CDMA ,Wireless Internet Application and GPRS
CDMA ,Wireless Internet Application and GPRS
CDMA
• CDMA is leading second generation air interface CDMA is leading second generation air interface
systems in US and Korea systems in US and Korea
• cdma2000 1xRTT (Radio Transmission Technology) cdma2000 1xRTT (Radio Transmission Technology)
– uses same carrier space as IS uses same carrier space as IS-95 95 cdmaOne cdmaOne (1.25MHz) (1.25MHz)
– pushed by Qualcomm pushed by Qualcomm
– data rates up to 307 kb/s data rates up to 307 kb/s
– 2.5G 2.5G
• cdma2000 3xRTT cdma2000 3xRTT
– competes directly with W competes directly with W-CDMA CDMA
– Multi Carrier Multi Carrier – uses three uses three cdmaOne cdmaOne carrier spaces carrier spaces
– up to 2 Mbps up to 2 Mbps
GPRS GPRS
General Packet Radio Services General Packet Radio Services
• A data networking technology A data networking technology
– high speed mobile data (wireless Internet) high speed mobile data (wireless Internet)
services (up to 170 kbps services (up to 170 kbps - in theory) in theory)
– using the GSM air interface using the GSM air interface
– co co-exists with 2G systems such as GSM and IS exists with 2G systems such as GSM and IS-
136 136
• A stepping stone towards 3G systems for GSM and A stepping stone towards 3G systems for GSM and
IS IS-136 networks (2.5G) 136 networks (2.5G)
Wireless Internet Application Wireless Internet Application
Protocols Protocols
• Wireless systems have various constraints Wireless systems have various constraints
– Small terminal display Small terminal display
– High bit error rate High bit error rate
• High High-level protocols for Internet Access level protocols for Internet Access
specifically for wireless systems are specifically for wireless systems are
required required
• WAP (Wireless Application Protocol) WAP (Wireless Application Protocol)
• iMode iMode
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