NFC Function In The Daily Life

- Jun 25, 2018 -

NFC Function in the daily life

NFC English name Near Field Communication, short-range wireless communication


background


The Pan-European Union has been established by a number of companies, universities and users. Both are developing open architectures for NFC and are promoting their use in mobile phones. NFC has evolved from the integration of non-contact radio frequency identification (RFID) and interconnection technologies. It combines inductive readers, proximity cards, and peer-to-peer functions on a single chip to enable identification and data with compatible devices within short distances. exchange. This technology was originally a simple merger of RFID technology and network technology. Now it has evolved into a short-range wireless communication technology. The development trend is quite rapid.


Like RFID, NFC information is also transmitted through the electromagnetic induction coupling of the radio frequency part of the spectrum, but there is still a big difference between the two. First of all, NFC is a wireless connection technology that provides easy, secure, and rapid communication. Its transmission range is smaller than that of RFID, and the transmission range of RFID can reach several meters or even tens of meters. However, since NFC has adopted a unique signal attenuation technology, Compared with RFID, NFC has features such as proximity, high bandwidth, and low power consumption. Second, NFC is compatible with existing contactless smart card technology and has now become the official standard that is supported by more and more major vendors.


Folding this paragraph of technology


Let us look at two basic requirements for any wireless association model:


a. Secure link


Encrypted wireless links require a public key, and the in-band channel must be invisible. The link key is generated "in real time" by a manual PIN (such as in Bluetooth) or a Diffie-Hellman automatic exchange (such as in wireless USB). After the link key is established, symmetric encryption (based on 3DES, AES, etc.) can be enabled.


b. Device Authentication


That is, it is ensured that the linking key is generated with the intended authentication device and not the disguised passive/active intermediary. The conventional method of this setup requires connecting a cable in order to associate and exchange link keys and/or require the user to enter a PIN on both devices. Comparing this method with the use of NFC for associating and setting has the following advantages: no need to browse through menus or configuration screens; simply bringing two devices closer to each other triggers the relevant software and user interface; after this environment is established, the relevant exchanges will be exchanged automatically. data.


Users only need to confirm the transaction and only need to check the relevant information. This process will reduce the steps required for device association and minimize user interaction. Users do not need to add any overhead to improve security. It also speeds up the connection process while retaining features such as completion/error confirmation and bug fixes. With NFC, pairing of devices such as Bluetooth, Wireless USB, and W-LAN with devices can be made very simple, fast, and intuitive, while at the same time bridging gaps between mobile and consumer electronics.


Fold edit the foreground of this paragraph


NFC is cheap, easy to use and more intuitive, which makes it more potential in some areas - NFC can achieve a variety of devices through a combination of a chip, an antenna and some software Communication within centimeters, and costs only 2 to 3 euros. According to ABI Research's latest research on NFC, the NFC market may originate in mobile handsets. The ABI estimates that by 2005, smart phones and enhanced handheld devices using NFC chips will appear in the market. By 2009, this handheld device will account for more than half of the market. Research firm Strategy Analytics predicts that by 2011 global mobile phone-based contactless payments will exceed 36 billion U.S. dollars.


Folding this paragraph principle


Near Field Communication


NFC-enabled devices can exchange data in active or passive mode. In passive mode, start


The NFC communication device, also referred to as an NFC initiator device (master device), provides an RF-field during the entire communication process, as shown in FIG. It can choose one of the 106kbps, 212kbps, or 424kbps transmission speeds to send data to another device. The other device is called an NFC target device (slave) and does not have to generate a radio frequency field. Instead, it uses a load modulation technique to transmit data back to the initiator at the same speed. This communication mechanism is compatible with contactless smart cards based on ISO14443A, MIFARE, and FeliCa. Therefore, in passive mode, the NFC initiator device can use the same connection and initialization process to detect and establish contact with a contactless smart card or NFC target device. . Figure 1 shows the NFC active communication mode:


Fold edit this paragraph application


NFC devices can be used as contactless smart cards, reader terminals for smart cards, and device-to-device data transmission links. Its wide range of applications, NFC applications can be divided into four basic types:


Contact and finish. For applications such as access control or traffic/activities ticketing, the user simply places the device storing the ticket or access code close to the reader. It can also be used for simple data retrieval applications, such as reading web sites from smart tags on posters.


Contact, confirm. For applications such as mobile payments, the user must enter a password to confirm the transaction or only accept the transaction.


Contact, connection. Linking two NFC-enabled devices allows peer-to-peer network data transmission, such as downloading music, exchanging images, or processing address books synchronously.


Contact, exploration. The NFC device may provide more than one function, and consumers can explore the functions of the device and find out the potential functions and services of the NFC device.


In January 2015, a company in mainland China released an electronic skin thermometer with built-in NFC technology. Users can read temperature data by placing their NFC-enabled mobile phones close to the electronic skin.


Card has launched air card issuance business (referred to as air issuing card) jointly with mobile phone operators. Simply put, as long as the public uses an NFC-compatible mobile phone, they can change to a SIM card with a one-card function in the business office. Then, the portable mobile phone can be "transformed" into a card for recharging, consumption, and transportation. Cars and other functions, citizens do not have to carry an additional card.


Fold edit this paragraph mode


NFC uses two-way identification and connection. NFC mobile phones have three functional modes: NFC mobile phones as reading and writing devices (readers), NFC mobile phones as read devices (card simulation), and point-to-point communication applications between NFC phones.


NFC mobile phone/Tablet PC as a reading device


In this mode, the NFC mobile phone with reading function collects data from the TAG and then processes it according to the requirements of the application. Some applications can be completed locally, while others need to interact with the network.


Based on the typical application of this model: access control or tickets, cinema ticket sales, etc., the user only needs to carry the device storing the ticket or the gating code near the reading device. It can also be used as a simple data acquisition application, such as bus stop site information, park map information, etc.

NFC Tablet PC---4.jpg

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