定位技术背景(Location-aware technology) Indoor (Local) Indoor/Outdoor Outdoor (Global) Bluetooth GSM(2G) UWB WiFi ZigBee GPS Intrared UMTS (3G) Personal Wireless Wireless Telecommu- Satellite Area WLAN Ad-Hoc Sensor nication Based Networks Networks Networks Networks Location-Based Services (LBS) Location-based services for a wide range of wireless networks.定位技术背景(Location-aware technology) Location-based services for a wide range of wireless networks