CN117879654A - Near field communication method, device and system - Google Patents
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- CN117879654A CN117879654A CN202410057052.6A CN202410057052A CN117879654A CN 117879654 A CN117879654 A CN 117879654A CN 202410057052 A CN202410057052 A CN 202410057052A CN 117879654 A CN117879654 A CN 117879654A
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Abstract
The embodiment of the application provides a near field communication method, a near field communication device and a near field communication system, wherein the near field communication method comprises the following steps: executing low-power card detection until at least one near field communication device is detected or the low-power card detection reaches a preset condition, and executing full-power polling; and the reader employs different transmit powers for different NFC technologies to perform the full power polling. The near field communication method provided by the application can effectively improve the communication performance problem of near field communication equipment, so that the card reading distance of a card reader to cards of different NFC technologies is maximized.
Description
Technical Field
The present disclosure relates to a near field communication method, apparatus, and system, and more particularly, to a near field communication method, apparatus, and system for enhancing communication performance between near field communication devices.
Background
Near field communication (NFC, near Field Communication) relies on a magnetic field coupled between two NFC devices to communicate, for example, between a common card reader and a passive card, the card reader emits a magnetic field at a certain emission power, the antenna of the passive card induces a voltage from the magnetic field, and when the induced voltage is sufficiently large, the passive card is activated (i.e. can work normally), thereby receiving a command emitted by the card reader and replying a signal to the card reader through load modulation.
NFC devices may communicate with each other using various communication technologies, which are implemented by different coding and/or modulation schemes, and performing NFC polling operations may be used to find nearby NFC paired devices, where the near field communication method in the prior art combines low power card detection and full power polling, so as to save the power consumed by full power polling.
On this basis, how to enhance the communication performance of the near field communication device is an important research in the art.
Disclosure of Invention
The application provides a near field communication method which can effectively solve the problem of improving the communication performance of the existing near field communication equipment.
In a first aspect, a near field communication method is provided, including:
performing low-power card detection until at least one near field communication device is detected or the low-power card detection is performed to reach a preset condition; performing full power polling; the method is characterized in that: the reader employs different transmit powers for different NFC technologies to perform the full power polling.
In some possible implementations, the preset condition includes:
the times of executing the low-power card detection reach the times of detecting the low-power card n;
alternatively, the duration of performing the low power card detection reaches a preset duration.
In some possible implementations, the NFC technology includes: at least one of NFC-A, NFC-B, NFC-F or NFC-V.
In some possible implementations, the transmission voltages corresponding to different NFC technologies are respectively configured in a register or a memory, so that the card reader adopts different transmission powers for different NFC technologies to perform the full-power polling.
In some possible implementations, where the NFC technology that performs full power polling includes one of NFC-A, NFC-B, NFC-F and NFC-V:
and acquiring a transmitting voltage corresponding to the NFC technology through a card reader so as to generate a transmitting field, wherein the transmitting field comprises a card polling command, and the card polling command is used for acquiring a reply signal of a target card.
In some possible implementations, where the NFC technology that performs full power polling includes any two of NFC-A, NFC-B, NFC-F and NFC-V:
acquiring a first transmitting voltage corresponding to a first NFC technology through a card reader, so as to transmit a first transmitting field with first power; if the reply signal responding to the first transmitting field is not received; acquiring a second transmitting voltage corresponding to a second NFC technology through a card reader so as to transmit a second transmitting field with second power; wherein the first power is different from the second power.
In some possible implementations, where the NFC technology that performs full power polling includes any three of NFC-A, NFC-B, NFC-F and NFC-V:
acquiring a first transmitting voltage corresponding to a first NFC technology through a card reader, so as to transmit a first transmitting field with first power; if the reply signal responding to the first transmitting field is not received; acquiring a second transmitting voltage corresponding to a second NFC technology through a card reader so as to transmit a second transmitting field with second power; if a reply signal responding to the second transmitting field is not received; acquiring a third transmitting voltage corresponding to a third NFC technology through a card reader, so as to transmit a third transmitting field with third power;
wherein at least two of the first power, the second power, and the third power are different.
In some possible implementations, where the NFC technology that performs full power polling includes four of NFC-A, NFC-B, NFC-F and NFC-V:
acquiring a first transmitting voltage corresponding to a first NFC technology through a card reader, so as to transmit a first transmitting field with first power; if the reply signal responding to the first transmitting field is not received;
acquiring a second transmitting voltage corresponding to a second NFC technology through a card reader so as to transmit a second transmitting field with second power; if a reply signal responding to the second transmitting field is not received; acquiring a third transmitting voltage corresponding to a third NFC technology through a card reader, so as to transmit a third transmitting field with third power; if a reply signal responding to the third transmitting field is not received; acquiring a fourth transmitting voltage corresponding to a fourth NFC technology through a card reader, so as to transmit a fourth transmitting field with fourth power;
wherein at least two of the first power, the second power, the third power, and the fourth power are different.
In some possible implementations, the transmit power corresponding to the NFC-B technology is greater than the transmit power corresponding to the NFC-F technology and the NFC-V technology, and the transmit power corresponding to the NFC-se:Sub>A technology is less than the transmit power corresponding to the NFC-F technology and the NFC-V technology, so as to maximize the card reading distance of the card reader for cards of different NFC technologies.
In some possible implementations, the performing low power card detection includes: the transmit power is the same for each low power card detection.
In some possible implementations, the performing low power card detection includes: the transmit power for performing each low power card detection is different.
In a second aspect, there is provided a near field communication device comprising: near field communication controller for performing the near field communication method of claims 1-11.
In a third aspect, a near field communication system is provided, comprising: card reader and card, the card reader performing a near field communication interaction procedure with the card based on the near field communication method of claims 1-11.
Compared with the prior art, the beneficial effects of the embodiment of the application are that: the card reader transmits the polling command by adopting different powers aiming at different NFC technologies, and the different transmitting powers of the radio frequency field give consideration to the communication distance of the card reader for reading different cards, so that the requirement of the connection distance between near field communication devices is met, the communication performance of the near field communication devices is improved, the card reading success rate is improved, and the user experience is improved.
Drawings
Fig. 1 is a schematic diagram of a near field communication method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a polling operation in the related art;
fig. 3a is a schematic diagram of four NFC technology polling operations according to an embodiment of the present application;
fig. 3b is a schematic diagram two of four NFC technology polling operations according to an embodiment of the present application;
fig. 3c is a schematic diagram three of four NFC technology polling operations according to an embodiment of the present application;
fig. 4a is a schematic diagram of three NFC technology polling operations according to an embodiment of the present application;
fig. 4b is a schematic diagram two of three NFC technology polling operations according to an embodiment of the present application;
fig. 5 is a schematic diagram of two NFC technology polling operations according to an embodiment of the present application.
Detailed Description
Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present application are shown in the drawings, it is to be understood that the present application may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and examples of the present application are for illustrative purposes only and are not intended to limit the scope of the present application.
It should be understood that the various steps recited in the method embodiments of the present application may be performed in a different order and/or performed in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present application is not limited in this respect.
The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments. Related definitions of other terms will be given in the description below. It should be noted that the terms "first," "second," and the like herein are merely used for distinguishing between different devices, modules, or units and not for limiting the order or interdependence of the functions performed by such devices, modules, or units.
It should be noted that references to "one" or "a plurality" in this application are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be interpreted as "one or more" unless the context clearly indicates otherwise.
The names of messages or information interacted between the various devices in the embodiments of the present application are for illustrative purposes only and are not intended to limit the scope of such messages or information.
The NFC standard defines a polling mode as a communication mode of an NFC device when generating a carrier wave or modulated wave and detecting or polling a nearby tag, device or object, further the NFC device may be described as a card reader and the tag, device or object of the accessory may be described as a card.
The near field communication method provided by the embodiment of the application can further improve the communication performance of near field communication equipment under the condition of reducing polling power consumption.
As shown in fig. 1, a near field communication method according to an embodiment of the present application includes:
performing low-power card detection until at least one near field communication device is detected or the low-power card detection is performed to reach a preset condition;
specifically, fig. 2 depicts a schematic diagram of a polling operation in the related art, in which the rf module periodically transmits rf pulses, which are typically carrier pulses of a short duration that are not modulated, in which mode the rf module consumes less power. In the low power card detection mode, if the target object (at least one near field communication device) is detected to be close to or execute the low power card detection to reach a preset condition, the full power polling mode is entered. The power consumption required for the full power polling mode is higher and the power consumption required for the low power card detection mode is lower because the former requires a longer time to transmit a radio frequency field than the latter. It should be noted that low power card detection and full power polling are typically performed periodically and alternately in sequence until the target object is detected over a long period of time.
In one implementation, the low power card detection is performed to reach a preset condition, the low power iteration number n is read from the memory, and the NFC device may perform the low power card detection n times, where each low power card detection is displayed as a radio frequency pulse; the number of polls n may be set by the user or preset in the NFC device. Next, after n times of low power card detection, the NFC device performs full power polling, at which time the NFC device does not detect the presence of any target object in the vicinity by detecting a signal corresponding to the low power card detection.
In another implementation manner, when the low-power card detection is performed to reach the preset condition, the preset duration t1 of the low-power card detection pulse transmission is read from the timer, the duration of the low-power card detection executable by the NFC device reaches the preset duration t1 of the timer, the timer can count forward or count down, and the preset duration t1 can be set as required. Next, after the duration of the low power card detection reaches the preset duration t1 of the timer, the NFC device performs full power polling, when the NFC device does not detect the presence of any target object in the vicinity by detecting a signal corresponding to the low power card detection.
The near field communication method in the related art combines low-power card detection and full-power polling, so that the electric quantity consumed by the full-power polling can be saved.
The near field communication method of the embodiment of the application further comprises the following steps: the reader employs different transmit powers for different NFC technologies to perform the full power polling.
In one implementation, NFC technology includes: at least one of NFC-A, NFC-B, NFC-F or NFC-V.
Different NFC technologies correspond to different communication modes, and cards are a carrier of NFC technologies, so card types are typically distinguished according to different NFC technologies. Specifically, the communication modes include a Type a technology-based communication mode, a Type B technology-based communication mode, a Type F technology-based communication mode, and a Type V technology-based communication mode; common card types include Type a, type B, type F, type V cards.
In one possible implementation, full power polling refers to polling all polling flows of the four NFC technology types NFC-A, NFC-B and NFC-F and NFC-V defined in the NFC protocol, and the reader uses different transmit powers for the four different NFC technologies described above to perform the full power polling.
For card readers supporting different technologies, when attempting to read a card, the technology adopted by the card cannot be judged in advance, so that a mode of polling different NFC technologies is generally adopted, and a polling command of which technology is to be replied by the card is looked up, so that the technology adopted by the card is determined.
Different types of cards have different voltages to be activated (i.e. to work normally) due to different antennas, used chips, technologies etc., i.e. different transmitting powers of the card readers required for different types of cards. For example, cards of NFC-B technology generally require a reader to be activated with a greater transmit power at the same distance, whereas cards of NFC-F technology and NFC-V technology generally do not require a reader to be activated with as much transmit power.
In particular, if the card reader uses a larger transmission power, although it is possible to increase the communication distance of the cards of NFC-B technology, it is disadvantageous to the distance of reading the cards of NFC-F technology and NFC-V technology, and even results in a reduced distance of reading these cards. This is because if the card of NFC-F technology and NFC-V technology is activated by the reader through the radio frequency field with a certain transmitting power, if the transmitting power of the reader is continuously increased, the reply signal fed back to the reader by the card will be weakened due to the enhancement of the radio frequency field, and the weakening of the reply signal will cause the decoding failure of the reader, thereby reducing the communication distance. On the other hand, if the reader uses less transmit power, the distance to read cards such as NFC-F technology and NFC-V technology may be increased, but the communication distance with NFC-B technology cards may be decreased. Therefore, the same transmitting power is adopted by the card reader, so that the card reader cannot simultaneously read the communication distances of different cards.
Therefore, the card reader adopts different transmitting power aiming at the four different NFC technologies to execute the full-power polling, so that the card reading distance of the card reader to the cards of the different NFC technologies can be maximized, and the communication performance problem of the near field communication equipment can be effectively improved.
Since for the card reader, the transmitting power can be increased by setting a larger transmitting voltage, thereby generating a large transmitting field. In one possible implementation manner, the transmitting voltages corresponding to different NFC technologies can be respectively configured in a register or a memory, and the transmitting voltages corresponding to the NFC technologies are acquired by a card reader during polling so as to generate a transmitting field, so that the card reader adopts different transmitting powers for different NFC technologies to perform the full-power polling. The transmitting field comprises a card polling command, wherein the card polling command is used for acquiring a reply signal of a target card.
In an implementation, in case that the NFC technology performing the full power polling includes four of NFC-A, NFC-B, NFC-F and NFC-V, the polling procedure includes the following procedures:
acquiring a first transmitting voltage corresponding to a first NFC technology through a card reader, so as to transmit a first transmitting field with first power;
if the reply signal responding to the first transmitting field is not received;
acquiring a second transmitting voltage corresponding to a second NFC technology through a card reader so as to transmit a second transmitting field with second power;
if a reply signal responding to the second transmitting field is not received;
acquiring a third transmitting voltage corresponding to a third NFC technology through a card reader, so as to transmit a third transmitting field with third power;
if a reply signal responding to the third transmitting field is not received;
acquiring a fourth transmitting voltage corresponding to a fourth NFC technology through a card reader, so as to transmit a fourth transmitting field with fourth power;
wherein at least two of the first power, the second power, the third power, and the fourth power are different.
And it is understood that the first NFC technology to the fourth NFC technology may be one of NFC-A, NFC-B, NFC-F and NFC-V, respectively.
It should be noted that, in the polling process, if a reply signal is received in response to the transmitting field, the corresponding communication mode is adopted to communicate with the target card according to the current technology type.
In particular, fig. 3a-3c depict schematic diagrams of four NFC technology polling operations according to embodiments of the present application.
As shown in fig. 3 se:Sub>A, the transmitting power adopted by the NFC-se:Sub>A technology is se:Sub>A first power P1, the transmitting power adopted by the NFC-B technology is se:Sub>A second power P2, the transmitting power adopted by the NFC-F technology is se:Sub>A third power P3, and the transmitting power adopted by the NFC-V technology is se:Sub>A fourth power P4. Wherein P1, P2, P3, P4 are different from each other.
As shown in fig. 3B, the transmitting power adopted by the NFC-se:Sub>A technology is P1, the transmitting power adopted by the NFC-B technology is P2, the transmitting power adopted by the NFC-F technology is P3, and the transmitting power adopted by the NFC-V technology is P3. Wherein, P1, P2 and P3 are different from each other, and the transmitting power P3 adopted by the NFC-F technology and the NFC-V technology is the same.
As shown in fig. 3c, the transmitting power adopted by the NFC-se:Sub>A technology is P1, the transmitting power adopted by the NFC-B technology is P1, the transmitting power adopted by the NFC-F technology is P1, and the transmitting power adopted by the NFC-V technology is P4. Wherein P1 and P4 are different from each other, and the transmitting power P1 adopted by the NFC-A technology, the NFC-B technology and the NFC-F technology is the same.
In other embodiments, the transmitting powers P1, P2, P3, P4 used by the NFC-se:Sub>A/B/F/V technology may be optionally combined in at least two different manners, and the order of the NFC-se:Sub>A/B/F/V technology may be optionally exchanged, that is, on this basis, the duration, transmitting power, polling order and number of times of each NFC technology may be set according to actual needs, and the specific embodiment of fig. 3 se:Sub>A-3B is not limited to this application.
In another implementation, in the case where the NFC technology performing the full power polling includes any three of NFC-A, NFC-B, NFC-F and NFC-V, the polling procedure includes the following procedure:
acquiring a first transmitting voltage corresponding to a first NFC technology through a card reader, so as to transmit a first transmitting field with first power;
if the reply signal responding to the first transmitting field is not received;
acquiring a second transmitting voltage corresponding to a second NFC technology through a card reader so as to transmit a second transmitting field with second power;
if a reply signal responding to the second transmitting field is not received;
acquiring a third transmitting voltage corresponding to a third NFC technology through a card reader, so as to transmit a third transmitting field with third power;
wherein at least two of the first power, the second power, and the third power are different.
In particular, fig. 4a-4b depict schematic diagrams of three NFC technology polling operations according to embodiments of the present application.
As shown in fig. 4 se:Sub>A, the transmitting power adopted by the NFC-se:Sub>A technology is P1, the transmitting power adopted by the NFC-B technology is P2, and the transmitting power adopted by the NFC-F technology is P3. Wherein P1, P2, P3 are different from each other.
As shown in fig. 4B, the transmitting power adopted by the NFC-B technology is P2, the transmitting power adopted by the NFC-F technology is P3, and the transmitting power adopted by the NFC-V technology is P3. Wherein P2 and P3 are different, and the transmitting power P3 adopted by the NFC-F technology and the NFC-V technology is the same.
In other embodiments, P1, P2, P3 may be optionally combined by at least two different combinations, and the order of NFC-se:Sub>A/B/F/V technology may be optionally changed. That is, on this basis, the duration, the transmission power, and the polling order and the number of times of each NFC technology may be set according to actual needs, and the specific embodiments of fig. 4a-4b are not limiting to the present application.
In another implementation, in the case where the NFC technology performing full power polling includes any two of NFC-A, NFC-B, NFC-F and NFC-V, the polling procedure includes the following procedure:
acquiring a first transmitting voltage corresponding to a first NFC technology through a card reader, so as to transmit a first transmitting field with first power;
if the reply signal responding to the first transmitting field is not received;
acquiring a second transmitting voltage corresponding to a second NFC technology through a card reader so as to transmit a second transmitting field with second power;
wherein the first power is different from the second power.
Specifically, fig. 5 depicts a schematic diagram of two NFC technology polling operations according to an embodiment of the present application.
As shown in fig. 5, the NFC-se:Sub>A technology uses se:Sub>A transmission power of P1, and the NFC-B technology uses se:Sub>A transmission power of P2. P1 and P2 are different.
In other embodiments, any two of the NFC-se:Sub>A/B/F/V technologies may be selected to perform full power polling, and the order of the NFC-se:Sub>A/B/F/V technologies may be changed arbitrarily. That is, on this basis, the duration, the transmission power, and the polling order and the number of times of each NFC technology may be set according to actual needs, and the embodiment of fig. 5 is not limited to this application.
By setting two or more NFC technologies to poll and adopting different transmitting powers by the card reader for different NFC technologies to perform the polling, the communication performance of the near field communication device can be further improved, and the maximization of the card reading distance of cards with different NFC technologies is realized.
In general, two or more NFC technologies are selected for polling according to different application scenarios, that is, polling requirements for the NFC technologies are different in different scenarios, or differences exist between card types detected by the card readers in different scenarios. For example, when a mobile phone is used as a card reader, it is generally required that all types a, B, F, V of cards can be read, so polling is performed for the above four NFC technologies; when the metro gate is used as a card reader, for example, a Shenzhen metro, the detection of Type A and Type F metro cards is usually required to be supported, so that polling can be performed aiming at the two NFC technologies, different transmitting powers are adopted to perform polling, the communication performance of near field communication equipment can be further improved, and the maximization of card reading distances of cards of different NFC technologies is realized.
In one implementation manner, the transmitting power corresponding to the NFC-B technology is greater than the transmitting power corresponding to the NFC-F technology and the NFC-V technology, and the transmitting power corresponding to the NFC-se:Sub>A technology is greater than the transmitting power corresponding to the NFC-F technology and the NFC-V technology but less than the transmitting power corresponding to the NFC-B technology, so that the card reading distance of the card reader to the cards of different NFC technologies is maximized.
For example, assume that the maximum transmit voltage supported by the NFC chip is 3.3V and the minimum transmit voltage is 1.1V. In the full power polling process, if the transmitting voltages of different NFC technologies A/B/F/V are all 3.3V, the NFC-B technology can reach the maximum communication distance under the situation, but at the moment, the communication distance between the NFC-F technology and the NFC-V technology also has a continuous lifting space; if the transmitting voltages of the different NFC technologies A/B/F/V are 1.65V, the communication distance between the NFC-F and the NFC-V technology is obviously improved compared with the transmitting voltage of 3.3V, but the communication distance between the NFC-B technology is reduced and the maximum communication distance cannot be reached; therefore, the transmitting voltage of the NFC-B technology is set to be larger than the transmitting voltages of the NFC-F technology and the NFC-V technology, so that the transmitting power corresponding to the NFC-B technology is larger than the transmitting power corresponding to the NFC-F technology and the NFC-V technology, and the card reading distance of a card reader to the NFC-B/F/V technology card can be maximized.
In another implementable embodiment, the performing low power card detection includes: the transmit power at which each low power card detection is performed is the same or different. Specifically, the transmitting power detected by the low-power card is set to be different, different transmitting voltages can be periodically adopted by the pulse detected by the low-power card, for example, in the case that the maximum transmitting voltage supported by the NFC chip is 3.3V and the minimum transmitting voltage is 1.1V, the transmitting voltages of the radio frequency pulse in the low-power card detection are periodically changed by respectively adopting 3.3V, 2.2V and 1.1V, so that the transmitting power for executing each low-power card detection is also different. At this time, when the low-power card detection is performed, the detection sensitivity of different transmitting powers to each target card is also different, so that the card detection performance is further improved.
In a possible implementation manner, the present solution further includes a near field communication device, including: a near field communication controller for performing the near field communication method described above.
In a possible embodiment, the near field communication system further includes: the card reader performs a near field communication interaction process with the card based on the near field communication method.
It should be understood that the specific examples in the embodiments of the present application are only for helping those skilled in the art to better understand the embodiments of the present application, and not limit the scope of the embodiments of the present application, and those skilled in the art may make various improvements and modifications based on the above embodiments, and these improvements or modifications fall within the protection scope of the present application.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (13)
1. A near field communication method, comprising:
performing low-power card detection until at least one near field communication device is detected or the low-power card detection is performed to reach a preset condition;
performing full power polling;
the method is characterized in that: the reader employs different transmit powers for different NFC technologies to perform the full power polling.
2. The near field communication method of claim 1, wherein the preset condition comprises:
the times of executing the low-power card detection reach the times of detecting the low-power card n;
alternatively, the duration of performing the low power card detection reaches a preset duration.
3. The near field communication method of claim 1, wherein the NFC technology comprises: at least one of NFC-A, NFC-B, NFC-F or NFC-V.
4. The near field communication method of claim 1, wherein transmission voltages corresponding to different NFC technologies are respectively configured in a register or a memory, so that a card reader adopts different transmission powers for different NFC technologies to perform the full power polling.
5. The near field communication method of claim 3, wherein, in a case where the NFC technology performing full power polling comprises one of NFC-A, NFC-B, NFC-F and NFC-V:
and acquiring a transmitting voltage corresponding to the NFC technology through a card reader so as to generate a transmitting field, wherein the transmitting field comprises a card polling command, and the card polling command is used for acquiring a reply signal of a target card.
6. The near field communication method of claim 3, wherein in the case where the NFC technology performing full power polling includes any two of NFC-A, NFC-B, NFC-F and NFC-V:
acquiring a first transmitting voltage corresponding to a first NFC technology through a card reader, so as to transmit a first transmitting field with first power;
if the reply signal responding to the first transmitting field is not received;
acquiring a second transmitting voltage corresponding to a second NFC technology through a card reader so as to transmit a second transmitting field with second power;
wherein the first power is different from the second power.
7. The near field communication method of claim 3, wherein in the case where the NFC technology performing full power polling includes any three of NFC-A, NFC-B, NFC-F and NFC-V:
acquiring a first transmitting voltage corresponding to a first NFC technology through a card reader, so as to transmit a first transmitting field with first power;
if the reply signal responding to the first transmitting field is not received;
acquiring a second transmitting voltage corresponding to a second NFC technology through a card reader so as to transmit a second transmitting field with second power;
if a reply signal responding to the second transmitting field is not received;
acquiring a third transmitting voltage corresponding to a third NFC technology through a card reader, so as to transmit a third transmitting field with third power;
wherein at least two of the first power, the second power, and the third power are different.
8. The near field communication method of claim 3, wherein, in a case where the NFC technology performing full power polling includes four of NFC-A, NFC-B, NFC-F and NFC-V:
acquiring a first transmitting voltage corresponding to a first NFC technology through a card reader, so as to transmit a first transmitting field with first power;
if the reply signal responding to the first transmitting field is not received;
acquiring a second transmitting voltage corresponding to a second NFC technology through a card reader so as to transmit a second transmitting field with second power;
if a reply signal responding to the second transmitting field is not received;
acquiring a third transmitting voltage corresponding to a third NFC technology through a card reader, so as to transmit a third transmitting field with third power;
if a reply signal responding to the third transmitting field is not received;
acquiring a fourth transmitting voltage corresponding to a fourth NFC technology through a card reader, so as to transmit a fourth transmitting field with fourth power;
wherein at least two of the first power, the second power, the third power, and the fourth power are different.
9. The near field communication method of claim 8, wherein se:Sub>A transmit power corresponding to the NFC-B technology is greater than transmit powers corresponding to the NFC-F technology and the NFC-V technology, and se:Sub>A transmit power corresponding to the NFC-se:Sub>A technology is less than transmit powers corresponding to the NFC-F technology and the NFC-V technology to maximize se:Sub>A card reading distance of se:Sub>A card reader for different NFC technology cards.
10. The near field communication method of claim 1, wherein the performing low power card detection comprises: the transmit power is the same for each low power card detection.
11. The near field communication method of claim 1, wherein the performing low power card detection comprises: the transmit power for performing each low power card detection is different.
12. A near field communication device, comprising: near field communication controller for performing the near field communication method of claims 1-11.
13. A near field communication system, characterized in that,
comprising the following steps:
card reader and card, the card reader performing a near field communication interaction procedure with the card based on the near field communication method of claims 1-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410057052.6A CN117879654A (en) | 2024-01-15 | 2024-01-15 | Near field communication method, device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410057052.6A CN117879654A (en) | 2024-01-15 | 2024-01-15 | Near field communication method, device and system |
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| CN117879654A true CN117879654A (en) | 2024-04-12 |
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