What is NFC, a wireless communication technology, and what impact does it have on our lives?

ohahaha

What is NFC, a wireless communication technology, and what impact does it have on our lives? [Copy link]

In recent years, NFC has been increasingly used in smart mobile devices. It can be equipped not only on smart phones and smart watches, but also in small smart bracelets. We use it more and more frequently. In addition to being able to swipe subway cards, bus cards, access cards, etc., it is also used by major mobile phone manufacturers as a payment portal to form various "Pay". NFC has undoubtedly brought many conveniences to our lives, but do you know where it came from?

Let's first look at its definition. NFC (Near-filed communication), also known as near-field communication or near-field communication, is a set of communication protocols that allow two electronic devices (one of which is usually a mobile device, such as a smart phone) to communicate within a few centimeters of each other. It is like the electronic ticket smart card of the past, which will allow mobile payments or support such systems. It can also be used in social networks to share contact information, photos, videos or files. Devices with NFC function can act as electronic ID cards and key cards. NFC provides a low-speed connection that is easy to set up, and can also be used to guide more powerful wireless connections.

Tracing back to its origin, NFC evolved from contactless radio frequency identification (RFID), which was jointly developed by Philips Semiconductors, Nokia and Sony in 2004. Its foundation is RFID and interconnection technology. NFC is a short-range high-frequency radio technology that operates at a frequency of 13.56MHz within a distance of 20 cm. Its transmission speed is 106KB/s, 212KB/s or 424KB/s. At present, NFC has passed the ISO/IEC IS 18092 international standard, EMCA-340 standard and ETSI TS 102 190 standard. In addition, NFC has two reading modes: active and passive.

Each complete NFC device can work in three modes: one is card emulation mode, which is equivalent to an IC card using RFID technology, and can replace a large number of IC cards (including credit cards) in card swiping, access control, tickets, etc. This method has a great advantage, that is, the card is powered by the RF field of the contactless card reader, and it can work even if the host device (such as a mobile phone) is out of power; the second is reader mode, that is, it is used as a contactless card reader, such as reading relevant information from posters or exhibition information electronic tags. For example, Xiaomi launched such an NFC card a long time ago; the last one is point-to-point mode, which is similar to infrared and can be used for data exchange, but the transmission distance is shorter, the transmission creation speed is faster, the transmission speed is also faster, and the power consumption is low. Connecting two devices with NFC function can realize point-to-point data transmission, such as downloading music, exchanging pictures or synchronizing device address books. Through NFC, multiple devices such as digital cameras, PDAs, computers and mobile phones can exchange information or services.

NFC has been widely used since smartphones. The first smartphone to use NFC was the Nokia 6131 released in 2006. The first smartphone to be equipped with NFC was the Android phone Nexus S released in 2010. The first Apple phone to support NFC was the iPhone 6 released in 2014.

NFC is also a short-range communication technology, and is often compared with Bluetooth. Relatively speaking, NFC's transmission speed and distance are not as good as Bluetooth (less than 20cm), but NFC can reduce unnecessary interference, which makes NFC particularly suitable for use when devices are densely packed and transmission becomes difficult. In addition, compared with Bluetooth, NFC has lower energy requirements, similar to the Bluetooth V4.0 low-power protocol. Therefore, NFC is more convenient to use for mobile phones or consumer electronics. NFC's short-range communication characteristics are its advantages. Due to its low power consumption and connection to only one machine at a time, it has high confidentiality and security. NFC is helpful in preventing credit card transactions from being stolen. The goal of NFC is not to replace other wireless technologies such as Bluetooth, but to complement each other in different occasions and fields.

Therefore, after the rise of mobile payment, payment methods relying on NFC functions have gradually become popular, such as using it to swipe subways, buses, access control, etc. It can also be used by mobile phone manufacturers to develop their own payment portals, such as ApplePay, MiPay, OPPOPay, etc. In addition, some manufacturers have further improved its connectivity and acted on the interconnection of multiple devices. For example, Huawei uses the NFC function to allow smartphones, tablets, laptops, TVs, etc. to connect with one touch, facilitating multi-terminal collaboration. There were even rumors that NFC can also be used for wireless charging technology. I believe that in the future, NFC will be used in more scenarios.

w494143467

NFC has now captured a large market and has many applications in business and life. The company is currently also researching its use in this area.

alan000345

Very well written