In accordance with further embodiments of the present disclosure, for the terminal device, to decode the control information mapped as discussed above, it needs to know, for example, to which subframes the control information is mapped to, to which serving cells the control information is mapped to (the premise here is that the terminal device is active on that cell, e.g., due to carrier aggregation support), and so on. In this case, the network device may transmit information (also referred to as “mapping information” hereafter) about the mapping of the control information as discussed to the terminal device. Upon receipt of the mapping information, the terminal device may determine the resource region and thus detect the control information on the resource region.

In an embodiment, the mapping information transmitted by the network device via signaling, such as Radio Resource Control (RRC), Media Access Control (MAC) control element (CE), Physical Layer (PHY) signaling. The mapping information may include various information, for example, but not limited to, subframes to which the control information is mapped, cells to which the control information is mapped, control channel elements or resource elements of subframes to which the control information is mapped, control channel elements or resource elements of cells to which the control information is mapped, an encoding scheme used in the mapping, a numerology of the resource region, a search space of the resource region, and/or the like.