Abstract

In cognitive radio networks (CRN’s), secondary users must vacate the spectrum when it is reclaimed by the primary users. The author in paper [1] gives us brief view of the topology control problem in CRNs with the objective of minimizing the number of required channels while satisfying conflict-free and bi –channel-connectivity constraints. In paper [2] the author has introduced a new definition of g-bi-connectivity for designing fault tolerant topologies for CRNs. In paper [3], the author has considered a SIC-based topology control framework for exploiting the potential benefits of underlay paradigm in CRN’s. In order to achieve the objective, the author has proposed both centralized topology control algorithm and distributed topology control algorithm. The main aim of these algorithms is to minimize the number of required channels while satisfying conflict-free and bi-channel connectivity constraints. The three technologies are compared in the form of a table.