CN111065082B - A wireless gateway communication control method and system - Google Patents

Abstract

The invention discloses a communication control method and a system of a wireless gateway, wherein the system comprises a data source, the wireless gateway and a wireless terminal; the wireless gateway comprises a direct memory access controller, a bus system, a universal asynchronous receiver-transmitter, a first buffer memory, a second buffer memory and a main control unit; the wireless terminal comprises a wireless terminal main control module and a wireless terminal slave machine. The method comprises the following steps: establishing communication connection between the wireless gateway and the data source; receiving communication data sent by a data source by a wireless gateway; storing received communication data into a first-level buffer memory, and determining a receiving buffer full mark of the first-level buffer memory; transferring the communication data from a first-level buffer memory to a second-level buffer memory, and updating a receiving buffer full mark of the first-level buffer memory; and transmitting the communication data from the second-level buffer storage to the wireless terminal. The invention improves the data communication speed of the wireless gateway and the throughput of the wireless gateway, and can be widely applied to the technical field of communication.

Description

A wireless gateway communication control method and system

technical field

The present invention relates to the technical field of communication, in particular to a communication control method and system of a wireless gateway.

Background technique

At present, the popular wireless IoT gateways on the market usually only provide one or two network communication functions, such as Wi-Fi or Ethernet network based on TCP/IP network layer protocol, and cannot support wireless networks such as BLE and ZigBee at the same time. If hardware devices are added on the basis of mobile phones, computers or routers, the generality problem can be solved, but the hardware cost is too high, the communication efficiency is also low, and it lacks portability, easy installation and modular design. Usually, these IoT gateway devices that support BLE and ZigBee only have single-channel communication function, and can only communicate with one wireless device such as BLE or ZigBee at the same time. Due to the limitation of the number of communication channels, they cannot complete multiple wireless devices in parallel. The data communication of devices greatly limits the efficiency of communication and control, and becomes a bottleneck in IoT applications.

In the above-mentioned prior art, the IoT gateway has a single function, low throughput, and high power consumption of the gateway. The generally adopted low power consumption strategy is simply realized by using the main control unit to switch between the working state and the sleep state at the expense of performance.

All existing technologies do not mention how to realize the communication of the IoT gateway with lower power consumption on the premise of ensuring high throughput.

SUMMARY OF THE INVENTION

In view of this, embodiments of the present invention provide a communication control method and system for a wireless gateway with high throughput and low power consumption.

A first aspect of the present invention provides a communication control method for a wireless gateway, including:

Establish a communication connection between the wireless gateway and the data source;

The wireless gateway receives the communication data sent by the data source;

storing the received communication data in the first-level buffer storage, and determining the reception buffer full flag of the first-level buffer storage;

transferring the communication data from the first-level buffer storage to the second-level buffer storage, and updating the reception buffer full flag of the first-level buffer storage;

The communication data is sent from the second level buffer storage to the wireless terminal.

Further, the sending of the communication data from the second-level buffer storage to the wireless terminal includes the following steps:

Based on the preset clock cycle, control the main control unit of the wireless gateway to enter the interrupt scheduling service;

reading communication data from the second level buffer storage via a direct memory access controller of the wireless gateway;

The communication data is transmitted to the wireless terminal main control module through the bus system of the wireless gateway and the universal asynchronous transceiver;

The communication data is transmitted to the wireless terminal slave through the wireless terminal master control module.

Further, the transmitting the communication data to the wireless terminal slave through the wireless terminal master control module includes:

establishing a communication connection between the wireless terminal master control module and the wireless terminal slave;

The service number is obtained by the wireless terminal main control module;

Determine the communication instruction according to the service number;

The communication data is transmitted to the wireless terminal slave according to the communication instruction.

Further, transmitting the communication data to the wireless terminal main control module through the bus system of the wireless gateway and the universal asynchronous transceiver, including:

The wireless terminal main control module determines whether the wireless terminal data transmission completion flag is valid:

If the wireless terminal data transmission completion flag is invalid, then:

According to the UART busy flag, the direct memory access controller is activated to control the main control unit of the wireless gateway to operate in the first low power consumption mode; the direct memory access controller reads data in batches from the second buffer storage, And by the bus system and the universal asynchronous transceiver, the communication data is transmitted to the wireless terminal main control module; finally, the wireless terminal data transmission completion flag is determined;

If the wireless terminal data transmission completion flag is valid, then:

According to the UART busy flag, the main control unit controlling the wireless gateway operates in the first low power consumption mode; or, according to the universal asynchronous transceiver busy flag, the main control unit controlling the wireless gateway operates in the second low power consumption mode.

Further, the communication data received by the wireless gateway from the data source includes:

The data source receives an operation instruction for data push;

The data source sends the communication data to the WiFi device of the wireless gateway through the universal asynchronous transceiver of the wireless gateway according to the operation instruction;

The WiFi device sends the communication data to the first-level buffer storage through the bus system of the wireless gateway.

Further, storing the received communication data in the first-level buffer storage, and determining the receiving buffer full flag of the first-level buffer storage, includes:

Receive data frames in the communication data through the first-level buffer storage;

When the storage space of the first-level buffer storage is full, the receiving buffer full flag is determined.

Further, the transferring the communication data from the first-level buffer storage to the second-level buffer storage, and updating the receiving buffer full flag of the first-level buffer storage, includes:

copying the data frame in the first-level buffer storage to the second-level buffer storage;

When the storage space of the second-level buffer storage is full, determine the sending buffer full flag, and determine the wireless endpoint data sending flag;

Each time the data frame in the first-level buffer storage is copied to the second-level buffer storage, the receiving buffer full flag is modified, so that the first-level buffer storage continues to receive communication data from the data source.

Further, it also includes:

The wireless terminal slave performs data communication with the wireless gateway by means of broadcasting or communication services;

Wherein, in the step that the wireless terminal slave performs data communication with the wireless gateway in a broadcast manner, the broadcasted data frame includes the wireless terminal address, firmware version information, power and reservation information of the wireless terminal slave; the broadcast time interval Dynamically adjustable;

The communication service includes a read service and a write service, the read service is used for sending data to the wireless gateway; the write service is used for receiving data sent by the wireless gateway.

In a second aspect, an embodiment of the present invention further provides a communication control system for a wireless gateway, including a data source, a wireless gateway, and a wireless terminal;

The wireless gateway includes a direct memory access controller, a bus system, a universal asynchronous transceiver, a first buffer storage, a second buffer storage and a main control unit;

The wireless terminal includes a wireless terminal master control module and a wireless terminal slave.

In a third aspect, an embodiment of the present invention further provides a communication control system for a wireless gateway, including:

A communication establishment module for establishing a communication connection between the wireless gateway and the data source;

a first data sending module, used for receiving the communication data sent by the data source by the wireless gateway;

a first buffer module, configured to store the received communication data in the first-level buffer storage, and determine the reception buffer full flag of the first-level buffer storage;

a second buffer module, configured to transfer the communication data from the first-level buffer storage to the second-level buffer storage, and update the receiving buffer full flag of the first-level buffer storage;

The second data sending module is configured to send the communication data from the second level buffer storage to the wireless terminal.

One or more of the technical solutions in the above embodiments of the present invention have the following advantages: after receiving the communication data sent by the data source, the embodiments of the present invention first store the received communication data in the first-level buffer storage, and then store the received communication data in the first-level buffer storage. The communication data is transferred from the first-level buffer storage to the second-level buffer storage, and a two-level data queue is established for data communication, which improves the data communication speed of the wireless gateway and also improves the throughput of the wireless gateway.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a wireless gateway according to an embodiment of the present invention;

2 is a data flow diagram of a wireless gateway according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a communication flow between a wireless terminal master control module and a wireless terminal slave according to an embodiment of the present invention.

Detailed ways

The present invention will be further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments of the description. The step numbers in the embodiments of the present invention are set only for the convenience of elaboration, and the sequence between the steps is not limited, and the execution sequence of the steps in the embodiments can be performed according to the understanding of those skilled in the art Adaptive adjustment.

Aiming at the problems of single function, low throughput and high power consumption of the Internet of Things gateway in the prior art, the embodiments of the present application provide a communication control method and system for a wireless gateway. The purpose of the present invention is to achieve spanning several heterogeneous networks. The reliable communication between the link layer or the transport layer of the network provides the gateway function of two or several adjacent heterogeneous networks, and can use one or more wireless network technologies such as ZigBee, BLE or Wi-Fi and coverage. Many wireless devices within the network exchange data and achieve reliable, stable, and energy-efficient communications while maintaining high throughput.

In particular, the data communication speed of the wireless IoT gateway is improved by establishing a two-level "ping-pong" buffered data queue.

The parallel communication of multi-channel wireless terminal devices is realized through the cooperative work of the direct memory access controller (DMAC) and the main control unit (MCU), which improves the throughput of the wireless Internet of things gateway and reduces the power consumption of the wireless Internet of things gateway at the same time.

Stable and reliable communication is achieved through a time-triggered cooperative scheduler, and different low-power modes are entered through state judgment to ensure that the wireless IoT gateway can communicate with lower power consumption under the premise of high throughput.

First, as shown in FIG. 1 , the structure of the wireless IoT gateway in the embodiment of the present application includes a main control unit (MCU), a direct memory access controller (DMAC), a bus system, and an SDRAM (that is, the first buffer storage in the embodiment of the present application). ), SRAM (that is, the second buffer storage in this embodiment of the present application), UART device 1, UART device 2, and UART device 3. Among them, the UART device 1 is connected to the Wi-Fi module to realize the data source push communication based on the Internet, and the UART device 2 and the UART device 3 can be connected to one or more wireless device modules such as ZigBee and BLE to realize the data source push communication based on a specific protocol.

Referring to FIG. 2 , the data flow of each part in the wireless IoT gateway according to the embodiment of the present application includes the following steps:

1. The wireless IoT gateway initiates a request to establish a connection with the data source;

2. The data source responds to the request, establishes the connection and maintains the connection;

3. The wireless IoT gateway periodically sends "heartbeat" information to the data source to verify the existence of the connection;

4. The data source responds to "heartbeat";

5. Complete the communication between the wireless IoT gateway and the data source;

6. Complete the communication between the wireless IoT gateway and the wireless terminal slave;

7. Complete the response of the wireless IoT gateway to the data push of the wireless terminal slave.

8. Complete the data push response from the data source and the wireless IoT gateway.

The communication between the wireless IoT gateway and the data source is based on the client/server model, in which the wireless IoT gateway is the client and the data source is the server.

The data source judges in real time whether the operation instruction of data push is received, and if so, after executing the corresponding operation instruction, the communication between the data source and the wireless IoT gateway is completed, and the communication result is fed back by the wireless IoT gateway.

The communication between the wireless IoT gateway and the wireless terminal slave is based on the client/server mode, wherein the wireless IoT gateway is the client and the wireless terminal slave is the server.

The wireless IoT gateway judges in real time whether it has received the operation instruction of the data source, and if so, scans according to the slave address of the wireless terminal, and sends out a service application request after scanning to find the corresponding wireless terminal slave. After the communication between the devices, the communication results are fed back, and the communication connection between the wireless IoT gateway and the wireless terminal slave is disconnected, and a complete data communication process between the data source and the wireless terminal is completed.

That is to say, the embodiments of the present application utilize software and hardware cooperation to implement two-level "ping-pong cache" and parallel communication of multiple wireless terminal devices to improve the throughput of the wireless Internet of Things gateway. Two different low-power modes are also designed to reduce the power consumption of the wireless IoT gateway under the premise of ensuring high throughput by means of the direct memory access controller (DMAC) and the main control unit (MCU) working together.

In some embodiments: the UART device 1 is connected to the Wi-Fi module to implement Internet-based data source push communication, and the UART device 2 and the UART device 3 are connected to the BLE wireless terminal main control module.

The communication process between the data source of this application and the wireless IoT gateway is described below:

The communication between the wireless IoT gateway and the data source is based on the client/server model, in which the wireless IoT gateway is the client and the data source is the server.

The data source judges in real time whether it has received the operation instruction of data push, and if so, executes the corresponding operation instruction, and sends the data to the Wi-Fi device connected to the UART device 1, and the wireless IoT gateway will receive the received data through the Wi-Fi device. The data is stored in the two-level "ping-pong" buffer storage of SDRAM through the bus system: the first-level buffer storage is the "receive buffer", which is used to receive the data frame pushed by the data source, and gives the corresponding data when the "receive buffer" is full. "Receive buffer full flag"; the second level of buffer storage is "send buffer", that is, copy the data frame of "receive buffer" into it, and give the corresponding "send buffer full flag" when the "send buffer" is full, and set it at the same time "Wireless terminal data sending flag" is valid; each time a receiving buffer area is released, its "receiving buffer full flag" is modified to ensure that the "receiving buffer" can continue to receive push data from the data source, and the data source and the wireless IoT gateway are now completed. push between each other, and then feedback the communication results.

It should be noted that the BLE wireless terminal in this embodiment of the present application includes a BLE wireless terminal master control module and a BLE wireless terminal slave. The BLE wireless terminal slave has two service working states: broadcasting and communication services, wherein the communication service includes reading /send data.

The broadcast data frame contains data such as wireless terminal address, firmware version, wireless terminal slave power and reserved information. The broadcast interval can be dynamically adjusted. The longer the interval, the more power-saving working mode.

The BLE wireless terminal slave provides two basic services, namely the read feature and the write feature. The former is used to send data to the wireless IoT gateway, and the latter is used to receive data from the wireless IoT gateway.

Referring to FIG. 3 , the communication process between the wireless IoT gateway and the wireless terminal slave is described in detail below, which mainly includes two parts P1 and P2.

The first part P1 is that the main control unit (MCU) enters the interrupt scheduling service according to the set "clock cycle", and uses the direct memory access controller (DMAC) to read the set amount of data from the "transmit buffer" of the SDRAM through the bus. Communication from the system to the BLE wireless terminal master module connected to UART device 2 or UART device 3. The main control unit (MCU) first judges whether the "wireless terminal data transmission completion flag" is valid:

-1: If invalid, judge the status of "UART device busy flag", if not, start the direct memory access controller (DMAC), and at the same time make the main control unit (MCU) enter "Low Power Mode 1" to achieve low power run until the next "clock cycle" interrupt to resume normal operation. The direct memory access controller (DMAC) reads data in batches from the "transmit buffer" of the SDRAM according to the set amount of data, and sends it to the BLE wireless terminal main control module connected to UART device 2 or UART device 3 through the bus system, and sets " UART device 2" or "UART device 3" "UART device busy flag", until the data in the "transmission buffer" is sent, and set the "wireless terminal data transmission completion flag" at the same time.

-2: If it is valid, judge the status of "UART device busy flag", if it is busy, make the main control unit (MCU) enter "LowPower Mode 1" (ie the first low power consumption mode) to realize low power consumption operation, until the next A "clock cycle" interrupt enters normal work again; if it is not busy, the main control unit (MCU) is set to "Low Power Mode 2" (ie, the second low power consumption mode) to enter a very low power consumption working state until the next A "clock cycle" interrupt enters normal operation again.

The second part P2 is the communication between the BLE wireless terminal master control module and the BLE wireless terminal slave. As shown in Figure 3, the premise of the BLE wireless terminal master control module and the BLE wireless terminal slave communication is that a communication connection has been established and received The set amount of data read from the "transmit buffer" of the SDRAM under the control of the direct memory access controller (DMAC) is sent to the BLE wireless terminal main control module connected to the UART device 2 or UART device 3 through the bus system. Each service of the BLE wireless terminal slave has a unique UUID number, and different UUIDs represent different services. The BLE wireless terminal main control module can find out which features are composed of the service through the UUID of the service. Each feature also has its unique UUID number. After the BLE wireless terminal main control module obtains the UUID of the feature, it can obtain the feature through the UUID of the feature. After getting the handle of the characteristic, you can write data to the characteristic value to realize the data communication from the BLE wireless terminal master control module to the BLE wireless terminal slave, and obtain the status of whether the communication is successful or not.

The embodiment of the present invention also provides a communication control system for a wireless gateway, including a data source, a wireless gateway and a wireless terminal;

The wireless gateway includes a direct memory access controller, a bus system, a universal asynchronous transceiver, a first buffer storage, a second buffer storage and a main control unit;

The wireless terminal includes a wireless terminal master control module and a wireless terminal slave.

An embodiment of the present invention also provides a communication control system for a wireless gateway, including:

A communication establishment module for establishing a communication connection between the wireless gateway and the data source;

a first data sending module, used for receiving the communication data sent by the data source by the wireless gateway;

a first buffer module, configured to store the received communication data in the first-level buffer storage, and determine the reception buffer full flag of the first-level buffer storage;

a second buffer module, configured to transfer the communication data from the first-level buffer storage to the second-level buffer storage, and update the receiving buffer full flag of the first-level buffer storage;

The second data sending module is configured to send the communication data from the second level buffer storage to the wireless terminal.

In summary, a communication control method and system for a wireless gateway of the present application has the following advantages:

This application designs a wireless Internet of Things gateway, which realizes reliable communication across the link layer or transport layer of several heterogeneous networks, provides the gateway function of two or several adjacent heterogeneous networks, and can use ZigBee, One or more wireless network technologies such as BLE or Wi-Fi exchange data with many wireless terminal devices within the coverage area, and achieve reliable, stable and energy-saving communication on the premise of ensuring high throughput.

The data communication speed of the wireless Internet of Things gateway is improved by establishing a two-level "ping-pong cache" data queue, and the parallel communication of multi-channel wireless terminal equipment is realized through the cooperative work of the direct memory access controller (DMAC) and the main control unit (MCU). The throughput of the IoT gateway, and two different low-power modes are designed to reduce the power consumption of the wireless IoT gateway.

In some alternative implementations, the functions/operations noted in the block diagrams may occur out of the order noted in the operational diagrams. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality/operations involved. Furthermore, the embodiments presented and described in the flowcharts of the present invention are provided by way of example in order to provide a more comprehensive understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of the various operations are altered and in which sub-operations described as part of larger operations are performed independently.

Furthermore, while the invention is described in the context of functional modules, it is to be understood that, unless stated to the contrary, one or more of the described functions and/or features may be integrated in a single physical device and/or or software modules, or one or more functions and/or features may be implemented in separate physical devices or software modules. It will also be appreciated that a detailed discussion of the actual implementation of each module is not necessary to understand the present invention. Rather, given the attributes, functions, and internal relationships of the various functional modules in the apparatus disclosed herein, the actual implementation of the modules will be within the routine skill of the engineer. Accordingly, those skilled in the art, using ordinary skill, can implement the invention as set forth in the claims without undue experimentation. It is also to be understood that the specific concepts disclosed are illustrative only and are not intended to limit the scope of the invention, which is to be determined by the appended claims along with their full scope of equivalents.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, The scope of the invention is defined by the claims and their equivalents.

The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the described embodiments, and those skilled in the art can also make various equivalent deformations or replacements without departing from the spirit of the present invention, These equivalent modifications or substitutions are all included within the scope defined by the claims of the present application.

Claims (5)

1. A communication control method for a wireless gateway, comprising: Establish a communication connection between the wireless gateway and the data source; The wireless gateway receives the communication data sent by the data source; storing the received communication data in the first-level buffer storage, and determining the reception buffer full flag of the first-level buffer storage; transferring the communication data from the first-level buffer storage to the second-level buffer storage, and updating the reception buffer full flag of the first-level buffer storage; sending the communication data from the second level buffer storage to the wireless terminal; The sending of the communication data from the second-level buffer storage to the wireless terminal includes the following steps: Based on the preset clock cycle, control the main control unit of the wireless gateway to enter the interrupt scheduling service; reading communication data from the second level buffer storage via a direct memory access controller of the wireless gateway; The communication data is transmitted to the wireless terminal main control module through the bus system of the wireless gateway and the universal asynchronous transceiver; transmitting the communication data to the wireless terminal slave through the wireless terminal master control module; The transmitting the communication data to the wireless terminal slave through the wireless terminal master control module includes: establishing a communication connection between the wireless terminal master control module and the wireless terminal slave; The service number is obtained by the wireless terminal main control module; Determine the communication instruction according to the service number; transmit the communication data to the wireless terminal slave according to the communication instruction; The communication data is transmitted to the wireless terminal main control module through the bus system of the wireless gateway and the universal asynchronous transceiver, including: The wireless terminal main control module determines whether the wireless terminal data transmission completion flag is valid: If the wireless terminal data transmission completion flag is invalid, then: According to the UART busy flag, the direct memory access controller is activated to control the main control unit of the wireless gateway to operate in the first low power consumption mode; the direct memory access controller reads data in batches from the second buffer storage, And by the bus system and the universal asynchronous transceiver, the communication data is transmitted to the wireless terminal main control module; finally, the wireless terminal data transmission completion flag is determined; If the wireless terminal data transmission completion flag is valid, then: According to the UART busy flag, the main control unit controlling the wireless gateway operates in the first low power consumption mode; or, according to the UART busy flag, the main control unit controlling the wireless gateway operates in the second low power consumption mode. 2 . The communication control method for a wireless gateway according to claim 1 , wherein the receiving, by the wireless gateway, the communication data sent by the data source comprises: 2 . The data source receives an operation instruction for data push; The data source sends the communication data to the WiFi device of the wireless gateway through the universal asynchronous transceiver of the wireless gateway according to the operation instruction; The WiFi device sends the communication data to the first-level buffer storage through the bus system of the wireless gateway. 3. The communication control method of a wireless gateway according to claim 1, wherein the received communication data is stored in the first-level buffer storage, and it is determined that the reception buffer of the first-level buffer storage is full signs, including: Receive data frames in the communication data through the first-level buffer storage; When the storage space of the first-level buffer storage is full, the receiving buffer full flag is determined. 4 . The communication control method of a wireless gateway according to claim 3 , wherein, by transferring the communication data from the first-level buffer storage to the second-level buffer storage, the first-level buffer is updated. 5 . Stored receive buffer full flags, including: copying the data frame in the first-level buffer storage to the second-level buffer storage; When the storage space of the second-level buffer storage is full, determine the sending buffer full flag, and determine the wireless endpoint data sending flag; Each time the data frame in the first-level buffer storage is copied to the second-level buffer storage, the receiving buffer full flag is modified, so that the first-level buffer storage continues to receive communication data from the data source. 5. The communication control method of a wireless gateway according to any one of claims 1-4, characterized in that, further comprising: The wireless terminal slave performs data communication with the wireless gateway by means of broadcasting or communication services; Wherein, in the step that the wireless terminal slave performs data communication with the wireless gateway in a broadcast manner, the broadcasted data frame includes the wireless terminal address, firmware version information, power and reservation information of the wireless terminal slave; the broadcast time interval Dynamically adjustable; The communication service includes a read service and a write service, the read service is used for sending data to the wireless gateway; the write service is used for receiving data sent by the wireless gateway.

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