# US 10,873,437 B2 · Systems and methods for frequency-division duplex transmission time interval operation

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- Number: US 10,873,437 B2
- Document ID: US10873437B2
- Status: Granted
- Kind: B2
- Application number: 15/673,128
- Filed: 2017-08-09
- Published: 2018-02-15
- Granted: 2020-12-22
- Earliest claimed: 2016-08-11
- Assignees: Sharp Kabushiki Kaisha; FG Innovation Company Limited
- Applicants: Sharp Kabushiki Kaisha; FG Innovation Company Limited
- Inventors: Zhanping Yin; Toshizo Nogami
- Web page: https://patentgrep.com/patent/US10873437B2

## CPC

- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04L 1/1887: {Scheduling and prioritising arrangements}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/1268: of uplink data flows
- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- 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 user equipment (UE) is described. The UE includes a processor and memory in electronic communication with the processor. The UE configures shortened transmission time interval (sTTI) for downlink in a serving cell. The UE also determines a downlink (DL) association set for an uplink subframe. The UE further determines a shortened physical uplink control channel (SPUCCH) format or a PUCCH format used in the uplink subframe, on the basis of at least the number of downlink sTTI(s) within the DL association set.

## Claims

### Claim 1

A user equipment (UE), comprising:
receiving circuitry configured to receive a physical downlink shared channel (PDSCH); and
transmitting circuitry configured to transmit a physical uplink control channel (PUCCH); wherein
if a downlink (DL) shortened transmission time interval (sTTI) is smaller than an uplink (UL) sTTI, and if a larger-size PUCCH format is configured, (i) a smaller-size PUCCH format is used when one PDSCH is detected and (ii) whether the larger-size PUCCH format thus configured or the smaller-size PUCCH format is used for the UL sTTI which is larger than the DL sTTI depends on the number of detected PDSCH(s).

### Claim 2

A base station apparatus, comprising:
transmitting circuitry configured to transmit a physical downlink shared channel (PDSCH);
receiving circuitry configured to receive a physical uplink control channel (PUCCH) from a user equipment (UE); and
configuring circuitry configured to configure, for the UE, a downlink (DL) shortened transmission time interval (sTTI) and an uplink (UL) sTTI;
wherein
if the downlink (DL) shortened transmission time interval (sTTI) is smaller than the uplink (UL) sTTI, and if the configuring circuitry further configures a larger-size PUCCH format for the UE, (i) the receiving circuitry receives, from the UE, the PUCCH using a smaller-size PUCCH format when the PUCCH corresponds to one PDSCH and (ii) whether the larger-size PUCCH format thus configured or the smaller-size PUCCH format is used for the UL sTTI which is larger than the DL sTTI depends on the number of detected PDSCH(s).

### Claim 3

A method for a user equipment (UE), the method comprising:
receiving a physical downlink shared channel (PDSCH); and
transmitting a physical uplink control channel (PUCCH); wherein
if a downlink (DL) shortened transmission time interval (sTTI) is smaller than an uplink (UL) sTTI, and if a larger-size PUCCH format is configured, (i) a smaller-size PUCCH format is used when one PDSCH is detected and (ii) whether the larger-size PUCCH format thus configured or the smaller-size PUCCH format is used for the UL sTTI which is larger than the DL sTTI depends on the number of detected PDSCH(s).

### Claim 4

A method for a base station apparatus, the method comprising:
transmitting a physical downlink shared channel (PDSCH);
receiving a physical uplink control channel (PUCCH) from a user equipment (UE); and
configuring, for the UE, a downlink (DL) shortened transmission time interval (sTTI) and an uplink (UL) sTTI; wherein
if the downlink (DL) shortened transmission time interval (sTTI) is smaller than the uplink (UL) sTTI, and if the configuring includes configuring a larger-size PUCCH format for the UE, (i) the receiving includes receiving, from the UE, the PUCCH using a smaller-size PUCCH format when the PUCCH corresponds to one PDSCH and (ii) whether the larger-size PUCCH format thus configured or the smaller-size PUCCH format is used for the UL sTTI which is larger than the DL sTTI depends on the number of detected PDSCH(s).