Spectrum Leasing in Cognitive Radio Networks: A Survey

Spectrum Leasing in Cognitive Radio Networks: A Survey

Spectrum scarcity and underutilization in wireless networks, arising due to traditional static spectrum allocation, have been of great concern since the past decade. The suboptimal use of spectrum motivates new wireless concepts where unlicensed users opportunistically access licensed spectrum using cognitive radio technology. A cognitive radio can change its operating parameter intelligently i...

Optimal Beamforming for Spectrum Leasing in Cognitive Radio Networks

In this paper, the primary network leases some part of its available resources to cognitive radio (CR) users, with the aim of increasing its achievable data rates. In counterpart, CR users are allowed to exploit the leased resource for their own transmission. By using distributed beamforming among CR nodes, we formulate a beamforming problem so as to optimize the parameters involved in the leas...

Efficient Resource Allocations for Spectrum Leasing in Cognitive Radio Networks

The trust management and nodes roaming are considered in this proposed study, a neighbor can predict the node approximate time to reach the road side unit and it keeps a message copy to transmit the sensor nodes, whenever a node reaches its position the neighbor will transmits the data to the nodes. Trustiness of every node is studied with neighbors existing positions. The nodes that are changi...

Dynamic Spectrum Leasing (DSL): A New Paradigm for Spectrum Sharing in Cognitive Radio Networks

Recently [1] proposed a dynamic spectrum leasing (DSL) paradigm for dynamic spectrum access in cognitive radio networks. In this paper, we formalize this concept by developing a more general game theoretic framework for the dynamic spectrum leasing and by carefully identifying requirements for the coexistence of primary and secondary systems via spectrum leasing. In contrast to hierarchical spe...

A Survey on Spectrum Management in Cognitive Radio Networks