Step 2: Log in to mobile QQ and confirm that QQ wallet and savings card are bound.
Step 3: Slide the wuhan tong up and down on the back of the phone, QQ will pop up later, and then click QQ to recharge the selected amount.
Explanation:
NFC, near field communication. This is a wireless technology initiated by Philips and jointly promoted by famous manufacturers such as Nokia and Sony.
Background:
Many companies, universities and users have established the Pan-European Union, and they are all developing the open architecture of NFC and promoting its application in mobile phones. NFC is developed from the integration of contactless radio frequency identification (RFID) and internet technology. It integrates the functions of sensor card reader, sensor card and point-to-point on one chip, and can identify and exchange data with compatible devices in a short distance. This technology was originally a simple combination of RFID technology and network technology, but now it has evolved into a short-distance wireless communication technology, and its development trend is quite rapid.
Like RFID, NFC information is transmitted through electromagnetic induction coupling in the radio frequency part of the spectrum, but there are still great differences between them. First of all, NFC is a wireless connection technology, which can provide simple, safe and fast communication. Its transmission range is smaller than RFID, which can reach several meters or even dozens of meters. However, due to its unique signal attenuation technology, NFC has the characteristics of short distance, high bandwidth and low energy consumption compared with RFID. Secondly, NFC is compatible with the existing contactless smart card technology and has become a formal standard supported by more and more major manufacturers.
Principle:
NFC-enabled devices can exchange data in active or passive mode. In passive mode, the device that starts NFC communication is also called NFC initiator (master device), which provides RF field during the whole communication process, as shown in Figure 2. It can choose the transmission speed of 106kbps, 2 12kbps or 424kbps to send data to another device. The other device is called NFC target device (slave device), which does not need to generate RF field, but uses load modulation technology, that is, it can send data back to the initiating device at the same speed. This communication mechanism is compatible with contactless smart cards based on ISO 14443A, MIFARE and FeliCa. Therefore, the NFC initiator can detect the contactless smart card or NFC target device and establish contact with it in the same connection and initialization process as in the passive mode.
Application:
NFC devices can be used as contactless smart cards, card reader terminals of smart cards and device-to-device data transmission links. It is widely used, and NFC applications can be divided into four basic types:
Contact and complete. For applications such as access control or traffic/activity ticket inspection, users only need to put the device with the ticket or access control code near the card reader. It can also be used in simple data retrieval applications, such as reading web addresses from smart tags on posters.
Contact and confirm. For applications such as mobile payment, users must enter a password to confirm the transaction, or just accept the transaction.
Contact. Contact. Linking two NFC-enabled devices can realize peer-to-peer network data transmission, such as downloading music, exchanging images or synchronously processing address books.
Contact and explore. NFC devices may provide more than one function, and consumers can explore the functions of devices and understand the potential functions and services of NFC devices.
On June 20 15, a domestic company released an electronic skin thermometer. This kind of electronic skin has built-in NFC technology, and users can read the temperature data simply by placing the NFC-enabled mobile phone near the electronic skin.
All-in-one card and mobile phone operators jointly launched the air card issuing service. Simply put, as long as citizens use NFC-compatible mobile phones, they can go to the business hall to replace SIM cards with smart card functions. Then, the mobile phones they carry with them can be transformed into smart cards to realize functions such as recharging, spending and riding, and citizens do not need to carry extra smart cards when going out.