HARQ-ACK Feedback Generation Using Segmented PDCCH Monitoring Occasions
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Solution Overview
Problem
In 5G NR wireless communication systems, constructing a Type 1 HARQ-ACK codebook for PDSCH based on DCI format 1_2 is challenging due to non-uniqueness of TDRA candidates within a slot, leading to inconsistencies in resource allocation and feedback generation.
Innovation Solution
The method involves determining the maximum number of non-overlapping TDRA candidates within a slot and mapping PDSCH occurrences to corresponding bits in the HARQ-ACK codebook, considering multiple PDCCH monitoring occasions as reference points, to generate accurate HARQ-ACK feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TDRA candidates are defined with respect to PDCCH monitoring occasions as reference points, then the system supports flexible resource allocation and multiple monitoring occasions, but the TDRA candidates become non-unique within a slot, leading to inconsistencies in resource allocation and feedback generation
Solution Approach 1:
The patent segments the slot into multiple PDCCH monitoring occasions and defines TDRA candidates relative to each monitoring occasion's starting symbol. This segmentation allows the system to maintain multiple reference points (one per monitoring occasion) while systematically managing the non-uniqueness of TDRA candidates within the slot, thereby preserving flexibility while enabling consistent feedback generation through structured segmentation.
2Quantity of substance
If multiple PDCCH monitoring occasions are used as reference points, then more PDSCH occurrences can be accommodated, but determining the maximum number of non-overlapping TDRA candidates becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-configuring the set of PDCCH monitoring occasions and their starting symbols before determining TDRA candidates. The UE first identifies all monitoring occasions within the slot, then uses these pre-established reference points to systematically determine TDRA candidates. This preliminary setup simplifies the subsequent determination process by providing a fixed framework of reference points, reducing the complexity of handling multiple PDSCH occurrences.
3Reliability
If TDRA values are defined with respect to slot start, then TDRA candidates are unique within the slot, but this approach does not support flexible PDCCH monitoring occasions at different positions within the slot
Solution Approach 1:
The patent implements dynamics by making the TDRA candidate definition adaptive to the actual PDCCH monitoring occasion positions within the slot. Instead of using a fixed slot-start reference, the system dynamically adjusts the reference point to the starting symbol of each monitoring occasion. This dynamic approach allows TDRA candidates to be uniquely defined relative to their specific monitoring occasion context, simultaneously supporting both uniqueness and flexibility for multiple monitoring occasions at different positions.
Data Source
AI summary
This disclosure provides systems, devices, apparatus and methods, including computer programs encoded on storage media, for TDRA-based HARQ-ACK feedback generation. In aspects, a UE and a base station may determine that at least one TDRA candidate of a set of TDRA candidates for a PDSCH transmitted from a base station has more than one possible location within a slot. Based on the determination that the at least one TDRA candidate has more than one possible location within the slot, the UE may generate and transmit corresponding HARQ-ACK feedback to the base station, which may decode the HARQ-ACK feedback.