(Telecompaper) Japanese mobile operator NTT Docomo's subscribers to Xi, its LTE mobile service offering a maximum downlink of 100 Mbps, surpassed 10 million on 18 February. Docomo continues to expand LTE coverage and raise data transmission speeds, including by making the 112.5 Mbps downlink available in 22 cities by March and more than 50 cities by June. LTE base stations offering a 75 Mbps downlink, double the current speed in many locations, will amount to 4,000 by March and then jump to 10,000 by June. Docomo also plans to introduce a 150 Mbps downlink service before March 2014.