Dual-channel RFID reader control method and system based on dynamic coordination mechanism

Abstract

The application relates to the technical field of data recognition, in particular to a double-channel RFID reader control method and system based on a dynamic coordination mechanism. The method comprises the following steps: acquiring environment parameters of a current application scene, including interference signal intensity, working temperature and humidity; acquiring label distribution information, including label density, position coordinates and motion speed; and acquiring host computer instructions, including a priority identification label ID prefix and a priority reading label data type, to provide multi-source data support for double-channel dynamic coordination. The double-channel RFID reader control method and system based on the dynamic coordination mechanism can acquire multi-source data, i.e. environment parameters, label distribution information and host computer instructions, through a scene sensing module, can provide comprehensive data support for coordination strategy generation, can improve label recognition efficiency, interference suppression capacity and task response speed of the double-channel RFID reader, and is suitable for complex dynamic scenes such as logistics sorting and warehouse management.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data recognition, in particular to a dual-channel RFID reader control method and system based on a dynamic coordination mechanism. BACKGROUND

[0002] As the core technology of the perception layer of the Internet of Things, RFID technology is widely used in logistics, warehousing, retail and other fields. In order to improve the tag identification efficiency and expand the coverage, dual-channel RFID readers gradually become the industry mainstream because they have the ability to work in parallel with dual-antenna channels.

[0003] The control method of the existing dual-channel RFID reader mostly adopts a static coordination strategy, such as a fixed time division multiplexing or frequency division multiplexing mode, which can only cope with the coordination needs in simple scenarios. In actual applications, the scene environment, tag distribution and host computer instructions are all in dynamic changes, and the static strategy cannot real-time perceive these changes and adjust the coordination mode: for example, when the interference signal in the environment is enhanced, the channel with fixed frequency is easily disturbed, resulting in a decrease in the tag identification rate; when the tag density increases sharply, the time division multiplexing strategy with fixed time slices cannot timely increase the channel switching frequency, resulting in an increase in the missed reading rate; when the host computer requires to identify specific tags in priority, the static strategy cannot quickly adjust the channel priority, resulting in a delay in the response to the priority task. These problems jointly restrict the performance of the dual-channel RFID reader and are difficult to meet the high requirements in complex dynamic scenarios. SUMMARY

[0004] The present disclosure proposes a dual-channel RFID reader control method and system based on a dynamic coordination mechanism, aiming to overcome at least one defect in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solutions disclosed by the present application are as follows:

[0006] According to one aspect of the present disclosure, a dual-channel RFID reader control method based on a dynamic coordination mechanism is provided, and the steps include:

[0007] Obtaining the current application scenario, including the environmental parameters of the interference signal strength, working temperature and humidity; including the tag distribution information of the tag density, position coordinates and motion speed; including the host computer instructions of the priority identification tag ID prefix and the priority reading tag data type, providing multi-source data support for the dynamic coordination of the dual channels;

[0008] Generating a fusion strategy according to the multi-source data, the fusion strategy including an automatic frequency hopping strategy based on the interference signal strength, a time division multiplexing strategy based on the tag density and a priority identification strategy based on the host computer instructions, for determining the working mode and coordination mode of the dual channels;

[0009] Switching the working frequency of the dual channel according to the automatic frequency hopping strategy, allocating the working time slice of the dual channel according to the time division multiplexing strategy, and controlling the dual channel to preferentially perform the read / write operation of the target tag according to the priority identification strategy, so as to realize the dynamic cooperation of the dual channel.

[0010] Collecting the dual-channel RFID operation results and environmental parameter changes, and respectively adjusting the frequency switching threshold of the automatic frequency hopping strategy, the time slice length of the time division multiplexing strategy, and the tag priority weight of the priority identification strategy, for dynamically optimizing the cooperation strategy.

[0011] Further, one step of the automatic frequency hopping strategy includes: when the interference signal strength exceeds a preset threshold, controlling the dual channel to switch to a preset non-interference frequency channel, and the preset non-interference frequency channel is determined according to multi-region frequency configuration parameters, and the multi-region frequency configuration parameters include the frequency range and channel interval of the current working region.

[0012] Further, one step of the time division multiplexing strategy includes: dynamically allocating the working time slice length of the dual channel according to the tag density, when the tag density is higher than a first threshold, shortening the time slice length to increase the channel switching frequency, and increasing the tag identification coverage; and when the tag density is lower than a second threshold, lengthening the time slice length to reduce the channel switching overhead to improve the single-channel operation efficiency.

[0013] Further, one step of the priority identification strategy includes: according to the priority identification tag type in the host computer instruction, controlling the dual channel to preferentially read or write the data of the tag of the type when performing the RFID operation, and the priority identification tag type includes the protocol type of the electronic tag, the tag purpose, and the user to which the tag belongs.

[0014] Further, the execution mode of the automatic frequency hopping strategy includes using frequency hopping spread spectrum technology to switch the working frequency of the dual channel according to a preset frequency hopping sequence, and the frequency hopping sequence is dynamically generated according to the frequency regulation of the current working region and the interference signal strength, to ensure that the dual channel works in a non-interference frequency channel.

[0015] Further, the execution mode of the time division multiplexing strategy includes realizing the time synchronization of the dual channel through an internal real-time clock, to ensure that the dual channel works alternately within the allocated time slice, to avoid signal interference between the channels, and the accuracy of the time synchronization is less than 1 millisecond.

[0016] Further, the execution mode of the priority identification strategy includes inserting the operation task of the target tag into the RFID operation queue of the dual channel, to improve the priority of the operation task of the target tag, and to ensure that the operation task of the target tag is executed before other tag operation tasks, and the target tag meets the priority identification tag type in the host computer instruction.

[0017] Further, the RFID operation result collection includes collecting the dual-channel tag recognition rate, error code rate, missed reading rate and reading time of each tag in real time, the environmental parameter change includes the change amount of interference signal strength and the change amount of working temperature, and the collection frequency is at least once per second.

[0018] Further, the adjustment of the automatic frequency hopping strategy includes:

[0019] The collected dual-channel RFID operation results and environmental parameter changes are analyzed by using a machine learning algorithm to predict the optimal frequency switching threshold, time slice length and tag priority weight, so as to realize self-optimization of the cooperative strategy, and the training data of the machine learning algorithm includes historical scene perception data, cooperative strategy and corresponding dual-channel RFID operation results.

[0020] The adjusted cooperative strategy is sent to the upper computer through a pre-defined communication protocol, and the adjusted cooperative strategy is executed after receiving the confirmation instruction of the upper computer;

[0021] If the confirmation instruction of the upper computer is not received within a preset time, the original cooperative strategy remains unchanged, the pre-defined communication protocol includes a command frame, a response frame and a notification frame, the command frame is used for the upper computer to send instructions, the response frame is used for the reader to return results, and the notification frame is used for the reader to send state information.

[0022] According to another aspect of the present disclosure, a dual-channel RFID reader control system based on a dynamic cooperative mechanism is provided for realizing the dual-channel RFID reader control method based on the dynamic cooperative mechanism as described above, comprising:

[0023] A scene perception module is configured to acquire environmental parameters, tag distribution information and upper computer instructions of a current application scene, and to provide multi-source data support for dual-channel dynamic cooperation;

[0024] A strategy generation module is connected to the scene perception module and is configured to generate a fusion strategy based on multi-source data of the scene perception module, the fusion strategy including an automatic frequency hopping strategy based on interference signal strength, a time division multiplexing strategy based on tag density, and a priority identification strategy based on upper computer instructions, to determine the working mode and cooperative mode of the dual channels;

[0025] A channel control module is connected to the strategy generation module and is configured to switch the working frequency of the dual channels according to the automatic frequency hopping strategy, to allocate the working time slice of the dual channels according to the time division multiplexing strategy, and to control the dual channels to preferentially perform reading and writing operations on target tags according to the priority identification strategy, so as to realize dynamic cooperation of the dual channels.

[0026] A feedback adjustment module is connected to the channel control module and the strategy generation module, and is configured to collect double-channel RFID operation results and environmental parameter changes in the channel control module, and adjust a frequency switching threshold of the automatic frequency hopping strategy, a time slice length of the time division multiplexing strategy, and a tag priority weight of the priority identification strategy, so as to dynamically optimize the cooperative strategy.

[0027] The present application has the following advantages:

[0028] The double-channel RFID reader control method and system based on the dynamic cooperative mechanism provided by the present application can obtain multi-source data, i.e., environmental parameters, tag distribution information and host computer instructions, through a scene perception module, so as to provide comprehensive data support for cooperative strategy generation.

[0029] Specifically, the strategy generation module fuses the automatic frequency hopping, time division multiplexing and priority identification strategies, dynamically determines the channel operation mode and the cooperative mode for different scenes, and realizes accurate adaptation to environmental interference, tag distribution and host computer instructions.

[0030] Further, the channel control module dynamically switches the frequency, allocates the time slice and adjusts the task priority according to the fused strategy, so as to ensure efficient cooperation of the two channels in complex scenes; and the feedback adjustment module collects operation results and environmental changes, and optimizes the strategy parameters in real time, such as the frequency switching threshold, the time slice length and the priority weight, so as to realize self-learning and self-optimization of the cooperative strategy.

[0031] Compared with the prior art, the present application has the advantages of constructing a dynamic cooperation of "perception-generation-control-feedback", solving the problem that the existing static cooperative strategy cannot adapt to complex dynamic scenes through multi-source data fusion and dynamic strategy adjustment.

[0032] Specifically, the automatic frequency hopping strategy can avoid environmental interference in real time, and significantly improve the tag identification rate; the time division multiplexing strategy dynamically adjusts the time slice according to the tag density, reduces the channel switching overhead while ensuring the identification coverage; and the priority identification strategy quickly responds to the host computer instructions, and meets the priority task demand in specific scenes. Through the self-optimization mechanism of the feedback adjustment module, the cooperative strategy can continuously evolve with the change of the scene, further improving the adaptability and stability of the double-channel reader, improving the tag identification efficiency, interference suppression ability and task response speed of the double-channel RFID reader, and being applicable to complex dynamic scenes such as logistics sorting and warehouse management.

[0033] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, and to implement the content of the description, the following will describe the preferred embodiments of the present application in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 Flow chart of the control method of the dual-channel RFID reader in an embodiment of the present application;

[0035] Figure 2 Effect diagram of the dynamic frequency hopping strategy in an embodiment of the present application;

[0036] Figure 3 Tag identification rate thermal diagram and tag density distribution statistical diagram in an embodiment of the present application;

[0037] Figure 4 Dual-channel time slice optimization analysis diagram in an embodiment of the present application;

[0038] Figure 5 Channel coordination optimization performance comparison diagram in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0040] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. In fact, the words such as "exemplary" or "for example" are intended to present the related concept in a specific manner.

[0041] The present application provides the following preferred embodiments:

[0042] Embodiment one: In view of the problem that the existing static coordination strategy cannot adapt to complex dynamic scenarios, the embodiment refines the specific execution process of the dual-channel RFID reader control method based on the dynamic coordination mechanism, focuses on the logical association of multi-source data acquisition, fusion strategy generation, dynamic coordination execution and feedback optimization, and realizes the dynamic coordination of "perception-generation-control-feedback". As shown in Figure 1 The steps of the control method are as follows:

[0043] S100: Obtain the environmental parameters of the current application scenario, including the interference signal strength, working temperature and humidity; the tag distribution information, including the tag density, position coordinates and motion speed; and the host computer instruction, including the priority identification tag ID prefix and the priority reading tag data type, to provide multi-source data support for the dual-channel dynamic coordination.

[0044] S200: generating a fusion strategy according to multi-source data, the fusion strategy including an automatic frequency hopping strategy based on interference signal strength, a time division multiplexing strategy based on tag density, and a priority identification strategy based on host computer instructions, for determining the working mode and coordination mode of the dual channels.

[0045] S300: switching the working frequency of the dual channels according to the automatic frequency hopping strategy, allocating the working time slice of the dual channels according to the time division multiplexing strategy, and controlling the dual channels to preferentially perform the read / write operation of the target tag according to the priority identification strategy, to realize dynamic coordination of the dual channels.

[0046] S400: collecting the RFID operation results and environmental parameter changes of the dual channels, and respectively adjusting the frequency switching threshold of the automatic frequency hopping strategy, the time slice length of the time division multiplexing strategy, and the tag priority weight of the priority identification strategy, for dynamically optimizing the coordination strategy.

[0047] In the embodiment, the multi-source data of the current application scenario is the basis for dynamic coordination, which specifically includes real-time collection of environmental parameters through the sensor module built-in the reader, such as interference signal strength obtained by detecting the noise power under the current working frequency through the radio frequency front-end module, working temperature and humidity collected through the temperature and humidity sensor; tag distribution information obtained through the backscattering signal strength of the RFID tag and the angle estimation of the reader antenna array, such as tag density determined by counting the number of tags per unit area, position coordinates calculated by the angle of arrival of the multi-antenna receiving signal, and motion speed derived by continuously collecting the time difference of tag position; host computer instructions received through the communication interface between the reader and the host computer, such as the ID prefix of the priority identification tag and the tag data type of the priority reading. These multi-source data provide comprehensive support for the dynamic coordination of the dual channels from three dimensions of environment, tag and task demand, ensuring the pertinence and accuracy of the subsequent strategy generation. For example, the interference signal strength data is directly related to the trigger condition of the automatic frequency hopping strategy, the tag density data determines the time slice length of the time division multiplexing strategy, and the host computer instructions explicitly indicate the task priority of the priority identification strategy.

[0048] Furthermore, when generating a fusion strategy based on multi-source data, environmental parameters, tag distribution information, and host computer instructions need to be correlated and analyzed to form a comprehensive collaborative strategy encompassing automatic frequency hopping, time-division multiplexing, and priority identification. Specifically, the interference signal strength in the environmental parameters triggers the generation of the automatic frequency hopping strategy to determine the operating frequency of the dual channels; the tag density in the tag distribution triggers the generation of the time-division multiplexing strategy to allocate the working time slices of the dual channels; and the host computer instructions trigger the generation of the priority identification strategy to control the task priority of the dual channels. These three are not executed independently but are integrated into a whole. For example, when the interference signal is strong and the tag density is high, the automatic frequency hopping strategy will switch to the interference-free frequency, while the time-division multiplexing strategy will shorten the time slice length to increase the channel switching frequency, and the priority identification strategy will allow the dual channels to prioritize the tags specified by the host computer during the switching process, jointly determining the working mode and collaborative method of the dual channels. This fusion method ensures that the strategy can simultaneously adapt to the dynamic changes in environmental interference, tag distribution, and task requirements, avoiding the limitations of a single strategy.

[0049] Furthermore, when executing dual-channel dynamic coordination according to the fusion strategy, the automatic frequency hopping strategy is responsible for switching the operating frequency. When the interference signal strength exceeds a preset threshold, the dual channels are controlled to switch from the current frequency to a preset interference-free frequency channel. Figure 2 As shown, the frequency hopping paths of channels 1 and 2 avoid high-frequency interference regions such as 900MHz and 920MHz, ensuring operation in low-interference channels. The time-division multiplexing strategy is responsible for allocating working time slices. When the tag density is higher than the first threshold, the time slice length is shortened to increase the channel switching frequency. Figure 4 As shown, the time slice length dynamically decreases as the label density increases, for example, from a label density of 1.0 labels / m². 2 Increased to 2.5 tags / m 2 In this way, the time slice is shortened from 200ms to 80ms; the priority identification strategy is responsible for controlling priority operation. When the host computer instruction requires priority reading of tags with a specific ID prefix, the dual channels are controlled to scan tags with that prefix and read their data first when performing RFID operations, ensuring that the processing priority of the target tag is higher than that of ordinary tags. The three work together to achieve dynamic adaptation of the dual channels in terms of frequency, time and task.

[0050] Further, the feedback adjustment collects the dual-channel RFID operation results and environmental parameter changes, such as tag recognition rate, error rate, and missed reading rate, changes in interference signal strength, and changes in working temperature, and dynamically optimizes the parameters in the fusion strategy. For example, when it is collected that the interference signal strength is continuously higher than the original frequency switching threshold, the frequency switching threshold of the automatic frequency hopping strategy is adjusted, such as from -60 dBm to -70 dBm, to trigger the frequency hopping operation earlier and avoid the influence of interference on the recognition rate; when it is collected that the recognition rate when the tag density is higher than the first threshold does not reach the expectation, the time slice length of the time division multiplexing strategy is adjusted, such as from 200 ms to 80 ms, to further increase the channel switching frequency and increase the tag recognition coverage; when it is collected that the processing time of the priority recognition tag in the host computer instruction is too long, the tag priority weight of the priority recognition strategy is adjusted, such as from 0.6 to 0.8, to increase the processing priority of the tag and speed up the task response speed. These adjustments are achieved through the feedback mechanism to ensure that the collaborative strategy continuously evolves with the changes in the scene, and the performance curve is combined with the basic performance curve as shown in FIG. 8 to form a complete dynamic adjustment mechanism. Figure 5 As shown in FIG. 8, the optimized performance curve is obviously better than the basic performance, which reflects the improvement of the feedback adjustment on the collaborative effect.

[0051] The benefit of the embodiment is that the embodiment realizes the dynamic collaborative control of the dual-channel RFID reader, that is, from multi-source data acquisition to fusion strategy generation, to strategy execution and feedback optimization, forming a complete dynamic adjustment mechanism. This mechanism ensures that the dual-channel can adapt to the dynamic changes of environmental interference, tag distribution, and host computer instructions in real time, solves the problem that the existing static collaborative strategy cannot adapt to complex scenes, and improves the adaptability and stability of the dual-channel reader.

[0052] Embodiment Two: In order to solve the problem that the existing automatic frequency hopping strategy does not fully consider the regional frequency difference, resulting in insufficient legality and interference avoidance effect, the embodiment further refines the channel selection logic based on the multi-region frequency configuration parameters in the automatic frequency hopping strategy. The execution of the automatic frequency hopping strategy is based on the multi-region frequency configuration parameters, which include the legal frequency range and channel spacing information of the current working region, and the acquisition method is to synchronize in real time through the communication interface of the reader and the host computer or to prestore through the region configuration module built-in the reader. These parameters serve as constraints for frequency hopping, ensuring that the frequency of dual-channel switching is always within the legal range of the current region.

[0053] Further, the reader monitors the interference signal strength at the current working frequency in real time through the radio frequency front-end module, and automatically triggers the frequency hopping operation when the interference signal strength exceeds the preset threshold. At this time, the reader selects the target channel from the preset non-interference frequency channels, which are pre-selected according to the multi-region frequency configuration parameters, and meet the frequency requirements of the current region and avoid known high-interference areas. For example, Figure 2As shown, the frequency hopping paths of channel 1 and channel 2 avoid high-frequency interference regions such as 900MHz and 920MHz, and their working frequencies are strictly controlled within the legal frequency range of the current region. The dual-channel frequency hopping paths dynamically adjust by continuously monitoring the interference signal strength, ensuring that they avoid interference while complying with regional frequency regulations.

[0054] The benefit of this embodiment is that by introducing multi-region frequency configuration parameters, the automatic frequency hopping strategy can maintain frequency legality in different regions while achieving precise interference-free channel switching in combination with interference monitoring, thereby improving the adaptability of the dual-channel reader in cross-region scenarios.

[0055] Embodiment Three: To solve the problem of insufficient adaptability of tag density variation caused by the fixed time slice length of the existing time division multiplexing strategy, this embodiment further refines the logic of dynamically adjusting the working time slice length based on tag density in the time division multiplexing strategy. The core of the time division multiplexing strategy is to adjust the working time slice allocation of the dual channels according to the change of tag density. Tag density is obtained by dividing the number of tags identified in a unit of time by the coverage area of the reader, and its value reflects the degree of tag concentration in the current scenario.

[0056] Further, the time division multiplexing strategy sets a first threshold and a second threshold as the trigger conditions for time slice length adjustment. When the tag density is higher than the first threshold, it indicates that the tag distribution is relatively dense in the current scenario, and the switching frequency of the dual channels needs to be increased to cover more tag areas. At this time, the time slice length is shortened, for example, from 200ms to 80ms, so that the dual channels can switch working areas more frequently, increasing the coverage rate of tag identification; when the tag density is lower than the second threshold, it indicates that the tag distribution is relatively sparse in the current scenario, and the long time slice will increase the switching overhead between channels. At this time, the time slice length is extended, for example, from 200ms to 400ms, reducing the switching frequency between the dual channels, allowing the single channel to have more time to complete the reading or writing operation of each tag, and improving the operation efficiency of the single channel. Figure 4 The dual-channel time slice optimization analysis diagram shown intuitively demonstrates this dynamic adjustment process. The time slice length gradually shortens as the tag density increases, and gradually extends as the tag density decreases, achieving dynamic matching of the time slice length and the tag density.

[0057] The benefit of this embodiment is that the time division multiplexing strategy can adjust the time slice length according to the dynamic change of tag density, ensuring the identification coverage rate in high tag density scenarios and optimizing the operation efficiency in low tag density scenarios, thereby achieving performance balance in different scenarios.

[0058] Embodiment Four: In order to solve the problem that the existing priority identification strategy cannot accurately respond to the dynamic task priority requirements of the host computer, this embodiment further refines the logic of controlling the double-channel priority processing target tags based on the host computer instruction in the priority identification strategy. The execution of the priority identification strategy takes the host computer instruction as input, which is transmitted to the reader through the Ethernet or RS232 interface, and contains the label type information that needs to be identified. These type information covers the protocol type, purpose and user of the electronic tag.

[0059] Further, after the reader analyzes the host computer instruction, it extracts the priority tag type information and converts it into specific control logic. For example, when the host computer instruction requires priority reading of tags using EPC Gen2 protocol, for logistics tracking and belonging to a certain enterprise, the reader first sends a query command for EPC Gen2 protocol when executing RFID operations, limiting the response range of the tag. In the ID information returned by the tag, the tag containing the enterprise prefix is selected as the priority processing object. During the work of the double-channel, the area where these target tags are located is scanned first, and their data is read first, ensuring that the target tags are processed before ordinary tags. This processing method ensures the accurate execution of the host computer instruction, enabling the double-channel reader to dynamically adjust the processing priority according to the task requirements.

[0060] The benefit of this embodiment is that the priority identification strategy can accurately respond to the task priority requirements of the host computer, and ensure the priority processing of target tags by controlling the operation sequence of the double-channel, improving the support capability of the double-channel reader for dynamic tasks.

[0061] Embodiment Five: In order to solve the problem that the existing automatic frequency hopping strategy cannot dynamically adapt to regional frequency and real-time interference changes due to fixed frequency hopping sequence, this embodiment further optimizes the dynamic frequency hopping sequence generation logic based on frequency hopping spread spectrum technology in the automatic frequency hopping strategy. The automatic frequency hopping strategy uses frequency hopping spread spectrum technology, and the generation of the frequency hopping sequence is based on the legal frequency range of the current working area, for example, the legal frequency range in Europe is 865-868MHz, and in North America is 902-928MHz. These parameters are pre-stored through the regional configuration module built-in the reader or synchronized in real-time with the host computer communication interface. At the same time, the frequency hopping sequence generation module combines the interference signal strength data monitored in real-time by the radio frequency front-end module, such as Figure 2 As shown in the figure, the 900MHz and 920MHz regions show high frequency interference characteristics, the generation process first selects all available channels within the legal frequency range of the current region, then excludes high interference channels according to real-time interference strength, and finally generates a sequence of frequency channels without interference. The double-channel switches the working frequency according to the frequency hopping sequence, ensuring that each frequency hopping falls on a legal and interference-free channel.

[0062] Further, when the interference intensity of a certain channel is monitored to exceed the preset threshold, the frequency hopping sequence generation module will automatically exclude the channel from the sequence and supplement other legal interference-free channels to ensure dynamic updating of the frequency hopping sequence, for example Figure 2 Neither of the dual-channel frequency hopping paths enters the high-frequency interference region of 900 MHz, 920 MHz, etc., and always switches within the low-interference legal channel. It should be understood that the application of frequency hopping spread spectrum technology enables the working frequency of the dual channel to switch rapidly according to the frequency hopping sequence, reducing the probability of being interfered at a single frequency, and the dynamically generated frequency hopping sequence ensures that such switching always meets the regional frequency requirements and avoids real-time interference.

[0063] The benefit of the present embodiment is that, through the frequency hopping spread spectrum technology and the dynamically generated frequency hopping sequence, the automatic frequency hopping strategy can adapt to the regional frequency requirements and interference environment changes in real time, ensuring that the dual channel always works in a legal and interference-free frequency channel, improving the adaptability and reliability of the frequency hopping strategy.

[0064] Embodiment Six: In order to solve the problem of insufficient time synchronization accuracy in the existing time division multiplexing strategy leading to inter-channel signal interference, the present embodiment further refines the time synchronization mechanism based on the internal real-time clock in the time division multiplexing strategy. The time division multiplexing strategy realizes time synchronization of the dual channel through an internal real-time clock, and the clock signal of the real-time clock is simultaneously input to the control modules of the dual channel, ensuring that the time references of the dual channel are completely consistent. The accuracy of time synchronization is less than 1 millisecond. This high-precision synchronization ensures that the dual channel strictly alternates in the allocated time slice, for example, as shown in Figure 4 The time slice is shortened in a high-tag-density scenario, the real-time clock sends a start signal to channel 1, channel 1 starts working, 80 ms later the real-time clock sends a stop signal to channel 1 and a start signal to channel 2, channel 2 starts working, and so on. It should be understood that this time synchronization mechanism avoids inter-channel signal interference caused by time slice overlap, ensuring that only one channel is in working state within each time slice. Even in the scenario of dynamic adjustment of time slices, such as the length of the time slice being shortened from 200 ms to 80 ms or lengthened to 400 ms due to changes in tag density, the internal real-time clock can still maintain time synchronization of the dual channel, ensuring the accuracy of time slice switching.

[0065] The benefit of the present embodiment is that, through high-precision time synchronization of the internal real-time clock, the time division multiplexing strategy can ensure that the dual channel strictly alternates in the time slice, avoiding inter-channel signal interference and improving the stability and reliability of the time division multiplexing strategy.

[0066] Embodiment seven: In order to solve the problem that the target tag operation task cannot be accurately inserted into the operation queue in the existing priority identification strategy, resulting in the priority execution not being timely, this embodiment further refines the target task priority management logic based on the operation queue in the priority identification strategy. The execution of the priority identification strategy takes the target tag type in the host computer instruction as input. When the host computer instruction is received, the control module parses the type information of the target tag, such as the protocol type, purpose, and user it belongs to. Then the corresponding operation task is inserted into the front end of the double-channel RFID operation queue. The operation queue adopts a priority queue management mechanism, and the operation task of the target tag is marked as high priority to ensure that it is executed before the operation task of the ordinary tag. For example, when the host computer instruction requires priority processing of a logistics tracking tag using the EPC Gen2 protocol, the control module inserts the operation task into the front end of the queue. When the double channel executes the RFID operation, it first takes out the target task from the front end of the queue and performs the tag reading operation. After the target task is completed, the subsequent ordinary task is processed, such as Figure 5 In the channel cooperative optimization performance comparison diagram shown in the figure, the optimized priority processing strategy makes the target tag identification process more smooth. It should be understood that the insertion operation of the operation queue does not interrupt the execution of the existing task, but only adjusts the execution order of the task to ensure that the operation task of the target tag can respond to the priority requirement of the host computer in a timely manner. This queue management mechanism ensures the accuracy of the target task insertion and avoids priority execution errors caused by queue chaos.

[0067] The benefit of this embodiment is that through the target task insertion and priority management in the operation queue, the priority identification strategy can accurately respond to the task priority requirement of the host computer, ensure that the operation task of the target tag is executed before other tasks, and improve the accuracy and timeliness of the priority identification strategy.

[0068] Embodiment eight: In order to solve the problem that the existing collection mechanism cannot timely reflect the operation state and environmental changes of the double channel due to incomplete content coverage or insufficient frequency, this embodiment further refines the collection logic of RFID operation results and environmental parameter changes.

[0069] Specifically, the RFID operation result collection covers the respective tag recognition rates, error code rates, missed reading rates and reading times of each tag of the two channels, wherein the tag recognition rate is the proportion of the number of successfully read tags in a unit of time to the total number of tags, the error code rate is the proportion of the number of error bits in the received signal to the total number of bits, the missed reading rate is the proportion of the number of unread tags to the total number of tags, and the reading time of each tag is the time from the identification of a single tag to the completion of processing. The environmental parameter change collection includes the change amount of interference signal strength and the change amount of working temperature, the change amount of interference signal strength is the difference between the current moment and the previous second interference signal strength, and the change amount of working temperature is the difference between the current temperature and the preset reference temperature. The collection frequency is set to at least once per second to ensure that the data can reflect the dynamic changes of the operation state of the two channels and the environmental parameters in real time.

[0070] Further, the collected data is transmitted to the data processing module through the internal bus, wherein the tag recognition rate, the error code rate, the missed reading rate and the reading time of each tag are used to evaluate the working performance of the two channels, the change amount of interference signal strength is used to judge the burst situation of environmental interference, and the change amount of working temperature is used to monitor the working state of the reader-writer itself to avoid performance degradation caused by excessive temperature. It should be understood that the collection content covers multiple dimensions of operation results and key changes of environmental parameters, ensuring the comprehensiveness of the data; the frequency of at least once per second ensures the real-time nature of the data, so that the subsequent adjustment of the cooperative strategy can respond to the changes of the channel state and the environment in a timely manner.

[0071] The benefit of the embodiment is that the comprehensive and real-time RFID operation result and environmental parameter change collection provides accurate input data for the adjustment of the cooperative strategy, ensuring the timeliness and accuracy of the strategy adjustment.

[0072] Embodiment Nine: In order to solve the problem that the existing automatic frequency hopping strategy adjustment relies on fixed rules and cannot adapt to complex scene changes, the embodiment further optimizes the adjustment mode of the automatic frequency hopping strategy, introduces a machine learning driven self-optimization mechanism and a host computer confirmation mechanism.

[0073] Specifically, the adjustment process first uses a decision tree classification algorithm or a BP neural network algorithm to analyze the collected RFID operation results and environmental parameter changes, wherein the RFID operation results include the tag recognition rate, the error code rate, the missed reading rate and the reading time of each tag, and the environmental parameter changes include the change amount of interference signal strength and the change amount of working temperature. The purpose of the analysis is to predict the optimal frequency switching threshold, time slice length and tag priority weight, the frequency switching threshold is the critical value when the interference signal strength reaches the value, the time slice length is the respective working time allocation of the two channels, and the tag priority weight is the processing priority coefficient of different tags.

[0074] Further, the training data of the machine learning algorithm comes from historical scene perception data, corresponding cooperative strategy and operation result, the historical scene perception data includes past interference signal strength, working temperature and other environmental parameters, the cooperative strategy includes the frequency switching threshold, time slice length and label priority weight at that time, and the operation result includes the label recognition rate, error rate and other performance indicators at that time.

[0075] Further, the adjusted cooperative strategy is sent to the host computer through a predefined communication protocol, the predefined communication protocol includes a command frame, a response frame and a notification frame, the command frame is used for the host computer to send instructions, the response frame is used for the reader to return results, and the notification frame is used for the reader to send state information, the notification frame is used for transmitting the adjusted cooperative strategy, the host computer returns an acknowledgement instruction after receiving, and the reader executes the adjusted strategy after receiving the acknowledgement instruction; if the acknowledgement instruction of the host computer is not received within a preset time, the original cooperative strategy remains unchanged, the preset time is set according to the application scenario to ensure the safety of the strategy adjustment.

[0076] It should be understood that the application of the machine learning algorithm enables the cooperative strategy to be predicted based on historical data, improving the adaptability of the strategy to complex scenes; the host computer confirmation mechanism ensures the reliability of the strategy adjustment, avoiding the impact of misoperation on the system. The benefit of the embodiment is that the self-optimization of the cooperative strategy is realized through machine learning, improving the adaptability of the strategy; through the host computer confirmation mechanism, the safety of the strategy adjustment is ensured.

[0077] In order to solve the problem that the fixed time slice allocation in the existing cooperative strategy cannot adapt to the dynamic change of label density, the embodiment further refines the time slice dynamic adjustment strategy, realizes the dynamic allocation of the working time of the double channel by monitoring the label density in real time and triggering the time slice length optimization. In the embodiment, the label density is collected in real time by the RFID reader, defined as the number of labels per unit area (label number / m 2 ), and three density thresholds are set, i.e. low density threshold, medium density threshold and high density threshold, to divide different label distribution scenarios. When the label density is lower than the low density threshold, it means that the current scene label distribution is sparse, at this time the time slice length of the double channel is shortened to reduce unnecessary time allocation; when the label density is between the medium density threshold and the high density threshold, the time slice length is kept unchanged to maintain a stable working rhythm; when the label density exceeds the high density threshold, the time slice length is extended to increase the working time of the double channel to meet the processing demand under high label density.

[0078] As Figure 4The label density real-time change curve shown in the figure is marked with three density thresholds, showing the fluctuation of label density over time; the middle subgraph is a time slice dynamic adjustment curve, which clearly presents the adjustment process of the time slice length with the change of label density. When the label density exceeds the high-density threshold, the time slice length is significantly lengthened, and when the label density falls below the medium-density threshold, the time slice length is shortened accordingly. After the time slice is adjusted, the recognition rate remains at a high level and does not decrease significantly due to the large change in label density. It should be understood that label density is a key environmental parameter that affects the processing capacity of the dual-channel. When the label density increases, if the time slice length is fixed, it will lead to insufficient processing time for a single channel, thereby reducing the recognition rate. By monitoring the label density in real time and dynamically adjusting the time slice length, the working time of the dual-channel can be matched with the label density, ensuring that each channel has enough time to process the label and maintaining the stability of the recognition rate.

[0079] The benefit of the embodiment is that, through the time slice dynamic adjustment strategy, the adaptation of the dual-channel working time to the label density is achieved, the adaptability of the cooperative strategy to the label distribution change is improved, and the stability of the label recognition rate is ensured.

[0080] Embodiment Ten: In order to solve the problem that the existing dual-channel RFID reader control system cannot adapt to the dynamic changes of the scene due to the fixed cooperative strategy, thereby leading to performance degradation, the embodiment provides a dual-channel RFID reader control system based on a dynamic cooperative mechanism, which realizes dynamic adjustment and optimization of the strategy through multi-module cooperation. Specifically:

[0081] The control system includes a scene perception module, a strategy generation module, a channel control module, and a feedback adjustment module. Each module realizes data interaction and instruction transmission through an internal bus, forming a dynamic cooperative mechanism of "perception-decision-execution-feedback". The scene perception module serves as the data entry and is used to obtain the environmental parameters, label distribution information, and host computer instructions of the current application scene, providing multi-source data support for subsequent strategy generation. The environmental parameters include the interference signal strength collected by the built-in spectrum analyzer of the reader and the working temperature collected by the temperature sensor. The label distribution information includes the label ID read by the RFID and the label density and label position distribution estimated by the signal strength. The host computer instructions include the instructions such as the priority identification label type and task priority received through the pre-defined communication protocol, such as the command frame. These data are not collected in isolation, but are synchronized and integrated into structured scene data through time stamping, ensuring the timeliness and consistency of the data. For example, the interference signal strength, label density, and host computer instructions at the same time are associated to provide a complete scene snapshot for strategy generation.

[0082] Further, the strategy generation module is connected with the scene awareness module, and is used for generating a fusion strategy according to the multi-source data of the scene awareness module, the fusion strategy including an automatic frequency hopping strategy based on an interference signal strength, a time division multiplexing strategy based on a tag density, and a priority identification strategy based on a host computer instruction, the three strategies not being simply superimposed but being dynamically integrated according to a scene priority. Specifically, the strategy generation module first analyzes the host computer instruction to determine a priority identification tag type and a task priority, for example, when the host computer requires priority reading of a certain batch of tags, the priority identification strategy gives the tags of this type a higher priority weight; then, in combination with the interference signal strength in the environmental parameter, a decision tree classification algorithm is used to analyze the correlation between historical interference data and frequency hopping effect to predict an optimal frequency switching threshold in the current scene, that is, a critical value of the interference signal strength triggering frequency switching, and an automatic frequency hopping strategy is generated; finally, in combination with the tag density in the tag distribution information, a BP neural network algorithm can be used to analyze the adaptive relationship between historical tag density and time slice length to predict the optimal time slice length under the current tag density, that is, the time distribution of the work of the two channels, and a time division multiplexing strategy is generated. The generation process of the fusion strategy needs to take into account the weights of the multi-source data, for example, the priority of the host computer instruction is higher than that of the environmental parameter and the tag distribution information, to ensure the priority execution of the emergency task, and the environmental parameter and the tag distribution information as basic scene data guarantee the adaptability of the strategy.

[0083] Further, the channel control module is connected with the strategy generation module, and is used for realizing dynamic cooperative control of the two channels according to the fusion strategy. For the automatic frequency hopping strategy, the channel control module monitors the interference signal strength of the current working frequency in real time, and when the interference signal strength exceeds the frequency switching threshold set by the automatic frequency hopping strategy, immediately switches to the preset low-interference frequency, such as a frequency hopping path, and avoids simultaneous frequency hopping of the two channels in the switching process through time slice distribution to ensure the stability of the switching; for the time division multiplexing strategy, the channel control module allocates the working time of the two channels through a timer according to the time slice length set by the time division multiplexing strategy, for example, when the tag density is high, the time slice length of each channel is extended to ensure that each channel has enough time to process the tags, and when the tag density is low, the time slice length is shortened to reduce unnecessary time waste, such as dynamic adjustment of the time slice; for the priority identification strategy, the channel control module sets the tag priority weight according to the priority identification strategy, and when a high-priority tag is read, the processing of the current ordinary tag is suspended, and the read-write operation of the high-priority tag is preferentially executed, and after the processing is completed, the ordinary tag processing is resumed to ensure the execution efficiency of the host computer instruction. The execution process of the channel control module needs to strictly follow the instructions of the strategy generation module, and at the same time, the current execution state, such as a frequency hopping completion signal, a time slice distribution state, and a priority identification execution result, is transmitted to the feedback adjustment module through a state feedback interface.

[0084] Further, the feedback adjustment module is connected with the channel control module and the strategy generation module, and is used for collecting the RFID operation results and the environmental parameter changes of the double channels in the channel control module, adjusting the parameters of the fusion strategy, and realizing dynamic optimization of the strategy. The RFID operation results include a tag recognition rate (a proportion of a number of successfully read tags in a unit time to a total number of tags) collected through a built-in counter of the reader, an error code rate (a proportion of an error bit number in a total bit number in a received signal), a missed reading rate (a proportion of a number of unread tags to the total number of tags), and a reading time of each tag (a time from identification to processing completion of a single tag), and the environmental parameter changes include an interference signal strength change amount (a difference between a current moment and a previous second interference signal strength), and a working temperature change amount (a difference between a current temperature and a preset reference temperature). The data is stored through a real-time database, and the feedback adjustment module regularly extracts the data for analysis. For example, when the error code rate of a certain channel continuously increases, the corresponding interference signal strength change amount is analyzed. If it is found that the interference signal strength has exceeded the current frequency switching threshold but has not triggered frequency hopping, it is indicated that the frequency switching threshold is set too high. At this time, the frequency switching threshold of the automatic frequency hopping strategy is adjusted to reduce the trigger threshold. If the missed reading rate of a certain channel increases due to an increase in tag density, it is indicated that the time slice length is insufficient at the current time. At this time, the time slice length of the time division multiplexing strategy is adjusted to prolong the working time of the channel. If the preferential identification strategy causes a too high processing delay of ordinary tags, it is indicated that the tag priority weight of the strategy is set too high. At this time, the tag priority weight of the preferential identification strategy is adjusted to balance the processing efficiency of the preferential task and the ordinary task. The adjusted parameters are transmitted to the strategy generation module through an internal bus to update the generation logic of the fusion strategy, for example, the adjusted frequency switching threshold is included in the training data of the decision tree algorithm to improve the accuracy of the next strategy generation.

[0085] It needs to be understood that the cooperation of each module is not a linear process, but dynamic. For example, the tag density change collected by the scene perception module triggers the strategy generation module to adjust the time slice length of the time division multiplexing strategy. The channel control module executes the adjusted time slice allocation. The feedback adjustment module collects the tag recognition rate after execution. If the recognition rate does not reach the expectation, the time slice length is adjusted again until the recognition rate is stable within the target range. This dynamic adjustment mechanism ensures the adaptive ability of the control system to the dynamic changes of the scene. For example, when the tag density suddenly increases, the scene perception module timely collects the tag density change. The strategy generation module quickly adjusts the time slice length. The channel control module immediately executes the new time slice allocation. The feedback adjustment module monitors the recognition rate change to ensure that the adjustment effect meets the expectation. The whole process is completed within seconds to realize real-time response to the scene changes.

[0086] The benefits of the embodiment are that multi-source data is acquired through the scene perception module, the strategy generation module fuses to generate a strategy suitable for the scene, the channel control module accurately executes the strategy, and the feedback adjustment module dynamically optimizes the strategy, forming a dynamic coordination mechanism, realizing the self-adaptation of the dual-channel RFID reader to the dynamic changes of the scene, and improving the stability of the label recognition rate and the processing efficiency. At the same time, the functions of each module are clearly divided, the data interaction and instruction transmission are realized through the internal bus, ensuring the reliability and scalability of the system, and the module parameters can be adjusted according to different application scenarios to adapt to the needs of various scenes such as retail, logistics and medical treatment.

[0087] Although the present application has been described above with reference to the preferred embodiments, it is to be understood that the application is not limited to the above-described embodiments, and various modifications and changes can be made by those skilled in the art without departing from the spirit of the application, and such modifications and changes shall fall within the scope of the appended claims and their equivalents.

Claims

1. A dual-channel RFID reader / writer control method based on a dynamic collaborative mechanism, characterized in that the steps include... include: Obtain environmental parameters for the current application scenario, including interference signal strength, operating temperature, and humidity. This includes tag distribution information such as tag density, location coordinates, and movement speed; it also includes host computer instructions for prioritizing the identification of tag ID prefixes and prioritizing the reading of tag data types, providing multi-source data support for dual-channel dynamic collaboration; A fusion strategy is generated based on the multi-source data. The fusion strategy includes an automatic frequency hopping strategy based on interference signal strength, a time division multiplexing strategy based on tag density, and a priority identification strategy based on host computer instructions, which are used to determine the working mode and coordination method of the dual channels. The operating frequencies of the two channels are switched according to the automatic frequency hopping strategy, the operating time slices of the two channels are allocated according to the time division multiplexing strategy, and the target tag read and write operations of the two channels are prioritized according to the priority identification strategy, so as to realize dynamic coordination of the two channels. Collect the operation results of dual-channel RFID and changes in environmental parameters, and adjust the frequency switching threshold of the automatic frequency hopping strategy, the time slice length of the time division multiplexing strategy, and the tag priority weight of the priority identification strategy to dynamically optimize the collaborative strategy. One step of the automatic frequency hopping strategy includes: when the interference signal strength exceeds a preset threshold, controlling the dual channels to switch to a preset interference-free frequency channel. The preset interference-free frequency channel is determined according to multi-region frequency configuration parameters, which include the frequency range and channel spacing of the current working area. One step of the time-division multiplexing strategy includes: dynamically allocating the working time slice length of the dual channels according to the tag density; when the tag density is higher than a first threshold, shortening the time slice length to increase the channel switching frequency and increase the tag recognition coverage; when the tag density is lower than a second threshold, extending the time slice length to reduce the channel switching overhead and improve the single-channel operation efficiency. The automatic frequency hopping strategy is implemented by using frequency hopping spread spectrum technology to switch the operating frequency of the dual channels according to a preset frequency hopping sequence. The frequency hopping sequence is dynamically generated based on the frequency regulations of the current working area and the strength of the interference signal to ensure that the dual channels operate in an interference-free frequency channel.

2. The dual-channel RFID reader control method based on a dynamic collaborative mechanism as described in claim 1, characterized in that, One step of the priority identification strategy includes: according to the priority identification tag type in the host computer instruction, controlling the dual channels to prioritize reading or writing data of the tag type when performing RFID operation. The priority identification tag type includes the protocol type of the electronic tag, the tag purpose, and the user to whom the tag belongs.

3. The dual-channel RFID reader control method based on a dynamic collaborative mechanism as described in claim 1, characterized in that, The time-division multiplexing strategy is implemented by using an internal real-time clock to achieve time synchronization between the two channels, ensuring that the two channels work alternately within the allocated time slices and avoiding signal interference between the channels. The accuracy of the time synchronization is less than 1 millisecond.

4. The dual-channel RFID reader control method based on a dynamic collaborative mechanism as described in claim 1, characterized in that, The priority identification strategy is implemented by inserting the target tag operation task into the dual-channel RFID operation queue, increasing the priority of the target tag operation task, ensuring that the target tag operation task is executed before other tag operation tasks, and the target tag conforms to the priority identification tag type in the host computer instruction.

5. The dual-channel RFID reader / writer control method based on a dynamic collaborative mechanism as described in claim 1, characterized in that, The RFID operation result acquisition includes real-time acquisition of the tag recognition rate, bit error rate, missed read rate and reading time of each tag in dual channels. The environmental parameter changes include the changes in interference signal strength and the changes in operating temperature. The acquisition frequency is at least once per second.

6. The dual-channel RFID reader control method based on a dynamic collaborative mechanism as described in claim 1, characterized in that, The adjustment of the automatic frequency hopping strategy includes: Machine learning algorithms are used to analyze the collected dual-channel RFID operation results and environmental parameter changes to predict the optimal frequency switching threshold, time slice length, and tag priority weight, thereby achieving self-optimization of the collaborative strategy. The training data for the machine learning algorithm includes historical scene perception data, collaborative strategies, and corresponding dual-channel RFID operation results. The adjusted collaboration strategy is sent to the host computer via a predefined communication protocol, and the adjusted collaboration strategy is executed after receiving the confirmation instruction from the host computer. If no confirmation instruction is received from the host computer within a preset time, the original collaborative strategy remains unchanged. The predefined communication protocol includes command frames, response frames, and notification frames. The command frame is used for the host computer to send instructions, the response frame is used for the reader to return results, and the notification frame is used for the reader to send status information.

7. A dual-channel RFID reader / writer control system based on a dynamic collaborative mechanism, used to implement the dual-channel RFID reader / writer control method based on a dynamic collaborative mechanism as described in any one of claims 1-6, characterized in that, include: The scene perception module is used to acquire environmental parameters, tag distribution information and host computer instructions of the current application scene, and provide multi-source data support for dual-channel dynamic collaboration; The strategy generation module, connected to the scene perception module, is used to generate a fusion strategy based on the multi-source data of the scene perception module. The fusion strategy includes an automatic frequency hopping strategy based on interference signal strength, a time division multiplexing strategy based on tag density, and a priority identification strategy based on host computer instructions, and determines the working mode and coordination method of the dual channels. The channel control module, connected to the strategy generation module, is used to switch the operating frequency of the two channels according to the automatic frequency hopping strategy, allocate the operating time slices of the two channels according to the time division multiplexing strategy, and control the two channels to prioritize the execution of target tag read and write operations according to the priority identification strategy, so as to realize the dynamic coordination of the two channels. The feedback adjustment module, connected to the channel control module and the strategy generation module, is used to collect the dual-channel RFID operation results and environmental parameter changes in the channel control module, and adjust the frequency switching threshold of the automatic frequency hopping strategy, the time slice length of the time division multiplexing strategy, and the tag priority weight of the priority identification strategy, so as to dynamically optimize the collaborative strategy.

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