WO2014180170A1

WO2014180170A1 - Power line carrier communication method and apparatus

Info

Publication number: WO2014180170A1
Application number: PCT/CN2014/070109
Authority: WO
Inventors: 朱鸣杰; 沈力为; 陈光胜; 赵启山
Original assignee: 上海海尔集成电路有限公司
Priority date: 2013-05-08
Filing date: 2014-01-03
Publication date: 2014-11-13
Also published as: CN104143999A; CN104143999B

Abstract

The present invention provides a power line carrier communication method and apparatus. The power line carrier communication apparatus receives a response message from a target device, and when the packet error ratio carried in the response message exceeds a preset value, the power line carrier communication apparatus sends a measurement command to the target device and obtains channel quality of the power line returned by the target device, the measurement command being used to give an instruction to measure the channel quality of the power line; the power line carrier communication apparatus performs calculation according to the channel quality of the current power line and the size of a data packet to be transmitted in the power line, to obtain transmission parameters for data packet transmission in the power line, and then transmits the data packet in the power line according to the transmission parameters. In this way, the transmission parameters for data packet transmission in the power line can be adjusted in real time according to the current channel quality, thereby improving the channel utilization and ensuring the success rate of the data packet transmission in a power line.

Description

Power line carrier communication method and device

Technical field

The present invention relates to communication technologies, and in particular, to a power line carrier communication method and apparatus. Background Art Power line carrier communication technology is a communication technology for data transmission through a power line to realize data transmission for data, voice, video, and the like.

In the prior art, according to the situation that the terminal node generates different path attenuations due to different positions in the power line carrier communication channel, different transmission parameters may be used for communication, for example: the near-end node can reduce the transmission power and increase the transmission rate, and the far-end node Nodes can increase transmit power and reduce transmission rate.

However, the prior art requires pre-configuration of the transmission parameters, so that the modulation using the power line for data transmission is limited to the pre-configured transmission mode, and the transmission parameters cannot be adaptively adjusted according to actual conditions. Summary of the invention

The invention provides a power line carrier communication method and device, which can adaptively adjust transmission parameters according to actual conditions.

In one aspect, the present invention provides a power line carrier communication method, including:

Step 1. The power line carrier communication device receives a response message of the target device, and when the error packet rate carried in the response message exceeds a preset value, the power line carrier communication device sends a measurement command to the target device, and obtains the target. Channel quality of the power line returned by the device, the measurement command is used to indicate measuring channel quality of the power line;

Step 2: The power line carrier communication device performs calculation according to a channel quality of the current power line and a data packet size to be transmitted in the power line, and obtains a transmission parameter for performing the data packet transmission in the power line;

Step 3: The power line carrier communication device transmits the data packet in the power line according to the transmission parameter. In another aspect, the present invention provides a power line carrier communication apparatus, including: an acquisition module, configured to receive a response message of a target device, where the error packet rate in the response message exceeds a preset value, the power line carrier communication device Sending a measurement command to the target device, and obtaining a channel quality of the power line returned by the target device, where the measurement command is used to indicate measuring a channel quality of the power line;

a processing module, configured to calculate, according to a channel quality of the current power line and a data packet size to be transmitted in the power line, to obtain a transmission parameter for performing the data packet transmission in the power line;

And a sending module, configured to transmit the data packet in the power line according to the transmission parameter. The power line carrier communication method provided by the present invention receives a response message of the target device by the power line carrier communication device, and when the error packet rate carried in the response message exceeds a preset value, the power line carrier communication device sends a measurement command to the target device, and obtains a target. The channel quality of the power line returned by the device, the measurement command is used to indicate the channel quality of the measured power line, and is calculated according to the channel quality of the current power line and the size of the data packet to be transmitted in the power line, and obtained for data packet transmission in the power line. Transmission parameters, and then transmitting data packets in the power line according to the transmission parameters, so that the transmission parameters for data packet transmission in the power line can be adjusted in real time according to the current channel quality, thereby improving the channel. Utilization, and guarantees the success rate of packet transmission on the power line. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic flow chart of a power line carrier communication method according to an embodiment of the present invention;

2 is a flow chart of a power line carrier communication method according to still another embodiment of the present invention.

3 is a flow chart of a power line carrier communication method according to another embodiment of the present invention.

4 is a flow chart of a power line carrier communication method according to another embodiment of the present invention.

FIG. 5 is a schematic diagram of a format of a data frame according to an embodiment of the present invention; FIG.

6 is a schematic diagram of a format of a data frame according to still another embodiment of the present invention;

7 is a flow chart of a power line carrier communication method according to another embodiment of the present invention.

FIG. 8 is a schematic diagram of a power line carrier communication apparatus according to an embodiment of the present invention. detailed description The power line carrier communication method provided by the embodiment of the present invention can be specifically applied to a communication system that performs data packet transmission through a power line, when real-time control of the power line is needed, and the transmission parameter is adjusted in time. The power line carrier communication method provided in this embodiment may be specifically implemented by a power line carrier communication device, where the power line carrier communication device may be disposed in a power line, where the power line carrier communication device may be implemented by using software and/or hardware, for example, The power line carrier communication device may be based on an embedded chip such as a 32-bit or 16-bit central processing unit. Hereinafter, the power line carrier communication method and the power line carrier communication device will be described in detail.

FIG. 1 is a schematic flow chart of a power line carrier communication method according to an embodiment of the present invention. As shown in FIG. 1, the power line carrier communication method may include:

Step 101: The power line carrier communication device receives the response message of the target device, and when the error packet rate carried in the response message exceeds a preset value, the power line carrier communication device sends a measurement command to the target device, and obtains a channel quality of the power line returned by the target device. .

In this embodiment, the measurement command is used to indicate the channel quality of the measured power line. Wherein, step 101 can be applied in the physical layer.

Specifically, in the process of using the power line carrier communication device, if the power line carrier communication device sends the data packet to the target device, and receives the response message of the target device, where the error packet rate carried in the response message exceeds a preset value, The measurement command may be sent by the power line carrier communication device to obtain the channel quality of the power line, the measurement command being used to indicate the channel quality of the power line. It should be noted that, when the power line carrier communication device is used for the first time, the channel quality of the power line can be obtained through information preset in the power line carrier communication device.

Specifically, if the power line carrier communication device does not receive the response message of the target device within the preset duration, the connection with the target device may be established through other paths. Regardless of whether the data packet arrives at the target device from the path originally transmitted by the power line carrier communication device or reaches the target device through another path, if the power line carrier communication device receives the error packet rate in the response message of the target device exceeds a preset value The channel quality of the power line needs to be measured to obtain the channel quality of the power line. It should be noted that the channel quality returned by the target device to the power line carrier device may be a parameter about the channel quality calculated by the target device. At the same time, the obtained channel quality is transmitted to the medium access control layer, wherein measuring the channel quality of the power line may send a measurement command to obtain a measurement result regarding the channel quality.

The power line carrier communication device can return power according to the target device in the medium access control layer Line channel quality, which determines the transmission parameters for packet transmission in the power line. For example, the power line carrier communication device can change the transmission parameters according to the measurement result, and specifically can change the length of the available subcarriers, adjust the length of the cyclic prefix or the optimal paragraph length, thereby real-time adjustment of the data packet splitting, transmission bandwidth, and transmission rate. To adapt to channel changes.

Step 102: The power line carrier communication device calculates according to the channel quality of the current power line and the size of the data packet to be prepared for transmission in the power line, and obtains transmission parameters for data packet transmission in the power line.

Specifically, the power line carrier communication device can calculate the channel quality of the current power line, and the size of the data packet to be transmitted in the power line, and obtain transmission parameters for data packet transmission in the power line.

The channel quality of the power line can be adjusted according to the channel quality of the power line obtained in step 101. Specifically, the channel quality of the power line may be that the number of paths of the channel propagation is greater than the first threshold, the noise of the channel is greater than the second threshold, or the noise shadow effect of the channel. The interference at any frequency point exceeds the third threshold and the like.

For example, if the number of paths of the channel propagation is greater than the first threshold, the length of the cyclic prefix may be increased to improve the inter-signal interference capability of the communication;

If the noise of the channel is greater than the second threshold, that is, the interference noise of the channel is greater than the second threshold, the signal-to-noise ratio can be improved or the number of repetitions of the frame can be increased by increasing the transmission power, so as to improve the decoding rate and obtain higher communication success. Rate

If the noise shadow effect of the channel exceeds the third threshold when the interference of any frequency point exceeds the third threshold, the subcarrier is adjusted, and the subcarrier of the frequency point is shielded by adjusting the subcarrier to avoid interference of the frequency point on the data packet transmission. .

It should be noted that the first threshold, the second threshold, and the third threshold in this embodiment may be adjusted and set according to actual conditions by those skilled in the art.

Step 102 of this embodiment may be applied to the medium access control layer, after obtaining the transmission parameters for transmitting the data packets in the power line, the power line carrier communication device may access the calculated transmission parameters together with the data packets to be transmitted from the medium. The control layer sends to the physical layer for transmission of the data packet by the power line.

Step 103: The power line carrier communication device transmits the data packet in the power line according to the transmission parameter. In this embodiment, the power line carrier communication device may obtain the transmission parameter according to step 102. The data packet is transmitted in the power line, for example, the data packet is segmented according to the transmission parameter, or the modulation parameter, the subcarrier selection, the number of repetitions of the frame, or the length of the cyclic prefix, or a combination thereof, according to the transmission parameter. Adjustment.

The power line carrier communication method provided by the embodiment of the present invention receives a response message of the target device by using the power line carrier communication device, and when the error packet rate carried in the response message exceeds a preset value, the power line carrier communication device sends a measurement command to the target device, and Obtaining a channel quality of a power line returned by the target device, the measurement command is used to indicate a channel quality of the measured power line, and the power line carrier communication device calculates, according to a channel quality of the current power line and a data packet size to be transmitted in the power line, obtained for the power line Transmitting a transmission parameter of the data packet, and then transmitting the data packet in the power line according to the transmission parameter, so that the transmission parameter used for data packet transmission in the power line can be adjusted in real time according to the current channel quality, In turn, the channel utilization rate is improved, and the success rate of data packet transmission on the power line is ensured.

In this embodiment, the power line carrier communication device is disposed on the application layer, the medium access control layer, and the physical layer, and the steps 101 and 103 in the foregoing embodiment are performed through the physical layer, and the step 102 is performed by the medium access control layer. , Specifically:

The power line carrier communication device transmits a measurement command to the target device to obtain a channel quality of the power line returned by the target device, which can be performed at the physical layer;

The power line carrier communication device can perform calculation at the medium access control layer according to the channel quality of the current power line and the size of the data packet to be transmitted in the power line;

The power line carrier communication device can transmit data packets in the power line according to transmission parameters and can be performed at the physical layer.

It should be noted that, before step 103, the method further includes:

The medium access control layer sends a data frame to the physical layer, where the frame header information of the data frame may include a transmission parameter.

Further, on the basis of the foregoing embodiment shown in FIG. 1 , before the obtaining the channel quality of the power line, the method may further include:

The power line carrier communication device acquires a control signal sent by the host computer from the serial communication interface or the power line; and determines an operation mode according to the control signal, and the working mode may include: a master station mode, a slave mode, a test mode, or an upgrade mode;

Specifically, the power line carrier communication device can be based on an application layer service interface (APP-SAP) and a higher level The machine is connected, and receives a control signal sent by the host computer, thereby determining an operation mode according to the control signal, wherein the working mode may include: a master mode, a slave mode, a test mode or an upgrade mode, and the application layer service interface may be a string Line interface, wireless interface, USB or other interface.

In this embodiment, the operation of the test mode or the upgrade mode can be performed by determining the operation mode, and the test mode or the upgrade mode provides remote operation, thereby reducing the test or upgrade cost of the power line.

2 is a schematic flow chart of a power line carrier communication method according to still another embodiment of the present invention. As shown in FIG. 2, the power line carrier communication device can determine the working mode according to the control signal obtained at the application layer. If the working mode is the test mode, the following steps are performed at the application layer. The specific steps may include: Step 201: Power line carrier communication The device determines the working mode as the test mode according to the obtained control signal

Specifically, the power line carrier communication device determines, according to the control signal, that the working mode is a test mode, and the specific item in the test mode may be: sending a master station command frame through the power line carrier and waiting for a response, or adjusting a transmission parameter of the carrier communication transmission, and then re-communicating, etc. .

Step 202: The power line carrier communication device performs testing according to a specific item in the test mode, obtains a test result, and sends the test result to the upper computer, and the upper computer performs data transmission through the application layer service interface and the application layer.

It should be noted that after testing according to a specific item in the test mode, the test result can be obtained, and the test result can be transmitted to the host computer through a serial interface or other interface, or the test result is received through power line remote communication, and Transfer to the host computer.

Step 203: The host computer determines whether to perform upgrade maintenance according to the test result.

It should be noted that, in any of the above manners, the host computer can determine whether to perform upgrade maintenance according to the test result, and whether the power line carrier communication device can be upgraded according to whether the host computer transmits the maintenance or not. The information is processed accordingly. If yes, go to step 204; if no, go to step 205.

Step 204: Convert the working mode to the upgrade mode.

If it is required to enter the upgrade mode, the host computer sends a control signal whose operation mode is the upgrade mode to the power line carrier communication device.

Step 205: Convert the working mode to a master mode or a slave mode;

If it is not required to enter the upgrade mode, the host computer sends a working mode to the power line carrier communication device. In master mode or slave mode, the test mode is exited and the system is restarted so that the power line carrier communication device operates according to the selected mode of operation.

If the working mode is the master mode, step 101, step 102 and step 103 in the above embodiment are executed.

In this embodiment, the test mode operation can be performed by determining the operation mode, and the test mode provides remote operation, thereby reducing the test cost of the power line.

FIG. 3 is a schematic flow chart of a power line carrier communication method according to another embodiment of the present invention. As shown in FIG. 3, the power line carrier communication device can determine the working mode according to the control signal obtained at the application layer. If the working mode is the upgrade mode, the following steps are performed at the application layer. The specific steps may include: Step 301: Power line carrier communication The device determines whether it is a remote upgrade mode based on a control signal received at the application layer.

Specifically, the remote upgrade mode may be determined according to the control signal. If the remote upgrade is performed, step 302 may be performed, and the upgrade data may be sent through the power line. If the remote upgrade is not performed, step 303 may be performed, and the upgrade may be sent through the serial communication interface. data.

Step 302: Send upgrade data through a power line.

It should be noted that, if the remote upgrade is performed, the data may be divided before the upgrade data is sent according to the size of the upgrade data, thereby avoiding noise interference in the power line transmission.

Step 303: Send upgrade data through a serial communication interface.

After the step 302, sending the upgrade data through the power line may specifically include:

Step 304: Check whether the upgrade data is correct.

After the upgrade data is sent to the target device through the power line, after receiving all the upgrade data, the target device checks whether the received upgrade data is correct. If the received upgrade data is correct, step 305 is performed; If the upgrade data is incorrect, go to step 302, send the upgrade data through the power line, and perform step 304 to check whether the upgrade data is correct.

After the step 303, sending the upgrade data through the serial communication interface may specifically include: Step 306: Check whether the upgrade data is correct.

After the upgrade data is sent to the target device through the power line, after receiving all the upgrade data, the target device checks whether the received upgrade data is correct. If the received upgrade data is correct, step 305 is performed; If the upgrade data is incorrect, execute the step. In step 303, the upgrade data is sent through the serial interface, and step 306 is performed accordingly to check whether the upgrade data is correct.

Step 305: Back up data before the power line carrier communication device is upgraded, and update the upgraded data of the power line carrier communication device;

It should be noted that after the data is received correctly, the data before the upgrade of the power line carrier communication device can be backed up, and after the data before the upgrade is backed up, the upgraded data can be saved.

FIG. 4 is a schematic flow chart of a power line carrier communication method according to another embodiment of the present invention. As shown in FIG. 4, the power line carrier communication device may determine the working mode according to the control signal obtained at the application layer. If the working mode is the master mode, the specific steps may further include:

Before the obtaining the channel quality of the power line, the method may further include:

Step 401: Determine a service item in the master station mode.

Specifically, the step may be performed at the application layer. First, the power line carrier communication device determines the working mode as the master station mode according to the control signal received at the application layer, and then the master station needs to connect with the upper concentrator or the upper computer. And determine the service items in the master mode, for example, copy the daily power, zero power on the previous day, or upgrade the target device.

Step 402: The power line carrier communication device constructs according to the data packet received at the application layer, and transmits the constructed data frame to the medium access control layer.

After the power line carrier communication device determines the service item in the master station mode, the data frame transmitted from the application layer to the medium access control layer is constructed according to the data packet received from the upper concentrator or the upper computer, and FIG. 5 is an implementation of the present invention. As shown in FIG. 5, the data frame may include: a frame header information, an address field, and a data field, where the frame header information may be a frame start character, a frame format, or a frame length. In one or any combination, the address field may be one or any combination of a source address, a destination address, or a routing address, and the data field may be one or any combination of data field start symbols or command data. It should be noted that the data frame may also be applicable to the transmission from the medium access control layer to the physical layer, that is, between step 102 and step 103 in the embodiment shown in FIG. 1, the power line carrier communication device transmits the transmission parameter from the medium access control. The layer is sent to the physical layer, and the transmission parameter can be added to the header information of the data frame.

After the medium access control layer receives the data frame sent from the application layer, the power line carrier communication device may determine whether to perform the upgrade of the target device according to the data frame, for example, according to the data frame. The carried data upgrade parameters determine the upgrade of the target device. If an upgrade of the target device is required, the packet can be divided into shorter packets to ensure the correctness of the communication.

On the basis of the foregoing embodiment, FIG. 6 is a schematic diagram of a format of a data frame according to another embodiment of the present invention. As shown in FIG. 6, the structure of a data field of a data frame in the medium access control layer may include: The paragraph control information, the serial number, the data field, and the check code are included, wherein the paragraph control information may be one or any combination of a tone mapping response identifier, a tone mapping request identifier, a paragraph number, a paragraph length, or a last frame identifier. The serial number is the number of the data frame, which can be used together with the paragraph number as a judgment to repeatedly receive the detection of the data, thereby ensuring that the same data is not repeatedly received. The check code is the check code of the data from the beginning of the data frame to the end of the data field.

In this embodiment, if the target device upgrade is required, after the target device upgrade is performed, or if the target device upgrade is not required, after the media access control layer receives the data frame sent from the application layer, the power line carrier communication The device may construct a data frame sent from the medium access control layer to the physical layer, and calculate a transmission parameter of the data packet transmitted at the physical layer after the data frame is constructed, and then transmit parameters and data frames for the physical layer transmission. Sent to the physical layer, and the physical layer sends the data packet to the target device according to the transmission parameter. Specifically, step 101, step 102, and step 103 of the foregoing embodiment may be performed.

After the data packet is sent to the target device by the power line, if the error packet carried in the response message of the target device received by the power line carrier communication device exceeds a preset value, it is determined that the channel needs to be the power line. The quality is measured to obtain the channel quality of the power line, and at the same time, the acquired channel quality is transmitted to the medium access control layer, wherein measuring the channel quality of the power line may send a measurement command to obtain a measurement result regarding the channel quality.

The power line carrier communication device may determine a transmission parameter for data packet transmission in the power line based on the measurement result, that is, the channel quality of the current power line, in the medium access control layer. For example, the power line carrier communication device may change the transmission parameter according to the measurement result, that is, the signal to noise ratio SNR result, and specifically may select available subcarriers, adjust the length of the cyclic prefix or the optimal paragraph length, thereby dividing the data packet, transmitting bandwidth, and transmitting. The rate is adjusted in real time to accommodate channel changes.

It should be noted that, after the working mode is determined according to the control signal, that is, when the working mode is the master mode, when the power line transmits the data packet, the power line carrier communication device can change the working mode that is currently being executed in at least two ways. .

In the first way, the power line carrier communication device can communicate via a serial communication interface or other communication The interrupt handler of the interface determines whether to switch the working mode, for example, switching the executing master mode to the upgrade mode, or switching the master mode to the test mode. It should be noted that, in this embodiment, whether to switch the working mode according to the serial interface or other interfaces may be determined, where the first working mode is a working mode different from the working mode currently in progress; if yes, the working mode is switched to The first working mode; if not, the current working mode is continued. In this embodiment, the period of the inquiry working mode and the time of each inquiry maintenance can be specifically set by a person skilled in the art according to actual conditions.

In a second mode, the power line carrier communication device can determine whether to switch the working mode according to the data packet transmitted in the power line, where the data packet carries the working mode transmission parameter, and the first working mode is different from the working mode currently in progress. The working mode; if yes, the working mode is switched; if not, the current working mode is continued.

While data transmission is performed on the power line, the current working mode can be changed by the above two methods, wherein the power line carrier communication device preferentially executes the control signal acquired through the serial communication interface, that is, the serial communication interface communication interruption priority The level is higher than the physical layer power line carrier communication interruption, so that the system can first respond to the serial interface or other interface interruption when the serial interface or other interface interruption and carrier interruption occur simultaneously, to ensure that the selection of the working mode can be prioritized.

The system can also determine whether the working mode is required to be switched through the power line communication data. The working mode switching byte can be added to the transmitted data frame, and the target device adjusts the working mode according to the data byte after receiving the data.

FIG. 7 is a schematic flowchart diagram of a power line carrier communication method according to another embodiment of the present invention. As shown in FIG. 7, the power line carrier communication device can determine the working mode according to the control signal obtained at the application layer. If the working mode is the slave mode, the specific steps may further include:

Step 701: The power line carrier communication device waits to receive data of other devices, and after receiving, reassembles the data if necessary and distinguishes whether it is a master station command. If yes, go to step 702. If no, go to step 703.

Step 702: Read data that needs to be sent from the application layer to the medium access control layer.

Step 703: Determine whether it is an uplink route or a downlink route, and construct corresponding data and corresponding routing data.

After step 702 or 703, step 704 is performed.

Step 704: The power line carrier communication device transmits the foregoing data from the application layer to the medium access control Floor.

The step 704 in this embodiment is similar to the step 402 in the embodiment shown in FIG. 4, and details are not described herein again.

Step 705: The power line carrier communication device receives the response message of the target device. When the error packet rate carried in the response message exceeds a preset value, the power line carrier communication device sends a measurement command to the target device, and obtains a channel quality of the power line returned by the target device. .

Step 706: Calculate according to the channel quality of the current power line and the size of the data packet to be transmitted in the power line, and obtain a transmission parameter for performing data packet transmission in the power line.

Step 707: The carrier communication device transmits the data packet in the power line according to the transmission parameter.

The implementation of the steps 705, 706, and 707 is similar to the specific implementation of the steps 101, 102, and 103, and details are not described herein again.

In the present embodiment, the selection of the master station mode and the slave mode by the power line carrier communication apparatus enhances the possibility of freely changing the network structure and increases the adaptability of the system in the case of complex channels.

FIG. 8 is a schematic diagram of a power line carrier communication apparatus according to an embodiment of the present invention. As shown in FIG. 8, the power line carrier communication apparatus provided in this embodiment may specifically implement various steps of the power line carrier communication method provided by any embodiment of the present invention, and details are not described herein again. The power line carrier communication device can be placed in the power line.

The power line carrier communication device provided in this embodiment specifically includes:

The obtaining module 801 is configured to receive a response message of the target device. When the error packet rate carried in the response message exceeds a preset value, the power line carrier communication device sends a measurement command to the target device, and obtains a channel quality of the power line returned by the target device. The measurement command is used to indicate the channel quality of the measured power line;

The processing module 802 is configured to calculate, according to a channel quality of the current power line and a data packet size to be transmitted in the power line, to obtain a transmission parameter for performing data packet transmission in the power line;

The sending module 803 is configured to transmit the data packet in the power line according to the transmission parameter.

The power line carrier communication device provided by the embodiment of the present invention receives the response message of the target device by using the power line carrier communication device, and when the error packet rate carried in the response message exceeds a preset value, the power line carrier communication device sends a measurement command to the target device, and Obtaining a channel quality of a power line returned by the target device, the measurement command is used to indicate channel quality of the measured power line, the power line carrier The communication device calculates, according to the channel quality of the current power line and the size of the data packet to be transmitted in the power line, obtains a transmission parameter for performing packet transmission in the power line, and then transmits the data packet in the power line according to the transmission parameter, thereby According to the current channel quality, the transmission parameters for data packet transmission in the power line can be adjusted in real time, thereby improving the channel utilization rate and ensuring the success rate of data packet transmission on the power line.

Further, sending a measurement command to the target device to obtain a channel quality of the power line returned by the target device may be performed at the physical layer;

Calculated at the medium access control layer according to the channel quality of the current power line and the size of the data packet to be transmitted in the power line;

The transmission of data packets in the power line according to the transmission parameters is performed at the physical layer.

Further, the medium access control layer sends a data frame to the physical layer, where the frame header information of the data frame includes a transmission parameter.

The obtaining module 801 is further configured to obtain a control signal sent by the host computer from the serial communication interface or the power line, and determine an operating mode according to the control signal, and the working mode includes: a master mode, a slave mode, a test mode, or an upgrade mode.

The processing module 802 is further configured to determine a working mode according to the working mode parameter carried in the control signal.

The processing module 802 is further configured to determine whether to switch the operating mode based on a control signal obtained from the serial communication interface or from the power line.

It should be noted that the power line carrier communication device preferentially executes the control signal acquired through the serial communication interface.

The transmission parameters include: any one or combination of modulation mode, subcarrier selection, number of repetitions of the frame, or length of the cyclic prefix.

Further, the processing module may be specifically configured to: if the number of paths of the channel propagation is greater than the first threshold, increase the length of the cyclic prefix; if the noise of the channel is greater than the second threshold, increase the number of repetitions of the frame; if the noise shadow effect of the channel The subcarriers are adjusted when the interference at any frequency exceeds the third threshold.

The execution method and effect of the embodiment are similar to those of the foregoing embodiment, and are not described herein again.

One of ordinary skill in the art can understand that all or part of the above method embodiments are implemented. The steps can be completed by the hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. When the program is executed, the steps including the foregoing method embodiments are performed; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

claims

1. A power line carrier communication method, characterized by including:

Step 1. The power line carrier communication device receives a response message from the target device. When the packet error rate carried in the response message exceeds a preset value, the power line carrier communication device sends a measurement command to the target device and obtains the target The channel quality of the power line returned by the device, and the measurement command is used to instruct to measure the channel quality of the power line;

Step 2. The power line carrier communication device calculates based on the current channel quality of the power line and the size of the data packet to be transmitted in the power line, and obtains the transmission parameters for transmitting the data packet in the power line;

Step 3. The power line carrier communication device transmits the data packet in the power line according to the transmission parameters.

2. The power line carrier communication method according to claim 1, characterized in that the power line carrier communication device is cross-layered on the application layer, the medium access control layer and the physical layer, and the steps 1 and 1 are performed through the physical layer. The step 3 is performed through the media access control layer.

3. The power line carrier communication method according to claim 2, characterized in that, before performing step 3, it further includes:

The medium access control layer sends a data frame to the physical layer, and the frame header information of the data frame includes the transmission parameter.

4. The power line carrier communication method according to any one of claims 1 to 3, characterized in that, before obtaining the transmission parameters for transmitting the data packet in the power line, it further includes: the power line The carrier communication device obtains the control signal sent by the host computer from the serial communication interface or power line;

The power line carrier communication device determines a working mode according to the control signal, and the working mode includes: master station mode, slave station mode, test mode or upgrade mode; and when the working mode is the master station mode, execute the Step 2 and Step 3.

5. The power line carrier communication method according to claim 4, wherein the power line carrier communication device preferentially executes the control signal obtained through the serial communication interface.

6. The power line carrier communication method according to claim 5, characterized in that, after the power line carrier communication device determines the working mode according to the control signal, it further includes: The power line carrier communication device determines whether to switch the operating mode according to the control signal obtained from the serial communication interface or the power line.

7. The power line carrier communication method according to claim 6, wherein the transmission parameters include: any one or a combination of modulation mode, subcarrier selection, number of frame repetitions or length of cyclic prefix.

8. The power line carrier communication method according to claim 7, characterized in that, the power line carrier communication device calculates based on the current channel quality of the power line and the size of the data packet to be transmitted on the power line to obtain the The transmission parameters for the data packet transmission in the power line include:

If the number of paths propagated by the channel is greater than the first threshold, increase the length of the cyclic prefix; if the noise of the channel is greater than the second threshold, increase the number of frame repetitions;

If the noise shadow effect of the channel exceeds the third threshold at any frequency point, the subcarriers are adjusted.

9. A power line carrier communication device, characterized by including:

An acquisition module configured to receive a response message from a target device, and when the packet error rate carried in the response message exceeds a preset value, send a measurement command to the target device, and obtain the channel of the power line returned by the target device. Quality, the measurement command is used to instruct to measure the channel quality of the power line;

A processing module configured to perform calculations based on the current channel quality of the power line and the size of the data packet to be transmitted in the power line, and obtain transmission parameters for transmitting the data packet in the power line;

A sending module, configured to transmit the data packet in the power line according to the transmission parameter.

10. The power line carrier communication device according to claim 9, wherein the sending a measurement command to the target device to obtain the channel quality of the power line returned by the target device is performed at the physical layer;

The calculation is performed at the media access control layer based on the current channel quality of the power line and the size of the data packet to be transmitted in the power line;

The transmission of the data packet in the power line according to the transmission parameters is performed at the physical layer.

11. The power line carrier communication device according to claim 10, wherein the medium access control layer sends a data frame to the physical layer, and the frame header information of the data frame contains The transmission parameters.

12. The power line carrier communication device according to any one of claims 9 to 11, characterized in that the acquisition module is also used to acquire the control signal sent by the host computer from the serial communication interface or the power line, and according to the The control signal determines the working mode, and the working mode includes: master mode, slave mode, test mode or upgrade mode.

13. The power line carrier communication device according to claim 12, wherein the control signal obtained through the serial communication interface is executed with priority.

14. The power line carrier communication device according to claim 13, wherein the processing module is further configured to determine whether to switch the operation based on the control signal obtained from the serial communication interface or the power line. model.

15. The power line carrier communication device according to claim 14, wherein the transmission parameters include: any one or a combination of modulation mode, subcarrier selection, number of frame repetitions or length of cyclic prefix.

16. The power line carrier communication device according to claim 15, wherein the processing module is specifically configured to increase the length of the cyclic prefix if the number of paths propagated by the channel is greater than the first threshold; if the channel When the noise of is greater than the second threshold, increase the number of frame repetitions; if the interference of the noise shadow effect of the channel at any frequency point exceeds the third threshold, adjust the subcarriers.