Before revision:  To the best of our knowledge, we first present a linear programming optimization model for this joint problem  taking into account the feature of CRNs channel uncertainty. Considering the queue state of a node, we propose a new scheme to select proper forwarding candidates for opportunistic routing.
After revision:  To the best of our knowledge, we first present a linear programming optimization model for this joint problem taking into account the feature of CRNs-channel uncertainty. Then considering the queue state of a node, we propose a new scheme to select proper forwarding candidates for opportunistic routing.