Dynamic assignment of ACK resource in a wireless communication system

Patent metadata

Field	Value
Publication number	US-9439212-B2
Application number	US-201514679967-A
Country	US
Kind code	B2
Filing date	Apr 6, 2015
Priority date	Mar 28, 2008
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

Techniques for dynamically assigning acknowledgement (ACK) resource to a user equipment (UE) are described. For dynamic scheduling, a scheduling message may be used to send scheduling information for a single transmission of data. For semi-persistent scheduling, a scheduling message may be used to send a semi-persistent assignment for multiple transmissions of data. In an aspect, at least one field of a scheduling message, which is normally used to carry scheduling information for dynamic scheduling, may be re-used to carry an ACK resource assignment for semi-persistent scheduling. In one design, a UE may receive a scheduling message carrying a semi-persistent assignment and may obtain an assignment of ACK resource from the at least one field of the scheduling message. The UE may receive a transmission of data sent in accordance with the semi-persistent assignment, determine ACK information for the transmission of data, and send the ACK information with the ACK resource.

First claim

What is claimed is:

1. A method for wireless communication at a user equipment (UE), comprising:
receiving a scheduling message according to a message format that is associated with both semi-persistent assignments that are valid for multiple transmissions of data and dynamic assignments that are valid for single transmissions of data, wherein the message format comprises a new data indicator field that,
for the dynamic assignments, carries information used in processing transmissions associated with the dynamic assignments, and
for the semi-persistent assignments, is set to a designated value for validation of the semi-persistent assignments;

validating that the received scheduling message comprises a semi-persistent assignment based at least in part on a comparison of the new data indicator field to the designated value;
obtaining an assignment of a first acknowledgement (ACK) resource from a transmit power control (TPC) field of the scheduling message for the semi-persistent assignment;
receiving the multiple transmissions of data sent in accordance with the semi-persistent assignment;
determining first ACK information for a first transmission of data of the multiple transmissions of data; and
sending the first ACK information on the first ACK resource.

2. The method of claim 1 , wherein the message format further comprises one or more of: a hybrid automatic repeat request (HARQ) field, a redundancy version field, a resource block assignment field, or a modulation and coding scheme (MCS) field.

3. The method of claim 1 , further comprising:
detecting the scheduling message based on a semi-persistent scheduling cell radio network temporary identifier assigned to the UE that is different from a cell radio network temporary identifier assigned to the UE for detection of the dynamic assignments.

4. The method of claim 1 , further comprising:
receiving a dynamic assignment for a retransmission of the first transmission of data in a second scheduling message in response to indicating that the first transmission of data was decoded in error in the first ACK information; and
receiving the retransmission of the first transmission of data according to the dynamic assignment.

5. The method of claim 4 , further comprising:
obtaining a second assignment of a second ACK resource based on a resource used to send the second scheduling message; and
determining second ACK information for the retransmission of the first transmission of data; and
sending the second ACK information on the second ACK resource.

6. The method of claim 1 , wherein the scheduling message comprising the semi-persistent assignment is received on a physical downlink control channel (PDCCH) and the multiple transmissions of data are received on a physical downlink shared channel (PDSCH).

7. The method of claim 1 , further comprising:
receiving a semi-persistent scheduling interval for the multiple transmissions of data via upper layer signaling.

8. The method of claim 1 , wherein the designated value comprises all zeros.

9. The method of claim 2 , wherein one or more of the HARQ field, the redundancy version field, the resource block assignment field, the MCS field, or the TPC command field are set to designated values for the validation of the semi-persistent assignments.

10. A method for wireless communication, comprising:
mapping, according to a message format that is associated with both semi-persistent assignments that are valid for multiple transmissions of data and dynamic assignments that are valid for single transmissions of data, scheduling information for a semi-persistent assignment to a scheduling message intended for a user equipment (UE), wherein the message format comprises a new data indicator field that,
for the dynamic assignments, carries information used in processing transmissions associated with the dynamic assignments, and
for the semi-persistent assignments, is set to a designated value for validation of the semi-persistent assignments;

mapping the new data indicator field to a designated value, wherein the designated value indicates that the scheduling message comprises a semi-persistent assignment;
mapping an assignment of a first acknowledgement (ACK) resource to a transmit power control (TPC) command field of the scheduling message for the semi-persistent assignment;
sending the scheduling message to the UE;
sending the multiple transmissions of data to the UE according to the semi-persistent assignment; and
receiving first ACK information on the first ACK resource.

11. The method of claim 10 , wherein the message format further comprises one or more of: a hybrid automatic repeat request (HARQ) field, a redundancy version field, a resource block assignment field, or a modulation and coding scheme (MCS) field.

12. The method of claim 10 , further comprising:
scrambling the scheduling message using a semi-persistent scheduling cell radio network temporary identifier assigned to the UE that is different from a cell radio network temporary identifier assigned to the UE for detection of the dynamic assignments.

13. The method of claim 12 , wherein the scrambling the scheduling message using the semi-persistent scheduling cell radio network temporary identifier assigned to the UE comprises scrambling a cyclic redundancy check (CRC) associated with the scheduling message with the semi-persistent scheduling cell radio network temporary identifier assigned to the UE.

14. The method of claim 12 , wherein the
first ACK information indicates that a first transmission of data of the multiple transmissions of data was decoded in error, the method further comprising:
sending a dynamic assignment for a retransmission of the first transmission of data in a second scheduling message to the UE; and
sending the retransmission to the UE according to the dynamic assignment.

15. The method of claim 14 , further comprising:
receiving second ACK information associated with the retransmission on a second ACK resource determined based on a resource used to send the second scheduling message.

16. The method of claim 10 , wherein the scheduling message comprising the semi-persistent assignment is sent on a physical downlink control channel (PDCCH) and the multiple transmissions of data are sent on a physical downlink shared channel (PDSCH).

17. The method of claim 10 , further comprising:
sending a semi-persistent scheduling interval for the multiple transmissions of data to the UE via upper layer signaling.

18. The method of claim 10 , wherein the designated value comprises all zeros.

19. The method of claim 11 , wherein one or more of the HARQ field, the redundancy version field, the resource block assignment field, the MCS field, or the TPC command field are set to designated values for the validation of the semi-persistent assignments.

20. An apparatus for wireless communication at a user equipment (UE), comprising:
at least one processor;
a memory coupled to the at least one processor, the memory comprising instructions that, when executed by the at least one processor, cause the at least one processor to:
receive a scheduling message according to a message format that is associated with both semi-persistent assignments that are valid for multiple transmissions of data and dynamic assignments that are valid for single transmissions of data, wherein the message format comprises a new data indicator field that,
for the dynamic assignments, carries information used in processing transmission associated with the

Assignees

• Qualcomm Inc

Inventors

• Damnjanovic Aleksandar
• Damnjanovic Jelena
• Montojo Juan

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L1/1607 Primary

  Details of the supervisory signal · CPC title

• H04L1/1861

  Physical mapping arrangements (for ACK signaling see also H04L5/0053) · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L5/0091

  Signalling for the administration of the divided path, e.g. signalling of configuration information · CPC title