Codebook design for semi-persistent scheduling (SPS) transmissions

A user equipment (UE), comprising a memory and one or more processors configured to, when executing instructions stored in the memory, cause the UE to:

• identify a physical uplink control channel (PUCCH) resource in a slot for communicating a hybrid automatic repeat request (HARQ) codebook that provides feedback about semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) receptions in a plurality of slots that precede or include the slot;
• and
• determine a set of SPS PDSCH receptions and dynamic grant PDSCH receptions scheduled for the plurality of slots for which feedback is multiplexed in the HARQ codebook based on SPS PDSCH configurations for each component carrier and each of the plurality of slots, a UE capability for number of SPS PDSCH receptions per slot (N), and a priority of the SPS PDSCH configurations, and a priority of the dynamic grant PDSCH receptions;
• determining whether a priority level is assigned to the SPS PDSCH configurations;
• and
• when at least one dynamic grant PDSCH is scheduled for any of the plurality of slots and a priority level is not assigned to the SPS PDSCH configurations, selecting cither a Type 1 HARQ codebook or a Type 2 HARQ codebook;
• construct the HARQ codebook based on the set of SPS PDSCH receptions and the selected codebook type;
• and
• transmit the HARQ codebook to a base station.

A user equipment (UE), comprising a memory and one or more processors configured to, when executing instructions stored in the memory, cause the UE to:

• identify a physical uplink control channel (PUCCH) resource in a slot for communicating a hybrid automatic repeat request (HARQ) codebook that provides feedback about semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) receptions in a plurality of slots that precede or include the slot;
• and
• determine a set SPS PDSCH receptions for which feedback is multiplexed in the HARQ codebook by
• identifying a set L that includes SPS PDSCH configurations for the slot for all configured component carriers, wherein each SPS PDSCH configuration is assigned an index value that is indicative of priority,
• removing SPS PDSCH configurations that collide with an uplink symbol from the set L,
• initializing a set S of occupied symbols in the slot to be null,
• initializing a counter C of SPS PDSCH configurations selected as SPS PDSCH receptions to zero,
• initializing a set F of SPS PDSCH configuration index values having corresponding PDSCH selected as SPS PDSCH receptions to null,
• until C is equal to a number (N) of UE capability for number of SPS PDSCH receptions per slot or all SPS PDSCH configurations in the set L are considered:
• identify a SPS PDSCH configuration in the set L having a lowest configuration index value,
• determine if the SPS PDSCH configuration includes a symbol in set S,
• when the SPS PDSCH configuration does not include a symbol in set S:
• add the SPS PDSCH configuration index value to the set F,
• increment the counter C and the counter C, and
• add symbols occupied by the SPS PDSCH configuration to the set S;
• separate the set F into a set of high priority SPS PDSCH receptions Fhigh and a set of low priority SPS PDSCH receptions Flow based on the SPS PDSCH configuration index values;
• and
• separate the set S into a set of symbols occupied by high priority SPS PDSCH receptions Shigh and a set of symbols occupied by low priority SPS PDSCH receptions Slow based on the SPS PDSCH configuration index values,
• select a codebook type based on whether a PDSCH is scheduled by way of a dynamic grant for any of the plurality of slots;
• construct the HARQ codebook based on the set of SPS PDSCH receptions and the selected codebook type;
• and
• transmit the HARQ codebook to a base station.