Method and apparatus for efficiently utilizing HARQ processes for semi-persistent and dynamic data transmissions

• US 10,305,641 B2
• Filed: 01/26/2015
• Issued: 05/28/2019
• Est. Priority Date: 03/10/2008
• Status: Active Grant

• Current Assignee: Interdigital Holdings Incorporated (InterDigital, Inc.)
• Original Assignee: Interdigital Holdings Incorporated (InterDigital, Inc.)
• Inventors: Wang, Jin, Zhang, Guodong
• Primary Examiner(s): Truong, Loan L. T.
• Application Number:
  US14/605,562
• Publication Number:
  US 20150139155A1
• Time in Patent Office: 1,583 Days
• CPC Class Codes: A61P 25/00 Drugs for disorders of the nervous system
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support

Abstract

A method and apparatus are disclosed for efficient hybrid automatic repeat request (HARQ) process utilization for semi-persistent and dynamic data transmissions, wherein a reserved HARQ process identification (ID) can be reused. A subset of a plurality of HARQ process IDs is reserved to use for a semi-persistent allocation, and data is transmitted based on the semi-persistent allocation. A dynamic allocation is received via a physical downlink control channel (PDCCH). At least one of the reserved HARQ process IDs is selectively used for transmitting data based on the dynamic allocation.

Claims

1. A method of controlling an allocation of hybrid automatic repeat request (HARQ) resources during a semi-persistent scheduling session for a wireless transmit/receive unit (WTRU), the method comprising:

reserving a subset of a plurality of HARQ process identifications (IDs) for semi-persistent scheduling;

determining a first HARQ process ID from the subset of the plurality of HARQ process IDs for a first downlink (DL) transmission associated with an allocation of a semi-persistent resource, the first HARQ process ID being based on at least a system frame number (SFN);

receiving first semi-persistently scheduled data associated with the first HARQ process ID via the allocated semi-persistent resource;

receiving a dynamic allocation associated with the first HARQ process ID via a physical downlink control channel (PDCCH) after the first semi-persistently scheduled data has been successfully received;

attempting to receive dynamically allocated data associated with the first HARQ process ID in accordance with the dynamic allocation;

suspending HARQ processing of the dynamically allocated data upon reaching a subsequent transmission opportunity associated with the semi-persistent resource that utilizes the first HARQ process ID; and

receiving second semi-persistently scheduled data associated with the first HARQ process ID via the allocated semi-persistent resource.

2. The method of claim 1, further comprising receiving an activation message for the allocation of the semi-persistent resource via the PDCCH.

3. The method of claim 2, wherein the activation message does not include the first HARQ process ID.

4. The method of claim 1, further comprising:

sending an acknowledgment indicating receipt of at least one of the first and second semi-persistently scheduled data.

5. The method of claim 1, wherein the first HARQ process ID is based on at least a plurality of SFNs.

6. The method of claim 1, further comprising determining a second HARQ process ID for a second DL transmission associated with an allocation of a non-semi-persistent resource based on the second HARQ process ID being received in the allocation of the non-semi-persistent resource.

7. The method of claim 6, wherein the allocation of the non-semi-persistent resource is received via the PDCCH.

8. The method of claim 1, further comprising receiving a radio resource control (RRC) message, the RRC message including a configuration for the subset of the plurality of HARQ process IDs.

9. The method of claim 1, wherein the first HARQ process ID is used after all unreserved HARQ process IDs have been used.

10. The method of claim 1, wherein the subset of the plurality of HARQ process IDs are used by high priority services.

11. A wireless transmit/receive unit (WTRU), the WTRU comprising:

a processor configured at least to;

reserve a subset of a plurality of hybrid automatic repeat request (HARQ) process identifications (IDs) for semi-persistent scheduling;

determine a first HARQ process ID from the subset of the plurality of HARQ process IDs for a first downlink (DL) transmission associated with an allocation of a semi-persistent resource, the first HARQ process ID being based on at least a system frame number (SFN);

receive first semi-persistently scheduled data associated with the first HARQ process ID via the allocated semi-persistent resource;

receive a dynamic allocation associated with the first HARQ process ID via a physical downlink control channel (PDCCH) after the first semi-persistently scheduled data has been successfully received;

attempt to receive dynamically allocated data associated with the first HARQ process ID in accordance with the dynamic allocation;

suspend HARQ processing of the dynamically allocated data upon reaching a subsequent transmission opportunity associated with the semi-persistent resource that utilizes the first HARQ process ID; and

receive second semi-persistently scheduled data associated with the first HARQ process ID via the allocated semi-persistent resource.

12. The WTRU of claim 11, wherein the processor is further configured to receive an activation message for the allocation of the semi-persistent resource via the PDCCH.

13. The WTRU of claim 12, wherein the activation message does not include the first HARQ process ID.

14. The WTRU of claim 11, wherein the processor is further configured to send an acknowledgment indicating receipt of at least one of the first and second semi-persistently scheduled data.

15. The WTRU of claim 11, wherein the first HARQ process ID is based on at least a plurality of SFNs.

16. The WTRU of claim 11, wherein the processor is further configured to determine a second HARQ process ID for a second DL transmission associated with an allocation of a non-semi-persistent resource based on the second HARQ process ID being received in the allocation of the non-semi-persistent resource.

17. The WTRU of claim 16, wherein the processor is further configured to receive the allocation of the non-semi-persistent resource via the PDCCH.

18. The WTRU of claim 11, wherein the processor is further configured to receive a radio resource control (RRC) message, the RRC message including a configuration for the subset of the plurality of HARQ process IDs.

19. The WTRU of claim 11, wherein the processor is further configured such that the first HARQ process ID is used after all unreserved HARQ process IDs have been used.

20. The WTRU of claim 11, wherein the processor is further configured such that the subset of the plurality of HARQ process IDs are used by high priority services.