On-demand power management for ad hoc networks

TitleOn-demand power management for ad hoc networks
Publication TypeConference Articles
Year of Publication2003
AuthorsZheng, R., and R. Kravets
Conference NameINFOCOM 2003. Twenty-Second Annual Joint Conference of the IEEE Computer and Communications. IEEE Societies
ISSN Number0743-166X
Keywordsaccess protocols, ad hoc networks, data transmission monitoring, dynamic source routing protocol, energy consumption reduction, IEEE 802.11 MAC protocol, MAC protocol, ns-2 simulator, on-demand power management framework, power control, power management transitions, routing protocols, soft-state timers, telecommunication control, telecommunication network management, wireless LAN CBR traffic
AbstractBattery power is an important resource in ad hoc networks. It has been observed that in ad hoc networks, energy consumption does not reflect the communication activities in the network. Many existing energy conservation protocols based on electing a routing backbone for global connectivity are oblivious to traffic characteristics. In this paper, we propose an extensible on-demand power management framework for ad hoc networks that adapts to traffic load. Nodes maintain soft-state timers that determine power management transitions. By monitoring routing control messages and data transmission, these timers are set and refreshed on-demand. Nodes that are not involved in data delivery may go to sleep as supported by the MAC protocol. This soft state is aggregated across multiple flows and its maintenance requires no additional out-of-band messages. We implement a prototype of our framework in the ns-2 simulator that uses the IEEE 802.11 MAC protocol. Simulation studies using our scheme with the dynamic source routing protocol show a reduction in energy consumption near 50% when compared to a network without power management under both long-lived CBR traffic and on-off traffic loads, with comparable throughput and latency. Preliminary results also show that it outperforms existing routing backbone election approaches.
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