Air-ground integrated multicast network communication method and system based on BIER

The invention discloses a space-ground integrated multicast network communication method and system based on BIER, and the method comprises the steps: obtaining a preset space-ground integrated network physical characteristic, carrying out the hierarchical division of a space-ground integrated network based on the space-ground integrated network physical characteristic, and obtaining a plurality of network layers; the method comprises the following steps: performing routing control on a low-orbit satellite layer through a ground layer and a high-orbit satellite layer to obtain a routing table, and updating an initial forwarding table of the routing table based on a preset time slice division mode to obtain a target forwarding table; and based on the BIER protocol and the target forwarding table, carrying out data transmission on the air-ground integrated network through a ground layer and a low-orbit satellite layer so as to realize multicast network communication. According to the embodiment of the invention