Discarding of hybrid automatic repeat request (HARQ) processes

• US 9,369,242 B2
• Filed: 12/23/2013
• Issued: 06/14/2016
• Est. Priority Date: 12/23/2013
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Yang, Ming, Chin, Tom, Shi, Guangming
• Primary Examiner(s): Harper, Kevin C
• Assistant Examiner(s): Rose, Derrick V
• Application Number:
  US14/139,741
• Publication Number:
  US 20150180613A1
• Time in Patent Office: 904 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1896 ARQ related signaling

Abstract

A method of wireless communication includes receiving an uplink grant for one or more pending HARQ processes waiting to perform a retransmission. The method also includes selecting each pending HARQ process that has not received a NACK. The method further includes terminating an oldest selected HARQ process when the uplink grant is insufficient to perform the retransmission for the plurality of pending HARQ processes.

Claims

1. A method of wireless communication, comprising:

receiving an uplink grant for a plurality of pending hybrid automatic repeat request (HARQ) processes waiting to perform a retransmission;

selecting each pending HARQ process that has not received a negative acknowledgment (NACK); and

terminating an oldest selected HARQ process when an uplink transmission power identified in the uplink grant is insufficient to perform the retransmission for the plurality of pending HARQ processes.

2. The method of claim 1, further comprising discarding an oldest HARQ process that has received the NACK when all HARQ processes have received the NACK.

3. The method of claim 1, in which a UE has not received the NACK because an acknowledgement (ACK)/NACK message is transmitted on a feedback channel that is received in a measurement gap or tune away gap.

4. The method of claim 1, in which a UE has not received the NACK because the NACK has not yet arrived.

5. The method of claim 1, further comprising determining whether the uplink grant is insufficient to perform the retransmission for the plurality of pending HARQ processes.

6. An apparatus for wireless communication, the apparatus comprising:

a memory unit; and

at least one processor coupled to the memory unit;

the at least one processor being configured;

to receive an uplink grant for a plurality of pending hybrid automatic repeat request (HARQ) processes waiting to perform a retransmission;

to select each pending HARQ process that has not received a negative acknowledgment (NACK); and

to terminate an oldest selected HARQ process when an uplink transmission power identified in the uplink grant is insufficient to perform the retransmission for the plurality of pending HARQ processes.

7. The apparatus of claim 6, in which the at least one processor is further configured to discard an oldest HARQ process that has received the NACK when all HARQ processes have received the NACK.

8. The apparatus of claim 6, in which a UE has not received the NACK because an acknowledgement (ACK)/NACK message is transmitted on a feedback channel that is received in a measurement gap or tune away gap.

9. The apparatus of claim 6, in which a UE has not received the NACK because the NACK has not yet arrived.

10. The apparatus of claim 6, in which the at least one processor is further configured to determine whether the uplink grant is insufficient to perform the retransmission for the plurality of pending HARQ processes.

11. An apparatus for wireless communication, the apparatus comprising:

means for receiving an uplink grant for a plurality of pending hybrid automatic repeat request (HARQ) processes waiting to perform a retransmission;

means for selecting each pending HARQ process that has not received a negative acknowledgment (NACK); and

means for terminating an oldest selected HARQ process when an uplink transmission power identified in the uplink grant is insufficient to perform the retransmission for the plurality of pending HARQ processes.

12. The apparatus of claim 11, further comprising means for discarding an oldest HARQ process that has received the NACK when all HARQ processes have received the NACK.

13. The apparatus of claim 11, in which a UE has not received the NACK because an acknowledgement (ACK)/NACK message is transmitted on a feedback channel that is received in a measurement gap or tune away gap.

14. The apparatus of claim 11, in which a UE has not received the NACK because the NACK has not yet arrived.

15. The apparatus of claim 11, further comprising means for determining whether the uplink grant is insufficient to perform the retransmission for the plurality of pending HARQ processes.

16. A non-transitory computer-readable medium having program code recorded thereon, the program code comprising:

program code to receive an uplink grant for a plurality of pending hybrid automatic repeat request (HARQ) processes waiting to perform a retransmission;

program code to select each pending HARQ process that has not received a negative acknowledgment (NACK); and

program code to terminate an oldest selected HARQ process when an uplink transmission power identified in the uplink grant is insufficient to perform the retransmission for the plurality of pending HARQ processes.

17. The computer-readable medium of claim 16, in which the program code further comprises program code to discard an oldest HARQ process that has received the NACK when all HARQ processes have received the NACK.

18. The computer-readable medium t of claim 16, in which a UE has not received the NACK because an acknowledgement (ACK)/NACK message is transmitted on a feedback channel that is received in a measurement gap or tune away gap.

19. The computer-readable medium of claim 16, in which a UE has not received the NACK because the NACK has not yet arrived.

20. The computer-readable medium of claim 16, in which the program code further comprises program code to determine whether the uplink grant is insufficient to perform the retransmission for the plurality of pending HARQ processes.