Systems and methods for frequency-division duplex transmission time interval operation
AssigneesSharp Kabushiki Kaisha, FG Innovation Company Limited
InventorsZhanping Yin, Toshizo Nogami
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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.
Claims4
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).
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).
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).
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).
Dependencies are inferred from the claim text.