The present invention relates to a wireless communication system, and more particularly, to a method and device for performing or supporting NIB coordinated multi-point (CoMP) transmission in a wireless communication system. The method for performing NIB CoMP transmission in the wireless communication system according to an embodiment of the present invention may include: receiving signaling comprising at least one CoMP hypothesis set and at least one benefit metric information bit from a first network node, at a second network node; performing CoMP transmission based on the at least one CoMP hypothesis set, at the second network node. The at least one CoMP hypothesis set and the at least one benefit metric information bit are defined in information element format included in the signaling, and information indicated by the at least one benefit metric information comprises specific information, for which the at least one benefit metric information configured as special value.