NFC technology has been favored by the mobile phone market as an emerging technology in the past few years. Almost all of them have NFC functions in mobile phones. However, NFC related functions and usage have not been followed up, so that NFC was once labeled as "RBL". "The label, and with the gradual development in recent years, NFC has once again become one of the concerns of everyone on the new mobile phone, then what can NFC do now?
What is NFC?NFC is known as Near Field CommunicaTIon, a Chinese name near field communication, a short-range high-frequency wireless communication technology based on RFID (contactless radio frequency identification) evolution, by Philips Semiconductors (later NXP Semiconductors, NXP Semiconductors, Recently acquired by Qualcomm), Nokia and Sony jointly developed.
The NFC logo is a good expression of how the technology communicates.
NFC is based on RFID and interconnect technology, so NFC can be backward compatible with RFID, and it also shows the characteristics of RFID in its use: non-contact. NFC can only communicate with one target at a time, the data exchange distance is within 10-20cm, and the maximum transmission rate is 424kbit/s.
According to NFC's technical specifications, all NFC devices must have active and passive modes of operation, such as Car EmulaTIon Mode, P2P Mode, and Reader/Writer Mode.
For more information on NFC technology, see "What is NFC chip?" How to use the mobile phone NFC function? 》
What can NFC do now?NFC's application methods are Touch and Go, Touch and Pay, Touch and Connect, and Touch and Explore, and there are almost no NFCs in China three years ago. Different ways of doing things, NFC can now be said to be a full-featured application.
NFC tagNFC tags have contact-through applications, similar to RFID applications, such as cell access cards, but this is less common on mobile phones. There is also a contact browsing, mainly to identify and track objects with NFC information, such as the Nintendo 3DS game console, through the NFC to identify the amiibo hand, will display the corresponding content on the screen, amibo hand is an NFC tag Some NFC electronic tags can be written with simple commands to activate the functions specified on the activated phone, such as writing a command to switch the mute mode on the tag. When the tag is close to the phone, the phone will automatically mute.
Nintendo's amiibo hand application to NFC tags
data transmissionIn terms of data transmission, NFC is practical for Bluetooth transmission. NFC only plays the role of establishing a connection. Therefore, in the process of data transmission, the user does not need to keep the NFC area on the two devices close. Currently, the NFC transmission is still based on pictures and texts. Small files such as web links, Samsung S Beam uses NFC to establish connections, Wi-Fi transmission, you can achieve large file exchange, but only between Samsung phones.
On the Bluetooth pairing, NFC also has the role of this "matchmaker". Two Bluetooth devices that support NFC pairing can be quickly paired between the two devices by simply moving closer to each other. Among them, Sony, one of the founders of NFC technology, is quite active in this regard, and almost all of its existing wireless products already support NFC pairing.
Mobile paymentMobile payments have become popular in recent years, and contactless payments have made NFC truly useful. In China, mobile phones use NFC for mobile payment. In fact, they are all related to UnionPay. Regardless of Pay or HCE, they use the UnionPay cloud flash service.
Samsung Zhifu
At present, the main Pay-type NFC payment in China is Apple Pay, Samsung Pay, Huawei Pay and Xiaomi. This uses the NFC card emulation mode, but it is not the complete card information of the bank card in the mobile phone. Is to form a special Token number, the Token is transmitted to the POS machine through NFC communication at the time of payment, and the POS machine sends the Token and the transaction amount to UnionPay and the bank to verify and complete the transaction. In this process, the mobile phone does not need to be connected to the network. It is equivalent to your physical bank card.
In order to ensure security, this type of Pay also requires a built-in SE (Secure Element) security module for storing Token information. Apple Apple Pay uses TouchID fingerprinting for Token reading and transaction confirmation. Samsung Pay, Huawei Pay and Xiaomi pay for the electron SE module, and the implementation principle is basically the same.
Apple Pay
NFC payment also has the HCE method. There is no Andorid Pay in China. The payment performance includes NFC-SIM card and UnionPay cloud flash card. The NFC-SIM card requires a special SIM card provided by the operator and is used in conjunction with the operator's wallet APP. UnionPay cloud flash payment card is relatively simple, only need to install cloud flash payment APP or APP of major banks on the supported NFC-enabled mobile phones.
Compared with Alipay and WeChat's scan code payment, mobile payment based on NFC technology is more convenient and smooth in the use experience. Only when the mobile phone is close to the POS machine, the payment program will be started, and the confirmation of fingerprint identification is relatively safer. . Of course, NFC mobile payment requires mobile phone support for NFC, mobile phone manufacturers cooperate with banks, and POS machine support and other preliminary preparations, the cost is high, and it is difficult to popularize it for a long time.
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