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A state-dependent relay channel is studied in which strictly causal channelstate information is available at the relay and no state information isavailable at the source and destination. The source and the relay are connectedvia two unidirectional out-of-band orthogonal links of finite capacity, and astate-dependent memoryless channel connects the source and the relay, on oneside, and the destination, on the other. Via the orthogonal links, the sourcecan convey information about the message to be delivered to the destination tothe relay while the relay can forward state information to the source. Thisexchange enables cooperation between the source and the relay on transmissionof message and state information to the destination. First, two achievableschemes are proposed that exploit both message and state cooperation. It isshown that a transmission scheme inspired by noisy network coding performsbetter than a strategy based on block Markov coding and backward decoding.Next, based on the given achievable schemes and appropriate upper bounds,capacity results are identified for some special cases. Finally, a Gaussianmodel is studied, along with corresponding numerical results that illuminatethe relative merits of state and message cooperation.

Message and State Cooperation in a Relay Channel When Only the Relay Knows the State