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Summary: Wireless ACK Collisions Not Considered Harmful
Prabal Dutta
Razvan Musaloiu-E.
Ion Stoica
Andreas Terzis
Computer Science Division
Computer Science Department
University of California, Berkeley Johns Hopkins University
Berkeley, California 94720 Baltimore, Maryland 21218
ABSTRACT
We present an acknowledged anycast primitive that al-
lows a node to wirelessly transmit a packet and effi-
ciently determine that at least one neighbor successfully
received it. The initiator transmits a single packet to a
unicast, multicast, or broadcast address and all nodes
that match the destination respond with identical ac-
knowledgment packets automatically generated by the
hardware. Although these acknowledgments interfere,
they usually do so non-destructively, so the initiator can
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