Systems and methods for performing carrier aggregation in wireless sidelink communications are disclosed herein. In one embodiment, a method performed by a first node is disclosed. The method comprises: obtaining configuration information related to sidelink data transmission between the first node and at least one second node, wherein the configuration information comprises one or more rules related to carrier aggregation for the sidelink data transmission, wherein the one or more rules comprise information related to a reliability level associated with the sidelink data transmission; and transmitting the sidelink data to the at least one second node on a plurality of carriers based on the configuration information.