Interactive relay assisted source coding

This paper investigates a source coding problem in which two terminals communicating through a relay wish to estimate one another´s source within some distortion constraint. The relay has access to side information that is correlated with the sources. Two different schemes based on the order of communication, distributed source coding/delivery and two cascaded rounds, are proposed and inner and outer bounds for the resulting rate-distortion regions are provided. Examples are provided to show that neither rate-distortion region includes the other one.