METHOD AND TERMINAL FOR PERFORMING HARQ

• US 20150195062A1
• Filed: 06/26/2013
• Published: 07/09/2015
• Est. Priority Date: 07/27/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Hwang, Daesung, Seo, Dongyoun, Yi, Yunjung
• Granted Patent: US 9,559,812 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/1469 using time-sharing

Abstract

One disclosure of the present invention provides a method for performing a HARQ in a carrier aggregation. The method can comprise a step of receiving setting information with respect to a plurality of cell groups for setting a HARQ ACK/NACK, wherein each of the plurality of cell groups can comprise one or a plurality of serving cells. The method may comprise the steps of: allocating a number of bits of the HARQ ACK/NACK to cell group units, in accordance with the setting information; and transmitting the HARQ ACK/NACK to a relevant cell group in accordance with the number of bits of the HARQ ACK/NACK that are allocated.

Claims

1. A method for performing HARQ in carrier aggregation, the method comprising:

receiving configuration information for a plurality of cell groups for configuring a HARQ ACK/NACK, each of the plurality of cell groups including one or a plurality of serving cells;

allocating the number of bits of the HARQ ACK/NACK by a cell group unit according to the configuration information; and

transmitting the HARQ ACK/NACK for the corresponding cell group according to the number of bits of the allocated HARQ ACK/NACK.

2. The method of claim 1, wherein in the transmitting, the HARQ-ACK/NACK is transmitted by using the PUCCH format suitable for the number of bits.

3. The method of claim 1, wherein the configuration information is received through an RRC signal.

4. The method of claim 1, wherein the serving cells included in the group do not simultaneously schedule resources for the uplink data.

5. The method of claim 1, wherein the cells included in the group have the same transmission mode.

6. The method of claim 1, wherein in the allocating, N bits per downlink subframe for the HARQ-ACK/NACK are considered with respect to each group.

7. The method of claim 1, wherein in the allocating, the number of bits is allocated by considering the largest number among numbers of transport blocks of cells included in each group.

8. The method of claim 1, wherein in the allocating, the number of bits is allocated by considering the activated cell among the cells included in each group.

9. The method of claim 1, wherein in the allocating, in the case of TDD, the number of bits is allocated by considering a cell having the most number of downlink subframes.

10. The method of claim 1, wherein the HARQ ACK/NACK is transmitted on one uplink channel for each cell group.

11. The method of claim 1, wherein the HARQ ACK/NACK is transmitted onto one uplink channel for each cell group.

12. The method of claim 1, wherein one cell group of the plurality of cell groups includes a primary cell and other cell groups include secondary cells.

13. An user equipment (UE) for performing HARQ in carrier aggregation, the UE comprising:

an RF unit configured to receive configuration information for a plurality of cell groups for configuring a HARQ ACK/NACK, each of the plurality of cell groups including one or a plurality of serving cells; and

a processor configured to allocate the number of bits of the HARQ ACK/NACK by a cell group unit according to the configuration information and transmit the HARQ ACK/NACK for the corresponding cell group according to the number of bits of the allocated HARQ ACK/NACK.