Packet transmission apparatus, communication system and program

• US 8,234,548 B2
• Filed: 06/01/2011
• Issued: 07/31/2012
• Est. Priority Date: 11/09/2005
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kure, Yoshinobu, Kawada, Masato
• Primary Examiner(s): Alphonse, Fritz
• Application Number:
  US13/150,890
• Publication Number:
  US 20110231727A1
• Time in Patent Office: 426 Days
• Field of Search: 714/779, 714/776, 714/750, 714/752, 714/758, 714/748, 714/749
• US Class Current: 714/779
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/1816 with retransmission of the same, encoded, message
• CPC Class Codes: H04L 1/1877 for semi-reliable protocols, e.g. for less sensitive applications like streaming video buffer level management for video bitstream control arrangements H04N21/44004

Abstract

A packet transmission apparatus is provided. The packet transmission apparatus transmits a packet having a limited arrival deadline through a best-effort network. The packet transmission apparatus includes an automatic packet retransmission section to control retransmission of an undelivered packet, a forward error correction coding section to add a redundant packet to a data packet block, and a redundancy determining section to dynamically determine redundancy of the redundant packet based on observed network state information, so that a loss rate after error correction at a receiver achieved by only the retransmission of the undelivered packet satisfies an allowable loss rate after error correction.

Claims

1. A packet transmission apparatus to transmit a data packet having a limited arrival time, comprising:

a packet retransmission section configured to control retransmission of an undelivered data packet;

a forward error correction coding section configured to generate a forward error correction (FEC) packet for the data packet having the limited arrival time based on a redundancy level;

a transmission section configured to transmit the data packet, the FEC packet, and a retransmission packet; and

a redundancy level determining section configured to receive network state information and dynamically determine a number of data packets based on the network state information.

2. The packet transmission apparatus according to claim 1, wherein the network state information comprises round trip time information.

3. The packet transmission apparatus according to claim 1, wherein the network state information comprises round trip time information and a packet loss rate.

4. A packet transmission method for transmitting a data packet having a limited arrival time from a packet transmission apparatus, comprising:

controlling retransmission of an undelivered packet;

generating a forward error correction (FEC) packet for the data packet having the limited arrival time based on a redundancy level;

transmitting, by the packet transmission apparatus, the data packet, the FEC packet, and a retransmission packet;

receiving network state information; and

dynamically determining a number of data packets based on the network state information.

5. The packet transmission method according to claim 4, wherein the network state information comprises round trip time information.

6. The packet transmission method according to claim 4, wherein the network state information comprises round trip time information and a packet loss rate.

7. A non-transitory computer readable storage medium storing a computer program for transmitting a data packet having a limited arrival deadline, the program causing a packet transmission apparatus to:

control retransmission of an undelivered packet;

generate a forward error correction (FEC) packet for the data packet having the limited arrival time based on a redundancy level;

transmit the data packet, the FEC packet, and a retransmission packet;

receive network state information; and

dynamically determine a number of data packets based on the network state information.

8. The non-transitory computer readable storage medium storing a computer program according to claim 7, wherein the network state information comprises round trip time information.

9. The non-transitory computer readable storage medium storing a computer program according to claim 7, wherein the network state information comprises round trip time information and a packet loss rate.