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We investigate achievable degrees of freedom (DoF) for a multiple-inputmultiple-output (MIMO) multiway relay channel (mRC) with $L$ clusters and $K$users per cluster. Each user is equipped with $M$ antennas and the relay with$N$ antennas. We assume a new data exchange model, termed \emph{clustered fulldata exchange}, i.e., each user in a cluster wants to learn the messages of allthe other users in the same cluster. Novel signal alignment techniques aredeveloped to systematically construct the beamforming matrices at the users andthe relay for efficient physical-layer network coding. Based on that, we derivean achievable DoF of the MIMO mRC with an arbitrary network configuration of$L$ and $K$, as well as with an arbitrary antenna configuration of $M$ and $N$.We show that our proposed scheme achieves the DoF capacity when $\frac{M}{N}\leq \frac{1}{LK-1}$ and $\frac{M}{N} \geq \frac{(K-1)L+1}{KL}$.

MIMO Multiway Relaying with Clustered Full Data Exchange: Signal Space Alignment and Degrees of Freedom