PDCCH Repetition Feedback Validity Determination
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing downlink feedback information (DFI) with physical downlink control channel (PDCCH) repetition, particularly in determining the validity of feedback information for physical uplink shared channel (PUSCH) transmissions.
Innovation Solution
A mobile station is configured to receive a set of PDCCH candidates linked for repetition, detect downlink control information (DCI) carrying DFI, identify a reference PDCCH candidate based on specific criteria, and determine the validity of feedback information for a corresponding HARQ process number in the DFI, based on the timing relationship with the last symbol of the PUSCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH repetition is implemented to improve reliability of control information delivery, then the reliability of feedback information determination is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring a set of PDCCH candidates and establishing reference criteria before feedback determination is needed. The UE identifies a reference PDCCH candidate from pre-defined criteria (such as earliest starting symbol, latest ending symbol, or specific candidate index), which simplifies the subsequent feedback validity check by providing a predetermined reference point for timing comparison.
Solution Approach 2:
The patent segments the feedback validity determination process into distinct steps: (1) receiving multiple PDCCH candidates, (2) identifying a reference candidate based on specific criteria, (3) comparing PUSCH timing against the reference PDCCH timing, and (4) determining feedback validity based on the comparison. This segmentation makes the complex reliability verification process more manageable and implementable.
2Reliability
If multiple PDCCH candidates are monitored for repetition, then the reliability of control information reception is improved, but the processing time and complexity increase
Solution Approach 1:
The patent reduces processing time by performing preliminary identification of the reference PDCCH candidate from the set of monitored candidates. By establishing reference criteria in advance (such as selecting the candidate with the earliest starting symbol or latest ending symbol), the UE avoids complex real-time comparisons and can quickly determine which PDCCH serves as the reference for feedback validity checking.
Solution Approach 2:
The patent changes the parameter used for reference selection from complex multi-dimensional comparisons to simpler temporal parameters. By using criteria based on symbol timing (earliest starting symbol, latest ending symbol, or specific time position), the system transforms the reference identification process into a straightforward parameter-based selection, reducing processing complexity and time.
3Measurement precision
If feedback information validity is determined based on timing relationship with reference PDCCH, then the precision of feedback processing is improved, but the device complexity increases
Solution Approach 1:
The patent improves measurement precision by using explicit timing relationship parameters between the PUSCH transmission and the reference PDCCH candidate. The feedback validity is determined based on measurable parameters such as the time difference in symbols between the PUSCH last symbol and the reference PDCCH first symbol, providing objective and precise validation criteria.
Solution Approach 2:
The patent applies local quality by focusing the validity determination on specific local timing characteristics rather than global complex analysis. The reference PDCCH candidate is selected based on local temporal properties (such as earliest starting symbol or latest ending symbol within the set), and feedback validity is determined by local timing relationships, simplifying the overall device complexity while maintaining precision.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a mobile station may receive a set of physical downlink control channel (PDCCH) candidates, wherein the set of PDCCH candidates are linked for PDCCH repetition. The mobile station may detect downlink control information (DCI) carrying downlink feedback information (DFI) in one or more PDCCH candidates. The mobile station may identify a PDCCH candidate as a reference PDCCH candidate based at least in part on the PDCCH candidate satisfying one or more criteria. The mobile station may determine whether the DFI is valid for a physical uplink shared channel (PUSCH) transmission based at least in part on whether a last symbol of the PUSCH transmission is at least a particular quantity of symbols prior to a first symbol of the reference PDCCH candidate. Numerous other aspects are described.