Today we have to talk about the topic, is NFC.
For it, I believe that everyone will not feel unfamiliar.
As a convenient communication technology, NFC has served a lot of years for everyone.
In our lives, you will see it from time to time.
For example, subway, bus:
Mobile payment:
However, who is invented by NFC? When is invented? What is based on what technology? What are the advantages and disadvantages? I believe that most of my classmates are not clear.
Today, I will talk to you -
NFC birth
NFC, full name is Near Field Communication, ie "near field communication", is also called "close-up wireless communication".
It was born in 2003, jointly developed by Philips and Sony's mobile device giants.
At that time, Philips sent a team to Japan, and the SONY engineer was closed for three months, and she had such a big move, which is NFC.
In 2004, the two giants were together with Nokia, and the NFC Forum was created to start promoting NFC applications.
Since then, the NFC has begun to grow a difficult growth process as a baby.
What is the technology of NFC?
NFC is a short-range high-frequency wireless communication technology that allows non-contact dot pairs to point data transmission between electronic devices.
Taking care of these few keywords? Short distance, high frequency, non-contact, point-to-point.
When I said NFC, I have to talk about its big brother, that is, RFID.
RFID, RADIOFREQUENCYIDENTIFICATION, That is, RFI, and Name Electronic Tags.
As the name suggests, the working principle of RFID is to put a piece of item to an RFID circuit containing the RFID RF portion and antenna loop.
After carrying the tag, after entering the specific magnetic field set, it will send a specific frequency signal, and the reader can obtain information written before the item.
This is a bit like the badge hanging on the neck, and you are his supervisor. When he enters your line of sight, you can know the information of his name career, you can also rewrite the content of his badge.
If the RFID is a person wearing a badge, it is convenient for others. So NFC is two people wearing a badge, and they can change the contents of the other party to any other to change the contents of the other party after seeing the other party.
NFC and RFID look similar in physical levels, but actually two completely different areas, because RFID is essentially identifiable technology, and NFC belongs to communication technology.
At the beginning of NFC, it is compatible with Sony's Felicatm standard, and ISO14443 A, B, which is Philips Mifare standard. In the industry is referred to as Type A, Type B and Type F, where A, B is Mifare standard, f is the Felica standard.
NFC has three working modes:
Active mode
In the active mode, the NFC terminal can be used as a card reader, ejects the NFC device information of the RF field to identify and read / write other.
Active communication mode
2. Passive mode
This mode is just in the active mode. At this time, the NFC terminal is simulated into a card, which is only moved in the RF field emitted in other devices, read / write information.
Passive communication mode
3. Two-way mode
In this mode, both sides of the NFC terminal actively generate radio frequency fields to establish a point-to-point communication. It is equivalent to two NFC devices in active mode.
Take passive mode as an example:
The device that activates NFC communication is also referred to as an NFC initiator, providing a radio frequency field (RF-field) throughout the communication. It can choose 106kbps, 212kbps or 424kbps one of which transmission speeds are sent to another device.
Another device is called an NFC target device, does not have to generate a radio frequency field, and the load modulation technique can be transmitted back to the initiated device in the same speed.
Both achieve communication.
The mobile device mainly operates in passive mode, which can greatly reduce power consumption and extend battery life.
Development of NFC
After publishing NFC, the two giants can be said to be confident, I believe this is another product that can change the world.
After all, NFC is not only more secure than Bluetooth, but also does not need to 0.1 seconds. Don't mention NFC's card mode, let the mobile phone become bus cards, access cards, or even bank cards, can say NFC all aspects of Bluetooth.
But in fact, the step of the NFC promotion did not go out.
Although NFC is more convenient and safe, and the cost is lower than Bluetooth, but the establishment of a close-up or even contact is a short board.
Moreover, NFC is not satisfactory on the file transmission speed. NFC can only reach 868 kbps in the transmission speed, while Bluetooth can reach 2.1 Mbps.
Japan may be said to be NFC's mother's home, and it is also the most important promotion area in early NFC.
Under the joint promotion of mobile phone manufacturers, merchants, operators and even banks, Japan's mobile phones have already integrated public transport card and bank card function.
But outside Japan, NFC is bleak, especially in Europe, due to Nokia's high authorization and server costs, lack of Nokia's technical support, leading to many developers to respect NFC.
NFC is mainly widely promoted in Asia
Although Nokia launched the world's first NFC product-Nokia 3220, almost NFC as a mobile phone standard. But because there is no real practical function, NFC can only be used as a head, gradually fading out of people's sight.
NOKIA 3220
NFC newborn
Today, with the popularity of mobile payments, NFC technology re-entered the sight of major mobile phone manufacturers.
Compared to the current scan code - payment mode, NFC's contact payment mode is obviously faster and safe, and NFC technology is still no longer the skill of Dragon.
Now NFC has the following two major applications:
Card simulation
This is one of the earliest features of NFC.
Let the mobile phone can be used as bus cards and bank cards, which can greatly reduce the number of cards that need to be carried now. However, due to software issues, this feature will not be popular in the early stage.
Now this function has finally got enough software support, Xiaomi, Huawei, Samsung, Nubia, a plus, Meizu and other mobile phone manufacturers have launched exclusive apps that can simulate public transport cards. Unfortunately, this feature can only be used in several first-tier cities, and it takes time to spread.
As for the bank card simulation, there are only several app support such as Alipay, Samsung Pay, Mi Pay, Huawei wallet.
File transfer
Similar to mobile phone Bluetooth, after two mobile phones are turned on, the mobile phone can be connected to the mobile phone, and then the transfer or receive files can be selected.
However, as mentioned above, NFC is far less short as Bluetooth, but NFC can be used as a pre-dated Bluetooth.
Now there are many cameras, photo printers, and the picture is quickly transmitted through NFC, after all, it is very convenient.
Camera NFC function
NFC function of printer
In addition, more and more NFC applications are constantly discovering. For example, a shared bicycle now is now hot.
Two large bicycles supported by Moyai and OFO also released new models that support NFC, users can skip the scan code step, directly close to the smart lock, so that the user's usage experience is better, but the function is still certain Limitation.
Samsung Note8 opens the Moyai smart lock
It is extremely imperfect to be subject to infrastructure and industrial chain, and NFC is far from exerting all its features.
For example, NFC business cards, call the telephone, access the URL, even through the NFC tag, etc., many functions are still in the R & D stage, have not entered our lives.
Let us give it a little more, maybe in the near future, it will usher in our spring.
Our other product:
