A Novel Clustering Scheme for Spectrum Sharing in Multi-Hop Ad Hoc Cognitive Radio Networks

One example of a cognitive radio network (CRN) can be used to solve spectrum shortage. In CRN, if these SUs do not cause harmful interference to the PU, a secondary user (SU) without spectrum permission can benefit from spectral opportunities left by the spatial information of the primary user (PU) . For ease of deployment, temporary CRNs are expected to attract future applications of secondary spectrum usage [1]. However, in order to visualize the new revolution of this network, we need to deal with new issues in temporary CRN first.

Point - to - point network, ad hoc network, and multi - hop network. In a truly subdivided world, there is a possibility that conventional "gateways" and "access points" that directly access the Internet may not be available, so flexible network protocols that enable innovation while responding to changing network participants Is required. . Block chain technology is inevitable. For example, a series of endpoints outside the scope of an Internet gateway may be able to locate another mobile endpoint that is nearby.

On some devices, such as laptops, some of the available network connections are displayed as computer-to-computer networks. These networks are point-to-point links between ad hoc mesh networks or computers for small file sharing. The term "ad hoc" may also refer to an unplanned distributed network connection.

A wireless ad hoc network, also called a wireless mesh network or a mobile ad hoc network (MANET), is a wireless network composed of wireless nodes organized in a mesh topology. Each node forwards messages on behalf of the other nodes, and each node performs routing. The ad hoc network can be "self-healing" and it will be transferred automatically, bypassing the node that was powered off. To implement an ad hoc mobile network, various network layer protocols are required, such as distance series distance vector routing, association based routing, ad hoc on - demand distance vector routing, dynamic source routing.