# US 2019/0173650 A1 · Method and Apparatus for Controlling Downlink HARQ Timing in TDD Environment

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- Number: US 2019/0173650 A1
- Document ID: US20190173650A1
- Status: Published application
- Kind: A1
- Application number: 16/269,862
- Filed: 2019-02-07
- Published: 2019-06-06
- Earliest claimed: 2013-08-08
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Dong Hyun Park
- Web page: https://patentgrep.com/patent/US20190173650A1

## CPC

- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0028: {Variable division (indication of the divided channel H04L5/0092)}
- H04L 5/1469: {using time-sharing}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04L 1/1887: {Scheduling and prioritising arrangements}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W 88/08: Access point devices
- 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 specification relates to a method and an apparatus for controlling downlink HARQ timing. A method for controlling downlink HARQ timing according to an embodiment of the present invention comprises the steps of: configuring, by a base station, different duplex modes for a PCell and an SCell and transmitting the configuration information to a terminal; transmitting, by the base station, a PDSCH in subframe n-k of the SCell; and receiving, by the base station, HARQ response information from the terminal in subframe n of the PCell by applying a set index associated with downlink HARQ timing corresponding to the configuration information, wherein k has a value of 4-13.

## Claims

### Claim 1

A method of controlling a downlink HARQ (Hybrid Automatic Retransmit reQuest) timing in a CA (carrier aggregation) environment, the method comprising:
configuring, by a base station (BS), a duplex mode of a PCell (primary cell) to be TDD (time division duplex) and a duplex mode of an SCell (secondary cell) to be FDD (frequency division duplex) and transmitting configuration information to a user equipment (UE);
transmitting, by the BS, a PDSCH (Physical Downlink Shared Channel) transmission in a subframe n−k of the SCell; and
receiving, by the BS, HARQ response information associated with the PDSCH transmission in a subframe n of the PCell from the UE, by applying an association set index k of a downlink HARQ timing associated with a UL-DL (uplink-downlink) configuration of the PCell,
wherein the value of k for subframe n for UL-DL configurations of the PCell 0, 1, 2, 3, 4, and 5 is in the table as provided below:
UL-DL
configuration
Subframe n (FDD, SCell)
(TDD, PCell)
0
1
2
3
4
5
6
7
8
9
0
—
—
6, 5
5, 4
4
—
—
6, 5
5, 4
4
1
7, 6
6, 5, 4
—
—
—
7, 6
6,
—
5, 4
2
—
—
8, 7, 6, 5, 4
—
—
—
—
8, 7, 6,
—
—
5, 4
3
—
—
11, 10, 9, 8, 7, 6
6, 5
5, 4
—
—
—
—
—
4
—
—
12, 11, 10, 9, 8, 7
7, 6, 5, 4
—
—
—
—
—
—
5
—
—
13, 12, 11, 10, 9, 8, 7, 6,
—
—
—
—
—
—
—
5, 4

### Claim 2 (depends on 1)

The method of claim 1, wherein cross-carrier scheduling of the PDSCH transmission through the PCell is not enabled.

### Claim 3 (depends on 1)

The method of claim 1, wherein the PDSCH is scheduled by a downlink control information (DCI) in a (e)PDCCH (physical Downlink Control Channel).

### Claim 4 (depends on 1)

The method of claim 1, wherein the DL association set is a preferred DL association set by the SCell based on a given PCell_TDD UL-DL configuration.

### Claim 5 (depends on 1)

The method of claim 1, wherein the configuration is a TDD-FDD CA configuration.

### Claim 6 (depends on 5)

The method of claim 5, wherein the UE is not configured with CIF.

### Claim 7 (depends on 1)

The method of claim 1, wherein the configuration information is transmitted on the PCell.

### Claim 8

A base station (BS) for controlling a downlink HARQ (Hybrid Automatic Retransmit reQuest) timing in CA (carrier aggregation) environment, comprising:
a radio; and
a processing element operably connected to the radio and configured to:
configure a duplex mode of a PCell (primary cell) to be (TDD) time division duplex and a duplex mode of an SCell (secondary cell) to be FDD (frequency division duplex);
transmit configuration information to a user equipment (UE);
transmit a PDSCH (Physical Downlink Shared Channel) transmission in a subframe n−k of the SCell, wherein cross-carrier scheduling of the PDSCH transmission through the PCell is not enabled; and
receive HARQ response information associated with the PDSCH transmission in a subframe n of the PCell from the UE, by applying an association set index k of a downlink HARQ timing associated with a UL-DL (uplink-downlink) configuration of the PCell,
wherein the value of k for subframe n for UL-DL configurations of the PCell 0, 1, 2, 3, 4 and 5 is in the table as provided below:
UL-DL
configuration
Subframe n (FDD, SCell)
(TDD, PCell)
0
1
2
3
4
5
6
7
8
9
0
—
—
6, 5
5, 4
4
—
—
6, 5
5, 4
4
1
7, 6
6, 5, 4
—
—
—
7, 6
6,
—
5, 4
2
—
—
8, 7, 6, 5, 4
—
—
—
—
8, 7, 6,
—
—
5, 4
3
—
—
11, 10, 9, 8, 7, 6
6, 5
5, 4
—
—
—
—
—
4
—
—
12, 11, 10, 9, 8, 7
7, 6, 5, 4
—
—
—
—
—
—
5
—
—
13, 12, 11, 10, 9, 8, 7, 6,
—
—
—
—
—
—
—
5, 4

### Claim 9 (depends on 8)

The BS of claim 8, wherein the PDSCH is scheduled by a downlink control information (DCI) in a (e)PDCCH (physical Downlink Control Channel).

### Claim 10 (depends on 8)

The BS of claim 8, wherein the DL association set is a preferred DL association set by the SCell based on a given PCell_TDD UL-DL configuration.

### Claim 11 (depends on 8)

The BS of claim 8, wherein the configuration is a TDD-FDD CA configuration.

### Claim 12 (depends on 11)

The BS of claim 11, wherein the UE is not configured with CIF.

### Claim 13 (depends on 8)

The BS of claim 8, wherein the configuration information is transmitted on the PCell.

### Claim 14

An apparatus for controlling a downlink HARQ (Hybrid Automatic Retransmit reQuest) timing of a base station (BS) operating in a CA (carrier aggregation) environment, the apparatus comprising:
a processing element configured to cause the BS to:
configure a duplex mode of a PCell (primary cell) to be time division duplex (TDD);
configure a duplex mode of an SCell (secondary cell) to be FDD (frequency division duplex);
transmit configuration information to a user equipment (UE);
transmit a PDSCH (Physical Downlink Shared Channel) transmission in a subframe n−k of the SCell; and
receive HARQ response information associated with the PDSCH transmission in a subframe n of the PCell from the UE, by applying an association set index k of a downlink HARQ timing associated with a UL-DL (uplink-downlink) configuration of the PCell,
wherein the value of k for subframe n for UL-DL configurations of the PCell 0, 1, 2, 3, 4 and 5 is in the table as provided below:
UL-DL
configuration
Subframe n (FDD, SCell)
(TDD, PCell)
0
1
2
3
4
5
6
7
8
9
0
—
—
6, 5
5, 4
4
—
—
6, 5
5, 4
4
1
7, 6
6, 5, 4
—
—
—
7, 6
6,
—
5, 4
2
—
—
8, 7, 6, 5, 4
—
—
—
—
8, 7, 6,
—
—
5, 4
3
—
—
11, 10, 9, 8, 7, 6
6, 5
5, 4
—
—
—
—
—
4
—
—
12, 11, 10, 9, 8, 7
7, 6, 5, 4
—
—
—
—
—
—
5
—
—
13, 12, 11, 10, 9, 8, 7, 6,
—
—
—
—
—
—
—
5, 4

### Claim 15 (depends on 14)

The apparatus of claim 14, wherein the PDSCH is scheduled by a downlink control information (DCI) in a (e)PDCCH (physical Downlink Control Channel).

### Claim 16 (depends on 14)

The apparatus of claim 14, wherein the DL association set is a preferred DL association set by the SCell based on a given PCell_TDD UL-DL configuration.

### Claim 17 (depends on 14)

The apparatus of claim 14, wherein the configuration is a TDD-FDD CA configuration.

### Claim 18 (depends on 17)

The apparatus of claim 17, wherein the UE is not configured with CIF.

### Claim 19 (depends on 14)

The apparatus of claim 14, wherein the configuration information is transmitted on the PCell.

### Claim 20 (depends on 14)

The apparatus of claim 14, wherein cross-carrier scheduling of the PDSCH transmission through the PCell is not enabled