DELAY BASED ACTIVE QUEUE MANAGEMENT FOR UPLINK TRAFFIC IN USER EQUIPMENT

• US 20130250765A1
• Filed: 03/23/2012
• Published: 09/26/2013
• Est. Priority Date: 03/23/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ehsan, Navid, Klingenbrunn, Thomas
• Granted Patent: US 9,386,128 B2
• Time in Patent Office: Days
• US Class Current: 370/235
• CPC Class Codes: H04L 47/193 at the transport layer, e.g. TCP related
• CPC Class Codes: H04L 47/25 with rate being modified by the source upon detecting a change of network conditions
• 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 47/323 Discarding or blocking control packets, e.g. ACK packets
• CPC Class Codes: H04L 47/326 with random discard, e.g. random early discard [RED]
• CPC Class Codes: H04L 69/163 In-band adaptation of TCP data exchange; In-band control procedures
• CPC Class Codes: H04W 28/10 Flow control between communication endpoints
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]
• CPC Class Codes: H04W 80/06 Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless transmission control protocol/Internet protocol [TCP/IP] or user datagram protocol [UDP] H04L69/16

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus stores data packets in a buffer. In addition, the apparatus determines a delay of at least one data packet of the data packets in the buffer. Furthermore, the apparatus controls a TCP data flow rate based on the determined delay. The apparatus may also store ACKs in a second buffer and drop an ACK of the stored ACKs when one of a number of stored ACKs is greater than a first threshold or a size of the stored ACKs is greater than a second threshold.

Claims

1. A method of wireless communication, comprising:

storing data packets in a buffer;

determining a delay of at least one data packet of the data packets in the buffer; and

controlling a Transmission Control Protocol (TCP) data flow rate based on the determined delay.

2. The method of claim 1, further comprising maintaining an upper threshold, wherein the controlling the TCP data flow rate comprises decreasing the TCP data flow rate when the delay is greater than or equal to the upper threshold.

3. The method of claim 2, further comprising maintaining a lower threshold, wherein the controlling the TCP data flow rate comprises decreasing the TCP data flow rate until the delay is less than or equal to the lower threshold.

4. The method of claim 3, further comprising:

determining a requisite downlink (DL) data rate; and

adjusting the upper threshold and the lower threshold based on the determined requisite DL data rate.

5. The method of claim 1, wherein the controlling the TCP data flow rate comprises dropping random data packets in order to decrease the TCP data flow rate.

6. The method of claim 1, wherein the controlling the TCP data flow rate comprises marking random data packets in order to decrease the TCP data flow rate.

7. The method of claim 1, further comprising:

storing acknowledgements (ACKs) in a second buffer; and

dropping an ACK of the stored ACKs when one of a number of stored ACKs is greater than a first threshold or a size of the stored ACKs is greater than a second threshold.

8. The method of claim 7, wherein the ACK is dropped from the earliest stored ACKs upon determining that another ACK may be transmitted that contains information of the dropped ACK.

9. The method of claim 1, further comprising transmitting the data packets in the buffer with a varying uplink transmission rate.

10. The method of claim 1, further comprising inserting dummy packets into the buffer, wherein the delay is determined based on the inserted dummy packets.

11. An apparatus for wireless communication, comprising:

means for storing data packets in a buffer;

means for determining a delay of at least one data packet of the data packets in the buffer; and

means for controlling a Transmission Control Protocol (TCP) data flow rate based on the determined delay.

12. The apparatus of claim 11, further comprising means for maintaining an upper threshold, wherein the means for controlling the TCP data flow rate decreases the TCP data flow rate when the delay is greater than or equal to the upper threshold.

13. The apparatus of claim 12, further comprising means for maintaining a lower threshold, wherein the means for controlling the TCP data flow rate decreases the TCP data flow rate until the delay is less than or equal to the lower threshold.

14. The apparatus of claim 13, further comprising:

means for determining a requisite downlink (DL) data rate; and

means for adjusting the upper threshold and the lower threshold based on the determined requisite DL data rate.

15. The apparatus of claim 11, wherein the means for controlling the TCP data flow rate drops random data packets in order to decrease the TCP data flow rate.

16. The apparatus of claim 11, wherein the means for controlling the TCP data flow rate marks random data packets in order to decrease the TCP data flow rate.

17. The apparatus of claim 11, further comprising:

means for storing acknowledgements (ACKs) in a second buffer; and

means for dropping an ACK of the stored ACKs when one of a number of stored ACKs is greater than a first threshold or a size of the stored ACKs is greater than a second threshold.

18. The apparatus of claim 17, wherein the ACK is dropped from the earliest stored ACKs upon determining that another ACK may be transmitted that contains information of the dropped ACK.

19. The apparatus of claim 11, further comprising means for transmitting the data packets in the buffer with a varying uplink transmission rate.

20. The apparatus of claim 11, further comprising means for inserting dummy packets into the buffer, wherein the delay is determined based on the inserted dummy packets.

21. An apparatus for wireless communication, comprising:

a processing system configured to;

store data packets in a buffer;

determine a delay of at least one data packet of the data packets in the buffer; and

control a Transmission Control Protocol (TCP) data flow rate based on the determined delay.

22. The apparatus of claim 21, wherein the processing system is further configured to maintain an upper threshold, wherein the processing system is configured to control the TCP data flow rate by decreasing the TCP data flow rate when the delay is greater than or equal to the upper threshold.

23. The apparatus of claim 22, wherein the processing system is further configured to maintain a lower threshold, wherein the processing system is configured to control the TCP data flow rate by decreasing the TCP data flow rate until the delay is less than or equal to the lower threshold.

24. The apparatus of claim 23, wherein the processing system is further configured to:

determine a requisite downlink (DL) data rate; and

adjust the upper threshold and the lower threshold based on the determined requisite DL data rate.

25. The apparatus of claim 21, wherein the processing system is configured to control the TCP data flow rate by dropping random data packets in order to decrease the TCP data flow rate.

26. The apparatus of claim 21, wherein the processing system is configured to control the TCP data flow rate by marking random data packets in order to decrease the TCP data flow rate.

27. The apparatus of claim 21, wherein the processing system is further configured to:

store acknowledgements (ACKs) in a second buffer; and

drop an ACK of the stored ACKs when one of a number of stored ACKs is greater than a first threshold or a size of the stored ACKs is greater than a second threshold.

28. The apparatus of claim 27, wherein the ACK is dropped from the earliest stored ACKs upon determining that another ACK may be transmitted that contains information of the dropped ACK.

29. The apparatus of claim 21, wherein the processing system is further configured to transmit the data packets in the buffer with a varying uplink transmission rate.

30. The apparatus of claim 21, wherein the processing system is further configured to insert dummy packets into the buffer, wherein the delay is determined based on the inserted dummy packets.

31. A computer program product, comprising:

a computer-readable medium comprising code for;

storing data packets in a buffer;

determining a delay of at least one data packet of the data packets in the buffer; and

controlling a Transmission Control Protocol (TCP) data flow rate based on the determined delay.

32. The computer program product of claim 31, wherein the computer-readable medium further comprises code for maintaining an upper threshold, wherein the code for controlling the TCP data flow rate decreases the TCP data flow rate when the delay is greater than or equal to the upper threshold.

33. The computer program product of claim 32, wherein the computer-readable medium further comprises code for maintaining a lower threshold, wherein the code for controlling the TCP data flow rate decreases the TCP data flow rate until the delay is less than or equal to the lower threshold.

34. The computer program product of claim 33, wherein the computer-readable medium further comprises code for:

determining a requisite downlink (DL) data rate; and

adjusting the upper threshold and the lower threshold based on the determined requisite DL data rate.

35. The computer program product of claim 31, wherein the code for controlling the TCP data flow rate drops random data packets in order to decrease the TCP data flow rate.

36. The computer program product of claim 31, wherein the code for controlling the TCP data flow rate marks random data packets in order to decrease the TCP data flow rate.

37. The computer program product of claim 31, wherein the computer-readable medium further comprises code for:

storing acknowledgements (ACKs) in a second buffer; and

dropping an ACK of the stored ACKs when one of a number of stored ACKs is greater than a first threshold or a size of the stored ACKs is greater than a second threshold.

38. The computer program product of claim 37, wherein the ACK is dropped from the earliest stored ACKs upon determining that another ACK may be transmitted that contains information of the dropped ACK.

39. The computer program product of claim 31, wherein the computer-readable medium further comprises code for transmitting the data packets in the buffer with a varying uplink transmission rate.

40. The computer program product of claim 31, wherein the computer-readable medium further comprises code for inserting dummy packets into the buffer, wherein the delay is determined based on the inserted dummy packets.