802.15 WPAN (Wireless Personal Area Networks) is standard for wireless network communication in relatively short distance. This standard makes the portable mobile device such as PDA, Laptop, Mobile Phone, MP3 player communicate to other devices with wireless environment.
802.15.1 is developed based on Bluetooth TM v1.1 standard, each SAP(Service Access Point) are defined through SCO, L2CAP, LLC, HCI on RF, Baseband of Bluetooth.

802.15.2 is standard for coexistence of WPAN(802.15) and WLAN(802.11). Generally, because WPAN and WLAN use 2.4GHz ISM Band, the interference between two devices can occur. To solve the problem, IEEE802.15.3 Task Group has developed Coexistence Mechanism.

When WPAN and WLAN devices are in same device, Collaborative method exchanges information needed to coexistence considering data traffic between them and Non-collaborative method consider only channel characteristics of WPAN and WLAN without exchanging information needed to coexistence.

802.15.3 is a standard for relatively high rate transfer(20Mbps above) among WPAN. Also it defines new functions such as low price, low power consumption, QoS guarantee suitable for multimedia application. There are 3 Task Groups, 802.15.3a use UWB as PHY, 802.15.3e aims to reinforced functions related to QoS and 802.15.3i is related to security.

802.15.4 is a standard for relatively low rate transfer(250Kbps below) on the contrary of 802.15.3. But it can last several years with very long lasting battery by minimizing power consumption, so this standard has been developed for sensor network, smart tag, remote control, home automation.

These IEEE802.15 standards define only PHY and MAC. Alliances based on these standards are ZigBee based on 802.15.4 and WiMedia based on UWB. Their activities have increased remarkably to provide ubiquitous environment.