Читать книгу Dynamic Spectrum Access Decisions - George F. Elmasry - Страница 66

The case of designing DSA solutions for a mix of heterogeneous hierarchical MANETs is the best example that can be used to illustrate the reasons for using a hybrid DSA design. Figure 4.1 shows examples of the trade space that can face the design of DSA capabilities. With heterogeneous hierarchical MANETs, there is a need for a centralized spectrum arbitrator and there could be good design reasons for creating local, distributed cooperative and centralized DSA techniques. As Figure 4.1 shows, moving DSA decisions more towards distributed and centralized decision fusion can increase the bird's eye view (the overarching) understanding of the spectrum use map in the entire area of operation. The tradeoff here is the possibility of increasing the DSA control traffic volume and the increase in decision response time. Obviously, there is a trade space and one must be cognizant of the impact of this trade space depending on the specifics of the cognitive networking system under design.

Figure 4.1 Trade space to be considered for hybrid DSA decision fusion.