Spectrum sharing in cognitive radio networks

Abstract

Cognitive radio networks are the next step to tackle scarcity in wireless networks given the increasing demand of radioelectric spectrum where the proposed solution is to share said resource to improve this situation. In the present article, a review of the current state of spectrum sharing in cognitive radio networks. To achieve this purpose, the articles published over the last 4 years on the matter were reviewed including topics such as mobile networks and TV. Some studies and simulations proposed to share the spectrum is shown. The current state of the studies reveals that there has been significant progress in this research area yet it is necessary to continue similar studies and set in motion different schemes.

Pedestrian mobility management for heterogeneous networks

“…To address this issue, significant improvements in the spectral efficiency, robustness, and performance of wireless devices have been achieved through technological and regulatory innovations. Many regulatory agencies around the world have investigated the problems of spectrum scarcity [1]- [5], showing that the demand for spectrum will increase significantly, and pointing out that the major problem is not an insufficient spectrum, but inefficient use of spectrum. On the other hand, to ensure seamless connectivity and access to ubiquitous mobile services, switching from one network to another, is done through an efficient handover mechanism [6]- [13].…”

“…In a heterogeneous environment [4], [8], [10], [13]- [18] involving several static and dynamic parameters, the network selection decision is a critical component and represents a difficult task to make the handover decision for any mobile user. However, A robust solution to the problem of inefficient spectrum use and handover decision-making is cognitive radio technology [1]- [5]. Since cognitive radio can coexist with existing licensed primary users, effective protocols are needed to perform spectrum detection and allocation of an unused spectrum between secondary users.…”