Jain and Das developed an anycast MAC protocol
to perform channel-state-based next hop
selection among multiple next hop candidates
[7]. The designed protocol is an extension of the
IEEE 802.11 MAC layer. A sender first multicasts
an RTS to the multiple next hop candidates,
which contains the addresses of all the
receivers. CTS transmissions are staggered in
time in order of the priorities of the receivers,
which can be based on hop count or queue
length at the receivers. Upon receipt of a CTS,
the sender transmits DATA to the sender of the
CTS after a short interframe space (SIFS) interval,
which notifies the remaining receivers to
stop sending their CTSs. In [7], this anycast
MAC protocol is further integrated with a multipath
extension to the Ad Hoc On Demand Vector
(AODV) routing protocol, referred to as
AOMDV. Experimental and simulation results
show that the integrated protocol can improve
network performance in time-varying radio environments.