  In this paper, we consider nearest-neighbor oriented percolation with
independent Bernoulli bond-occupation probability on the $d$-dimensional
body-centered cubic (BCC) lattice $\mathbb{L}^d$ and the set of non-negative
integers $\mathbb{Z}_+$. Thanks to the orderly structure of the BCC lattice, we
prove that the infrared bound holds on $\mathbb{L}^d\times\mathbb{Z}_+$ in all
dimensions $d\geq 9$. As opposed to ordinary percolation, we have to deal with
complex numbers due to asymmetry induced by time-orientation, which makes it
hard to bound the bootstrap functions in the lace-expansion analysis. By
investigating the Fourier-Laplace transform of the random-walk Green function
and the two-point function, we derive the key properties to obtain the upper
bounds and resolve a problematic issue in Nguyen and Yang's bound. The issue is
caused by the fact that the Fourier transform of the random-walk transition
probability can take the value $-1$.
