A smart card meter based on NB-IoT Internet of Things and its use method

Abstract

The present invention relates to the field of radio frequency identification technology and NB‑IoT Internet of Things technology, and in particular to a smart card meter based on NB‑IoT Internet of Things and a method of using the same. The water meter terminal is connected to an online platform via NB‑IoT, the online platform is connected to a computer, the computer is connected to a card reader, and the card reader identifies an M1 card. A card-seeking circuit is provided in the water meter terminal, and the card-seeking circuit includes an MCU, the MCU is connected to a level generator, the level generator is connected to a forward signal comparator, and the forward signal comparator is also connected to a rectifier filter. The beneficial effects of the present invention are as follows: the present invention discloses a radio frequency IC card (high frequency card) smart water meter based on NB‑IoT Internet of Things technology, which is compatible with the advantages of IC card meters and solves the problems of security and stand-alone models. The increase and enrichment of functions undoubtedly brings specific pressure to power consumption. The present invention balances product energy consumption while ensuring rich functions and user experience.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency identification technology and NB-IoT Internet of Things technology, and in particular to a smart card table based on NB-IoT Internet of Things using dynamic password technology and ultra-low power consumption card searching technology and a use method thereof. Background Art

[0002] At present, with the popularization and promotion of smart water services, the functional requirements for terminal water meters are getting higher and higher. Among them, prepaid terminals are mainly IC card smart water meters, which are favored by the market due to their simple operation, flexible application and self-fee settlement. However, ordinary radio frequency IC card water meters also have many limitations, such as security and single-machine models need to be improved. In addition, the high-frequency radio frequency card search task also brings a considerable power loss.

[0003] The mainstream NB-IoT Internet of Things technology is becoming increasingly mature, achieving interconnection between terminals and platforms, and realizing digital, intelligent and standardized management. However, as a prepaid system terminal, independent NB-IoT products cannot meet the actual environment. In order to save electricity, the NB-IoT terminal water meter is in a "dormant" state most of the time, and the platform and NB-IoT terminal cannot communicate in real time. Therefore, prepaid products are still mainly based on radio frequency IC cards, which can be swiped and recharged in real time.

[0004] To this end, this application designs a smart card table based on NB-IoT Internet of Things technology to solve the above problems. Summary of the invention

[0005] In order to make up for the deficiencies in the prior art, the present invention provides a smart card meter based on NB-IoT Internet of Things and a method of using the same, which utilizes data interaction between a terminal and a platform to adjust radio frequency RFID identification parameters and a card reading key to form a dynamic password design.

[0006] The present invention is achieved through the following technical solutions:

[0007] A smart card meter based on NB-IoT Internet of Things, including a water meter terminal, characterized in that:

[0008] The water meter terminal is connected to the online platform via NB-IoT, the online platform is connected to a computer, the computer is connected to a card reader, and the card reader recognizes the M1 card;

[0009] The water meter terminal is provided with a card-seeking circuit, which includes an MCU, the MCU is connected to a level generator, the level generator is connected to a forward signal comparator, and the forward signal comparator is also connected to a rectifier filter.

[0010] Furthermore, in order to better implement the present invention, in the M1 card, the control block structure includes A0~A5 as password A, designed as data reading key, fixed and not updated; B0~B5 as password B, data writing operation key, dynamically updated; FF80 position as a cache area.

[0011] Furthermore, in order to better realize the present invention, the rectifier filter is an electronic low-pass filter, the front-end input passes through Q1, the electronic filter composed of R1 and C1 acts as a capacitor amplified n times, R1 / C1, R2 / C3, R3 / C4 are the main parts of the RC filter circuit, and the parameter ranges of resistance and capacitance are calculated by the cut-off frequency formula f=1 / (2πRC), and the corresponding parameters are determined by adjusting the scenario with or without a card.

[0012] Based on the above-mentioned NB-IoT-based smart card table, its use method includes the following steps:

[0013] S1, fixed factory settings, the product read / write card key A / B uses a fixed algorithm to solidify in the water meter, waiting for the operation of the read / write card, during which the low-power AD card search mode is executed, and the card search is broadcast at intervals of 500ms;

[0014] S2, after the user activates the card and recharges on the online platform, the configuration block of the M1 card is rewritten to FF 68 77 78, and the key A / B uses the same fixed algorithm as the water meter to set the card password block. At the same time, the key B updated by the online platform is cached in the key designated area;

[0015] S3, the user swipes the card, and the water meter terminal reads and writes the card content, including key verification, data analysis, data write-back and data protection encryption, and performs the normal actions of the water meter terminal;

[0016] S4, encapsulates the attribute data of the water meter terminal, including the corresponding parameters of RFID, key A / B and the register configuration of the reader IC, encapsulates the user data, including the user number, user balance and water consumption, and the water meter terminal starts the networking program, interacts with the platform downlink data through the terminal uplink, and completes the data transmission response. After the interaction is successful, the platform and the terminal synchronously update the settings, change the key B, and dynamically manage the key. According to the reported RFID card AD value LPCD_THRESHOLD, set the reader IC register (JREG_LPCD_CTRL1, JREG_LPCD_CTRL2) configuration to ensure the card reading stability in complex environments.

[0017] Furthermore, in order to better realize the present invention, the card search in S1 is specifically that the rectifier filter rectifies the RF carrier waveform, outputs signal A, the MCU actively modulates the analog output of the level generator, outputs signal B, and the forward signal comparator set at the end compares the level of signal A / B, outputs different digital signals, and transmits them to the MCU as a result of the card search.

[0018] The beneficial effects of the present invention are:

[0019] This case invented a radio frequency IC card (high frequency card) smart water meter based on NB-IoT Internet of Things technology, which is compatible with the advantages of IC card meters and solves the problems of security and single-machine type. The increase and enrichment of functions undoubtedly brings specific pressure on power consumption. The present invention balances the product energy consumption while ensuring rich functions and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a network diagram of the networking work of the present invention;

[0021] Figure 2 It is the structure diagram of the M1 card control block of the present invention;

[0022] Figure 3 The following is a flow chart of the implementation method of the dynamic password of the present invention;

[0023] Figure 4 A card-searching circuit diagram of the present invention;

[0024] Figure 5 A circuit diagram of a rectifier filter of the present invention;

[0025] Figure 6 It is a radio frequency peak value diagram when there is no card in the radio frequency area of ​​the present invention;

[0026] Figure 7 This is a peak-to-peak value diagram of radio frequency when a card approaches the radio frequency area of ​​the present invention.

[0027] In the figure, 1. water meter terminal, 2. online platform, 3. computer, 4. card reader, 5. M1 card, 101. MCU, 102. rectifier filter, 103. level generator, 104. forward signal comparator. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0035] Figure 1-Figure 7 A specific embodiment of the present invention is a smart card table based on NB-IoT Internet of Things and a method of using the same. Figure 1As shown in the networking working network diagram, this embodiment includes a water meter terminal 1, an online platform 2, a computer 3, a card reader 4 and an M1 card 5. The 13.56M Class A M1 card complies with the smart card ISO14443 standard protocol, and this embodiment also implements the standard. The card operation steps are Request (search for card) → Anticoll (anti-collision) → Select (select card) → Authenti (key verification), where the first three steps are the same as the conventional design. In Authenti, this embodiment links the NB-IoT technology to perform dynamic verification, that is, after each card recharge, the system will update a new set of keys, and the water meter terminal 1 and the online platform 2 will be updated synchronously.

[0036] like Figure 2 As shown in the M1 card control block structure of this embodiment, A0~A5: password A, designed as a data read key, fixed and not updated; B0~B5: password B, data write operation key, dynamically updated. The implementation method and specific steps of the dynamic password are as follows Figure 3 shown.

[0037] The embodiment adopts an ultra-low power consumption card search logic design, which reduces the power consumption by 80% compared with the conventional timed card search. At the same time, it links with NB-IoT Internet of Things to meet the needs of dual-channel services. The specific method is:

[0038] The RF carrier waveform is rectified and filtered by hardware to output signal A;

[0039] The MCU actively modulates the analog output of the level generator, outputting signal B;

[0040] A positive signal (voltage) comparator is set at the end to compare the level of signal A / B, output different digital signals, and transmit them to MCU as the result of card search. Figure 4 . Figure 4 The circuit diagram of the rectifier filter in Figure 5 .

[0041] Among them: ① The rectifier filter is designed as an electronic low-pass filter. The filtering performance of the electronic filter is very good. The front-end input passes through the electronic filter composed of Q1, R1, and C1, which is equivalent to a capacitor that is amplified n times. The amplification factor depends on the selection of Q1 and the equivalent capacitance amplification.

[0042] ② R1 / C1, R2 / C3, and R3 / C4 are the main parts of the RC filter circuit. Because R1 only provides the base bias current of Q1, a parameter with a larger resistance value can be selected. In this way, the filter effect of the R1 / C1 combination is already very good. Combined with the assistance of the second-order R2 / C3 and third-order R3 / C4 filters, the output Uo signal is sufficient to meet the level logic requirements.

[0043] Through the cut-off frequency formula f=1 / (2πRC), the parameter ranges of resistance and capacitance can be reasonably calculated, and the corresponding parameter scheme can be determined by adjusting the scenarios with and without cards.

[0044] ③ The design of this card search, combined with the calibration of the software, has strong anti-interference ability. It can still maintain correct triggering even in the level fluctuations and signal interference caused by NB-IoT networking conditions.

[0045] ④ The RF peak-to-peak value of the RF area with or without a card is very different, which can well identify whether the RF card is close, such as Figure 6 ,7 is the comparison of the peak value of the RF signal with and without a card.

[0046] The specific usage method of this embodiment is as follows:

[0047] In the first step, the product uses a fixed algorithm to fix the card key A / B in the water meter, waiting for the card to be read and written, during which the low-power AD card search mode is executed, and the card search is broadcast at a period of 500ms. This setting is a fixed factory setting.

[0048] In the second step, after the user platform activates the card and recharges, the configuration block of the M1 card is rewritten to FF 68 77 78, and the key A / B is set in the card password block (block 3 of each sector) using the same fixed algorithm as the water meter. At the same time, the key B updated by the platform is cached in the key designated area;

[0049] In the third step, the user swipes the card, and the product reads and writes the card content, including key verification, data parsing, data write back, and data protection encryption, and performs routine product actions.

[0050] The fourth step is to encapsulate the product's attribute data, including RFID corresponding parameters, key A / B and reader IC register configuration, and encapsulate user data, including user number, user balance, water consumption, etc. The product terminal starts the networking program, and completes the data transmission response through the terminal uplink and platform downlink data interaction. The focus of the project of the present invention is the platform update of attribute data. After the interaction is successful, the platform and the terminal synchronize the update settings, change the key B, and dynamically manage the key. According to the reported RFID card AD value LPCD_THRESHOLD, the reader IC register (JREG_LPCD_CTRL1, JREG_LPCD_CTRL2) configuration is set to ensure the stability of card reading in complex environments.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for using a smart card meter based on NB-IoT Internet of Things, characterized in that: The following steps are involved: S1, fixed factory settings, the product read / write card key A / B uses a fixed algorithm to solidify in the water meter, waiting for the operation of the read / write card, during which the low-power AD card search mode is executed, and the card search is broadcast at intervals of 500ms; S2, after the user activates the card and recharges on the online platform, the configuration block of the M1 card is rewritten to FF 68 77 78, and the key A / B uses the same fixed algorithm as the water meter to set the card password block. At the same time, the key B updated by the online platform is cached in the key designated area; S3, the user swipes the card, and the water meter terminal reads and writes the card content, including key verification, data analysis, data write-back and data protection encryption, and performs the normal actions of the water meter terminal; S4, encapsulates the attribute data of the water meter terminal, including the corresponding parameters of RFID, key A / B and the register configuration of the reader IC, encapsulates the user data, including the user number, user balance and water consumption, and the water meter terminal starts the networking program, interacts with the platform downlink data through the terminal uplink, and completes the data transmission response. After the interaction is successful, the platform and the terminal synchronously update the settings, change the key B, and dynamically manage the key. According to the reported RFID card AD value LPCD_THRESHOLD, the register configuration of the reader IC is set to ensure the stability of card reading in complex environments.

2. The method for using the smart card meter based on the NB-IoT Internet of Things according to claim 1 is characterized in that: The card search in S1 is specifically as follows: the rectifier filter rectifies the RF carrier waveform to output signal A, the MCU actively modulates the analog output of the level generator to output signal B, and the forward signal comparator set at the end compares the level of signal A / B, outputs different digital signals, and transmits them to the MCU as a result of the card search.

3. The method for using the smart card meter based on the NB-IoT Internet of Things according to claim 1, characterized in that: The NB-IoT-based smart card meter comprises a water meter terminal (1), wherein the water meter terminal (1) is connected to an online platform (2) via NB-IoT, the online platform (2) is connected to a computer (3), the computer (3) is connected to a card reader (4), and the card reader (4) identifies an M1 card (5); The water meter terminal (1) is provided with a card search circuit, the card search circuit comprising an MCU (101), the MCU (101) is connected to a level generator (103), the level generator (103) is connected to a positive signal comparator (104), and the positive signal comparator (104) is also connected to a rectifier filter (102); In the M1 card (5), the control block structure includes A0-A5 as password A, designed as a data read key, fixed and not updated; B0-B5 as password B, a data write operation key, dynamically updated; FF80 position as a buffer area; The rectifier filter (102) is an electronic low-pass filter. The front-end input passes through Q1. The electronic filter composed of R1 and C1 acts as a capacitor that is amplified n times. R1 / C1, R2 / C3, and R3 / C4 act as the main parts of the RC filter circuit. The range of various parameters of resistance and capacitance are calculated by the cut-off frequency formula f=1 / (2πRC). The corresponding parameters are determined by adjusting the situation when there is a card or not.

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