What is Bluetooth 2.1+EDR?
By Abigael Levitt 2020-01-03 1993 420
At present, the most widely used standard is the Bluetooth 2.0+EDR standard, which was launched in 2004, and a large number of products supporting the Bluetooth 2.0+EDR standard also appeared in 2006. Although the Bluetooth 2.0+EDR standard has made a lot of technical improvements, the problems of complex configuration process and high power consumption of devices continue from the 1.x standard.
In order to improve the current problems of Bluetooth technology, Bluetooth SIG organization (Special Interest Group) launched the Bluetooth 2.1+EDR version of Bluetooth technology.
1. Improve the device pairing process
Because many users will encounter many problems when carrying out Bluetooth pairing between hardware, whether it is a single pairing or permanent pairing, the pairing process and necessary operations are too complicated. In the past, in the connection process, it was necessary to use PIN to ensure the security of the connection. The improved connection method will automatically use a digital password for matching and connection. for example, as long as you choose to connect to a specific device in the mobile phone option, the phone will automatically list the devices that can be used in the current environment after it is determined. and connect automatically.
In terms of short-distance pairing, there is also a NFC (Near Field CoMMunication) mechanism for pairing and communication transmission between two Bluetooth-enabled mobile phones. NFC is a short-range wireless RFID technology that replaces traditional radio transmission based on electromagnetic waves in short-range online applications of 1 to 2 meters. Because the NFC mechanism controls the initial detection of pairing, when the two devices in the range want to pair for transmission, simply click on the mobile phone screen whether to accept online or not. However, in order to apply the NFC function, the system must have a built-in NFC chip or have related hardware functions. Better power saving effect
Adds the function of Sniff Subrating to achieve the purpose of saving power by setting the transmission interval of mutual confirmation signals between the two devices. Generally speaking, when two connected Bluetooth devices enter the standby state, the Bluetooth devices still need to call each other to determine whether they are still online, and of course, because of this, the Bluetooth chip must remain in the working state at all times, even if the other components of the phone have entered hibernation mode.
To improve this situation, Bluetooth 2.1 extends the time interval for mutual confirmation between devices to about 0.5 seconds from 0.1 seconds in the old version, which greatly reduces the workload of Bluetooth chips. it also allows Bluetooth to have more time to sleep completely. According to official reports, after using this technology, the standby time of Bluetooth devices can be effectively increased by more than five times after Bluetooth is turned on. What is a
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