| 摘要 |
<p>When an IGMP control message is included in a variable length packet having an address for performing one to one or one to multiple communication with mobile station units (106-1 to 106-3) at a base station unit (102), the IGMP control message is mapped to a short packet having a fixed length shorter than that of a fixed length packet used for communication with the mobile station units (106-1 to 106-3), and the variable length packet is mapped to a fixed length packet. The fixed length packet and the short packet are then transmitted as a frame signal. At the mobile station units (106-1 to 106-3) the frame signal is decomposed to take out the variable length packet and the short packet, and the IGMP control message is taken out from the short packet and mapped to another variable length packet, thus multiplexing both variable length packets.</p> |
