Reception apparatus and method, program, and recording medium

• US 20050169199A1
• Filed: 12/30/2004
• Published: 08/04/2005
• Est. Priority Date: 01/08/2004
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yamane, Kenji, Futenma, Satoshi
• Granted Patent: US 8,155,035 B2
• Time in Patent Office: Days
• US Class Current: 370/282
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/2416 Real-time traffic
• CPC Class Codes: H04L 47/26 using explicit feedback to the source, e.g. choke packets
• CPC Class Codes: H04L 47/283 in response to processing delays, e.g. caused by jitter or round trip time [RTT]
• CPC Class Codes: H04L 47/34 ensuring sequence integrity, e.g. using sequence numbers
• CPC Class Codes: H04L 47/431 using padding or de-padding
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/80 Responding to QoS

Abstract

A reception apparatus and method is disclosed wherein recovery of a lost packet can be performed simply and rapidly in response to the variation of the loss rate. A packet analysis section detects loss of a packet, and a retransmission processing section registers packet information including a sequence number for identification of a packet having been lost into a NACK list. When loss of a packet is detected by the packet analysis section, a NACK production section produces a NACK packet for requesting for retransmission of the non-arriving packet whose packet information is registered in the NACK list. A network inputting/outputting section transmits the NACK packet to a transmission apparatus. The invention can be applied to a reception apparatus which receives, for example, streaming data.

Claims

1. A reception apparatus for receiving packets successively transmitted from a transmission apparatus, comprising:

a detection section for detecting loss of a packet;

a registration section for registering packet information including identification information for identification of the packet with which the loss occurs into a retransmission request list;

a retransmission requesting packet production section for producing, when loss of a packet is detected by said detection section, a retransmission requesting packet for requesting for retransmission of the non-arriving packet whose packet information is registered in said retransmission request list; and

a retransmission requesting packet transmission section for transmitting the retransmission requesting packet to said transmission apparatus.

2. A reception apparatus according to claim 1, further comprising:

a round-trip time measurement section for measuring round-trip time which is an interval of time after a retransmission requesting packet is transmitted to said transmission apparatus until a retransmission packet corresponding to the packet whose retransmission is requested by the retransmission requesting packet arrives from said transmission apparatus at said reception apparatus;

a reproduction discrimination section for comparing a reproduction allowance time period which is a period of time of allowance before reproduction of the non-arriving packet is to be performed and the round-trip time with each other to discriminate whether or not the retransmission packet corresponding to the non-arriving packet arrives in time prior to the reproduction time of the retransmission packet; and

a deletion section for deleting the packet information of the non-arriving packet which does not arrive in time prior to the reproduction time from said retransmission request list.

3. A reception apparatus according to claim 1, further comprising:

a retransmission packet reception section for receiving a retransmission packet transmitted from said transmission apparatus and corresponding to the packet whose retransmission is requested by the retransmission requesting packet; and

a deletion section for deleting the packet information of the non-arriving packet corresponding to the retransmission packet received by said retransmission packet reception section from said retransmission request list.

4. A reception apparatus according to claim 1, wherein said retransmission requesting packet production section produces the retransmission requesting packet for all of the non-arriving packets whose packet information is registered in said retransmission request list.

5. A reception apparatus according to claim 1, wherein the packet information further includes a count value for counting the number of times by which loss is detected by said detection section, and said retransmission requesting packet production section produces the retransmission requesting packet for those of the non-arriving packets having the packet information registered in said retransmission request list which have the count values not less than a threshold value.

6. A reception apparatus according to claim 5, further comprising:

a loss interval calculation section for calculating a loss interval which is an interval of time between times at which loss of a packet occurs; and

a setting section for setting the threshold value based on the calculated loss interval.

7. A reception apparatus according to claim 5, further comprising:

a round-trip time measurement section for measuring round-trip time which is an interval of time after a retransmission requesting packet is transmitted to said transmission apparatus until a retransmission packet corresponding to the packet whose retransmission is requested by the retransmission requesting packet arrives from said transmission apparatus at said reception apparatus; and

a setting section for setting the threshold value based on the measured round-trip time.

8. A reception apparatus according to claim 5, further comprising a resetting section for resetting the count regarding the non-arriving packet whose retransmission is requested by the retransmission requesting packet.

9. A reception method for receiving packets successively transmitted from a transmission apparatus, comprising:

a detection step of detecting loss of a packet;

a registration step of registering packet information including identification information for identification of the packet with which the loss occurs into a retransmission request list;

a retransmission requesting packet production step of producing, when loss of a packet is detected by the detection step, a retransmission requesting packet for requesting for retransmission of the non-arriving packet whose packet information is registered in the retransmission request list; and

a retransmission requesting packet transmission step of transmitting the retransmission requesting packet to said transmission apparatus.

10. A program for allowing a computer to execute a reception process for receiving packets successively transmitted from a transmission apparatus, comprising:

a detection step of detecting loss of a packet;

a registration step of registering packet information including identification information for identification of the packet with which the loss occurs into a retransmission request list;

a retransmission requesting packet production step of producing, when loss of a packet is detected by the detection step, a retransmission requesting packet for requesting for retransmission of the non-arriving packet whose packet information is registered in the retransmission request list; and

a retransmission requesting packet transmission step of transmitting the retransmission requesting packet to said transmission apparatus.

11. A recording medium on which a computer-readable program for allowing a computer to execute a reception process for receiving packets successively transmitted from a transmission apparatus is recorded, the program comprising:

a detection step of detecting loss of a packet;

a registration step of registering packet information including identification information for identification of the packet with which the loss occurs into a retransmission request list;

a retransmission requesting packet production step of producing, when loss of a packet is detected by the detection step, a retransmission requesting packet for requesting for retransmission of the non-arriving packet whose packet information is registered in the retransmission request list; and

a retransmission requesting packet transmission step of transmitting the retransmission requesting packet to said transmission apparatus.