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This work considers the multiuser multiple-input single-output (MISO)broadcast channel (BC), where a transmitter with M antennas transmitsinformation to K single-antenna users, and where - as expected - the qualityand timeliness of channel state information at the transmitter (CSIT) isimperfect. Motivated by the fundamental question of how much feedback isnecessary to achieve a certain performance, this work seeks to establish boundson the tradeoff between degrees-of-freedom (DoF) performance and CSIT feedbackquality. Specifically, this work provides a novel DoF region outer bound forthe general K-user MISO BC with partial current CSIT, which naturally bridgesthe gap between the case of having no current CSIT (only delayed CSIT, or noCSIT) and the case with full CSIT. The work then characterizes the minimum CSITfeedback that is necessary for any point of the sum DoF, which is optimal forthe case with M >= K, and the case with M=2, K=3.

On the Fundamental Feedback-vs-Performance Tradeoff over the MISO-BC with Imperfect and Delayed CSIT