Japanese mobile operator NTT DoCoMo has recorded a downlink transmission rate of 250 Mbps over a high-speed wireless network in an outdoor test of an experimental Super 3G system for mobile communications. DoCoMo has been field-testing and refining its experimental Super 3G system using an actual wireless environment near its R&D labs in Yokosuka, since February. The test involved four MIMO antennas for base-station transmission and mobile-station reception in the 20 MHz bandwidth. DoCoMo is continuing to test connection handover from one base station to another and the functionality of applications in indoor and outdoor environments. The company expects to complete development of the technologies required for the eventual launch of a Super 3G network by 2009.
