Method, UE and Basestation for Reporting/Receiving HARQ ACK/NACK for PDSCH in Dynamic TDD Configurations

A method used in a User Equipment, UE, for reporting Hybrid Automatic Repeat Request, HARQ, acknowledgement, ACK, /non-acknowledgement, NACK, for Physical Downlink Shared Channels, PDSCHs, in dynamic time division duplex, TDD, configurations, the method comprising:

• receiving a plurality of PDSCHs in DownLink, DL, subframes associated with an UpLink, UL, subframe and indicated by a DL reference TDD configuration;
• for each of the received PDSCHs,
• reporting HARQ ACK/NACK by at least partially using PUCCH resources indicated by Downlink Control Information, DCI, and/or Radio Resource Control, RRC, signaling,
• dividing the DL subframes into a first subset of DL subframes and a second subset of DL subframes, wherein the first subset of DL subframes is also indicated by an UL reference TDD configuration;
• assigning a set of Physical Uplink Control Channel, PUCCH, resource indices based on resources used in transmission of Physical Downlink Control Channels, PDCCHs, corresponding to the PDSCHs received in the DL subframes of the first subset of DL subframes;
• for each of the PDSCHs received in the DL subframes of the first subset of DL subframes, reporting HARQ ACK/NACK using PUCCH resources in an order of the assigned set of PUCCH resource indices;
• and
• for each of the PDSCHs received in the DL subframes of the second subset of DL subframes, reporting HARQ ACK/NACK using PUCCH resources indicated by DCI and/or RRC signaling.

A User Equipment, UE, for reporting Hybrid Automatic Repeat Request, HARQ, acknowledgement, ACK, or non-acknowledgement, NACK, for Physical Downlink Shared Channels, PDSCHs, in dynamic time division duplex, TDD, configurations, the UE comprising a receiver, a transmitter, a memory and a processor, wherein:

• the memory is configured to store TDD configurations;
• the processor is configured to control the receiver to receive a plurality of PDSCHs in DownLink (DL) subframes associated with an UpLink (UL) subframe and indicated by a DL reference TDD configuration;
• the processor is configured to divide the DL subframes into a first subset of DL subframes and a second subset of DL subframes, wherein the first subset of DL subframes is also indicated by an UL reference TDD configuration;
• the processor is configured to assign a set of Physical Uplink Control Channel, (PUCCH, resource indices based on resources used in transmission of Physical Downlink Control Channels, PDCCHs, corresponding to the PDSCHs received in the DL subframes of the first subset of DL subframes;
• the processor is configured to control the transmitter to, for each of the PDSCHs received in the DL subframes of the first subset of DL subframes, report HARQ ACK/NACK using PUCCH resources in an order of the assigned set of PUCCH resource indices;
• and
• the processor is configured to control the transmitter to, for each of the PDSCHs received in the DL subframes of the second subset of DL subframes, report HARQ ACK/NACK using PUCCH resources indicated by DCI and/or RRC signaling.

A method used in a Base Station, BS, for receiving Hybrid Automatic Repeat Request, HARQ, acknowledgement, ACK, /non-acknowledgement, NACK, for Physical Downlink Shared Channels, PDSCHs, in dynamic time division duplex, TDD, configurations, the method comprising:

• transmitting a plurality of PDSCHs in DownLink, DL, subframes associated with an UpLink, UL, subframe and indicated by a DL reference TDD configuration;
• for each of the transmitted PDSCHs, receiving HARQ ACK/NACK at least partially on PUCCH resources indicated by Downlink Control Information, DCI, and/or Radio Resource Control, RRC, signaling,
• dividing the DL subframes into a first subset of DL subframes and a second subset of DL subframes, wherein the first subset of DL subframes is also indicated by an UL reference TDD configuration;
• assigning a set of Physical Uplink Control Channel, PUCCH, resource indices based on resources used in transmission of Physical Downlink Control Channels, PDCCHs, corresponding to the PDSCHs transmitted in the DL subframes of the first subset of DL subframes;
• for each of the PDSCHs transmitted in the DL subframes of the first subset of DL subframes, receiving HARQ ACK/NACK on PUCCH resources in an order of the assigned set of PUCCH resource indices;
• and
• for each of the PDSCHs transmitted in the DL subframes of the second subset of DL subframes, receiving HARQ ACK/NACK on PUCCH resources indicated by DCI and/or RRC signaling.

A Base Station, BS, for receiving Hybrid Automatic Repeat Request, HARQ, acknowledgement, ACK, or non-acknowledgement, NACK, for Physical Downlink Shared Channels, PDSCHs, in dynamic time division duplex, TDD, configurations, the BS comprising a receiver, a transmitter, a memory and a processor, wherein:

• the memory is configured to store TDD configurations;
• the processor is configured to control the transmitter to transmit a plurality of PDSCHs in DownLink, DL, subframes associated with an UpLink, UL, subframe and indicated by a DL reference TDD configuration;
• the processor is configured to divide the DL subframes into a first subset of DL subframes and a second subset of DL subframes, wherein the first subset of DL subframes is also indicated by an UL reference TDD configuration;
• the processor is configured to assign a set of Physical Uplink Control Channel, PUCCH, resource indices based on resources used in transmission of Physical Downlink Control Channels, PDCCHs, corresponding to the PDSCHs transmitted in the DL subframes of the first subset of DL subframes;
• the processor is configured to control the receiver to, for each of the PDSCHs transmitted in the DL subframes of the first subset of DL subframes, receive HARQ ACK/NACK on PUCCH resources in an order of the assigned set of PUCCH resource indices;
• and
• the processor is configured to control the receiver to, for each of the PDSCHs transmitted in the DL subframes of the second subset of DL subframes, receive HARQ ACK/NACK on PUCCH resources indicated by DCI and/or RRC signaling.