Terminal Communication With Type-3 HARQ-ACK Slot Timing
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Solution Overview
Problem
Existing communication systems face inefficiencies in the reception and transmission of uplink and downlink transmissions, particularly in the handling of Type-3 HARQ-ACK codebooks, which affect the timing and scheduling of PDSCH and PUCCH in New Radio (NR) systems.
Innovation Solution
The terminal and base station apparatuses are designed to transmit and receive PUCCH based on K1 values derived from PDSCH-to-HARQ_feedback timing indicators or TDRA fields in DCI, adjusting the slot timing accordingly based on whether a PDSCH is scheduled, ensuring efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the terminal apparatus transmits PUCCH based on K1 derived from PDSCH-to-HARQ_feedback timing indicator in DCI, then the timing alignment between PDSCH and HARQ-ACK feedback is improved, but the complexity of determining the correct transmission slot increases when DCI does not schedule PDSCH
Solution Approach 1:
The patent applies preliminary action by pre-defining the slot determination rule for cases where DCI does not schedule PDSCH. Specifically, the terminal apparatus is configured to determine the PUCCH transmission slot as the slot after slots corresponding to K1 from the slot indicated by TDRA field in DCI. This pre-established rule eliminates the need for complex real-time judgment, resolving the contradiction between timing precision and determination complexity.
2Adaptability or versatility
If the system uses Type-3 HARQ-ACK codebook triggered by DCI, then the flexibility in HARQ-ACK feedback timing is improved, but the reliability of HARQ-ACK reception deteriorates due to potential timing conflicts
Solution Approach 1:
The patent applies dynamics by making the PUCCH transmission slot determination adaptive based on the scheduling status in DCI. When DCI schedules PDSCH, the PUCCH is transmitted in the K1-th slot after PDSCH reception slot; when DCI does not schedule PDSCH, the PUCCH is transmitted in the slot after slots corresponding to K1 from the DCI reception slot. This dynamic adjustment mechanism maintains timing flexibility while avoiding conflicts, thereby resolving the contradiction between adaptability and reliability.
Data Source
AI summary
A terminal apparatus includes a receiver configured to receive a PDCCH including DCI triggering a Type-3 HARQ-ACK codebook, and a transmitter configured to transmit a PUCCH including the Type-3 HARQ-ACK codebook triggered. A slot in which the PUCCH is transmitted is provided based on K1 obtained based on a PDSCH-to-HARQ_feedback timing indicator field included in the DCI. In a case that the DCI schedules a PDSCH, the PUCCH is transmitted the K1 slots after a slot in which the PDSCH is received. In a case that the DCI does not schedule a PDSCH, the PDCCH is transmitted in a slot after slots corresponding to the K1 from a slot in which the PDCCH is received.