PUSCH Transmission Cancellation Timing for Overlapping UL Grants
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Solution Overview
Problem
In wireless communication systems, UEs face challenges in efficiently managing the cancellation of PUSCH transmissions when high-priority and low-priority UL transmissions overlap, particularly in determining the appropriate termination time for low-priority transmissions based on DFI and PDCCH scheduling.
Innovation Solution
The method involves determining a cancellation time for PUSCH transmissions by considering both the DFI and PDCCH scheduling indications, allowing for timely cancellation of low-priority transmissions to accommodate overlapping high-priority transmissions, thereby optimizing resource allocation and minimizing processing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE terminates repetitions of a transport block based on DFI indicating ACK, then the transmission can be ended promptly, but the UE may not have sufficient processing time to switch to high-priority transmissions
Solution Approach 1:
The patent implements dynamic adjustment of termination timing based on priority levels. When a high-priority transmission is detected, the UE dynamically extends the termination time of low-priority repetitions beyond the standard N2 symbols, allowing sufficient processing time for priority-based resource reallocation while maintaining prompt termination for normal operations
Solution Approach 2:
The patent changes the termination parameter from a fixed N2 symbol delay to a variable delay that depends on priority conditions. The termination time is adjusted based on whether high-priority transmissions are present, transforming a static parameter into a context-dependent value that optimizes both response time and processing capability
2Productivity
If the UE cancels low-priority UL transmission to accommodate high-priority transmission, then resource allocation efficiency improves, but the cancellation timing becomes complex due to multiple DCI indications
Solution Approach 1:
The patent segments the cancellation determination process into distinct phases: first identifying overlapping high-priority transmissions, then calculating separate cancellation times for each DCI indication (DFI-based N2 delay and UL grant-based Tproc,2+d1 delay), and finally selecting the appropriate cancellation time. This segmentation simplifies the complex decision-making by breaking it into manageable steps
Solution Approach 2:
The patent introduces an intermediary comparison mechanism that evaluates multiple cancellation time candidates against each other and against the actual transmission timeline. This intermediary process mediates between conflicting DCI indications and determines the final cancellation time, reducing the complexity of direct multi-DCI conflict resolution
3Reliability
If the UE extends processing time by d2 symbols for high-priority channels, then processing reliability improves, but the overall transmission latency increases
Solution Approach 1:
The patent applies extended processing time (d2 symbols) locally only to high-priority transmissions when necessary, rather than uniformly to all transmissions. The extension is selectively applied based on priority detection and overlap conditions, ensuring reliability enhancement where needed while minimizing impact on overall system latency
Solution Approach 2:
The patent applies processing time extension partially - only when high-priority transmissions overlap with low-priority repetitions. The d2 symbol extension is not always applied but only in specific scenarios where priority-based preemption occurs, avoiding unnecessary latency additions while ensuring sufficient processing time when required
Data Source
AI summary
A configured grant configuration including resources for uplink data transmissions can be received (310). A PUSCH transmission corresponding to the configured grant configuration can be prepared (320). A transport block of the PUSCH transmission can correspond to a HARQ process and can be prepared to be repeated a number of times in a first set of resources configured for the PUSCH transmission. A first DCI indicating an ACK for the HARQ process corresponding to the transport block can be received (330). A second DCI indicating a second set of resources can be received (340). The first set of resources and the second set of resources overlap in the time domain. A cancellation time associated with the PUSCH transmission can be determined (350) based on both the received first DCI and the received second DCI. The PUSCH transmission can be cancelled (360) according to the cancellation time.