Method for transmitting HARQ-ACK signal in wireless communication system, and apparatus therefor

Patent metadata

Field	Value
Publication number	US-10958384-B2
Application number	US-201816477301-A
Country	US
Kind code	B2
Filing date	Jan 10, 2018
Priority date	Jan 15, 2017
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

The present invention discloses a method for a terminal receiving re-transmitted data in a wireless communication system. In particular, the method may comprise the steps of: receiving from a base station a plurality of transport blocks that include a plurality of code block groups; the respective code block groups mapping and transmitting first HARQ-ACK signals with respect to the respective plurality of code block groups on the basis of an order in which the respective plurality of transport blocks are received, and an order that is included in the respective plurality of transmission blocks; and receiving one or more code block groups that are re-transmitted based on the transmitted first HARQ-ACK signals.

First claim

The invention claimed is:

1. A method for receiving retransmitted data by a user equipment (UE) in a wireless communication system, the method comprising:
receiving a plurality of transport blocks including a plurality of code block groups from a base station (BS);
mapping a plurality of code block groups to first hybrid automatic request (HARQ)-acknowledgement (ACK) signals, based on an order of reception of each of the plural transport blocks and an order of the code block groups included in each of the plural transport blocks, and transmitting the first HARQ-ACK signals; and
receiving one or more code block groups retransmitted based on the transmitted first HARQ-ACK signals,
wherein even-numbered or odd-numbered code block groups in each of the plural transport blocks are mapped to the first HARQ-ACK signals first and then the remaining code block groups are additionally mapped to the first HARQ-ACK signals.

2. The method of claim 1 , wherein code block groups starting from a code block group having a lowest index in each of the transport blocks, among the code block groups included in each of the plural transport blocks, are mapped to the first HARQ-ACK signals in ascending order.

3. The method of claim 1 , wherein only at least one code block group corresponding to a negative-acknowledgement (NACK) signal among the plural code block groups is mapped to the first HARQ-ACK signals.

4. The method of claim 1 , wherein a second HARQ-ACK signal for each of the plural transport blocks is transmitted together with the first HARQ-ACK signal, and the first HARQ-ACK signal and the second HARQ-ACK signal are transmitted over different channels.

5. The method of claim 4 , wherein, based on the number of the code blocks included in the plural transport blocks being smaller than a threshold, only the second HARQ-ACK signal is transmitted.

6. The method of claim 1 , wherein the first HARQ-ACK signals are transmitted by being piggybacked on an uplink data channel.

7. The method of claim 1 , wherein the first HARQ-ACK signal includes a cyclic redundancy check (CRC) bit for checking whether the first HARQ-ACK signal is received, and wherein downlink control information (DCI) including information, informing the UE as to whether the first HARQ-ACK signal is received by the BS, based on the CRC bit, is received from the BS.

8. A user equipment (UE) for receiving retransmitted data in a wireless communication system, the UE comprising:
a radio transmitter and a receiver configured to transmit and receive a radio signal to and from a base station (BS); and
a processor connected to the transmitter and receiver, and configured to:
receive a plurality of transport blocks including a plurality of code block groups from the BS,
map a plurality of code block groups to first hybrid automatic request (HARQ)-acknowledgement (ACK) signals, based on an order of reception of each of the plural transport blocks and an order of the code block groups included in each of the plural transport blocks, and transmit the first HARQ-ACK signals, and
receive one or more code block groups retransmitted based on the transmitted first HARQ-ACK signals,
wherein even-numbered or odd-numbered code block groups are mapped to the first HARQ-ACK signals first and then the remaining code block groups are additionally mapped to the first HARQ-ACK signals, with respect to each of the plural transport blocks.

9. The UE of claim 8 , wherein only at least one code block group corresponding to a negative-acknowledgement (NACK) signal among the plural code block groups is mapped to the first HARQ-ACK signal.

10. The UE of claim 8 , wherein a second HARQ-ACK signal for each of the plural transport blocks is transmitted together with the first HARQ-ACK signal, and
the first HARQ-ACK signal and the second HARQ-ACK signal are transmitted over different channels.

11. The UE of claim 10 , wherein, based on the number of the code blocks included in the plural transport blocks being smaller than a threshold, only the second HARQ-ACK signal is transmitted.

12. The UE of claim 8 , wherein the first HARQ-ACK signals are transmitted by being piggybacked on an uplink data channel.

13. The UE of claim 8 , wherein the first HARQ-ACK signal includes a cyclic redundancy check (CRC) bit for checking whether the first HARQ-ACK signal is received, and wherein downlink control information (DCI) including information, informing the UE as to whether the first HARQ-ACK signal is received by the BS, based on the CRC bit, is received from the BS.

Assignees

• Lg Electronics Inc

Inventors

• Hwang Daesung
• Yi Yunjung
• Lee Hyunho

Classifications

• H04W72/23

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

• H04L5/0055

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title

• H04L1/1812

  Hybrid protocols; Hybrid automatic repeat request [HARQ] · CPC title

• H04L1/1664

  the supervisory signal being transmitted together with payload signals; piggybacking · CPC title

• H04L1/08

  by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} · CPC title