Fujitsu has conducted successful field testing for Long-term Evolution (LTE) in collaboration with NTT DOCOMO using 4×4 MIMO. The testing took place in the Special Ubiquitous Zone, an area of the northern Japanese city of Sapporo in Hokkaido, designated by the Ministry of Internal Affairs and Communications in 2008 as a wireless communications testing area,.
The testing involved prototype LTE base stations developed jointly by NTT DOCOMO, Fujitsu and Fujitsu Laboratories. MIMO technology was employed to yield wireless transmissions in the range of 120 Mbps (using 10 MHz 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 4×4 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 300 Mbps per sector on the downlink (20 MHz band).
The field testing involved LTE transmissions using NTT DOCOMO test stations in Sapporo’s urban environment, assessing the throughput characteristics of 4×4 pre-coding MIMO on the downlink and confirming that a maximum of 120 Mbps (using 10 MHz bandwidth) could be attained over a measured course. This would be equivalent to 240 Mbps throughput using the 20 MHz 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.
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