NDLI: Leveraging dynamic spare capacity in wireless systems to conserve mobile terminals' energy

Content Provider	ACM Digital Library
Author	Kim, Hongseok De veciana, Gustavo
Copyright Year	2011
Abstract	In this paper, we study several ways in which mobile terminals can backoff on their uplink transmit power in order to extend battery lifetimes. This is particularly effective when a wireless system is underloaded as the degradation in user's perceived quality of service can be negligible. The challenge, however, is developing a mechanism that achieves a good tradeoff among transmit power, idling/circuit power, and the performance customers will see. We consider systems with flow-level dynamics supporting either real-time or best effort (e.g., file transfers) sessions. The energy-optimal transmission strategy for real-time sessions is determined by solving a convex optimization. An iterative approach exhibiting superlinear convergence achieves substantial amount energy savings, e.g., more than 50% when the session blocking probability is 0.1% or less. The case of file transfers is more subtle because power backoff changes the system dynamics. We study energy-efficient transmission strategies that realize energy-delay tradeoff. The proposed mechanism achieves a 35%-75% in energy savings depending on the load and file transfer target throughput. A key insight, relative to previous work focusing on static scenarios, is that idling power has a significant impact on energy-efficiency, while circuit power has limited impact as the load increases.
Starting Page	802
Ending Page	815
Page Count	14
File Format	PDF
ISSN	10636692
DOI	10.1109/TNET.2009.2032238
Volume Number	18
Issue Number	3
Journal	IEEE/ACM Transactions on Networking (TON)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-06-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Energy-efficiency Flow-level dynamics Idling/circuit power Wireless systems
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Networks and Communications Software Computer Science Applications

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Leveraging Dynamic Spare Capacity in Wireless Systems to Conserve Mobile Terminals' Energy

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