1. A method for communicating by an integrated access and backhaul (IAB) node in a wireless communication system, the method comprising:receiving, from an upper node, configuration information including a periodicity of a random access of a user equipment (UE);
receiving, from the upper node, time resource information related to the random access of the IAB node; and
performing the random access for the upper node based on the periodicity and the time resource information,
wherein the time resource information indicates a weight for the random access of the IAB node, and
wherein the weight satisfies 2 n, and n is an integer value greater than or equal to 0.