Higher bandwidth and spatial reuse through densification of wireless cells are necessary to meet the increase of wireless traffic demand in the next decade. Millimeter wave network can fulfill both of these criteria with the availability of abundant bandwidth and higher spatial reuse through directional beamforming. Millimeter wave band based integrated access and backhaul (IAB), is expected to provide a low cost coverage enhancement and capacity improvement solution. This paper focuses on the system performance of IAB node deployment in terms of coverage and user throughput by field experiment using millimeter wave band. The trial results prove that coverage ratio is significant improved with the introduced IAB node. Meanwhile, dynamic resource allocation, dynamic time division multiplexing (TDM) and dynamic TDM with flexible space division multiplexing (SDM) between access and backhaul link, brings obvious user throughput gain due to better resource utilization and providing more access transmission opportunities for UE in backhaul slot according to the scheduling decision at IAB node.