Method for assisting card reader to realize card searching, card searching method and NFC (Near Field Communication) tag

Abstract

One or more embodiments of the invention provide a method for assisting a card reader to realize card searching, a card searching method and an NFC tag. The method comprises the following steps: performing signal detection in a preset detection range; under the condition that the low power consumption card detection LPCD signal is detected, an excitation signal is generated, and the LPCD signal is sent out by the card reader equipment in the low power consumption card detection mode; and sending the excitation signal, so that the card reader equipment is switched from a low-power-consumption card detection mode to a normal card searching mode.

Description

Technical Field

[0001] One or more embodiments of the present specification relate to the field of wireless communications, and more particularly to a method for assisting a card reader in finding a card, a card finding method, and an NFC tag. Background Art

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

[0003] In the related art, mobile devices such as mobile phones can be used as NFC devices with card reader functions to read information in NFC tags, but considering the battery life of mobile devices, LPCD (Low Power Card Detection) mode is usually used. When the mobile device is close to the NFC tag, it switches to the normal card search mode.

[0004] However, the sensing distance and sensing sensitivity of the mobile device to the NFC tag in the LPCD mode are reduced, resulting in the mobile device being unable to switch to the normal card-finding mode, thereby significantly reducing the success rate of the mobile device sensing the NFC tag, affecting the user experience. Summary of the invention

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

[0006] To achieve the above objectives, one or more embodiments of this specification provide the following technical solutions:

[0007] According to a first aspect of one or more embodiments of this specification, a method for assisting a card reader in realizing card search is proposed, which is applied to an NFC tag and includes:

[0008] Perform signal detection within a preset detection range;

[0009] generating an excitation signal in the case of detecting a low power card detection LPCD signal, wherein the LPCD signal is sent by the card reader device in a low power card detection mode;

[0010] The excitation signal is sent to switch the card reader device from a low-power card detection mode to a normal card search mode.

[0011] According to a second aspect of one or more embodiments of this specification, a card searching method is provided, which is applied to a card reader device, comprising:

[0012] In low power card detection mode, a low power card detection LPCD signal is sent;

[0013] When an excitation signal is received, the low-power card detection mode is switched to a normal card search mode. The excitation signal is sent by the NFC tag when the LPCD signal is detected.

[0014] According to a third aspect of one or more embodiments of this specification, an NFC tag is provided, including:

[0015] An NFC coil is used to sense a wireless signal within a preset detection range, wherein the wireless signal includes a low power card detection (LPCD) signal, and the LPCD signal is sent by a card reader device in a low power card detection mode;

[0016] An NFC tag chip, connected to the NFC coil, and used to store written tag data;

[0017] The excitation module is connected to the NFC coil and is used to generate an excitation signal and send it through the NFC coil when it is determined that the NFC coil senses the LPCD signal, so as to switch the card reader device from the low-power card detection mode to the normal card search mode.

[0018] According to a fourth aspect of one or more embodiments of the present specification, an electronic device is proposed, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in the first or second aspect above when executing the computer program.

[0019] According to a fifth aspect of one or more embodiments of this specification, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the first aspect or the second aspect are implemented.

[0020] According to a sixth aspect of one or more embodiments of this specification, a computer program product is proposed, including a computer program / instruction, which implements the method described in the first aspect or the second aspect when executed by a processor.

[0021] In the technical solution provided in this specification, the NFC tag can detect signals within a preset detection range, and when detecting the LPCD signal emitted by the card reader device in the low-power card detection mode, 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 of this specification, the NFC tag can detect the LPCD signal by itself and actively send an excitation signal to ensure that the card reader device can exit the low-power mode to search for cards normally, which greatly improves the success rate of mobile devices sensing NFC tags and also improves the user experience.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the embodiments of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the architecture of a near field communication system provided by an exemplary embodiment.

[0024] Figure 2 The present invention is a flowchart of a method for assisting a card reader to realize card search, provided by an exemplary embodiment.

[0025] Figure 3 It is a flow chart of a card searching method provided by an exemplary embodiment.

[0026] Figure 4 This is a schematic diagram of an NFC tag structure provided by an exemplary embodiment.

[0027] Figure 5 It is a schematic block diagram of an excitation module structure provided by an exemplary embodiment.

[0028] Figure 6 It is a timing diagram of a card searching process provided by an exemplary embodiment.

[0029] FIG. 7( a ) is a schematic diagram of a signal waveform when searching for a card provided by an exemplary embodiment.

[0030] FIG. 7( b ) is a schematic diagram of a signal waveform when searching for a card provided by an exemplary embodiment.

[0031] FIG. 7( c ) is a schematic diagram of a signal waveform when searching for a card provided by an exemplary embodiment.

[0032] Figure 8 It is a structural schematic diagram of a device provided by an exemplary embodiment.

[0033] Fig. 9 It is a block diagram of a device for assisting a card reader in realizing card search, provided by an exemplary embodiment.

[0034] Fig.10 It is a block diagram of a card-finding device provided by an exemplary embodiment. DETAILED DESCRIPTION

[0035] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with one or more embodiments of this specification. Instead, they are merely examples of devices and methods consistent with some aspects of one or more embodiments of this specification as detailed in the appended claims.

[0036] It should be noted that: in other embodiments, the steps of the corresponding method are not necessarily performed in the order shown and described in this specification. In some other embodiments, the steps included in the method may be more or less than those described in this specification. In addition, a single step described in this specification may be decomposed into multiple steps for description in other embodiments; and multiple steps described in this specification may be combined into a single step for description in other embodiments.

[0037] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this manual are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0038] NFC (Near Field Communication) is a short-range wireless communication technology that can realize near-field communication between two NFC devices, and can also allow NFC devices to interact with NFC tags to achieve data transmission, writing and reading, etc. Here, the NFC device should be an active device with a card reader function, that is, an NFC card reader, while the NFC tag is a passive device that does not actively send any signals and data and needs to receive stimulation from the active device to work. Therefore, NFC has two communication modes: active mode and passive mode. The active mode should correspond to the interaction between two NFC devices. Both the initiating device and the target device are NFC devices. When sending data to each other, both the initiating device and the target device must actively generate a radio frequency field; while the passive mode should correspond to the interaction between the NFC device and the NFC tag. The NFC device (NFC card reader) is the initiating device, also called the master device. The master device uses the energy provided by other power supply devices to provide a radio frequency field and sends signal data to the NFC tag as the target device, also called the slave device. The slave device passively responds to the signal sent by the master device without generating a radio frequency field.

[0039] In the related art, mobile devices with NFC card reader functions, such as mobile phones, can be used as NFC devices in the above-mentioned passive mode. When they are close to other NFC tags, a 13.56MHz radio frequency field will be established between the two as a near-field communication field, and data transmission and exchange will be achieved through this communication field. However, due to the battery life issues faced by mobile devices, device manufacturers of mobile phones and other mobile devices will set low-power usage goals for the NFC function, and accordingly make a series of low-power restrictions and optimizations on the NFC reader function, such as using the LPCD (Low Power Card Detection) mode. In the LPCD mode, the mobile device will turn off the radio frequency field when there are no NFC tags around, and only send low-power detection signals to reduce energy consumption; when the mobile device is close to the NFC tag, it can detect the impact of the NFC tag on the detection signal, and then exit the LPCD mode to search for NFC tags in normal mode.

[0040] However, currently, when mobile devices use the LPCD mode to sense NFC tags, they usually cannot achieve the desired effect. Since the signal strength emitted by the mobile device in the LPCD mode is weak, the influence of the NFC tag on the signal will also be reduced accordingly, making it impossible for the mobile device to determine whether there is an NFC tag around by the change in the signal amplitude, which in turn causes the mobile device to be unable to obtain the correct judgment result and unable to switch to the normal card search mode, which in turn significantly reduces the success rate of the mobile device sensing the NFC tag, affecting the user experience.

[0041] In order to solve the above problems, this specification proposes a method for assisting a card reader in achieving card search and an NFC tag. The NFC tag can detect signals within a preset detection range, and upon detecting an LPCD signal emitted by the card reader device in a low-power card detection mode, 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.

[0042] Figure 1 FIG. 1 is a schematic diagram of the architecture of a near field communication system provided by an exemplary embodiment. Figure 1 As shown, the system may include a mobile device 11 and several devices equipped with NFC tags, such as device 12, device 13, etc.

[0043] The mobile device 11 should be a type of electronic device with NFC card reader function that can be used by the user, such as a mobile phone. In fact, the user can obviously also use electronic devices such as the following types: tablet devices, laptops, PDAs (Personal Digital Assistants), wearable devices (such as smart glasses, smart watches, etc.), etc., and one or more embodiments of this specification do not limit this. During operation, the mobile device can run a program of an application to implement the NFC-related functions of the application. For example, when the mobile device runs a payment service application, it can sense the payment data in the NFC tag to jump to the payment page so that the user can complete the quick payment.

[0044] It should be noted that the payment service application program can be pre-installed on the mobile device so that the application can be started and run on the mobile device; of course, when an online application such as HTML5 technology is adopted, the application can be obtained and run without installing the corresponding program on the mobile device.

[0045] The mobile device 11 and the devices 12-13 equipped with NFC tags can communicate and transmit data between the devices through electromagnetic waves. The devices 12-13 can be any devices equipped with NFC tags, such as payment terminal devices, payment code cards, electronic door locks, and entry and exit gates. Of course, in the case where the mobile device is equipped with an NFC tag, the devices 12-13 can also be the above-mentioned mobile devices, and this specification does not limit this.

[0046] Figure 2 FIG. 1 is a flowchart of a method for assisting a card reader in realizing card search, provided by an exemplary embodiment. Figure 2 As shown, the method can be applied to NFC tags (for example, can be deployed in Figure 1 The device 12-13 shown in FIG. 1 may include the following steps:

[0047] S201, performing signal detection within a preset detection range.

[0048] In one embodiment, the NFC tag should detect all signals within a preset detection range, and the detected signals may include LPCD signals. The preset detection range should be the maximum range that the detection function of the NFC tag can cover, and the specific value depends on many factors, including the power of the signal transceiver, antenna gain, environmental conditions, etc.

[0049] S202, generating an excitation signal when a low power consumption card detection LPCD signal is detected, wherein the LPCD signal is sent by the card reader device in a low power consumption card detection mode.

[0050] In one embodiment, a low-power card detection LPCD signal is emitted by a card reader device in a low-power card detection mode to sense whether there is an NFC tag around it. Since each signal has its corresponding characteristics, such as different duration and amplitude change trends, the NFC tag can determine whether there is an LPCD signal emitted by the card reader device within a preset detection range, and generate an excitation signal when it is determined that there is an LPCD signal. The parameters required for generating the excitation signal can be set by a technician according to actual conditions, and can usually be set to a signal in a frequency band near 13.56Mhz, such as a signal between 12 and 15Mhz, and this manual does not limit this.

[0051] S203: Send the excitation signal to switch the card reader device from the low-power card detection mode to the normal card search mode.

[0052] In one embodiment, the NFC tag sends out the excitation signal generated in the aforementioned embodiment, which can stimulate 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 the excitation signal, it can also analyze the signal characteristics of the signal to determine whether it is necessary 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 will send out an activation signal to the NFC tag in the hope of getting a response from the NFC tag. The response of the NFC tag can be considered as a successful activation, after which data can be exchanged between the card reader and the NFC tag.

[0053] It should be noted that the timing of sending the excitation signal does not need to be coordinated with the sending cycle of the LPCD signal. The card reader device can receive the excitation signal at any time to achieve mode switching. The NFC tag can generate and send the excitation signal immediately without any special delay after detecting the LPCD signal. Of course, the technician can also set the sending timing according to actual needs, and this manual does not limit this.

[0054] It can be seen from the above embodiments that by applying the technical solution of this specification, the NFC tag can detect the LPCD signal by itself and actively send an excitation signal to ensure that the card reader device can exit the low power mode and perform normal card search, which greatly improves the success rate of mobile devices sensing NFC tags and also improves the user experience.

[0055] In one embodiment, in order to ensure that the initiated excitation signal can achieve the expected goal, that is, the excitation signal can stimulate the card reader device to smoothly switch modes, the NFC tag can further determine whether the LPCD signal meets the conditions requiring the NFC tag to send an excitation signal when detecting a low power card detection LPCD signal.

[0056] Specifically, the NFC tag can obtain the signal characteristics of the LPCD signal. Here, similar to the aforementioned characteristics of each signal, the LPCD signals sent by different card reader devices are also different. The signal characteristics may specifically include the signal interval period, signal size, and signal duration, etc. For example, in the case of different signal intervals, device A may send out an LPCD signal every 200 milliseconds, while device B may send out an LPCD signal every 800 milliseconds; in the case of different signal sizes, the amplitude of the LPCD signal sent by device A may be -20dBm, while the amplitude of the LPCD signal sent by device B may be -30dBm; in the case of different signal sending strategies, the difference lies in whether the device performs a normal power card search after sending several LPCD signals, such as device A will only send out LPCD signals in LPCD mode, while device B may send out an activation signal with normal power after sending out 4 LPCD signals, and then send out 4 LPCD signals, and so on. It should be noted that when an NFC tag acquires signal characteristics, it can acquire all possible combinations of the above-mentioned one characteristic or multiple characteristics, and this specification does not limit the types and quantities of the acquired signal characteristics.

[0057] For this embodiment, the card reader device can be divided into two categories: the first type of card reader device can smoothly switch from LPCD mode to normal card search mode when receiving the excitation signal; the second type of card reader device may be awakened by the excitation signal when receiving the excitation signal. The simulated NFC tag preset in the card reader device, such as some types of mobile phones will respond to the excitation signal to awaken the NFC transportation card, NFC access card, etc. in the mobile phone, and the mode cannot be switched. In this embodiment, the second type of device is used as a target type of device, that is, the target type of device is in the low-power card detection mode, and there is a risk of awakening the preset simulated NFC tag due to receiving the excitation signal. Since there are differences in the LPCD signals emitted by different card reader devices, and the differences can be reflected by the signal characteristics of the LPCD signal, therefore, when the signal characteristics of the LPCD signal are obtained, it can be determined whether the card reader device that emits the LPCD signal is a target type of device. Afterwards, if the card reader device does not belong to the target type of device, the excitation signal is generated again, which can ensure that the initiated excitation signal can stimulate the card reader device to smoothly switch modes and achieve the expected goal.

[0058] In one embodiment, when the NFC tag detects the low power card detection LPCD signal, it can also first determine whether there is an induction signal in the NFC coil corresponding to the NFC tag, and then generate an excitation signal when there is no induction signal. It can be understood that when a connection has been established between the NFC tag and the card reader device and data is exchanged, the card reader device does not need to switch modes again, and the NFC tag does not need to send an excitation signal. Therefore, it is possible to determine whether the NFC tag has established a connection with the card reader device by determining whether there is an induction signal in the NFC coil corresponding to the NFC tag. When there is no induction signal in the NFC coil, that is, when the NFC tag has not established a connection with the card reader device, sending an excitation signal can effectively optimize the power consumption of the NFC tag. For example, when the NFC tag is equipped with a mobile device, the battery life of the mobile device can be extended.

[0059] Figure 3 FIG. 1 is a flow chart of a card searching method provided by an exemplary embodiment. Figure 3 As shown, the method can be applied to a card reader device (for example, it can be deployed in Figure 1 On the mobile device 11 shown), the following steps may be included:

[0060] S301, in the low power card detection mode, sending a low power card detection LPCD signal;

[0061] S302, switching from the low-power card detection mode to the normal card search mode when receiving an excitation signal, wherein the excitation signal is sent by the NFC tag when detecting the LPCD signal.

[0062] In one embodiment, the card reader device has multiple different card search modes. In the low power card detection mode, the signal it sends is a low power card detection LPCD signal. When the card reader device receives an excitation signal sent by the NFC tag when the LPCD signal is detected, it can switch from the low power card detection mode to the normal card search mode. For related content, please refer to Figure 1 Related description in the NFC tag side embodiment shown.

[0063] It can be seen from the above embodiments that, by applying the technical solution of this specification, the card reader device can respond to the excitation signal actively sent by the NFC tag when it is in low-power mode, exit the low-power mode and perform normal card search, which greatly improves the success rate of mobile devices sensing NFC tags and enhances the user experience.

[0064] Figure 4 It is a schematic diagram of an NFC tag structure provided by an exemplary embodiment, including an NFC coil 41, an NFC tag chip 42, an analog-to-digital converter 43, and an excitation module 44.

[0065] In one embodiment, the NFC coil 41 is used to sense wireless signals within a preset detection range. The wireless signal may be a variety of types of signals, including a low-power card detection LPCD signal, which is emitted by the card reader device in a low-power card detection mode. For related content, please refer to the aforementioned method embodiment. The NFC tag chip 42 is connected to the NFC coil 41 and is used to store the written tag data. Here, the NFC tag chip should be a slave device chip that can respond to the signal emitted by the master device (card reader device) without actively emitting any signal and data. The analog-to-digital converter 43 is connected to the NFC coil 41 and is used to convert the analog signal sensed by the NFC coil into a digital signal. The specific methods of the NFC coil sensing wireless signals, the NFC tag chip storing tag data, and the analog-to-digital converter performing signal conversion can be referred to the records in the relevant technology, and this specification will not repeat them.

[0066] In one embodiment, the excitation module 44 is connected to the NFC coil 41 and the analog-to-digital converter 43, respectively, and is used to generate an excitation signal when it is determined that the digital signal is an LPCD signal, and send 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.

[0067] In one embodiment, the excitation module can be implemented using an NFC card reader chip. The NFC card reader chip is different from the above-mentioned NFC tag chip. As a main device chip, it can generate a radio frequency field and actively send out wireless signals, not just respond to signals. Using an NFC card reader chip to implement the excitation module does not require additional hardware development, greatly reducing the difficulty of implementation and the development cost.

[0068] In another embodiment, the excitation module can be implemented by building a hardware circuit. Figure 5 The excitation module includes a controller 51 and a signal generating circuit 52. The controller 51 and Figure 4 The analog-to-digital converter 43 in the NFC coil 41 is connected to obtain and identify the digital signal output by the analog-to-digital converter 43, and when it is determined that the digital signal is the LPCD signal, an instruction to generate an excitation signal is issued. The instruction to generate the excitation signal is used to instruct the signal generation circuit 52 to generate an excitation signal. The generation instruction may include generation parameters of the excitation signal, such as the duration of the excitation signal, the signal size, etc. The signal generation circuit 52 can generate a qualified excitation signal according to these generation parameters to ensure that the generated excitation signal can achieve the expected effect after being issued. The signal generation circuit 52 is respectively connected to the controller 51 and the NFC coil 41, and is used to generate an excitation signal when receiving the instruction to generate the excitation signal issued by the controller 51, and issue the excitation signal through the NFC coil 41. In this embodiment, another way to implement the excitation module 44 is provided. Since it is implemented by building an additional hardware circuit, technicians can more conveniently adjust the detailed functions without being limited to the packaged NFC reader chip, which has higher flexibility and adaptability.

[0069] In one embodiment, the controller 51 may also be used to determine the signal characteristics of the LPCD signal, and when it is determined according to the signal characteristics that the card reader device that sends the LPCD signal does not belong to the target type of device, the controller 51 may issue a generation instruction of the excitation signal to the signal generation circuit 52. In another embodiment, the controller 51 may also be used to determine whether there is an induction signal in the NFC coil 41 corresponding to the NFC tag, and when there is no induction signal, the controller 51 may issue a generation instruction of the excitation signal to the signal generation circuit 52. For related content, please refer to Figure 1 Related description in the NFC tag side embodiment shown.

[0070] The following will be combined Figure 6 The card-searching timing diagram shown and the signal waveform diagrams shown in FIG. 7( a ), FIG. 7 ( b ), and FIG. 7 ( c ) provide an overall description of the process of the technical solution of this specification.

[0071] In the default state, the NFC tag is in the initial state, and the card reader device is in the low-power card detection mode, and will continue to send low-power card detection LPCD signals. At this time, if the card reader device is close to the NFC tag, the card reader device should sense the presence of NFC tags around it, and thus automatically switch from the low-power card detection mode to the normal card search mode. As shown in Figure 7(a), the card reader device performs normal card search and card reading after the second LPCD cycle.

[0072] However, in the low-power card detection mode, the card reader device may not be able to correctly sense the presence of the NFC tag around it, so it will continue to send the low-power card detection LPCD signal. As shown in Figure 7(b), there is no successful sensing in multiple consecutive LPCD cycles.

[0073] In this case, the NFC tag executes step 601 to detect signals within a preset detection range; when the NFC tag detects the LPCD signal, step 602 may be continued to determine whether the conditions for sending the excitation signal are met.

[0074] 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 by a device that does not belong to the target type. In the case where it is determined that the LPCD signal is a signal emitted by a device that does not belong to the target type, step 6022 or step 603 may be performed; of course, step 6022 may also be performed first to determine whether there is an induction signal in the NFC coil corresponding to the NFC tag, and in the absence of the induction signal, step 6021 or step 603 may be performed.

[0075] It should be noted that step 602 and steps 6021 and 6022 included therein are all optional steps, and the technician can choose whether to execute these steps according to the actual situation.

[0076] After that, the NFC tag executes step 603 to generate an excitation signal, and continues to execute step 604 to send the excitation signal. The excitation signal sent by the NFC tag will be received by the card reader device, and in response to the excitation signal, step 605 will be executed to switch its own low-power card detection mode to the normal card search mode. As shown in Figure 7(c), the card reader device failed to sense successfully in the first LPCD cycle, and the NFC tag actively sent an excitation signal, after which the card reader device performed normal card search and card reading. When the card reader device searches for a card in the normal card search mode, the NFC tag will correspondingly send a card search response, and after receiving the card search response, the card reader device can establish a communication connection with the NFC tag to exchange data.

[0077] Figure 8is a schematic structural diagram of an electronic device provided by an exemplary embodiment. Figure 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 required for other functions. One or more embodiments of this specification may be implemented based on software, such as the processor 802 reading the corresponding computer program from the non-volatile memory 810 into the memory 808 and then running it. Of course, in addition to the software implementation, one or more embodiments of this specification do not exclude other implementations, such as logic devices or a combination of software and hardware, etc., that is, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic devices.

[0078] refer to Fig. 9 , the device for assisting the card reader to find the card can be applied to Figure 8 The device shown in the figure is used to implement the technical solution of this specification. The device for assisting the card reader to find the card is applied to the NFC tag and may include a signal detection unit 91, an excitation signal generation unit 92 and an excitation signal sending unit 93, wherein:

[0079] A signal detection unit 91, used to detect signals within a preset detection range;

[0080] An excitation signal generating unit 92 is used to generate an excitation signal when a low power consumption card detection LPCD signal is detected, wherein the LPCD signal is sent by the card reader device in a low power consumption card detection mode;

[0081] The excitation signal sending unit 93 is used to send the excitation signal to switch the card reader device from the low-power card detection mode to the normal card search mode.

[0082] Optionally, the excitation signal generating unit 92 is specifically used for:

[0083] Acquiring signal characteristics of the LPCD signal;

[0084] When it is determined according to the signal characteristics that the card reader device that sends the LPCD signal does not belong to the target type of device, the excitation signal is generated; wherein, when the target type of device is in the low-power card detection mode, there is a risk of awakening a preset simulated NFC tag due to receiving the excitation signal.

[0085] Optionally, the signal characteristics of the LPCD signal include at least one of the following: signal interval period, signal size, and signal duration.

[0086] Optionally, the excitation signal generating unit 92 is specifically used for:

[0087] Determine whether there is an induction signal in the NFC coil corresponding to the NFC tag;

[0088] In the absence of the induction signal, the excitation signal is generated.

[0089] refer to Fig.10 The card-finding device can be applied to Figure 8 The device shown in the figure is used to implement the technical solution of this specification. 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, wherein:

[0090] The signal sending unit 101 is used to send a low power card detection LPCD signal in a low power card detection mode;

[0091] The mode switching unit 102 is used to switch from the low power consumption card detection mode to the normal card search mode when receiving an excitation signal, wherein the excitation signal is sent by the NFC tag when detecting the LPCD signal.

[0092] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts refer to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0093] Accordingly, the present specification also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method described in any of the above embodiments is implemented.

[0094] Accordingly, an embodiment of this specification also proposes a computer program product, which is configured to execute the method described in any of the above embodiments.

[0095] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer, which may be in the form of a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email transceiver, a game console, a tablet computer, a wearable device or a combination of any of these devices.

[0096] In a typical configuration, a computer includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0097] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0098] Computer-readable media include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, 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 versatile disc (DVD) or other optical storage, magnetic cassettes, disk storage, quantum memory, graphene-based storage media or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0099] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0100] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0101] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms of "a", "said" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0102] It should be understood that although the terms first, second, third, etc. may be used to describe various information in one or more embodiments of this specification, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0103] The above description is merely a preferred embodiment of one or more embodiments of the present specification and is not intended to limit one or more embodiments of the present specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present specification shall be included in the scope of protection of one or more embodiments of the present specification.

Claims

1. A method for assisting a card reader to find a card, characterized in that: Applied to NFC tags, including: Perform signal detection within a preset detection range; generating an excitation signal in the case of detecting a low power card detection LPCD signal, wherein the LPCD signal is sent by the card reader device in a low power card detection mode; The excitation signal is sent so that the card reader device switches from the low-power card detection mode to the normal card search mode when the card reader device determines that the signal received by the card reader device is the excitation signal based on the signal characteristics of the signal.

2. The method according to claim 1, characterized in that The step of generating an excitation signal when a low power consumption card detection LPCD signal is detected includes: Acquiring signal characteristics of the LPCD signal; When it is determined according to the signal characteristics that the card reader device that sends the LPCD signal does not belong to the target type of device, the excitation signal is generated; wherein, when the target type of device is in the low-power card detection mode, there is a risk of awakening a preset simulated NFC tag due to receiving the excitation signal.

3. The method according to claim 2, characterized in that The signal characteristics of the LPCD signal include at least one of the following: signal interval period, signal size, and signal duration.

4. The method according to claim 1, characterized in that: The step of generating an excitation signal when a low power consumption card detection LPCD signal is detected includes: Determine whether there is an induction signal in the NFC coil corresponding to the NFC tag; In the absence of the induction signal, the excitation signal is generated.

5. A card searching method, characterized in that: Applicable to card reader devices, including: In low power card detection mode, a low power card detection LPCD signal is sent; When an excitation signal is received, the low-power card detection mode is switched to the normal card search mode when the signal is determined to be the excitation signal based on the signal characteristics of the received signal. The excitation signal is sent by the NFC tag when the LPCD signal is detected.

6. An NFC tag, characterized in that: include: An NFC coil is used to sense a wireless signal within a preset detection range, wherein the wireless signal includes a low power card detection (LPCD) signal, and the LPCD signal is sent 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; an analog-to-digital converter, connected to the NFC coil, and configured to convert an analog signal sensed by the NFC coil into a digital signal; The excitation module is connected to the analog-to-digital converter and the NFC coil respectively, and is used to generate an excitation signal and send it through the NFC coil when it is determined that the digital signal is the LPCD signal, so that the card reader device switches from the low-power card detection mode to the normal card search mode when it determines that the signal is the excitation signal based on the signal characteristics of the signal received by itself.

7. The NFC tag according to claim 6, characterized in that: The excitation module includes: an NFC card reader chip.

8. The NFC tag according to claim 6, characterized in that: The incentive module also includes: a controller, connected to the analog-to-digital converter, configured to acquire and identify the digital signal, and issue a generation instruction of an excitation signal when determining that the digital signal is the LPCD signal; The signal generating circuit is connected to the controller and the NFC coil respectively, and is used to generate the excitation signal when receiving the generating instruction, and send the excitation signal through the NFC coil.

9. The NFC tag according to claim 8, characterized in that: The controller is also used for: determining a signal characteristic of the LPCD signal; When it is determined according to the signal characteristics that the card reader device that sends the LPCD signal does not belong to the target type of device, an instruction to generate the excitation signal is issued; wherein, when the target type of device is in the low-power card detection mode, there is a risk of awakening a preset simulated NFC tag due to receiving the excitation signal.

10. The NFC tag according to claim 8, characterized in that: The controller is also used for: Determine whether there is an induction signal in the NFC coil corresponding to the NFC tag; In the absence of the induction signal, an instruction to generate the excitation signal is issued.

11. An electronic device, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor implements the method according to any one of claims 1 to 5 by running the executable instructions.

12. A computer-readable storage medium having computer instructions stored thereon, characterized in that: When the instruction is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

13. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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