Hybrid Common Control Channel Based MAC Protocol for Cognitive Radio Ad-Hoc Networks
Keywords:
Cognitive radio, common control channel, synchronization, multi-channel MAC.Abstract
Multi-channel hidden terminal due to imperfect
CR node synchronization is one of the crucial problems in
dynamic channel availability of Cognitive radio ad-hoc
networks. Most state-of-the-art CR MAC protocols either use
“In-band” or “Out-of-band” overlay based common control
channel (CCC) design for network setup, CR co-ordination
message exchange and CR node synchronization.
With
In-band CCC, neighbor discovery and network setup time will
be very long especially whenever, available PU free spectrum
channels are large in number. Moreover, multi-channel hidden
terminal problem and node synchronization cannot be
effectively resolved due to link based (sequence) and group
based CCC design in opportunistic licensed spectrum bands.
With out-of-band CCC, network setup with dedicated licensed
or unlicensed channel is relatively fast compared with In-band
technique. Subsequently, CR node synchronization problem
will be reduced due to network-wide coordination (broadcast)
without channel switching delay. But, out-of-band Common
control channel is subject to saturation, intruder attacks and
may have interference with other wireless services which will
severely degrade the performance of CR networks. In this
paper, hybrid CCC based MAC protocol is proposed to enhance
the performance of the CR network with respect to CR node
synchronization, multi-channel hidden terminal and network
connectivity time. Experimental results show that the
performance of proposed hybrid CCC based MAC protocol is
out performed compared with existing In-band CCC-MAC
protocols with higher PU free channels and saturated
unlicensed out-of band CCC-MAC protocols.
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