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Fujitsu performs LTE field testing in Japan

Posted: 18 Mar 2009 ?? ?Print Version ?Bookmark and Share

Keywords:LTE? testing field? Japan wireless?

Fujitsu Ltd and Fujitsu Laboratories Ltd have collaborated with NTT DOCOMO Inc. and have conducted successful testing for LTE, a core technology standard for high-speed wireless communications, using 4 x 4 MIMO.

The testing took place in the Special Ubiquitous Zone, an area of the northern Japan city of Sapporo in Hokkaido, designated by the Ministry of Internal Affairs and Communications in 2008 as a wireless communications testing area. The testing used prototypes of the wireless LTE base stations developed jointly by NTT DOCOMO, Fujitsu and Fujitsu Laboratories which, with the use of MIMO technology, resulted in high-speed wireless transmissions in the range of 120Mbit/s (using 10MHz bandwidth) in Sapporo's urban environment.

Fujitsu and Fujitsu Laboratories were selected by NTT DOCOMO in 2006 to be the developer and manufacturer of their wireless LTE base stations. Since then, they have worked together with NTT DOCOMO to develop these technologies using 4 x 4 MIMO, which increases speed and capacity in both transmitting base stations and receiving mobile stations, and the three companies have performed successful tests of a prototype three-sector LTE base station that has a transmission capacity of 300Mbit/s per sector on the downlink (20MHz band).

The field testing involved LTE transmissions using NTT DOCOMO test stations in Sapporo's urban environment, assessing the throughput characteristics of 4 x 4 pre-coding MIMO on the downlink and confirming that a maximum of 120Mbit/s (using 10MHz bandwidth) could be attained over a measured course. This would be equivalent to 240Mbit/s throughput using the 20MHz maximum bandwidth that LTE allows. These tests revealed that the adaptive switching used in MIMO multiplexing was effective in achieving stable throughput in outdoor carrier environments.

Through transmission speeds measuring approximately 35 times that of 3.5G (7.2Mbit/s) and 2.5 times that of fixed optical fiber lines (100Mbit/s), wireless LTE transmission of large volumes of data used in HD videos, as well as in business and everyday life, is now possible.

The results will contribute to Fujitsu's ongoing development of wireless base stations and core network systems, handset technology, and the total LTE commercial network.

Partial results from these tests will be presented jointly by Fujitsu, Fujitsu Laboratories and NTT DOCOMO at the general meeting of the Institute of Electronics, Information, and Communications Engineers on March 17 at Ehime University in Japan.

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