Differences:
1, Bluetooth 4.1 improves data transfer and caters to wearable device needs, Bluetooth 4.1 upgrades on the already widely used Bluetooth 4.0 LE, allowing bulk data to be transferred at a higher rate.
2. Bluetooth 4.1 has made significant modifications to the connection and reconnection between devices, providing manufacturers with more design permissions, including the ability to set frequency bands to create or maintain a Bluetooth connection, which changes the flexibility of connecting Bluetooth devices in a very noticeable way.
3. In the new Bluetooth 4.1 standard, once Bluetooth 4.1 and 4G networks are transmitting data at the same time, Bluetooth 4.1 automatically coordinates the transmission of information between the two, thereby reducing interference from other signals on Bluetooth 4.1, and eliminating the need for users to worry about a drop in transmission rates. There are already some products that use Bluetooth 4.1, such as Dakang's Touxl in-car Bluetooth headset.
Extended information:
Bluetooth (?Bluetooth?): is a wireless technology standard that enables short-range data exchange between fixed devices, mobile devices, and building personal networks (using 2.4GHz - 2.485GHz). -2.485 GHz UHF radio waves in the ISM band). Bluetooth technology was originally created by telecommunications giant Ericsson in 1994 as an alternative to the RS232 data line. Bluetooth allows multiple devices to be connected, overcoming the challenge of synchronizing data.
Bluetooth is available in the 2400-2483.5MHz band (including guard bands). This is the worldwide unlicensed (but not unregulated) 2.4 GHz short-range radio band in the Industrial, Scientific and Medical (ISM) band.
Bluetooth uses frequency hopping technology to split the transmitted data into packets, which are transmitted over each of 79 designated Bluetooth channels. Each channel has a bandwidth of 1 MHz. Bluetooth 4.0 uses 2 MHz spacing and can accommodate 40 channels. The first channel starts at 2402 MHz and continues every 1 MHz to 2480 MHz. with Adaptive Frequency-Hopping (AFH), this is typically 1600 times per second.
Effective range is dependent on transmission conditions, material coverage, variations in production samples, antenna configuration, and battery status. Most Bluetooth applications are designed for indoor environments where signal degradation due to wall attenuation and signal reflection can make the range much less than the range specified by the Bluetooth product. Most Bluetooth applications are battery-powered Class 2 devices. Whether the other device is Class 1 or Class 2, the difference in range is not significant because the range is usually dependent on the lower-powered device. In some cases, the effective range of the data chain can be extended when a Class 2 device is connected to a Class 1 transceiver with higher sensitivity and transmit power than a typical Class 2 device. In most cases, however, the sensitivity of the Class 1 device is similar to that of the Class 2 device.
When two Class 1 devices with higher sensitivity and transmit power are connected, the range can be well above the typical level of 100m, depending on the throughput required by the application. Some devices are capable of ranges of up to 1km or more in open environments.
The Bluetooth core specification specifies a minimum range, but technically the range is application-dependent and unlimited. Manufacturers can tailor the range to actual use cases.
Reference:
Baidu Encyclopedia - Bluetooth Technology