A node channel negotiation allocation method based on power line carrier

Abstract

This invention discloses a method for channel negotiation and allocation based on power line carrier nodes. The technical solution includes the following steps: Step 1, node P sends a negotiation frame; Step 2, node Q receives and demodulates the negotiation frame and statistically analyzes the frequency points within the channel; Step 3, node Q replies with a negotiation frame and the statistical results; Step 4, node P receives, demodulates, and statistically analyzes the data, and makes a decision; Step 5, node P determines the available frequency points for communication channels between nodes P and Q; Step 6, nodes P and Q are configured to communicate using an agreed-upon channel. This method negotiates based on the service channel while optimizing communication quality within the channel frequency band. It can adapt to the complex characteristics of medium-voltage power line environments and improve channel utilization and communication quality. This invention solves the problem of the relative difficulty in implementing a service channel application method based on negotiation channels in medium-voltage power line carrier systems, adapting to the complex characteristics of medium-voltage power line environments and improving channel utilization and communication quality.

Description

Technical Field

[0001] This invention relates to the field of channel allocation technology for power line carrier OFDM communication systems, and in particular to a channel allocation method based on medium-voltage power line carrier. Background Technology

[0002] In power line carrier communication systems, the communication medium is the power line. The topology or physical characteristics of the power line are different from those of traditional communication transmission media. The channel characteristics when transmitting signals are very complex, with heavy loads, strong noise interference, large channel attenuation, and a very harsh communication environment.

[0003] Currently, channel negotiation between nodes in communication systems typically relies on a common negotiation channel to agree on service communication channels. This usually includes a channel negotiation trigger detection process and a channel negotiation interaction process. The channel negotiation trigger detection process detects changes in network device neighbor relationships and channel state changes. If an event of adding a network device is detected, the channel negotiation interaction process is initiated; if an event of deleting a network device is detected, all channels of the deleted network device are released. Channel state change detection: If an event of deteriorating channel state between a network device and its neighboring network devices is detected, the channel negotiation interaction process is initiated. The channel negotiation interaction process: This involves negotiating and selecting the channel between the network device and its neighboring network devices.

[0004] This method of requesting service channels based on negotiation channels is relatively difficult to implement in medium-voltage power line carrier systems. Medium-voltage power line channels have very complex characteristics, with heavy loads, strong noise interference, significant channel attenuation, and a very harsh communication environment, making service channel selection extremely difficult. Furthermore, these channels are typically low-frequency, resulting in relatively few channel allocations; adding negotiation channels would reduce the number of available channels. Summary of the Invention

[0005] To address the shortcomings or drawbacks of existing technologies, this invention proposes a channel negotiation and allocation method based on power line carrier nodes. In medium-voltage carrier communication, which is primarily centralized, the common negotiation channel is eliminated; that is, the negotiation channel becomes the service channel. Negotiation is performed based on the service channel, while simultaneously optimizing communication quality within the channel frequency band. This method can adapt to the complex characteristics of medium-voltage power line environments and improve channel utilization and communication quality.

[0006] To achieve the above objectives, this invention provides a channel negotiation and allocation method based on power line carrier nodes. During the channel negotiation phase, node P sets up negotiation frames and communicates via channel a using subcarrier diversity, sending the message to node Q. The slave node receives the message, parses out the communication status of each subcarrier within the channel, and returns a negotiation frame to node P, carrying the subcarrier information. After receiving the message, node P parses out the subcarrier information of the channel, thus allowing it to calculate the communication capability of each frequency point on the channel and configure the available subcarrier mask for that channel to nodes P and Q. Subsequent communication uses this channel. Simultaneously, multiple channels can be negotiated to select the best channel. Specifically, the method includes the following steps:

[0007] Step 1: Node P constructs a channel negotiation frame, modulates the data onto a subcarrier using OFDM through the carrier channel, and sends it to Node Q;

[0008] Step 2: Node Q receives the demodulated carrier signal and obtains the data of each subcarrier. After the frame verification is passed, the signal-to-noise ratio and amplitude of the subcarrier are calculated. Through analysis, the subcarriers that are demodulated correctly and those that cannot be demodulated can be obtained. At the same time, information such as the signal-to-noise ratio and amplitude of the subcarrier can be obtained.

[0009] Step 3: Node Q constructs a channel negotiation response frame, modulates the data onto a subcarrier using OFDM through the carrier channel, and sends it to Node P;

[0010] Step 4: Node P receives the demodulated carrier signal to obtain data for each subcarrier. After the frame verification is passed, the subcarrier signal-to-noise ratio and amplitude are calculated.

[0011] Step 5: Node P parses the available subcarriers received and extracts the available subcarriers received by Node Q from the message. Through analysis, it can be determined which subcarriers can be demodulated correctly and which cannot be demodulated when Node P and Node Q receive the message. At the same time, information such as the signal-to-noise ratio amplitude of the subcarriers can be obtained. When making a decision, it is judged based on whether demodulation is possible and whether the threshold is met. After analysis, the available subcarriers used for receiving and transmitting in the communication channel of Node P and Node Q are determined.

[0012] Step 6: Node P issues a configuration command to configure the receiving and transmitting subcarrier masks for node Q, and node P also adopts the corresponding subcarrier mask;

[0013] Step 7: Node P and Node Q communicate based on the agreed-upon channel. After the channel agreement is reached, the nodes can periodically negotiate in subsequent communications based on the communication situation, check changes in the channel communication status, and adjust the communication channel as needed. Further, in Step 1, a subcarrier diversity method is used to distribute data according to subcarriers, meaning each subcarrier carries complete frame information. Negotiation can be achieved as long as there are available frequency points within the channel.

[0014] In the further step 2, the data of each subcarrier is demodulated. If a certain subcarrier can be demodulated and passes the verification, it indicates that the communication effect of the subcarrier is good. At the same time, the signal-to-noise ratio and amplitude are calculated based on the FFT data and the fourth-order moment calculation method. This parameter can be used as a reference parameter to help determine the communication effect of the subcarrier.

[0015] In the further step 5, the decision method is to analyze the subcarrier communication effect, the signal-to-noise ratio threshold, and the amplitude threshold to determine the subcarrier to be used.

[0016] In the further step 7, after the node channel agreement is completed, it can be agreed in real time during communication according to the needs, or the best channel can be determined after all channel conditions are statistically analyzed before communication can proceed. When all channels are being negotiated, node Q can use the channel polling method to wait for negotiation.

[0017] The beneficial effects of this invention are: It fully utilizes various service channels in medium-voltage carrier communication, negotiates based on these service channels, and optimizes communication quality within the channel frequency band. It can adapt to the complex characteristics of medium-voltage power line environments and improve channel utilization and communication quality. Attached Figure Description

[0018] Figure 1 This is a flowchart of the channel negotiation and allocation method based on power line carrier nodes.

[0019] Figure 2 The flowchart of the negotiation frame diversity communication process based on the power line carrier node channel negotiation allocation method is shown below. Detailed Implementation

[0020] The core of this invention is to negotiate based on the service channel and optimize the communication quality within the channel frequency band to adapt to the complex characteristics of the medium-voltage power line communication environment and improve channel utilization and communication quality.

[0021] To make the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. Figure 1 The processing steps mainly include: node P sending a channel negotiation frame; node Q receiving the negotiation frame and performing demodulation and statistics; node Q replying with a negotiation frame and statistics; node P receiving the message and performing demodulation and statistics; and finally determining the channel status and configuring it.

[0022] Step 1: Node P constructs a channel negotiation frame. This frame contains a frame length byte, a frame control information byte, and a payload data byte. The last two bytes are the frame checksum value, using CRC16 checksum. A subcarrier diversity method is used, where data is distributed according to subcarriers, meaning each subcarrier carries complete frame information. Negotiation can be achieved as long as an available frequency point exists in the channel. Figure 2This is a channel-negotiated diversity communication method. Data 1 and Data 2 are the same data. The data is modulated onto a subcarrier using OFDM through the carrier channel and sent to node Q.

[0023] Step 2: Node Q receives and demodulates the carrier signal to acquire data from each subcarrier. It calculates the checksum of each subcarrier data. If the frame checksum matches the checksum in the transmitted message, the checksum passes. The subcarrier signal-to-noise ratio (SNR) and amplitude are then calculated. The data from each subcarrier is demodulated. If a subcarrier can be demodulated and passes the checksum, it indicates good communication performance for that subcarrier. Simultaneously, the SNR and amplitude are calculated using FFT data and the fourth-order moment calculation method. These parameters indicate the communication quality of each subcarrier in the channel and can also serve as reference parameters to assist in determining the subcarrier communication performance.

[0024] Step 3: Node Q constructs a channel negotiation response frame. The message format of the response frame is the same as that of the negotiation frame. The data field is expanded to include the identification results of whether each subcarrier of Node Q can communicate. The data is sent using the subcarrier diversity method. The data is modulated onto the subcarriers using OFDM through the carrier channel and sent to Node P.

[0025] Step 4: Node P receives the demodulated carrier signal to obtain the data of each subcarrier, calculates the check data of each subcarrier data, and if the frame check result is the same as the check result in the sent message, it indicates that the check is passed. The subcarrier signal-to-noise ratio and amplitude are calculated.

[0026] Step 5: Node P parses the available subcarriers received and extracts the available subcarriers received by Node Q from the message. Analysis reveals which subcarriers Node P and Node Q can correctly demodulate and which cannot. It also obtains the signal-to-noise ratio (SNR) amplitude information of the subcarriers, which indicates the communication quality of each subcarrier in the channel. Based on whether demodulation is correct and whether it falls within a threshold range, the analysis determines the available subcarriers used for reception and transmission in the communication channel of Node P and Node Q, identifies the used subcarrier channel, and uses bits in bytes to identify each subcarrier. Setting and clearing bits for available and unavailable subcarriers yields the subcarrier mask.

[0027] Step 6: Node P issues a configuration command to configure the receiving and sending subcarrier masks for node Q. At the same time, node P also adopts the corresponding subcarrier mask. After the configuration is completed, the communication channel between node P and node Q has been negotiated.

[0028] Step 7: Node P and Node Q communicate based on the negotiated channel.

[0029] Step 8: After the node channel is negotiated, it can periodically negotiate based on the communication situation in subsequent communications, check changes in channel communication status, and adjust the communication channel as needed. It can also statistically analyze the communication status of this channel and other channels, selecting the channel with the best communication capabilities for further communication.

[0030] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are permitted.

Claims

1. A channel negotiation and allocation method based on power line carrier nodes, characterized in that, Includes the following steps: Step 1: Node P constructs a channel negotiation frame, modulates the data onto a subcarrier using OFDM through the carrier channel, and sends it to Node Q; Step 2: Node Q receives the demodulated carrier signal and obtains the data of each subcarrier. After the frame verification is passed, the signal-to-noise ratio and amplitude of the subcarrier are calculated. Through analysis, the subcarriers that are demodulated correctly and those that cannot be demodulated are obtained. At the same time, the signal-to-noise ratio and amplitude information of the subcarrier are obtained. Step 3: Node Q constructs a channel negotiation response frame, modulates the data onto a subcarrier using OFDM through the carrier channel, and sends it to Node P; Step 4: Node P receives the demodulated carrier signal to obtain data for each subcarrier. After the frame verification is passed, the subcarrier signal-to-noise ratio and amplitude are calculated. Step 5: Node P parses the available subcarriers received and extracts the available subcarriers received by Node Q from the message. Through analysis, it obtains the subcarriers that Node P and Node Q can demodulate correctly and those that cannot. At the same time, it obtains the signal-to-noise ratio and amplitude information of the subcarriers. In the decision-making process, it judges whether the demodulation can be correct and whether the threshold is met. After analysis, it determines the subcarriers used for receiving and transmitting in the communication channel of Node P and Node Q. Step 6: Node P issues a configuration command to configure the receiving and transmitting subcarrier masks for node Q, and node P also adopts the corresponding subcarrier mask; Step 7: Node P and Node Q communicate based on the agreed channel. After the channel agreement is reached, the nodes will negotiate periodically in subsequent communications based on the communication situation, check changes in the channel communication situation, and adjust the communication channel as needed.

2. The method for channel negotiation and allocation based on power line carrier nodes according to claim 1, characterized in that, The negotiation frame in step 1 adopts the subcarrier diversity method, which divides the data according to the subcarrier diversity, that is, each subcarrier carries complete frame information, and negotiation can be achieved as long as there are available frequency points in the channel.

3. The method for channel negotiation and allocation based on power line carrier nodes according to claim 1, characterized in that, Step 2 demodulates the data of each subcarrier. If a subcarrier can be demodulated correctly and pass the verification, it indicates that the communication effect of the subcarrier is good. At the same time, the signal-to-noise ratio and amplitude are calculated based on the FFT data and the fourth-order moment calculation method. The signal-to-noise ratio and amplitude parameters are used as reference parameters to assist in judging the communication effect of the subcarrier.

4. The method for channel negotiation and allocation based on power line carrier nodes according to claim 1, characterized in that, In step 5, the decision method analyzes the subcarrier communication effect, signal-to-noise ratio threshold, and amplitude threshold to determine the subcarrier to be used.

5. The method for channel negotiation and allocation based on power line carrier nodes according to claim 1, characterized in that, In step 7, after the node channel agreement is completed, it can be agreed on in real time according to the needs during communication. Alternatively, the best channel can be determined after all channel conditions have been statistically analyzed before communication can proceed. When negotiating all channels, node Q uses a channel polling method to wait for negotiation.

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