Method and apparatus for designing ACK/NACK channel in wireless communication system

• US 11,251,924 B2
• Filed: 07/25/2018
• Issued: 02/15/2022
• Est. Priority Date: 07/25/2017
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yi, Yunjung
• Primary Examiner(s): Moore, Jr., Michael J
• Application Number:
  US16/631,764
• Publication Number:
  US 20200136784A1
• Time in Patent Office: 1,301 Days
• CPC Class Codes: H04J 13/0062 Zadoff-Chu
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• 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: 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

A method and apparatus for transmitting an acknowledgement/non-acknowledgement (ACK/NACK) in a wireless communication system is provided. According to the present invention, an ACK/NACK channel, like a physical HARQ indicator channel (PHICH) in long-term evolution (LTE), is designed in a new radio access technology (NR) system. Specifically, a base station (BS) receives uplink (UL) data from a UE, maps a resource for an ACK/NACK channel, which is used to transmit the ACK/NACK as a response to the UL data, to at least one control channel element (CCE) or at least one resource element group (REG), and transmits the ACK/NACK to the UE. The ACK/NACK channel is multiplexed with a physical downlink control channel (PDCCH) in the at least one CCE or the at least one REG.

Claims

1. A method for transmitting an acknowledgement/non-acknowledgement (ACK/NACK) by a base station (BS) in a wireless communication system, the method comprising:

receiving uplink (UL) data from a user equipment (UE); and

transmitting, to the UE via an ACK/NACK channel, the ACK/NACK as a response to the UL data,

wherein the ACK/NACK channel is mapped to at least one control channel element (CCE), and

wherein the at least one CCE to which the ACK/NACK channel is mapped is used for physical downlink control channel (PDCCH) candidates in a search space for decoding a PDCCH based on that;

(i) the PDCCH is modulated by a quadrature phase shift keying (QPSK); and

(ii) the ACK/NACK is modulated by the QPSK with a phase shifted by 45 degrees.

2. The method of claim 1, wherein the ACK/NACK channel is at least one resource among multiple resources configured by the BS.

3. The method of claim 2, wherein the multiple resources are differentiated by one of time, frequency or demodulation reference signal (DM-RS) code.

4. The method of claim 1, wherein a mapping relationship between the ACK/NACK channel and the at least one CCE is determined based on a number of ACK/NACK sequences in a same resource.

5. The method of claim 1, wherein one or more ACK/NACK sequences are mapped to the ACK/NACK channel.

6. The method of claim 1, wherein the at least one CCE is configured among a set of CCEs used for an ACK/NACK transmission.

7. The method of claim 6, wherein whether the ACK/NACK transmission has occurred or not is indicated by a group common PDCCH.

8. The method of claim 6, wherein the set of CCEs used for the ACK/NACK transmission is configured by a radio network temporary identity (RNTI).

9. The method of claim 8, wherein a mapping between the set of CCEs for the ACK/NACK transmission and the ACK/NACK channel is indicated by a hashing function in the RNTI.

10. The method of claim 1, wherein the ACK/NACK is transmitted by using a Zadoff-Chu (ZC) based sequence with a cyclic shift (CS).

12. The method of claim 1, wherein the UE is in communication with at least one of a mobile device, a network, or autonomous vehicles other than the UE.

11. A base station (BS) configured to operate in a wireless communication system, the BS comprising:

a memory;

a transceiver; and

at least one processor, operably coupled to the memory and the transceiver, configured to;

control the transceiver to receive uplink (UL) data from a user equipment (UE); and

control the transceiver to transmit, to the UE via an ACK/NACK channel, the ACK/NACK as a response to the UL data,

wherein the ACK/NACK channel is mapped to at least one control channel element (CCE), and

wherein the at least one CCE to which the ACK/NACK channel is mapped is used for physical downlink control channel (PDCCH) candidates in a search space for decoding a PDCCH based on that;

(i) the PDCCH is modulated by a quadrature phase shift keying (QPSK); and

(ii) the ACK/NACK is modulated by the QPSK with a phase shifted by 45 degrees.