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Summary: Efficiency through Eavesdropping:
Link-layer Packet Caching
Mikhail Afanasyev, David G. Andersen, and Alex C. Snoeren
University of California, San Diego and Carnegie Mellon University
{mafanasyev,snoeren}@cs.ucsd.edu, dga@cs.cmu.edu
Abstract
The broadcast nature of wireless networks is the source
of both their utility and much of their complexity. To turn
what would otherwise be unwanted interference into an
advantage, this paper examines an entirely backwards-
compatible extension to the 802.11 link-layer protocol for
making use of overheard packets, called RTS-id. RTS-id
operates by augmenting the standard 802.11 RTS/CTS
process with a packet ID check, so that if the receiver
of an RTS message has already received the packet in
question, it can inform the sender and bypass the data
transmission entirely.
We present the design, implementation, and evaluation
of RTS-id on a real hardware platform that provides a
DSP-programmable 802.11 radio. While limited in scale
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