SOFTBANK MOBILE, LTE demonstration test achieves downlink transmission rate up to 70 Mbps

High-speed communication standard that SOFTBANK MOBILE plans to introduce as 3.9-th generation mobile phone "LTE (Long Term Evolution)"In the demonstration experiments, we achieved transmission rates up to approximately 70 Mbps.

Note that this experimental result seems to correspond to the maximum downlink transmission rate of 150 Mbps when the maximum transmission bandwidth is used.

Details are as below.
Achieved a downlink transmission rate of about 70 Mbps in the 1.5 GHz band LTE system demonstration experiment | SOFTBANK MOBILE Corp.

According to this release, SOFTBANK MOBILE has been implementing the "Ubiquitous Special Zone" project from December 2009 in Yahata Higashi-ku, Kitakyushu City, Fukuoka Prefecture. In the field trial experiment of the LTE system using 1.5 GHz band, the transmission band of 10 MHz It seems that we achieved a transmission rate of up to 70 Mbps downlink using the width.

This is the experimental landscape. The experiment was conducted in the passenger car where the receiving equipment was installed.


The experimental system consists of three experimental base stations conforming to the LTE standard specifications, and each of the base station transmission and the mobile station reception uses MIMO (transmission using a plurality of antennas Wireless communication technology that improves speed and transmission quality) transmission was used.

Experimental base station of LTE


Two antennas are housed


This experimental result corresponds to a transmission rate of about 150 Mbps maximum for downlink when communicating using 20 MHz which is the maximum transmission bandwidth of LTE, and compared with the current HSDPA system, 3D video and online game It has been confirmed that it is possible to transmit such rich content in real time and to significantly shorten the transmission delay.

Result of this experiment. Strictly speaking, the downward maximum is 69.573 Mbps.


In addition, "Ring-out base station configuration" in which a plurality of base station apparatuses are concentratedly installed at one place and only the base station antennas are arranged on the roof of the building, and "adjacent base stations cooperatively control and transmit and receive , The installation cost and operation cost of the base station can be reduced and the transmission speed is greatly improved at the boundary between the base stations susceptible to interference It has been confirmed.

By the way, the movie which recorded the state of the experiment is posted on the following link.
Movie | LTE system demonstration experiment at 1.5 GHz band achieves throughput of up to 70 Mbps downlink | SOFTBANK MOBILE Corp.