In this paper, we propose the Optimal Offset-time Decision (OOD)
algorithm which can effectively reduce the pre-transmission delay compared to
the perfect isolation model, and can also be extended to general n priority
classes while the target blocking probability of each class is guaranteed for the
variable offered load. In order to drive the OOD algorithm, we first analyze the
blocking probability of each priority class through class aggregation and iteration
method; the analytic results obtained through the proposed algorithm are
then validated with results garnered from extensive simulation tests.