Paketwiederübertragung mit Prioritätinformationen

摘要

A data transmitter (10) transmits packets each with a sequence number and a priority added. A data receiver (20) detects any packet loss by referring to the sequence numbers added to the packets, and if detecting any packet of high priority as having been lost, requests for packet retransmission. Based on information about thus detected packet loss, the data receiver (20) generates and transmits an RR packet (110) indicating the packet reception state. The data transmitter (10) extracts from the RR packet (110) a packet loss ratio (200), and therewith, changes manners of priority assignment. The manners are so changed that the packet of high priority is found with a lower ratio when the packet loss ratio (200) is high, and when the packet loss ratio (200) is low, found with a higher ratio.