Resource allocation method, device and system of wireless communication system

A UE of a wireless communication system and a wireless communication method using it are described. More particularly, the method includes receiving scheduling information including resource allocation information, wherein the resource allocation information comprises a RIV determined based on the number of RBs of a first BWP, and transmitting or receiving data on a set of RBs corresponding to the RIV in a second BWP, wherein the number of RBs of the second BWP is greater than the number of RBs of the first BWP, the initial RB index S and the number of RBs in the RB set corresponding to the RIV in the second BWP are given in powers of 2 and a device for the same is described. (Automatic translation with Google Translate, no legal value)