For the asymmetric two-cluster MIMO mRIC, we show that the BIN scheme can obtain a higher DoF than the SSA scheme in  when the SSA cannot obtain the optimal achievable DoF.
In Section 4, the achievable DoF of the considered MIMO mRIC is investigated and the achievability of the DoF upper bound is proved.
We describe a system model for the two-cluster MIMO mRIC with two relay nodes and two users per cluster as shown in Fig.
Then, we define the sum DoF of the two-cluster MIMO mRIC with two users per cluster as
In this section, we provide a DoF upper bound of the considered MIMO mRIC based on cut-set bound.
If we consider a symmetric two-cluster MIMO mRIC with two users per cluster, the number of antennas at each user is equal to M.
In this section, we provide a detailed transmission scheme to obtain the achievable DoF of the considered mRIC and verify that the DoF upper bound can be achieved.
The following theorem establishes the achievable DoF of the considered mRIC with the general system configuration (n|[M.sup.1.sub.1], [M.sup.2.sub.1], [M.sup.1.sub.2], [M.sup.2.sub.2]).
Theorem 1: For the two-cluster mRIC with two users per cluster, we can show that the following DoF is achievable:
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