# US 2021/0243767 A1 · Terminal apparatus, base station apparatus, and communication method

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- Number: US 2021/0243767 A1
- Document ID: US20210243767A1
- Status: Published application
- Kind: A1
- Application number: 17/270,432
- Filed: 2019-08-22
- Published: 2021-08-05
- Earliest claimed: 2018-08-23
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: SHOICHI SUZUKI; TOMOKI YOSHIMURA; TOSHIZO NOGAMI; WATARU OUCHI; TAEWOO LEE; HUIFA LIN
- Web page: https://patentgrep.com/patent/US20210243767A1

## CPC

- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 72/53: based on regulatory allocation policies
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 27/2602: {Signal structure}
- 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
- H04W 76/11: Allocation or use of connection identifiers
- 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}
- H04W 48/12: using downlink control channel
- 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

Communication can be efficiently performed. In a case that a terminal apparatus is configured to monitor a first PDCCH candidate in a CSS and a second PDCCH candidate in a USS according to a DCI format accompanied with a C-RNTI in one non-interleaved CORESET having a period of one OFDM symbol, an aggregation level of the first PDCCH candidate is 8, an aggregation level of the second PDCCH candidate is 16, a lowest index of a CCE constituting the first PDCCH candidate is the same as a lowest index of a CCE constituting the second PDCCH candidate, a higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured for the CORESET, and a size of the DCI format corresponding to the first PDCCH candidate is the same as a size of the DCI format corresponding to the second PDCCH candidate, it is considered that the DCI format is transmitted only in the first PDCCH candidate.

## Claims

### Claim 1

A terminal apparatus comprising:
a processor; and
a memory coupled to the processor and storing instructions, wherein the processor is configured to execute the instructions to
receive a physical downlink control channel (PDCCH) accompanied with a downlink control information (DCI) format, and
receive a physical downlink shared channel (PDSCH) corresponding to a resource indication value (RIV) set to a “Frequency domain resource assignment” field of the DCI format, wherein
the RIV is based on at least a type of a search space in which the PDCCH is detected, and
in a case that
the terminal apparatus is configured to monitor a first PDCCH candidate in a common search space (CSS) and a second PDCCH candidate in a UE-specific search space (USS) according to the DCI format accompanied with a cell radio network temporary identifier (C-RNTI) in one control resource set (CORESET),
a period of the CORESET is one orthogonal frequency division multiplexing (OFDM) symbol,
the CORESET is a non-interleaved CORESET,
one of the first PDCCH candidate and the second PDCCH candidate is of an aggregation level of 8 and the other of the first PDCCH candidate and the second PDCCH candidate is of an aggregation level of 16,
a lowest index of a control channel element (CCE) constituting the first PDCCH candidate is identical to a lowest index of a CCE constituting the second PDCCH candidate,
a higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured for the CORESET, or
a size of the DCI format corresponding to the first PDCCH candidate is identical to a size of the DCI format corresponding to the second PDCCH candidate, the processor is further configured to execute the instructions to consider that
the PDCCH accompanied with the DCI format is transmitted only in the first PDCCH candidate out of the first PDCCH candidate and the second PDCCH candidate,
the PDCCH accompanied with the DCI format is transmitted only in the second PDCCH candidate out of the first PDCCH candidate and the second PDCCH candidate,
the PDCCH accompanied with the DCI format is transmitted or received in the second PDCCH candidate in a case that the PDCCH accompanied with the DCI format is received in the first PDCCH candidate,
the PDCCH accompanied with the DCI format is transmitted or received in the first PDCCH candidate in a case that the PDCCH accompanied with the DCI format is received in the second PDCCH candidate,
the PDCCH accompanied with the DCI format is transmitted only in the PDCCH candidate having the aggregation level of 8,
the PDCCH accompanied with the DCI format is transmitted only in the PDCCH candidate having the aggregation level of 16,
the PDCCH accompanied with the DCI format is transmitted or received in the PDCCH candidate having the aggregation level of 16 in a case that the PDCCH accompanied with the DCI format is detected in the PDCCH candidate having the aggregation level of 8, or
the PDCCH accompanied with the DCI format is transmitted or received in the PDCCH candidate having the aggregation level of 8 in a case that the PDCCH accompanied with the DCI format is detected in the PDCCH candidate having the aggregation level of 16.

### Claim 2 (depends on 1)

The terminal apparatus according to claim 1, wherein a set of fields of the DCI format corresponding to the first PDCCH candidate is identical to a set of fields of the DCI format corresponding to the second PDCCH candidate.

### Claim 3 (depends on 1)

The terminal apparatus according to claim 1, wherein the DCI format is at least one of a DCI format 0_0 and a DCI format 1_0.

### Claim 4 (depends on 1)

The terminal apparatus according to claim 1, wherein
a scrambling sequence cPDCCH(i) used for scrambling the PDCCH is initialized using cPDCCH_init,
cPDCCH_init is based on at least nRNTI,
nRNTI is the C-RNTI for the PDCCH in the USS in a case that the higher layer parameter PDCCH-DMRS-Scrambling-ID is configured for the CORESET,
nRNTI is 0 in a case that the higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured for the CORESET, and
C-RNTI is not 0.

### Claim 5

A base station apparatus comprising:
a processor; and
a memory coupled to the processor and storing instructions, wherein the processor is configured to execute the instructions to
transmit a physical downlink control channel (PDCCH) accompanied with a downlink control information (DCI) format, and
transmit a physical downlink shared channel (PDSCH) corresponding to a resource indication value (RIV) set to a “Frequency domain resource assignment” field of the DCI format, wherein
the RIV is based on at least a type of a search space in which the PDCCH is detected, and
in a case that
the terminal apparatus is configured to monitor a first PDCCH candidate in a common search space (CSS) and a second PDCCH candidate in a UE-specific search space (USS) according to the DCI format accompanied with a cell radio network temporary identifier (C-RNTI) in one control resource set (CORESET),
a period of the CORESET is one orthogonal frequency division multiplexing (OFDM) symbol,
the CORESET is a non-interleaved CORESET,
one of the first PDCCH candidate and the second PDCCH candidate is of an aggregation level of 8 and the other of the first PDCCH candidate and the second PDCCH candidate is of an aggregation level of 16,
a lowest index of a control channel element (CCE) constituting the first PDCCH candidate is identical to a lowest index of a CCE constituting the second PDCCH candidate,
a higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured for the CORESET, or
a size of the DCI format corresponding to the first PDCCH candidate is identical to a size of the DCI format corresponding to the second PDCCH candidate, the processor is further configured to execute the instructions to
transmit the PDCCH accompanied with the DCI format only in the first PDCCH candidate out of the first PDCCH candidate and the second PDCCH candidate,
transmit the PDCCH accompanied with the DCI format only in the second PDCCH candidate out of the first PDCCH candidate and the second PDCCH candidate,
consider that the PDCCH accompanied with the DCI format is transmitted in the second PDCCH candidate in a case that the PDCCH accompanied with the DCI format is transmitted in the first PDCCH candidate,
consider that the PDCCH accompanied with the DCI format is transmitted in the first PDCCH candidate in a case that the PDCCH accompanied with the DCI format is transmitted in the second PDCCH candidate,
transmit the PDCCH accompanied with the DCI format only in the PDCCH candidate having the aggregation level of 8 out of the first PDCCH candidate and the second PDCCH candidate,
transmit the PDCCH accompanied with the DCI format only in the PDCCH candidate having the aggregation level of 16 out of the first PDCCH candidate and the second PDCCH candidate,
consider that the PDCCH accompanied with the DCI format is transmitted in the PDCCH candidate having the aggregation level of 16 in a case that the PDCCH accompanied with the DCI format is transmitted in the PDCCH candidate having the aggregation level of 8, or
consider that the PDCCH accompanied with the DCI format is transmitted in the PDCCH candidate having the aggregation level of 8 in a case that the PDCCH accompanied with the DCI format is transmitted in the PDCCH candidate having the aggregation level of 16.

### Claim 6 (depends on 5)

The base station apparatus according to claim 5, wherein a set of fields of the DCI format corresponding to the first PDCCH candidate is identical to a set of fields of the DCI format corresponding to the second PDCCH candidate.

### Claim 7 (depends on 5)

The base station apparatus according to claim 5, wherein the DCI format is at least one of a DCI format 0_0 and a DCI format 1_0.

### Claim 8 (depends on 5)

The base station apparatus according to claim 5, wherein
a scrambling sequence cPDCCH(i) used for scrambling of the PDCCH is initialized using CPDCCH_init,
cPDCCH_init is based on at least nRNTI,
nRNTI is the C-RNTI for the PDCCH in the USS in a case that the higher layer parameter PDCCH-DMRS-Scrambling-ID is configured for the CORESET,
nRNTI is 0 in a case that the higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured for the CORESET, and
C-RNTI is not 0.

### Claim 9

A communication method used for a terminal apparatus, the communication method comprising:
receiving a physical downlink control channel (PDCCH) accompanied with a downlink control information (DCI) format; and
receiving a physical downlink shared channel (PDSCH) corresponding to a resource indication value (RIV) set to a “Frequency domain resource assignment” field of the DCI format, wherein:
the RIV is based on at least a type of a search space in which the PDCCH is detected; and
in a case that
the terminal apparatus is configured to monitor a first PDCCH candidate in a common search space (CSS) and a second PDCCH candidate in a UE-specific search space (USS) according to the DCI format accompanied with a cell radio network temporary identifier (C-RNTI) in one control resource set (CORESET),
a period of the CORESET is one orthogonal frequency division multiplexing (OFDM) symbol,
the CORESET is a non-interleaved CORESET,
one of the first PDCCH candidate and the second PDCCH candidate is of an aggregation level of 8 and the other of the first PDDCH candidate and the second PDCCH candidate is of an aggregation level of 16,
that a lowest index of a control channel element (CCE) constituting the first PDCCH candidate is identical to a lowest index of a CCE constituting the second PDCCH candidate,
a higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured for the CORESET, or
a size of the DCI format corresponding to the first PDCCH candidate is identical to a size of the DCI format corresponding to the second PDCCH candidate, considering that
the PDCCH accompanied with the DCI format is transmitted only in the first PDCCH candidate out of the first PDCCH candidate and the second PDCCH candidate,
the PDCCH accompanied with the DCI format is transmitted only in the second PDCCH candidate out of the first PDCCH candidate and the second PDCCH candidate,
the PDCCH accompanied with the DCI format is transmitted or received in the second PDCCH candidate in a case that the PDCCH accompanied with the DCI format is received in the first PDCCH candidate,
the PDCCH accompanied with the DCI format is transmitted or received in the first PDCCH candidate in a case that the PDCCH accompanied with the DCI format is received in the second PDCCH candidate,
the PDCCH accompanied with the DCI format is transmitted only in the PDCCH candidate having the aggregation level of 8,
the PDCCH accompanied with the DCI format is transmitted only in the PDCCH candidate having the aggregation level of 16,
the PDCCH accompanied with the DCI format is transmitted or received in the PDCCH candidate having the aggregation level of 16 in a case that the PDCCH accompanied with the DCI format is detected in the PDCCH candidate having the aggregation level of 8, or
the PDCCH accompanied with the DCI format is transmitted or received in the PDCCH candidate having the aggregation level of 8 in a case that the PDCCH accompanied with the DCI format is detected in the PDCCH candidate having the aggregation level of 16.

### Claim 10

(canceled)

### Claim 11 (depends on 9)

The method according to claim 9, wherein a set of fields of the DCI format corresponding to the first PDCCH candidate is identical to a set of fields of the DCI format corresponding to the second PDCCH candidate.

### Claim 12 (depends on 9)

The method according to claim 9, wherein the DCI format is at least one of a DCI format 0_0 and a DCI format 1_0.

### Claim 13 (depends on 9)

The method according to claim 9, wherein
a scrambling sequence cPDCCH(i) used for scrambling the PDCCH is initialized using CPDCCH_init,
cPDCCH_init is based on at least nRNTI,
nRNTI is the C-RNTI for the PDCCH in the USS in a case that the higher layer parameter PDCCH-DMRS-Scrambling-ID is configured for the CORESET,
nRNTI is 0 in a case that the higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured for the CORESET, and
C-RNTI is not 0.