Proceedings ArticleDOI
IEEE 802.11 DCF MAC protocol for cognitive radio networks: Cooperative basic access Vs RTS/CTS
Bhasker Dappuri,T. G. Venkatesh +1 more
- pp 45-50
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TLDR
The role of control/status channel in MAC protocol of cognitive radio networks is studied and different metrics like throughput, mean delay, dropped packets etc of secondary users are calculated and compared through extensive simulation.Abstract:Â
In this paper we study the role of control/status channel in MAC protocol of cognitive radio networks. To this end we consider three channel access schemes of IEEE 802.11 DCF namely (i) the Basic Access mechanism that uses no control channel and (ii) RTS-CTS mechanism, that uses a control channel for contention and (iii) cooperative Basic Access scheme that uses a dedicated channel for status update. We calculate and compare different metrics like throughput, mean delay, dropped packets etc of secondary users through extensive simulation.read more
Citations
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Proceedings ArticleDOI
Performance analysis of a novel decentralised MAC protocol for cognitive radio networks
TL;DR: The design and implementation of a novel Medium Access Control (MAC) protocol for decentralised CRNs (MCRN) that provides efficient utilisations of the unused licensed channels and enables CUs to exchange data successfully over licensed channels is presented.
Patent
Media access control for license-assisted access
TL;DR: In this paper, the authors describe a system for receiving communications at a receiving node that communicates with a transmitting node over a first communication channel and a second communication channel, and determine at the receiving node whether the second channel is available for reception of the data.
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Frame Transmission Efficiency-Based Cross-Layer Congestion Notification Scheme in Wireless Ad Hoc Networks.
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Journal ArticleDOI
Design and Performance Analysis of Cognitive WLAN MAC Protocol
Bhasker Dappuri,T. G. Venkatesh +1 more
TL;DR: This work proposes a MAC protocol for cognitive wireless local area network (WLAN) that allows an unlicensed secondary user (SU) to opportunistically access and transmit data on the licensed channel owned by the primary user (PU).
Proceedings ArticleDOI
Reinforcement Learning Based Safety Message Broadcasting in Vehicular Networks
Xiaosha Chen,Supeng Leng,Fan Wu +2 more
TL;DR: Simulation results show that the proposed algorithms decrease the delays of safety message broadcasting in different scenarios and can provide the fairness among vehicles in terms of channel access opportunity.
References
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NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
TL;DR: The novel functionalities and current research challenges of the xG networks are explained in detail, and a brief overview of the cognitive radio technology is provided and the xg network architecture is introduced.
Journal ArticleDOI
A Survey of Dynamic Spectrum Access
Qing Zhao,Brian M. Sadler +1 more
TL;DR: An overview of challenges and recent developments in both technological and regulatory aspects of opportunistic spectrum access (OSA) is presented, and the three basic components of OSA are discussed.
Journal ArticleDOI
Cooperative Communications for Cognitive Radio Networks
K. Ben Letaief,Wei Zhang +1 more
TL;DR: The use of cooperative spectrum sensing in cognitive radio systems to enhance the reliability of detecting primary users and a cognitive space-time-frequency coding technique that can opportunistically adjust its coding structure by adapting itself to the dynamic spectrum environment are considered.
Journal ArticleDOI
Cross-Layer Based Opportunistic MAC Protocols for QoS Provisionings Over Cognitive Radio Wireless Networks
TL;DR: The Markov chain model and the M/GY/1-based queueing model are developed to characterize the performance of the proposed multi-channel MAC protocols under the two types of channel-sensing policies for the saturation network and the non-saturation network scenarios, respectively.
Journal ArticleDOI
A Survey on MAC Strategies for Cognitive Radio Networks
TL;DR: The fundamental role of the MAC layer is shown and its functionalities in a cognitive radio (CR) network are identified and a classification of cognitive MAC protocols is proposed and advantages, drawbacks, and further design challenges of Cognitive MAC protocols are discussed.