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Rate-splitting multiple access (RSMA) is an emerging multiple accesstechnique for multi-antenna networks that splits messages into common andprivate parts for flexible interference mitigation. Motivated by its robustnessand scalability, it is promising to employ RSMA in integratedsatellite-terrestrial networks (ISTN), where a satellite serves satellite users(SUs) broadly with a multibeam multicast transmission while terrestrial basestation (BS) serves cellular users (CUs) with a unicast transmission, operatingin the same frequency band. To avoid the data exchange betweensatellite/cellular networks via backhaul, we assume a coordinated ISTN relyingon imperfect channel state information. We put forth a coordinated RSMAframework tailored to the coordinated ISTN by applying inter-networkrate-splitting (RS) with a super-common message on top of intra-network RS withcommon/private messages. With the unified RS design for inter- andintra-networks, we jointly optimize the precoding and power allocation of theprivate/common/super-common messages to achieve max-min fairness among all SUsand CUs through successive convex approximation. By doing so, the power of thesuper-common message can be adjusted according to interference levels of thesatellite towards CUs, thereby potentially mitigating inter-networkinterference. Simulation results demonstrate the superiority and robustness ofour approach to cope with various interference and propagation conditions.

Coordinated Rate-Splitting Multiple Access for Integrated Satellite-Terrestrial Networks with Super-Common Message