PSD

Packet Switched Data is a technology where the communication pipe is shared by several users, thus making it very efficient. The data is sent to a specific address with a short delay. Charging is based on the volume of data and not the duration of the connection. PSD is the technology used for data communication across the internet and because it maximizes the use of the network. PSD will eventually be used even for voice communication.
PDP (Packet Data Protocol)
Pico Cell

Mobile Tech Glossary