Uplink BWP Switching Control for HARQ Retransmission Timing
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Solution Overview
Problem
Current wireless communication systems fail to consider processing timing requirements for autonomous retransmissions in Industrial Internet-of-Things (I-IoT) devices, leading to delayed data transmission due to de-prioritized uplink grants and undefined UE behavior during bandwidth part switching.
Innovation Solution
Implementing UE-initiated retransmission handling by checking the prioritization status of the previous uplink grant and considering processing time requirements, prioritizing dynamic retransmissions over autonomous retransmissions, and canceling retransmissions during bandwidth part switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE deprioritizes a configured uplink grant when a higher priority transmission overlaps, then collision avoidance is improved, but data transmission delay increases for low-periodicity grants
Solution Approach 1:
The UE performs preliminary assessment of the configured uplink grant timing relative to the higher priority transmission. By checking whether the CG occurs before or after the higher priority transmission and evaluating processing time requirements, the UE proactively determines whether autonomous retransmission is feasible, preventing delays while avoiding collisions.
Solution Approach 2:
The UE dynamically adjusts its transmission behavior based on real-time conditions. When a higher priority transmission overlaps with a configured grant, the UE evaluates processing time requirements and BWP switching status to dynamically decide whether to perform autonomous retransmission on the same or different BWP, optimizing both collision avoidance and transmission timing.
2Productivity
If the UE performs autonomous retransmission without considering processing time requirements, then retransmission speed is improved, but transmission reliability deteriorates due to insufficient processing
Solution Approach 1:
The UE performs preliminary verification of processing time requirements before executing autonomous retransmission. By checking whether sufficient processing time is available between the configured grant and the retransmission timing, the UE ensures that data is fully prepared and processed, maintaining transmission reliability while enabling timely retransmission.
3Duration of action of stationary object
If the UE continues retransmission after BWP switching, then data transmission continuity is improved, but resource allocation errors increase due to BWP mismatch
Solution Approach 1:
The UE dynamically monitors BWP switching events and adjusts retransmission behavior accordingly. When a BWP switch is detected, the UE checks whether the previously configured grant applies to the new active BWP. If the CG was on a different BWP, the UE prevents erroneous retransmission; if the CG applies to the current BWP, the UE continues retransmission, ensuring both continuity and accuracy.
4Measurement precision
If the UE checks prioritization status and processing time for each retransmission, then transmission accuracy is improved, but computational complexity increases
Solution Approach 1:
The UE segments the retransmission decision process into distinct evaluation stages: checking prioritization status of the previous grant, verifying processing time requirements, monitoring BWP switching events, and determining autonomous retransmission eligibility. This structured segmentation improves timing accuracy while managing computational complexity through systematic organization of checks.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for handling autonomous retransmission. One apparatus includes a transceiver that operates on a first BWP. The apparatus includes a processor that generates a first MAC PDU for transmission on a first CG associated with a first HARQ process. The processor deprioritizes the first CG in response to detecting a higher priority UL transmission overlapping with the first CG. The processor switches an active BWP from the first BWP to a second BWP after deprioritizing the first CG. The processor prevents the first HARQ process from triggering a transmission of the first MAC PDU on a second CG associated with the first HARQ process on the second BWP.