HARQ Codebook Generation for Multi-PDSCH Repetitions
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Solution Overview
Problem
Current wireless communication systems face challenges in managing and optimizing finite wireless channel resources due to signal attenuation and blocking in complex environments, particularly in providing effective hybrid automatic repeat request (HARQ) acknowledgement (ACK) feedback for multiple physical downlink shared channels (PDSCHs) with repetitions.
Innovation Solution
A method for wireless communications that involves receiving downlink control information (DCI) scheduling multiple PDSCHs for repetitions, monitoring for these repetitions in candidate reception occasions based on downlink slots and start and length indicator values (SLIVs), and transmitting HARQ-ACK feedback using a codebook generated according to these occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PDSCHs with repetitions are scheduled to improve communication reliability, then the reliability of wireless communication is improved, but the complexity of managing and optimizing wireless channel resources increases
Solution Approach 1:
The patent segments the HARQ-ACK feedback into separate parts: a first part for PDSCHs without repetitions and a second part for PDSCHs with repetitions. This segmentation allows independent management and optimization of feedback for different transmission scenarios, reducing the overall complexity of resource management while maintaining high reliability through comprehensive coverage of both cases.
Solution Approach 2:
The patent dynamically determines the set of candidate PDSCH reception occasions based on downlink slots and start and length indicator values (SLIVs). This dynamic approach allows the system to adapt to varying transmission configurations and optimize resource management in real-time, balancing reliability requirements with operational complexity.
2Reliability
If HARQ-ACK feedback is provided for multiple PDSCH repetitions to ensure reliable transmission, then the reliability is improved, but the loss of time in feedback processing increases
Solution Approach 1:
The patent determines the set of candidate PDSCH reception occasions in advance based on downlink slots and SLIVs, before the actual feedback transmission. This preliminary action allows the system to pre-configure feedback parameters and reduce real-time processing time while ensuring comprehensive coverage of all possible PDSCH reception scenarios for maintaining reliability.
Solution Approach 2:
By segmenting the feedback into first and second parts corresponding to different PDSCH configurations, the patent parallelizes the feedback processing logic. This segmentation enables independent handling of feedback for PDSCHs with and without repetitions, reducing the sequential processing time while maintaining complete feedback coverage for reliability.
3Reliability
If a comprehensive codebook is generated for all candidate PDSCH reception occasions to ensure complete feedback coverage, then the reliability is improved, but the quantity of feedback information increases
Solution Approach 1:
The patent segments the feedback codebook into two distinct parts: a first HARQ-ACK feedback part for PDSCHs without repetitions and a second HARQ-ACK feedback part for PDSCHs with repetitions. This segmentation provides comprehensive coverage for both transmission types while allowing optimized sizing and processing of each part, preventing unnecessary expansion of feedback information for scenarios that do not apply.
Solution Approach 2:
The patent applies different feedback strategies tailored to local requirements: complete feedback coverage for PDSCHs with repetitions (second part) while using appropriate feedback mechanisms for PDSCHs without repetitions (first part). This localized optimization ensures reliability where needed without uniformly increasing feedback quantity across all scenarios.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for determining and providing HARQ-ACK feedback corresponding to multiple PDSCHs scheduled by a DCI, which schedules a first PDSCH for transmitting repetitions of a first transport block (TB) and at least a second PDSCH for transmitting repetitions of a second TB. A UE monitors for repetitions of the first and the second PDSCH in a set of candidate PDSCH reception occasions corresponding to an uplink slot for transmitting the feedback. The set of candidate PDSCH reception occasions are based on a set of downlink slots corresponding to a reference repetition of each of the first TB and the second TB and a set of start and length indicator values (SLIVs) corresponding to the set of DL slots. The UE then transmits the feedback indicating results of the monitoring, based on a codebook generated according to the set of candidate PDSCH reception occasions.