Systems and methods for frequency-division duplex transmission time interval operation
A user equipment (UE) is described. The UE is configured to determine a duplex method of a serving cell. The UE is also configured to determine that shortened transmission time interval (sTTI) is configured on at least one of one or more downlink subframes or one or more uplink subframes. The UE is further configured to determine a sTTI downlink size and a sTTi uplink size. The UE is additionally configured to determine an association timing reference sTTI size based on the sTTI downlink size and the sTTI uplink size. The UE is also configured to determine a sTTI PDSCH HARQ-ACK transmission timing for the serving cell. The UE is further configured to determine a sTTI PUSCH scheduling timing for the serving cell. The UE is additionally configured to determine a sTTI PUSCH HARQ-ACK transmission timing for the serving cell.
1. A user equipment, comprising:
a processor; and
memory in electronic communication with the processor, wherein instructions stored in the memory are executable to:
obtain configuration of downlink (DL) shortened transmission time intervals (sTTIs) and uplink (UL) sTTIs, each of the DL sTTIs being shorter than any of the UL sTTIs; and
report, in a single UL sTTI of the UL sTTIs, Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK) for each shortened Physical Downlink Shared CHannel (sPDSCH) in a set of two or more of the DL sTTIs; wherein
the set of two or more of the DL sTTIs is mapped to the single UL sTTI, at least one DL sTTI of the set of two or more of the DL sTTIs has a length different from that of one or more remaining DL sTTIs of the set of two or more of the DL sTTIs, a sum total of lengths of the two or more of the DL sTTIs in the set of two or more of the DL sTTIs is 7 symbols, and a length of the single UL sTTI is 7 symbols.
2. A base station, comprising:
a processor; and
memory in electronic communication with the processor, wherein instructions stored in the memory are executable to:
send configuration of downlink (DL) shortened transmission time intervals (sTTIs) and uplink (UL) sTTIs, each of the DL sTTIs being shorter than any of the UL sTTIs; and
receive, in a single UL sTTI of the UL sTTIs, Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK) for each shortened Physical Downlink Shared CHannel (sPDSCH) in a set of two or more of the DL sTTIs; wherein
the set of two or more of the DL sTTIs is mapped to the single UL sTTI, at least one DL sTTI of the set of two or more of the DL sTTIs has a length different from that of one or more remaining DL sTTIs of the set of two or more of the DL sTTIs, a sum total of lengths of the two or more of the DL sTTIs in the set of two or more of the DL sTTIs is 7 symbols, and a length of the single UL sTTI is 7 symbols.
3. A method of a terminal device, the method comprising:
obtaining configuration of downlink (DL) shortened transmission time intervals (sTTIs) and uplink (UL) sTTIs, each of the DL sTTIs being shorter than any of the UL sTTIs; and
reporting, in a single UL sTTI of the UL sTTIs, Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK) for each shortened Physical Downlink Shared CHannel (sPDSCH) in a set of two or more of the DL sTTIs; wherein
the set of two or more of the DL sTTIs is mapped to the single UL sTTI, at least one DL sTTI of the set of two or more of the DL sTTIs has a length different from that of one or more remaining DL sTTIs of the set of two or more of the DL sTTIs, a sum total of lengths of the two or more of the DL sTTIs in the set of two or more of the DL sTTIs is 7 symbols, and a length of the single UL sTTI is 7 symbols.
4. A method of a base station, the method comprising:
sending configuration of downlink (DL) shortened transmission time intervals (sTTIs) and uplink (UL) sTTIs, each of the DL sTTIs being shorter than any of the UL sTTIs; and
receiving, in a single UL sTTI of the UL sTTIs, Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK) for each shortened Physical Downlink Shared CHannel (sPDSCH) in a set of two or more of the DL sTTIs; wherein
the set of two or more of the DL sTTIs is mapped to the single UL sTTI, at least one DL sTTI of the set of two or more of the DL sTTIs has a length different from that of one or more remaining DL sTTIs of the set of two or more of the DL sTTIs, a sum total of lengths of the two or more of the DL sTTIs in the set of two or more of the DL sTTIs is 7 symbols, and a length of the single UL sTTI is 7 symbols.