UHF (Ultra High Frequency) tag checking control method and device and UHF tag reader-writer

Abstract

The invention discloses a UHF (Ultra High Frequency) tag checking control method and device and a UHF tag reader-writer, and the method comprises the steps: recording the number of effective tags checked at each frequency point when a frequency point is selected and a radio frequency field is started for tag checking; the effective labels refer to new labels checked under the frequency points; opening time and / or closing time are / is adjusted according to the recorded number of the effective labels; and when the next frequency point is selected to carry out tag checking, opening and / or closing the radio frequency field according to the adjusted field opening time and / or field closing time. By using the scheme of the invention, the UHF tag identification speed can be improved, and the equipment power consumption can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tag identification, in particular to a UHF tag inventory control method and device, and also to a UHF tag reader / writer. Background Art

[0002] RFID (Radio Frequency Identification) readers are key devices for implementing RFID technology. They are used to read and write data in RFID tags and are widely used in various industries and fields. UHF (Ultra-high Frequency) is a radio wave with a frequency of 300 to 3000MHz, commonly used in mobile communications and broadcasting and television. When identifying a tag, a UHF RFID reader (the center frequency point of conventional applications is 900MHz) turns on the radio frequency field at multiple frequencies for a period of time, performs tag identification, reading and writing during this time, and then turns off the radio frequency field and switches to the next frequency point.

[0003] At a certain frequency point, the RF field is on for t1, off for t2, and the total switching time is T. The on-duty cycle is defined as D = t1 / T. The on-duty cycle D is directly related to power consumption and temperature rise. The larger the on-duty cycle, the longer the on-duty time per unit time, the more energy consumed and the greater the temperature rise. The on-duty cycle D is also directly related to the tag recognition speed. The larger the on-duty cycle, the longer the on-duty time per unit time, the more tags are recognized and the faster the recognition speed. It can be seen that there is a conflict between the tag recognition speed and power consumption and temperature rise, that is, if the on-duty cycle is large, the tag recognition speed is fast and the number of recognitions is large, but the power consumption and temperature rise are large; if the on-duty cycle is small, the tag recognition speed is slow and the number of recognitions is small, but the power consumption and temperature rise are small.

[0004] In the prior art, in order to reduce power consumption and lower temperature rise, additional off-field time is usually added after a fixed number of on-off field identifications, that is, the RF on-off field time is regularly adjusted. Since there is a conflict between the tag identification speed and quantity and power consumption and temperature rise, this adjustment method has the following problems: in the early stage of tag identification, a large number of tags are not identified, but the tag reader cannot continuously count the tags for a long time, so the tag identification speed is slow and the number is small; in the late stage of tag identification, a large number of tags have been identified, but the tag reader still uses the same on-off field strategy, resulting in wasted power consumption and the temperature rise cannot be reduced. Summary of the invention

[0005] The embodiment of the present invention provides a UHF tag inventory control method and device, and a UHF tag reader / writer to solve the conflict problem between UHF tag recognition speed and power consumption and temperature rise, improve UHF tag recognition speed, and reduce device power consumption.

[0006] On the one hand, an embodiment of the present invention provides a UHF tag inventory control method, the method comprising:

[0007] When selecting a frequency point to start the RF field for tag inventory, the number of valid tags counted at each frequency point is recorded; the valid tags refer to the new tags counted at the frequency point;

[0008] Adjusting the opening and / or closing times based on the number of valid tags recorded;

[0009] When the next frequency point is selected for tag inventory, the RF field is turned on and / or off according to the adjusted opening time and / or closing time.

[0010] Optionally, the method further comprises:

[0011] Setting a label information table, wherein the label information table is used to record information of the labels that have been counted;

[0012] After counting the labels, searching the label information table;

[0013] If the information of the tag does not exist in the tag information table, it is determined that the tag is a valid tag, and the information of the tag is added to the tag information table.

[0014] Optionally, the tag information is a unique identifier of the tag or a characteristic value of the unique identifier of the tag.

[0015] Optionally, adjusting the opening time and / or closing time according to the number of recorded valid tags includes:

[0016] Adjust the opening and closing time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency; or

[0017] Adjust the opening time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency; or

[0018] Adjust the closing time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency.

[0019] Optionally, adjusting the opening time and the closing time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency includes: if the number of valid tags counted at the current frequency is greater than the number of valid tags counted at the previous frequency, increasing the opening time and decreasing the closing time; otherwise decreasing the opening time and increasing the closing time.

[0020] Optionally, the magnitude of the opening time and the closing time is the same or different each time the adjustment is made, and the magnitude of the increase and the magnitude of the decrease are the same or different each time the adjustment is made.

[0021] Optionally, adjusting the opening time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency includes: if the number of valid tags counted at the current frequency is greater than the number of valid tags counted at the previous frequency, increasing the opening time and keeping the closing time unchanged; otherwise, reducing the opening time and keeping the closing time unchanged.

[0022] Optionally, adjusting the closing time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency includes: if the number of valid tags counted at the current frequency is greater than the number of valid tags counted at the previous frequency, keeping the opening time unchanged and reducing the closing time; otherwise keeping the opening time unchanged and increasing the closing time.

[0023] Optionally, the total inventory time at each frequency point remains fixed or variable.

[0024] On the other hand, an embodiment of the present invention further provides a UHF tag inventory control device, the device comprising:

[0025] The recording module is used to select a frequency point to start the radio frequency field for tag inventory, and record the number of valid tags counted at each frequency point;

[0026] A dynamic adjustment module, used for adjusting the opening time and / or closing time according to the number of recorded valid tags;

[0027] The radio frequency field control module is used to open and / or close the radio frequency field according to the adjusted opening time and / or closing time when selecting the next frequency point for tag inventory.

[0028] Optionally, the device further comprises:

[0029] A setting module, used to set a label information table, wherein the label information table is used to record information of the counted labels;

[0030] The recording module is further used to search the tag information table; if the tag information does not exist in the tag information table, determine that the tag is a valid tag, add the tag information to the tag information table, and update the recorded number of valid tags.

[0031] On the other hand, an embodiment of the present invention further provides a UHF tag reader / writer, comprising: a tag identification module, and the aforementioned UHF tag inventory control device;

[0032] The UHF tag inventory control device is used to select the frequency point to control the opening and closing of the radio frequency field, and dynamically adjust the opening time and / or closing time of the radio frequency field corresponding to each frequency point;

[0033] The tag identification module is used to perform tag inventory during the opening time and stop tag inventory during the closing time.

[0034] On the other hand, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the aforementioned UHF tag inventory control method are executed.

[0035] On the other hand, an embodiment of the present invention further provides a control device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and the processor executes the steps of the aforementioned UHF tag inventory control method when running the computer program.

[0036] The UHF tag inventory control method and device provided by the embodiment of the present invention records the number of valid tags counted at each frequency point each time a tag inventory is performed; adjusts the opening time and / or closing time according to the recorded number of valid tags; and when selecting the next frequency point for tag inventory, turns on and / or closes the radio frequency field according to the adjusted opening time and / or closing time. The scheme of the present invention dynamically adjusts the radio frequency opening and closing time by comparing the number of valid tags counted at two consecutive frequency points. In the early stage of tag identification, the duty cycle can be increased to quickly identify the tag; in the late stage of tag identification, the duty cycle can be reduced to reduce power consumption and reduce temperature rise; thereby effectively improving the UHF tag identification speed and reducing the power consumption of the equipment.

[0037] Accordingly, the UHF tag reader / writer provided by the embodiment of the present invention, including the above-mentioned UHF tag inventory control device, has the advantages of fast recognition speed, low power consumption and low temperature rise. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a flow chart of the UHF tag inventory control method provided by an embodiment of the present invention;

[0039] Figure 2 This is a specific implementation flow chart of the UHF tag inventory control method provided by an embodiment of the present invention;

[0040] Figure 3 It is a structural schematic diagram of a UHF tag inventory control device provided by an embodiment of the present invention;

[0041] Figure 4 It is another structural schematic diagram of the UHF tag inventory control device provided by an embodiment of the present invention;

[0042] Figure 5 It is a structural schematic diagram of a UHF tag reader / writer provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The principle and spirit of the present invention will be described below with reference to the exemplary embodiments shown in the accompanying drawings. It should be understood that these embodiments are described only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way.

[0044] In view of the problem that the existing UHF RFID reader-writer regularly adjusts the RF switching time in order to reduce power consumption and temperature rise when performing tag inventory, the embodiment of the present invention provides a UHF tag inventory control method and device, which dynamically adjusts the RF on and off time by comparing the number of valid tags counted at two consecutive frequency points. In the early stage of tag identification, the duty cycle can be increased to quickly identify the tag; in the late stage of tag identification, the duty cycle can be reduced to reduce power consumption and temperature rise.

[0045] like Figure 1 FIG. 1 is a flow chart of a UHF tag inventory control method provided by an embodiment of the present invention, comprising the following steps:

[0046] Step 101, when selecting a frequency point and starting a radio frequency field to perform tag inventory, the number of valid tags counted at each frequency point is recorded; the valid tags refer to new tags counted at the frequency point.

[0047] The valid tag refers to a newly counted tag. In a non-limiting embodiment, the information of the counted tags can be recorded by setting a tag information table; after the tags are counted, the tag information table is searched; if the tag information does not exist in the tag information table, the tag is determined to be a valid tag, and the tag information is added to the tag information table.

[0048] It should be noted that the information of the tag may be a unique identifier of the tag or a characteristic value of the unique identifier of the tag. In other words, the unique identifier of the counted tag may be directly recorded in the tag information table. In order to further save storage space, the characteristic value of the identifier may also be recorded, and the characteristic value may be calculated by a certain algorithm or set by a certain mapping relationship, which is not limited in the embodiment of the present invention.

[0049] For each frequency point, the number of new tags counted at the frequency point is the number of valid tags at the frequency point.

[0050] Step 102: adjusting the opening time and / or closing time according to the number of recorded valid tags.

[0051] Specifically, the opening time and / or closing time can be adjusted according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency. That is, only the RF opening time T1 or closing time T2 can be adjusted. In this case, the total inventory time T=T1+T2 will also change. Alternatively, the RF opening time T1 and closing time T2 can be adjusted at the same time. In this case, the total inventory time T=T1+T2 can remain unchanged or change at the same time, which is not limited in this embodiment of the present invention.

[0052] For example, a non-restrictive adjustment method is as follows: if the number of valid tags counted at the current frequency is greater than the number of valid tags counted at the previous frequency, increase the opening time and reduce the closing time; otherwise reduce the opening time and increase the closing time.

[0053] It should be noted that the magnitude of the opening time and the closing time may be the same or different each time the adjustment is made, and the magnitude of the increase and the magnitude of the decrease may be the same or different each time the adjustment is made.

[0054] For another example, another non-restrictive adjustment method is as follows: if the number of valid tags counted at the current frequency is greater than the number of valid tags counted at the previous frequency, the opening time is increased and the closing time remains unchanged; otherwise, the opening time is reduced and the closing time remains unchanged.

[0055] For another example, another non-restrictive adjustment method is as follows: if the number of valid tags counted at the current frequency is greater than the number of valid tags counted at the previous frequency, the opening time is kept unchanged and the closing time is reduced; otherwise, the opening time is kept unchanged and the closing time is increased.

[0056] It should be noted that, in the above two cases where only the opening time or the closing time is adjusted, the total inventory time at each frequency point can be kept fixed or variable, which is not limited in this embodiment of the present invention.

[0057] Step 103, when selecting the next frequency point for tag inventory, the radio frequency field is turned on and / or off according to the adjusted opening time and / or closing time.

[0058] Reference Figure 2 , Figure 2 A specific implementation flow chart of the UHF tag inventory control method provided by an embodiment of the present invention is shown, including the following steps:

[0059] Step 201, initializing the opening time t1, closing time t2, and the total opening and closing time T=t1+t2.

[0060] Step 202: clear the tag feature value table, where the tag feature value table is used to store the feature value of the tag unique identifier.

[0061] The possibility of conflict between the feature values ​​of different tags is small, and it can be used to determine whether the current tag is a new inventory tag.

[0062] Step 203: the number of valid tags is reset to zero.

[0063] The number of new tags counted at each frequency point is the number of valid tags at that frequency point.

[0064] Step 204: switch the RF operating frequency to the next frequency point.

[0065] Step 205, turning on the radio frequency field.

[0066] Step 206, perform inventory labeling.

[0067] Step 207, determine whether the tag is counted; if so, execute step 208; otherwise, execute step 212.

[0068] Step 208, calculating the characteristic value of the tag unique identifier.

[0069] Step 209 , determining whether the feature value exists in the tag feature value table; if not, executing step 210 ; otherwise, executing step 212 .

[0070] Step 210: record the feature value in a tag feature value table.

[0071] Step 211, the number of valid tags is increased by 1.

[0072] Step 212 , determining whether the RF field is turned on for a time shorter than t1 ; if so, executing step 206 ; otherwise, executing step 213 .

[0073] Step 213, turning off the radio frequency field, the turning off time is t2.

[0074] Step 214, determine whether the number of valid tags counted at the current frequency point is greater than that at the previous frequency point; if not, execute step 215; if yes, execute step 216.

[0075] Step 215, the opening time t1 is reduced by a fixed amplitude Tdown, but is not allowed to be less than the minimum lower limit Tmin; the closing time t2 = T-t1; then jump to execute step 217.

[0076] Step 216, the opening time t1 increases by a fixed amplitude Tup, but is not allowed to exceed T; the closing time t2 = T-t1.

[0077] Step 217, determine whether an end inventory instruction is received; if not, execute step 203; if yes, end the process.

[0078] The UHF tag inventory control method provided in the embodiment of the present invention dynamically adjusts the RF switch time by comparing the number of new tags counted at two consecutive frequencies. Moreover, this adjustment can increase the inventory opening time and improve the duty cycle when there are many tags that have not been counted, such as in the early stage of tag identification, so that the tags can be quickly identified; when the number of new tags is small, such as in the late stage of tag identification, the opening time can be reduced and the duty cycle can be reduced, so that power consumption and temperature rise can be reduced. It can be seen that the UHF tag inventory control method of the present invention can achieve the ideal effect of fast speed, large total amount, low power consumption and low temperature rise in UHF tag identification by dynamically and adaptively adjusting the opening and closing time.

[0079] Accordingly, an embodiment of the present invention further provides a UHF tag inventory control device, such as Figure 3 The UHF tag inventory control device 300 includes the following modules:

[0080] The recording module 301 is used to select a frequency point to start the radio frequency field for tag inventory, and record the number of valid tags counted at each frequency point;

[0081] A dynamic adjustment module 302, used to adjust the opening time and / or closing time according to the number of recorded valid tags;

[0082] The radio frequency field control module 303 is used to turn on and / or turn off the radio frequency field according to the adjusted opening time and / or closing time when selecting the next frequency point for tag inventory.

[0083] In a non-limiting embodiment, a tag information table may be set to record the information of the counted tags, so that it is possible to determine whether the counted tags are valid tags by looking up the table. Figure 4 , which is another non-limiting structural schematic diagram of the UHF tag inventory control device provided by an embodiment of the present invention.

[0084] Reference Figure 4 and Figure 3 ,and Figure 3 The difference of the embodiment shown is that Figure 4 In the illustrated embodiment, the UHF tag inventory control device 300 further includes: a setting module 401, which is used to set a tag information table 40, and the tag information table 40 is used to record the information of the inventoryed tags.

[0085] Accordingly, in this embodiment, the recording module 301 is also used to search the label information table 40; if the information of the label does not exist in the label information table 40, the label is determined to be a valid label, and the information of the label is added to the label information table 40. In addition, the number of valid labels recorded is also updated.

[0086] Figure 3 The dynamic adjustment module 302 can adjust the opening time and / or closing time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency. The specific adjustment method can be referred to the description in the previous embodiment of the method of the present invention, which will not be repeated here.

[0087] Accordingly, an embodiment of the present invention further provides a UHF tag reader / writer, such as Figure 5 The figure shows a structural diagram of the UHF tag reader.

[0088] The tag reader 500 includes: a tag identification module 501 and the above-mentioned UHF tag inventory control device 300. Among them:

[0089] The UHF tag inventory control device 300 is used to select a frequency point to control the opening and closing of the radio frequency field, and dynamically adjust the opening time and / or closing time of the radio frequency field corresponding to each frequency point;

[0090] The tag identification module 501 is used to perform tag inventory during the opening time and stop the tag inventory during the closing time.

[0091] The UHF tag inventory control device provided in the embodiment of the present invention dynamically adjusts the RF switch field time by comparing the number of new tags counted at two consecutive frequencies. Moreover, this adjustment can increase the inventory opening time and improve the duty cycle when there are many tags that have not been counted, such as in the early stage of tag identification, so that the tags can be quickly identified; when the number of new tags is small, such as in the late stage of tag identification, the opening time can be reduced and the duty cycle can be reduced, so that power consumption and temperature rise can be reduced. Accordingly, the UHF tag reader / writer including the above-mentioned UHF tag inventory control device has the advantages of fast identification speed, low power consumption and low temperature rise.

[0092] For the specific implementation of each module in the UHF tag inventory control device of the present invention, reference may be made to the description in the above method embodiment of the present invention.

[0093] In a specific implementation, each module / unit included in each device or product described in the above embodiments may be a software module / unit or a hardware module / unit, or may be partially a software module / unit and partially a hardware module / unit. For example, for each device or product applied to or integrated in a chip, each module / unit included therein may be implemented in the form of hardware such as circuits, or at least some of the modules / units may be implemented in the form of software programs, which run on a processor integrated inside the chip, and the remaining (if any) modules / units may be implemented in the form of hardware such as circuits; for each device or product applied to or integrated in a chip module, each module / unit included therein may be implemented in the form of hardware such as circuits, and different modules / units may be located in the same component (such as a chip, circuit module, etc.) or different components of the chip module, or at least some of the modules / units may be implemented in the form of hardware such as circuits. The element can be implemented in the form of a software program, which runs on a processor integrated inside the chip module, and the remaining (if any) modules / units can be implemented in the form of hardware such as circuits; for various devices and products applied to or integrated in the terminal, the various modules / units contained therein can be implemented in the form of hardware such as circuits, and different modules / units can be located in the same component (for example, chip, circuit module, etc.) or in different components in the terminal, or, at least some modules / units can be implemented in the form of a software program, which runs on a processor integrated inside the terminal, and the remaining (if any) modules / units can be implemented in the form of hardware such as circuits.

[0094] The present application also provides a storage medium, which is a computer-readable storage medium having a computer program stored thereon, which can execute Figure 1 and Figure 2 The storage medium may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc. The storage medium may also include a non-volatile memory or a non-transitory memory, etc.

[0095] Accordingly, an embodiment of the present application further provides a control device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and the processor can execute the above-mentioned Figure 1 and Figure 2 Part or all of the steps of the UHF tag inventory control method.

[0096] It should be understood that the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article indicates that the associated objects before and after are in an "or" relationship.

[0097] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0098] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented using software, the above embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means.

[0099] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0100] In the several embodiments provided in the present application, it should be understood that the disclosed methods, devices and systems can be implemented in other ways. For example, the device embodiments described above are merely schematic; for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation; for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0101] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0102] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may be physically arranged separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0103] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform some steps of the method described in each embodiment of the present application.

[0104] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application shall be subject to the scope defined by the claims.

Claims

1. A UHF tag inventory control method, characterized in that: The method comprises: When selecting a frequency point to start the RF field for tag inventory, the number of valid tags counted at each frequency point is recorded; the valid tags refer to the new tags counted at the frequency point; Adjusting the opening and / or closing times based on the number of valid tags recorded; When the next frequency point is selected for tag inventory, the RF field is turned on and / or off according to the adjusted opening time and / or closing time.

2. The UHF tag inventory control method according to claim 1, characterized in that: The method further comprises: Setting a label information table, wherein the label information table is used to record information of the labels that have been counted; After counting the labels, searching the label information table; If the information of the tag does not exist in the tag information table, it is determined that the tag is a valid tag, and the information of the tag is added to the tag information table.

3. The UHF tag inventory control method according to claim 2, characterized in that: The tag information is a unique identifier of the tag or a characteristic value of the unique identifier of the tag.

4. The UHF tag inventory control method according to any one of claims 1 to 3, characterized in that: The adjusting of the opening time and / or closing time according to the number of recorded valid tags includes: Adjust the opening and closing time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency; or Adjust the opening time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency; or Adjust the closing time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency.

5. The UHF tag inventory control method according to claim 4, characterized in that: The adjusting of the opening and closing time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency includes: If the number of valid tags counted at the current frequency is greater than the number of valid tags counted at the previous frequency, the opening time is increased and the closing time is decreased; otherwise, the opening time is decreased and the closing time is increased.

6. The UHF tag inventory control method according to claim 5, characterized in that: The magnitude of the opening time and the closing time is the same or different each time the adjustment is made, and the magnitude of the increase and the magnitude of the decrease are the same or different each time the adjustment is made.

7. The UHF tag inventory control method according to claim 4, characterized in that: The adjusting of the opening time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency includes: If the number of valid tags counted at the current frequency is greater than the number of valid tags counted at the previous frequency, the opening time is increased and the closing time remains unchanged; otherwise, the opening time is reduced and the closing time remains unchanged.

8. The UHF tag inventory control method according to claim 4, characterized in that: The adjusting of the closing time according to the number of valid tags counted at the current frequency and the number of valid tags counted at the previous frequency includes: If the number of valid tags counted at the current frequency is greater than the number of valid tags counted at the previous frequency, the opening time remains unchanged and the closing time is reduced; otherwise, the opening time remains unchanged and the closing time is increased.

9. The UHF tag inventory control method according to claim 4, characterized in that: The total inventory time at each frequency point remains fixed or variable.

10. A UHF tag inventory control device, characterized in that: The device comprises: The recording module is used to select a frequency point to start the radio frequency field for tag inventory, and record the number of valid tags counted at each frequency point; A dynamic adjustment module, used for adjusting the opening time and / or closing time according to the number of recorded valid tags; The radio frequency field control module is used to open and / or close the radio frequency field according to the adjusted opening time and / or closing time when selecting the next frequency point for tag inventory.

11. The UHF tag inventory control device according to claim 10, characterized in that: The device also includes: A setting module, used to set a label information table, wherein the label information table is used to record the information of the counted labels; The recording module is further used to search the tag information table; if the tag information does not exist in the tag information table, determine that the tag is a valid tag, add the tag information to the tag information table, and update the recorded number of valid tags.

12. A UHF tag reader, characterized in that: include: A tag identification module, and a UHF tag inventory control device as claimed in claim 10 or 11; The UHF tag inventory control device is used to select the frequency point to control the opening and closing of the radio frequency field, and dynamically adjust the opening time and / or closing time of the radio frequency field corresponding to each frequency point; The tag identification module is used to perform tag inventory during the opening time and stop tag inventory during the closing time.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the UHF tag inventory control method according to any one of claims 1 to 9 are executed.

14. A control device, comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor runs the computer program, the steps of the UHF tag inventory control method according to any one of claims 1 to 9 are performed.

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