Indicating delays added to packets due to retransmission

• US 10,284,483 B2
• Filed: 06/22/2017
• Issued: 05/07/2019
• Est. Priority Date: 02/07/2007
• Status: Active Grant

• Current Assignee: Valens Semiconductor Ltd.
• Original Assignee: Valens Semiconductor Ltd.
• Inventors: Lida, Eyran
• Primary Examiner(s): Tabone, Jr., John J
• Application Number:
  US15/630,819
• Publication Number:
  US 20170289058A1
• Time in Patent Office: 684 Days
• Field of Search: 714748
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1841 Resequencing
• 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
• CPC Class Codes: H04L 25/4919 using balanced multilevel codes H04L25/4927 takes precedence
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 47/56 implementing delay-aware scheduling
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence

Abstract

System and method indicating delays added to packets due to retransmission events. The method includes the steps of receiving multiple packet streams and multiplexing them into a first multiplexed packet stream; storing in memory the first multiplexed packet stream together with time indications; receiving a retransmission request and selecting data for retransmission; multiplexing the first multiplexed packet stream and the data for retransmission into a second multiplexed packet stream; utilizing the time indications for calculating delays that were added to packets of the second multiplexed packet stream as a result of fulfilling the retransmission request; adding the calculated delays to at least some of the packets of the second multiplexed packet stream; and transmitting the second multiplexed packet stream.

Claims

1. A transceiver configured to indicate delays added to packets due to retransmission events, comprising:

a first scheduler, memory, a retransmission module, a second scheduler, a delay indicator module, and a physical layer module;

the first scheduler is configured to receive packet streams, multiplex the packet streams into a first multiplexed packet stream, and to add time indications;

the memory is configured to store the first multiplexed packet stream together with the time indications;

the retransmission module is configured to receive a retransmission request and to select data for retransmission;

the second scheduler is configured to receive the first multiplexed packet stream and the data for retransmission, and to multiplex the first multiplexed packet stream and the data for retransmission into a second multiplexed packet stream;

the delay indicator module is configured to utilize the time indications to calculate delays added to packets of the second multiplexed packet stream as a result of fulfilling the retransmission request;

the delay indicator module is further configured to add the calculated delays to at least some of the packets of the second multiplexed packet stream; and

the physical layer module is configured to transmit the second multiplexed packet stream.

2. The transceiver of claim 1, wherein the time indications are added per packet, and are based on the local clock of the transceiver.

3. The transceiver of claim 1, wherein the retransmission request is received from a second transceiver to which the data for retransmission was already transmitted by the transceiver.

4. The transceiver of claim 3, wherein clocks of the transceiver and the second transceiver are not synchronized.

5. The transceiver of claim 3, wherein payloads of packets that were not retransmitted yet to the second transceiver are transmitted using a first error resistance level, and payloads containing retransmitted data are transmitted using a second error resistance level that is higher than the first error resistance level.

6. The transceiver of claim 5, wherein the second error resistance level is strong enough to ensure that a single retransmission is enough for transmitting successfully the retransmitted data.

7. The transceiver of claim 3, wherein the second transceiver is configured to:

receive the packets from the transceiver, transmit the non-retransmitted packets after a fixed delay using a first error resistance level to a third transceiver over a wired communication link, store the payloads in a second memory, receive a second retransmission request for a second payload that is included in the payloads stored in the second memory, and retransmit the second payload using a second retransmission packet encoded with a second error resistance level that is higher than the first error resistance level.

8. The transceiver of claim 7, wherein the second error resistance level is strong enough to ensure that a single retransmission is enough for transmitting successfully the second payload.

9. The transceiver of claim 1, wherein the memory is a shared memory, and the data for retransmission is selected from the first multiplexed packet stream stored in the memory.

10. The transceiver of claim 1, wherein the memory comprises at least two memories:

a first memory configured to store the first multiplexed packet stream while waiting for transmission, and a second memory configured to store the already transmitted packet while waiting for possible retransmission.

11. The transceiver of claim 1, wherein the second scheduler is further configured to receive link management packets, and to multiplex the link management packets into the second multiplexed packet stream.

12. The transceiver of claim 1, wherein the calculated delay account for time from receiving a packet at the first scheduler until the received packet is forwarded to the physical layer for transmission.

13. The transceiver of claim 1, wherein the first scheduler, the retransmission module, the second scheduler, and the delay indicator module are implemented using one or more processors.

14. The transceiver of claim 1, wherein the retransmission module and the memory are designed to support multi retransmission events of the same data.

15. The transceiver of claim 1, wherein the physical layer module is an HDBaseT®

physical layer module, and the second multiplexed packet stream is an HDBaseT®

stream.

16. A method for indicating delays added to packets due to retransmission events, comprising:

receiving, by a transceiver, packet streams, and multiplexing the packet streams into a first multiplexed packet stream;

storing in memory the first multiplexed packet stream together with time indications;

receiving a retransmission request and selecting data for retransmission;

multiplexing the first multiplexed packet stream and the data for retransmission into a second multiplexed packet stream;

utilizing the time indications for calculating delays added to packets of the second multiplexed packet stream as a result of fulfilling the retransmission request;

adding the calculated delays to at least some of the packets of the second multiplexed packet stream; and

transmitting, by the transceiver, the second multiplexed packet stream.

17. The method of claim 16, wherein the retransmission request is received from a second transceiver to which the data for retransmission was already transmitted by the transceiver.

18. The method of claim 16, wherein the memory is a shared memory, and the data for retransmission is selected from the first multiplexed packet stream stored in the memory.

19. The method of claim 16, further comprising receiving link management packets, and multiplexing the link management packets into the second multiplexed packet stream.