Terminal CORESET Indexing for Multi-TRP HARQ-ACK Feedback
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Solution Overview
Problem
In the context of multi-TRP scenarios in NR, the determination of Type-2 HARQ-ACK codebook bits and PUCCH resources for joint HARQ-ACK feedback is not sufficiently clarified, leading to potential throughput degradation and communication quality deterioration.
Innovation Solution
A method for determining HARQ-ACK feedback by indexing PDCCH monitoring occasions and PUCCH resources based on CORESET pool indices, where the UE prioritizes monitoring occasions and resources for joint feedback, using specific indexing rules for Type-2 HARQ-ACK codebook configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If joint HARQ-ACK feedback is configured for multi-TRP, then feedback efficiency is improved, but the determination of Type-2 HARQ-ACK codebook bits and PUCCH resources becomes unclear
Solution Approach 1:
The patent applies parameter changes by introducing specific indexing rules for Type-2 HARQ-ACK codebook determination. The UE determines the number of bits based on PDCCH monitoring occasions indexed by CORESET pool index values (0 and 1), and PUCCH resources are selected based on the indexed monitoring occasion. This transforms the unclear codebook determination into a systematic parameter-based approach.
2Productivity
If multi-TRP joint feedback is implemented, then communication capacity is improved, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the HARQ-ACK feedback system into distinct segments based on CORESET pool index values. The UE separately indexes PDCCH monitoring occasions for CORESET pool index 0 and 1, determines codebook bits for each segment, and selects PUCCH resources accordingly. This segmentation simplifies the overall system complexity by creating manageable, standardized sub-components.
Solution Approach 2:
The patent uses parameter changes to manage system complexity by establishing clear indexing rules. The CORESET pool index parameter (0 or 1) serves as a key differentiator that systematically organizes the multi-TRP feedback process, making the complex system manageable through parameter-based control.
3Adaptability or versatility
If Type-2 HARQ-ACK codebook is used for joint feedback, then feedback flexibility is improved, but determination accuracy of codebook bits deteriorates
Solution Approach 1:
The patent resolves the accuracy issue by introducing explicit parameter-based determination rules for Type-2 codebook bits. The number of bits is determined based on the indexed PDCCH monitoring occasions, where the index is derived from the CORESET pool index value and the monitoring occasion number. This parameterization ensures both flexibility and precision.
Solution Approach 2:
The patent applies feedback mechanisms by establishing a systematic relationship between the indexed monitoring occasions and the codebook bit determination. The UE uses the indexing result to accurately determine both the number of bits and their values, creating a closed-loop feedback determination process that ensures accuracy.
Data Source
AI summary
A terminal according to one aspect of the present disclosure has a control section that judges indexing of Physical Downlink Control Channel (PDCCH) monitoring occasions or Downlink Control Information (DCI) formats associated with joint feedback, when the terminal is not provided with any CORESET pool index or is provided with a CORESET pool index with a value of “0” for one or more first control resource sets (COntrol REsource SETs (CORESETs)) and is provided with a CORESET pool index with a value of “1” for one or more second CORESETs on an active Downlink Bandwidth Part (DL BWP) of a serving cell, and Acknowledgement (ACK)/Negative Acknowledgement (ACNACK) feedback mode=joint feedback is provided for the serving cell, and a transmitting section that transmits a HARQ-ACK using a Hybrid Automatic Repeat reQuest (HARQ)-ACK codebook or Physical Uplink Control Channel (PUCCH) resource determined based on the indexing. According to one aspect of the present disclosure, in the case of using multi-panel/TRP, it is possible to suitably perform HARQ-ACK feedback.