# US 11,451,351 B2 · Method for transmitting and receiving downlink data channel and device therefor

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- Number: US 11,451,351 B2
- Document ID: US11451351B2
- Status: Granted
- Kind: B2
- Application number: 16/646,419
- Filed: 2019-02-14
- Published: 2020-12-03
- Granted: 2022-09-20
- Earliest claimed: 2018-02-14
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Kyuhwan Kwak; Hyunho Lee; Seungmin Lee; Yunjung Yi; Daesung Hwang
- Web page: https://patentgrep.com/patent/US11451351B2

## CPC

- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 1/0013: {Rate matching, e.g. puncturing or repetition of code symbols}
- H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)}
- H04L 1/1858: {Transmission or retransmission of more than one copy of acknowledgement message}
- H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)}
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0042: {Intra-user or intra-terminal allocation}
- H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 27/26: Systems using multi-frequency codes (H04L27/32 takes precedence)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Disclosed is a method by which a terminal receives a physical downlink shared channel (PDSCH) in a wireless communication system. Particularly, the method comprises: receiving a physical downlink control channel (PDCCH) for scheduling the PDSCH; acquiring, from the PDCCH, rate matching information for the PDSCH; and receiving the PDSCH at a plurality of transmission time intervals (TTIs) on the basis of the rate matching information, wherein the rate matching information is identically used for the plurality of TTIs.

## Claims

### Claim 1

A method of receiving a physical downlink shared channel (PDSCH) by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, in a first short transmission time interval (sTTI), a physical downlink control channel (PDCCH) that comprises (i) information for scheduling k repetitions of the PDSCH and (ii) rate matching information for the PDSCH;
receiving the PDSCH repeatedly in the first sTTI and (k−1) second sTTI subsequent to the first sTTI, based on the rate matching information; and
transmitting, in a third sTTI, a Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) for the repeatedly received PDSCH,
wherein the rate matching information is identically used for each of the first sTTI and the (k−1) second sTTI, and
wherein the third sTTI for transmitting the HARQ-ACK is determined based on a last of the (k−1) second sTTI in which the PDSCH was repeatedly received.

### Claim 2 (depends on 1)

The method of claim 1, wherein the PDSCH repeatedly received in the first sTTI and the (k−1) second sTTI is for a same transport block (TB).

### Claim 3

A communication device configured to receive a physical downlink shared channel (PDSCH) in a wireless communication system, the communication device comprising:
at least one processor; and
at least one computer-readable storage medium storing instructions that, based on being executed by the at least one processor, control the communication device to:
receive, in a first short transmission time interval (sTTI), a physical downlink control channel (PDCCH) that comprises (i) information for scheduling k repetitions of the PDSCH and (ii) rate matching information for the PDSCH;
receive the PDSCH repeatedly in the first sTTI and (k−1) second sTTI subsequent to the first sTTI, based on the rate matching information; and
transmit, in a third sTTI, a Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) for the repeatedly received PDSCH,
wherein the rate matching information is identically used for each of the first sTTI and the (k−1) second sTTI, and
wherein the third sTTI for transmitting the HARQ-ACK is determined based on a last of the (k−1) second sTTI in which the PDSCH was repeatedly received.

### Claim 4 (depends on 3)

The communication device of claim 3, wherein the PDSCH repeatedly received in the first sTTI and the (k−1) second sTTI is for a same transport block (TB).

### Claim 5

A method of transmitting a physical downlink shared channel (PDSCH) by a base station (BS) in a wireless communication system, the method comprising:
transmitting, in a first short transmission time interval (sTTI), a physical downlink control channel (PDCCH) that comprises (i) information for scheduling k repetitions of the PDSCH and (ii) rate matching information for the PDSCH;
transmitting the PDSCH repeatedly in the first sTTI and (k−1) second sTTI subsequent to the first sTTI, based on the rate matching information; and
receiving, in a third sTTI, a Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) for the repeatedly transmitted PDSCH,
wherein the rate matching information is identically used for each of the first sTTI and the (k−1) second sTTI, and
wherein the third sTTI for receiving the HARQ-ACK is based on a last of the (k−1) second sTTI in which the PDSCH was repeatedly transmitted.

### Claim 6 (depends on 1)

The method of claim 1, wherein the rate matching information is identically used for each of the first sTTI and the (k−1) second sTTI such that:
a rate matching applied to any of the (k−1) second sTTI is identical to a rate matching applied to the first sTTI.

### Claim 7 (depends on 1)

The method of claim 1, wherein the PDCCH includes a value of a Redundancy Version (RV) for the first sTTI, and
wherein the value of the RV is related to a location of the first sTTI.