Dedicated Radio Utilization for Spectrum Handoff and Efficiency in Cognitive Radio Networks

Abstract

To perform spectrum handoff, cognitive radio (CR) nodes communicating with each other need to exchange licensed user detection information, i.e., perform spectrum coordination, over a common control channel. The spectrum coordination can be fulfilled either via existing cognitive radio interface with time division or via a separate dedicated radio, i.e., a common control interface (CCI), continuously. CR nodes with CCI can instantly exchange licensed user detection information and cease frame transmission, while spectrum coordination can only be performed after the frame transmission period without CCI. Nevertheless, the impact of CCI incorporation into CR nodes in terms of common performance metrics must be thoroughly assessed to evaluate the worthiness of additional radio cost. In this paper, an analytical framework is presented to assess the impact of CCI incorporation into CR nodes for spectrum handoff. The developed framework enables analyzing potential benefits and disadvantages of employing CCI for spectrum handoff, in terms of achievable delay, energy consumption, spectrum utilization and event estimation performance. Extensive performance evaluations are presented to illustrate the impact of CCI utilization on efficiency of spectrum handoff. The network and communication regimes that would yield having CCI favorable are characterized in terms of spectrum conditions and CR parameters.

Energy efficiency-based joint spectrum handoff and resource allocation algorithm for heterogeneous CRNs

“…For instance, multiple SUs occupying the licensed channel of one PU may have to interrupt their transmission and switch to other channels due to the arrival of the PU. The spectrum handoff problem of multiple SUs has been studied in [7,8]. The authors in [7] assume that the spectrum handoff of SUs should meet the constraint of handoff agility, i.e., SUs are only allowed to switch to their neighboring channels, and then formulate a continuous-time Markov model to analyze the forced termination and blocking probabilities of SUs.…”

“…The authors in [7] assume that the spectrum handoff of SUs should meet the constraint of handoff agility, i.e., SUs are only allowed to switch to their neighboring channels, and then formulate a continuous-time Markov model to analyze the forced termination and blocking probabilities of SUs. In [8], an analytical framework is presented to examine the impact of common control interface (CCI) on the performance of spectrum handoff. The potential benefits and disadvantages of employing CCI for spectrum handoff are analyzed in terms of handoff delay, energy consumption, and spectrum utilization.…”

“…• Spectrum handoff problem or resource allocation problem of SUs in CRNs has been studied independently in [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In this paper, we jointly consider spectrum handoff and resource allocation problem of SUs in heterogeneous CRNs and design a joint optimal strategy for all the SUs in terms of handoff target channel selection and transmit power allocation.…”

Prioritized channel allocation-based dynamic spectrum access in cognitive radio sensor networks without spectrum handoff

“…As SHO requires additional operations (e.g., scanning for open channels, transmitterreceiver handshake, etc. ), CR devices supporting SHO will consume additional energy and also a CR channel controller is needed [15][16][17]. Due to these reasons, there are CRSNs that do not have SHO functionality.…”

A Spectrum Handoff Scheme by Considering the Interference Probability in Cognitive Radio

“…In addition, author relies on multi-agent negotiation to enable cognitive radio terminals switching towards the best available spectrum band [4]. An analytical framework is presented to assess the impact of common control interface incorporation into CR nodes for spectrum handoff [5]. Besides, Wu et.al propose a spectrum handoff scheme based on Recommended Channel Sensing Sequence, which aims to optimize the spectrum handoff delay subject to the sensing reliability and link maintenance constraints [6].…”