A bandwidth sharing approach to improve licensed spectrum utilization

Papadimitratos, Panos; Sankaranarayanan, S.; Mishra, Amitabh

doi:10.1109/mcom.2005.1561918

Cited by 84 publications

(53 citation statements)

References 9 publications

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“…In [12], MAC protocols are proposed for an ad hoc secondary network overlaying a GSM cellular network. It is assumed that the secondary transmitter and receiver exchange information on which channel to use through a commonly agreed control channel.…”

Section: Related Workmentioning

confidence: 99%

Joint Design and Separation Principle for Opportunistic Spectrum Access in the Presence of Sensing Errors

Chen

Zhao

Swami

2008

IEEE Trans. Inform. Theory

363

324

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We address the design of opportunistic spectrum access (OSA) strategies that allow secondary users to independently search for and exploit instantaneous spectrum availability. The design objective is to maximize the throughput of secondary users while limiting the probability of colliding with primary users. Integrated in the joint design are three basic components: a spectrum sensor at the physical (PHY) layer that identifies spectrum opportunities, a sensing strategy at the medium access control (MAC) layer that determines which channels in the spectrum to sense, and an access strategy, also at the MAC layer, that decides whether to access based on sensing outcomes that are subject to errors.We formulate the joint PHY-MAC design of OSA as a constrained partially observable Markov decision process (POMDP). Constrained POMDPs generally require randomized policies to achieve optimality, which are often intractable. By exploiting the rich structure of the underlying problem, we establish a separation principle for the joint design of OSA. Specifically, the optimal joint design can be carried out in two steps: first to choose the spectrum sensor and the access strategy to maximize the instantaneous throughput under a collision constraint, and then to choose the sensing strategy to maximize the overall throughput. This separation principle reveals the optimality of myopic policies for the design of the spectrum sensor and the access strategy, leading to closed-form optimal solutions. Furthermore, decoupling the design of the sensing strategy from that of the spectrum sensor and the access strategy, the separation principle reduces the constrained POMDP to an unconstrained one, which admits deterministic optimal policies. Numerical examples are provided to study the design tradeoffs, the interaction between the PHY layer spectrum sensor and the MAC layer sensing and access strategies, and the robustness of the ensuing design to model mismatch. Index TermsOpportunistic spectrum access, partially observable Markov decision process.

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Section: Related Workmentioning

confidence: 99%

Joint Design and Separation Principle for Opportunistic Spectrum Access in the Presence of Sensing Errors

Chen

Zhao

Swami

2008

IEEE Trans. Inform. Theory

363

324

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“…A connection is initiated with the AP when the SU performs spectrum sensing. The sensing is based on primary transmitter energy detection as shown in [19]. This identifies the available free channel if the primary transmitter is not transmitting (white space).…”

Section: Channel Access Mechanismmentioning

confidence: 99%

Performance Analysis of Hybrid MAC Protocol for Cognitive Radio Networks

Фарук¹,

Gumel²,

Oloyode³

et al. 2013

IJCNS

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The rapid growth in demand for broadband wireless services coupled with the recent developmental work on wireless communications technology and the static allocation of the spectrum have led to the artificial scarcity of the radio spectrum. The traditional command and control model (Static allocation) of spectrum allocation policy allows for severe spectrum underutilization. Spectrum allocated to TV operators can potentially be shared by wireless data services, either when the primary service is switched off or by exploiting spatial reuse opportunities. This paper describes a hybrid access scheme based on CSMA/CA and TDMA MAC protocols for use in the TV bands. The approach allows secondary users (SU) to operate in the presence of the primary users (PU) and the OPNET simulation and modelling software has been used to model the performance of the scheme. An analysis of the results shows that, the proposed schemes protect the primary user from harmful Interference from the secondary user. In terms of delay, it was found that packet arrival rates, data rates and the number of secondary users have significant effects on delay.

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“…A variety of different aspects have been studied, e.g. cooperative sensing among multiple cognitive radio terminals [5], [6] or compressed sensing [7]. In [8] a Partially Observable Markov Decision Process (POMDP) is used to derive a class of decentralized cognitive MAC protocols for opportunistic spectrum access networks.…”

Section: B Secondary User Systemmentioning

confidence: 99%

Detection of Spectral Resources in Cognitive Radios Using Reinforcement Learning

Berthold

Schaar

et al. 2008

2008 3rd IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks

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Abstract-Available spectrum for wireless communications is a limited resource which gains importance with the increasing demand for mobile communication services with high data rates. Measurements show, that assigned frequency bands (FBs) are not used efficiently. One approach for increasing the efficiency in spectrum use is the concept of overlay systems, which can be seen as an enabling technology for cognitive radio and dynamic spectrum access by providing frequency agility. In this paper, we propose an approach for the detection of spectral resources based on reinforcement learning, allowing the cognitive radio to select the FBs with the most available resources.

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A bandwidth sharing approach to improve licensed spectrum utilization

Cited by 84 publications

References 9 publications

Joint Design and Separation Principle for Opportunistic Spectrum Access in the Presence of Sensing Errors

Joint Design and Separation Principle for Opportunistic Spectrum Access in the Presence of Sensing Errors

Performance Analysis of Hybrid MAC Protocol for Cognitive Radio Networks

Detection of Spectral Resources in Cognitive Radios Using Reinforcement Learning

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