Unavailability of new spectrum is the major temporary barrier, though there are other impediments as well. Spectrum caps will fragment bands and could prevent the full spectral-efficiency benefits that can be derived from large LTE channel widths of 20MHz or more.
HSPA-based technologies are continuously being improved to include many of the same capabilities that are in LTE and spectrum refaming in the 900 MHz band will be mainly with HSPA.
Whereas the U.S. auctioned off its 700MHz digital dividend spectrum- which became available with the switch from analogue to digital TV- in early 2008, Europeans have mostly yet to decide how to allocate their 800MHz digital dividend spectrum.
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