Methods and system for a centralized unit and a distributed unit of a base station to operatively cooperate with each other are disclosed. In one embodiment, a method performed by a first communication node includes: in response to receiving a request, transmitting a first message to a second wireless communication node requesting to either establish or modify a context of a data radio bearer (DRB); and receiving a second message from the second wireless communication node indicating that the context of the DRB has been established or modified at the second wireless communication node, wherein the first message comprises first user plane address information of the DRB, and the second message comprises second user plane address information of the DRB.