NTT DoCoMo testing out 300 Mbps “Super G” service in Japan

Posted by Humphrey Cheung

Tokyo (Japan) – Rev up those mobile phones because Japan’s NTT DoCoMo is testing out “Super G” cellular service in Tokyo that can hit up to 300 Mbps speeds.  The new service should be available in 2009 and will be approximately 100 times faster than the current 3G network.

NTT DoCoMo is dubbing this new network Super G or 3.9G and predicts that it will give a “smooth transition” to 4G in the future.  Tests will initially be quite modest and will be confined to single base station and phone pairings, but will eventually graduate to multiple base stations doing hand offs.  Eventually both the stations and client side units will use four MIMO antennas each to speed data along at up to 80 Mbps upload and 300 Mbps download.

Super G uses several frequency bands including 1.4, 3, 5, 10, 15 and 20 MHz while regular 3G in Japan uses just the 5 MHz band.  Regular 3G is also much slower at 384 Kbps up and downlink.  Some parts of Japan currently have 3.5G service which tops out at 5.7 Mbps uplink and 14 Mbps downlink.