Towards dynamic spectrum access in primary OFDMA systems

Grønsund, Pål; Pham, Hai Ngoc; Engelstad, Paal E.

doi:10.1109/pimrc.2009.5450079

Cited by 16 publications

(12 citation statements)

References 12 publications

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“…1]) or exploring practical OSA scenarios (see [7,Fig. 2] in the context of secondary utilization of GSM spectrum or [20] in the context of secondary IEEE 802.16 resources usage). Our model can be generalized to the case where PU slots are offset in time from SU slots, however, it would require additional analysis of optimal channel access policies, see for example [21], [22], which is beyond the scope of this paper.…”

Section: Microscopic Modelmentioning

confidence: 99%

Performance of Joint Spectrum Sensing and MAC Algorithms for Multichannel Opportunistic Spectrum Access Ad Hoc Networks

Park¹,

Pawełczak²,

Čabric³

2010

IEEE Trans. on Mobile Comput.

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We present an analytical framework to assess the link layer throughput of multichannel Opportunistic Spectrum Access (OSA) ad hoc networks. Specifically, we focus on analyzing various combinations of collaborative spectrum sensing and Medium Access Control (MAC) protocol abstractions. We decompose collaborative spectrum sensing into layers, parametrize each layer, classify existing solutions, and propose a new protocol called Truncated Time Division Multiple Access (TTDMA) that supports efficient distribution of sensing results in "k out of N" fusion rule. In case of multichannel MAC protocols we evaluate two main approaches of control channel design with (i) dedicated and (ii) hopping channel. We propose to augment these protocols with options of handling secondary user (SU) connections preempted by primary user (PU) by (i) connection buffering until PU departure and (ii) connection switching to a vacant PU channel. By comparing and optimizing different design combinations we show that (i) it is generally better to buffer preempted SU connections than to switch them to PU vacant channels and (ii) TTDMA is a promising design option for collaborative spectrum sensing process when k does not change over time

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Section: Microscopic Modelmentioning

confidence: 99%

Performance of Joint Spectrum Sensing and MAC Algorithms for Multichannel Opportunistic Spectrum Access Ad Hoc Networks

Park¹,

Pawełczak²,

Čabric³

2010

IEEE Trans. on Mobile Comput.

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“…For example, during low traffic periods (e.g. during the night), the OFDMA network could be underused for the actual needs resulting in a lower resource occupancy . The aim of this paper is to design a proper MAC technique able to exploit these holes for setting up an independent (secondary) M2M network.…”

Section: System Scenariomentioning

confidence: 99%

“…In the following, we will consider that there are N devices and that the primary network has a percentage p of free resources within each frame. Indeed, it has been shown that, even if depending on the type of data carried on primary OFDMA networks, there is a certain amount of data that remains free within the framing structure . In Table , the parameters used for the protocol analysis are summarised.…”

Section: The Data Aided Cognitive Machine To Machine Medium Access Comentioning

confidence: 99%

“…Differently, the system proposed here considers a cognitive radio environment, where the frequency holes of the primary network are opportunistically exploited to create an independent polling‐based network for M2M communications. Our study is motivated by the awareness that the overall amount of free resources in an OFDMA frame varies during the day without reaching the maximum capacity of the primary network; this has been highlighted in , where the occupancy statistics of an IEEE 802.16 frame are considered as an example. The same occupancy statistics can be considered valid also for Long Term Evolution (LTE) and other OFDMA‐based networks.…”

Section: Introductionmentioning

confidence: 99%

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An M2M cognitive MAC protocol for overlaid OFDMA environments

Tarchi

Fantacci

Marabissi

2015

Trans. Emerging Tel. Tech.

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Machine to machine (M2M) communications have gained in the last years an increasing interest due to ever growing number of machine-type devices that are used in different application fields by allowing low cost and efficient communications among devices mainly in an autonomous manner. Even if M2M protocols need of dedicated resources, a new paradigm called cognitive M2M (CM2M) has been recently introduced in order to exploit cognitive/opportunistic radio communications. The aim of this paper is to outline a CM2M mechanism, where the primary network is based on the orthogonal frequency division multiple access technique, while the M2M communication-based secondary network uses a novel medium access control technique, named data aided cognitive technique (DACT). The performance of the proposed DACT protocol is derived by means of suitable analytical methods under different operational conditions. Analytical predictions are also validated by comparisons with numerical results obtained through computer simulations, in order to show the effectiveness of the proposed solution in terms of throughput, delay, resource wastage and CM2M devices queue length; to this aim, the proposed DACT protocol has been implemented with different alternatives. Among them, an adaptive approach allows to optimise the system performance by increasing the overall throughput while keeping under control the system delay and the resource wastage.

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“…1]) or exploring practical OSA scenarios (see [28,Fig. 2] in the context of secondary utilization of GSM spectrum or [29] in the context of secondary IEEE 802.16 resources usage). Our model can be generalized to the case where PU slots are offset in time from SU slots, however it would require additional analysis of optimal channel access policies, see for example [26], [30], [31], which is beyond the scope of this paper.…”

Section: System Modelmentioning

confidence: 99%

To Buffer or to Switch: Design of Multichannel MAC for OSA Ad Hoc Networks

Park

Pawełczak

Čabrić

2010

2010 IEEE Symposium on New Frontiers in Dynamic Spectrum (DySPAN)

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We present an analytical framework to assess the effectiveness of different combinations of medium access control (MAC) protocols for multichannel opportunistic spectrum access (OSA) ad hoc networks. As a performance metric we focus on average link layer throughput, and investigate dedicated control channel (DCC) and hopping control channel (HCC) MAC protocol abstractions. For DCC and HCC protocol classes we analyze two distinct strategies of managing active secondary user (SU) connection on the event of primary user (PU) arrival: to buffer the connection until PU leaves, or to switch the existing SU connection to a vacant channel. We come to an interesting conclusion: while, intuitively, OSA MAC protocols that support both SU connection buffering and SU connection switching should obtain the highest throughput, due to the channel switching overhead SU connection buffering alone performs better than the rest of the protocol combinations considered.

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Towards dynamic spectrum access in primary OFDMA systems

Cited by 16 publications

References 12 publications

Performance of Joint Spectrum Sensing and MAC Algorithms for Multichannel Opportunistic Spectrum Access Ad Hoc Networks

Performance of Joint Spectrum Sensing and MAC Algorithms for Multichannel Opportunistic Spectrum Access Ad Hoc Networks

An M2M cognitive MAC protocol for overlaid OFDMA environments

To Buffer or to Switch: Design of Multichannel MAC for OSA Ad Hoc Networks

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