should reflect the node resources. This information will be used for identifying the specific channels/nodes that can be part of a COOP or ANC-OL transmission. To understand how this works consider the example in Fig. \[fig:topology-mac-cc2\]. In this figure $N_2$ overhears cooperative transmissions (the CTC message) between $N_4$ and $N_5$ with $N_3$ being the relay. In a symmetrical fashion, $N_5$ overhears the cooperative transmission from $N_1$ to $N_2$ with the help of $N_3$. (3) A node should piggyback in its outgoing CTS message the results of the channel estimation only for channels that are formed between another node and themselves, but only if both have used the same relay in the past. This check is performed in lines 6-9 of the algorithm with information that is extracted from the $\mathbf{anfl}$ data structure that contains monitored data from several past relayed transmissions. To continue our previous example when $N_2$ sends a CTS for responding to an RTS from $N_1$, it includes in the CTS response not only the estimate $\tilde{h}_1$, but also the estimate that it has for $\tilde{h}_8$ which was obtained from previous transmissions of RTS messages from $N_4$ (Recall a few lines above that $N_4$ and $N_3$ were included 