Cooperation and coordination in cognitive networks with packet retransmission

Levorato, Marco; Simeone, Osvaldo; Mitra, Urbashi; Zorzi, Michele

doi:10.1109/itw.2009.5351412

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…In [29], the authors allow primary H-ARQ feedback exploitation by secondary users to realize overlay opportunistic communications. Figure 1 illustrates a typical scenario in our study, where a cognitive radio network is overlaid on top of a primary user network that hosts random transmissions of primary subscribers when needed.…”

Section: Related Workmentioning

confidence: 99%

Improved spectrum access control of cognitive radios based on primary ARQ signals

2012

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Cognitive radio systems capable of opportunistic spectrum access represent a new paradigm for improving the efficiency of current spectrum utilization. In this work, we present a novel cognitive channel access method based on learning from both primary channel transmissions and the receiver ARQ feedback signals. This new sensing-plus-confirmation scheme constitutes a non-trivial generalization of the more traditional "Listen-Before-Talk" (LBT) strategy that merely listens to and yields to primary transmissions regardless of primary receiver responses. Our new method exploits the bi-directional and interactive nature of most wireless communication links to facilitate better opportunistic secondary access while achieving primary receiver protection. By allowing the secondary users to learn from both primary transmissions and the corresponding receiver confirmations, our approach allows secondary cognitive users to exploit critical information that primary receivers regularly send to their transmitters. We show that, by monitoring both primary transmissions and receiver feedback signals, secondary radio access can improve throughput over the traditional LBT while limiting the probability of collision with primary user signals.

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Section: Related Workmentioning

confidence: 99%

Improved spectrum access control of cognitive radios based on primary ARQ signals

2012

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“…In the interweave paradigm, the secondary users opportunistically identify and exploit time and frequency slots left unused by the primary users for their transmissions (the so called white space approach) [3], [7]. In both the approaches, cooperation techniques have been proposed to compensate the interference generated to the primary users by secondary users' transmissions [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

Heat-aware transmission strategies

Levorato

Venkatasubramanian

Dutt

2015

2015 Information Theory and Applications Workshop (ITA)

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Abstracl-A novel framework for the optimization of the transmission/interference strategy of secondary users in cognitive networks is proposed. The framework models the dynam ics of the transmission protocols implemented by the wireless terminals, as well as the dynamics of important characteristics of the transmission circuitry such as on-board heat generation and temperature. By generating interference to the primary user's receiver, and cooperating with primary user's packet delivery, the secondary user biases the statistics of the primary user's packet service. As the activation of the transmission circuitry generates heat, the activity of the secondary user impacts the temporal evolution of the primary user's internal temperature. The framework, based Markov Decision Process theory, enables the optimization of the transmission strategy of the secondary user under constraints on the primary user's average throughput.Numerical results show that the activity of the secondary user is beneficial to the hardware state even when the secondary user only aims at maximizing its achieved throughput.

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“…This strategy, which we call "Listen-BeforeTalk (LBT)", relies on channel sensing to avoid spectrum overlay of simultaneous cognitive and primary transmissions. Much progress has been made in this area, e.g., [1][5]- [16].…”

Section: Introductionmentioning

confidence: 99%

Distributed Control of Multiple Cognitive Radio Overlay for Primary Queue Stability

Lapiccirella

Liu

Ding

2013

IEEE Trans. Wireless Commun.

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Abstract-In this paper, we investigate distributed control of multiple secondary users attempting to access the channel of a high priority primary user. Our aim is to maximize the sum cognitive (secondary) user throughput under the constraint of primary user's queue stability. We consider the effect of primary user link adaptation that allows the primary transmitter (PTx) to adapt its transmission rate in response to the secondary interference-level at the primary receiver (PRx). To control the sum secondary interference to PRx beyond the traditional collision-avoidance paradigm, we propose a novel power-control algorithm for secondary nodes to function. To develop such a distributed algorithm and to improve secondary user adaptability, we allow secondary nodes to monitor primary's radio link control information on the feedback channel. We present practical schemes that approximate the optimum solution without relying on global channel information at each secondary node.

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Cooperation and coordination in cognitive networks with packet retransmission

Cited by 10 publications

References 12 publications

Improved spectrum access control of cognitive radios based on primary ARQ signals

Improved spectrum access control of cognitive radios based on primary ARQ signals

Heat-aware transmission strategies

Distributed Control of Multiple Cognitive Radio Overlay for Primary Queue Stability

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