DoCoMo Demos Mobile Downloads at 120Mbps using LTE Test Network
Published on: 15th Mar 2009
Note -- this news article is more than a year old.
Fujitsu has announced that, in collaboration with NTT DoCoMo, they have conducted successful field testing for Long term Evolution (LTE), using 4x4 MIMO technology. 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, and 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 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 4x4 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 4x4 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.
Multiple-input, multiple-output. MIMO, a core technology underlying LTE, is a spatial multiplexing technology that uses multiple antennas transmitting/receiving different signals on the same frequency. The 4x4 MIMO which employs four antennae at both the transmitting base stations and receiving mobile station, can dramatically increase wireless communications speeds without increasing frequency width.