Wireless Technology Beyond 3G In Japan. Dave Smith. Technology Evolution. Datarate is the Goal. Requirement 100Mb/s Wide area By 2010 How? USA – WLAN Europe – convergence Japan – new air interface. What are key technologies ?. Telecommunications Council Report 2001 New air interface
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Wireless Technology Beyond 3G In Japan
Datarate is the Goal
2002 c NTT DoCoMo
・ For Seamless Area Coverage, Multi-cell Structure is necessary.
CDMA can achieve the best spectrum efficiency.
・ For High Throughput, Single-cell Structure is suitable because
it can avoid inter-cell interference.
OFDM can achieve the best spectrum efficiency.
- Each scheme is not best in the other cell structure.
- For the flexible area coverage and service deployment with lower cost, both Multi-cell and Single-cell environments should be supported with maximum throughput.
Look for New Wireless Access Scheme
that coversboth environments.
Variable Spreading Factor MC CDMA
Spreading and Scrambling
And the winner is ……..
OFCDMA is MC CDMA. If the spreading factor = 1, MC-CDMA OFDMA.
2001 c NTT DoCoMo
FOMA P2101V /D2101V
64k Real-time Video, Voice,
384k Packet/ i-mode
Voice, 384k Packet/ i-mode,
64k Data, Multi Access