# US 2025/0096989 A1 · Transmission and reception of physical downlink control channels

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- Number: US 2025/0096989 A1
- Document ID: US20250096989A1
- Status: Published application
- Kind: A1
- Application number: 18/964,908
- Filed: 2024-12-02
- Published: 2025-03-20
- Earliest claimed: 2017-02-03
- Assignees: InterDigital Patent Holdings, Inc.
- Applicants: InterDigital Patent Holdings, Inc.
- Inventors: Mahmoud Taherzadeh Boroujeni; Moon-il Lee; Afshin Haghighat; Shahrokh Nayeb Nazar; Oghenekome Oteri
- Web page: https://patentgrep.com/patent/US20250096989A1

## CPC

- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- 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)

## Abstract

A wireless transmit/receive unit (WTRU) may receive a PDCCH transmission comprising a CCE that is mapped to one or more REGs based on a CCE-to-REG mapping. The WTRU may receive the CCE-to-REG mapping that indicates a REG bundle corresponding to the CCE and use the CCE-to-REG mapping to identify the REGs for the WTRU. Depending on whether the CCE-to-REG mapping is interleaving or noninterleaving, the CCE-to-REG mapping may be based on different parameters. If the CCE-to-REG mapping is interleaving, the CCE-to-REG mapping may be based on an index associated with the CCE and a number of REGs in the REG bundle. If the CCE-to-REG mapping is noninterleaving, the CCE-to-REG mapping may be based on the index of the CCE.

## Claims

### Claim 1

A network node comprising:
a processor configured to:
determine a control resource set (CORESET) comprising a plurality of resource element group (REG) bundles, wherein a REG bundle of the plurality of REG bundles comprises a plurality of REGs;
determine the plurality of REGs to be included in the REG bundle, wherein the plurality of REGs are determined based on a number of REGs in the REG bundle and a number of REGs in the CORESET;
assemble the REG bundle using the determined plurality of REGs;
determine a control channel element (CCE)-to-REG mapping for the control resource set based on the REG bundle, wherein the determination of the CCE-to-REG mapping is based on an index associated with the CCE and the number of REGs in the REG bundle; and
send a physical downlink control channel (PDCCH) transmission associated with the CORESET based on the CCE-to-REG mapping.

### Claim 2 (depends on 1)

The network node of claim 1, wherein the plurality of REGs are ordered in time or frequency.

### Claim 3 (depends on 1)

The network node of claim 1, wherein on a condition that interleaving is used, the determination of the CCE-to-REG mapping is based on a modulo-operation interleaver, wherein a multiplying factor associated with the modulo-operation interleaver is a function of a size of the CORESET, wherein the size of the control resource set comprises a number of REG bundles in the CORESET.

### Claim 4 (depends on 1)

The network node of claim 1, wherein the CCE-to-REG mapping is further based on a number of OFDM symbols in the CORESET.

### Claim 5 (depends on 1)

The network node of claim 1, wherein the processor is further configured by radio resource control signaling to determine whether the CCE-to-REG mapping is interleaved or non-interleaved.

### Claim 6 (depends on 1)

The network node of claim 1, wherein the PDCCH transmission comprises consecutive CCEs.

### Claim 7 (depends on 1)

The network node of claim 1, wherein the CORESET comprises a plurality of orthogonal frequency-division multiplex (OFDM) symbols, wherein a different interleaver is used for a different OFDM symbol of the plurality of OFDM symbols.

### Claim 8

A method implemented by a network node, the method comprising:
determining a control resource set (CORESET) comprising a plurality of resource element group (REG) bundles, wherein a REG bundle of the plurality of REG bundles comprises a plurality of REGs;
determining the plurality of REGs to be included in the REG bundle, wherein the plurality of REGs are determined based on a number of REGs in the REG bundle and a number of REGs in the CORESET;
assembling the REG bundle using the determined plurality of REGs;
determining a control channel element (CCE)-to-REG mapping for the control resource set based on the REG bundle, wherein the determination of the CCE-to-REG mapping is based on an index associated with the CCE and the number of REGs in the REG bundle; and
sending a physical downlink control channel (PDCCH) transmission associated with the CORESET based on the CCE-to-REG mapping.

### Claim 9 (depends on 8)

The method of claim 8, wherein the plurality of REGs are ordered in time or frequency.

### Claim 10 (depends on 8)

The method of claim 8, wherein on a condition that interleaving is used, the determination of the CCE-to-REG mapping is based on a modulo-operation interleaver, wherein a multiplying factor associated with the modulo-operation interleaver is a function of a size of the CORESET, wherein the size of the control resource set comprises a number of REG bundles in the CORESET.

### Claim 11 (depends on 8)

The method of claim 8, wherein the CCE-to-REG mapping is further based on a number of OFDM symbols in the CORESET.

### Claim 12 (depends on 8)

The method of claim 8, further comprising configuring by radio resource control signaling to determine whether the CCE-to-REG mapping is interleaved or non-interleaved.

### Claim 13 (depends on 8)

The method of claim 8, wherein the PDCCH transmission comprises consecutive CCEs.

### Claim 14 (depends on 8)

The method of claim 8, wherein the CORESET comprises a plurality of orthogonal frequency-division multiplex (OFDM) symbols, wherein a different interleaver is used for a different OFDM symbol of the plurality of OFDM symbols.

### Claim 15 (depends on 8)

A non-transitory computer readable medium comprising instructions which, when executed by one or more processors, cause the one or more processors to implement the method of claim 8.