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In this paper, we propose a rate-splitting design and characterize thesum-degrees-of-freedom (DoF) for the K-user multiple-input-single-output (MISO)broadcast channel with mixed channel state information at the transmitter(CSIT) and order-(K-1) messages, where mixed CSIT refers to the delayed andimperfect-current CSIT, and order-(K-1) message refers to the message desiredby K-1 users simultaneously. In particular, for the sum-DoF lower bound, wepropose a rate-splitting scheme embedding with retrospective interferencealignment. In addition, we propose a matching sum-DoF upper bound via geniesignalings and extremal inequality. Opposed to existing works for K=2, ourresults show that the sum-DoF is saturated with CSIT quality when CSIT qualitythresholds are satisfied for K>2.

Rate-Splitting and Sum-DoF for the K-User MISO Broadcast Channel with Mixed CSIT and Order-(K-1) Messages