Packet delay in radio link protocol layer is the critical part of session setup delay.Previous study assumed saturation to calculate this delay.But the saturation assumption does not hold for session setup.This paper analyzes the RLP packet delay in session setup.Through the study of the transmission status of all frames in the same packet

we propose an iterative calculation method.Simulation results demonstrate that the proposed method can accurately calculate the packet delay in session setup.Comparing the packet delay under the saturation assumption with the packet delay under session setup

we can find that the former delay can be 100 ms longer than the later one.