Abstract
This paper presents Span, a power saving technique for multi-hop ad hoc wireless networks that reduces energy consumption without significantly diminishing the capacity or connectivity of the network. Span builds on the observation that when a region of a shared-channel wireless network has a sufficient density of nodes, only a small number of them need be on at any time to forward traffic for active connections. Span is a distributed, randomized algorithm where nodes make local decisions on whether to sleep, or to join a forwarding backbone as a coordinator. Each node bases its decision on an estimate of how many of its neighbors will benefit from it being awake, and the amount of energy available to it. We give a randomized algorithm where coordinators rotate with time, demonstrating how localized node decisions lead to a connected, capacity-preserving global topology. Improvement in system lifetime due to Span increases as the ratio of idle-to-sleep energy consumption increases, and increases as the density of the network increases. For example, our simulations show that with a practical energy model, system lifetime of an 802.11 network in power saving mode with Span is a factor of two better than without. Span integrates nicely with 802.11 - when run in conjunction with the 802.11 power saving mode, Span improves communication latency, capacity, and system lifetime.
Original language | English (US) |
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Pages | 85-96 |
Number of pages | 12 |
State | Published - Jan 1 2001 |
Externally published | Yes |
Event | 7th Annual International Conference on Mobile Computing and Networking - Rome, Italy Duration: Jul 16 2001 → Jul 21 2001 |
Other
Other | 7th Annual International Conference on Mobile Computing and Networking |
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Country/Territory | Italy |
City | Rome |
Period | 7/16/01 → 7/21/01 |
All Science Journal Classification (ASJC) codes
- Software
- Hardware and Architecture
- Computer Networks and Communications