A NOVEL TECHNIQUE FOR ENHANCING OVERALL NETWORK EFFICIENCY USING COGNITIVE RADIO

Abstract

Cognitive radio has been considered as a key technology for future wireless communications and mobile computing. Power
heterogeneity is also common in CR networks. The benefits of high-power nodes are the expansion of network coverage and
also have advantages in power and data transmission rate. So, researchers have made efforts to examine these advantages, like
backbone construction i.e., virtual backbone is constructed in a distributed and localized fashion while considering many
incompatible objectives like fast convergence, and low computation cost. Topology control helps in conserving the energy by
either reducing transmission power per node or preserving energy-efficient routes for the entire network. But, the large
transmission range of high power nodes leads to large interference, which reduces the spatial utilization of network channel
resources. Because of different transmission power, unidirectional links will occur in the network. Due to these issues, the
primary user (PU) of the cognitive radio network will go into shutdown condition. To address this issue and to explore the
advantages of high-power nodes, we develop an virtual clustering algorithm to construct a hierarchical network and to eliminate
unidirectional links. To reduce the interference raised by high-power nodes, we develop routing algorithms to avoid packet
forwarding via high-power nodes. The throughput of power heterogeneous cognitive can be severely impacted by high-power
nodes