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NTT Docomo Begins Testing LTE Serviceâ€Ž

09 June 2010 15:55 (UTC +04:00)

Baku - APA-Economics. NTT Docomo Inc announced June 8, 2010, that it will start testing a network that is for communication services and uses FDD (frequency division duplex) LTE (Long Term Evolution) in Tokyo.

The company will start operating the network in December 2010. The purpose of the test is to check the quality of communication such as transmission speed and delay, the stability of communication for moving communication devices and so forth.

In the test, NTT Docomo will use the 2GHz band. First, by using a bandwidth of 5MHz, the company will check data communication with a downloading speed of up to 37.5Mbps and an uploading speed of up to 12.5Mbps. Then, it will expand the bandwidth to 10MHz and check data communication with a downloading speed of up to 75Mbps and an uploading speed of up to 25Mbps, Tech-On English reported.

In both of the tests, a 2 x 2 MIMO (multiple input multiple output) system is used for download.

For the LTE network, NTT Docomo will use the existing antennas that were built for the W-CDMA service. But the company replaces the RRE (remote radio equipment) for processing analog signals with RRE that can be used for both W-CDMA and LTE. Also, it adds BBUs (baseband units) for LTE to the existing BBUs.

NTT Docomo started introducing the new RRE in 2009 and the new BBUs in 2010. These measures will minimize the additional costs required to start the LTE service, the company said.