SPS PDSCH Release Timing Alignment for 5G Collision Handling
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Solution Overview
Problem
The 5G-NR specifications face challenges in handling collisions and releases of semi-persistently scheduled physical downlink shared channels (PDSCHs), particularly in scenarios with multiple active configurations, leading to data loss and communication inefficiencies due to unclear order of collision and release handling rules.
Innovation Solution
The proposed method involves sequentially handling collisions between PDSCHs and then processing releases, ensuring that PDSCHs are received only if the end of the release PDCCH is after the end of the corresponding PDSCH reception, with ACK/NACK bits mapped to the same physical uplink control channel (PUCCH), and implementing joint release mechanisms to align the timing of release PDCCH with the end of PDSCH occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semi-persistently scheduled PDSCHs are released without considering timing overlap with release PDCCH, then release operation is simple, but data loss occurs and communication reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by checking the timing relationship between release PDCCH and SPS PDSCH before executing the release operation. The UE determines whether the end of the SPS PDSCH reception occasion overlaps with the end of the release PDCCH reception, and only releases the SPS configuration if there is no overlap. This preliminary timing check prevents data loss while maintaining clear handling rules.
2Productivity
If collision handling rules are not clearly defined, then system operation is simple, but data loss occurs and communication efficiency deteriorates
Solution Approach 1:
The patent segments the collision handling process into distinct steps: first determining whether the end of SPS PDSCH reception occasion overlaps with the end of release PDCCH reception, then based on the overlap determination, either releasing the SPS configuration or maintaining it. This segmented approach provides clear, actionable rules that improve communication efficiency while avoiding ambiguous scenarios.
3Adaptability or versatility
If multiple SPS configurations are handled without joint release mechanism, then individual configuration management is simple, but network flexibility deteriorates and time consumption increases
Solution Approach 1:
The patent enables joint release of multiple SPS configurations by allowing the release PDCCH to indicate multiple SPS configuration indices simultaneously. The UE processes the release operation for all indicated configurations based on the same timing overlap criterion, reducing the number of separate release operations needed and improving network flexibility while maintaining efficient time consumption.
Data Source
AI summary
A method for releasing a semi-persistently scheduled (SPS) physical downlink shared channel (PDSCH) includes: receiving, by a PDSCH manager of a user equipment, a SPS release physical downlink control channel (PDCCH) in a scheduling cell, the SPS release PDCCH identifying N SPS PDSCH configuration indices to be released; identifying a slot of a scheduled cell, where the slot of the scheduled cell overlaps with the end of an ending symbol of the SPS release PDCCH; identifying M SPS PDSCH configuration indices including all configuration indices from among the N SPS PDSCH configuration indices that are scheduled in the slot; and releasing L SPS PDSCH configuration indices among the M SPS PDSCH configuration indices based on determining that the ending symbol of the SPS release PDCCH is before a corresponding ending symbol associated with each of the L SPS PDSCH configuration indices of the slot.