The first node may be connected to a third node on the basis of a third backhaul link, and a slot format for the second backhaul link differs from a slot format for the third backhaul link.
A slot format for the backhaul link may differ from a slot format for the access link.
In another aspect, a first node in a wireless communication system is provided. The first node may comprise a memory, a transceiver and a processor operably connected to the memory and the transceiver, wherein the processor is configured: to perform a first data transmission or reception to or from a UE on an access link on the basis of a first timing case in an access time duration and to perform a second data transmission or reception to or from a second node or a donor base station on a backhaul link on the basis of a second timing case in a backhaul time duration, wherein downlink transmission timings over the donor base station, the first node, the second node and the UE are aligned in the first timing case, and downlink and uplink transmission timings or downlink and uplink reception timings are aligned in the first node in the second timing case.