Illuminating lamp data transmission system

Abstract

The invention is suitable for the technical field of data processing, and provides an illumination lamp data transmission system, which comprises a plurality of illumination lamps, a plurality of PLC concentrators respectively connected with the illumination lamps on an electric power circuit in a region where the illumination lamps are located, LPWAN gateways connected with the PLC concentrators, and a monitoring center communicating with the LPWAN gateways through an LPWAN network. The lighting lamp is provided with a data acquisition module and a PLC module; the PLC concentrator is provided with a modulation-demodulation module, an error detection module and a data forwarding module; the LPWAN gateway is provided with a data coding module, a data packaging module and an LPWAN communication module; the monitoring center comprises a data receiving module, a decoding processing module and a data processing module. The problem that an existing lighting lamp is poor in data transmission signal stability in a special environment where communication is inconvenient is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to a lighting fixture data transmission system. Background Art

[0002] In special environments such as mines, as production safety standards improve, the role of lighting fixtures is no longer limited to providing basic lighting. In order to ensure the safety of underground operations, lighting fixtures must be integrated with data transmission functions to monitor various parameters of the mine environment (such as air quality, temperature and humidity, personnel positioning, etc.) in real time, so as to effectively prevent potential dangers.

[0003] However, mine environments are generally characterized by high humidity, high dust, and complex electromagnetic interference, which results in the inability of traditional wireless communication technologies (such as Wi-Fi, Bluetooth, etc.) to provide reliable and stable communication links in such scenarios. This environmental characteristic places higher demands on data transmission, especially stability, coverage, and anti-interference capabilities.

[0004] In addition, current mines are usually widely distributed, with numerous lighting nodes and complex layouts. Traditional wireless communication systems are prone to problems such as signal attenuation, data packet loss and delay when used in a large range of applications. It is difficult to meet the needs of real-time data transmission in special environments such as mines and underground spaces, and has failed to effectively solve the problems of real-time data transmission and large-scale stable coverage. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a lighting fixture data transmission system to fundamentally solve the problem of poor stability of data transmission signals of existing lighting fixtures in special environments where communication is inconvenient.

[0006] A lighting fixture data transmission system according to an embodiment of the present invention includes a plurality of lighting fixtures, a plurality of PLC hubs respectively connected to the lighting fixtures on the power lines in the area, LPWAN gateways connected to the PLC hubs, and a monitoring center communicating with the LPWAN gateways through the LPWAN network;

[0007] The lighting fixture is provided with a data acquisition module and a PLC module, wherein the data acquisition module is used to collect various parameter data of the environment and the working state of the lighting fixture, and the PLC module is used to encode and modulate the parameter data collected by the data acquisition module and then load it onto the power line for transmission, wherein the various parameter data include environmental parameter data and working parameter data;

[0008] The PLC hub is provided with a modulation and demodulation module, an error detection module and a data forwarding module. The modulation and demodulation module is used to receive the modulation signals sent by multiple lighting fixtures from the power line, demodulate and restore them into the original various parameter data. The error detection module is used to verify the integrity of the various parameter data after demodulation. The data forwarding module is used to forward the various parameter data after demodulation and verification to the LPWAN gateway.

[0009] The LPWAN gateway is provided with a data encoding module, a data packaging module and a LPWAN communication module. The data encoding module is used to re-encode the parameter data received from the PLC hub into data adapted to the LPWAN network transmission protocol. The data packaging module is used to package the encoded data. The LPWAN communication module is used to send the packaged data to the monitoring center via the LPWAN network.

[0010] The monitoring center includes a data receiving module, a decoding processing module and a data processing module. The data receiving module is used to receive packaged data from each LPWAN gateway through the LPWAN network. The decoding processing module is used to decode the received packaged data and restore it into various parameter data of the lighting fixture. The data processing module is used to analyze the various parameter data of the lighting fixture and determine the working status and environmental status of the lighting fixture.

[0011] In addition, a lighting fixture data transmission system according to the above embodiment of the present invention may also have the following additional technical features:

[0012] Furthermore, the PLC module comprises:

[0013] A data encoding unit, used for encoding the collected parameter data into digital signal data;

[0014] A signal modulation unit, used to convert the encoded digital signal data into a signal transmitted on the power line, and to transmit the modulated signal by superimposing it on the current in the power line;

[0015] The channel monitoring unit is used to monitor the channel status of the power line and control the signal modulation unit to dynamically adjust the modulation mode and frequency selection according to the monitored channel status of the power line.

[0016] Furthermore, the PLC module also includes:

[0017] The carrier sensing unit is used to monitor whether there are signals sent by other lighting fixtures on the power line, and when it is detected that the power line is idle, it controls the signal modulation unit to transmit the modulated signal on the power line.

[0018] Furthermore, the PLC module also includes:

[0019] The multi-channel transmission unit is used to control the signal modulation unit to dynamically adjust the modulation mode and frequency selection of different parameter data according to the channel status of the power line monitored by the channel monitoring unit and the priority of various parameter data in the lighting fixture.

[0020] Furthermore, the data forwarding module includes:

[0021] A data cache unit, used for caching various parameter data received from a plurality of lighting fixtures;

[0022] A data transmission unit, used to send the demodulated and verified parameter data to the LPWAN gateway;

[0023] The priority management unit is used to control the order in which the data transmission unit sends various parameter data according to the priorities assigned to the various parameter data in the lighting fixture.

[0024] Furthermore, the LPWAN communication module includes:

[0025] A sending unit, used for sending the packaged data to a monitoring center via a LPWAN network;

[0026] A signal optimization unit, which is used to dynamically adjust the transmission power and rate based on real-time monitoring of the transmission conditions of the LPWAN network;

[0027] The data packet optimization unit is used to dynamically adjust the data packet size based on real-time monitoring of the network load and signal strength of the LPWAN network.

[0028] Furthermore, the monitoring center also includes an early warning module and a remote control module. The early warning module is used to generate an alarm message when it detects that various parameter data of the lighting fixture exceeds the corresponding set threshold value. The remote control module is used to generate a control instruction according to the data analysis result or according to the manual setting of the user, and send the control instruction to the LPWAN gateway through the LPWAN network;

[0029] The LPWAN communication module also includes a receiving unit for receiving downlink control instructions from the monitoring center, decoding and transmitting them to the PLC hub;

[0030] The PLC hub also includes a control signal processing module for receiving control instructions transmitted by the LPWAN gateway, and controlling the modulation and demodulation module to encode and modulate the control instructions and then load them onto the power line for transmission;

[0031] The PLC module is also used to receive the modulated signal sent by the PLC hub from the power line, demodulate and restore it into the original control instruction, and control the lighting fixture according to the control instruction.

[0032] Furthermore, the channel monitoring unit includes:

[0033] A signal analysis subunit is used to analyze the signal quality information in the power line in real time, and control the signal modulation unit to dynamically adjust the frequency selection and modulation mode according to the signal quality information, wherein the signal quality information includes the interference frequency band, signal strength and bit error rate;

[0034] The channel estimation subunit is used to estimate the channel characteristics of the power line and control the signal modulation unit to dynamically adjust the modulation mode according to the channel estimation result. The channel characteristics include path loss, multipath effect and noise distribution.

[0035] Furthermore, the data acquisition module includes:

[0036] Temperature and humidity sensors are used to collect temperature and humidity data of the environment where the lighting fixtures are located;

[0037] Gas concentration sensor, used to collect gas concentration data in the air of the environment where the lighting fixture is located;

[0038] Voltage and current acquisition module, used to collect voltage and current data when the lighting fixture is working;

[0039] The lamp status collection module is used to collect the working status data of the lighting fixtures, including the switch status, light intensity, operating time and fault information.

[0040] The lighting fixture data transmission system provided by the embodiment of the present invention integrates a PLC module in the lighting fixture so that the parameter data of the lighting fixture can be transmitted through the existing power line without laying additional communication lines, thereby reducing the wiring cost; through the modulation and demodulation module and the error detection module in the PLC hub, it is ensured that the parameter data transmitted from the lighting fixture can be accurately demodulated and verified, avoiding data loss or erroneous transmission caused by channel noise, signal interference and other problems, ensuring the reliability of data transmission, and being suitable for complex electromagnetic environments in special environments such as mines where communication is inconvenient; through the LPWAN gateway, long-distance data transmission from the PLC hub to the monitoring center is realized, wherein the LPWAN network has the characteristics of long distance and low power consumption, and is suitable for monitoring data transmission in special environments such as mines and tunnels with a wide coverage, ensuring reliable data transmission to the monitoring center, solving the problem of insufficient data coverage over a large area, and ensuring effective data transmission in complex environments; through the monitoring center, various parameter data from the lighting fixture are received and analyzed in real time, and the working status and environmental status of the lighting fixture are judged in time, ensuring the timeliness and effectiveness of data processing, and solving the problem of poor stability of data transmission signals of existing lighting fixtures in special environments with inconvenient communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a structural diagram of a lighting fixture data transmission system in a first embodiment of the present invention;

[0042] The following specific implementations will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0043] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0046] Embodiment 1

[0047] See also Figure 1 , shown is a lighting fixture data transmission system in a first embodiment of the present invention. For ease of explanation, only the parts related to the embodiment of the present invention are shown. The lighting fixture data transmission system provided by the embodiment of the present invention includes a plurality of lighting fixtures 1, a plurality of PLC hubs 2 respectively connected to the lighting fixtures on the power lines in the area, LPWAN gateways 3 connected to the PLC hubs, and a monitoring center 4 communicating with the LPWAN gateways through the LPWAN network;

[0048] The lighting fixture is provided with a data acquisition module 11 and a PLC module 21. The data acquisition module is used to collect various parameter data of the environment and the lighting fixture when it is working. The PLC module is used to encode and modulate the parameter data collected by the data acquisition module and then load it to the power line for transmission. The various parameter data include environmental parameter data and working parameter data.

[0049] The PLC hub is provided with a modulation and demodulation module 21, an error detection module 22 and a data forwarding module 23. The modulation and demodulation module is used to receive the modulation signals sent by multiple lighting fixtures from the power line, demodulate and restore them into the original various parameter data. The error detection module is used to verify the integrity of the various parameter data after demodulation. The data forwarding module is used to forward the various parameter data after demodulation and verification to the LPWAN gateway.

[0050] The LPWAN gateway is provided with a data encoding module 31, a data packaging module 32 and a LPWAN communication module 33. The data encoding module is used to re-encode the parameter data received from the PLC hub into data adapted to the LPWAN network transmission protocol. The data packaging module is used to package the encoded data. The LPWAN communication module is used to send the packaged data to the monitoring center via the LPWAN network.

[0051] The monitoring center includes a data receiving module 41, a decoding processing module 42 and a data processing module 43. The data receiving module is used to receive packaged data from each LPWAN gateway through the LPWAN network. The decoding processing module is used to decode the received packaged data and restore it into various parameter data of the lighting fixture. The data processing module is used to analyze the various parameter data of the lighting fixture and determine the working status and environmental status of the lighting fixture.

[0052] Among them, in one embodiment of the present invention, the lighting fixture data transmission system is applied to special environments such as mines and tunnels where communication is inconvenient, wherein the lighting fixture data transmission system includes multiple lighting fixtures, multiple PLC (Power Line Communication) hubs, multiple LPWAN (Low Power Wide Area Network) gateways, and a monitoring center. Among them, each lighting fixture is distributed in each area of ​​the special environment such as the mine and tunnel where it is applied. At this time, lighting fixtures at different locations may be distributed in a larger area, so it is impossible for all lighting fixtures to be connected to the same PLC hub. In order to achieve efficient data transmission, lighting fixtures are usually divided into multiple areas according to the geographical location and the layout of power lines, and each area has a corresponding PLC hub. At this time, the lighting fixtures in each area transmit data to their corresponding PLC hubs through the power lines. In other words, each lighting fixture only needs to transmit data to the nearest PLC hub on the power line in its area, without the need for cross-regional transmission. It should be pointed out that the distribution and number of PLC hubs depend on the scale of special environments such as mines and tunnels and the topology of power lines, which are not specifically limited here. Furthermore, each PLC hub is connected to the corresponding LPWAN gateway, and each LPWAN gateway communicates with the monitoring center through the LPWAN network, so that each PLC hub can transmit the data of each lighting fixture in the area received through the power line to the corresponding LPWAN gateway, and transmit the data to the monitoring center through the LPWAN gateway.

[0053] Furthermore, in one embodiment of the present invention, each lighting fixture is provided with a data acquisition module and a PLC module, wherein the data acquisition module is responsible for real-time acquisition of various parameter data of the environment and the lighting fixture when it is working, wherein the various parameter data include environmental parameter data such as ambient temperature, humidity, gas concentration, and working parameter data such as voltage, current, and working state of the lighting fixture. Specifically, in the embodiment of the present invention, the data acquisition module includes: a temperature and humidity sensor for acquiring temperature and humidity data of the environment in which the lighting fixture is located; a gas concentration sensor for acquiring gas concentration data in the air of the environment in which the lighting fixture is located; a voltage and current acquisition module for acquiring voltage and current data of the lighting fixture when it is working; and a lamp status acquisition module for acquiring working state data of the switch state, light intensity, operating time, and fault information of the lighting fixture.

[0054] Further, the PLC module receives various parameter data from the data acquisition module, first encodes the various parameter data, wherein the encoded data is loaded into the power line for transmission through modulation technology, that is, the PLC module transmits the data through the power line through the power line technology. Specifically, in one embodiment of the present invention, the PLC module includes:

[0055] A data encoding unit, used for encoding the collected parameter data into digital signal data;

[0056] A signal modulation unit, used to convert the encoded digital signal data into a signal transmitted on the power line, and to transmit the modulated signal by superimposing it on the current in the power line;

[0057] The channel monitoring unit is used to monitor the channel status of the power line and control the signal modulation unit to dynamically adjust the modulation mode and frequency selection according to the monitored channel status of the power line.

[0058] Among them, the data encoding unit receives various parameter data of the data acquisition module, performs encoding conversion, and generates a digital signal suitable for power line transmission. Specifically, the collected parameter data is usually input into the data encoding unit of the PLC module in the form of an analog signal. These analog signals are converted into digital data through an analog-to-digital converter (ADC). The digital data is compressed and optimized by a coding algorithm. Among them, the coding method can be selected from Huffman coding, differential pulse code modulation (DPCM) or convolution coding. These coding methods can be used to reduce the redundancy of data transmission, while improving transmission efficiency and data reliability, and ensuring the efficiency of transmission on the power line. Finally, the encoded digital data is packaged into a fixed-length data frame, which is suitable for the subsequent signal modulation process.

[0059] The signal modulation unit converts the digital signal output by the data encoding unit into a carrier signal suitable for transmission in the power line through a modulation method, and loads the signal on the current for transmission through the carrier superposition technology. Specifically, after the data frame enters the signal modulation unit, the digital signal is converted into an analog signal suitable for transmission in the power line environment by using modulation technologies such as orthogonal frequency division multiplexing (OFDM) or frequency shift keying (FSK). OFDM modulation effectively resists power line noise and attenuation problems by dividing the data into multiple subcarriers, each subcarrier corresponding to a different frequency. The modulated signal is superimposed on the current of the power line through the carrier superposition technology, so that the signal and power share the same physical transmission medium. In this process, the modulated signal is loaded into the power line through a coupler.

[0060] Among them, the channel monitoring unit monitors the channel status of the power line in real time, including parameters such as noise, interference frequency band, signal strength and bit error rate, and adjusts the modulation mode and frequency selection of the signal modulation unit according to these parameters to ensure stable transmission of the signal in a complex power environment. Specifically, the channel monitoring unit periodically samples the signal quality by placing a sampling module on the power line. The sampled data includes channel noise level, interference frequency band, signal strength and bit error rate. The sampling module analyzes the channel status of the current power line in real time. If high interference or channel blocking is detected, the channel monitoring unit will feed back the analysis results to the signal modulation unit. The channel monitoring unit controls the signal modulation unit to dynamically adjust the frequency range and modulation mode used according to the monitored channel status. The signal modulation unit dynamically adjusts the modulation mode and frequency in different environments to adapt to the interference that may exist in the power line. When the signal strength decreases or the interference increases, the signal modulation unit reduces the modulation rate or selects a more anti-interference modulation mode (for example, switching from OFDM to FSK). In the case of high bit error rate, the channel monitoring unit can also trigger the signal modulation unit to enable the forward error correction (FEC) mechanism to reduce the possibility of data loss. At the same time, the channel monitoring unit adjusts the frequency hopping technology according to the real-time monitoring results to avoid being in the noise or interference frequency band for a long time, thereby enhancing the robustness of the transmission. Specifically, during OFDM modulation, multiple subcarrier frequencies can be dynamically selected according to the frequency characteristics of the circuit line, while during FSK modulation, the carrier frequency is changed according to the current channel conditions.

[0061] Therefore, in the PLC module, the data encoding unit converts the various parameter data collected by the data acquisition module into digital signals suitable for transmission, and passes them to the signal modulation unit. The signal modulation unit selects the appropriate modulation mode (such as OFDM, FSK) and frequency according to the control of the channel monitoring unit, modulates the digital signal into a carrier signal that can be transmitted on the power line, and transmits it through the power line, wherein the channel monitoring unit continuously monitors the channel status and dynamically adjusts the parameters of the signal modulation unit to ensure the transmission stability under different channel conditions. Through the coordinated work of the above-mentioned module units, the PLC module can effectively adapt to the complex environment of the power line and realize efficient and stable signal transmission, which is suitable for scenarios with high requirements for data transmission reliability in special environments such as mines and tunnels.

[0062] Furthermore, in one embodiment of the present invention, the PLC module further includes: a carrier sensing unit, which is used to monitor whether there are signals sent by other lighting fixtures on the power line, and when it is detected that the power line is idle, the signal modulation unit is controlled to transmit the modulated signal on the power line. Specifically, the carrier sensing unit monitors the channel state of the power line, and determines whether there are PLC modules of other lighting fixtures that are transmitting signals through an energy detection method or a signal pattern matching method. By monitoring and judging the busy and idle states of the power line, multiple devices are prevented from sending signals at the same time, causing conflicts and interference. When the power line is idle, the carrier sensing unit controls the signal modulation unit to start signal modulation and load the signal onto the power line for transmission. When the power line is busy, the carrier sensing unit controls the signal modulation unit to enter a waiting mode, and uses a random backoff mechanism to prevent multiple lighting fixtures from transmitting at the same time. At the same time, during the data transmission process, the carrier sensing unit continuously monitors the power line state to ensure that the power line remains idle, and can interrupt the transmission when necessary to avoid conflicts.

[0063] More specifically, the carrier sensing unit continuously monitors the signal frequency band on the power line through a detection module. The detection module can use time domain analysis and frequency domain analysis to determine whether there are other devices on the line transmitting signals. Specifically, the energy detection method or the preset signal pattern matching method can be used to detect whether there is signal transmission. The energy detection method determines whether there is a carrier signal by analyzing the signal strength of different frequency bands on the power line. If there is signal transmission on the power line, the detected energy will exceed the preset threshold. The signal pattern matching method is that the detection module demodulates and analyzes the signal on the power line, and when it detects that the signal conforms to the preset transmission format or a specific frequency mode, it is determined that there are other devices on the line transmitting data. At this time, if the carrier sensing unit detects that there are other lighting fixtures on the power line sending signals, the signal modulation unit is controlled to enter the waiting mode, that is, the signal sending operation is temporarily not performed until the power line is idle. In the waiting mode, the carrier sensing unit continuously monitors the channel state. When it is detected that the signal on the power line ends (the energy or pattern matching detection is lower than the set threshold), it is determined that the power line is idle. Further, in a complex environment, there may be multiple lighting fixtures waiting for the line to be idle. In order to avoid channel contention conflicts, a random backoff mechanism (similar to the backoff algorithm in the CSMA / CA mechanism) is introduced. Specifically, after detecting that the power line is idle, the PLC module of each lighting fixture does not start transmission immediately, but waits for a random time interval to reduce the possibility of multiple lighting fixtures starting transmission at the same time. The time interval can be dynamically adjusted according to the number of lighting fixtures on the power line. When the carrier sensing unit determines that the power line is idle, it sends a control signal to the signal modulation unit to control the signal modulation unit to modulate the signal and start transmission. At this time, the signal modulation unit modulates the digital signal data to be sent into a carrier signal according to a predetermined modulation method (such as OFDM or FSK), and transmits it superimposed on the power line current. The carrier sensing unit still monitors the power line during the signal transmission process. When channel interference occurs or other lighting fixtures occupy the channel, the carrier sensing unit can detect and send an interrupt instruction in time to stop the modulation and transmission of the current signal. Therefore, through the real-time sensing mechanism of the carrier sensing unit, the system can avoid long-term signal conflicts and improve the stability of the overall network transmission. Through the above implementation, the carrier sensing unit can effectively solve the signal conflict problem that may be encountered in power line communication, ensuring that multiple lighting fixtures can efficiently transmit data when sharing a power line, thereby improving the communication stability and efficiency of the system.

[0064] Furthermore, in one embodiment of the present invention, the channel monitoring unit includes:

[0065] The signal analysis subunit is used to analyze the signal quality information in the power line in real time, and control the signal modulation unit to dynamically adjust the frequency selection and modulation mode according to the signal quality information. The signal quality information includes the interference frequency band, signal strength and bit error rate;

[0066] The channel estimation subunit is used to estimate the channel characteristics of the power line and control the signal modulation unit to dynamically adjust the modulation mode according to the channel estimation result. The channel characteristics include path loss, multipath effect and noise distribution.

[0067] Specifically, the signal analysis subunit collects signal quality information in the power line and determines the quality of the current channel in real time. The signal quality information includes indicators such as interference frequency band, signal strength and bit error rate. For the interference frequency band, the signal analysis subunit detects which frequency bands on the power line are occupied or interfered by the signal of the lighting fixture. If there is interference on a certain frequency band, the signal analysis subunit will mark the frequency band as an interfered frequency band to prevent it from being used during data transmission. For signal strength, the signal analysis subunit can determine the strength of the current signal by detecting the power of the transmission signal. If the signal strength of a certain line is too low, it means that the frequency band may be subject to greater interference or the line attenuation is too large. For the bit error rate, the signal analysis subunit monitors the error rate in data transmission, that is, the bit error rate. If the bit error rate increases, it means that the channel quality of the frequency band is poor, and the frequency or modulation method may need to be adjusted to ensure the accuracy of the data. At this time, according to the obtained signal quality information, the signal analysis subunit feeds back to the signal modulation unit in real time to control it to adjust the frequency selection of the transmission signal. If interference is detected on the current transmission frequency, the signal analysis subunit will guide the modulation unit to switch to a relatively idle frequency band. The interference of different frequency channels in the power line may change at any time. The signal analysis subunit can dynamically monitor these changes and ensure the timeliness of frequency adjustment to avoid data transmission obstruction. In addition to adjusting the frequency, the signal analysis subunit will also adjust the modulation method according to the real-time signal strength and bit error rate of the channel. When the signal strength is weak or the bit error rate is high, the signal analysis subunit will control the modulation unit to switch the modulation method from a high-efficiency but high-channel requirement method (such as QPSK) to a more robust but less efficient method (such as BPSK), thereby reducing the complexity of the modulation method and increasing the anti-interference ability. Through this dynamic adjustment of the modulation method, the system can prioritize the accuracy of data transmission when the channel state is poor, rather than pursuing the rate.

[0068] The channel estimation subunit estimates the transmission characteristics of the current channel by estimating the channel characteristics of the power line, and guides the selection and adjustment of the modulation mode of the signal modulation unit according to these estimation results. The channel characteristics include path loss, multipath effect and noise distribution, wherein the path loss reflects the attenuation of the signal when it is transmitted on the power line; the multipath effect is that the signal in the power line may be transmitted along multiple paths due to reflection and other reasons, which will affect the reception quality of the signal; the noise distribution is to estimate the noise level in the current power line, so as to judge the interference of the channel. The channel estimation subunit usually adopts an adaptive algorithm to estimate the channel characteristics of the power line according to the received known signal (such as synchronization signal or pilot signal). At this time, according to the channel estimation result of the channel estimation subunit, the current channel characteristics of the power line can be understood. When the channel estimation subunit detects that the channel characteristics are deteriorated (such as increased signal attenuation or increased noise level), the control signal modulation unit switches to a modulation mode with stronger noise resistance (such as BPSK) to ensure that the data can still be transmitted stably in a complex channel environment. On the contrary, when the channel condition is good (such as small attenuation and low noise level), the control signal modulation unit uses a more efficient modulation method (such as QPSK) to increase the data transmission rate. Through the above implementation, the channel monitoring unit can efficiently and real-time monitor the channel status of the power line, and dynamically adjust the modulation method and frequency selection of signal transmission, thereby ensuring the stability and reliability of data transmission, especially in a complex power line transmission environment.

[0069] Furthermore, in one embodiment of the present invention, the PLC module further includes:

[0070] The multi-channel transmission unit is used to control the signal modulation unit to dynamically adjust the modulation mode and frequency selection of different parameter data according to the channel status of the power line monitored by the channel monitoring unit and the priority of various parameter data in the lighting fixture. The channel monitoring unit monitors the channel status of the power line in real time, including signal strength, interference frequency band and bit error rate. The multi-channel transmission unit is responsible for dynamically selecting appropriate transmission channels (frequency, modulation mode, etc.) for different parameter data according to the channel status information provided by the channel monitoring unit and the priority of different parameter data. It ensures that important data can be transmitted first when the power line is interfered or the bandwidth is limited, and by selecting different modulation modes and frequencies to adapt to the current channel status, the stability and reliability of data transmission are guaranteed.

[0071] Specifically, the channel monitoring unit monitors the channel characteristics of the power line in real time, including signal strength, interference frequency band, bit error rate, etc. Through the above monitoring results, the multi-channel transmission unit can grasp the quality of the current channel. The channel information output by the channel monitoring unit can be divided into multiple indicators, such as the signal strength indicating the current signal quality on the power line; the interference frequency band indicating the frequency range where interference currently exists; and the bit error rate representing the error rate of data transmission on the current channel. Through these channel indicators, the multi-channel transmission unit can determine which frequency bands on the current power line are suitable for data transmission, and which frequency bands are interfered with or of poor quality. At the same time, the parameter data of the lighting fixture is classified according to priority, which is usually divided into high priority data, medium priority data, and low priority data, wherein high priority data includes fault information of lighting fixtures, etc. It is crucial to the operation of the system and needs to ensure low latency and high reliability. The medium priority data includes working status data such as the switch status of the lighting fixture, light intensity, or voltage and current data, which can be accepted within a certain time delay. The low priority data includes temperature and humidity data, gas concentration data, which do not affect the operation of the system even if there is a slight delay. Based on these priority information, the multi-channel transmission unit gives priority to ensuring that high-priority data is transmitted under good channel conditions. Specifically, it includes dynamically adjusting the modulation mode and dynamically adjusting the frequency selection, where the modulation mode can include multiple types, such as QPSK (quadrature phase shift keying), BPSK (bi-phase shift keying) and OFDM (orthogonal frequency division multiplexing), among which QPSK is suitable for high-quality channels and can provide a higher transmission rate. BPSK is suitable for channels with large interference. Although the rate is low, the reliability is higher. OFDM is suitable for power lines with severe multipath interference. It can transmit different data streams in parallel in multiple sub-bands to improve anti-interference capabilities. The multi-channel transmission unit will give priority to using efficient modulation methods (such as QPSK) for high-priority data according to the channel monitoring results. When the channel quality is poor, the high-priority data will be automatically switched to a more reliable but lower-speed modulation method (such as BPSK) to ensure that the data can be transmitted stably. At the same time, different frequency channels of the power line may be interfered to varying degrees. The multi-channel transmission unit dynamically selects the frequency channel that is not interfered with according to the interference frequency band information provided by the channel monitoring unit. Specifically, before transmission, the multi-channel transmission unit obtains information about the interference frequency band and signal strength from the channel monitoring unit. If the currently used frequency is interfered with, the multi-channel transmission unit automatically switches to an uninterrupted backup frequency band. For high-priority data, it is preferentially allocated to the frequency band with the least interference and the strongest signal to ensure reliable transmission. For low-priority data, it is allowed to use a relatively interfered frequency band for transmission, thereby ensuring the overall transmission efficiency of the system.Furthermore, when the channel status of the power line is not good, the multi-channel transmission unit will give priority to the transmission of high-priority data, while the medium and low priority data can be temporarily delayed for transmission, or allocated to suboptimal channels. When the channel status is good, the multi-channel transmission unit can use multiple frequency bands to simultaneously transmit different types of parameter data. For example, high priority data can be transmitted on one frequency band, while medium priority data can be transmitted on another frequency band. Therefore, through the above implementation, the multi-channel transmission unit can dynamically adapt to the complex channel status of the power line, ensuring that parameter data of different priorities are transmitted under the corresponding channel conditions, thereby improving the stability and efficiency of the entire lighting fixture data transmission system.

[0072] Furthermore, in one embodiment of the present invention, the PLC hub is provided with a modulation and demodulation module, an error detection module and a data forwarding module, wherein the modulation and demodulation module receives the modulation signals sent by multiple lighting fixtures by monitoring the signals on the power line. Since the signals sent by each lighting fixture may use different frequencies or modulation methods, the modulation and demodulation module needs to have compatibility with different frequencies and modulation types. The modulation and demodulation module uses the corresponding demodulation algorithm to demodulate the signal into various original parameter data according to the received modulation signal, wherein the commonly used demodulation methods generally include frequency shift keying (FSK) demodulation and phase shift keying (PSK) demodulation, wherein frequency shift keying (FSK) demodulation is applicable to signals that transmit data through frequency changes; and phase shift keying (PSK) demodulation is applicable to signals that transmit data through phase changes. After the modulation and demodulation module performs demodulation, the original various parameter data are recovered from the power line and processed in the form of digital data.

[0073] Furthermore, the error detection module verifies the integrity of the demodulated data to ensure that no errors occur during data transmission. When the lighting fixture sends data, each data packet is usually accompanied by a check code (such as a CRC code or a checksum). After the modulation and demodulation module demodulates the data, the error detection module extracts and calculates the check code of the received data packet, and compares the check code of the received data packet with the check code of the original data. If the two are consistent, it indicates that no error occurred during data transmission; if they are inconsistent, it indicates that there is an error in the data transmission. If the error detection module finds that an error has occurred in the data packet, it can start the retransmission mechanism. At this time, the PLC hub sends a request to the sending lighting fixture to request it to resend the data packet; or mark the data packet as invalid, discard the data packet, and wait for the next data cycle to be transmitted. This error handling mechanism ensures that the reliability of the data can be guaranteed even in a complex power line transmission environment.

[0074] Furthermore, the data forwarding module sends the various parameter data after verification and demodulation to the LPWAN gateway, thereby realizing further transmission of data. In one embodiment of the present invention, the data forwarding module includes: a data cache unit for caching various parameter data received from multiple lighting fixtures; a data transmission unit for sending the demodulated and verified parameter data to the LPWAN gateway; and a priority management unit for controlling the order in which the data transmission unit sends various parameter data according to the priorities assigned to the various parameter data in the lighting fixtures. Specifically, the parameter data received from multiple lighting fixtures are stored in the data cache unit after passing through the modulation and demodulation module and the error detection module. The priority management unit prioritizes the data in the cache and determines the sending order. The data transmission unit takes out the data from the cache according to the sorting result, packages it, and sends the data to the LPWAN gateway regularly. If the data transmission is unsuccessful, the data transmission unit ensures the integrity of the data through a retransmission mechanism to ensure that the LPWAN gateway receives all important parameter data.

[0075] Specifically, the data cache unit temporarily stores the parameter data received from multiple lighting fixtures for subsequent processing and forwarding, wherein the data cache unit adopts a first-in-first-out (FIFO) queue structure or a ring buffer to efficiently store the received data. At the same time, the data cache unit sets a maximum cache capacity. If the upper limit is reached, the least important or oldest data is discarded according to the priority or timestamp strategy to ensure the real-time performance of the system. When caching data, the data cache unit also formats different types of parameter data to ensure that they are stored in a consistent format so that the subsequent data transmission unit can recognize and process them.

[0076] Among them, the data transmission unit sends the demodulated and verified parameter data received from the data cache unit to the LPWAN gateway. The specific data transmission unit sets a timing trigger to regularly check the data in the data cache unit. By polling or event-driven methods, it is decided when to send data to the LPWAN gateway. When preparing to send data, the data transmission unit will take out the data from the cache and package it, which may include information such as the type, source, and timestamp of the parameter data. After the data is packaged, the data transmission unit sends the packaged data to the LPWAN gateway. To improve reliability, the data transmission unit can implement a confirmation mechanism and wait for ACK (confirmation response) after sending the data. If ACK is not received, it will retransmit.

[0077] Among them, the priority management unit controls the order in which the data transmission unit sends data according to the priority of various parameter data in different lighting fixtures to ensure that important data can be processed first. In the data collection stage, various parameter data in the lighting fixture will be assigned a priority value according to their importance (for example, the priority of voltage and current data is higher than that of temperature and humidity data). The priority management unit will regularly check the data in the data cache unit and sort them according to the priority of each data. Specifically, a sorting algorithm (such as quick sort or merge sort) can be used to implement the sorting process. The data transmission unit determines the order of sending parameter data according to the priority sorting result, and gives priority to sending parameter data with high priority. It should be pointed out that in some cases, the priority management unit can dynamically adjust the priority according to the real-time monitored environmental conditions (such as excessive gas concentration, abnormal temperature, etc.) or the working conditions of the lighting fixture (such as overvoltage, overcurrent, etc.), for example, the priority of a certain parameter data is increased to ensure that the relevant parameter data can be sent in time in an emergency. Therefore, in the above implementation, the cache mechanism and priority management are used to ensure that important data can be processed and sent in time. The integrity and accuracy of the data during the transmission process are guaranteed by the error detection and retransmission mechanism. By dynamically adjusting the priority of data transmission according to real-time environmental changes, the system can respond effectively in different situations.

[0078] Further, in one embodiment of the present invention, the LPWAN gateway is provided with a data encoding module, a data packaging module and a LPWAN communication module. The data encoding module re-encodes the parameter data received from the PLC hub to comply with the transmission protocol of the LPWAN network. The specific data encoding module receives the parameter data from the PLC hub through an interface, and defines data encoding rules according to the protocol of the LPWAN network (such as LoRaWAN, NB-IoT, etc.), which include data format, byte order, compression algorithm, etc. The received parameter data is converted into a format suitable for LPWAN network transmission using an encoding algorithm. Specifically, the encoding process includes data type conversion, compression processing and data verification, wherein data type conversion is to convert different data types into byte format. Compression processing is to use a compression algorithm (such as LZW or GZIP) to reduce the data size to improve transmission efficiency. Data verification is to generate a checksum or CRC (cyclic redundancy check) code to ensure data integrity. After the encoding is completed, the data encoding module outputs the re-encoded data for subsequent data packaging module processing.

[0079] Among them, the data packaging module packages the encoded data for transmission in the LPWAN network. Specifically, the data packaging module receives the encoded data from the data encoding module. Then the encoded data and related metadata (such as timestamp, device ID, data type, etc.) are packaged and processed. The packaging format must comply with the LPWAN protocol requirements. For example, data formats such as JSON, CBOR or binary format can be used for packaging. A header and a tail are added to the data packet to identify the start and end of the data packet, which may include information such as data length and packet sequence number, so as to facilitate data parsing by the monitoring center at the receiving end. After the data packaging is completed, the data packaging module outputs the packaged data and sends it through the LPWAN communication module.

[0080] The LPWAN communication module sends the packaged data to the monitoring center through the LPWAN network. Specifically, in one embodiment of the present invention, the LPWAN communication module includes:

[0081] A sending unit, used for sending the packaged data to a monitoring center via a LPWAN network;

[0082] A signal optimization unit, which is used to dynamically adjust the transmission power and rate based on real-time monitoring of the transmission conditions of the LPWAN network;

[0083] The data packet optimization unit is used to dynamically adjust the data packet size based on real-time monitoring of the network load and signal strength of the LPWAN network.

[0084] Specifically, the sending unit receives the packaged data from the data packaging module, and sends the packaged data to the monitoring center through the LPWAN network through the LPWAN communication interface. In the sending process, a specific modulation and demodulation technology (such as FSK, LoRa modulation, etc.) is used, and the sending unit implements the ACK mechanism, waiting for the confirmation response from the monitoring center, and retransmits if the confirmation is not received. In which, the signal optimization unit continuously monitors the transmission conditions of the LPWAN network, including signal strength, interference, etc. According to the real-time monitoring results, the transmission power and rate are dynamically adjusted. For example, when the signal strength is weak, the transmission power is increased to ensure that the data can arrive smoothly; when the signal is good, the transmission power is reduced to save energy. In which, the data packet optimization unit monitors the load and signal strength of the LPWAN network in real time, wherein the load conditions include the number of current online devices, the frequency of data transmission, etc., and then dynamically adjusts the size of the data packet according to the signal strength and network load conditions. For example: when the network load is high, the data packet size is reduced to reduce the transmission time; when the network load is low, the data packet size is increased, and multiple parameter data are merged to improve the transmission efficiency. Therefore, in the above implementation, the LPWAN gateway ensures that the data can be sent to the monitoring center quickly and accurately by encoding, packaging and optimizing the transmission process. By using confirmation mechanisms and dynamic adjustment functions, data is ensured not to be lost during transmission. By dynamically adjusting the transmission strategy according to the real-time monitoring of network conditions, the system can maintain efficient operation in various environments.

[0085] Furthermore, in one embodiment of the present invention, the monitoring center includes a data receiving module, a decoding processing module and a data processing module, wherein the data receiving module receives packaged data from each LPWAN gateway through the LPWAN network. Specifically, the data receiving module establishes a connection with the LPWAN network through the LPWAN communication interface to ensure that data can be received stably. And monitor the LPWAN network, receive the packaged data sent from each LPWAN gateway in real time, and it can use polling or interrupt mode to obtain data in time. After receiving the packaged data, perform a data integrity check to ensure that the data is not damaged, which can be verified by checksum or CRC and the like. After the check is passed, the received packaged data is passed to the decoding processing module for subsequent processing.

[0086] The decoding processing module decodes the received packaged data and restores it to various parameter data of the lighting fixture. Specifically, the decoding processing module receives the verified packaged data from the data receiving module, and uses the corresponding decoding algorithm to convert the packaged data into the original various parameter data according to the previously defined decoding rules. The decoding process includes packet header parsing and data extraction, wherein the packet header parsing is to read the packet header information to obtain metadata such as data length and device ID. Data extraction is to extract the valid data in the packet and perform data type conversion to restore the original parameter data. The decoded parameter data of the lighting fixture is then output to the data processing module for analysis and processing.

[0087] The data processing module analyzes various parameter data of the lighting fixture to determine the working status and environmental status of the lighting fixture. Specifically, the data processing module receives the restored parameter data of the lighting fixture from the decoding processing module, and performs real-time analysis on the received parameter data. The analysis content includes working status judgment and environmental status monitoring. Specifically, the working status judgment is to judge the working status (normal, fault, standby, etc.) of the lighting fixture based on its working parameter data (such as voltage, current, etc.). Environmental status monitoring is to analyze environmental parameter data (such as temperature, humidity, gas concentration, etc.) to judge the safety and suitability of the current environment.

[0088] Furthermore, in one embodiment of the present invention, the monitoring center further includes an early warning module and a remote control module. The early warning module is used to generate an alarm message when it detects that various parameter data of the lighting fixture exceeds the corresponding set threshold value. The remote control module is used to generate a control instruction according to the data analysis result or according to the manual setting of the user, and send the control instruction to the LPWAN gateway through the LPWAN network.

[0089] The LPWAN communication module also includes a receiving unit for receiving downlink control instructions from the monitoring center, decoding and transmitting them to the PLC hub;

[0090] The PLC hub also includes a control signal processing module for receiving control instructions transmitted by the LPWAN gateway and controlling the modulation and demodulation module to encode and modulate the control instructions and then load them onto the power line for transmission;

[0091] The PLC module is also used to receive the modulated signal sent by the PLC hub from the power line, demodulate and restore it to the original control instruction, and control the lighting fixture according to the control instruction.

[0092] Specifically, the monitoring center also includes an early warning module and a remote control module, wherein the early warning module monitors various parameter data of lighting fixtures and generates an alarm message when the set threshold is exceeded. Specifically, users can set the thresholds of various parameters (such as voltage, current, temperature, etc.) through the user interface of the monitoring center. The early warning module receives the parameter data from the data processing module in real time and compares it with the preset threshold. When the monitored parameter data exceeds the set threshold, an alarm message is generated, wherein the alarm message includes information such as abnormal parameters, current value, set threshold and timestamp. The early warning module reminds the user through visual or sound alarms, and sends the alarm message to the relevant monitoring system or the user's mobile device.

[0093] The remote control module generates control instructions based on the data analysis results or the manual settings of the user, and sends them to the LPWAN gateway. Specifically, the remote control module generates corresponding control instructions based on the analysis results of the data processing module or the manual control set by the user. For example, adjust the brightness of the lighting fixture, or start or stop the lighting fixture. Then the remote control module encodes the generated control instructions to adapt to the transmission protocol of the LPWAN network. The encoded control instructions are sent to the LPWAN gateway through the LPWAN communication module.

[0094] The LPWAN communication module also includes a receiving unit, which is used to receive downlink control instructions from the monitoring center, decode and transmit them to the PLC hub. Specifically, the receiving unit receives the control instructions from the monitoring center through the LPWAN network, then decodes the received control instructions, restores them to the original control instruction format, and then transmits the decoded control instructions to the PLC hub for processing.

[0095] The PLC hub also includes a control signal processing module, which receives the control instructions transmitted by the LPWAN gateway and controls the modulation and demodulation module to encode and modulate the control instructions and then load them into the power line. Specifically, the control signal processing module receives the decoded control instructions from the LPWAN communication module, then encodes the received control instructions, then modulates them through the modulation and demodulation module, converts the instructions into signals suitable for transmission on the power line, and finally loads the modulated signal into the power line for transmission, ensuring that the control instructions can reach the corresponding lighting fixtures.

[0096] Among them, the PLC module is used to receive the modulated signal sent by the PLC hub from the power line, demodulate and restore it to the original control instruction, and control the lighting fixture according to the control instruction. Specifically, the PLC module receives the modulated signal from the power line, uses the demodulation algorithm to demodulate the received modulated signal, and restores it to the original control instruction. According to the control instruction obtained by demodulation, the lighting fixture is controlled accordingly. For example, adjust the brightness or turn on / off the lamp. Therefore, in the above implementation, the early warning module can timely detect and alarm abnormal situations, realize remote control through the LPWAN network, improve the management efficiency of the system, and realize flexible control by allowing users to manually set control instructions.

[0097] In summary, the lighting fixture data transmission system in the above-mentioned embodiment of the present invention integrates a PLC module in the lighting fixture, so that the parameter data of the lighting fixture can be transmitted through the existing power line, without laying additional communication lines, thereby reducing the wiring cost; through the modulation and demodulation module and the error detection module in the PLC hub, it is ensured that the parameter data transmitted from the lighting fixture can be accurately demodulated and verified, avoiding data loss or erroneous transmission caused by channel noise, signal interference and other problems, ensuring the reliability of data transmission, and being suitable for complex electromagnetic environments in special environments such as mines where communication is inconvenient; through the LPWAN gateway, long-distance data transmission from the PLC hub to the monitoring center is realized, wherein the LPWAN network has the characteristics of long distance and low power consumption, and is suitable for monitoring data transmission in special environments such as mines and tunnels with a wide coverage, ensuring that data is reliably transmitted to the monitoring center, solving the problem of insufficient data coverage over a large area, and ensuring effective data transmission in complex environments; through the monitoring center, various parameter data from the lighting fixture are received and analyzed in real time, and the working status and environmental status of the lighting fixture are judged in time, ensuring the timeliness and effectiveness of data processing, and solving the problem of poor stability of data transmission signals of existing lighting fixtures in special environments where communication is inconvenient.

[0098] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0099] The above embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A lighting fixture data transmission system, characterized in that: It includes a plurality of lighting fixtures, a plurality of PLC hubs respectively connected to the lighting fixtures on the power lines in the area, LPWAN gateways connected to the PLC hubs, and a monitoring center communicating with the LPWAN gateways through the LPWAN network; The lighting fixture is provided with a data acquisition module and a PLC module, wherein the data acquisition module is used to collect various parameter data of the environment and the working state of the lighting fixture, and the PLC module is used to encode and modulate the parameter data collected by the data acquisition module and then load it onto the power line for transmission, wherein the various parameter data include environmental parameter data and working parameter data; The PLC hub is provided with a modulation and demodulation module, an error detection module and a data forwarding module. The modulation and demodulation module is used to receive the modulation signals sent by multiple lighting fixtures from the power line, demodulate and restore them into the original various parameter data. The error detection module is used to verify the integrity of the various parameter data after demodulation. The data forwarding module is used to forward the various parameter data after demodulation and verification to the LPWAN gateway. The LPWAN gateway is provided with a data encoding module, a data packaging module and a LPWAN communication module. The data encoding module is used to re-encode the parameter data received from the PLC hub into data adapted to the LPWAN network transmission protocol. The data packaging module is used to package the encoded data. The LPWAN communication module is used to send the packaged data to the monitoring center via the LPWAN network. The monitoring center includes a data receiving module, a decoding processing module and a data processing module. The data receiving module is used to receive packaged data from each LPWAN gateway through the LPWAN network. The decoding processing module is used to decode the received packaged data and restore it into various parameter data of the lighting fixture. The data processing module is used to analyze the various parameter data of the lighting fixture and determine the working status and environmental status of the lighting fixture.

2. The lighting fixture data transmission system according to claim 1, characterized in that: The PLC module comprises: A data encoding unit, used for encoding the collected parameter data into digital signal data; A signal modulation unit, used to convert the encoded digital signal data into a signal transmitted on the power line, and to transmit the modulated signal by superimposing it on the current in the power line; The channel monitoring unit is used to monitor the channel status of the power line and control the signal modulation unit to dynamically adjust the modulation mode and frequency selection according to the monitored channel status of the power line.

3. The lighting fixture data transmission system according to claim 2, characterized in that: The PLC module also includes: The carrier sensing unit is used to monitor whether there are signals sent by other lighting fixtures on the power line, and when it is detected that the power line is idle, it controls the signal modulation unit to transmit the modulated signal on the power line.

4. The lighting fixture data transmission system according to claim 2, characterized in that: The PLC module also includes: The multi-channel transmission unit is used to control the signal modulation unit to dynamically adjust the modulation mode and frequency selection of different parameter data according to the channel status of the power line monitored by the channel monitoring unit and the priority of various parameter data in the lighting fixture.

5. The lighting fixture data transmission system according to claim 1, characterized in that: The data forwarding module comprises: A data cache unit, used for caching various parameter data received from a plurality of lighting fixtures; A data transmission unit, used to send the demodulated and verified parameter data to the LPWAN gateway; The priority management unit is used to control the order in which the data transmission unit sends various parameter data according to the priorities assigned to the various parameter data in the lighting fixture.

6. The lighting fixture data transmission system according to claim 1, characterized in that: The LPWAN communication module includes: A sending unit, used for sending the packaged data to a monitoring center via a LPWAN network; A signal optimization unit, which is used to dynamically adjust the transmission power and rate based on real-time monitoring of the transmission conditions of the LPWAN network; The data packet optimization unit is used to dynamically adjust the data packet size based on real-time monitoring of the network load and signal strength of the LPWAN network.

7. The lighting fixture data transmission system according to claim 1, characterized in that: The monitoring center also includes an early warning module and a remote control module. The early warning module is used to generate an alarm message when it detects that various parameter data of the lighting fixture exceeds the corresponding set threshold value. The remote control module is used to generate a control instruction according to the data analysis result or according to the manual setting of the user, and send the control instruction to the LPWAN gateway through the LPWAN network; The LPWAN communication module also includes a receiving unit for receiving downlink control instructions from the monitoring center, decoding and transmitting them to the PLC hub; The PLC hub also includes a control signal processing module for receiving control instructions transmitted by the LPWAN gateway, and controlling the modulation and demodulation module to encode and modulate the control instructions and then load them onto the power line for transmission; The PLC module is also used to receive the modulated signal sent by the PLC hub from the power line, demodulate and restore it into the original control instruction, and control the lighting fixture according to the control instruction.

8. The lighting fixture data transmission system according to claim 2, characterized in that: The channel monitoring unit comprises: A signal analysis subunit is used to analyze the signal quality information in the power line in real time, and control the signal modulation unit to dynamically adjust the frequency selection and modulation mode according to the signal quality information, wherein the signal quality information includes the interference frequency band, signal strength and bit error rate; The channel estimation subunit is used to estimate the channel characteristics of the power line and control the signal modulation unit to dynamically adjust the modulation mode according to the channel estimation result. The channel characteristics include path loss, multipath effect and noise distribution.

9. The lighting fixture data transmission system according to claim 1, characterized in that: The data acquisition module comprises: Temperature and humidity sensors are used to collect temperature and humidity data of the environment where the lighting fixtures are located; Gas concentration sensor, used to collect gas concentration data in the air of the environment where the lighting fixture is located; Voltage and current acquisition module, used to collect voltage and current data when the lighting fixture is working; The lamp status collection module is used to collect the working status data of the lighting fixtures, including the switch status, light intensity, operating time and fault information.

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