METHOD AND DEVICE FOR TRANSMITTING RECEPTION CONFIRMATION IN WIRELESS COMMUNICATION SYSTEM

• US 20130322343A1
• Filed: 02/10/2012
• Published: 12/05/2013
• Est. Priority Date: 02/10/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Dong Youn, Ahn, Joon Kui, Yang, Suck Chel, Kim, Min Gyu
• Granted Patent: US 9,363,687 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• 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 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 2001/125 Arrangements for preventing errors in the return channel
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

According to one embodiment, a method for transmitting acknowledgement/not-acknowledgement (ACK/NACK) of a user equipment in a wireless communication system. Includes: receiving uplink-downlink (UL-DL) configuration 5 information on a plurality of subframes; receiving data in at least one subframe among the plurality of subframes; configuring ACK/NACK for the received data; and transmitting the ACK/NACK through a UL subframe.

Claims

1. A method for transmitting acknowledgement/not-acknowledgement (ACK/NACK) of a user equipment in a wireless communication system, the method comprising:

receiving uplink-downlink (UL-DL) configuration information on a plurality of subframes;

receiving data in at least one subframe among the plurality of subframes;

configuring ACK/NACK for the received data; and

transmitting the ACK/NACK through a UL subframe,

wherein the plurality of subframes correspond to the UL subframe,

wherein each of the plurality of subframes is any one of a flexible subframe and a default DL subframe fixed to a DL subframe, and the flexible subframe is a subframe that can be configured as a UL subframe or a DL subframe by the UL-DL configuration information, and

wherein an ACK/NACK payload size indicating an information bit size of the ACK/NACK is determined on the basis of the number of default DL subframes, the number of flexible subframes, and a transmission mode of the plurality of subframes.

2. The method of claim 1, wherein the ACK/NACK payload size is the number of bits, which is equal to a product of the maximum number of codewords that can be transmitted in each subframe and a sum of the number of default DL subframes and the total number of flexible subframes included in the plurality of subframes.

3. The method of claim 1, wherein the ACK/NACK payload size is the number of bits, which is equal to a product of the maximum number of codewords that can be transmitted in each subframe and a sum of the number of default DL subframes and the number of default DL subframes recognized by the user equipment as a DL subframe among flexible subframes included in the plurality of subframes.

4. The method of claim 1, wherein the ACK/NACK payload size is the number of bits, which is equal to a sum of a product of the total number of flexible subframes included in the plurality of subframes and the maximum number of codewords that can be transmitted in the flexible subframe and a product of the number of default DL subframes included in the plurality of subframes and the total number of codewords that can be transmitted in the default DL subframe.

5. The method of claim 1, wherein the plurality of subframes and the UL subframe are subframes of a primary cell which performs an initial connection establishment procedure or a connection re-establishment procedure with respect to a base station.

6. The method of claim 1, wherein the plurality of subframes are subframes of a secondary cell additionally allocated to the user equipment in addition to a primary cell, and the UL subframe is a subframe of the primary cell.

7. The method of claim 1, wherein among the plurality of subframes, at least one subframe is a subframe of a primary cell, and the remaining subframes are subframes of a secondary cell.

8. The method of claim 1, wherein the UL-DL configuration information on the plurality of subframes is received through a primary cell.

9. The method of claim 1, wherein if semi-persistently scheduled data is received only in one default DL subframe among the plurality of subframes, the ACK/NACK is transmitted using a physical uplink control channel (PUCCH) format 1a or 1b.

10. The method of claim 1, wherein if scheduled data is received through a physical downlink control channel (PDCCH) only in one default DL subframe among the plurality of subframes and a downlink assignment index (DAI) included in the PDCCH is 1, the ACK/NACK is transmitted using a PUCCH format 1a or 1b.

11. The method of claim 1, wherein if only a PDCCH requesting an ACK/NACK response is received only in one default DL subframe among the plurality of subframes and a DAI included in the PDCCH is 1, the ACK/NACK is transmitted using a PUCCH format 1a or 1b.

12. The method of claim 10 or 11, wherein if data semi-persistently scheduled without a corresponding PDCCH is further received in one default DL subframe among the plurality of subframes, the ACK/NACK is transmitted using channel selection which uses a PUCCH format 1a or 1b.

13. The method of claim 1, wherein the primary cell uses a frequency division duplex (FDD) frame in which DL transmission and UL transmission are performed in different frequency bands.

14. The method of claim 13, wherein the secondary cells use a TDD frame in which DL transmission and UL transmission are performed in the same frequency band at different times.

15. The method of claim 1, wherein the UL-DL configuration information is transmitted through a PDCCH for scheduling first subframes.

16. The method of claim 1, wherein first subframes and a second subframe are separated by 4 subframes.

17. A user equipment comprising:

a radio frequency (RF) unit for transmitting and receiving a radio signal; and

a processor coupled to the RF unit,

wherein the processor receives UL-DL configuration information on a plurality of subframes, receives data in at least one subframe among the plurality of subframes, configures ACK/NACK for the received data, and transmits transmitting the ACK/NACK through a UL subframe,

wherein the plurality of subframes correspond to the UL subframe,

wherein each of the plurality of subframes is any one of a flexible subframe and a default DL subframe fixed to a DL subframe, and the flexible subframe is a subframe that can be configured as a UL subframe or a DL subframe by the UL-DL configuration information, and

wherein an ACK/NACK payload size indicating an information bit size of the ACK/NACK is determined on the basis of the number of default DL subframes, the number of flexible subframes, and a transmission mode of the plurality of subframes.