reported yesterday that the US FCC has issued a Notice of Proposed Rulemaking (FCC 12-148) that if enacted into law would allocate the 3550-3650 MHz band for use by small-cells. Heralded by industry groups such as Wireless Internet Service Providers Association (WISPA) and the High Tech Spectrum Coalition (whose members include Apple, Alcatel-Lucent, Cisco, Ericsson, Intel, Nokia, Qualcomm, Research in Motion, and Samsung) the rulemaking will implement a dynamic spectrum-sharing architecture similar to that proposed for TV white space users.
Not discussed, but likely to become relevant over time, is the fact that the 3550-3650 MHz band sits right next to the Amateur Radio Service's 3300-3500 MHz allocation. I've been saying for years that amateur radio is very likely to lose this band because it's almost never used. Even here in the Silicon Valley, where hams tend to push the technology envelope, the band lies dormant. I think we're seeing the beginnings of the end for amateur's "ownership" of the 3300 GHz band. If FCC 12-148 moves to law, and the dynamic spectrum sharing model proves to be successful, it's not unlikely that the FCC will move to expand the allocation.
On the other hand this could wind up being a windfall to amateur radio, because dynamic spectrum sharing works both ways. It could be that the amateur radio of the future will leverage spectrum sharing and allow operators to use frequencies currently unavailable. This is more likely to be true in data networks than voice networks, but of course digital voice could also make use of dynamic spectrum sharing.