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NSDI '05 — Abstract
Sustaining Cooperation in Multi-hop Wireless Networks
Ratul Mahajan, Maya Rodrig, David Wetherall, and John Zahorjan,
University of Washington
Abstract
Multi-hop wireless networks are vulnerable
to free-riders because they require nodes to forward packets for each
other. Deployed routing protocols ignore this issue while proposed
solutions incorporate complicated mechanisms with the intent of making
free-riding impossible. We present Catch, a protocol that falls
between these extremes. It achieves nearly the low mechanism
requirements of the former while imposing nearly as effective barriers
to free-riding as the latter. Catch is made possible by novel
techniques based on anonymous messages. These techniques enable
cooperative nodes to detect nearby free-riders and disconnect them
from the rest of the network. Catch has low overhead and is broadly
applicable across routing protocols and traffic workloads. We evaluate
it on an 802.11 wireless testbed as well as through simulation.
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