Fuzzy feedback algorithm for the spectral handoff in cognitive radio networks

César Augusto Hernández-Suárez; Luis Fernando Pedraza-Martínez; Enrique Rodríguez de la Colina

doi:10.17533/udea.redin.n81a05

Authors

César Augusto Hernández-Suárez University Francisco Jose de Caldas https://orcid.org/0000-0001-9409-8341
Luis Fernando Pedraza-Martínez University Francisco Jose de Caldas https://orcid.org/0000-0002-0997-6478
Enrique Rodríguez de la Colina Metropolitan Autonomous University https://orcid.org/0000-0003-1696-3349

DOI:

https://doi.org/10.17533/udea.redin.n81a05

Keywords:

cognitive radio, decision making, feedback algorithms, spectrum mobility, vertical handoff

Abstract

This work proposes a feedback algorithm based on a Fuzzy Analytical Hierarchical Process Method (FAHP) to improve decision making for the spectral handoff. We named it Feedback FAHP (FFAHP). To assess the performance level of the developed algorithms, a comparative analysis was made between the proposed FFAHP algorithm and the most relevant spectrum handoff algorithms in the current literature. These algorithms were assessed with the same decision criteria, which are, the probability of channel availability, estimated channel time availability, the signal to interference plus noise ratio and bandwidth. Unlike other related papers, benchmarking was validated through a trace of real spectrum occupation data captured in the frequency band GSM and Wi-Fi, which model the real behavior of primary users. In the validation phase, eight assessment scenarios were proposed to consider, two types of networks: GSM and Wi-Fi, two kinds of applications: real-time and best-effort, two traffic levels: high and low, and five evaluation metrics: number of handoffs, the number of failed handoff, bandwidth, delay, throughput. The results show that the proposed FFAHP Algorithm provides a performance improvement. The FFAHP Algorithm supplies an efficient and effective process for selecting frequency channels. The results indicate that the proposed FFAHP Algorithm provides a performance improvement. The FFAHP Algorithm supplies an efficient and effective method for selecting frequency channels. The results also show that the FFAHP Algorithm has a low average rate of handoffs, an effective use of the bandwidth, low delay and a high level of throughput; all these combined with the fact that the feedback implemented, stabilizes the system avoiding loops with consecutive hops to alternate frequencies.

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Author Biographies

César Augusto Hernández-Suárez, University Francisco Jose de Caldas

Technological Faculty. Department of Systems and Industrial Engineering, Faculty of Engineering, National University of Colombia.

Luis Fernando Pedraza-Martínez, University Francisco Jose de Caldas

Technological Faculty. Department of Systems and Industrial Engineering, Faculty of Engineering, National University of Colombia.

Enrique Rodríguez de la Colina, Metropolitan Autonomous University

Department of Electrical Engineering.

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