Comparison between NFC, RFID, infrared and Bluetooth
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Compared with traditional short-range communications such as RFID, infrared, and Bluetooth, near-field communication (NFC) has inherent security and rapid connection establishment. The following is a specific comparison chart
Difference between NFC and RFID
Like RFID, NFC transmits information through electromagnetic induction coupling in the radio frequency part of the spectrum, but there are big differences between the two.
1. NFC is a wireless connection technology that provides easy, secure and fast communication. Its transmission range is smaller than that of RFID. The transmission range of RFID can reach several meters or even dozens of meters. However, due to the unique signal attenuation technology adopted by NFC, compared with RFID, NFC has the characteristics of short distance, high bandwidth and low energy consumption.
2. NFC is compatible with existing contactless smart card technology and has become an official standard supported by more and more major manufacturers.
3. NFC is a short-distance connection protocol that provides easy, secure, fast and automatic communication between various devices. Compared with other connection methods in the wireless world, NFC is a short-distance private communication method.
4. RFID is more widely used in production, logistics, tracking, and asset management, while NFC plays a huge role in access control, public transportation, mobile payment and other fields.
The difference between NFC, infrared and Bluetooth
NFC is superior to infrared and Bluetooth transmission methods. As a transaction mechanism for consumers, NFC is faster, more reliable and much simpler than infrared, and does not require strict alignment to transmit data. Compared with Bluetooth, NFC is oriented to short-range transactions and is suitable for exchanging important data such as financial information or sensitive personal information; Bluetooth can make up for the shortcomings of NFC's insufficient communication distance and is suitable for longer-distance data communication. Therefore, NFC and Bluetooth complement each other and coexist. In fact, the fast and lightweight NFC protocol can be used to guide the Bluetooth pairing process between two devices, which promotes the use of Bluetooth.
NFC near-field payment and short-distance transmission are highly praised by the industry, but why is it still not popular?
The key reason is that NFC is not easy to use. It is counterintuitive and frustrating to users. In daily life, how can ordinary people think that touching a certain place on a mobile phone to another place can realize some functions? Among those who know NFC, how many people know exactly where the NFC area of their mobile phone is? Among them, how many people can accurately align the NFC area of their mobile phone with the identification area? If they can align it skillfully, they can change the identification area to the NFC area of another person's mobile phone? Moreover, some interactive processes using NFC require confirmation from both parties. Have you tried to click the screen to confirm the pairing during the NFC pairing of two mobile phones?
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The answers to this series of questions are the key reasons why NFC has not been widely used. Traditionally speaking, the action of "touching a specific thing with a specific thing" that most people can recognize in daily life is like swiping a bus card. There are two things indispensable here - the card in your hand, and a flat surface that looks like an identification area. The action mode is to aim the card at the identification area, put it there, wait for the confirmation signal, and take it away if it succeeds. This action cannot be complicated - the identification area must be large and conspicuous, otherwise you don't know where to swipe, the card must be smaller than the identification area, otherwise you don't know how to aim, the waiting time cannot be too long, and the confirmation signal must be obvious and easy to recognize.
Even with such a simple operation, you can still observe how many people hold the bus card to the card reader screen, and how many people hear the error message and have no idea what happened. This is the most common action in daily life. The use of mobile phone NFC is much more complicated, and many variables are introduced.
Take the example of mobile phone NFC payment. When many people hold their mobile phones in front of the card machine, the first thing they are confused about is: where is the recognition area? On common payment terminals, the small recognition area only has an NFC logo, and the most conspicuous way is to make it dark yellow. People who have not received knowledge indoctrination cannot recognize it at all.
After finding the identification area, the second confusion comes: the phone is so much bigger than the identification area, where to touch it? People who know will find the identification area on their phone. After finding it, they have to turn the identification area to the side that they can't see and align it with the payment identification area. They have to wait and see the screen prompts to see whether it is aligned. This process is as easy to frustrate as it is. Moreover, how many payment system identification areas are set above the screen? Note that everyone is used to holding the phone from the bottom, and the hand will block the screen and can't see whether the NFC payment is successful.
The payment scenario is still the best scenario for NFC. After all, it provides you with a recognition area that is not big enough but large enough. The operation required is also simple, just wait and check the screen to confirm the information. The use of mobile phones on mobile phones is simply inhumane.
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NFC is still extremely difficult to use, even worse than infrared transmission - just put two mobile phones on the table head to head and click the confirmation button on the screen. At least it can be used. QR code is also much better than NFC - taking pictures with a mobile phone is a step that everyone is familiar with, and taking a QR code just adds some follow-up actions. The whole process has rich and intuitive visual feedback.
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