# US 2021/0344448 A1 · Base stations and methods

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- Number: US 2021/0344448 A1
- Document ID: US20210344448A1
- Status: Published application
- Kind: A1
- Application number: 17/261,729
- Filed: 2019-07-24
- Published: 2021-11-04
- Earliest claimed: 2018-07-26
- Assignees: Sharp Kabushiki Kaisha; FG Innovation Company Limited
- Applicants: Sharp Kabushiki Kaisha; FG Innovation Company Limited
- Inventors: TOSHIZO NOGAMI; DAIICHIRO NAKASHIMA; SHOICHI SUZUKI; WATARU OUCHI; TOMOKI YOSHIMURA; TAEWOO LEE; HUIFA LIN
- Web page: https://patentgrep.com/patent/US20210344448A1

## CPC

- H04L 1/1614: {using bitmaps}
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/1887: {Scheduling and prioritising arrangements}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04W 72/1273: of downlink data flows
- 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 base station which communicates with a user equipment (UE) is described. The RRC configuration information may indicate that a maximum number of codewords scheduled by DCI is two. The base station may comprise transmitting circuitry configured to, after a channel access procedure, transmit, to the UE, a PDSCH which contains only a first transport block. The base station may further comprise receiving circuitry configured to receive, from the UE, a HARQ-ACK feedback including at least a first HARQ-ACK information bit and a second HARQ-ACK information bit. The first HARQ-ACK information bit may correspond to the first transport block of the PDSCH. The second HARQ-ACK information bit may be set to NACK. A contention window for the channel access procedure may be adjusted using the HARQ-ACK feedback, wherein the second HARQ-ACK information bit may be ignored.

## Claims

### Claim 1

A base station which communicates with a user equipment (UE), the base station comprising:
higher layer processing circuitry configured to send first radio resource control (RRC) configuration information and second RRC configuration information, the first RRC configuration information indicating that Physical Downlink Shared Channel Hybrid Automatic Repeat Request-Acknowledgment (PDSCH HARQ-ACK) codebook is semi static, and the second RRC configuration information indicating that a maximum number of codewords scheduled by Downlink Control Information (DCI) is two;
transmitting circuitry configured to, after a channel access procedure, transmit, to the UE, a PDSCH which contains only a first transport block; and
receiving circuitry configured to receive, from the UE, a HARQ-ACK feedback including at least a first HARQ-ACK information bit and a second HARQ-ACK information bit, the first HARQ-ACK information bit corresponding to the first transport block of the PDSCH;
wherein
the second HARQ-ACK information bit is set to Negative ACK (NACK), and
a contention window for the channel access procedure is adjusted using the HARQ-ACK feedback, wherein the second HARQ-ACK information bit is ignored.

### Claim 2

A base station which communicates with a user equipment (UE), the base station comprising:
higher layer processing circuitry configured to send radio resource control (RRC) configuration information, the RRC configuration information indicating that Physical Downlink Shared Channel Hybrid Automatic Repeat Request-Acknowledgment (PDSCH HARQ-ACK) codebook is semi static;
transmitting circuitry configured to, after a channel access procedure, transmit, to the UE, a PDSCH in a first slot and does not transmit, to the UE, any PDSCH in a second slot; and
receiving circuitry configured to receive, from the UE, a HARQ-ACK feedback including at least a first HARQ-ACK information bit and a second HARQ-ACK information bit, the first HARQ-ACK information bit corresponding to the PDSCH in the first slot, the second HARQ-ACK information bit corresponding to a PDSCH in the second slot;
wherein
the second HARQ-ACK information bit is set to Negative ACK (NACK), and
a contention window for the channel access procedure is adjusted using the HARQ-ACK feedback, wherein the second HARQ-ACK information bit is ignored.

### Claim 3

A base station which communicates with a user equipment (UE), the base station comprising:
higher layer processing circuitry configured to send first radio resource control (RRC) configuration information and second RRC configuration information, the first RRC configuration information indicating that Physical Downlink Shared Channel Hybrid Automatic Repeat Request-Acknowledgment (PDSCH HARQ-ACK) codebook is semi static, and the second RRC configuration indicating that PDSCH Aggregation Factor is set to N which is an integer greater than 1;
transmitting circuitry configured to, after a channel access procedure, transmit, to the UE, PDSCHs carrying a transport block in N slots; and
receiving circuitry configured to, for the transport block, receive, from the UE, only a HARQ-ACK information bit, the HARQ-ACK information bit corresponding to a last slot of the N slots;
wherein
a contention window for the channel access procedure is adjusted using a HARQ-ACK information for another slot of the N slots, wherein the HARQ-ACK information is assumed to be the same value as the HARQ-ACK information bit corresponding to the last slot of the N slots.

### Claim 4

A method for a base station which communicates with a user equipment (UE), the method comprising:
sending first radio resource control (RRC) configuration information, the first RRC configuration information indicating that Physical Downlink Shared Channel Hybrid Automatic Repeat Request-Acknowledgment (PDSCH HARQ-ACK) codebook is semi static;
sending second RRC configuration information, the second RRC configuration information indicating that a maximum number of codewords scheduled by DCI is two;
after a channel access procedure, transmitting, to the UE, a PDSCH which contains only a first transport block; and
receiving, from the UE, a HARQ-ACK feedback including at least a first HARQ-ACK information bit and a second HARQ-ACK information bit, the first HARQ-ACK information bit corresponding to the first transport block of the PDSCH;
wherein
the second HARQ-ACK information bit is set to Negative ACK (NACK), and
a contention window for the channel access procedure is adjusted using the HARQ-ACK feedback, wherein the second HARQ-ACK information bit is ignored.

### Claim 5

A method for a base station which communicates with a user equipment (UE), the method comprising:
sending radio resource control (RRC) configuration information, the RRC configuration information indicating that Physical Downlink Shared Channel Hybrid Automatic Repeat Request-Acknowledgment (PDSCH HARQ-ACK) codebook is semi static;
after a channel access procedure, transmitting, to the UE, a PDSCH in a first slot and does not transmit, to the UE, any PDSCH in a second slot; and
receiving, from the UE, a HARQ-ACK feedback including at least a first HARQ-ACK information bit and a second HARQ-ACK information bit, the first HARQ-ACK information bit corresponding to the PDSCH in the first slot, the second HARQ-ACK information bit corresponding to a PDSCH in the second slot;
wherein
the second HARQ-ACK information bit is set to Negative ACK (NACK), and
a contention window for the channel access procedure is adjusted using the HARQ-ACK feedback, wherein the second HARQ-ACK information bit is ignored.

### Claim 6

A method for a base station which communicates with a user equipment (UE), the method comprising:
sending first radio resource control (RRC) configuration information the first RRC configuration information indicating that Physical Downlink Shared Channel Hybrid Automatic Repeat Request-Acknowledgment (PDSCH HARQ-ACK) codebook is semi static;
sending second RRC configuration information, the second RRC configuration indicating that PDSCH Aggregation Factor is set to N which is an integer greater than 1;
after a channel access procedure, transmitting, to the UE, PDSCHs carrying a transport block in N slots; and
for the transport block, receiving, from the UE, only a HARQ-ACK information bit, the HARQ-ACK information bit corresponding to a last slot of the N slots;
wherein
a contention window for the channel access procedure is adjusted using a HARQ-ACK information for another slot of the N slots, wherein the HARQ-ACK information is assumed to be the same value as the HARQ-ACK information bit corresponding to the last slot of the N slots.