CN113825103B - Carrier communication system based on LoRa communication - Google Patents
Carrier communication system based on LoRa communication Download PDFInfo
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- CN113825103B CN113825103B CN202110993421.9A CN202110993421A CN113825103B CN 113825103 B CN113825103 B CN 113825103B CN 202110993421 A CN202110993421 A CN 202110993421A CN 113825103 B CN113825103 B CN 113825103B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
Abstract
The application relates to a carrier communication system based on loRa communication belongs to the technical field of communication, the system include the gateway and with a plurality of nodes that the gateway is connected, the gateway: selecting a plurality of different random numbers from a first database, and broadcasting information containing the random numbers to nodes in the whole network; receiving response information sent by the node; judging whether rebroadcasting is needed; and if so, returning to the step of selecting a plurality of different random numbers from the first database, and broadcasting information containing the plurality of random numbers to nodes in the whole network. The present application has the effect of improving the problem of link congestion of the gateway.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a carrier communication system based on LoRa communication.
Background
In communication technology, a carrier wave is an electric wave generated by an oscillator and transmitted over a communication channel, and is modulated to transmit voice or other information. In radio communication, a carrier can be propagated between a base station and a device terminal through a link.
Long Range Radio (Long Range Radio) is a modulation technique of linear frequency modulation spread spectrum, and belongs to carrier communication. The loRa technique does not need to build a base station, and a gateway can control a plurality of equipment terminals connected with the gateway, namely nodes, to realize the transmission of carrier waves on a link, thereby realizing the receiving and sending of information, and the network distribution mode adopting the loRa technique is more flexible, and the construction cost can be greatly reduced.
Currently, a gateway broadcasts a connection request to nodes in the entire network, and after the nodes receive the connection request, the nodes send a response packet to the gateway, thereby establishing a communication connection. However, it is easy for a plurality of nodes to simultaneously transmit response packets to the gateway, and link congestion of the gateway is caused.
Disclosure of Invention
In order to solve the problem of link congestion of the gateway, the application provides a carrier communication system based on LoRa communication.
In a first aspect, the present application provides a carrier communication system based on LoRa communication, which adopts the following technical solutions:
a carrier communication system based on LoRa communication, the system comprising a gateway and a plurality of nodes connected to the gateway, the gateway:
selecting a plurality of different random numbers from a first database, and broadcasting information containing the random numbers to nodes in the whole network;
receiving response information sent by the node;
judging whether rebroadcasting is needed;
and if yes, returning to the step of selecting a plurality of different random numbers from the first database, and broadcasting information containing the random numbers to nodes in the whole network.
By adopting the technical scheme, the nodes in the whole network can sequentially send the response information by broadcasting the information carrying a plurality of random numbers to the nodes, so that only one path of response information is transmitted in the link of the gateway, and the problem of link congestion of the gateway is solved.
Preferably, after selecting a plurality of different random numbers in the first database, the method further includes: storing the plurality of random numbers in a second database;
the determining whether rebroadcasting is required includes:
receiving a current random number sent by the node, matching the current random number with the random number in the second database, and judging whether the matching is successful;
if so, deleting the random number consistent with the current random number in the second database;
if not, clearing the plurality of random numbers stored in the second database, returning to the step of selecting a plurality of different random numbers from the first database, and broadcasting information containing the plurality of random numbers to nodes in the whole network.
Preferably, the determining whether rebroadcasting is required includes:
recording the information time interval between the current time and the time of receiving the response information for the latest time in real time;
judging whether the information time interval is not less than a time threshold value;
and if so, returning to the step of selecting a plurality of different random numbers from the first database, and broadcasting information containing the plurality of random numbers to nodes in the whole network.
Preferably, the determining whether rebroadcasting is required further includes:
recording the information time interval between the current time and the time of receiving the response information for the latest time in real time;
judging whether the information time interval is not less than a time threshold value;
and if so, clearing the plurality of random numbers stored in the second database, returning to the first database to select a plurality of different random numbers, and broadcasting information containing the plurality of random numbers to nodes in the whole network.
In a second aspect, the present application provides a carrier communication system based on LoRa communication, which adopts the following technical solutions:
a carrier communication system based on LoRa communication, the system comprising a gateway and a plurality of nodes connected to the gateway, the plurality of nodes:
monitoring and analyzing the information sent by the gateway to obtain a plurality of random numbers;
randomly selecting one random number from the plurality of random numbers as a current random number;
and sequentially sending response information to the gateway according to the size of the current random number.
By adopting the technical scheme, the node receives the information carrying a plurality of random numbers, then one random number randomly selected from the random numbers is used as the current random number, and the response information is sequentially sent to the gateway according to the size of the current random number, so that only one path of response information is transmitted in the link of the gateway, the problem of link congestion of the gateway is solved, and the node does not need to feed back a response packet to the gateway, so that the operation burden of equipment is reduced.
Preferably, the sequentially sending response information according to the size of the current random number includes:
recording a broadcast time interval between a current time and a time when the information is monitored;
judging whether the broadcast time interval is equal to a plurality of random unit times;
if yes, monitoring whether a link of the gateway is idle;
and if so, simultaneously sending response information and the current random number.
Preferably, the sequentially sending response information according to the size of the current random number further includes:
acquiring a used random number;
and reselecting the current random number according to the used random number, and returning to the step of judging whether the broadcast time interval is equal to a plurality of random unit times.
Preferably, the used random number includes a first random number and a second random number; the obtaining the used random number comprises:
monitoring a first random number in real time before monitoring whether a link of the gateway is idle, wherein the first random number is a current random number selected by a node which has sent response information to the gateway;
and when the non-idle link of the gateway is monitored, monitoring a second random number, wherein the second random number is the current random number selected by the node which is sending the response information to the gateway.
Preferably, after the monitoring and analyzing the information sent by the gateway and acquiring the plurality of random numbers, the method further includes: storing the plurality of random numbers in respective node databases;
the re-selecting the current random number according to the used random number comprises:
after the second random number is monitored, judging whether the current random number is the same as the used random number or not;
and if so, deleting the corresponding numbers of the used random numbers in the corresponding node database, and randomly selecting one corresponding number from the rest corresponding numbers in the node database as the current random number.
Preferably, after the monitoring and analyzing the information sent by the gateway, the method further includes:
is awakened and enters a working state;
after sending the response message to the gateway, the method further comprises:
and entering a state to be awakened, returning to the step of monitoring and analyzing the information sent by the gateway and acquiring a plurality of random numbers.
In summary, the present application includes at least one of the following beneficial technical effects:
1. by broadcasting information carrying a plurality of random numbers to the nodes, the nodes in the whole network can sequentially send response information, so that only one path of response information is transmitted in a link of the gateway, and the problem of link congestion of the gateway is solved;
2. the method comprises the steps that a node receives information carrying a plurality of random numbers, then one random number selected randomly from the random numbers is used as a current random number, and only one path of response information is transmitted in a link of a gateway in a mode that the response information is sequentially sent to the gateway according to the size of the current random number, so that the problem of link congestion of the gateway is solved, and the node does not need to feed back a response packet to the gateway, so that the operation burden of equipment is reduced.
It should be understood that the statements described in this summary are not intended to limit the scope of the disclosure, or the various features described in this summary. Other features of the present application will become apparent from the following description.
Drawings
Fig. 1 is an architecture diagram of a carrier communication system based on LoRa communication according to an embodiment of the present application.
Fig. 2 is a flowchart illustrating a method portion applied by a gateway in a carrier communication system based on LoRa communication according to an embodiment of the present application.
Fig. 3 is a flowchart illustrating a method applied by a node in a carrier communication system based on LoRa communication according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
As shown in fig. 1, N is greater than 1, and N is an integer. The gateway establishes connection with nodes in the whole network and communicates with the nodes in the whole network to realize information transceiving, so that the gateway can receive response information of the nodes after broadcasting. Specifically, the carrier serves as a carrier for carrying information and is transmitted on a link of the gateway. But the link cannot transmit multiple pieces of response information at the same time, otherwise, the link is congested.
In order to solve the problem of link congestion, this embodiment provides a carrier communication system based on LoRa communication, where the system includes a gateway and a plurality of nodes connected to the gateway, where the method used by the gateway is as follows (as shown in fig. 2):
step S101: selecting a plurality of different random numbers from a first database, and broadcasting information containing the random numbers to nodes in the whole network;
step S102: receiving response information sent by a node;
step S103: judging whether rebroadcasting is needed; if yes, returning to the step S101;
in step S101, the random number is a positive number, for example, 100 random numbers of 1 to 100 are stored in the first database, and 10 random numbers of 1 to 10 are selected from the first database by the gateway. It is noted that the number of the plurality of random numbers selected by the gateway is greater than the number of nodes in the whole network.
And the difference value between two adjacent random numbers selected from the first database by the gateway is not greater than a preset difference value. For example, if the predetermined difference is 2, the random numbers selected and transmitted may be 1, 3, 5 … … 9, and 11, respectively.
In step S103, it is determined whether a rebroadcast is required by the first method and/or the second method.
The method comprises the following steps:
after a plurality of different random numbers are selected in a first database, the selected plurality of random numbers are stored in a second database. And receiving the current random number sent by the node at the same time of receiving the response information sent by the node. The current random number is a random number randomly selected from a plurality of random numbers after the node monitors the information.
Matching the received current random number with the random number in the second database, and judging whether the matching is successful or not, namely judging whether the received current random number is consistent with the random number in the second database or not; if yes, deleting the random numbers consistent with the current random numbers in the second database; if not, the plurality of random numbers stored in the second database are emptied, and the process returns to step S101.
The second method comprises the following steps:
and recording the information receiving time of the latest received response information in real time, and then recording the information time interval between the current time and the information receiving time.
Judging whether the information time interval is not less than a time threshold value; if yes, the plurality of random numbers stored in the second database are deleted, and the step S101 is returned to.
For the gateway application method provided above, this embodiment also provides a method for node application. As shown in fig. 3:
step S201: monitoring and analyzing information sent by a gateway to obtain a plurality of random numbers;
step S202: randomly selecting one random number from a plurality of random numbers as a current random number;
step S203: and sending response information to the gateway in sequence according to the size of the current random number.
In step S201, the node is awakened and enters a working state after receiving the information sent by the gateway, at this time, the broadcast receiving time of the monitored information is recorded, and the analyzed plurality of random numbers are stored in the corresponding node database. Next, used random numbers are acquired, the used random numbers including the first random number and the second random number. Specifically, when other nodes send response information and the current random number, the node to send the response information acquires the current random number sent by other nodes by monitoring on a link, and it is noted that in practice, the number of the first random numbers acquired by the first node to send the response information is 0; the second random number is the current random number selected by the node that is sending the reply message to the gateway.
It should be noted that the difference between the time when the node hears the information and the time when the gateway sends the broadcast is very small, and therefore, the broadcast receiving time is considered to be equal to the time when the gateway broadcasts the information.
In step S203, recording a broadcast time interval between the current time and the time when the information is monitored in real time; judging whether the broadcast time interval is equal to a plurality of random unit times or not; if yes, monitoring whether a link of the gateway is idle; if yes, the response information and the current random number are sent at the same time. After the response message and the current random number are sent simultaneously, the state to be woken up is entered, and the process returns to step S201. Assuming that the unit time is 2 seconds, the current random number is 3, and the unit time of the random number is T, T =3 × 3s =9 s.
Monitoring a first random number in real time before monitoring whether a link of a gateway is idle; and when the link of the gateway is monitored to be not idle, monitoring a second random number.
After monitoring the second random number, judging whether the current random number is the same as the used random number; if yes, deleting the corresponding numbers of the used random numbers in the corresponding node database, then randomly selecting one corresponding number from the rest corresponding numbers in the node database as the current random number, and returning to the step of judging whether the broadcasting time interval is equal to a plurality of random unit times. The corresponding numbers in the node database are the plurality of random numbers stored in the node database in step S201.
It should be noted that the unit time is longer than the time for the node to send the response message, so as to ensure that the link will not transmit the response message for the second time after transmitting the current response message.
The following is a detailed description of the method of operating the entire gateway and node.
The gateway selects a plurality of different random numbers from the first database, stores the selected random numbers in the second database, and broadcasts information containing the random numbers to nodes in the whole network.
Each node monitors information sent by the gateway respectively, after the information is monitored, the node is awakened and enters a working state, at the moment, the node records the broadcast receiving time of the monitored information, and in addition, the monitored information is analyzed by the node to obtain a plurality of random numbers.
And each node stores the acquired random numbers into a corresponding node database, and randomly selects one random number from the corresponding node database as the current random number.
Next, the node monitors the first random number in real time and records the broadcast time interval between the current time and the broadcast receiving time in real time; judging whether the broadcast time interval is equal to a plurality of random unit times or not; if yes, monitoring whether a link of the gateway is idle; if yes, simultaneously sending response information and the current random number; if not, monitoring the second random number.
After monitoring the second random number, judging whether the current random number is the same as the used random number; if yes, deleting the corresponding numbers of the used random numbers in the corresponding node database, then randomly selecting one corresponding number from the rest corresponding numbers in the node database as the current random number, and returning to the step of judging whether the broadcasting time interval is equal to a plurality of random unit times.
And after simultaneously sending the response information and the current random number, entering a state to be awakened, and returning to the step that each node monitors the information sent by the gateway respectively.
And the gateway receives the response information sent by the node, and simultaneously, the gateway also receives the current random number sent by the node.
The gateway matches the received current random number with the random number in the second database and judges whether the matching is successful; and if so, deleting the random numbers consistent with the current random numbers in the second database.
The gateway also records the information receiving time of the latest response information receiving in real time, and then records the information time interval between the current time and the information receiving time.
The gateway determines whether the information time interval is not less than a time threshold. And when the information time interval is not less than the time threshold or the received current random number is inconsistent with the random number in the second database, the gateway empties the plurality of random numbers stored in the second database. And then, returning to the step that the network selects a plurality of different random numbers from the first database and stores the selected random numbers in the second database.
In order to better execute the program of the method, the embodiment of the present application provides a gateway, which includes a first memory and a first processor, wherein the first memory stores a computer program capable of being loaded by the first processor and executing the method applied by the gateway.
The embodiment of the present application further provides a node, which includes a second memory and a second processor, where the second memory stores a computer program that can be loaded by the second processor and execute the method applied by the node.
In embodiments of the present application, the first memory and the second memory may each be configured to store an instruction, a program, code, a set of codes, or a set of instructions. The first memory and the second memory may include a program storage area and a data storage area, where the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a node listening for information sent by a gateway, etc.), instructions for implementing a carrier communication system based on LoRa communication provided in this embodiment, and the like; the storage data area may store data and the like involved in the carrier communication system based on LoRa communication provided in the embodiment of the present application.
The first processor and the second processor may each include one or more processing cores. The first processor and the second processor perform various functions of the present application and process data by executing or executing instructions, programs, sets of codes, or sets of instructions stored in the first memory and the second memory, calling data stored in the first memory and the second memory. The first Processor and the second Processor may be at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing system (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a Central Processing Unit (CPU), a controller, a microcontroller, and a microprocessor. It is understood that, for different devices, electronic devices for implementing the functions of the first processor and the second processor may be other devices, and embodiments of the present application are not limited in particular.
An embodiment of the present application provides a computer-readable storage medium, for example, including: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk. The computer readable storage medium stores a computer program that can be loaded by a processor and executes the above-described carrier communication system based on LoRa communication.
The specific embodiments are merely illustrative and not restrictive of the present application, and those skilled in the art who review this disclosure may make modifications to the embodiments as required without any inventive contribution, but fall within the scope of the claims of the present application.
Claims (7)
1. A carrier communication system based on LoRa communication, the system comprising a gateway and a plurality of nodes connected to the gateway, wherein the gateway:
selecting a plurality of different random numbers from a first database, and broadcasting information containing the random numbers to nodes in the whole network;
receiving response information sent by the node; the node randomly selects one random number from the plurality of random numbers as a current random number, and sequentially sends response information to the gateway according to the size of the current random number;
judging whether rebroadcasting is needed;
if yes, returning to the step of selecting a plurality of different random numbers from the first database, and broadcasting information containing the random numbers to nodes in the whole network;
after selecting a plurality of different random numbers in the first database, the method further comprises: storing the plurality of random numbers in a second database;
the determining whether rebroadcasting is required includes:
receiving a current random number sent by the node, matching the current random number with a random number in the second database, and judging whether the matching is successful;
if so, deleting the random number consistent with the current random number in the second database;
if not, clearing the plurality of random numbers stored in the second database, returning to the step of selecting a plurality of different random numbers from the first database, and broadcasting information containing the plurality of random numbers to nodes in the whole network.
2. The system of claim 1, wherein the determining whether rebroadcasting is required comprises:
recording the information time interval between the current time and the time of receiving the response information for the latest time in real time;
judging whether the information time interval is not less than a time threshold value;
and if so, returning to the step of selecting a plurality of different random numbers from the first database, and broadcasting information containing the plurality of random numbers to nodes in the whole network.
3. The system of claim 1, wherein the determining whether rebroadcasting is required further comprises:
recording the information time interval between the current time and the time of receiving the response information for the latest time in real time;
judging whether the information time interval is not less than a time threshold value;
and if so, clearing the plurality of random numbers stored in the second database, returning to the first database to select a plurality of different random numbers, and broadcasting information containing the plurality of random numbers to nodes in the whole network.
4. A carrier communication system based on LoRa communication, the system comprising a gateway and a plurality of nodes connected to the gateway, wherein the plurality of nodes:
monitoring and analyzing the information sent by the gateway to obtain a plurality of random numbers;
randomly selecting one random number from the plurality of random numbers as a current random number;
sending response information to the gateway in sequence according to the size of the current random number;
wherein, said sending the response information in turn according to the size of the current random number comprises:
recording a broadcast time interval between a current time and a time when the information is monitored;
judging whether the broadcast time interval is equal to a plurality of random unit times;
if yes, monitoring whether a link of the gateway is idle;
if yes, simultaneously sending response information and the current random number;
the sending of response messages in sequence according to the size of the current random number further comprises:
acquiring a used random number;
and reselecting the current random number according to the used random number, and returning to the step of judging whether the broadcasting time interval is equal to a plurality of random unit times.
5. The system of claim 4, wherein the used random number comprises a first random number and a second random number; the acquiring of the used random number comprises:
monitoring a first random number in real time before monitoring whether a link of the gateway is idle, wherein the first random number is a current random number selected by a node which has sent response information to the gateway;
and when the link of the gateway is monitored to be not idle, monitoring a second random number, wherein the second random number is the current random number selected by the node which is sending the response information to the gateway.
6. The system according to claim 5, wherein after said monitoring and parsing information sent by said gateway and obtaining a plurality of random numbers, further comprising: storing the plurality of random numbers in respective node databases;
the re-selecting the current random number according to the used random number comprises:
after the second random number is monitored, judging whether the current random number is the same as the used random number or not;
and if so, deleting the corresponding numbers of the used random numbers in the corresponding node database, and randomly selecting one corresponding number from the rest corresponding numbers in the node database as the current random number.
7. The system according to any one of claims 4 to 6, further comprising, after said listening for and parsing information transmitted by said gateway:
is awakened and enters a working state;
after sending the response message to the gateway, the method further comprises:
and entering a state to be awakened, returning to the step of monitoring and analyzing the information sent by the gateway and acquiring a plurality of random numbers.
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