If you have ever wondered why spectrum sharing is such a big innovation, take a look at how U.S. spectrum for communications is presently allocated, as shown in the National Telecommunications and Information Administration frequency allocation chart.
As you can see in this portion of the chart, there is almost no spectrum that is presently not allocated for some uses, and some users. So when new demands arise, such as a need for additional mobile spectrum, something has to give.
The solution in the past has been to reallocate spectrum, moving present users elsewhere in the band. But that takes time and money. Spectrum sharing is a way of opening up existing spectrum for new uses, without the cost and time of moving existing users.
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