Wireless_Data_Services_In_Cdma2000汇.ppt

Wireless Data Services In Cdma2000 By Mohammed Yousuf Shareef St Id#220326 Introduction Cdma-Code Division Multiple Access. Spread Spectrum technique using Direct Sequence i.e. each data bit is represented (spread) by multiple bits in transmitted signal. Cdma2000-multi carrier mode Cdma It supports data rates both circuit and packet switched of 9.6kbps to 2 Mbps. Operates in wide range of environments Outdoor Mega cells(cells 35km radius) Outdoor macro cells(1-35 km radius) Indoor/outdoor micro cells(1km radius) Indoor/outdoor Pico cells(50-m radius) Contd… Cdma2000 can be deployed in Indoor/Outdoor environment Wireless Local Loops Vehicular Environments Mixed Vehicular Indoor/Outdoor Environments Cdma2000 services support Overlay configuration Backward compatibility to TIA/EIA-95B signaling network Graceful gradual upgrade from 2G to 3 G systems Common channels with an underlay TIA/EIA-95B system during transition periods Contd… CDMA 2000 is a radio and network access system that is part of the IMT-2000 (ITU) specification suite of 3G systems. Goals of IMT-2000:Global Standard. High Speed Packet Data Services: 2Mbps for stationary use. 384kbps for pedestrian use. 144kbps for vehicular use. 3G applications enabled by CDMA 2000: Packet based services like, wireless Internet, e-mail, ecommerce and multimedia, location based services, longer battery life. Evolution Of Wireless Technologies Wireless Technologies 1G Analog based cellular technology Services Voice 2G Digital technologies Services Voice Low rate data 3G Services Voice High Speed Data Evolution Of Wireless Technologies CDMA 2000 enables migration from and seamless backward compatibility to cdmaOne 2G to 3G without fork-lifting the legacy system. CDMA 2000 migration path: CDMA 2000-1X (1xRTT) Currently available. Incorrectly considered 2.5G. First version of CDMA 2000 by Qualcomm. 144kbps data rate and 1.5 times the voice capacity. 1xEV-DO (HDR) Evolution of 1x to provide hi