Random message arrivals in a gaussian cognitive radio

We study the impact of random message arrivals in a two user Gaussian interference channel with one-way co-operation, also called as cognitive radio. In this model, one user (labeled cognitive user) has information about the message of the other user (labeled primary user). Specifically, we quantify the reduction in queuing delay for both the primary and cognitive users when the cognitive user has either non-causal or causal information about primary users data. Surprisingly, we find that the delay for the primary user also reduces even though the cognitive user does not use any of its transmission power to relay the information of the primary user.