  We consider the $K$-User Multiple-Input-Single-Output (MISO) Broadcast
Channel (BC) where the transmitter, equipped with $M$ antennas, serves $K$
users, with $K \leq M$. The transmitter has access to a partial channel state
information of the users. This is modelled by letting the variance of the
Channel State Information at the Transmitter (CSIT) error of user $i$ scale as
$O(P^{-\alpha_i}$) for the Signal-to-Noise Ratio (SNR) $P$ and some constant
$\alpha_i \geq 0$. In this work we derive the optimal Degrees-of-Freedom (DoF)
region in such setting and we show that Rate-Splitting (RS) is the key scheme
to achieve such a region.
