5G NR Downlink Prioritization for Overlapping PDSCH Scheduling
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Solution Overview
Problem
Current 5G NR specifications do not adequately consider UE processing timelines when handling overlapping configured and dynamic downlink transmissions, leading to unpredictable UE behavior and potential inefficiencies.
Innovation Solution
The UE prioritizes dynamic assignments over configured downlink assignments if the dynamic assignment PDCCH ends before the start of the configured PDSCH, and vice versa if the dynamic assignment PDCCH ends after the configured PDSCH begins, ensuring predictable UE behavior and network flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE follows current 5G NR specifications for handling overlapping configured and dynamic downlink transmissions, then network flexibility is maintained, but UE behavior becomes unpredictable and processing efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic prioritization rules that allow the UE to adaptively select between configured and dynamic PDSCH based on timing relationships. The UE dynamically determines which PDSCH to prioritize by evaluating whether the dynamic PDCCH ends before the configured PDSCH begins, enabling flexible yet predictable behavior in overlapping scenarios
Solution Approach 2:
The patent establishes preliminary prioritization criteria that the UE applies before processing overlapping PDSCH transmissions. By pre-defining the timing-based rules for prioritization, the UE can make deterministic decisions without ambiguity, improving both predictability and processing efficiency
2Reliability
If the UE prioritizes dynamic assignments over configured downlink assignments based on timing relationships, then UE behavior predictability improves, but processing complexity increases
Solution Approach 1:
The patent applies different prioritization rules based on local timing conditions. Specifically, the UE evaluates the timing relationship between the dynamic PDCCH and configured PDSCH locally, applying prioritization only when overlap is detected, rather than using a uniform complex rule set for all transmission scenarios
Solution Approach 2:
The patent segments the prioritization decision into distinct evaluation steps: first checking for overlap between dynamic PDCCH and configured PDSCH, then evaluating the timing relationship, and finally applying the appropriate prioritization rule. This segmented approach simplifies the overall complexity by breaking down the decision process into manageable conditions
Data Source
AI summary
Techniques disclosed herein efficiently address prioritization by a UE regarding its reception behavior with respect to a configured downlink transmission that is overlapped by a dynamic assignment and/or the dynamic downlink transmission scheduled via the dynamic assignment. In at least one embodiment having applicability to operation of the UE in a communication network based on the 5G NR specifications, the techniques disclosed herein provide for predictable behavior by the UE as to when the UE prioritizes a configured Physical Downlink Shared Channel (PDSCH) versus another PDSCH. Correspondingly, a radio network node may exploit the predictable behavior of the UE to override a configured PDSCH in favor of a dynamic PDSCH, by transmitting the Physical Downlink Control Channel (PDCCH) that schedules the dynamic PDSCH so that a timing relationship between the PDCCH and the configured PDSCH is satisfied.