The difference between Bluetooth 4.0 and 3.0

Bluetooth, is a support equipment short distance communication (general 10m) radio technology, after recent years of development, we are no longer unfamiliar with it, it is also the current digital products indispensable modules. The advent of Bluetooth technology allows us to connect a variety of devices are no longer bound by a wide range of data lines, such as audio, computers, mice, keyboards, and even cars. This technology is the simplest and easiest way to make wireless short distance communication between two devices, and it simplifies communication between the device and the Internet, which makes data transmission more efficient and faster.

Recently, the Bluetooth Technology Alliance (a Bluetooth SIG) released Bluetooth 4.2 Core technical standards, it is learned that new technologies can enhance privacy protection, speed data transmission speed, so that the equipment through Bluetooth access to the Internet. From the birth of this technology to today, has undergone many updates, let us review the history of Bluetooth technology.

Bluetooth 4.2, which has been updated in 8 versions, 1.1, 1.2, 2.0, 2.1, 3.0, 4.0, 4.1, 4.2, respectively.

Bluetooth 1.1 Standard

1.1 for the earliest version, the transmission rate is about 748~810kb/s, because it is an early design, susceptible to the same frequency of product interference under the influence of communication quality.

Bluetooth 1.2 Standard

1.2 is also only 748~810kb/s transmission rate, but in addition to (improve the Software) anti-jamming frequency hopping function.

Bluetooth 2.0 Standard

The 2.0 is a 1.2 improved version, with a transmission rate of about 1.8m/s~2.1m/s, beginning to support duplex mode-that is, voice communication on one side while transmitting files/high quality images, and 2.0 of course support Stereo operation.

The most widely used is the Bluetooth 2.0+EDR standard, which was launched in 2004, and the number of products supporting Bluetooth 2.0+edr standards also appeared in 2006.

Although the Bluetooth 2.0+EDR standard has made a lot of technical improvements, it is from 1. The problem of the complexity of the configuration process and the large power consumption of the equipment continues to exist in the X standard.

Bluetooth 2.1 Standard

August 2, 2007, the Bluetooth Technology Alliance officially approved the Bluetooth 2.1 version of the specification, that is, "Bluetooth 2.1+edr" for future equipment free to use. and 2.0 version of the product at the same time, still occupy a larger share of Bluetooth market, relatively 2.0 version is mainly to improve the standby time of more than twice times, the technical standards have not changed fundamentally.

Bluetooth 3.0 Standard

April 21, 2009, the Bluetooth Technology Consortium officially promulgated a new generation of standard specification "Bluetooth core Specification version 3.0 High Speed" (Bluetooth kernel Specification version 3.0), The core of Bluetooth 3.0 is "Generic alternate mac/phy" (AMP), a new alternate RF technology that allows the Bluetooth protocol stack to dynamically select the correct RF for any task.

The Bluetooth 3.0 data transfer rate is increased to around 24Mbps (you can call 802.11 wi-Fi for high-speed data transfer when needed). In the transmission speed, Bluetooth 3.0 is Bluetooth 2.0 eight times times, can easily be used for VCR to High-definition TV, PC to PMP, UMPC to the data transmission between the printer, but need both sides to achieve this standard to achieve the function.

Bluetooth 4.0 Standard

The Bluetooth 4.0 specification was officially released on July 7, 2010, and the new version has the greatest significance in low power consumption, while enhancing device compatibility between different OEM vendors, and reducing latency, the theoretical maximum transmission speed is still 24Mbps (ie 3mb/s), the effective coverage range to 100 meters ( The previous version is 10 meters). The standard chip is used by a large number of mobile phones, tablets, such as Apple's New ipad tablet computer, and Apple's iphone 5, the Phantom MX4, HTC one x and other mobile phones with Bluetooth 4.0 features.

Bluetooth 4.1 Standard

Bluetooth 4.1 released on December 6, 2013, and the LTE radio signal if the simultaneous transmission of data, then Bluetooth 4.1 can automatically coordinate the transmission of both information, theoretically can reduce the other signal to Bluetooth 4.1 interference. The improvement is to increase the speed of the connection and more intelligent, for example, reducing the time between the device reconnect, means that if the user out of the Bluetooth 4.1 signal range and disconnected time is not very long, when the user again back to the signal range after the device will automatically connect, the response time than Bluetooth 4.0 shorter. The final improvement is to improve transmission efficiency, if the user connected to a lot of equipment, such as the connection of a number of wearable devices, the information between each other can be immediately sent to the receiving device.

In addition, Bluetooth 4.1 adds more flexibility for developers, and this change has little impact on ordinary users, but it is important for software developers because Bluetooth must be able to support multiple devices simultaneously in order to cope with the emerging wearable devices.

Currently there are fewer handsets to support the standard, and Samsung Galaxy Note4 is one of the most representative.

Bluetooth 4.2 Standard

December 4, 2014, the latest Bluetooth 4.2 standard promulgated, improved data transmission speed and privacy protection, and access to the device will be directly through the IPV6 and 6LoWPAN access to the Internet. Bluetooth signals will not connect to and track user devices under the new standard if they want to connect or track user devices that must be licensed by the user.

Speed is faster, the data transfer speed between two Bluetooth devices is increased by 2.5 times times, because the capacity of the Bluetooth Smart packet is increased, and the amount of data it can hold is about 10 times times that of previous.

The version of Bluetooth is naturally the more advanced the better, considering the transmission distance and power dissipation problem, the latest Bluetooth 4.1 is optimized, but the current market on the Bluetooth 4.1 product is not much, and the mainstream Bluetooth 4.0 products cost-effective, as for Bluetooth 3.0, 2.1 and the following version has lost the value of the purchase.

Conclusion: Bluetooth has many advantages such as perfect encryption, stable transmission process and rich compatible equipment. From the 1.1 version to the 4.2 version, there is a difficult process, blue tooth Bluetooth Bluetooth 2.1+EDR Standard and 4.0 standards are the most common to us, and has been the most widely used. Bluetooth technology with our lives, work, driving, entertainment, multimedia is closely related, through the use of Bluetooth technology products, people can dispense with the troubles of Home Office cable Winding, through the connection of mobile phones to speakers to hold a hands-free conference call, through wireless stereo headphones to listen to audio from the home or other similar streaming music

Bluetooth standard for each generation of upgrades, I believe that the tablet phone and other electronic products are full of attraction. With a higher version of the Bluetooth standard products, it will enhance the overall performance, such as a wider range of pairing, higher transmission speed, more energy-efficient, direct access to the Internet and so on. In addition, I believe that the future application of Bluetooth will be more extensive, more fitting users. But the Bluetooth 4.2 standard release, is still a small version of the update, and did not bring an inflection point, or say a change. If there is still no reform, it is likely to be replaced by a momentum of NFC.