The Strong Interference Channel with Unidirectional Cooperation

We consider the interference channel in which messages sent at one encoder are known to the other encoder, but not vice versa. Such channel model allows for unidirectional node cooperation: the encoder that knows both messages can exploit that information to improve the achievable rates. We derive conditions under which the capacity region of this channel coincides with the capacity region of the channel in which both messages are decoded at both receivers. We compare the obtained conditions with the strong interference conditions in the interference channel with independent messages, as well as in the interference channel with both private and common messages.