An anycast mechanism is developed at the link layer for wireless ad hoc networks. The goal is to exploit path diversity in the link layer by choosing the best next hop to forward packets when multiple next hop choices are available. Such choices can come from a multipath routing protocol, for example. This technique can reduce transmission retries and packet drop probabilities in the face of channel fading. An anycast extension of the IEEE 802.11 MAC layer based on this idea is developed. The protocol is implemented in an experimental proof-of-concept testbed using the Berkeley motes platform and S-MAC protocol stack.
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