NTT DOCOMO 
is ready to begin testing its LTE network in the Tokyo area, prior to the full-scale launch of extra-high-speed LTE commercial service in December. The LTE network will be verified for speed, latency, stability of inter-cell handover and other conditions required for commercial operation.
DOCOMO said it expects to confirm 5 MHz-bandwidth throughput for 37.5 Mbps downlinks and 12.5 Mbps uplinks, and later 10 MHz-bandwidth throughput for maximum 75 Mbps downlinks and 25 Mbps uplinks in selected test areas.
The 2 GHz network system comprises dual W-CDMA/LTE base stations, LTE core network equipment and LTE-enabled mobile devices. For efficiency, DOCOMO has been installing LTE base-station components on existing W-CDMA 3G base stations. Base stations in DOCOMO’s existing W-CDMA network that already are equipped with dual W-CDMA/LTE remote radio equipment1 can be easily upgraded for LTE service with the addition of an LTE BDE (base station digital equipment).
The LTE devices to be used in the pre-launch operation are equipped for theoretical speeds of 100 Mbps downlinks and 50 Mbps uplinks. Compatibility with W-CDMA will enable seamless handover as the devices move between LTE and W-CDMA service areas in the network. The devices also are compatible with the GSM protocol, which will enable them to be used on LTE/GSM networks in overseas markets.
http://www.ntt.co.jp
- In March 2010, Fujitsu began shipping LTE mobile base station systems to NTT DOCOMO, which plans to launch LTE services in December 2010.
Fujitsu was selected by NTT DOCOMO in October 2006 as a vendor to develop and manufacture the company’s LTE wireless mobile base stations. Since then, the two companies have been jointly developing and evaluating the systems. Fujitsu said LTE, also called Super 3G, should reach transmission rates of up to 150 Mbps downstream and 50 Mbps upstream, in addition to featuring low latency. The new LTE base stations incorporate numerous advanced Fujitsu technologies, such as highly efficient amplifier technology, to make them lightweight, energy-efficient, and high-performance.
