PDSCH Feedback Handling for Skipped Downlink Transmissions
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Solution Overview
Problem
Wireless communication systems face challenges in managing feedback for skipped and non-skipped physical downlink shared channel (PDSCH) transmissions due to overlapping semi-static uplink symbols, leading to reduced data rates and spectral efficiency.
Innovation Solution
A user equipment (UE) is configured to detect skipped PDSCH transmissions based on time domain overlaps with semi-static uplink symbols and transmit feedback considering codebook selection, A/N bit ordering, time domain bundling, and K1 counting, ensuring accurate feedback for both skipped and non-skipped PDSCH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE transmits feedback for all scheduled PDSCH transmissions including skipped ones, then the feedback completeness is improved, but the feedback accuracy deteriorates because skipped transmissions cannot be properly acknowledged
Solution Approach 1:
The feedback mechanism is segmented into separate handling for skipped PDSCH transmissions and non-skipped PDSCH transmissions. The UE identifies skipped transmissions by detecting overlaps with semi-static uplink symbols and processes feedback for these separately, allowing accurate acknowledgment only for successfully received transmissions while maintaining comprehensive feedback coverage
Solution Approach 2:
Instead of attempting to provide feedback for skipped transmissions (which is inherently problematic), the invention inverts the approach by explicitly identifying and excluding skipped transmissions from feedback requirements. The UE determines which transmissions were actually received by checking against semi-static uplink symbol overlaps, and only provides feedback for those confirmed received transmissions
2Productivity
If the network entity schedules multiple PDSCH transmissions in parallel, then the data rate is improved, but the complexity of managing feedback for skipped and non-skipped transmissions increases
Solution Approach 1:
The UE performs preliminary identification of skipped PDSCH transmissions by checking for overlaps with semi-static uplink symbols before generating feedback. This preliminary action of detecting skipped transmissions based on pre-configured uplink symbol patterns simplifies the overall feedback management process by pre-filtering which transmissions require feedback
Solution Approach 2:
The invention implements a refined feedback mechanism where the UE provides separate feedback indications for skipped PDSCH transmissions versus non-skipped PDSCH transmissions. This structured feedback approach, combined with codebook-based reporting, manages the complexity of multi-PDSCH feedback by organizing acknowledgments in a systematic manner that the network can efficiently process
3Reliability
If the UE skips PDSCH transmissions that overlap with semi-static uplink symbols, then the uplink transmission reliability is improved, but the overall spectral efficiency deteriorates due to lost downlink data
Solution Approach 1:
The invention converts the harmful effect of skipped PDSCH transmissions (lost downlink data) into a benefit by implementing a feedback mechanism that explicitly notifies the network of skipped transmissions. This allows the network to perform accurate retransmissions only for transmissions that were actually skipped, improving overall spectral efficiency by avoiding redundant retransmissions of successfully received data while maintaining uplink reliability
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for wireless communication performed by a user equipment (UE). The UE may receive, from a network entity, downlink control information (DCI) that schedules a multiple physical downlink shared channel (multi-PDSCH) grant for a plurality of PDSCH transmissions. The UE may detect one or more skipped PDSCH transmissions of the plurality of PDSCH transmissions based at least in part on an overlap in a time domain with semi-static uplink symbols. The UE may transmit, to the network entity, feedback for one or more of: the one or more skipped PDSCH transmissions or one or more non-skipped PDSCH transmissions of the plurality of PDSCH transmissions.