Task: Code-Division Multiple Access (CDMA)

Code-Division Multiple Access (CDMA) was conceived several decades ago. Recent advances in electronic technology have finally made its implementation possible.

CDMA differs from FDMA because only one channel occupies the entire bandwidth of the link. It differs from TDMA because all stations can send data simultaneously; there is no time sharing.

Packet Switched Connectivity

·         Resources allocated only when data is transferred

·         Same “path” through network can be maintained (but not necessarily)

·         Billing typically dependent on amount of data transferred (or fixed tariffs)

·         GPRS: Theoretically up to 171 Kbits/s, typically 40-50 Kbit/s

Background	Typically automatic download of email, MMS
Interactive	Typically web/WAP-browsing, MMS, games
Streaming	“Network radio”, video streaming, web TV
Conversational	Voice, video conferencing