290574 B CN110290574 B CN 110290574B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a data transmission method, a device, equipment, a system and a computer storage medium, wherein the method comprises the following steps: automatically awakening every other preset first time; wherein each wake-up lasts for a second time; during the second time of waking up, performing CAD detection to determine whether a lead code sent by the wake-up device exists in the current channel; when detecting that a preamble exists in a channel, starting to receive an asynchronous wake-up packet sent by wake-up equipment, and after receiving the asynchronous wake-up packet, generating uplink data sent to an application server and opening a receiving window for receiving downlink data so that the application server sends the downlink data through intermediate equipment after receiving the uplink data; the asynchronous wake-up packet is sent to the wake-up equipment by the application server through the intermediate equipment; the downlink data is received through the receiving window, and the problems that the lorawan terminal is large in power consumption and cannot actively receive the downlink data issued by the application server are solved.
Description
Technical Field
The invention relates to the field of application of the Internet of things, in particular to a data transmission method, a data transmission device, data transmission equipment, a data transmission system and a storage medium.
Background
The lorawan protocol is a set of communication protocol and system architecture designed based on the lora long-distance communication network, and is applied to low-power consumption, low-speed and long-distance application scenes. The lorawan protocol provides that the terminal has 3 device types, which are Class a, Class B and Class C types, respectively. The Class A type terminal is in a dormant state all the time when no uplink data exists, and only after the uplink data exists, the Class A type terminal wakes up and opens two short receiving windows to receive the downlink data, although the Class A type terminal has low power consumption, no way is available for actively receiving the downlink data; the Class B type terminal has the basic functions of the Class A type terminal, opens a receiving window at a specified time for receiving downlink data, and is in a dormant state at the rest time; however, a Class B type terminal opens a receiving window once in a beacon period, so that downlink immediacy is poor and downlink data cannot be received at any time; class C terminals are always awake and can receive downlink data at any time, but waste a lot of power consumption, so it is very difficult to let the LoRaWAN terminal actively receive downlink data packets while being in a low power consumption state.
Disclosure of Invention
In view of the foregoing problems, an object of the present invention is to provide a data transmission method, apparatus, device, system and storage medium, which can effectively reduce power consumption of a lorawan terminal in a data transmission process and achieve active downlink data packet reception.
In a first aspect, an embodiment of the present invention provides a data transmission method, including: at a terminal that is in the CLASS a type,
automatically awakening every other preset first time; wherein each wake-up lasts for a second time;
during the second time of waking up, performing CAD detection to determine whether a lead code sent by the wake-up device exists in the current channel;
when detecting that a preamble exists in the channel, starting to receive an asynchronous wake-up packet sent by wake-up equipment, and after receiving the asynchronous wake-up packet, generating uplink data sent to the application server and opening a receiving window for receiving downlink data so that the application server sends the downlink data through intermediate equipment after receiving the uplink data; the asynchronous wake-up packet is sent to the wake-up device by the application server through the intermediate device;
and receiving the downlink data through the receiving window.
Preferably, the first time is 1 s; the second time is 10 ms.
Preferably, the length of the preamble is equal to or greater than the first time.
In a second aspect, embodiments of the present invention provide a data transmission apparatus, in particular for, at a terminal in CLASS a type,
the automatic awakening unit is used for automatically awakening once every preset first time; wherein each wake-up lasts for a second time;
the detection unit is used for carrying out CAD detection in the second wake-up time so as to determine whether the lead code sent by the wake-up equipment exists in the current channel;
a receiving window opening unit, configured to start receiving an asynchronous wake-up packet sent by a wake-up device when detecting that a preamble exists in the channel, and generate uplink data sent to the application server and open a receiving window for receiving downlink data after receiving the asynchronous wake-up packet, so that the application server sends the downlink data through an intermediate device after receiving the uplink data; the asynchronous wake-up packet is sent to the wake-up device by the application server through the intermediate device;
and a downlink data receiving unit, configured to receive the downlink data through the receiving window.
Preferably, the first time is 1 s; the second time is 10 ms.
Preferably, the length of the preamble is equal to or greater than the first time.
In a third aspect, an embodiment of the present invention further provides a data transmission device, which includes a processor, a memory, and a computer program stored in the memory, where the computer program is executable by the processor to implement the data transmission method according to the first aspect.
In a fourth aspect, an embodiment of the present invention further provides a data transmission system, including an intermediate device, an application server, a wake-up device, and the data transmission device according to the third aspect; wherein;
the application server is used for firstly issuing an asynchronous wake-up packet to the intermediate device when downlink data needs to be issued to the data transmission device;
the intermediate device is used for receiving the asynchronous wake-up packet sent by the application server and sending the asynchronous wake-up packet to the wake-up device;
the wake-up device is configured to receive the asynchronous wake-up packet sent by the intermediate device, add a preamble with a preset length to a header of the asynchronous wake-up packet after receiving the asynchronous wake-up packet, and send the asynchronous wake-up packet added with the preamble to the data transmission device;
the data transmission equipment is used for starting to receive an asynchronous wake-up packet sent by the wake-up equipment when a lead code is detected within a second wake-up time, generating uplink data sent to the application server after the asynchronous wake-up packet is received, and opening a receiving window for receiving downlink data;
the application server is further configured to send the downlink data to the data transmission device through an intermediate device after receiving the uplink data sent by the data transmission device;
and the data transmission device is used for receiving the downlink data sent by the application server through the intermediate device through the opened receiving window.
Preferably, the intermediate device includes an NS server and a base station; wherein the content of the first and second substances,
the NS server is used for receiving the asynchronous wake-up packet sent by the application server and forwarding the asynchronous wake-up packet to the base station;
the base station is used for receiving the asynchronous wake-up packet sent by the NS server and sending the asynchronous wake-up packet to the wake-up device; receiving uplink data sent by the data transmission equipment, and forwarding the uplink data to the NS server;
the NS server is also used for receiving uplink data sent by the base station and forwarding the uplink data packet to the application server; receiving downlink data forwarded by the application server;
and the base station is also used for receiving the downlink data transmitted by the application server and forwarded by the NS server and sending the downlink data to the data transmission equipment.
Preferably, said application server communicates with said NS server via MQTT protocol; the NS server communicates with the base station through a UDP protocol; the base station communicates with the awakening device through a lorawan protocol; the wake-up device communicates with the data transmission device via an asynchronous wake-up protocol; the data transmission device communicates with the base station via the lorawan protocol.
In a fifth aspect, the embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the data transmission method described above.
The embodiment of the invention has the following beneficial effects:
in the above embodiment, by performing automatic wake-up every predetermined first time and performing CAD detection within the second time of each wake-up duration to determine whether the preamble sent by the wake-up device exists in the current channel, power consumption of the lorawan terminal in the data transmission process can be effectively reduced. And then when detecting that the preamble exists in the channel, starting to receive an asynchronous wake-up packet sent by wake-up equipment, and after receiving the asynchronous wake-up packet, generating uplink data sent to the application server and opening a receiving window for receiving downlink data so as to receive the downlink data sent by the application server through intermediate equipment, thereby realizing the purpose of receiving downlink data packets at any time.
Drawings
In order to more clearly illustrate the technical solution 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 the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a data transmission method according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a data transmission device according to a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a data transmission system according to a third 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.
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
In the embodiments, the references to "first \ second" are merely to distinguish similar objects and do not represent a specific ordering for the objects, and it is to be understood that "first \ second" may be interchanged with a specific order or sequence, where permitted. It should be understood that "first \ second" distinct objects may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced in sequences other than those illustrated or described herein.
The first embodiment is as follows:
referring to fig. 1, a first embodiment of the present invention provides a data transmission method, which can be executed by a data transmission device, and in particular, executed by one or more processors in the data transmission device, and includes at least the following steps:
s101, automatically awakening every other preset first time; wherein each wake-up lasts for a second time.
And S102, performing CAD detection in the second time of waking up to determine whether the preamble sent by the waking device exists in the current channel.
In this embodiment, the data transmission device is a terminal of the LoRaWAN Class a type, and is simultaneously added with an over-the-air wake-up function, that is, performs automatic wake-up once every predetermined first time; and performing CAD detection during the awakening second time to determine whether the preamble sent by the awakening device exists in the current channel or not. The automatic awakening is carried out once every preset first time, so that the awakening time can be effectively reduced, and the low power consumption is effectively realized. For example, the system wakes up once in a period of 1s and performs CAD detection, wherein the CAD detection time is less than or equal to 10ms, the rest time is in a dormant state, and power is supplied by using a battery so as to reduce the consumption of power consumption. The CAD is Channel Activity Detection (Channel Activity Detection), and the CAD Detection aims to check whether an LoRa preamble exists at a current frequency point, and if the LoRa preamble exists, it indicates that data exists in the current Channel, and the data can be received through Detection.
In this embodiment, the wake-up device is a LoRaWAN Class C type terminal, which is always in a wake-up state, and the receiving window is normally open, and is capable of actively receiving a data packet sent from an application server and waking up a data transmission device using an asynchronous wake-up protocol. The asynchronous wake-up packet is a data packet preset in an asynchronous wake-up protocol; the asynchronous wake-up protocol is a private protocol and is specially used for waking up between the wake-up device and the data transmission device; the preamble is added to the header of the asynchronous wake-up packet in advance by the wake-up device, and it should be noted that the wake-up device adds the preamble with a length at least as long as the first time to the header of the asynchronous wake-up packet, so that the preamble can effectively cover a whole first time range, and it is ensured that the data transmission device can completely detect the preamble.
S103, when detecting that the preamble exists in the channel, starting to receive an asynchronous wake-up packet sent by a wake-up device, and after receiving the asynchronous wake-up packet, generating uplink data sent to the application server and opening a receiving window for receiving downlink data so that the application server sends the downlink data through intermediate equipment after receiving the uplink data; and the asynchronous awakening packet is sent to the awakening equipment by the application server through the intermediate equipment.
And S104, receiving the downlink data through the receiving window.
In this embodiment, the application server performs uplink data and downlink data transmission with the NS server through an MQTT protocol, where it should be noted that the uplink data is an application data packet sent to the application server by the data transmission device; the downlink data is an application data packet sent to the data transmission device by the application server.
In this embodiment, the intermediate device is configured to forward an asynchronous wake-up packet issued by an application server to the wake-up device, forward uplink data sent by a data transmission device to the application server, and forward downlink data issued by the application server to the data transmission device. The intermediate equipment comprises a base station and an NS server, wherein the base station is used as an intermediate forwarding station of a LoRaWAN protocol and is communicated with the NS server through a UDP protocol. The NS server is a Network server (Network Service) of LoRaWAN protocol, is used for managing the equipment information of all terminals in the LoRaWAN Network, is connected with the base station through UDP protocol, and is connected with the application server through MQTT protocol.
It should be noted that the base station communicates with the wake-up device through lorawan protocol; the wake-up device communicates with the data transmission device via an asynchronous wake-up protocol; the data transmission device communicates with the base station via the lorawan protocol.
Specifically, the NS server is configured to receive an asynchronous wake-up packet sent by the application server, and forward the asynchronous wake-up packet to the base station. And the base station is used for receiving the asynchronous wake-up packet sent by the NS server, sending the asynchronous wake-up packet to the wake-up equipment, receiving the uplink data sent by the data transmission equipment and forwarding the uplink data to the NS server. The NS server is further configured to receive uplink data sent by the base station, forward the uplink data packet to the application server, and receive downlink data forwarded by the application server.
In summary, by performing automatic wake-up once every predetermined first time and performing CAD detection within the second time of each wake-up duration to determine whether the preamble sent by the wake-up device exists in the current channel, power consumption of the lorawan terminal in the data transmission process can be effectively reduced. And then when detecting that the preamble exists in the channel, starting to receive an asynchronous wake-up packet sent by wake-up equipment, and after receiving the asynchronous wake-up packet, generating uplink data sent to the application server and opening a receiving window for receiving downlink data so as to receive the downlink data sent by the application server through intermediate equipment, thereby realizing the purpose of receiving downlink data packets at any time.
In a preferred embodiment of the present invention based on the first embodiment, the first time is 1 s; the second time is 10 ms. The first time is sleep time, the second time is awakening time, the awakening time ratio is 0.1%, and power consumption of the lorawan terminal in the data transmission process can be effectively reduced. It should be noted that the first time and the second time may be performed according to actual situations, for example, the first time may also be 2s or 1.5s, and the second time is 15ms or 12ms, where the present invention is not limited specifically herein.
Second embodiment of the invention:
referring to fig. 2, a second embodiment of the present invention provides a data transmission apparatus, in particular for, at a terminal in CLASS a type,
an automatic wake-up unit 100, configured to perform automatic wake-up every predetermined first time; wherein each wake-up lasts for a second time;
a detecting unit 200, configured to perform CAD detection within a second time of waking up to determine whether a preamble sent by a waking device exists in a current channel;
a receiving window opening unit 300, configured to start receiving an asynchronous wake-up packet sent by a wake-up device when detecting that a preamble exists in the channel, and after receiving the asynchronous wake-up packet, generate uplink data sent to the application server and open a receiving window for receiving downlink data, so that the application server sends the downlink data through an intermediate device after receiving the uplink data; the asynchronous wake-up packet is sent to the wake-up device by the application server through the intermediate device;
a downlink data receiving unit 400, configured to receive the downlink data through the receiving window.
In summary, by performing automatic wake-up once every predetermined first time and performing CAD detection within the second time of each wake-up duration to determine whether the preamble sent by the wake-up device exists in the current channel, power consumption of the lorawan terminal in the data transmission process can be effectively reduced. And then when detecting that the preamble exists in the channel, starting to receive an asynchronous wake-up packet sent by wake-up equipment, and after receiving the asynchronous wake-up packet, generating uplink data sent to the application server and opening a receiving window for receiving downlink data so as to receive the downlink data sent by the application server through intermediate equipment, thereby realizing the purpose of receiving downlink data packets at any time.
In a preferred embodiment of the present invention based on the first embodiment, the first time is 1 s; the second time is 10 ms.
Based on the first embodiment, in a preferred embodiment of the present invention, the length of the preamble is equal to or greater than the first time.
Third embodiment of the invention
Referring to fig. 3, a first embodiment of the present invention provides a data transmission system, which includes an intermediate device, an application server 3, a wake-up device 2, and a data transmission device 1; wherein;
the application server 3 is configured to, when downlink data needs to be issued to the data transmission device 1, first issue an asynchronous wake-up packet to the intermediate device;
the intermediate device is configured to receive the asynchronous wake-up packet sent by the application server 3, and send the asynchronous wake-up packet to the wake-up device 2;
the wake-up device 2 is configured to receive the asynchronous wake-up packet sent by the intermediate device, add a preamble with a preset length to a header of the asynchronous wake-up packet after receiving the asynchronous wake-up packet, and send the asynchronous wake-up packet added with the preamble to the data transmission device 1;
the data transmission device 1 is configured to start receiving an asynchronous wake-up packet sent by the wake-up device 2 when a preamble is detected within a second wake-up time, and generate uplink data sent to the application server 3 and open a receiving window for receiving downlink data after receiving the asynchronous wake-up packet;
the application server 3 is further configured to send the downlink data to the data transmission device 1 through an intermediate device after receiving the uplink data sent by the data transmission device 1;
the data transmission device 1 is configured to receive, through the opened receiving window, the downlink data sent by the application server 3 through the intermediate device.
In this embodiment, the intermediate device includes an NS server 4 and a base station 5; wherein the content of the first and second substances,
the NS server 4 is configured to receive an asynchronous wake-up packet sent by the application server 4, and forward the asynchronous wake-up packet to the base station;
the base station 5 is configured to receive the asynchronous wake-up packet sent by the NS server 4, and send the asynchronous wake-up packet to the wake-up device 2; receiving the uplink data sent by the data transmission equipment 1, and forwarding the uplink data to the NS server 4;
the NS server 4 is further configured to receive uplink data sent by the base station 5, and forward the uplink data packet to the application server 3; and receive the downlink data forwarded by the application server 3;
the base station 5 is further configured to receive downlink data sent by the application server 3 and forwarded by the NS server 4, and send the downlink data to the data transmission device 1.
On the basis of the first embodiment, in a preferred embodiment of the present invention, the application server 3 communicates with the NS server 4 through MQTT protocol; the NS server 4 communicates with the base station 5 by means of MQTT protocol; the base station 5 communicates with the wake-up device 2 via lorawan protocol; the wake-up device 2 communicates with the data transmission device 1 via an asynchronous wake-up protocol; the data transmission device 1 communicates with the base station 5 via the lorawan protocol.
The fourth embodiment of the present invention:
a fourth embodiment of the present invention provides a data transmission device comprising a processor, a memory, and a computer program stored in the memory, the computer program being executable by the processor to implement the data transmission method as described above.
Fifth embodiment of the invention:
a fifth embodiment of the present invention provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program runs, a device in which the computer-readable storage medium is located is controlled to execute the data transmission method as described above.
Illustratively, the computer program may be divided into one or more units, which are stored in the memory and executed by the processor to accomplish the present invention. The unit or units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program in the data transmission device.
The data transmission device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a data transmission device, and does not constitute a limitation of the data transmission device, and may include more or less components than those shown, or combine some components, or different components, for example, the data transmission device may also include an input-output device, a network access device, a bus, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the control center of the data transmission device connecting the various parts of the overall data transmission device using various interfaces and lines.
The memory may be used to store the computer programs and/or modules, and the processor may implement the various functions of the data transmission device by running or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the integrated unit of the data transmission device can be stored in a computer readable storage medium if the integrated unit is realized in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. A method of data transmission, comprising: at a terminal of the LoRaWANCLASS type A;
automatically awakening every other preset first time; wherein each wake-up lasts for a second time;
during the second time of waking up, performing CAD detection to determine whether a lead code sent by the wake-up device exists in the current channel; when detecting that a preamble exists in the channel, starting to receive an asynchronous wake-up packet sent by wake-up equipment, and after receiving the asynchronous wake-up packet, generating uplink data sent to an application server and opening a receiving window for receiving downlink data so that the application server sends the downlink data through intermediate equipment after receiving the uplink data; the asynchronous wake-up packet is sent to the wake-up device by the application server through the intermediate device;
receiving the downlink data through the receiving window;
the first time is 1 s; the second time is 10 ms;
the length of the preamble is equal to or greater than a first time.
2. A data transmission apparatus, comprising: the data transmission device is a LoRaWAN Class A type terminal;
the automatic awakening unit is used for automatically awakening once every preset first time; wherein each wake-up lasts for a second time;
the detection unit is used for carrying out CAD detection in the second wake-up time so as to determine whether the lead code sent by the wake-up equipment exists in the current channel;
a receiving window opening unit, configured to start receiving an asynchronous wake-up packet sent by a wake-up device when detecting that a preamble exists in the channel, and generate uplink data sent to an application server and open a receiving window for receiving downlink data after receiving the asynchronous wake-up packet, so that the application server sends the downlink data through an intermediate device after receiving the uplink data; the asynchronous wake-up packet is sent to the wake-up device by the application server through the intermediate device;
a downlink data receiving unit, configured to receive the downlink data through the receiving window;
the first time is 1 s; the second time is 10 ms;
the length of the preamble is equal to or greater than a first time.
3. A data transmission device comprising a processor, a memory and a computer program stored in the memory, the computer program being executable by the processor to implement the data transmission method as claimed in claim 1.
4. A data transmission system comprising an intermediate device, an application server, a wake-up device and a data transmission apparatus according to claim 2; wherein;
the application server is used for firstly issuing an asynchronous wake-up packet to the intermediate device when downlink data needs to be issued to the data transmission device;
the intermediate device is used for receiving the asynchronous wake-up packet sent by the application server and sending the asynchronous wake-up packet to the wake-up device;
the wake-up device is configured to receive the asynchronous wake-up packet sent by the intermediate device, add a preamble with a preset length to a header of the asynchronous wake-up packet after receiving the asynchronous wake-up packet, and send the asynchronous wake-up packet added with the preamble to the data transmission device;
the data transmission equipment is used for starting to receive an asynchronous wake-up packet sent by the wake-up equipment when a lead code is detected within a second wake-up time, generating uplink data sent to the application server after the asynchronous wake-up packet is received, and opening a receiving window for receiving downlink data;
the application server is further configured to send the downlink data to the data transmission device through an intermediate device after receiving the uplink data sent by the data transmission device;
and the data transmission device is used for receiving the downlink data sent by the application server through the intermediate device through the opened receiving window.
5. The data transmission system of claim 4, wherein the intermediate device comprises an NS server and a base station; wherein the content of the first and second substances,
the NS server is used for receiving the asynchronous wake-up packet sent by the application server and forwarding the asynchronous wake-up packet to the base station;
the base station is used for receiving the asynchronous wake-up packet sent by the NS server and sending the asynchronous wake-up packet to the wake-up device; receiving uplink data sent by the data transmission equipment, and forwarding the uplink data to the NS server;
the NS server is also used for receiving uplink data sent by the base station and forwarding the uplink data packet to the application server; receiving downlink data forwarded by the application server;
and the base station is also used for receiving the downlink data transmitted by the application server and forwarded by the NS server and sending the downlink data to the data transmission equipment.
6. The data transmission system of claim 5, wherein the application server communicates with the NS server via MQTT protocol; the NS server communicates with the base station through a UDP protocol; the base station communicates with the awakening device through a lorawan protocol; the wake-up device communicates with the data transmission device via an asynchronous wake-up protocol; the data transmission device communicates with the base station via the lorawan protocol.
7. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the data transmission method of claim 1.
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| CN111414255B (en) * | 2020-03-24 | 2023-05-23 | 武汉慧联无限科技有限公司 | Data issuing control method, device, equipment and computer storage medium |
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