The current model of RF Frequency management is to assign frequency bands to groups and applications. This mitigates the problem of interference and controls to some extent the usage of the RF spectrum. In many of the allocated bands, the usage of the alloted spectrum runs from 0.03 to 3%. As spectrum becomes scarce due to a growing use of existing applications and new applications requiring additional bandwidth come on the market, the spectrum access model is coming under scrutiny. A newer Dynamic Spectrum Access Regulatory model is coming into focus. In this model, the spectrum is not allocated but rather users are allowed to make use of a frequency band if they can do so without interfering with other users in that band.
The key conference in this area is the IEEE Dyspan (Dynamic Spectrum Access Network ).
The purpose of the group is
" to expand collective understanding of complex next-generation wireless systems focused on using RF spectrum more efficiently and dynamically. This includes advancing both cutting edge technical and multidisciplinary research as well as practical experience related to building a healthy industry/regulatory ecosystem for the commercialization of smart radio system technologies.
As networks and devices increasingly gain intelligence and "cognitive" capabilities, and as regulators around the world seek to enhance spectrum utilization through exploiting areas such as "white spaces", dynamic decentralized access is becoming one of the most important, but most complex topics in wireless communications development. IEEE DySPAN 2010 will continue investigation of decentralized spectrum access and focus on approaches for highly scalable dynamic optimization of wireless spectrum use. "
There are several initiatives to further the Dynamic Spectrum Access effort. One is the Potential Alliance for World-wide Dynamic Spectrum Access
by the New America Foundation. The group seeks to foster better working relationship between military, consumer, and public-safety groups.