# US 12,009,923 B2 · Method and apparatus for performing downlink reception based on DRX retransmission timer in wireless communication system

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- Number: US 12,009,923 B2
- Document ID: US12009923B2
- Status: Granted
- Kind: B2
- Application number: 17/310,774
- Filed: 2020-03-23
- Published: 2022-03-10
- Granted: 2024-06-11
- Earliest claimed: 2019-03-28
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jeonggu Lee; Sunyoung Lee; Seungjune Yi
- Web page: https://patentgrep.com/patent/US12009923B2

## CPC

- H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes
- H04L 1/1848: {Time-out mechanisms}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- 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 method of performing a downlink (DL) reception by a user equipment (UE) in a wireless communication system. In particular, the method includes the steps of: configuring not to transmit a Hybrid Automatic Repeat Request (HARQ) feedback for a DL HARQ process; upon a first Physical Downlink Control Channel (PDCCH) for the DL HARQ process is detected, starting a timer for monitoring subsequent PDC CHs related to retransmission of the DL HARQ process, without transmitting the HARQ feedback; and monitoring the subsequent PDCCHs related to retransmission of the DL HARQ process while the timer is running.

## Claims

### Claim 1

A method of performing a downlink (DL) reception by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a network, resource allocation information; performing a DL reception based on the resource allocation information;
demapping one or more received layers to a block of complexed-valued modulation symbols;
descrambling and demodulating the block of complexed-valued modulation symbols to obtain a codeword;
decoding the codeword to obtain a data block based on a coding scheme; and
processing the data block,
wherein processing the data block comprises:
configuring not to transmit a Hybrid Automatic Repeat Request (HARQ) feedback for a DL HARQ process;
upon a first Physical Downlink Control Channel (PDCCH) for the DL HARQ process is detected, starting a timer for monitoring subsequent PDCCHs related to retransmission of the DL HARQ process, without transmitting the HARQ feedback;
monitoring the subsequent PDCCHs related to retransmission of the DL HARQ process while the timer is running;
restarting the timer for the DL HARQ process without transmitting the HARQ feedback, based on decoding of DL data related to the first PDCCH failing and a second PDCCH for the DL HARQ process being detected; and
based on decoding of DL data related to the second PDCCH succeeding, stopping the timer for the DL HARQ process, and skipping monitoring of the subsequent PDCCHs for the DL HARQ process.

### Claim 2 (depends on 1)

The method for claim 1, wherein the timer indicates a maximum duration until the retransmission of the DL HARQ process can be expected.

### Claim 3 (depends on 1)

The method for claim 1, wherein the timer for monitoring subsequent PDCCHs related to the retransmission of the DL HARQ process is started regardless of whether the decoding of DL data related to the first PDCCH successes or not.

### Claim 4

A user equipment (UE) in a wireless communication system, the UE comprising:
at least one transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
receiving, from a network, resource allocation information;
performing a downlink (DL) reception based on the resource allocation information;
demapping one or more received layers to a block of complexed-valued modulation symbols;
descrambling and demodulating the block of complexed-valued modulation symbols to obtain a codeword;
decoding the codeword to obtain a data block based on a coding scheme; and
processing the data block,
wherein processing the data block comprises:
configuring not to transmit a Hybrid Automatic Repeat Request (HARQ) feedback for a DL HARQ process;
upon a first Physical Downlink Control Channel (PDCCH) for the DL HARQ process is detected, starting a timer for monitoring subsequent PDCCHs related to retransmission of the DL HARQ process, without transmitting the HARQ feedback;
monitoring the subsequent PDCCHs related to retransmission of the DL HARQ process while the timer is running;
restarting the timer for the DL HARQ process without transmitting the HARQ feedback, based on decoding of DL data related to the first PDCCH failing and a second PDCCH for the DL HARQ process being detected; and
based on decoding of DL data related to the second PDCCH succeeding, stopping the timer for the DL HARQ process, and skipping monitoring of the subsequent PDCCHs for the DL HARQ process.

### Claim 5 (depends on 4)

The UE of claim 4, wherein the timer indicates a maximum duration until the retransmission of the DL HARQ process can be expected.

### Claim 6 (depends on 4)

The UE of claim 4, wherein the timer for monitoring subsequent
PDCCHs related to the retransmission of the DL HARQ process is started regardless of whether the decoding of DL data related to the first PDCCH successes or not.

### Claim 7

An apparatus for a user equipment (UE), the apparatus comprising: at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
receiving, from a network, resource allocation information;
performing a downlink (DL) reception based on the resource allocation information;
demapping one or more received layers to a block of complexed-valued modulation symbols;
descrambling and demodulating the block of complexed-valued modulation symbols to obtain a codeword;
decoding the codeword to obtain a data block based on a coding scheme; and
processing the data block,
wherein processing the data block comprises:
configuring not to transmit a Hybrid Automatic Repeat Request (HARQ) feedback for a DL HARQ process;
upon a first Physical Downlink Control Channel (PDCCH) for the DL HARQ process is detected, starting a timer for monitoring subsequent PDCCHs related to retransmission of the DL HARQ process, without transmitting the HARQ feedback;
monitoring the subsequent PDCCHs related to retransmission of the DL HARQ process while the timer is running;
restarting the timer for the DL HARQ process without transmitting the HARQ feedback, based on decoding of DL data related to the first PDCCH failing and a second PDCCH for the DL HARQ process being detected; and
based on decoding of DL data related to the second PDCCH succeeding, stopping the timer for the DL HARQ process, and skipping monitoring of the subsequent PDCCHs for the DL HARQ process.

### Claim 8

A computer readable storage medium storing at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations for a user equipment (UE), the operations comprising:
receiving, from a network, resource allocation information;
performing a downlink (DL) reception based on the resource allocation information;
demapping one or more received layers to a block of complexed-valued modulation symbols;
descrambling and demodulating the block of complexed-valued modulation symbols to obtain a codeword;
decoding the codeword to obtain a data block based on a coding scheme; and
processing the data block,
wherein processing the data block comprises:
configuring not to transmit a Hybrid Automatic Repeat Request (HARQ) feedback for a DL HARQ process;
upon a first Physical Downlink Control Channel (PDCCH) for the DL HARQ process is detected, starting a timer for monitoring subsequent PDCCHs related to retransmission of the DL HARQ process, without transmitting the HARQ feedback;
monitoring the subsequent PDCCHs related to retransmission of the DL HARQ process while the timer is running;
restarting the timer for the DL HARQ process without transmitting the HARQ feedback, based on decoding of DL data related to the first PDCCH failing and a second PDCCH for the DL HARQ process being detected; and
based on decoding of DL data related to the second PDCCH succeeding, stopping the timer for the DL HARQ process, and skipping monitoring of the subsequent PDCCHs for the DL HARQ process.