METHOD AND DEVICE FOR RETRANSMITTING PACKET OF MMT SERVICE, AND RETRANSMISSION REQUEST METHOD AND DEVICE

• US 20160337091A1
• Filed: 01/06/2015
• Published: 11/17/2016
• Est. Priority Date: 01/09/2014
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute, Yonsei University
• Original Assignee: Electronics and Telecommunications Research Institute, Yonsei University
• Inventors: KIM, Chang Ki, SEO, Kwang Deok, YOO, Jeong Ju, HONG, Jin Woo
• Granted Patent: US 10,097,319 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/1838 for semi-reliable protocols, e.g. for less sensitive applications such as streaming video buffer level management for video bitstream receiver H04N21/44004
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• 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]

Abstract

The present invention discloses a method of re-transmission of a lost MMT packet by a packet transmission apparatus. The method includes generating a media processing unit (MPU) based on a media fragment unit (MFU) and generating an MMT asset by encapsulating the MPU; generating an MMT packet based on the MPU included in the generated MMT asset; and transmitting the generated MMT packet, wherein the method further comprises adding, in a signaling message related to re-transmission of the MMT packet, delay_constrained_ARQ_flag to indicate whether or not the MMT packet transmission apparatus supports a delay-constrained automatic repeat request (ARQ) function.

Claims

1. A method of an MPEG media transport (MMT) packet transmission apparatus for re-transmitting a lost packet, the method comprising:

generating an MMT packet by processing multiple media fragment units (MFUs); and

transmitting the generated MMT packet to an MMT packet receiving apparatus,

wherein the method further comprises transmitting to the MMT packet receiving apparatus an automatic repeat request (ARQ) configuration (AC) message including delay constrained ARQ flag to indicate whether the MMT packet transmission apparatus supports a delay-constrained ARQ function.

4. The method of claim 1, further comprising:

receiving an ARQ feedback (AF) message from the MMT packet receiving apparatus to request re-transmission of the lost packet, wherein the AF message includes timing information;

updating a round-trip time (RTT) based on the timing information; and

determining whether to transmit the lost packet requested to be re-transmitted based on the updated RTT.

6. The method of claim 4, wherein the timing information comprises:

propagation_delay that indicates a difference between an NTP time at a moment of delivery of a packet and an NTP time at a moment of packet arrival.

7. The method of claim 4, wherein the timing information comprises ARQ feedback timestamp that records a network time protocol (NTP) time which corresponds to a delivery time of the AF message and arrival_deadline that indicates an arrival deadline of a retransmitted packet and wherein the RTT is updated by calculating an ARQ feedback delay time based on a difference between the ARQ feedback timestamp and an arrival time of the AF message.

9. The method of claim 7, wherein if the updated RTT does not exceed the arrival_deadline, the lost packet requested to be re-transmitted is transmitted to the MMT packet receiving apparatus, and if the updated RTT exceeds the arrival_deadline, the lost packet to be re-transmitted is not transmitted.

10. The method of claim 6, wherein the RTT is updated based on the propagation_delay, and if the updated RTT does not exceed fixed_end_to_end_delay, the lost packet to be re-transmitted is transmitted to the MMT packet receiving apparatus, and if the updated RTT exceeds the fixed_end_to_end_delay, the lost packet to be re-transmitted is not transmitted.

2. (canceled)

3. (canceled)

5. (canceled)

8. (canceled)

11. (canceled)

12. A method of an MPEG media transport (MMT) packet receiving apparatus for requesting re-transmission of a lost packet, the method comprising:

receiving an MMT packet and an automatic repeat request (ARQ) configuration (AC) message from an MMT packet transmission apparatus, wherein the AC message includes delay constrained ARQ flag to indicate whether the MMT packet transmission apparatus supports a delay-constrained ARQ function;

generating multiple media fragment units (MFUs) by depacketizing the received MMT packet and processing the depacketized MMT packet; and

transmitting an ARQ feedback (AF) message for requesting re-transmission of the lost packet in case the MMT packet is lost during the transmission from the MMT packet transmission apparatus.

13. The method of claim 12, wherein timing information is included in the AF message to allow for calculation of an RTT that is required by the MMT packet transmission apparatus when determining whether to transmit a packet requested to be re-transmitted.

14. The method of claim 13, wherein the timing information comprises propagation_delay that indicates a difference between an NTP time at a moment of delivery of a packet and an NTP time at a moment of packet arrival.

15. The method of claim 13, wherein the timing information comprises ARQ feedback timestamp that records a network time protocol (NTP) time which corresponds to a delivery time of the AF message and

arrival_deadline to indicate an arrival deadline of a retransmitted packet.

16. The method of claim 15, wherein the arrival_deadline is calculated based on play time and decoding time of data which is to be played earlier than the lost packet, the play time and decoding time being stored beforehand in a receiver buffer.

17. The method of claim 16, wherein the arrival_deadline is calculated by dividing an amount of the data in the receiver buffer by an average bitrate for packet stream.

18. The method of claim 15, wherein the arrival_deadline is represented as a time increment starting from the ARQ_feedback_timestamp.

19. The method of claim 12, wherein in order to indicate the lost packet, packet_counter to count transmitted packets is further included in the AF message, or both packet_id and packet_sequence_number to indicate each packet with the packet_id is further included in the AF message, wherein the packet_id is assigned to each asset in order to distinguish packets of different assets from each other.

20. (canceled)

21. A processing method of an MPEG media transport (MMT) packet transmission apparatus for re-transmitting a lost packet, the processing method comprising:

transmitting an automatic repeat request (ARQ) configuration (AC) message to an MMT packet receiving apparatus, wherein the AC message includes delay_constrained_ARQ_flag to indicate whether the MMT packet transmission apparatus supports a delay-constrained ARQ function;

receiving an ARQ feedback (AF) message from the MMT packet receiving apparatus to request re-transmission of the lost packet, wherein the AF message includes timing information; and

determining whether to transmit the lost packet requested to be re-transmitted using the received timing information.

22. The processing method of claim 21, wherein further comprising updating a round-trip time (RTT) using the timing information, and

the determining of whether to transmit the lost packet requested to be re-transmitted is performed based on the updated RTT.

23. The processing method of claim 22, wherein the timing information comprises propagation_delay that indicates a difference between an NTP time at a moment of delivery of a packet and an NTP time at a moment of packet arrival.

24. The processing method of claim 23, wherein the RTT is updated based on the propagation_delay, and if the updated RTT does not exceed fixed_end_to_end_delay, the lost packet to be re-transmitted is transmitted to the MMT packet receiving apparatus, and if the updated RTT exceeds the fixed_end_to_end_delay, the lost packet to be re-transmitted is not transmitted.

25. The processing method of claim 22,

wherein the timing information comprises ARQ_feedback_timestamp that records a network time protocol (NTP) time which corresponds to a delivery time of the AF message and arrival_deadline, and

wherein the RTT is updated by calculating an ARQ feedback delay time based on a difference between the ARQ_feedback_timestamp and an arrival time of the AF message.

26. The processing method of claim 25, wherein if the updated RTT does not exceed the arrival_deadline, the lost packet requested to be re-transmitted is transmitted to the MMT packet receiving apparatus, and if the updated RTT exceeds the arrival_deadline, the lost packet to be re-transmitted is not transmitted.