Just when you thought you knew all about 3G, the "forgotten" standard, TD CDMA, keeps up its momentum. There are a couple of variations of this TDD (Time Division Duplex) mode: lower chip rate/bandwidth called TDDSCDMA and a 5 MHz version called TDD CDMA. The former is described in the article below from Siemens, the latter has been quietly rolled out in New Zealand and elsewhere. It is ideal for unpaired spectrum, just like 802.11, but much more bandwidth efficient.
Siemens to develop 3G gear in China. The mobile group of the German company launches a joint venture with China's Huawei to make products based on the upcoming 3G wireless standard. [CNET News.com]
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