The LTE SAE Trial Initiative (LSTI), a group of LTE suppliers and operators pushing the development of a global LTE ecosystem, is talking about its plans for interoperability to make sure a wide range of LTE devices work on all LTE networks globally. As a first step, a common set of features for Frequency Division Duplex (FDD) and Time Division Duplex (TDD) equipment is being defined to enable interoperability tests between devices and infrastructure. Article [1]
Links:
[1] http://www.telecoms.com/itmgcontent/tcoms/news/articles/20017546596.html;jsessionid=E0E1483C5968D6FFF8ABE4A541C0B0F0