METHOD AND APPARATUS FOR IMPROVEMENT OF TDD INTER-BAND CARRIER AGGREGATION IN A WIRELESS COMMUNICATION SYSTEM

• US 20130083708A1
• Filed: 09/28/2012
• Published: 04/04/2013
• Est. Priority Date: 09/30/2011
• Status: Active Grant

• Current Assignee: Innovative Sonic Limited
• Original Assignee: Innovative Sonic Limited
• Inventors: Lin, Ko-Chiang
• Granted Patent: US 10,673,602 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 72/04 Wireless resource allocation

Abstract

A method and apparatus for TDD inter-band carrier aggregation in a wireless communication system includes performing aggregating multiple cells with different TDD UL-DL configurations, transmitting a PUSCH transmission on a first cell, the subframe for HARQ feedback reception for the PUSCH in a first cell colliding with a UL subframe in a second cell, and performing one of setting the corresponding HARQ feedback to ACK, flushing the corresponding HARQ buffer, and changing the corresponding HARQ feedback subframe for the PUSCH to another subframe.

Claims

1. A method of Time Division Duplex (TDD) inter-band carrier aggregation in a wireless communication system comprising:

aggregating multiple cells with different Time Division Duplex (TDD) uplink (UL)-downlink (DL) configurations;

transmitting a Physical Uplink Share Channel (PUSCH) transmission on a first cell, the subframe for Hybrid Automatic Repeat and reQuest (HARQ) feedback reception, for the PUSCH in a first cell colliding with a UL subframe in a second cell; and

performing one of

setting the corresponding HARQ feedback to Acknowledge (ACK);

flushing the corresponding HARQ buffer; and

changing the corresponding HARQ feedback subframe for the PUSCH to another subframe.

2. The method of claim 1, further comprising performing UL transmission on the second cell when performing one of setting the corresponding HARQ feedback to ACK and flushing the corresponding HARQ buffer.

3. The method of claim 1, wherein the subframe type of the conflict subframe for the corresponding HARQ feedback reception for PUSCH is set to UL when performing one of setting the corresponding HARQ feedback to ACK and flushing the corresponding HARQ buffer.

4. The method of claim 3, wherein the subframe type is changed due to dynamic scheduling.

5. The method of claim 3, wherein the subframe type is changed due to Radio Resource Control (RRC) configuration.

6. The method of claim 1, wherein simultaneous transmission and reception is not supported.

7. The method of claim 1, wherein the corresponding HARQ reception is received on a first cell when performing one of setting the corresponding HARQ feedback to ACK and flushing the corresponding HARQ buffer.

8. The method of claim 7, wherein in the subframe for the HARQ feedback reception, there is UL subframe on a second cell when performing one of setting the corresponding HARQ feedback to ACK and flushing the corresponding HARQ buffer.

9. The method of claim 1, wherein the new subframe for HARQ feedback is determined according to the UL-DL configuration of the second cell when performing changing the corresponding HARQ feedback subframe for the PUSCH to another subframe.

10. The method of claim 1, wherein the new subframe for HARQ feedback is determined according to the cell with the UL-DL configuration of the most number of UL subframes when performing changing the corresponding HARQ feedback subframe for the PUSCH to another subframe.

11. A communication device for use in a wireless communication system, the communication device comprising:

a control circuit;

a processor installed in the control circuit to control the control circuit;

a memory installed in the control circuit and coupled to the processor;

wherein the processor is configured to execute a program code stored in the memory to;

aggregate multiple cells with different Time Division Duplex (TDD) uplink (UL)-downlink (DL) configurations;

transmit a Physical Uplink Share Channel (PUSCH) transmission on a first the subframe for Hybrid Automatic Repeat and reQuest (HARQ) feedback reception for the PUSCH in first cell colliding with a UL subframe in a second cell; and

perform one of;

set the corresponding HARQ feedback to Acknowledge (ACK);

flush the corresponding HARQ buffer; and

change the corresponding HARQ feedback subframe for the PUSCH to another subframe.

12. The communication device of claim 11, wherein the processor is further configured to execute the program code to perform UL transmission on the second cell when performing one of setting the corresponding HARQ feedback to ACK and flushing the corresponding HARQ buffer.

13. The communication device of claim 11, wherein the subframe type of the conflict subframe for the corresponding HARQ feedback reception for PUSCH is set to UL when performing one of setting the corresponding HARQ feedback to ACK and flushing the corresponding HARQ buffer.

14. The communication device of claim 13, wherein the subframe type is changed due to dynamic scheduling.

15. The communication device of claim 13, wherein the subframe type is changed due to RRC configuration.

16. The communication device of claim 11, wherein simultaneous transmission and reception is not supported.

17. The communication device of claim 11, wherein the corresponding HARQ reception is received, on a first cell when performing one of setting the corresponding HARQ feedback to ACK and flushing the corresponding HARQ buffer.

18. The communication device of claim 17, wherein in the subframe for the HARQ feedback reception, there is UL subframe on a second cell when performing one of setting the corresponding HARQ feedback to ACK and flushing the corresponding HARQ buffer.

19. The communication device of claim 11, wherein the new subframe for HARQ feedback is determined according to the UL-DL configuration of the second cell when performing changing the corresponding HARQ feedback subframe for the PUSCH to another subframe.

20. The communication device of claim 11, wherein the new subframe for HARQ feedback is determined according to the cell with the UL-DL configuration of the most number of UL subframes when performing changing the corresponding HARQ feedback subframe for the PUSCH to another subframe.