Significance of channel failures on network performance in CRNs with reserved spectrum

Balapuwaduge, Indika A. M.; Li, Frank Y.; Pla, Vicent

doi:10.1109/icc.2016.7510891

Cited by 11 publications

(26 citation statements)

References 9 publications

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“…Since the reserved channels can also be occupied, forced terminations of SU services in the non-reserved band may not be decreased adequately [24]. As a solution to this problem, we proposed a static channel reservation (SCR) scheme in [1] which solely targeted on retainability. However, static reservation generally leads to lower channel availability for CRs.…”

Section: A Related Workmentioning

confidence: 99%

“…For this reason, the retainability exhibits always a higher value with mode 1 than with mode 2. Moreover, via SCR with a higher number of reserved channels, it is able to provide higher service retainability than in DCR since the number of channels in the R-CRN is kept fixed and they are exclusively allocated to ongoing services [1]. However, SCR is not flexible and it shows comparatively poorer performance in terms of channel availability, as to be pointed out in the next subsection.…”

Section: B Retainabilitymentioning

confidence: 99%

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Dynamic Spectrum Reservation for CR Networks in the Presence of Channel Failures: Channel Allocation and Reliability Analysis

Balapuwaduge

Pla

2018

IEEE Trans. Wireless Commun.

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Providing channel access opportunities for new service requests and guaranteeing continuous connections for ongoing flows until service completion are two challenges for service provisioning in wireless networks. Channel failures, which are typically caused by hardware and software failures or/and by intrinsic instability in radio transmissions, can easily result in network performance degradation. In cognitive radio networks (CRNs), secondary transmissions are inherently vulnerable to connection breaks due to licensed users' arrivals as well as channel failures. To explore the advantages of channel reservation on performance improvement in error-prone channels, we propose and analyze a dynamic channel reservation (DCR) algorithm and a dynamic spectrum access (DSA) scheme with three access privilege variations. The key idea of the DCR algorithm is to reserve a dynamically adjustable number of channels for the interrupted services to maintain service retainability for ongoing users or to enhance channel availability for new users. Furthermore, the DCR algorithm is embedded in the DSA scheme enabling spectrum access of primary and secondary users with different access privileges based on access flexibility for licensed shared access. The performance of such a CRN in the presence of homogeneous and heterogeneous channel failures is investigated considering different channel failure and repair rates.

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Section: A Related Workmentioning

confidence: 99%

Section: B Retainabilitymentioning

confidence: 99%

Dynamic Spectrum Reservation for CR Networks in the Presence of Channel Failures: Channel Allocation and Reliability Analysis

Balapuwaduge

Pla

2018

IEEE Trans. Wireless Commun.

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“…In addition to that, it is worth mentioning that the PU has the higher privilege than the SU services [5] so, whenever PU arrives the SU will vacate the channel and perform spectrum handover to a reserved channel to resume its unfinished service if an idle channel is available, otherwise, SU will be forced terminated out of the network [6]. Therefore, the channel reservation strategy is applied extensively to allocate some channels for particular users to enhance the efficiency of the system [6], [7]. In the previous literature, the reserved channels are specialized for SUs only as in [2], [8], or PU usage as in [9].…”

Section: Introductionmentioning

confidence: 99%

“…In the previous literature, the reserved channels are specialized for SUs only as in [2], [8], or PU usage as in [9]. Their utilization for both interrupted services of PUs and SUs is adopted in [7], [10]. In our proposed scheme the dynamic channel reservation (DCR) is dedicated to only SUs while preserving the accepted limit of PU channel availability.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, this paper is motivated by using the DCR mechanism in the DSA scheme which adjusts dynamically the optimal number of reserved channels based on the traffic load occupancy by PUs and SUs. Consequently, two algorithms are proposed, one of them concerns the SU retainability and the other focuses on the SU channel availability considering in both algorithms the PU channel availability threshold which cannot be neglected as in [7]. Therefore, this approach provides more accuracy and higher flexibility while sudden PU and SU requests arrive more than stated in [7], [10], [12].…”

Section: Introductionmentioning

confidence: 99%

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Centralized Dynamic Channel Reservation Mechanism via SDN for CR Networks Spectrum Allocation

et al. 2020

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In cognitive radio networks (CRNs), secondary users (SUs) transmission requests are fulfilled via the use of portions of the licensed bandwidth dedicated to primary users (PUs). Meanwhile, through spectrum sharing of dynamic spectrum access (DSA), the PUs gain either financial benefits or cooperative communications. Due to the fact that the spectrum bandwidth resources are restricted hence; the dynamic allocation requests have become the focus of attention in recent years. Therefore, the dynamic channel reservation (DCR) in CRNs has a significant influence on improving network performance via the adjustment of the optimal number of reserved channels. Also, the centralized control (central controller) with a software-defined network (SDN) can be employed effectively to manage configuration, simplify the complexities, and develop dynamic coordination between the users in the network. In this paper, two algorithms of DCR are investigated to determine the optimal number of reserved channels based on SU retainability or SU channel availability while taking into consideration PU's channel availability minimum limit in both cases. Performance metrics in both cases indicate the enhancement in system quality of service (QoS). Moreover, the results show a significant reduction in SU cost function and network unserviceable probability (), while meeting the QoS requirements of PU through a minor inconsiderable impact on its channel availability and throughput compared to other previous models. In this paper, a proposed DCR algorithm is designed for selecting one of the two modes of operation depending on the incoming traffic requests to attain better performance characteristics. INDEX TERMS Cognitive radio networks, Dynamic channel reservation, Software defined network, Retainability, SU cost function.

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Dependability-Based Analysis for Ultra-reliable Communication in Heterogeneous Traffic Cognitive Radio Networks with Spectrum Reservation

Goel

Kulshrestha

2022

Wireless Pers Commun

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Significance of channel failures on network performance in CRNs with reserved spectrum

Cited by 11 publications

References 9 publications

Dynamic Spectrum Reservation for CR Networks in the Presence of Channel Failures: Channel Allocation and Reliability Analysis

Dynamic Spectrum Reservation for CR Networks in the Presence of Channel Failures: Channel Allocation and Reliability Analysis

Centralized Dynamic Channel Reservation Mechanism via SDN for CR Networks Spectrum Allocation

Dependability-Based Analysis for Ultra-reliable Communication in Heterogeneous Traffic Cognitive Radio Networks with Spectrum Reservation

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