Biometric gate access is a time-sensitive application—every millisecond counts from palm wave to barrier release. 4G LTE networks introduce intrinsic latency through radio scheduling, backhaul propagation, and core network processing. When a facial recognition device captures a probe image and sends it to a cloud matcher, the round-trip time (RTT) directly dictates the gate’s opening delay. Industry standards require <300 ms from capture to actuation for natural pedestrian flow. 4G’s average RTT of 40–60 ms in idle mode seems promising, but real-world congestion pushes this to 180–250 ms, leaving barely 50 ms for inference and motor control—a razor-thin margin.