METHOD AND DEVICE FOR ACK/NACK TRANSMISSION IN TDD-BASED WIRELESS COMMUNICATION SYSTEM

• US 20130223300A1
• Filed: 12/29/2011
• Published: 08/29/2013
• Est. Priority Date: 01/02/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yang, Suck Chel, Ahn, Joon Kui, Seo, Dong Youn, Kim, Min Gyu
• Granted Patent: US 8,891,416 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04J 3/1694 Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers Passive Optical Networks H04Q11/0062
• CPC Class Codes: H04L 1/1621 Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 27/2602 Signal structure
• 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 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Provided are a method and a device for ACK/NACK transmission in a TDD (Time Division Duplex)-based wireless communication system. The terminal receives a SPS downlink transmission block on a physical downlink shared channel (PDSCH) without a physical downlink control channel (PDCCH), and receives a downlink transmission block on the PDSCH that is indicated by the PDCCH having a downlink assignment index (DAI). The terminal transmits a 2-bit ACK/NACK regarding the SPS downlink transmission block and the downlink transmission block on an uplink control channel.

Claims

1. A method of transmitting a ACK/NACK in a wireless communication system based on Time Division Duplex in which M, M>

1, downlink subframes are associated with an uplink subframe, performed by a user equipment, the method comprising;

receiving a semi-persistent scheduling (SPS) downlink transport block on a physical downlink shared channel (PDSCH) without a corresponding physical downlink control channel (PDCCH) in one of the M downlink subframes on a serving cell;

receiving a downlink grant on a detected PDCCH in one of the M downlink subframes on the serving cell, the downlink grant including a downlink assignment and a downlink assignment index (DAI), the DAI indicating an accumulative number of PDCCH with assigned PDSCH transmission;

receiving a downlink transport block on a PDSCH indicated by the downlink assignment on the serving cell;

determining a 2 bit ACK/NACK for the SPS downlink transport block and the downlink transport block and a resource index from a plurality of resource indexes;

modulating the 2 bit ACK/NACK to generate a modulation symbol; and

transmitting the modulation symbol on an uplink control channel configured by the determined resource index.

2. The method of claim 1, wherein a value of the DAI is 1.

3. The method of claim 1, wherein the 2 bit ACK/NACK is modulated with Quadrature Phase Shift Keying (QPSK).

4. The method of claim 1, wherein the plurality of resource indexes include a first resource index and a second resource index.

5. The method of claim 4, wherein the first resource index is a pre-determined value and the second resource index is obtained from a resource used for the detected PDCCH having the DAI.

6. The method of claim 1, wherein the downlink transport block includes a first downlink transport block and a second downlink transport block, and the plurality of resource indexes include a first resource index, a second resource index and a third resource index.

7. The method of claim 6, wherein the first resource index is a pre-determined value, the second resource index is obtained from a resource used for the detected PDCCH having the DAI, and the third resource index is obtained from the second resource index.

8. The method of claim 7, wherein the third resource index is obtained by adding 1 to the second resource index.

9. A wireless device configured for transmitting a ACK/NACK in a wireless communication system based on Time Division Duplex in which M, M>

1, downlink subframes are associated with an uplink subframe, the wireless device comprising;

a radio frequency unit configured to transmit radio signals; and

a processor operatively coupled with the radio frequency unit and configured to;

receive a semi-persistent scheduling (SPS) downlink transport block on a physical downlink shared channel (PDSCH) without a corresponding physical downlink control channel (PDCCH) in one of the M downlink subframes on a serving cell;

receive a downlink grant on a detected PDCCH in one of the M downlink subframes on the serving cell, the downlink grant including a downlink assignment and a downlink assignment index (DAI), the DAI indicating an accumulative number of PDCCH with assigned PDSCH transmission;

receive a downlink transport block on a PDSCH indicated by the downlink assignment on the serving cell;

determine a 2 bit ACK/NACK for the SPS downlink transport block and the downlink transport block and a resource index from a plurality of resource indexes;

modulate the 2 bit ACK/NACK to generate a modulation symbol; and

transmit the modulation symbol on an uplink control channel configured by the determined resource index.

10. The wireless device of claim 9, wherein a value of the DAI is 1.

11. The wireless device of claim 9, wherein the 2 bit ACK/NACK is modulated with Quadrature Phase Shift Keying (QPSK).

12. The wireless device of claim 9, wherein the plurality of resource indexes include a first resource index and a second resource index.

13. The wireless device of claim 12, wherein the first resource index is a pre-determined value and the second resource index is obtained from a resource used for the detected PDCCH having the DAI.

14. The wireless device of claim 9, wherein the downlink transport block includes a first downlink transport block and a second downlink transport block, and the plurality of resource indexes include a first resource index, a second resource index and a third resource index.

15. The wireless device of claim 14, wherein the first resource index is a pre-determined value, the second resource index is obtained from a resource used for the detected PDCCH having the DAI, and the third resource index is obtained from the second resource index.