| 摘要 |
A method and device for updating a multimedia broadcast conditional access plug-in, wherein the sending steps of the front end include: a CA plug-in file is divided into file blocks and file pieces in turn, and the file pieces are encapsulated into service data packets and data units in turn; a frame header is encapsulated in a multiplexing frame after the value of a “plug-in update identification” field configured in the multiplexing frame header is set to be valid, and the data unit is encapsulated in a data segment of the multiplexing sub-frame; and the encapsulated multiplexing frame is modulated to an electromagnetic wave of a physical channel sent to the air. The receiving steps of the terminal include: the multiplexing frame obtained by receiving and tuning is demultiplexed to obtain the “plug-in update identification” field in the frame header; when the value of the field is determined to be valid, the data unit in the data segment of the multiplexing sub-frame is obtained by demultiplexing; and the data units is unpacked into service data packets, file pieces and file blocks in turn, and the file blocks are assembled into a complete CA plug-in file which is downloaded to a CA database. |
