  In this paper, we introduce a lab trial that is conducted to study the
feasibility of ultra-low latency for 5G. Using a novel frame structure and
signaling procedure, a stabilized 1.5 ms hybrid automatic repeat request (HARQ)
round trip time (RTT) is observed in lab trial as predicted in theory. The
achieved round trip time is around 5 times shorter compared with what is
supported by LTE-Advanced standard.
