# US 11,121,843 B2 · Method and device for transmitting signal in wireless communication system

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- Number: US 11,121,843 B2
- Document ID: US11121843B2
- Status: Granted
- Kind: B2
- Application number: 17/002,684
- Filed: 2020-08-25
- Published: 2020-12-10
- Granted: 2021-09-14
- Earliest claimed: 2015-07-01
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Suckchel Yang; Joonkui Ahn
- Web page: https://patentgrep.com/patent/US11121843B2

## CPC

- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04W 72/12: Wireless traffic scheduling
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 1/1664: {the supervisory signal being transmitted together with payload signals; piggybacking}
- H04L 2001/125: {Arrangements for preventing errors in the return channel}
- 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

The present invention relates to a wireless communication system. Specifically, the present invention relates to a method for transmitting, by a terminal, an HARQ-ACK in a CA wireless communication system and a device therefor, the method comprising the steps of: receiving a first PDCCH including a first DAI and a second DAI within SF #n-k; configuring an HARQACK payload using the first DAI and the second DAI; and transmitting the HARQ-ACK payload in SF on, wherein the value of the first DAI indicates the order values of scheduling of cell/SF units associated with the first PDCCH in SF #n-k, the order values of scheduling of cell/SF units are counted in a manner in which priority is given to cells in the cell/SF domain, and the value of the second DAI corresponds to a value obtained by accumulating the numbers of cells scheduled for the terminal by a DG DCI in each SF from the first SF to the SF, in which the first PDCCH is received, within SF #n-k (k #K).

## Claims

### Claim 1

A method for receiving a hybrid automatic repeat request (HARQ-ACK) payload by a base station in a carrier aggregation (CA) wireless communication system, the method comprising:
transmitting a first physical downlink control channel (PDCCH) for downlink scheduling through one of plural cells in a time interval, the first PDCCH including a first downlink assignment index (DAI) and a second DAI;
transmitting a downlink data based on the first PDCCH; and
receiving the HARQ-ACK payload including HARQ-ACK information for the downlink data generated by a user equipment (UE) based on the first and second DAIS,
wherein the first DAI is related to a counter value of the downlink scheduling, the counter value being counted in a cell prioritized manner in a unit of {cell, time interval} pair, and
wherein the second DAI indicates a total number of downlink scheduling(s) over the plural cells, up to a current time interval within a set of time intervals, the total number being updated from time interval to time interval, and the second DAI has a same value as other second DAIS corresponding to a plurality of first PDCCHs and received in a same time interval.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the first PDCCH is transmitted in a UE-specific search space (USS) within the set of time intervals.

### Claim 3 (depends on 2)

The method of claim 2, further comprising:
transmitting a second PDCCH in a common search space (CSS) within the set of time intervals, wherein the second PDCCH does not contain the second DAI.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the first PDCCH is (i) a PDCCH for scheduling a physical downlink shared channel (PDSCH) or (ii) a PDCCH indicating a semi-persistent scheduling release (SPS release).

### Claim 5 (depends on 4)

The method according to claim 4, wherein the HARQ-ACK payload comprises an HARQ-ACK response to the PDSCH or an HARQ-ACK response to the PDCCH indicating the SPS release.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the set of time intervals consists of SF #n-k, and an uplink (UL) subframe is a subframe #n,
wherein K: {k0, k1, . . . kM-1} is given per cell as follows:
TDD UL-DL
Subframe n
Configuration
0
1
2
3
4
5
6
7
8
9
0
—
—
6
—
4
—
—
6
—
4
1
—
—
7, 6
4
—
—
—
7, 6
4
—
2
—
—
8, 7, 4, 6
—
—
—
—
8, 7, 4, 6
—
—
3
—
—
7, 6, 11
6, 5
5, 4
—
—
—
—
—
4
—
—
12, 8, 7, 11
6, 5, 4, 7
—
—
—
—
—
—
5
—
—
13, 12, 9, 8, 7, 5, 4,
—
—
—
—
—
—
—
11, 6
6
—
—
7
7
5
—
—
7
7
—.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the cell prioritized manner includes: downlink scheduling is counted in order of increasing time interval index after increasing a cell index within the set of time intervals.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the set of time intervals includes a bundling window of downlink (DL) subframes.

### Claim 9

A base station configured to receive a hybrid automatic repeat request (HARQ-ACK) payload in a carrier aggregation (CA) wireless communication system, the base station comprising:
a radio frequency (RF) unit; and
a processor,
wherein the processor is configured to:
transmit a first physical downlink control channel (PDCCH) for downlink scheduling through one of plural cells in a time interval, the first PDCCH including a first downlink assignment index (DAI) and a second DAI;
transmit a downlink data based on the first PDCCH; and
receive the HARQ-ACK payload including HARQ-ACK information for the downlink data generated by a user equipment (UE) based on the first and second DAIs,
wherein the first DAI is related to a counter value of the downlink scheduling, the counter value being counted in a cell prioritized manner in a unit of {cell, time interval} pair, and
wherein the second DAI is related to a total number of downlink scheduling(s) over the plural cells, up to a current time interval within a set of time intervals, the total number being updated from time interval to time interval, and the second DAI has a same value as other second DAIs corresponding to a plurality of first PDCCHs and received in a same time interval.

### Claim 10 (depends on 9)

The base station according to claim 9, wherein the first PDCCH is transmitted in a UE-specific search space (USS) within the set of time intervals.

### Claim 11 (depends on 10)

The base station according to claim 10, wherein the processor is further configured to transmit a second PDCCH in a common search space (CSS) within the set of time intervals, wherein the second PDCCH does not contain the second DAI.

### Claim 12 (depends on 9)

The base station according to claim 9, wherein the first PDCCH is (i) a PDCCH for scheduling a physical downlink shared channel (PDSCH) or (ii) a PDCCH indicating a semi-persistent scheduling release (SPS release).

### Claim 13 (depends on 12)

The base station according to claim 12, wherein the HARQ-ACK payload comprises an HARQ-ACK response to the PDSCH or an HARQ-ACK response to the PDCCH indicating the SPS release.

### Claim 14 (depends on 9)

The base station according to claim 9, wherein the set of time intervals consists of SF #n-k, and an uplink (UL) subframe is a subframe #n,
wherein K: {k0, k1, . . . kM-1} is given per cell as follows:
TDD UL-DL
Subframe n
Configuration
0
1
2
3
4
5
6
7
8
9
0
—
—
6
—
4
—
—
6
—
4
1
—
—
7, 6
4
—
—
—
7, 6
4
—
2
—
—
8, 7, 4, 6
—
—
—
—
8, 7, 4, 6
—
—
3
—
—
7, 6, 11
6, 5
5, 4
—
—
—
—
—
4
—
—
12, 8, 7, 11
6, 5, 4, 7
—
—
—
—
—
—
5
—
—
13, 12, 9, 8, 7, 5, 4,
—
—
—
—
—
—
—
11, 6
6
—
—
7
7
5
—
—
7
7
—.

### Claim 15 (depends on 9)

The base station according to claim 9, wherein the cell prioritized manner includes: downlink scheduling is counted in order of increasing time interval index after increasing a cell index within the set of time intervals.

### Claim 16 (depends on 9)

The base station according to claim 9, wherein the set of time intervals includes a bundling window of downlink (DL) subframes.