Yeah, that's right. The UMTS standard uses simultaneous connections on two two separate freqencies, the 3GSM 2100 that GSM World referrs to is the 1900/2100 flavor of UMTS. I've seen that also referred to as 1900 UMTS, 2100 UMTS or WCDMA 2000...
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Both Docomo and Softbank use 1900 UMTS, so I don't know what carrier in Japan would have the 1700 band...
I thought it was 2100mhz UMTS / WCDMA
http://www.gsmworld.com/roaming/gsminfo/cou_jp.shtml
Yeah, that's right. The UMTS standard uses simultaneous connections on two two separate freqencies, the 3GSM 2100 that GSM World referrs to is the 1900/2100 flavor of UMTS. I've seen that also referred to as 1900 UMTS, 2100 UMTS or WCDMA 2000...