Method for assisting card reader to implement card searching, card searching method, NFC tag, electronic device, storage medium, and computer program

Abstract

To provide a method for assisting a card reader to implement card searching, an NFC tag, a program, and a storage medium.SOLUTION: A method includes the steps of: performing signal detection within a preset detection range; generating an excitation signal when a low power card detection (LPCD) signal is detected, the LPCD signal being issued by a card reader device in a low power card detection mode; and sending the excitation signal, to switch the mode of the card reader device from the low power card detection mode to a normal card searching mode.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] One or more embodiments of the present specification relate to the field of wireless communication, and in particular to a method for assisting a card reader to realize card search, a card search method, and an NFC tag. [Background technology]

[0002] NFC (Near Field Communication) is a short-range wireless communication technology that enables convenient interaction and data transmission between two NFC devices or between an NFC device and an NFC tag.

[0003] In related technology, mobile devices such as mobile phones can act as NFC devices with card reader functionality and read information stored in NFC tags, but in consideration of the issue of operating time of mobile devices, LPCD (Low Power Card Detection) mode is usually adopted. When the mobile device approaches an NFC tag, it switches to normal card search mode. Summary of the Invention [Problem to be solved by the invention]

[0004] However, the sensing distance of a mobile device in LPCD mode to an NFC tag decreases, and the sensing sensitivity decreases, which causes the mobile device to be unable to switch to normal card search mode. This in turn significantly reduces the success rate of the mobile device in sensing an NFC tag, affecting the user experience.

[0005] In view of this, one or more embodiments of the present specification provide a method for assisting a card reader in realizing card searching, a card searching method, and an NFC tag. [Means for solving the problem]

[0006] To achieve the above object, one or more embodiments of the present specification provide the following technical solutions.

[0007] According to a first aspect of one or more embodiments of the present specification, there is provided a method for detecting a signal transmitted from an NFC tag to an NFC tag, the method comprising: performing signal detection within a preset detection range; generating an excitation signal when detecting a low power card detect LPCD signal emitted by the card reader device in a low power card detect mode; sending the excitation signal to cause the card reader device to switch from a low-power card detection mode to a normal card search mode.

[0008] According to a second aspect of one or more embodiments of the present specification, there is provided a card reader device, comprising: in a low power card detect mode, issuing a low power card detect LPCD signal; and switching from the low-power card detection mode to a normal card search mode upon receiving an excitation signal emitted by an NFC tag when the LPCD signal is detected.

[0009] According to a third aspect of one or more embodiments herein, an NFC coil used to sense a radio signal within a predetermined detection range, the radio signal including a low-power card detection LPCD signal emitted by a card reader device in a low-power card detection mode; an NFC tag chip connected to the NFC coil and used to store written tag data; The present invention proposes an NFC tag comprising: an excitation module connected to the NFC coil, the excitation module being used to generate and emit an excitation signal through the NFC coil when it is determined that the NFC coil has sensed the LPCD signal, thereby switching the card reader device from a low-power card detection mode to a normal card search mode.

[0010] According to a fourth aspect of one or more embodiments of the present specification, there is proposed an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the device realizes the method according to the first or second aspect.

[0011] According to a fifth aspect of one or more embodiments of the present specification, there is proposed a computer-readable storage medium having stored thereon a computer program that, when executed by a processor, implements the steps of the method according to the first or second aspect.

[0012] According to a sixth aspect of one or more embodiments of the present specification, a computer program product is proposed, comprising a computer program / instructions that, when executed by a processor, implements the method according to the first or second aspect above. [Effects of the Invention]

[0013] In the technical solution provided in this specification, the NFC tag performs signal detection within a preset detection range, and when it detects the LPCD signal emitted by the card reader device in the low-power card detection mode, it may generate an excitation signal to stimulate the card reader device to switch from the low-power card detection mode to the normal card search mode. By applying the technical solution provided in this specification, the NFC tag can detect the LPCD signal by itself and actively transmit the excitation signal, ensuring that the card reader device can exit the low-power mode and perform normal card search, greatly improving the success rate of mobile devices detecting NFC tags and improving the user experience.

[0014] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the embodiments herein. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is an architecture schematic diagram of a short-range communication system provided by one exemplary embodiment; [Figure 2] 1 is a flowchart of a method for assisting a card reader to realize card searching provided by an exemplary embodiment; [Figure 3] 1 is a flowchart of a card search method provided by one exemplary embodiment. [Figure 4] 1 is a schematic diagram of an NFC tag according to one exemplary embodiment; [Figure 5] FIG. 2 is a block diagram of a schematic diagram of an excitation module provided by one exemplary embodiment. [Figure 6] FIG. 1 is a sequence diagram of a card search process provided by one exemplary embodiment. [Figure 7(a)] FIG. 10 is a schematic diagram of a signal waveform during card search provided by one exemplary embodiment. [Figure 7(b)] FIG. 10 is a schematic diagram of a signal waveform during card search provided by one exemplary embodiment. [Figure 7(c)] FIG. 10 is a schematic diagram of a signal waveform during card search provided by one exemplary embodiment. [Figure 8] 1 is a schematic diagram of a device according to one exemplary embodiment. [Figure 9] FIG. 1 is a block diagram of an apparatus for assisting a card reader to realize card searching according to one exemplary embodiment. [Figure 10] 1 is a block diagram of a card search device provided by one exemplary embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0016] Reference will now be made in detail to exemplary embodiments illustrated in the drawings. Where the following description refers to the drawings, identical numerals in different drawings refer to identical or similar elements unless otherwise noted. The embodiments described in the following exemplary embodiments do not represent all embodiments that may be consistent with one or more embodiments herein. Rather, they are merely examples of apparatus and methods that may be consistent with some aspects of one or more embodiments herein, as detailed in the appended claims.

[0017] It should be noted that in other embodiments, the steps of the corresponding method may not necessarily be performed in the order shown and described herein. In some other embodiments, the method may include more or fewer steps than those described herein. In addition, a single step described herein may be decomposed and described as multiple steps in other embodiments, while multiple steps described herein may be combined and described as a single step in other embodiments.

[0018] All user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to analytical data, stored data, display data, etc.) in this specification are information and data for which the user's permission has been obtained or for which sufficient permission has been obtained from each party, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions, and corresponding operation entries are provided for the user to select permission or denial.

[0019] NFC (Near Field Communication) is a short-range wireless communication technology that enables close-range communication between two NFC devices. It also enables interaction between NFC devices and NFC tags, such as data transmission, writing, and reading. Here, the NFC device is an active device with card reader functionality, i.e., an NFC card reader. The NFC tag is a passive device that does not actively emit any signals or data and can only function when stimulated by an active device. Accordingly, NFC has two communication modes: active mode and passive mode. Active mode supports interaction between two NFC devices. Both the initiator and target devices are NFC devices, and they must actively generate a radio frequency field when transmitting data to each other. On the other hand, the passive mode should correspond to the interaction between the NFC device and the NFC tag, in which the NFC device (NFC card reader) is the initiator device, also called the master device, which uses energy provided by another power supply device to provide a radio frequency field and transmits signal data to the target device, the NFC tag, which is also called the slave device, which passively responds to the signal emitted by the master device without generating a radio frequency field.

[0020] In the related art, a mobile device with an NFC card reader function, such as a mobile phone, may be considered an NFC device in the passive mode. When the mobile device approaches another NFC tag, a 13.56 MHz radio frequency field is established between the two as a short-range communication field, and data can be transmitted and exchanged through this communication field. However, due to the issue of battery life, manufacturers of mobile devices, such as mobile phones, have set a goal of low power consumption for the NFC function and accordingly implemented a series of low-power restrictions and optimizations for the NFC card reader function, such as adopting the low-power card detection (LPCD) mode. In the LPCD mode, when there is no NFC tag nearby, the mobile device turns off the radio frequency field and only transmits a low-power detection signal to reduce energy consumption. However, when the mobile device approaches an NFC tag, it detects the effect of the NFC tag on the detection signal, and then exits the LPCD mode and searches for the NFC tag in normal mode.

[0021] However, current mobile devices usually do not achieve ideal results when detecting NFC tags in LPCD mode: Because the signal strength emitted by a mobile device in LPCD mode is weak, the influence of the NFC tag on this signal is also reduced accordingly, making it impossible for the mobile device to determine whether an NFC tag is present nearby based on the signal variation value, resulting in the mobile device being unable to obtain an accurate determination result and being unable to switch to normal card search mode, which significantly reduces the success rate of the mobile device in detecting NFC tags and affects the user experience.

[0022] To solve the above problems, this specification proposes a method and an NFC tag for assisting a card reader in card search, in which the NFC tag performs signal detection within a preset detection range, and when it detects an LPCD signal emitted by a card reader device in low-power card detection mode, it may generate an excitation signal to stimulate the card reader device to switch from the low-power card detection mode to the normal card search mode.

[0023] 1 is a schematic architecture diagram of a near field communication system according to one exemplary embodiment. As shown in FIG. 1, the system may include a mobile device 11 and several devices equipped with NFC tags, such as device 12 and device 13.

[0024] The mobile device 11 should be a type of electronic device with an NFC card reader function available to a user, such as a mobile phone. In practice, the user may obviously use other types of electronic devices, such as tablet devices, laptops, personal digital assistants (PDAs), and wearable devices (e.g., smart glasses, smart watches, etc.), and one or more embodiments of the present specification are not limited thereto. During execution, the mobile device may execute an application program to realize the NFC-related functions of the application. For example, when the mobile device executes a payment service application program, it may detect payment data in an NFC tag, allowing the user to jump to a payment page and complete a quick payment.

[0025] It should be noted that the application program of the payment service application may be pre-installed on the mobile device, and the application may be launched and executed on the mobile device. Of course, when adopting online applications such as HTML5 technology, the application may be obtained and executed without the need to install a corresponding program on the mobile device.

[0026] Mobile device 11 and devices 12 and 13 equipped with NFC tags can communicate and transmit data between them via electromagnetic waves. Devices 12 and 13 may be any devices equipped with NFC tags, such as deposit terminal devices, payment code cards, electronic door locks, and entrance / exit gates. Of course, when a mobile device is equipped with an NFC tag, devices 12 and 13 may be the above-mentioned mobile devices, and this specification is not limited thereto.

[0027] 2 is a flowchart of a method for assisting a card reader in realizing card searching according to an exemplary embodiment. As shown in FIG. 2, the method may be applied to an NFC tag (e.g., may be disposed on the device 12, 13 shown in FIG. 1) and may include the following steps:

[0028] S201: Signal detection is performed within a preset detection range.

[0029] In one embodiment, the NFC tag should detect all signals within a preset detection range, which may include LPCD signals. The preset detection range should be the maximum range that the NFC tag's detection function can cover, and the specific value depends on various factors, including the power of the signal transceiver, antenna gain, environmental conditions, etc.

[0030] S202: Generate an excitation signal when detecting a low power card detection LPCD signal emitted by the card reader device in a low power card detection mode.

[0031] In one embodiment, the low-power card detection LPCD signal is emitted by the card reader device in a low-power card detection mode to detect whether an NFC tag is present in its vicinity. Since various signals have corresponding characteristics, such as different durations and amplitude change trends, the NFC tag may use these characteristics to determine whether an LPCD signal emitted from the card reader device is present within a predetermined detection range, and generate an excitation signal if it determines that an LPCD signal is present. The parameters required for generating the excitation signal may be set by those skilled in the art according to the actual situation, and may typically be set as a signal in a frequency band around 13.56 MHz, for example, between 12 and 15 MHz, without any limitation thereto.

[0032] S203: Sending the excitation signal causes the card reader device to switch from a low-power card detection mode to a normal card search mode.

[0033] In one embodiment, when the NFC tag emits the excitation signal generated in the embodiment, it stimulates the card reader device to switch from the current low-power card detection mode to the normal card search mode. Specifically, when the card reader device receives this excitation signal, it can also analyze the signal characteristics of this signal to determine whether it needs to exit the LPCD mode. The normal card search mode should be a card search mode with higher power consumption than the LPCD mode. In the normal card search mode, the card reader emits an activation signal to the NFC tag to obtain a desired NFC tag response. If the NFC tag responds, the activation is considered successful, and data can then be exchanged between the card reader and the NFC tag.

[0034] The timing of transmitting the excitation signal does not need to be synchronized with the transmission period of the LPCD signal, and the card reader device can receive the excitation signal at any time to achieve mode switching. After detecting the LPCD signal, the NFC tag may generate and transmit the excitation signal immediately without any special delay. Of course, those skilled in the art may set the transmission timing according to actual needs, and this specification does not limit this.

[0035] As can be seen from the above examples, by applying the technical solution of this specification, the NFC tag can detect the LPCD signal by itself and actively transmit an excitation signal, ensuring that the card reader device can exit the low power consumption mode and perform normal card search, greatly improving the success rate of mobile devices detecting NFC tags and improving the user experience.

[0036] In one embodiment, to ensure that the emitted excitation signal can achieve the expected goal, i.e., the excitation signal can stimulate the card reader device to smoothly switch modes, when the NFC tag detects a low power card detection LPCD signal, the NFC tag may further determine whether the LPCD signal meets the condition that requires the NFC tag to send an excitation signal.

[0037] Specifically, the NFC tag may acquire the signal characteristics of the LPCD signal. Just as various signals have corresponding characteristics, the LPCD signals emitted by different card reader devices also differ. The signal characteristics may include, for example, a signal interval period, a signal size, and a signal duration. For example, when the signal interval time is different, device A may emit an LPCD signal once every 200 milliseconds, while device B may emit an LPCD signal once every 800 milliseconds. When the signal size is different, the LPCD signal emitted by device A may have an amplitude of -20 dBm, while the LPCD signal emitted by device B may have an amplitude of -30 dBm. When the signal transmission strategy is different, the difference lies in whether the device emits an LPCD signal several times and then performs one normal power card search. For example, device A emits only an LPCD signal in LPCD mode, while device B emits four LPCD signals, then one normal power activation signal, and then four more LPCD signals, and so on. It should be noted that when acquiring signal characteristics, the NFC tag may acquire any combination of one or more of the above characteristics, and this specification does not limit the types and number of signal characteristics it acquires.

[0038] In this embodiment, card reader devices may be classified into two types: a first type of card reader device can smoothly switch from LPCD mode to normal card search mode upon receiving an excitation signal; and a second type of card reader device can wake up an emulation NFC tag pre-installed in the card reader device upon receiving an excitation signal. For example, some types of mobile phones cannot wake up an NFC transit card, NFC access card, etc. in the mobile phone in response to the excitation signal and switch modes. In this embodiment, the second type of device is a target-type device, i.e., a target-type device may wake up a pre-installed emulation NFC tag upon receiving an excitation signal in the low-power card detection mode. Different card reader devices emit different LPCD signals, which can be represented by the signal characteristics of the LPCD signals. Therefore, by obtaining the signal characteristics of the LPCD signal, it is possible to determine whether the card reader device emitting the LPCD signal is a target-type device. Then, if the card reader device does not belong to the target type of device, generating an excitation signal can ensure that the emitted excitation signal can stimulate the card reader device to smoothly switch modes and achieve the expected goal.

[0039] In one embodiment, when an NFC tag detects a low-power card detection LPCD signal, it may first determine whether an induced signal exists in the NFC coil corresponding to the NFC tag, and generate an excitation signal if the induced signal does not exist. It can be understood that if a connection has already been established between the NFC tag and a card reader device and data interaction is occurring, the card reader device does not need to switch modes again, and the NFC tag does not need to send an excitation signal. Therefore, by determining whether an induced signal exists in the NFC coil corresponding to the NFC tag, it can be determined whether the NFC tag has established a connection with the card reader device. Sending an excitation signal when an induced signal does not exist in the NFC coil, i.e., when the NFC tag has not yet established a connection with the card reader device, can effectively optimize the power consumption of the NFC tag, and, for example, when the NFC tag is installed in a mobile device, can extend the operating time of the mobile device.

[0040] 3 is a flowchart of a card search method provided by one exemplary embodiment. As shown in FIG. 3, the method may be applied to a card reader device (for example, may be located on the mobile device 11 shown in FIG. 1) and may include the following steps:

[0041] S301: In the low power consumption card detection mode, a low power consumption card detection LPCD signal is generated.

[0042] S302: Switch from the low power consumption card detection mode to a normal card search mode when an excitation signal emitted by an NFC tag is received when the LPCD signal is detected.

[0043] In one embodiment, the card reader device has a plurality of different card search modes, and in the low-power card detection mode, the signal it emits is a low-power card detection LPCD signal. The card reader device may switch from the low-power card detection mode to the normal card search mode when it receives an excitation signal emitted when the LPCD signal is detected by an NFC tag. For related content, please refer to the related description in the NFC tag-side embodiment shown in Figure 1.

[0044] As can be seen from the above embodiments, by applying the technical solution of this specification, in the low power consumption mode, the card reader device can exit the low power consumption mode and perform normal card search in response to the excitation signal actively emitted by the NFC tag, which greatly improves the success rate of the mobile device detecting the NFC tag and improves the user experience.

[0045] FIG. 4 is a schematic diagram of an NFC tag according to one exemplary embodiment, which includes an NFC coil 41, an NFC tag chip 42, an analog-to-digital converter 43, and an excitation module 44.

[0046] In one embodiment, the NFC coil 41 is used to detect wireless signals within a predetermined detection range. The wireless signals may be various types of signals, including a low-power card detection LPCD signal emitted by the card reader device in a low-power card detection mode; for related content, see the method embodiment above. The NFC tag chip 42 is connected to the NFC coil 41 and used to store written tag data. Here, the NFC tag chip should be a slave device chip that can respond to signals emitted from a master device (card reader device) without actively emitting any signals or data. The analog-to-digital converter 43 is connected to the NFC coil 41 and used to convert the analog signal detected by the NFC coil into a digital signal. The specific methods of the NFC coil's detection of wireless signals, the NFC tag chip's storage of tag data, and the analog-to-digital converter's signal conversion can be found in the related art and will not be described again here.

[0047] In one embodiment, the excitation module 44 is respectively connected to the NFC coil 41 and the analog-to-digital converter 43, and is used to generate an excitation signal when the digital signal is determined to be an LPCD signal, and emit the excitation signal through the NFC coil 41 to switch the card reader device from the low-power card detection mode to the normal card search mode.

[0048] In one embodiment, the excitation module may be implemented in an NFC card reader chip. The NFC card reader chip is distinct from the NFC tag chip. As a master device chip, it can generate a radio frequency field, actively emit radio signals, and respond to signals. Implementing the excitation module in an NFC card reader chip does not require additional hardware development, significantly reducing implementation difficulty and development costs.

[0049] In another embodiment, the excitation module may be realized by constructing a hardware circuit. Specifically, referring to FIG. 5 , the excitation module includes a controller 51 and a signal generating circuit 52. The controller 51 is connected to the analog-to-digital converter 43 in FIG. 4 and is used to acquire and recognize the digital signal output by the analog-to-digital converter 43. If the digital signal is determined to be the LPCD signal, the controller 51 issues an excitation signal generation command. The excitation signal generation command instructs the signal generating circuit 52 to generate an excitation signal. The generation command may include excitation signal generation parameters, such as the duration and signal size of the excitation signal. The signal generating circuit 52 may generate an excitation signal that satisfies the conditions according to the generation parameters, thereby ensuring that the generated excitation signal can achieve the expected effect after being emitted. The signal generating circuit 52 is connected to the controller 51 and the NFC coil 41, respectively. If the controller 51 issues an excitation signal generation command, the signal generating circuit 52 generates an excitation signal and emits the excitation signal through the NFC coil 41. In this embodiment, another way of realizing the excitation module 44 is provided, which is realized by constructing additional hardware circuits, so that those skilled in the art can adjust detailed functions more easily without being limited by the already packaged NFC card reader chip, and have greater flexibility and adaptability.

[0050] In one embodiment, the controller 51 may further be used for determining signal characteristics of the LPCD signal, and, when it is determined according to the signal characteristics that the card reader device that emitted the LPCD signal does not belong to the target type device, issuing a command to generate the excitation signal to the signal generating circuit 52. In another embodiment, the controller 51 may further be used for determining whether an induced signal exists in the NFC coil 41 corresponding to the NFC tag, and, when the induced signal does not exist, issuing a command to generate the excitation signal to the signal generating circuit 52. For related contents, please refer to the related description in the embodiment on the NFC tag side shown in Figure 1.

[0051] Below, the overall flow of the technical solution of this specification will be explained by combining the card search sequence diagram shown in Figure 6 with the signal waveform diagrams shown in Figures 7(a), 7(b), and 7(c).

[0052] In the default state, the NFC tag is in its initial state, and the card reader device is in low-power card detection mode, continuously transmitting a low-power card detection LPCD signal. When the card reader device approaches an NFC tag, it should sense the presence of an NFC tag nearby and autonomously switch from low-power card detection mode to normal card search mode. As shown in Figure 7(a), the card reader device performed normal card search and card reading after the second LPCD cycle.

[0053] However, in the low-power card detection mode, the card reader device may not be able to correctly sense the presence of an NFC tag in the vicinity, so it continues to transmit the low-power card detection LPCD signal. As shown in Figure 7(b), the sensing is unsuccessful for several consecutive LPCD cycles.

[0054] In such a case, the NFC tag performs signal detection within a preset detection range by executing step 601. If the NFC tag detects an LPCD signal, it may subsequently perform step 602 to determine whether the condition for transmitting an excitation signal is met.

[0055] Specifically, step 602 includes step 6021 and step 6022. Step 6021 may be performed first to obtain the signal characteristics of the LPCD signal and determine whether the LPCD signal is a signal emitted from a device that does not belong to the target type. If it is determined that the LPCD signal is a signal emitted from a device that does not belong to the target type, step 6022 or step 603 may be performed. Of course, step 6022 may be performed first to determine whether an induced signal exists in the NFC coil corresponding to the NFC tag, and if the induced signal does not exist, step 6021 or step 603 may be performed.

[0056] It should be noted that step 602 and steps 6021 and 6022 included therein are all optional steps, and those skilled in the art can choose whether or not to perform these steps depending on the actual situation.

[0057] The NFC tag then performs step 603 to generate an excitation signal, and subsequently performs step 604 to emit the excitation signal. The excitation signal emitted from the NFC tag is received by the card reader device, which performs step 605 in response to the excitation signal to switch its low-power card detection mode to normal card search mode. As shown in FIG. 7(c), although the card reader device did not successfully sense the NFC tag in the first LPCD cycle, the NFC tag actively transmitted an excitation signal, and the card reader device then performed normal card search and card reading. When the card reader device performs card search in normal card search mode, the NFC tag accordingly emits a card search response. Upon receiving the card search response, the card reader device can establish a communication connection with the NFC tag and perform data interaction.

[0058] FIG. 8 is a schematic diagram of an electronic device according to one exemplary embodiment. Referring to FIG. 8, at the hardware level, the device includes a processor 802, an internal bus 804, a network interface 806, a memory 808, and a non-volatile memory 810, and may also include hardware necessary for other functions. One or more embodiments of the present specification may be implemented based on software, for example, by having the processor 802 read a corresponding computer program from the non-volatile memory 810 into the memory 808 and execute it. Of course, in addition to the software implementation, one or more embodiments of the present specification do not exclude other implementation methods, such as a logic device or a combination of software and hardware. That is, the execution entity of the following process flow is not limited to each logical unit, but may also be hardware or a logic device.

[0059] Referring to Fig. 9, to realize the technical solution of this specification, the device for assisting a card reader to realize card search may be applied to a device as shown in Fig. 8. Wherein, the device for assisting a card reader to realize card search may be applied to an NFC tag, and may include a signal detection unit 91, an excitation signal generation unit 92, and an excitation signal transmission unit 93, where: The signal detection unit 91 is used to perform signal detection within a preset detection range, the excitation signal generating unit 92 is used to generate an excitation signal when detecting a low-power card detection LPCD signal emitted by the card reader device in a low-power card detection mode; The excitation signal sending unit 93 is used to send the excitation signal to make the card reader device switch from the low power card detection mode to the normal card search mode.

[0060] Optionally, the excitation signal generation unit 92 specifically: obtaining a signal characteristic of the LPCD signal; generating the excitation signal when it is determined according to the signal characteristics that the card reader device that emitted the LPCD signal does not belong to a target-type device, wherein the target-type device may wake up a pre-deployed emulation NFC tag due to receiving the excitation signal in the low-power card detection mode.

[0061] Optionally, the signal characteristics of the LPCD signal include at least one of a signal interval period, a signal size, and a signal duration.

[0062] Optionally, the excitation signal generation unit 92 specifically: determining whether an induced signal is present in an NFC coil corresponding to the NFC tag; and generating the excitation signal when the inducing signal is not present.

[0063] Referring to FIG. 10, to realize the technical solution of this specification, the card search device may be applied to a device as shown in FIG.

[0064] Wherein, the card search device is applied to a card reader device, and may include a signal sending unit 101 and a mode switching unit 102, where: The signal sending unit 101 is used to emit a low-power card detection LPCD signal in a low-power card detection mode; The mode switching unit 102 is used to switch from the low power card detection mode to a normal card search mode when receiving an excitation signal emitted when the LPCD signal is detected by an NFC tag.

[0065] The apparatus embodiments basically correspond to the method embodiments, so please refer to the description of the method embodiments for relevant parts. The apparatus embodiments described above are merely schematic, and the modules described as separate components therein may or may not be physically separate, and the components shown as modules may or may not be physical modules, i.e., located in a single location or distributed across multiple network modules. Depending on actual needs, some or all of the modules may be selected to achieve the purpose of the solution of this embodiment. Those skilled in the art can understand and implement this without any creative effort.

[0066] Accordingly, the present specification further provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method according to any of the above embodiments.

[0067] Accordingly, the embodiments herein further propose a computer program product configured to perform the method according to any of the above embodiments.

[0068] The systems, devices, modules, or units described in the above embodiments may be specifically realized by computer chips or entities, or may be realized by products having certain functions. One typical realizing device is a computer, and the specific form of the computer may be a personal computer, a laptop computer, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email sending / receiving device, a game console, a tablet computer, a wearable device, or a combination of any two or more of these devices.

[0069] In one typical configuration, a computer includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0070] The memory may include any form of computer-readable medium, such as persistent memory, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

[0071] Computer-readable media include persistent and non-persistent, removable and non-removable media, and may be implemented by any method or technology for storing information. Information may be computer-readable instructions, data structures, program modules, or other data. Computer storage media may include, for example, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital multifunction disk (DVD) or other optical storage, cartridge magnetic tape, magnetic disk storage, quantum memory, graphene-based storage media or other magnetic storage, or any other non-transmission medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals or carriers.

[0072] Furthermore, the terms "comprise," "include," or any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus comprising a set of elements includes not only those elements but also other elements not expressly listed or inherent in such process, method, article, or apparatus. Unless further limited, an element defined by the phrase "comprises one of" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises said element.

[0073] The foregoing describes specific embodiments of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the examples and still achieve desirable results. Also, processes depicted in figures do not necessarily require a particular order or sequential order to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or advantageous.

[0074] The terms used in one or more examples herein are for the purpose of describing particular examples only and are not intended to limit the one or more examples herein. As used in one or more examples herein and in the appended claims, the singular forms "a," "the," "said," and "this" are also intended to include the plural forms unless the context clearly dictates otherwise. Furthermore, the term "and / or," as used herein, should be understood to mean and include any and all possible combinations of one or more associated listed items.

[0075] In one or more embodiments of the present specification, terms such as first, second, and third may be used to describe various pieces of information, but it should be understood that such information is not limited to these terms. These terms are used only to distinguish between pieces of information of the same type. For example, first information may be referred to as second information, and similarly, second information may be referred to as first information, without departing from the scope of one or more embodiments of the present specification. Depending on the context, for example, the word "if" used herein may be interpreted as "if," "when," or "in response to determining."

[0076] The above description is merely a preferred embodiment of one or more embodiments of the present specification, and is not intended to limit the one or more embodiments of the present specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of one or more embodiments of the present specification should be included within the protection scope of one or more embodiments of the present specification.

Claims

1. Applied to NFC tags, performing signal detection within a preset detection range; generating an excitation signal when detecting a low power card detect LPCD signal emitted by the card reader device in a low power card detect mode; sending the excitation signal to cause the card reader device to switch from a low power card detection mode to a normal card search mode; A method for assisting a card reader to realize card retrieval.

2. generating an excitation signal when a low power card detection (LPCD) signal is detected; obtaining signal characteristics of the LPCD signal; generating the excitation signal when it is determined according to the signal characteristics that the card reader device that emitted the LPCD signal does not belong to a target-type device, wherein the target-type device may wake up a pre-deployed emulation NFC tag due to receiving the excitation signal in the low-power card detection mode; The method of claim 1.

3. the signal characteristics of the LPCD signal include at least one of a signal interval period, a signal size, and a signal duration; The method of claim 2.

4. generating an excitation signal when a low power card detection (LPCD) signal is detected; determining whether an induced signal is present in an NFC coil corresponding to the NFC tag; generating the excitation signal when the induced signal is not present. The method of claim 1.

5. Applied to card reader devices, in a low power card detect mode, issuing a low power card detect LPCD signal; and switching from the low power card detection mode to a normal card search mode when receiving an excitation signal emitted by an NFC tag when the LPCD signal is detected. Card search method.

6. an NFC coil used to sense a radio signal within a predetermined detection range, the radio signal including a low power card detection LPCD signal emitted by a card reader device in a low power card detection mode; an NFC tag chip connected to the NFC coil, the NFC tag chip being used to store written tag data; an analog-to-digital converter connected to the NFC coil, the analog-to-digital converter being used to convert an analog signal sensed by the NFC coil into a digital signal; an excitation module respectively connected to the analog-to-digital converter and the NFC coil, the excitation module being used to generate an excitation signal and emit it through the NFC coil when the digital signal is determined to be the LPCD signal, thereby switching the card reader device from a low-power card detection mode to a normal card search mode; NFC tag.

7. the excitation module comprises an NFC card reader chip; The NFC tag according to claim 6 .

8. The excitation module includes: a controller connected to the analog-to-digital converter, the controller being used to acquire and recognize the digital signal and, if the digital signal is determined to be the LPCD signal, to issue a command to generate an excitation signal; a signal generation circuit connected to the controller and the NFC coil, respectively, the signal generation circuit being used to generate the excitation signal and emit the excitation signal through the NFC coil when the generation command is received; The NFC tag according to claim 6 .

9. The controller further comprises: determining a signal characteristic of the LPCD signal; issuing a command to generate the excitation signal when it is determined according to the signal characteristics that the card reader device that emitted the LPCD signal does not belong to a target-type device, wherein the target-type device may wake up a pre-deployed emulation NFC tag due to receiving the excitation signal in the low-power card detection mode; The NFC tag according to claim 8.

10. The controller further comprises: determining whether an induced signal is present in an NFC coil corresponding to the NFC tag; and issuing a command to generate the excitation signal when the induction signal is not present. The NFC tag according to claim 8.

11. a processor; a memory adapted to store processor executable instructions; The processor executes the executable instructions to implement the method of any one of claims 1 to 5. electronic equipment.

12. A computer readable storage medium having stored thereon computer instructions, said instructions, when executed by a processor, implementing the steps of the method of any one of claims 1 to 5. A computer-readable storage medium.

13. A computer program product comprising computer programs / instructions which, when executed by a processor, implement the method according to any one of claims 1 to 5. Computer program products.

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