Bluetooth (Bluetooth), or Bluetooth, is a new wireless transmission protocol originally created by Ericsson and later standardized by the Bluetooth Special Interest Group. It is said that because the technology is still in its infancy, Bluetooth has been registered in Taiwan as a commercial product with the Chinese translation of "Bluetooth", but according to the meaning of the English language itself, it is still "Bluetooth" that is more appropriate.
History
Bluetooth technology was originally created by Ericsson, and on May 20, 1999, Sony Ericsson, IBM, Intel, Nokia and Toshiba, among other industry leaders, created the Bluetooth Special Interest Group to develop a standard for Bluetooth technology. The name "Bluetooth" came from the nickname of King Harald Gormsson of Denmark in the 10th century. Born into a family of pirates, Harald unified the fragmented Nordic countries and became the king of the Viking Kingdom. Because he liked to eat blueberries, his teeth were often stained blue, and got the nickname "Bluetooth", at that time, blueberries because of the strange color of the reason is considered to be unsuitable for consumption, so the king of the love of innovation has also become a symbol of innovation and the courage to try. 1998, Ericsson wants to unify the standard of wireless communication technology and named "Bluetooth". In 1998, Ericsson wanted to standardize wireless communication technology and named it "Bluetooth".
Recent Developments
A PDA cell phone that is communicating with a wireless headset through the Bluetooth interface is now on the market using version 1.1 of the standard, which is a low-power radio that uses a low-cost microprocessor chip to send and receive information over a short distance (10 to 100 meters).
Bluetooth is used to make wireless connections between different devices, such as connecting a computer and peripherals such as printers, keyboards, etc., or to allow a personal digital assistant (PDA) to communicate with other nearby PDAs or computers. There is a wide selection of Bluetooth-enabled cell phones on the market today that can connect to computers, PDAs, and even to hands-free listening devices.
In fact, according to the standards that have been established, Bluetooth can support even more powerful long-range communications to form a wireless local area network (WLAN). Each Bluetooth device can maintain up to seven simultaneous connections. Each device can be configured to constantly announce its presence to nearby devices in order to establish a connection. Alternatively, connections between two devices can be password-protected to prevent them from being received by other devices.
The standard for Bluetooth is IEEE 802.15, and the Bluetooth protocol operates in the unlicensed ISM band at 2.45 GHz at speeds up to 723.1 kb/s. To avoid interference with other protocols that may be using 2.45 GHz, the Bluetooth protocol divides the band into 79 channels and changes channels up to 1,600 times per second.
Comparing Bluetooth to WiFi is unwarranted, as WiFi is a much faster protocol with greater coverage. While both use the same frequency range, they also require more expensive hardware. Bluetooth is supposed to be used to create a wireless connection between different devices, while WiFi is a wireless LAN protocol. The purpose of the two is different.
Future developments
The Bluetooth Special Interest Group is developing versions 1.2 and 2.0.
Version 1.2
This version is backward-compatible with version 1.1, and its main improvements include:
Anonymization: Masking of the device's hardware address (BD_ADDR) protects the user from identity sniffing attacks and tracking. Hardware anonymization has been possible since version 1.1, but has not been implemented, so this feature is still not available to the average consumer.
Adaptive Frequency Hopping (AFH, Adaptive Frequency Hopping): improves resistance to radio interference by avoiding the use of crowded frequencies in a hopping sequence.
Higher actual transmission speed
The L2CAP layer introduces traffic control and error correction mechanisms
Version 2.0
There's not much clear information on what's coming in version 2.0 yet, but Ericsson's researchers have published a few things:
The inclusion of a "Non-hopping Narrowband Channel" (Non-hopping Narrowband Channel). Non-hopping narrowband channel" has been added.
Because there is no need to exchange answer signals with each device, this channel could be used to broadcast a summary of Bluetooth services from a variety of devices to a huge number of Bluetooth devices simultaneously. The answer signal exchange process currently takes about a second.
Unencrypted information such as real-time public ****transit schedules, basic traffic flow information, and advanced traffic directions can be sent to devices at high speeds.
Higher connection speeds
Multiple speed levels supported
Earlier versions of Bluetooth
Earlier versions of Bluetooth, versions 1.0 and 1.0B, were plagued with problems, with multiple vendors noting that their products were incompatible. At the same time, during the handshaking process between two devices, the Bluetooth hardware's address (BD_ADDR) was transmitted, which could not be anonymized at the protocol level, posing a risk of data leakage that deterred some users.