Multimedia data packet communication with data type identifiers

摘要

A data transmitter (40) comprises means (42, 44) for transmitting a data packet containing identifier information comprising a kind of data, a sequence of data, and/or a packet generating sequence. A receiver (60) includes means (66) for extracting a packet number and the identifier information for an error-receipt occurring data packet based upon the identifier information recorded in a header of the packet, means (67) for generating retransmission control information, such as retransmission times and priority, based on the extracted packet number and the identifier information and transmitting the retransmission control information to the transmitter of the packet. The retransmission of the error-occurring data packets is in accordance with the retransmission control information received by the data transmitter (40). The number of retransmissions and the retransmission priority can be varied according to characteristics of the transmitted data, so that retransmissions is suitable for the characteristics of the data and to more stably receive the data that is more influential to the restoration of the data.