# US 10,484,142 B2 · Method for transmitting HARQ ACK/NACK feedback by using terminal-specific TDD frame in wireless communication system, and device therefor

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- Number: US 10,484,142 B2
- Document ID: US10484142B2
- Status: Granted
- Kind: B2
- Application number: 15/748,426
- Filed: 2016-07-07
- Published: 2018-08-02
- Granted: 2019-11-19
- Earliest claimed: 2015-07-31
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Dongkyu Kim; Kwangseok Noh; Hyunsoo Ko; Kukheon Choi; Sangrim Lee
- Web page: https://patentgrep.com/patent/US10484142B2

## CPC

- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04L 25/0202: {Channel estimation}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method for a terminal transmitting a hybrid automatic repeat request (HARQ) ACK/NACK feedback by using a terminal-specific TDD frame in a wireless communication system may comprise the steps of: receiving a downlink control channel from a corresponding subframe of the terminal-specific TDD frame; and transmitting a HARQ ACK/NACK for the downlink control channel from an uplink subframe that is the most adjacent to the corresponding subframe among subframes coming after at least four subframes from the corresponding subframe.

## Claims

### Claim 1

A method for transmitting a hybrid automatic repeat request (HARQ) acknowledge (ACK)/non-acknowledge (NACK) using a time division duplex (TDD) scheme by a user equipment (UE) in a wireless communication system, the method comprising:
receiving a downlink (DL) channel in a DL subframe n−k of a first UE-specific TDD frame, wherein a beginning subframe of the first UE-specific TDD frame is configured for downlink, and a next beginning subframe of the first UE-specific TDD frame is configured as a TDD special subframe, and each of remaining subframes of the first UE-specific TDD frame is configured for downlink, wherein the DL subframe n−k is one of subframes of the first UE-specific TDD frame; and
transmitting the HARQ ACK/NACK for the DL channel in a uplink (UL) subframe n of a second UE-specific TDD frame, wherein the UL subframe n of the second UE-specific TDD frame is located after at least four subframes from the DL subframe n−k and the DL subframe n−k is located before k subframes than the UL frame n, wherein a beginning subframe of the second UE-specific TDD frame is configured as a TDD special subframe, and a next beginning subframe of the second UE-specific TDD frame is configured for uplink, and remaining subframes of the second UE-specific TDD frame include at least one UL subframe and/or at least one DL subframe, wherein the UL subframe n is one of among the next beginning subframe of the second UE-specific TDD frame and the at least one UL subframe,
wherein the first UE-specific TDD frame and the second UE-specific TDD frame are successive, and
wherein a relation between the DL subframe n−k and the UL subframe n satisfies one of following tables which define k:
UL/DL
Subframe n
configuration
0
1
2
3
4
5
6
7
8
9
0
23,22,21,19,18,17,16,15,
14,13,12,11,10,9,8,7,6,5,4
UL/DL
Subframe n
configuration
0
1
2
3
4
5
6
7
8
9
1
22,21,18,17,16,
12,11,10,9,
15,14,13,12
8,7,6,5,4
UL/DL
Subframe n
configuration
0
1
2
3
4
5
6
7
8
9
2
21,18,17,16,
13,12,11,
8,7,6,
15,14,13
10,9,8
5,4
and
UL/DL
Subframe n
configuration
0
1
2
3
4
5
6
7
8
9
3
16,15,
13,12,
10,9,
7,6,
14,13
11,10,
8,7
5,4

### Claim 2 (depends on 1)

The method according to claim 1, wherein the beginning subframe of the first UE-specific TDD frame and the next beginning subframe of the first UE-specific TDD frame are configured as first UE-common subframes.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the first UE-common subframes correspond to subframes that are commonly configured, based on configurations for the first UE-specific TDD frame, in UEs of the wireless communication system or UEs of a cell including the UEs.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the beginning subframe of the second UE-specific TDD frame and the next beginning subframe of the second UE-specific TDD frame are configured as second UE-common subframes.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the second UE-common subframes correspond to subframes that are commonly configured, based on configurations for the second UE-specific TDD frame, in UEs of the wireless communication system or UEs of a cell including the UEs.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the UL subframe n is determined as one of among the next beginning subframe of the second UE-specific TDD frame and the at least one UL subframe, based on bundling window sizes corresponding respectively to the next beginning subframe of the second UE-specific TDD frame and the at least one UL subframe, and
wherein bundling window sizes are distributed uniformly in the next beginning subframe of the second UE-specific TDD frame and the at least one UL subframe.

### Claim 7

A user equipment (UE) for transmitting a hybrid automatic repeat request (HARQ) acknowledge (ACK)/non-acknowledge (NACK) using a time division duplex (TDD) scheme in a wireless communication system, the UE comprising:
a transceiver coupled to a processor; and
the processor configured to:
receive a downlink (DL) channel in a DL subframe n−k of a first UE-specific TDD frame, wherein a beginning subframe of the first UE-specific TDD frame is configured for downlink, and a next beginning subframe of the first UE-specific TDD frame is configured as a TDD special subframe, and each of remaining subframes of the first UE-specific TDD frame is configured for downlink, wherein the DL subframe n−k is one of subframes of the first UE-specific TDD frame, and
transmit the HARQ ACK/NACK for the DL channel in a uplink (UL) subframe of a second UE-specific TDD frame wherein the UL subframe n of the second UE-specific TDD frame is located after at least four subframes from the DL subframe n−k and the DL subframe n−k is located before k subframes than the UL frame n, wherein a beginning subframe of the second UE-specific TDD frame is configured as a TDD special subframe, and a next beginning subframe of the second UE-specific TDD frame is configured for uplink, and remaining subframes of the second UE-specific TDD frame include at least one UL subframe and/or at least one DL subframe, wherein the UL subframe n is one of among the next beginning subframe of the second UE-specific TDD frame and the at least one UL subframe,
wherein the first UE-specific TDD frame and the second UE-specific TDD frame are successive, and
wherein a relation between the DL subframe n−k and the UL subframe n satisfies one of following tables which define k:
UL/DL
Subframe n
configuration
0
1
2
3
4
5
6
7
8
9
0
23,22,21,19,18,17,16,15,14,
13,12,11,10,9,8,7,6,5,4
UL/DL
Subframe n
configuration
0
1
2
3
4
5
6
7
8
9
1
22,21,18,17,16,
12,11,10,9,
15,14,13,12
8,7,6,5,4
UL/DL
Subframe n
configuration
0
1
2
3
4
5
6
7
8
9
0
21,18,17,16,
13,12,11,
8,7,6,
15,14,13
10,9,8
5,4
and
UL/DL
Subframe n
configuration
0
1
2
3
4
5
6
7
8
9
3
16,15,14,13
13,12,11,10
10,9,8,7
7,6,5,4

### Claim 8 (depends on 7)

The UE according to claim 7, wherein the beginning subframe of the first UE-specific TDD frame and the next beginning subframe of the first UE-specific TDD frame are configured as a first UE-common subframes.

### Claim 9 (depends on 8)

The UE according to claim 8, wherein the first UE-common subframes correspond to subframes that are commonly configured, based on configurations for the first UE-specific TDD frame, in UEs of the wireless communication system or UEs of a cell including the UEs.

### Claim 10 (depends on 7)

The UE according to claim 7, wherein the beginning subframe of the second UE-specific TDD frame and the next beginning subframe of the second UE-specific TDD frame are configured as second UE-common subframes.

### Claim 11 (depends on 10)

The UE according to claim 10, wherein the second UE-common subframes correspond to subframes that are commonly configured, based on configurations for the second UE-specific TDD frame, in UEs of the wireless communication system or UEs of a cell including the UEs.

### Claim 12 (depends on 7)

The UE according to claim 7,
wherein the UL subframe n is determined as one of among the next beginning subframe of the second UE-specific TDD frame and the at least one UL subframe, based on bundling window sizes corresponding respectively to the next beginning subframe of the second UE-specific TDD frame and the at least one UL subframe, and
wherein bundling window sizes are distributed uniformly in the next beginning subframe of the second UE-specific TDD frame and the at least one UL subframe.