The FCC has started rulemaking to add unlicensed use of 3.650 to 3.700 GHz: The spectrum would be reserved, it sounds like, for unlicensed wireless ISP point-to-point use to increase their available backhaul bandwidth. Usage would requite cognitive radios to reduce interference with the licensed satellite use of this band. [link via Dewayne Hendricks]
The FCC has some very specific and interesting requirements for use of this band alongside the interference items. (FSS = fixed satellite service earth stations)
Under the central proposal of this Notice, unlicensed devices would be allowed to operate in all, or part, of the 3650 MHz band at higher power levels than usually permitted for unlicensed services, which should enhance the utility of unlicensed devices and services in rural areas.
...Fixed unlicensed devices, for example, would be subject to a professional installation requirement and would be prohibited from being located with a defined protection zone surrounding each FSS earth station. Non-fixed, unlicensed devices would be subject to "listen-before-talk" requirements that would detect the presence of any FSS earth station in the vicinity, and make an appropriate decision of whether to transmit and to make appropriate adjustments to the transmit power.
Unlicensed devices would also be required to emit a standardized identification signal which would possibly provide contact information, as well as location. That signal would allow easy identification of possible sources if interference arises.