A rate-adaptive MAC protocol for multi-Hop wireless networks
Proceedings of the 7th annual international conference on Mobile computing and networking
Voice over IP performance monitoring
ACM SIGCOMM Computer Communication Review
A power control MAC protocol for ad hoc networks
Proceedings of the 8th annual international conference on Mobile computing and networking
A utility-based power-control scheme in wireless cellular systems
IEEE/ACM Transactions on Networking (TON)
MiSer: an optimal low-energy transmission strategy for IEEE 802.11a/h
Proceedings of the 9th annual international conference on Mobile computing and networking
Energy-efficient surveillance system using wireless sensor networks
Proceedings of the 2nd international conference on Mobile systems, applications, and services
IEEE 802.11 rate adaptation: a practical approach
MSWiM '04 Proceedings of the 7th ACM international symposium on Modeling, analysis and simulation of wireless and mobile systems
Routing in multi-radio, multi-hop wireless mesh networks
Proceedings of the 10th annual international conference on Mobile computing and networking
Hybrid rate control for IEEE 802.11
Proceedings of the second international workshop on Mobility management & wireless access protocols
D-ITG Distributed Internet Traffic Generator
QEST '04 Proceedings of the The Quantitative Evaluation of Systems, First International Conference
Self-management in chaotic wireless deployments
Proceedings of the 11th annual international conference on Mobile computing and networking
SHUSH: Reactive Transmit Power Control for Wireless MAC Protocols
WICON '05 Proceedings of the First International Conference on Wireless Internet
Robust rate adaptation for 802.11 wireless networks
Proceedings of the 12th annual international conference on Mobile computing and networking
Proceedings of the 12th annual international conference on Mobile computing and networking
ATPC: adaptive transmission power control for wireless sensor networks
Proceedings of the 4th international conference on Embedded networked sensor systems
Handling asymmetry in power heterogeneous ad hoc networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Understanding the effect of access point density on wireless LAN performance
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
Understanding the limitations of transmit power control for indoor wlans
Proceedings of the 7th ACM SIGCOMM conference on Internet measurement
Principles and protocols for power control in wireless ad hoc networks
IEEE Journal on Selected Areas in Communications
Practical beamforming based on RSSI measurements using off-the-shelf wireless clients
Proceedings of the 9th ACM SIGCOMM conference on Internet measurement conference
Implication of MAC frame aggregation on empirical wireless experimentation
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Predictable 802.11 packet delivery from wireless channel measurements
Proceedings of the ACM SIGCOMM 2010 conference
POCOSIM: a power control and scheduling scheme in multi-rate wireless mesh networks
UIC'10 Proceedings of the 7th international conference on Ubiquitous intelligence and computing
PIE in the sky: online passive interference estimation for enterprise WLANs
Proceedings of the 8th USENIX conference on Networked systems design and implementation
On the robustness of IEEE 802.11 rate adaptation algorithms against smart jamming
Proceedings of the fourth ACM conference on Wireless network security
On the capacity of rate-adaptive packetized wireless communication links under jamming
Proceedings of the fifth ACM conference on Security and Privacy in Wireless and Mobile Networks
A joint solution for the hidden and exposed terminal problems in CSMA/CA wireless networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Proceedings of the 8th ACM international workshop on Wireless network testbeds, experimental evaluation & characterization
ACM SIGMOBILE Mobile Computing and Communications Review
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Adaptive transmit power control in 802.11 Wireless LANs (WLANs) on a per-link basis helps increase network capacity and improves battery life of Wifi-enabled mobile devices. However, it faces the following challenges: (1) it can exacerbate receiver-side interference and asymmetric channel access, (2) it can incorrectly lead to lowering the data rate of a link, (3) mobility-induced channel variations at short timescales make detecting and avoiding these problems more complex. Despite significant research in rate and power control, state of the art solutions lack comprehensive techniques to address the above problems. In this paper, we design and implement Symphony - a Synchronous Two-phase Rate and Power control system, whose agility in adaptation enables us to systematically address the three problems, while maximizing the benefits of power control on a per-link basis. We implement Symphony in the Linux Madwifi driver, and show that it can be realized on hardware that supports transmit power control with no modifications to the 802.11 MAC, thereby fostering immediate deployability. Our extensive experimental evaluation on a real testbed in an office environment demonstrates that Symphony (1) enables up to 80% of the clients in 3 different cells to settle at 50% to 94% lower transmit power than a per-cell power control solution, (2) increases network throughput by up to 50% across realistic deployment scenarios, (3) improves the throughput of asymmetry-affected links by 300%, and (4) opportunistically reduces the transmit power of mobile clients running VOIP calls by up to 97%, while causing minimum impact on voice quality.