Spectrum handoff scheme based on recommended channel sensing sequence

Wu, Chengyu; Chen, He; Jiang, Lingge

doi:10.1109/cc.2013.6633741

Cited by 14 publications

(5 citation statements)

References 12 publications

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“…Ma et al [ 10 ] proposed a handoff scheme based on POMDP to select the optimal target channel for spectrum handoff according to partially observable channel state information. A recommended channel sequence (RCSS) is generated in [ 25 ] considering non-identical signal-to-noise ratios (SNRs) of the PU signal on different channels. Mishra et al [ 26 ] proposed three channel selection techniques based on different constraints, i.e.…”

Section: Related Workmentioning

confidence: 99%

Energy-Efficient Channel Handoff for Sensor Network-Assisted Cognitive Radio Network

Usman

Khan

Vu-Van

et al. 2015

Sensors

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The visiting and less-privileged status of the secondary users (SUs) in a cognitive radio network obligates them to release the occupied channel instantly when it is reclaimed by the primary user. The SU has a choice to make: either wait for the channel to become free, thus conserving energy at the expense of delayed transmission and delivery, or find and switch to a vacant channel, thereby avoiding delay in transmission at the expense of increased energy consumption. An energy-efficient decision that considers the tradeoff between energy consumption and continuous transmission needs to be taken as to whether to switch the channels. In this work, we consider a sensor network-assisted cognitive radio network and propose a backup channel, which is sensed by the SU in parallel with the operating channel that is being sensed by the sensor nodes. Imperfect channel sensing and residual energy of the SU are considered in order to develop an energy-efficient handoff strategy using the partially observable Markov decision process (POMDP), which considers beliefs about the operating and backup channels and the remaining energy of the SU in order to take an optimal channel handoff decision on the question “Should we switch the channel?” The objective is to dynamically decide in each time slot whether the SU should switch the channel or not in order to maximize throughput by utilizing energy efficiently. Extensive simulations were performed to show the effectiveness of the proposed channel handoff strategy, which was demonstrated in the form of throughput with respect to various parameters, i.e., detection probability, the channel idle probabilities of the operating and backup channels, and the maximum energy of the SU.

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Section: Related Workmentioning

confidence: 99%

Energy-Efficient Channel Handoff for Sensor Network-Assisted Cognitive Radio Network

Usman

Khan

Vu-Van

et al. 2015

Sensors

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“…In Liang et al and Pei et al, 23,24 sensing and throughput optimization problem is analyzed; however, the authors have assumed that if PU is detected, SU should stop transmission and wait until the next frame, which results in throughput loss for SUs. In Chengyu et al, 25 channel sensing delay is reduced by suggesting a proper channel sensing sequence. In a previous study, 26 the authors propose a novel SH strategy that prevents unnecessary handoff operations.…”

Section: Literature Surveymentioning

confidence: 99%

A novel spectrum handoff switching decision scheme for improved performance of secondary users in cognitive radio network

Dey

Misra

2022

Int J Communication

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Spectrum handoff (SH) in the cognitive radio network (CRN) is considered as a key challenging area to enhance the performance of secondary users (SUs) in CRN. If the primary user is detected, the SU may pause and stay on the same channel or may perform SH to another idle channel. An accurate and precise handoff decision improves the overall throughput and quality of experience of end-users. In this paper, we introduce a new SH algorithm and continuous short-sensing strategy to improve the overall throughput of SUs. In addition, we have derived the minimum length of the target channel sequence based on network-specific parameters like desired call dropping probability. Further, an optimum channel search time is obtained to minimize the handoff delay. The simulation result shows that the proposed scheme improves the overall throughput of CRN, and the mean opinion score of different video applications increases by 10%, 4.6%, and 1% for rapid motion, gentle walk, and slight motion types of video applications. In the case of VoIP applications, the maximum simultaneous call is improved by 2 times in the case of G.711, 1.

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“…This initiates the handoff process. Finding a new available channel often requires SU to perform spectrum sensing, making handoff more challenging [162]. • SU 's mobility: Because spectrum availability is location dependent, moving while having an ongoing communication may trigger spectrum handoff, as current channel may no longer be available in SU 's new location [163].…”

Section: Location Information Leakage In Spectrum Mobilitymentioning

confidence: 99%

Location Privacy in Cognitive Radio Networks: A Survey

Grissa

Hamdaoui

Yavuza

2017

IEEE Commun. Surv. Tutorials

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Cognitive radio networks (CRN s) have emerged as an essential technology to enable dynamic and opportunistic spectrum access which aims to exploit underutilized licensed channels to solve the spectrum scarcity problem. Despite the great benefits that CRN s offer in terms of their ability to improve spectrum utilization efficiency, they suffer from user location privacy issues. Knowing that their whereabouts may be exposed can discourage users from joining and participating in the CRN s, thereby potentially hindering the adoption and deployment of this technology in future generation networks. The location information leakage issue in the CRN context has recently started to gain attention from the research community due to its importance, and several research efforts have been made to tackle it. However, to the best of our knowledge, none of these works have tried to identify the vulnerabilities that are behind this issue or discuss the approaches that could be deployed to prevent it. In this paper, we try to fill this gap by providing a comprehensive survey that investigates the various location privacy risks and threats that may arise from the different components of this CRN technology, and explores the different privacy attacks and countermeasure solutions that have been proposed in the literature to cope with this location privacy issue. We also discuss some open research problems, related to this issue, that need to be overcome by the research community to take advantage of the benefits of this key CRN technology without having to sacrifice the users' privacy.

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Spectrum handoff scheme based on recommended channel sensing sequence

Cited by 14 publications

References 12 publications

Energy-Efficient Channel Handoff for Sensor Network-Assisted Cognitive Radio Network

Energy-Efficient Channel Handoff for Sensor Network-Assisted Cognitive Radio Network

A novel spectrum handoff switching decision scheme for improved performance of secondary users in cognitive radio network

Location Privacy in Cognitive Radio Networks: A Survey

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