Journal ArticleDOI
iMAC: improved Medium Access Control for multi‐channel multi‐hop wireless networks
Megha Maiya,Bechir Hamdaoui +1 more
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TLDR
The evaluation of iMAC shows that it provides significant gains in throughput in comparison with uninformed channel selection, especially when contention for channel bandwidth is neither too low nor too high; intelligent selection of channels by iMAC is necessary to harness available bandwidth resources in the presence of medium levels of contention.Abstract:
Trends in wireless networks are increasingly pointing towards a future with multi-hop networks deployed in multi-channel environments. In this paper, we present the design for iMAC—a protocol targeted at Medium Access Control in such environments. iMAC uses control packets on a common control channel to facilitate a three-way handshake between the sender and the receiver for every packet transmission. This handshake enables the sender and the receiver to come to a consensus on a channel to use for data transmission and also signals to neighboring nodes about the contention on that channel. iMAC then uses a mechanism similar to 802.11 for data communication. Our evaluation of iMAC shows that it provides significant gains in throughput in comparison with uninformed channel selection, especially when contention for channel bandwidth is neither too low nor too high; intelligent selection of channels by iMAC is necessary to harness available bandwidth resources in the presence of medium levels of contention. Copyright © 2011 John Wiley & Sons, Ltd.read more
Citations
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Journal ArticleDOI
Coordinating Secondary-User Behaviors for Inelastic Traffic Reward Maximization in Large-Scale \osa Networks
TL;DR: Efficient coordination techniques that support inelastic traffic in large-scale distributed dynamic spectrum access (DSA) networks are developed and shown to be efficient by enabling users to achieve high rewards, scalable by performing well in systems with a small as well as a large number of users, and distributive by being implementable in a decentralized manner.
Journal ArticleDOI
The impact of stochastic resource availability on cognitive network performance: modeling and analysis
Nadia Adem,Bechir Hamdaoui +1 more
TL;DR: This paper analytically model and analyze the dynamics of the spectrum availability and their impact on the SU's packet delay, and applies the mean residual service time concept to achieve an analytical solution for the queueing delay.
Proceedings ArticleDOI
EM-MAC: An energy-aware multi-channel MAC protocol for multi-hop wireless networks
TL;DR: Simulations results show that EM-MAC reduces energy consumption when compared with iMAC, and saves energy by allowing devices that have not gained access to the medium to switch to doze mode until the channel becomes idle again.
Proceedings ArticleDOI
HybridCache: AI-Assisted Cloud-RAN Caching with Reduced In-Network Content Redundancy
TL;DR: In this article, the authors proposed a hybrid proactive and reactive in-network caching scheme that reduces content access latency and network traffic congestion substantially by first grouping edge cloud devices in clusters and then enabling cooperative caching using LSTM-based prediction.
Proceedings ArticleDOI
OCA-MAC: Opportunistic channel aggregation for wireless ad hoc networks
TL;DR: The investigated scenarios indicate that geographical sparsity and spatial reuse do not necessarily lead to performance improvements of IEEE 802.11 networks and, thus, opportunistic channel aggregation proves to be a strong ally to boost throughput and fairness performance in such scenarios.
References
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Journal ArticleDOI
Cognitive radio: brain-empowered wireless communications
TL;DR: Following the discussion of interference temperature as a new metric for the quantification and management of interference, the paper addresses three fundamental cognitive tasks: radio-scene analysis, channel-state estimation and predictive modeling, and the emergent behavior of cognitive radio.
Journal ArticleDOI
Decentralized cognitive MAC for opportunistic spectrum access in ad hoc networks: A POMDP framework
TL;DR: An analytical framework for opportunistic spectrum access based on the theory of partially observable Markov decision process (POMDP) is developed and cognitive MAC protocols that optimize the performance of secondary users while limiting the interference perceived by primary users are proposed.
Journal ArticleDOI
HC-MAC: A Hardware-Constrained Cognitive MAC for Efficient Spectrum Management
TL;DR: A hardware-constrained cognitive MAC, HC-MAC, is proposed to conduct efficient spectrum sensing and spectrum access decision in ad hoc cognitive radio networks while taking the hardware constraints into consideration.
Proceedings ArticleDOI
White space networking with wi-fi like connectivity
TL;DR: This work presents the design and implementation of Net7, the first Wi-Fi like system constructed on top of UHF white spaces, which incorporates a new adaptive spectrum assignment algorithm to handle spectrum variation and fragmentation, and proposes a low overhead protocol to handle temporal variation.
Proceedings ArticleDOI
C-MAC: A Cognitive MAC Protocol for Multi-Channel Wireless Networks
Carlos Cordeiro,Kiran Challapali +1 more
TL;DR: This paper introduces a novel cognitive MAC (C-MAC) protocol for distributed multi-channel wireless networks that is able to effectively deal with the dynamics of resource availability due to primary users and mitigate the effects of distributed quiet periods utilized for primary user signal detection.