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Understand NFC in three minutes.

2024-07-21 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > IT Information >

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Shulou(Shulou.com)12/24 Report--

What we are going to talk about today is NFC.

I am sure you will not be unfamiliar with it.

As a convenient communication technology, NFC has been serving everyone silently for many years.

In our lives, we see it from time to time.

For example, subways and buses:

Mobile payment:

But who invented NFC? When was it invented? What technology is it based on? What are the advantages and disadvantages? I believe most of the students are not clear.

Today, I'm going to tell you about--

The birth of NFC NFC, the full name is Near Field Communication, that is, "near-field communication", also known as "short-range wireless communication".

It was born in 2003 and was jointly developed by two mobile device giants, Philips and Sony.

At that time, Philips sent a team to Japan to stay behind closed doors with SONY engineers for three months, and came up with such a big move: NFC.

In 2004, the two giants worked with Nokia to create a NFC forum and began to promote the application of NFC.

Since then, NFC, as a baby, began his difficult process of growing up.

What exactly is NFC? NFC is a short-distance high-frequency wireless communication technology that allows non-contact point-to-point data transmission between electronic devices.

Have you noticed these key words? Short distance, high frequency, non-contact, point-to-point.

When it comes to NFC, we have to talk about its big brother, that is, RFID.

RFID,Radio Frequency Identification, namely radio frequency identification, also known as electronic tag.

As the name implies, RFID works by attaching an RFID circuit containing a RFID radio frequency part and an antenna loop to each item.

After the object carrying the tag enters a specific magnetic field set by man, it will send a signal of a specific frequency, and the reader can get the information that the item has been written before.

It's a bit like the badge hanging around the staff's neck, and you are his supervisor. When he comes into your line of sight, you can know his name, occupation and other information, and you can rewrite the content of his badge.

If RFID is a person wearing a badge to make it easier for others to know him, then NFC means that both people are wearing a badge, and they can change the contents of the badge and change the information received by the other person after seeing each other.

NFC and RFID look very similar at the physical level, but they are actually two completely different areas, because RFID essentially belongs to recognition technology, while NFC belongs to communication technology.

At the beginning of its birth, NFC was compatible with Sony's FeliCaTM standard and ISO14443 AMagi B, which is Philips's MIFARE standard. In the industry, it is referred to as Type A Magi Type B and Type F for short, in which A Magi B is the Mifare standard and F is the Felica standard.

NFC has three modes of operation:

1. Active mode

In active mode, the NFC terminal can be used as a card reader to send out radio frequency fields to identify and read / write other NFC device information.

Active communication mode 2. Passive mode

This mode is just the opposite of the active mode, in which the NFC terminal is simulated as a card, which only responds passively in the radio frequency field emitted by other devices and is read / written.

Passive communication mode 3. Two-way mode

In this mode, both sides of the NFC terminal actively send out radio frequency fields to establish point-to-point communication. This is equivalent to both NFC devices in active mode.

Take passive mode as an example:

The device that initiates NFC communication, also known as the NFC initiating device, provides a radio frequency field (RF-field) throughout the communication process. It can choose one of the transmission speeds of 106kbps, 212kbps or 424kbps to send data to another device.

The other device, called the NFC target device, does not have to generate a radio frequency field, but uses load modulation (load modulation) technology, that is, the data can be transmitted back to the originating device at the same speed.

The communication between the two is realized.

Mobile devices operate mainly in passive mode, which can significantly reduce power consumption and extend battery life.

The development of NFC

After the release of NFC, the two giants can be said to be full of confidence that this is another product that can change the world.

After all, NFC is not only more secure than bluetooth, but also takes less than a tenth of a second to establish a connection. Not to mention the card simulation function of NFC, so that the mobile phone can become a bus card, access card or even a bank card at the same time, it can be said that NFC crushes Bluetooth in all aspects.

But in fact, NFC didn't even take that step of promotion.

Although NFC is more convenient and secure, and its cost is lower than Bluetooth, the way to establish a connection that must be close or even contacted is a deficiency.

Moreover, in terms of file transfer speed, NFC is not satisfactory. Theoretically, the transmission speed of NFC can only reach 868Kbps, while Bluetooth can reach 2.1Mbps.

Japan may be said to be the mother's home of NFC, and it was also the most important promotion area in the early days of NFC.

With the joint promotion of mobile phone manufacturers, merchants, operators and even banks, Japanese mobile phones have already integrated bus card and bank card functions.

But outside Japan, NFC is bleak, especially in Europe, where many developers stay away from NFC because of Nokia's high licensing and server fees and the lack of Nokia's technical support.

NFC is mainly promoted in Asia, although Nokia launched the world's first NFC product, the Nokia 3220, and almost made the NFC a standard mobile phone. However, due to the lack of real practical functions, NFC can only be used as a gimmick and gradually fade out of people's sight.

The rebirth of Nokia 3220NFC now, with the popularity of mobile payments, NFC technology has re-entered the attention of major mobile phone manufacturers.

Compared with the current code scan-payment mode, NFC's contact payment mode is obviously faster and safer, and NFC technology is finally no longer a dragon slaughtering technology.

At present, NFC has the following two major applications:

Card emulation this is one of the earliest functions of NFC.

Allowing mobile phones to be used as bus cards and bank cards can greatly reduce the number of cards needed to travel. However, due to software problems, this feature could not be popularized in the early days.

Now that the feature is finally supported by enough software, mobile phone manufacturers such as Xiaomi, Huawei, Samsung, Nubia, Yijia and Meizu have launched their own APP that can simulate a bus card. Unfortunately, this feature can only be used in a few first-tier cities, and it will take time to popularize.

As for bank card simulation, only Alipay, Samsung Pay,Mi Pay, Huawei Wallet and other App support.

File transfer is similar to mobile phone Bluetooth. After both phones turn on the NFC function, you can connect with the phone close to the phone, and then you can choose to transfer or receive files.

However, as mentioned earlier, NFC is not nearly as fast as Bluetooth, but NFC can be used as a pre-link to Bluetooth.

Nowadays, many cameras and photo printers also transmit pictures quickly through NFC, which is very convenient and fast after all.

NFC function of camera

In addition to the NFC function of the printer, more and more NFC applications are being discovered. For example, shared bikes are now popular.

Mobike and ofo, two major shared bikes, have also released new models that support NFC. Users can skip the code scanning step and unlock the phone directly close to the smart lock, making the user experience better, but at present, this feature still has some limitations.

Samsung Note8 open mobike intelligent lock is restricted by the infrastructure and industrial chain is extremely imperfect, NFC is far from being able to play its full functions.

For example, NFC business cards, make phone calls through NFC tags, visit web sites, and even obtain product information through NFC tags, etc., many functions are still in the stage of research and development and have not come into our lives.

Let's give it a little more time, maybe in the near future, it will usher in its own spring.

This article comes from the official account of Wechat: fresh Jujube classroom (ID:xzclasscom), author: sodium bicarbonate

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