Terminology explained: Bluetooth-based personal area networks (蓝牙的个域网) standard.

There are four task groups in the IEEE802.15 working group, which respectively formulate standards suitable for different applications. The four criteria are as follows:

802.15.1 is essentially just a formalized standardized version of the Bluetooth low-level protocol. Most of the standard development work is still being done by the Bluetooth Special Interest Group (SIG), and the results will be approved by the IEEE. The original 802.15.1 standard was based on Bluetooth 1.1, the version used in most Bluetooth devices today. The new version 802.15.1a will correspond to Bluetooth 1.2, which includes some QoS enhancements and is fully backward compatible. Bluetooth is the first standard for low-speed applications, but its market situation is not ideal. One of the reasons is that due to the impact of WiFi (802.11b), the price of WiFi products has dropped significantly, inhibiting Bluetooth in some applications. The advantages. Another reason is that in order to cover more applications and provide QoS, Bluetooth deviates from the original goal of simple design. The complexity makes Bluetooth expensive, and it is no longer suitable for simple applications that require low power and low cost. It also has scalability issues.

802.15.2 is a number of changes to Bluetooth and 802.15.1 designed to mitigate interference with 802.11b and 802.11g networks. These networks all use the 2.4GHz band, and if you want to use both Bluetooth and WiFi, you'll need to use 802.15.2 or other proprietary solutions.

802.15.3, also known as WiMedia, is designed to achieve high speed. Initially it targeted consumer devices such as televisions and digital cameras. Its original version specified rates up to 55Mbit/s, using an 802.11-based but incompatible physical layer. Later, most manufacturers tended to use 802.15.3a, which uses the physical layer of the Ultra Wideband (UWB) Multi-Band OFDM Alliance (MBOA) at rates up to 480Mbit/s. Manufacturers intending to produce 802.15.3a products formed the WiMedia Alliance, whose mission is to test and OEM equipment to ensure conformance to the standard.

802.15.4, also known as ZigBee, is a low-speed short-range wireless personal area network. Its design goals are low power consumption (long battery life), low cost and low speed. The rate can be as low as 9.6Kbit/s