METHOD AND APPARATUS FOR JOINT HARQ AND DRX OPTIMIZATION FOR LOW COST MTC DEVICES

• US 20130308465A1
• Filed: 05/16/2013
• Published: 11/21/2013
• Est. Priority Date: 05/18/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: XU, Hao, CHEN, Wanshi, GAAL, Peter
• Granted Patent: US 9,374,845 B2
• Time in Patent Office: Days
• US Class Current: 370/241
• CPC Class Codes: H04L 47/27 Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Abstract

A method for wireless communication may include a mobile entity receiving a timing indicator for a discontinuous reception (DRX) cycle during a DRX mode, and adjusting at least an acknowledgement timing in response to receiving the timing indicator for the DRX cycle. A base station in communication with the mobile entity may provide a timing indicator for a DRX cycle during a DRX mode to the mobile entity, transmit at least one of downlink (DL) data or an uplink (UL) grant indicator to the mobile entity at a first time, and waiting from the first time for a time period indicated by the timing indicator before receiving at least one of an acknowledgement of the DL data or UL data responsive to the UL grant from the mobile entity.

Claims

1. A method for wireless communication comprising:

receiving a timing indicator for a discontinuous reception (DRX) cycle during a DRX mode; and

adjusting at least an acknowledgement timing in response to receiving the timing indicator for the DRX cycle.

2. The method of claim 1, further comprising at least one of receiving and transmitting an acknowledgment based on an adjusted acknowledgement timing.

3. The method of claim 1, wherein the acknowledgement timing comprises at least one of a hybrid automatic repeat request (HARQ) timing or a higher layer retransmission acknowledgement timing.

4. The method of claim 1, further comprising monitoring one of a downlink (DL) and uplink (UL) grant for the timing indicator during a DRX ON cycle.

5. The method of claim 1, further comprising receiving the timing indicator in a physical downlink control channel (PDCCH) or evolved PDCCH (ePDCCH).

6. The method of claim 1, wherein the timing indicator is associated with a traffic transmission.

7. The method of claim 1, wherein the timing indicator is based on at least one of a system load, quality of service (QoS) level, and timing delay requirement.

8. The method of claim 1, further comprising receiving a set of timing indicators in at least one of a system information block (SIB) and radio resource control (RRC) signal, wherein the set of timing indicators comprises the timing indicator.

9. The method of claim 1, further comprising receiving the timing indicator in an RRC signal using a random access channel (RACH) procedure.

10. The method of claim 1, further comprising transmitting an acknowledgement timing capability to a network node, wherein the received timing indicator is based on the acknowledgement timing capability.

11. The method of claim 1, further comprising adjusting at least one of a transmission timing or retransmission timing in response to receiving the timing indicator for the DRX cycle.

12. The method of claim 1, further comprising:

switching from a first DRX cycle time to a second DRX cycle time based on the timing indicator; and

reverting to the first DRX cycle time after transmission of data.

13. A wireless communication apparatus comprising:

at least one processor configured to;

receive a timing indicator for a discontinuous reception (DRX) cycle during a DRX mode, and adjust at least an acknowledgement timing in response to receiving the timing indicator for the DRX cycle; and

a memory coupled to the at least one processor for storing data.

14. The apparatus of claim 13, wherein the processor is further configured to perform at least one of receiving and transmitting an acknowledgment based on an adjusted acknowledgement timing.

15. The apparatus of claim 13, wherein the processor is further configured to adjust the acknowledgement timing comprising at least one of a hybrid automatic repeat request (HARQ) timing or a higher layer retransmission acknowledgement timing.

16. The apparatus of claim 13, wherein the processor is further configured to monitor one of a downlink (DL) and uplink (UL) grant for the timing indicator during a DRX ON cycle.

17. The apparatus of claim 13, wherein the processor is further configured to receive the timing indicator in a physical downlink control channel (PDCCH) or evolved PDCCH (ePDCCH).

18. The apparatus of claim 13, wherein the processor is further configured to receive the timing indicator associated with a traffic transmission.

19. The apparatus of claim 13, wherein the processor is further configured to receive the timing indicator is based on at least one of a system load, quality of service (QoS) level, and timing delay requirement.

20. The apparatus of claim 13, wherein the processor is further configured to receive a set of timing indicators in at least one of a system information block (SIB) and radio resource control (RRC) signal, wherein the set of timing indicators comprises the timing indicator.

21. The apparatus of claim 13, wherein the processor is further configured to receive the timing indicator in an RRC signal using a random access channel (RACH) procedure.

22. The apparatus of claim 13, wherein the processor is further configured to transmit an acknowledgement timing capability to a network node, wherein the received timing indicator is based on the acknowledgement timing capability.

23. The apparatus of claim 13, wherein the processor is further configured to adjust at least one of a transmission timing or retransmission timing in response to receiving the timing indicator for the DRX cycle.

24. The apparatus of claim 13, wherein the processor is further configured to:

switch from a first DRX cycle time to a second DRX cycle time based on the timing indicator; and

revert to the first DRX cycle time after transmission of data.

25. A wireless communication apparatus comprising:

means for receiving a timing indicator for a discontinuous reception (DRX) cycle during a DRX mode; and

means for adjusting at least an acknowledgement timing in response to receiving the timing indicator for the DRX cycle.

26. A computer program product, comprising:

a computer-readable medium comprising code for causing at least one computer to;

receive a timing indicator for a discontinuous reception (DRX) cycle during a DRX mode; and

adjust at least an acknowledgement timing in response to receiving the timing indictor for the DRX cycle.

27. A method for wireless communication comprising:

providing a timing indicator for a discontinuous reception (DRX) cycle during a DRX mode to a mobile entity;

transmitting at least one of downlink (DL) data or an uplink (UL) grant indicator to the mobile entity at a first time; and

waiting from the first time for a time period indicated by the timing indicator before receiving at least one of an acknowledgement of the DL data or UL data responsive to the UL grant from the mobile entity.

28. The method of claim 27, further comprising determining the timing indicator based on a delay sensitivity of the mobile entity.

29. The method of claim 27, further comprising providing the timing indicator configured as at least one of a hybrid automatic repeat request (HARQ) timing indicator or a higher layer retransmission acknowledgement timing indicator.

30. The method of claim 27, further comprising waiting for the time period after receiving the UL data before transmitting an acknowledgment for the UL data to the mobile entity.

31. The method of claim 27, further comprising transmitting the timing indicator in a physical downlink control channel (PDCCH) or evolved PDCCH (ePDCCH).

32. The method of claim 27, further comprising determining the timing indicator based on at least one of a system load, quality of service (QoS) level, and timing delay requirement.

33. The method of claim 27, further comprising transmitting a set of timing indicators in at least one of a system information block (SIB) and radio resource control (RRC) signal, wherein the set of timing indicators comprises the timing indicator.

34. The method of claim 27, further comprising transmitting the timing indicator in an RRC signal using a random access channel (RACH) procedure.

35. The method of claim 27, further comprising receiving an acknowledgement timing capability from the mobile entity, and determining the timing indicator at least in part based on the acknowledgement timing capability.

36. The method of claim 27, further comprising:

switching from a first DRX cycle time to a second DRX cycle time based on the timing indicator; and

reverting to the first DRX cycle time after transmission of data.

37. The method of claim 27, further comprising waiting from a time a negative acknowledgement (NACK) is received from the mobile entity for the time period before retransmitting the DL data to the mobile entity.

38. The method of claim 27, further comprising waiting from a time a negative acknowledgement (NACK) is provided to the mobile entity for the time period before receiving a retransmission of the UL data from the mobile entity.

39. A wireless communication apparatus comprising:

at least one processor configured to provide a timing indicator for a discontinuous reception (DRX) cycle during a DRX mode to a mobile entity, transmit at least one of downlink (DL) data or an uplink (UL) grant indicator to the mobile entity at a first time, and wait from the first time for a time period indicated by the timing indicator before receiving at least one of an acknowledgement of the DL data or UL data responsive to the UL grant from the mobile entity; and

a memory coupled to the at least one processor for storing data.

40. The apparatus of claim 39, wherein the at least one processor is further configured to determine the timing indicator based on a delay sensitivity of the mobile entity.

41. The apparatus of claim 39, wherein the at least one processor is further configured to provide the timing indicator configured as at least one of a hybrid automatic repeat request (HARQ) timing indicator or a higher layer retransmission acknowledgement timing indicator.

42. The apparatus of claim 39, wherein the at least one processor is further configured to wait for the time period after receiving the UL data before transmitting an acknowledgment for the UL data to the mobile entity.

43. The apparatus of claim 39, wherein the at least one processor is further configured to transmit the timing indicator in a physical downlink control channel (PDCCH) or evolved PDCCH (ePDCCH).

44. The apparatus of claim 39, wherein the at least one processor is further configured to determine the timing indicator based on at least one of a system load, quality of service (QoS) level, and timing delay requirement.

45. The apparatus of claim 39, wherein the at least one processor is further configured to transmit one or more timing indicators in at least one of a system information block (SIB) and radio resource control (RRC) signal in a random access channel (RACH) procedure, wherein the one or more timing indicators comprises the timing indicator.

46. The apparatus of claim 39, wherein the at least one processor is further configured to receive an acknowledgement timing capability from the mobile entity, and determining the timing indicator at least in part based on the acknowledgement timing capability.

47. The apparatus of claim 39, wherein the at least one processor is further configured to:

switch from a first DRX cycle time to a second DRX cycle time based on the timing indicator; and

revert to the first DRX cycle time after transmission of data.

48. The apparatus of claim 39, wherein the at least one processor is further configured to perform at least one of:

waiting from a time a negative acknowledgement (NACK) is received from the mobile entity for the time period before retransmitting the DL data to the mobile entity, or waiting from a time a negative acknowledgement (NACK) is provided to the mobile entity for the time period before receiving a retransmission of the UL data from the mobile entity.

49. A wireless communication apparatus comprising:

means for providing a timing indicator for a discontinuous reception (DRX) cycle during a DRX mode to a mobile entity;

means for transmitting at least one of downlink (DL) data or an uplink (UL) grant indicator to the mobile entity at a first time; and

means for waiting from the first time for a time period indicated by the timing indicator before receiving at least one of an acknowledgement of the DL data or UL data responsive to the UL grant from the mobile entity.

50. A computer program product, comprising:

a computer-readable medium comprising code for causing at least one computer to;

provide a timing indicator for a discontinuous reception (DRX) cycle during a DRX mode to a mobile entity, transmit at least one of downlink (DL) data or an uplink (UL) grant indicator to the mobile entity at a first time, and wait from the first time for a time period indicated by the timing indicator before receiving at least one of an acknowledgement of the DL data or UL data responsive to the UL grant from the mobile entity.