Packet transmission apparatus and packet transmission method
OwnerKoji Imura, Daiji Ido +2inventors
InventorsKoji Imura, Daiji Ido, Akihiro Miyazaki, Koichi Hata
Life of this patent
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Abstract
When an RTP packet generating section outputs a retransmission request signal to a compression method selecting section, the compression method selecting section compares a sequence number of a retransmission packet with a sequence number of context stored in a buffer. When the sequence number of the retransmission packet is smaller than the sequence number of the context, the compression method selecting section selects, as a header of the retransmission packet, a header which is decompressed not referring to reference information and is not used in updating the reference information in a communicating party.
Claims5
A packet transmission apparatus used in a packet communication system in which header compression and decompression is performed using reference information, the apparatus comprising:
- a retransmission section that retransmits a packet in response to a retransmission request from a communicating party;
- and
- a selecting section which, in retransmitting a packet that has been transmitted prior to update of reference information, selects a header which is decompressed not referring to the reference information and is not used to update the reference information at the communicating party, as a header of a retransmission packet.
A program for making a computer execute:
- a retransmission step of retransmitting a packet in response to a retransmission request from a communicating party;
- and
- a selecting step of selecting a header which is decompress not referring to reference information and is not used to update the reference information at the communicating party, as a header of a retransmission packet, in retransmitting a packet that has been transmitted prior to update of the reference information that is used in compression and decompression of a header.
A packet transmission method,
- on a packet receiving side, transmitting a retransmission request of a packet to a packet transmitting side, in detecting an error on a received packet;
- and
- on the packet transmitting side, selecting a header which is decompressed not referring to reference information and is not used to update the reference information on the packet receiving side, in retransmitting a packet that has been transmitted prior to update of the reference information that is used in compression and decompression of a header.
Dependencies are inferred from the claim text.