Bluetooth has always played an important role in smart mobile devices. Connecting devices such as headphones, mice, and speakers via Bluetooth does bring us great convenience, but the application of Bluetooth technology seems to be nothing more than that. Recently, the Bluetooth SIG has updated the Bluetooth standard and released the latest Bluetooth 4.1 standard. What changes in this latest standard mean what it means to users?

Improve data transfer to meet wearable device needs

If Bluetooth 4.0 is the main power saving feature, then the keyword for upgrading Bluetooth 4.1 should be IOT (Internet of Things), which means that all devices are connected to the Internet. To achieve this, improvements to communication capabilities are one of the most important improvements in Bluetooth 4.1.

First and foremost is the transmission speed of bulk data. We know that the transmission rate of Bluetooth has been very slag, which is incomparable compared with WiFi that has already entered Gigabit. So Bluetooth 4.1 has been upgraded on the already widely used Bluetooth 4.0 LE so that bulk data can be transferred at a higher rate. Of course, this does not mean that you can use Bluetooth to transmit streaming video at high speed. This improvement is mainly aimed at the emerging wearable devices. For example, the more common health bracelets, the data stream sent by them is not large, and the information collected during running, swimming, and cycling can be transmitted to the mobile phone and other devices more quickly through Bluetooth 4.1, and the user can It is useful to monitor the state of the movement in real time.

In the Bluetooth 4.0 era, all Bluetooth 4.0 LE-enabled devices have been labeled "Bluetooth Smart" and "Bluetooth Smart Ready." The Bluetooth Smart Ready device refers to a connection center device such as a PC, a tablet, or a mobile phone, and the Bluetooth Smart device refers to an expansion device such as a Bluetooth headset or a mouse. Previously, the roles between these devices were long-arranged, and role swapping was not possible. Only one-to-one connections could be made. In Bluetooth 4.1 technology, the device is allowed to function as both "Bluetooth Smart" and "Bluetooth Smart Ready", which means that multiple devices can be connected to one Bluetooth device. For example, a smart watch can serve as a central hub for receiving sports information collected from a health bracelet while also serving as a display device for displaying emails and text messages from smartphones. With Bluetooth 4.1 technology, smart watches, smart glasses and other devices can become a true central hub.

In addition, the problem that the wearable device is not easy to access the Internet can also be solved by Bluetooth 4.1. The new standard adds a dedicated channel to allow devices to be used over IPv6. For example, if a Bluetooth device cannot access the Internet, then after connecting to a device that can access the Internet via Bluetooth 4.1, the device can directly connect to the network using IPv6 to achieve the same function as WiFi. Although the device's Internet access is limited due to the limitation of the transmission rate, operations such as synchronizing data and sending and receiving emails are completely achievable. The advantage of this improvement is that sensors and embedded devices can connect to mobile phones and connect to the Internet with only Bluetooth. Relatively speaking, WiFi is mostly used to connect to the Internet, and the effect on connecting devices is general, and Bluetooth functions cannot be achieved. In the future, as the Internet of Things gradually enters our lives, wireless transmission will become more and more important in daily life. As the most popular transmission method, Bluetooth will play a role in the "Internet of Things". .

However, it takes longer for Bluetooth to fully adapt to IPv6, so it is necessary to see how chip vendors can help Bluetooth devices increase IPv6 compatibility.

Simplify device connectivity

Driven by major mobile phone manufacturers and PC manufacturers, Bluetooth modules are installed in almost all mobile devices and laptops, and users use Bluetooth more. However, there are still a large number of users who think that Bluetooth is very troublesome to use. In the final analysis, it is caused by the complicated pairing and connection of Bluetooth devices. Imagine if a smart watch connected to a mobile phone has to be manually selected once in the setup interface to reconnect each time it is disconnected, which is very troublesome. The previous solution to this problem was that the manufacturer added NFC chips to both Bluetooth devices and simplified the re-pairing process through NFC near-field communication. This is a good idea. Only the products equipped with NFC chips are not only a small number, but also the price is high, very small.

Bluetooth 4.1 has improved on this point, and has greatly modified the connection and reconnection between devices, which can provide more design permissions for the manufacturer to design, including setting the band to create or maintain Bluetooth connection. With the change, the flexibility of connecting Bluetooth devices has been significantly improved. The two devices with Bluetooth 4.1 have been successfully paired before, and the two devices can be reconnected when reconnecting, without any manual operation. For example, when using Bluetooth 4.1 headphones in the future, just turn on the power switch, you don't need to operate on the phone, it is very simple.

Peaceful coexistence with 4G

In the field of mobile communications, the hottest topic in the near future is 4G, which has become an irreversible trend in global wireless communication networks. Bluetooth 4.1 is also optimized for 4G to ensure that it can coexist peacefully with 4G signals. This improvement is called "coexistence" by the Bluetooth technology alliance. Maybe everyone will be confused, mobile phone network signals and Bluetooth have not coexisted for a long time, why is Bluetooth 4.1 specifically targeted at this improvement? This is because in actual applications, if the two transmit data at the same time, the Bluetooth communication may be interfered by the signal of the mobile phone network, resulting in a decrease in the transmission rate. Therefore, in the new Bluetooth 4.1 standard, once the Bluetooth 4.1 and 4G networks are transmitting data at the same time, Bluetooth 4.1 will automatically coordinate the transmission information of both, thereby reducing the interference of other signals to Bluetooth 4.1, and the user will also Don't worry about the drop in transmission rate.

Bluetooth 4.1 is not far away

According to past experience, after the release of the new Bluetooth standard, it is difficult to have a product without a year and a half. However, this problem does not occur on Bluetooth 4.1, because Bluetooth 4.1 can not only be backward compatible with Bluetooth 4.0, but more importantly, for existing Bluetooth 4.0 devices, there is no need to replace the chip, only need to upgrade the firmware to upgrade To Bluetooth 4.1. This is definitely a benefit for users who can use Bluetooth 4.1 and enjoy new features without having to pay for new equipment. Soon you can see various devices starting to upgrade the Bluetooth firmware in order to support this new standard.

Existing Bluetooth 4.0 devices can be upgraded directly to Bluetooth 4.1

Extended reading: the road to the development of Bluetooth

Bluetooth was originally created by Ericsson and was later set by the Bluetooth Technology Alliance. The name of this wireless technology is taken from the name of the ancient Danish Viking King Harald Blaatand, translated directly into Chinese, it is "Bluetooth".

In 1998, Bluetooth launched version 0.7, which is the first version of Bluetooth and supports two parts, Baseband and LMP.

This was an important year in the history of Bluetooth development in 1999. In the year the Bluetooth Technology Alliance's predecessor special interest group (?? SIG) was established. In the same year, Bluetooth released version 0.8, version 0.9, version 1.0 and version 1.0a, especially the 1.0a released on July 26, which determined to use 2.4GHz spectrum, the highest data transmission speed of 1Mbps, and began large-scale publicity. However, Bluetooth was not widely used at the time, and the price of Bluetooth devices was very expensive.

In 2001, Bluetooth 1.1 was the first official commercial version. Because of its early design, it was easily affected by products of the same frequency and affected the communication quality.

In 2003, Bluetooth 1.2 was introduced. In order to solve the problem of interference, the (Anti-Software) anti-interference frequency hopping function was added.

In 2004, Bluetooth 2.0 was introduced. It is actually an upgraded version of version 1.2. At the same time as the transfer rate is greatly improved, it starts to support the duplex mode—that is, one side for voice communication and also for transmitting data. Since this release, Bluetooth has been widely used.

In 2007, Bluetooth 2.1 was released, and the existing problems were improved, including improving the matching process and reducing power consumption.

Bluetooth 3.0 was officially released in 2009, using a new alternate RF technology and eliminating UMB applications.

The 2010 Trinity Bluetooth 4.0 release includes traditional Bluetooth, Bluetooth low energy and high speed Bluetooth technology. These three specifications can be combined or used separately.

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