# US 2025/0220680 A1 · Method and device for pdcch repetition in multi-trp system

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- Number: US 2025/0220680 A1
- Document ID: US20250220680A1
- Status: Published application
- Kind: A1
- Application number: 19/086,775
- Filed: 2025-03-21
- Published: 2025-07-03
- Earliest claimed: 2020-10-09
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Hamid SABER; Jung Hyun BAE
- Web page: https://patentgrep.com/patent/US20250220680A1

## CPC

- H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 1/0007: {by modifying the frame length}
- H04L 1/1819: {with retransmission of additional or different redundancy}
- H04L 1/1887: {Scheduling and prioritising arrangements}
- H04L 1/1896: {ARQ related signaling}
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 72/1273: of downlink data flows
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- 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 and a user equipment (UE) are provided for explicitly linking repeated physical downlink control channels (PDCCHs). The UE receives the repeated PDCCHs from a network. Each of the repeated PDCCHs include downlink control information (DCI) that schedules reception of a same physical downlink shared channel (PDSCH) at the UE. The UE links the repeated PDCCHs having common PDCCH candidate numbers across search space (SS) sets of a control resource set (CORESET). The repeated PDCCHs are received in accordance with the UE and the network communicating using a multi-transmission and reception point (TRP) repetition scheme or a multi-TRP multi-chance scheme.

## Claims

### Claim at position 1

1-20. (canceled)

### Claim 21

A method comprising:
determining, at a user equipment (UE), that two or more physical downlink control channel (PDCCH) candidates are linked, wherein the two or more PDCCH candidates have common PDCCH candidate numbers across search space (SS) sets and comprises same downlink control information (DCI) scheduling reception of a same physical downlink shared channel (PDSCH);
sorting the two or more PDCCH candidates in an ascending order of their start times; and
determining a start time of a monitoring occasion for detection of PDCCHs corresponding to the two or more PDCCH candidates.

### Claim 22 (depends on 21)

The method of claim 21, wherein the start time of the monitoring occasion is determined as the start time of an earliest of the two or more PDCCH candidates.

### Claim 23 (depends on 21)

The method of claim 21, wherein determining that the two or more PDCCH candidates are linked comprises detecting that the two or more PDCCH candidates share a same hybrid automatic repeat request (HARQ) process number and new data indicator (NDI) value.

### Claim 24 (depends on 23)

The method of claim 23, wherein the two or more PDCCH candidates are received within a same slot and are mapped to a same uplink control channel (PUCCH) for acknowledgment signaling.

### Claim 25 (depends on 21)

The method of claim 21, wherein each of the two or more PDCCH candidates is associated with a distinct SS set and each SS set is associated with a different transmission configuration indicator (TCI) state of a control resource set (CORESET).

### Claim 26 (depends on 25)

The method of claim 25, wherein the two or more PDCCH candidates are received from different transmission and reception points (TRPs) in accordance with a multi-TRP repetition scheme.

### Claim 27 (depends on 21)

The method of claim 21, wherein sorting the two or more PDCCH candidates in the ascending order of the start times comprises applying a predefined rule to resolve conflicts among candidate start times.

### Claim 28 (depends on 27)

The method of claim 27, wherein the predefined rule comprises a configuration received from a base station indicating a prioritization of a transmission configuration indicator (TCI) state or control resource set (CORESET).

### Claim 29 (depends on 21)

The method of claim 21, further comprising:
selecting one of the two or more PDCCH candidates as a representative for acknowledgment feedback; and
disregarding one or more other PDCCH candidates based on the determined start time of the monitoring occasion.

### Claim 30 (depends on 29)

The method of claim 29, wherein the acknowledgment feedback is generated based on a downlink assignment indicator (DAI) field value included in the selected PDCCH candidate.

### Claim 31

A user equipment (UE) comprising:
a processor; and
a non-transitory computer-readable storage medium storing instructions that, when executed by the processor, cause the processor to:
determine that two or more physical downlink control channel (PDCCH) candidates are linked, wherein the two or more PDCCH candidates have common PDCCH candidate numbers across search space (SS) sets and comprise same downlink control information (DCI) scheduling reception of a same physical downlink shared channel (PDSCH);
sort the two or more PDCCH candidates in ascending order of their start times; and
determine a start time of a monitoring occasion for detection of PDCCHs corresponding to the two or more PDCCH candidates.

### Claim 32 (depends on 31)

The UE of claim 31, wherein the instructions, when executed, further cause the processor to determine the start time of the monitoring occasion as the start time of an earliest of the two or more PDCCH candidates.

### Claim 33 (depends on 31)

The UE of claim 31, wherein the instructions, when executed, further cause the processor to determine that the two or more PDCCH candidates are linked based on detecting that the two or more PDCCH candidates share a same hybrid automatic repeat request (HARQ) process number and new data indicator (NDI) value.

### Claim 34 (depends on 33)

The UE of claim 33, wherein the instructions, when executed, further cause the processor to determine that the two or more PDCCH candidates are received within a same slot and are mapped to a same uplink control channel (PUCCH) for acknowledgment signaling.

### Claim 35 (depends on 31)

The UE of claim 31, wherein the instructions, when executed, further cause the processor to determine that each of the two or more PDCCH candidates is associated with a distinct SS set, and each SS set is associated with a different transmission configuration indicator (TCI) state of a control resource set (CORESET).

### Claim 36 (depends on 35)

The UE of claim 35, wherein the instructions, when executed, further cause the processor to receive the two or more PDCCH candidates from different transmission and reception points (TRPs) in accordance with a multi-TRP repetition scheme.

### Claim 37 (depends on 31)

The UE of claim 31, wherein the instructions, when executed, further cause the processor to sort the two or more PDCCH candidates in the ascending order of the start times by applying a predefined rule to resolve conflicts among candidate start times.

### Claim 38 (depends on 37)

The UE of claim 37, wherein the predefined rule comprises a configuration received from a base station indicating a prioritization of a transmission configuration indicator (TCI) state or a control resource set (CORESET).

### Claim 39 (depends on 31)

The UE of claim 31, wherein the instructions, when executed, further cause the processor to:
select one of the two or more PDCCH candidates as a representative for acknowledgment feedback, and
disregard one or more other PDCCH candidates based on the determined start time of the monitoring occasion.

### Claim 40 (depends on 39)

The UE of claim 39, wherein the acknowledgment feedback is generated based on a downlink assignment indicator (DAI) field value included in the selected PDCCH candidate.