Method for performing 2-stage downlink control information based cross-carrier scheduling in carrier aggregation

A method, applied to a user equipment (UE), to perform 2-stage downlink control information (DCI) based cross-carrier scheduling in carrier aggregation, the method comprising:

• receiving a higher-layer signal from a base station, wherein the higher-layer signal enables the use of 2-stage DCI based cross-carrier scheduling and provides mapping between a scheduling serving cell and one or more scheduled serving cells;
• receiving a first-stage DCI carried in a Physical Downlink Control Channel (PDCCH) in a designated time interval in the scheduling serving cell, wherein the first-stage DCI provides information related to the corresponding second-stage DCI;
• receiving a second-stage DCI corresponding to the first-stage DCI in a specific set of resource elements in the same designated time interval in the same scheduling cell as the first-stage DCI based on the information provided in the first-stage DCI, wherein the second-stage DCI provides scheduling information for the scheduled serving cells;
• and
• performing data reception or transmission over the scheduled serving cells based on the received 2-stage DCI;
• wherein the first-stage DCI is located in a downlink (DL) control region, and the second-stage DCI is located in the DL control region, or in a non-DL-control region, or in both the DL control region and the non-DL-control region.