Garcia-Saavedra, Andres and Rengarajan, Balaji and Serrano, Pablo and Camps-Mur, Daniel and Costa-Perez, Xavier (2014) SOLOR: Self-Optimizing WLANs with Legacy-Compatible Opportunistic Relays. IEEE/ACM Transactions on Networking, 23 (5). pp. 1202-1215. ISSN 1063-6692

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Abstract

Current IEEE 802.11 WLANs suffer from the wellknown rate anomaly problem, which can drastically reduce network performance. Opportunistic relaying can address this problem, but three major considerations, typically considered separately by prior work, need to be taken into account for an efficient deployment in real-world systems: 1) relaying could imply increased power consumption, and nodes might be heterogeneous, both in power source (e.g., battery-powered vs. socketpowered) and power consumption profile; 2) similarly, nodes in the network are expected to have heterogeneous throughput needs and preferences in terms of the throughput vs. energy consumption trade-off; and 3) any proposed solution should be backwards-compatible, given the large number of legacy 802.11 devices already present in existing networks. In this paper, we propose a novel framework, Self-Optimizing, Legacy-Compatible Opportunistic Relaying (SOLOR), which jointly takes into account the above considerations and greatly improves network performance even in systems comprised mostly of vanilla nodes and legacy access points. SOLOR jointly optimizes the topology of the network, i.e., which are the nodes associated to each relay-capable node; and the relay schedules, i.e., how the relays split time between the downstream nodes they relay for and the upstream flow to access points. Our results, obtained for a large variety of scenarios and different node preferences, illustrate the significant gains achieved by our approach. Specifically, SOLOR greatly improves network throughput performance (more than doubling it) and power consumption (up to 75% reduction) even in systems comprised mostly of vanilla nodes and legacy access points. Its feasibility is demonstrated through test-bed experimentation in a realistic deployment.

Item Type:	Article
Keywords:	Wireless LAN; 802.11; rate anomaly; relays;
Academic Unit:	Faculty of Science and Engineering > Research Institutes > Hamilton Institute
Item ID:	6958
Identification Number:	https://doi.org/10.1109/TNET.2014.2321975
Depositing User:	Hamilton Editor
Date Deposited:	05 Feb 2016 17:04
Journal or Publication Title:	IEEE/ACM Transactions on Networking
Publisher:	IEEE
Refereed:	Yes
URI:	http://ieeexplore.ieee.org/
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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