  We consider a homogeneous multiple cellular scenario with multiple users per
cell, i.e., $K\geq 1$ where $K$ denotes the number of users in a cell. In this
scenario, a degrees of freedom outer bound as well as an achievable scheme that
attains the degrees of freedom outer bound of the multicell multiple access
channel (MAC) with constant channel coefficients are investigated. The users
have $M$ antennas, and the base stations are equipped with $N$ antennas. The
found outer bound is general in that it characterizes a degrees of freedom
upper bound for $K\geq 1$ and $L>1$ where $L$ denotes the number of cells. The
achievability of the degrees of freedom outer bound is studied for two cell
case (i.e., L=2). The achievable schemes that attains the degrees of freedom
outer bound for L=2 are based on two approaches. The first scheme is a simple
zero forcing with $M=K\beta+\beta$ and $N=K\beta$, and the second approach is
null space interference alignment with $M=K\beta$ and $N=K\beta+\beta$ where
$\beta>0$ is a positive integer.
