Japan's NTT DoCoMo said it has recorded a downlink transmission rate of 250 Mbps in a field test of its high-speed Super 3G wireless mobile system.
DoCoMo has been field-testing its experimental Super 3G system using an actual wireless environment near its R&D labs in Yokosuka, south of Tokyo.
The test involves four Multiple-Input Multiple-Output (MIMO) antennas for base-station transmission and mobile-station reception in the 20MHz bandwidth, the maximum under new Super 3G standards.
DoCoMo said it is testing connection handover from one base station to another, also testing applications in indoor and outdoor environments.
Super 3G is DoCoMo's version of Long Term Evolution (LTE), the post-3G roadmap being standardized by the 3rd Generation Partnership Project (3GPP). DoCoMo began work on Super 3G before LTE was formally adopted by the 3GPP, but has since tailored its research to coincide with 3GPP core specs for LTE.
By 2009, DoCoMo expects to complete development of the technologies required for the eventual launch of a Super 3G network.