  Channel Bonding (CB) is a technique used to provide larger bandwidth to
users. It has been applied to various networks such as wireless local area
networks (WLANs), Wireless Sensor Networks (WSNs), Cognitive Radio Networks
(CRNs), and Cognitive Radio Sensor Networks (CRSNs). The implementation of CB
in CRSNs needs special attention as Primary Radio (PR) nodes traffic must be
protected from any harmful interference by Cognitive Radio (CR) nodes. On the
other hand, CR nodes need to communicate without interruption to meet their
data rate requirements. If CR nodes perform frequent channel switching due to
PR traffic then it will be difficult to meet their quality of service (QoS) and
data rate requirements. So, CR nodes need to select those channels which are
stable. By stable, we mean those channels which cause less harmful interference
to PR nodes and having less PR activity or long remaining idle time. In this
paper, we propose our two approaches Remaining Idle Time aware intelligent
Channel Bonding (RITCB) and Remaining Idle Time aware Intelligent Channel
Bonding with Interference Prevention (RITCB-IP) for cognitive radio sensor
networks which select those channels for CB which have longest remaining idle
time. We compare our approaches with four schemes PRACB, SWA, KNOWS and AGILE.
Simulation results show that our proposed approaches RITCB and RITCB-IP
decrease harmful interference (HIR) and increases the life time of cognitive
radio sensor nodes.
