"Looking ahead, we see TD-LTE emerging as a more pressing requirement. We've had support for that for some time, and have integrated our software with several chipset vendors. We're seeing demand not only from China, but also from Softbank in Japan and Sprint in the US. The industry has speculated that once Softbank's investment in Sprint USA takes effect there is an opportunity for greater economies of scale through combination of buying power which could make them very influential operators in the TD-LTE market..
TD-LTE is somewhat different from the 3G TDD mode (TD-SCDMA), sharing a common software stack except for the low level Layer 1 and parts of Layer 2. From a deployment perspective, there is at least 80% re-use of our LTE software – we simply turn on the TDD variant within our existing stack. By contrast, 3G TD-SCDMA requires significantly more dedicated software.
China Mobile also continues to want to evolve TD-SCDMA which now has over 100 million active users. Today, Mindspeed is the only silicon vendor with support for both 3G TD-SCDMA and TD-LTE on the same chip and demonstrated this at MWC."
From "Radisys report lessons learnt from recent LTE small cell network deployments," published on Tuesday, 16 April 2013, written by David Chambers