METHOD AND APPARATUS FOR IMPROVING PERFORMANCE OF ERASURE SEQUENCE DETECTION

• US 20090161606A1
• Filed: 12/19/2007
• Published: 06/25/2009
• Est. Priority Date: 12/19/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ji, Tingfang, Tsai, Ming-Chang, Akkarakaran, Sony John
• Granted Patent: US 8,804,627 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 9/3247 involving digital signatures
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 72/04 Wireless resource allocation

Abstract

Attributes of access terminals are employed in determining durations for erasure sequences. Transmissions from access terminals are analyzed to determine different attributes are based at least ont these attributes traffic models are estimated. Those terminals whose traffic models tend towards more frequent occurrences of longer erasures are assigned longer erasure durations to improve performance in erasure sequence detection.

Claims

1. A method of transmission that facilitates erasure detection, comprising:

receiving one or more communications from an access terminal;

estimating one or more attributes associated with the access terminal;

assigning an erasure sequence duration based at least on the estimated attributes; and

communicating the assigned duration to the access terminal.

2. The method of claim 1, further comprising communicating the assigned erasure sequence duration in a message assigning resource to the access terminal.

3. The method of claim 2, wherein the assignment is a sticky assignment.

4. The method of claim 1, wherein the one or more attributes relate to one or more of a bandwidth assignment size, the access terminal'"'"'s received signal strength, and the access terminal'"'"'s traffic model.

5. The method of claim 4, wherein the one or more estimated attributes are associated with the bandwidth size assigned to the access terminal and wherein a shorter erasure sequence duration is assigned if the access terminal is associated with higher bandwidth, while a longer erasure sequence duration is assigned if the access terminal is associated with lower bandwidth.

6. The method of claim 4, wherein the one or more attributes are associated with the access terminal'"'"'s received signal strength, and wherein a shorter erasure sequence duration is assigned if the access terminal has higher signal strength, while a longer erasure sequence duration is assigned if the access terminal has lower signal strength.

7. The method of claim 4, wherein the one or more attributes are associated with the access terminal'"'"'s traffic model, and wherein the access terminal is assigned a longer erasure sequence duration if the access terminal is associated with a traffic model having more frequent occurrences of longer erasures, while the access terminal is assigned a shorter erasure sequence duration if the traffic model has infrequent occurrences of longer erasures.

8. The method of claim 1, further comprising monitoring burst statistics of the access terminal to determine the appropriate erasure sequence duration for assignment.

9. The method of claim 8, wherein the monitoring burst statistics further comprises:

computing a histogram that shows probabilities of occurrences of bursts of consecutive erasures of different lengths; and

computing a mean burst length.

10. The method of claim 8, further comprising:

assigning the erasure sequence duration such that an average value of the access terminal'"'"'s latency due to the assigned erasure sequence duration remains constant.

11. The method of claim 1, further comprising monitoring one or more QoS flows of the access terminal to determine the appropriate erasure sequence duration for assignment.

12. The method of claim 11, wherein the monitoring one or more QoS flows further comprises monitoring a plurality of QoS flows are associated with the access terminal implementing MIMO (multiple input multiple output) or SIMO (single input multiple output) communications such that different QoS flows are assigned different erasure sequence durations.

13. The method of claim 1, further comprising monitoring the access terminal for variations in attributes and reassigning the erasure sequence duration if the one or more attributes vary beyond a predetermined range.

14. An apparatus for improving erasure sequence detection, comprising:

a communications component that facilitates information exchange with one or more access terminals;

an estimation component that estimates one or more attributes associated with the access terminals via the communications received from the access terminals; and

an assigning component that assigns erasure sequence durations to each of the one or more access terminals based on their respective attributes.

15. The apparatus of claim 14, wherein information received from the access terminals relates to one or more of respective capabilities, estimates of respective downlink channel conditions, and subscriber data associated with each of the access terminals.

16. The apparatus of claim 14, wherein the estimation component obtains an estimate of one or more of a bandwidth size to be assigned to the access terminals, signal strengths of the access terminals, and a traffic model associated with the access terminals.

17. The apparatus of claim 14, further comprising a resource assignment message transmitted from the communication component to an access terminal, wherein the resource assignment message comprises assigned erasure sequence durations.

18. The apparatus of claim 17, wherein the assignment is a sticky assignment.

19. The apparatus of claim 18, wherein the resource assignment message is a group assignment message transmitted to a group comprising at least one of the one or more access terminals and the resource assignment message conveys information regarding resources assigned to the group.

20. The apparatus of claim 14, wherein the assigning component further employs current context data obtained from received transmissions or historical data associated with users employing the access terminals to determine durations of erasure sequences.

21. The apparatus of claim 14, wherein at least one of the one or more access terminals comprises a plurality of antennas that implement at least one of MIMO and SIMO schemes for communications.

22. The apparatus of claim 21, wherein the at least one access terminal implementing one of MIMO and SIMO schemes transmits a plurality of data streams from the plurality of antennas, and wherein the plurality of data streams are associated with different QoS parameters.

23. The apparatus of claim 22, wherein the assigning component assigns different values of erasure sequence durations to each of the plurality of data streams that have been assigned resources in sticky assignments.

24. The apparatus of claim 14, wherein the estimation component tracks variations in the one or more attributes of the access terminals and the assigning component varies erasure sequence durations to the access terminals based on respective variations in the one or more attributes.

25. A processor readable medium comprising:

instructions for causing a processor to receive one or more communications from an access terminal;

instructions for causing a processor to estimate one or more attributes associated with the access terminal; and

instructions for causing a processor to assign an erasure sequence duration based on the estimated attributes.

26. The processor readable medium of claim 25, further comprising instructions for causing a processor to communicate the assigned erasure sequence duration in a message assigning resources to the access terminal.

27. The processor readable medium of claim 26, further comprising instructions for causing a processor to assign the resources to the access terminal for a predetermined period.

28. The processor readable medium of claim 25, wherein the one or more attributes relate to one or more of a bandwidth assignment size, the access terminal'"'"'s received signal strength, and the access terminal'"'"'s traffic model.

29. The processor readable medium of claim 28, wherein the one or more estimated attributes are associated with the bandwidth size assigned to the access terminal, and wherein the erasure sequence duration is assigned so that if the access terminal has higher bandwidth, a shorter erasure sequence duration is assigned to the access terminal, while if the access terminal is associated with lower bandwidth, a longer erasure sequence duration is assigned.

30. The processor readable medium of claim 28, wherein the one or more attributes are associated with the access terminal'"'"'s received signal strength, and wherein the access terminal is assigned a shorter erasure sequence duration if the access terminal has higher signal strength while the access terminal is assigned a longer erasure sequence duration if the signal strength of the access terminal is low.

31. The processor readable medium of claim 28, wherein the one or more attributes are associated with the access terminal'"'"'s traffic model, and wherein the access terminal is assigned a longer erasure sequence duration if the traffic model of the access terminal is associated with more frequent occurrences of longer erasures, while the access terminal is assigned a shorter erasure sequence duration if the access terminal'"'"'s traffic model is associated with infrequent occurrences of longer erasures.

32. The processor readable medium of claim 28, further comprising instructions for causing a processor to monitor burst statistics of a user to determine the appropriate erasure sequence duration for assignment.

33. The processor readable medium of claim 32, wherein the monitoring burst statistics comprise:

computing a histogram that shows the probabilities of occurrences of bursts of consecutive erasures of different lengths; and

computing a mean burst length.

34. The processor readable medium of claim 32, further comprising instructions for causing a processor to assign the erasure sequence duration such that there is no change in an average value of the access terminal'"'"'s latency due to the assigned erasure sequence duration.

35. The processor readable medium of claim 25, further comprising instructions for causing a processor to monitor one or more QoS flows of the access terminal to determine appropriate erasure sequence duration for assignment.

36. The processor readable medium of claim 35, wherein the monitoring one or more QoS flows comprises monitoring a plurality of QoS flows associated with the access terminal implementing MIMO (multiple input multiple output) or SIMO (single input multiple output) communications such that different QoS flows are assigned different erasure sequence durations.

37. The processor readable medium of claim 25, further comprising instructions for causing a processor to monitor the access terminal for variations in attributes and reassigning the erasure sequence duration if the one or more attributes vary beyond a predetermined range.

38. An apparatus for improving erasure sequence detection, comprising:

means for communication configured to facilitate communications with one or more access terminals; and

means for processing configured to estimate one or more attributes associated with the access terminals via the communications received from the access terminals and assigns erasure sequence durations to each of the one or more access terminals based on their respective attributes.

39. The apparatus of claim 38, wherein information received from the access terminals relates to one or more of respective capabilities, estimates of respective downlink channel conditions, and subscriber data associated with each of the access terminals.

40. The apparatus of claim 38, wherein the means for processing obtains an estimate of one or more of a bandwidth size to be assigned, a signal strength, and a traffic model associated with the access terminals.

41. The apparatus of claim 38, wherein a resource assignment message is transmitted from the means for communication to at least one of the one or more access terminals, and wherein the resource assignment message comprises assigned erasure sequence durations.

42. The apparatus of claim 41, wherein the assignment is a sticky assignment.

43. The apparatus of claim 38, wherein the resource assignment message is a group assignment message transmitted to a group comprising at least one of the one or more access terminals, the resource assignment message conveying information regarding resources assigned to the group.

44. The apparatus of claim 38, wherein the means for processing employs current context data from received transmissions or historical data associated with users employing the access terminals to determine the erasure sequences durations.

45. The apparatus of claim 38, wherein at least one of the one or more access terminals implements at least one of MIMO and SIMO for communications.

46. The apparatus of claim 45, wherein the at least one access terminal implementing one of MIMO and SIMO transmits a plurality of data streams, the data streams being associated with different QoS parameters.

47. The apparatus of claim 46, wherein the means for processing assigns different values of erasure sequence durations to each of the plurality of data streams that have been assigned resources in sticky assignments.

48. The apparatus of claim 38, wherein the means for processing tracks variations in the one or more attributes of the access terminals and varies erasure sequence durations to the access terminals based on respective variations in the one or more attributes.

49. A method of communication that facilitates erasure detection, comprising:

transmitting one or more attributes;

receiving durations for erasure sequences, the durations being determined based on the transmitted one or more attributes; and

transmitting data packets alternated with erasure sequences of the received durations.

50. The method of claim 49, wherein the erasure sequence durations are received in a message conveying information regarding resource assignments to an associated access terminal.

51. The method of claim 49, wherein the assignment is a sticky assignment.

52. The method of claim 49, further comprising varying the erasure sequence durations while transmitting the data packets based on variations in the one or more attributes.

53. The method of claim 49, further comprising implementing one of MIMO and SIMO system at the access terminal such that data streams with different attributes transmit data packets with erasure sequences of different durations based on respective attributes of the data streams.

54. An apparatus for improving erasure sequence detection, comprising:

one or more communication components associated with an access terminal to transmit/receive information, wherein the communication components transmit one or more attributes associated with the access terminal; and

a processing component that receives durations for erasure sequences from an access point, the durations for erasure sequences being determined based on the one or more attributes.

55. The apparatus of claim 54, wherein the erasure sequences durations are received in a resource assignment message that conveys assignment of resources to the access terminal.

56. The apparatus of claim 55, wherein the assignment is a sticky assignment.

57. The apparatus of claim 54, wherein a plurality of the communication components transmit a plurality of data streams and the processing component processes data packets such that the data packets of different data streams are each alternated with respective received erasure sequences of different durations, based on attributes associated with respective data streams.

58. A processor readable medium comprising:

instructions for causing a processor to transmit one or more attributes associated with an access terminal;

instructions for causing a processor to receive durations for erasure sequences, the durations being determined based at least on the transmitted one or more attributes; and

instructions for causing a processor to transmit data packets alternated with erasure sequences of the received durations.

59. The processor readable medium of claim 58, wherein the erasure sequence durations are received in a message conveying information regarding resource assignments to the access terminal.

60. The processor readable medium of claim 59, wherein the assignment is a sticky assignment.

61. The processor readable medium of claim 60, further comprising instructions for causing a processor to vary the erasure sequence durations based on variations in the one or more attributes.

62. An apparatus for improving erasure sequence detection, comprising:

means for communication configured to transmit or receive information, transmit one or more attributes associated with the access terminal and receive erasure sequence durations, wherein the erasure sequences durations are determined based at least on the one or more transmitted attributes; and

means for processing configured to employ the received durations in generating erasure sequences for transmission.

63. The apparatus of claim 62, wherein the erasure sequences durations are received in a resource assignment message that conveys assignment of resources to the access terminal.

64. The apparatus of claim 63, wherein the assignment is a sticky assignment.

65. The apparatus of claim 62, wherein the means for communication is further configured to transmit a plurality of data streams, and wherein the means for processing processes data packets such that data packets of different data streams are alternated with erasure sequences of different durations based at least on attributes associated with respective data streams.

66. The apparatus of claim 62, wherein the means for communication is further configured to transmit data packets alternated with erasure sequences of the determined durations.