Technologies | Advantages | Disadvantages | Accuracy |
Ultrasound | -Simple and cheap equipment -Precision measurement possibilities | -The necessity of the establishment of the recipients in every room -Negative influence a high density-tone | -A few centimeters when it is placed frequent enough |
RFID | -The transmitter and receiver don’t need to see each other directly. -Opportunity to work in all types of environments -Fast interactions | -Passive tags have low precision than active tags. -RFID Readers are expensive | 1 - 10 meters (extendable) |
Bluetooth | -Any kind of Bluetooth device can be monitored (cell phone, mp3 player etc.) -Variable reading distance (1 m vicinity) | -Cost effective for large scale installation -Limited bandwidth -Transmission delay. -The possibly of a maximum of seven sub-links corresponds to main connection | 2 - 10 meters |
WLAN (Wi-Fi) | -The possibility of use the infrastructure of IEEE 802.11 -Low cost | -Poor performance for multilayered and very dense areas. -Due to signal reflection and dynamic network structure variable signal strength. | 1 - 3 meters (in range of 50 meters) |
Infrared | -Compact -Low power consumption | -Sensitive to daylight -Receiver and transmitter needs to see each other directly | 5 - 10 meters |