Wide-band and narrow-band communication network conversion method based on power line carrier communication

Abstract

The invention relates to the technical field of electric power communication, in particular to a power line carrier communication-based broadband and narrowband communication network conversion method, which comprises the following steps of: collecting broadband communication network information and narrowband communication network information to be converted; the detection module is used for detecting the quality of carrier communication signals sent by a broadband communication network and a narrowband communication network, the noise environment around a power line, the data transmission requirement of an application scene and the quality of the power line, so that the broadband communication network and the narrowband communication network are flexibly converted; the receiving ends of the broadband communication network and the narrowband communication network are ensured to be normally opened, and the carrier communication signals are recorded at the conversion node by adopting a recording module after the broadband and narrowband communication network is converted. According to the invention, through the preset value which is set in advance, the receiving end of the communication network before conversion can be closed only when the interference suffered by the communication network after conversion exceeds the preset value, so that the communication efficiency can be improved, and the delay and the error rate can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power communication, and in particular to a method for converting a wide-band or narrow-band communication network based on power line carrier communication. Background Art

[0002] With the rapid development of economy, the smart grid has realized the "last 500 meters" communication connecting the electric meters of thousands of households relying on the automatic meter reading system. The automatic meter reading system must not only meet the communication speed and reliability requirements of meter reading, but also be low-cost, easy to install and easy to maintain, which requires high requirements for power line communication technology. The early power line carrier technology used single carrier FSK, and the communication frequency band was about 7k-500k, with poor anti-interference ability. This is narrowband communication, and the narrowband communication rate is very low, usually less than 9600bps, generally only 1200bps. Because the signal-to-noise ratio of communication under power is difficult to stabilize in the ever-changing power consumption environment, it cannot be well guaranteed, but the narrowband transmission distance is long, up to kilometers. In 2009, the second-generation carrier communication using orthogonal frequency division multiplexing technology began to replace the first-generation carrier communication technology at home and abroad, that is, broadband communication. Using orthogonal frequency division technology, the frequency is 2M-30MHz, the communication rate is greater than 10Mhz, and can reach 200Mhz. However, as the rate increases, the carrier communication distance is limited. Therefore, it is necessary to flexibly convert between wide-band and narrow-band communication networks according to actual transmission conditions.

[0003] However, during the conversion process of the current broadband and narrowband communication networks, when broadband and narrowband reception and transmission are performed on the same device, the narrowband reception needs to be turned off during broadband reception, and the broadband reception needs to be turned off during narrowband reception to ensure that the impedance noise is minimized. However, in some cases, after the broadband and narrowband communication networks are converted, the broadband and narrowband communication networks before the conversion will not cause too much interference to the broadband and narrowband communication networks after the conversion. At this time, if the receiving end of the broadband and narrowband communication networks before the conversion is turned off, the communication signal will not be improved too much, and the frequent closing of the narrowband receiving end or the broadband receiving end will result in reduced communication efficiency, waste of resources, increased delays and increased bit error rates. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art and to propose a method for converting a wide-band and narrow-band communication network based on power line carrier communication.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a method for converting a wide-band or narrow-band communication network based on power line carrier communication, comprising the following steps:

[0006] (1) Collect information about the broadband communication network and narrowband communication network to be converted, clarify the differences between the broadband communication network and the narrowband communication network to be converted, determine the bandwidth requirements for the target application, and choose to use broadband communication or narrowband communication based on the collected information;

[0007] (2) After the carrier communication signal is sent, the quality of the carrier communication signal sent by the broadband communication network and the narrowband communication network, as well as the noise environment around the power line, the data transmission requirements of the application scenario and the power line quality are detected by the detection module, and the broadband communication network and the narrowband communication network are flexibly converted based on the information detected by the detection module;

[0008] (3) After the broadband communication network or the narrowband communication network is converted, the interference between the converted broadband and narrowband communication network signals is detected. According to a preset value set in advance, if the interference to the converted communication network exceeds the preset value, the receiving end of the communication network before the conversion is turned off; if the interference to the converted communication network does not exceed the preset value, the receiving ends of the broadband communication network and the narrowband communication network are ensured to be normally turned on;

[0009] (4) After the carrier communication signal is converted into a wide-band or narrow-band communication network, the recording module is used to record the carrier communication signal at the conversion node. After repeated recording at the same node, the detection module can be bypassed and the carrier communication signal can be converted into a wide-band or narrow-band communication network in advance before the node to reduce the impact of the node on the carrier communication signal transmission.

[0010] As a further solution of the present invention, the broadband communication network is a communication technology with a wider bandwidth, supporting high-speed data transmission of more than 100kbps, and the narrowband communication network is a communication technology with a narrower bandwidth, supporting data transmission of tens of bps to several kbps. The transmission rate is low, but the anti-interference ability is strong and the coverage range is wide.

[0011] As a further solution of the present invention, the detection module includes a signal detection terminal, a noise detection terminal, an application scenario detection terminal and a power line quality detection terminal.

[0012] As a further solution of the present invention, the switching conditions of the narrowband communication network are poor signal quality, high noise environment, low data transmission requirements and poor power line quality, and the switching conditions of the broadband communication network are good signal quality, low noise environment, high data transmission requirements and stable power line quality.

[0013] As a further solution of the present invention, the broadband and narrowband communication network conversion includes a collector, a first signal collection port, a network data conversion device and a second signal collection port;

[0014] When the signal is sent, the high-speed carrier signal needs to be transmitted from the broadband communication network to the narrowband communication network. The data source high-speed carrier signal of the broadband communication network will be transmitted by the collector and then to the network data conversion device through the first signal transmission interface. Under the conversion of the network data conversion device, it becomes a low-speed carrier signal and is finally transmitted to the narrowband communication network through the transmission interface.

[0015] When the signal returns, the low-speed carrier signal needs to be transmitted from the narrowband communication network to the broadband communication network. The low-speed carrier signal of the narrowband communication network will be transmitted to the network data conversion device through the second signal transmission interface. After being converted by the network data conversion device, it becomes a high-speed carrier signal, and then transmitted out through the first signal transmission interface and passed through the conversion device to the broadband communication network.

[0016] As a further solution of the present invention, the method of closing the receiving end of the communication network before the conversion after the conversion of the wide-band and narrow-band communication network includes a switch filter and an automatic gain control system;

[0017] The switch filter can selectively enable or disable broadband and narrowband reception according to the frequency band range of the signal. In this case, the frequency ranges of broadband and narrowband reception are different. Therefore, by adjusting the working mode of the filter, the signal can be selected to pass through the broadband filter or the narrowband filter, and in different reception modes, the reception of the other mode is turned off.

[0018] As a further solution of the present invention, the automatic gain control system includes an automatic gain control circuit and a switch circuit;

[0019] The automatic gain control circuit can dynamically adjust the receiver gain according to the signal strength;

[0020] The switch circuit is used to switch between broadband and narrowband reception;

[0021] By monitoring the frequency and strength of the signal, the automatic gain control can trigger the switch to select the appropriate receiving bandwidth.

[0022] As a further solution of the present invention, the detection method of the interference between the wideband and narrowband communication network signals includes impedance matching and reflection coefficient measurement and spectrum analysis;

[0023] The impedance matching and reflection system measurement is based on the fact that impedance matching is the key to ensuring signal integrity and reducing interference. The reflection of communication signals is caused by the mismatch between source impedance and load impedance, which will lead to signal reflection, power loss and mutual interference.

[0024] As a further solution of the present invention, the spectrum analysis is based on a spectrum analyzer. Since the distribution of broadband and narrowband signals on the spectrum will affect the interference between them, the interference can be detected by the spectrum analyzer.

[0025] As a further solution of the present invention, the recording module includes a data acquisition script and a database storage;

[0026] The data collection script is based on a network monitoring tool to periodically obtain bandwidth and path data;

[0027] The data storage can store the collected network status and location data in a database.

[0028] Compared with the prior art, the advantages and positive effects of the present invention are:

[0029] In the present invention, by setting a preset value in advance, if the interference to the converted communication network exceeds the preset value, the receiving end of the communication network before the conversion is closed; if the interference to the converted communication network does not exceed the preset value, the receiving ends of the broadband communication network and the narrowband communication network are guaranteed to be opened normally, thereby reducing the frequent closing of the receiving ends of the broadband and narrowband communication networks, thereby improving communication efficiency and reducing delays and bit error rates.

[0030] In the present invention, by using a recording module to record at the conversion node when converting the wide-band and narrow-band communication networks, after repeated recording at the same node, the detection module can be bypassed and the carrier communication signal can be converted to a wide-band and narrow-band communication network in advance before the node, so as to reduce the impact of the node on the transmission of the carrier communication signal and ensure the efficiency and quality of the overall communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] See also Figure 1 The present invention provides a technical solution: a method for converting a wide-band or narrow-band communication network based on power line carrier communication, comprising the following steps:

[0034] (1) Collect information about the broadband communication network and narrowband communication network to be converted, clarify the differences between the broadband communication network and the narrowband communication network to be converted, determine the bandwidth requirements for the target application, and choose to use broadband communication or narrowband communication based on the collected information;

[0035] (2) After the carrier communication signal is sent, the quality of the carrier communication signal sent by the broadband communication network and the narrowband communication network, as well as the noise environment around the power line, the data transmission requirements of the application scenario and the power line quality are detected by the detection module, and the broadband communication network and the narrowband communication network are flexibly converted based on the information detected by the detection module;

[0036] (3) After the broadband communication network or the narrowband communication network is converted, the interference between the converted broadband and narrowband communication network signals is detected. According to the preset value set in advance, if the interference to the converted communication network exceeds the preset value, the receiving end of the communication network before the conversion is turned off. If the interference to the converted communication network does not exceed the preset value, the receiving ends of the broadband communication network and the narrowband communication network are ensured to be normally turned on, thereby reducing the frequent shutdown of the receiving ends of the broadband and narrowband communication networks, thereby improving communication efficiency and reducing delays and bit error rates;

[0037] (4) After the carrier communication signal is converted into a wide-band or narrow-band communication network, the recording module is used to record the carrier communication signal at the conversion node. After repeated recording at the same node, the detection module can be bypassed and the carrier communication signal can be converted into a wide-band or narrow-band communication network in advance before the node to reduce the impact of the node on the carrier communication signal transmission and ensure the efficiency and quality of the overall communication.

[0038] Broadband communication network is a communication technology with a wider bandwidth, supporting high-speed data transmission of more than 100kbps, and is suitable for large-volume data transmission. Common ones include PLC's medium-frequency or high-frequency carrier transmission. Narrowband communication network is a communication technology with a narrower bandwidth, supporting data transmission from tens of bps to several kbps. It has a lower transmission rate, but strong anti-interference ability and a wide coverage range. It is suitable for low-speed long-distance communication, such as low-frequency PLC communication.

[0039] The detection module includes a signal detection terminal, a noise detection terminal, an application scenario detection terminal and a power line quality detection terminal. The signal detection can use a spectrum analyzer, an oscilloscope and a vector signal analyzer to detect the carrier communication signal. The noise detection can use a power line noise detection system, cooperate with multiple sensors, data acquisition and analysis tools to realize real-time noise monitoring. The detection of application scenarios requires clarifying the application scenario's requirements for bandwidth, delay requirements and data communication volume requirements. The detection of power line quality is carried out using a power quality analyzer, a digital oscilloscope, a power quality monitor, and a voltage and current tester.

[0040] The switching conditions of narrowband communication networks are poor signal quality, high noise environment, low data transmission requirements and poor power line quality. If the signal quality of the power line network is poor, such as low SNR or high bit error rate, it is necessary to switch to narrowband mode. This mode has a smaller bandwidth, but can maintain a lower bit error rate and a more stable connection under poor signal quality. If there is strong noise interference in the environment, the influence of external noise can be effectively reduced by adopting narrowband communication mode. If the application scenario has a low bandwidth requirement, such as transmitting only a small amount of control signals or low-speed data, using narrowband mode can improve the reliability of the system. If the power line quality is poor, such as aging lines and loose connections, broadband mode may cause frequent disconnections or The communication is unstable, and you can switch to narrowband mode to maintain a more stable connection. The switching conditions of the broadband communication network are good signal quality, low noise environment, high data transmission requirements and stable power line quality. When the signal strength is high and the signal-to-noise ratio is good, you can choose broadband mode, which can provide higher data transmission rates and is suitable for application scenarios with high bandwidth requirements. If the noise in the power line environment is small, the broadband mode can effectively utilize a wider frequency band and provide faster data transmission rates. When a large amount of data needs to be transmitted or high-bandwidth applications are required, the broadband mode can better meet the high bandwidth requirements. If the power line quality is good, you can make full use of the broadband mode to obtain higher data rates and lower latency.

[0041] The broadband-narrowband communication network conversion includes a collector, a first signal collection port, a network data conversion device and a second signal collection port; when the data source is in the broadband communication network, when the signal is sent, the high-speed carrier signal needs to be transmitted from the broadband communication network to the narrowband communication network, and the data source high-speed carrier signal of the broadband communication network will be transmitted by the collector, and then transmitted to the network data conversion device through the first signal transmission interface, and under the conversion of the network data conversion device, it becomes a low-speed carrier signal, and finally transmitted to the narrowband communication network through the transmission interface. When the signal returns, the low-speed carrier signal needs to be transmitted from the narrowband communication network to the broadband communication network, and the low-speed carrier signal of the narrowband communication network will be transmitted to the network data conversion device through the second signal transmission interface, and in the network data conversion device After conversion, it becomes a high-speed carrier signal, and then it is transmitted through the first signal transmission interface, and then it passes through the conversion device to the broadband communication network. When the data source is in the narrowband communication network, the low-speed carrier signal needs to be transmitted from the narrowband communication network to the broadband communication network. The low-speed carrier signal in the narrowband communication network will reach the transmission interface through the conversion device and become a high-speed carrier signal, and then it is transmitted through the transmission interface and transmitted to the broadband communication network. When the signal returns, the high-speed carrier signal needs to be transmitted from the broadband communication network to the narrowband communication network. The high-speed carrier signal of the data source of the broadband communication network will be transmitted to the network data conversion device through the first signal, and become a low-speed carrier signal under the conversion of the network data conversion device, and is transmitted through the transmission interface to the narrowband communication network.

[0042] The method of closing the receiving end of the communication network before the conversion after the conversion of the wide-band and narrow-band communication network includes a switching filter and an automatic gain control system; the switching filter can selectively enable or disable broadband and narrowband reception according to the frequency band range of the signal. In this case, the frequency ranges of broadband and narrowband reception are different. Therefore, by adjusting the working mode of the filter, the signal can be selected to pass through the broadband filter or the narrowband filter, and in different receiving modes, the reception of the other mode is turned off. The principle is to select different filter configurations through electronic switches such as relays, FETs, PIN diodes, etc. When a broadband signal is received, the switch can disconnect the narrowband filter and pass the broadband signal at the same time. Conversely, when a narrowband signal needs to be received, it switches to the narrowband filter and turns off the broadband reception.

[0043] The automatic gain control system includes an automatic gain control circuit and a switching circuit. The automatic gain control circuit can dynamically adjust the receiver gain according to the signal strength. The switching circuit is used to switch between broadband and narrowband reception. By monitoring the frequency and strength of the signal, the automatic gain control can trigger the switch and select the appropriate receiving bandwidth. The principle is that the system determines whether the signal belongs to broadband or narrowband based on the characteristics of the input signal such as spectrum width or power, and controls the switching circuit to close unnecessary receiving paths. For example, when a broadband signal is received, the system can automatically close the narrowband channel, and vice versa.

[0044] The detection methods of interference between wide-band and narrow-band communication network signals include impedance matching and reflection coefficient measurement as well as spectrum analysis. Impedance matching and reflection system measurement are based on the fact that impedance matching is the key to ensuring signal integrity and reducing interference. The reflection of communication signals is caused by the mismatch between source impedance and load impedance, which will lead to signal reflection, power loss and mutual interference. If the reflection coefficient is close to zero, it indicates that the impedance matching is good and there is no significant reflection. If it is close to one, it indicates that there is a strong reflection, which may cause interference.

[0045] Spectrum analysis is based on spectrum analyzers. Since the distribution of broadband and narrowband signals on the spectrum will affect the interference between them, the interference can be detected through a spectrum analyzer. The spectrum analyzer can be used to observe the frequency distribution of the signal and check whether there is spectrum overlap or unnecessary frequency band interference. If the frequency ranges of broadband and narrowband signals overlap, intermodulation distortion, cross interference and other problems will occur.

[0046] The recording module includes data collection scripts and database storage. The data collection script is based on network monitoring tools and regularly obtains bandwidth and path data. Commonly used network monitoring tools include netflow, sFlow, ping, and traceroute. When the network undergoes a broadband to narrowband conversion, the script will automatically collect and record relevant data, including the specific node and time when the conversion occurs. The data storage can store the collected network status and location data in the database. Whenever the bandwidth is switched, a record can be inserted to record relevant information, such as device ID, bandwidth status, timestamp, network path, and node location.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for converting a wide-band to narrow-band communication network based on power line carrier communication, characterized in that: The method comprises the following steps: (1) Collect information about the broadband communication network and narrowband communication network to be converted, clarify the differences between the broadband communication network and the narrowband communication network to be converted, determine the bandwidth requirements for the target application, and choose to use broadband communication or narrowband communication based on the collected information; (2) After the carrier communication signal is sent, the detection module is used to detect the quality of the carrier communication signal sent by the broadband communication network and the narrowband communication network, as well as the noise environment around the power line, the data transmission requirements of the application scenario, and the power line quality. Based on the information detected by the detection module, the broadband communication network and the narrowband communication network are flexibly converted; (3) After the broadband communication network or narrowband communication network is converted, the interference between the converted broadband and narrowband communication network signals is detected. According to the preset value set in advance, if the interference to the converted communication network exceeds the preset value, the receiving end of the communication network before the conversion is turned off; if the interference to the converted communication network does not exceed the preset value, the receiving ends of the broadband communication network and the narrowband communication network are ensured to be normally turned on; (4) After the carrier communication signal is converted to a wide-band or narrow-band communication network, the recording module is used to record the carrier communication signal at the conversion node. After repeated recording at the same node, the detection module can be bypassed and the carrier communication signal can be converted to a wide-band or narrow-band communication network in advance before the node to reduce the impact of the node on the carrier communication signal transmission.

2. A method for converting a wide-band and narrow-band communication network based on power line carrier communication according to claim 1, characterized in that: The broadband communication network is a communication technology with a wider bandwidth, supporting high-speed data transmission of more than 100kbps. The narrowband communication network is a communication technology with a narrower bandwidth, supporting data transmission from tens of bps to several kbps. The transmission rate is lower, but the anti-interference ability is strong and the coverage is wide.

3. A method for converting a wide-band to narrow-band communication network based on power line carrier communication according to claim 2, characterized in that: The detection module includes a signal detection terminal, a noise detection terminal, an application scenario detection terminal and a power line quality detection terminal.

4. A method for converting a wide-band to narrow-band communication network based on power line carrier communication according to claim 2, characterized in that: The switching conditions of the narrowband communication network are poor signal quality, high noise environment, low data transmission demand and poor power line quality, and the switching conditions of the broadband communication network are good signal quality, low noise environment, high data transmission demand and stable power line quality.

5. The method for converting a wide-band to narrow-band communication network based on power line carrier communication according to claim 2, characterized in that: The broadband and narrowband communication network conversion includes a collector, a first signal collection port, a network data conversion device and a second signal collection port; When the signal is sent, the high-speed carrier signal needs to be transmitted from the broadband communication network to the narrowband communication network. The data source high-speed carrier signal of the broadband communication network will be transmitted by the collector and then to the network data conversion device through the first signal transmission interface. Under the conversion of the network data conversion device, it becomes a low-speed carrier signal and is finally transmitted to the narrowband communication network through the transmission interface. When the signal returns, the low-speed carrier signal needs to be transmitted from the narrowband communication network to the broadband communication network. The low-speed carrier signal of the narrowband communication network will be transmitted to the network data conversion device through the second signal transmission interface. After being converted by the network data conversion device, it becomes a high-speed carrier signal, and then transmitted out through the first signal transmission interface and passed through the conversion device to the broadband communication network.

6. A method for converting a wide-band to narrow-band communication network based on power line carrier communication according to claim 3, characterized in that: The method of closing the receiving end of the communication network before the conversion after the conversion of the wide-band and narrow-band communication network includes a switch filter and an automatic gain control system; The switch filter can selectively enable or disable broadband and narrowband reception according to the frequency band range of the signal. In this case, the frequency ranges of broadband and narrowband reception are different. Therefore, by adjusting the working mode of the filter, the signal can be selected to pass through the broadband filter or the narrowband filter, and in different reception modes, the reception of the other mode is turned off.

7. A method for converting a wide-band to narrow-band communication network based on power line carrier communication according to claim 6, characterized in that: The automatic gain control system comprises an automatic gain control circuit and a switch circuit; The automatic gain control circuit can dynamically adjust the receiver gain according to the signal strength; The switch circuit is used to switch between broadband and narrowband reception; By monitoring the frequency and strength of the signal, the automatic gain control can trigger the switch to select the appropriate receiving bandwidth.

8. The method for converting a wide-band to narrow-band communication network based on power line carrier communication according to claim 1, characterized in that: The detection method of interference between the wideband and narrowband communication network signals includes impedance matching and reflection coefficient measurement and spectrum analysis; The impedance matching and reflection system measurement is based on the fact that impedance matching is the key to ensuring signal integrity and reducing interference. The reflection of communication signals is caused by the mismatch between source impedance and load impedance, which will lead to signal reflection, power loss and mutual interference.

9. A method for converting a wide-band to narrow-band communication network based on power line carrier communication according to claim 8, characterized in that: The spectrum analysis is based on a spectrum analyzer. Since the distribution of broadband and narrowband signals on the spectrum will affect the interference between them, the interference can be detected by the spectrum analyzer.

10. The method for converting a wide-band to narrow-band communication network based on power line carrier communication according to claim 4, characterized in that: The recording module includes data acquisition scripts and database storage; The data collection script is based on a network monitoring tool to periodically obtain bandwidth and path data; The data storage can store the collected network status and location data in a database.

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