  We study joint unicast and multigroup multicast transmission in single-cell
massive multiple-input-multiple-output (MIMO) systems, under maximum ratio
transmission. For the unicast transmission, the objective is to maximize the
weighted sum spectral efficiency (SE) of the unicast user terminals (UTs) and
for the multicast transmission the objective is to maximize the minimum SE of
the multicast UTs. These two problems are coupled to each other in a
conflicting manner, due to their shared power resource and interference. To
address this, we formulate a multiobjective optimization problem (MOOP). We
derive the Pareto boundary of the MOOP analytically and determine the values of
the system parameters to achieve any desired Pareto optimal point. Moreover, we
prove that the Pareto region is convex, hence the system should serve the
unicast and multicast UTs at the same time-frequency resource.
