Uplink Control Channel Overlap Handling via Priority-Based Dropping
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Solution Overview
Problem
In wireless communication systems, overlapping resources for single-slot and multi-slot uplink control channel transmissions cause challenges in handling overlaps, leading to system performance degradation, particularly when multiple HARQ processes or periodic CSI transmission configurations are involved.
Innovation Solution
Implementing dropping rules that determine which transmission to drop based on priority, ensuring that the wireless device drops the transmission with lower priority, thereby minimizing performance impact, with specific rules for when transmissions have different or the same priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both single-slot and multi-slot uplink control channel transmissions are scheduled in overlapping time slots, then the wireless device must handle resource conflict, but system performance degrades due to inability to transmit both transmissions simultaneously
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmission parameters based on priority levels. When overlap is detected, the system changes the transmission state parameter (drop or transmit) based on the priority parameter of the UCI, allowing critical information to be transmitted while non-critical information is dropped, thus resolving the resource conflict while maintaining system performance
Solution Approach 2:
Instead of trying to transmit both overlapping transmissions simultaneously (conventional approach), the patent inverts the approach by selectively dropping one transmission based on priority. This inversion resolves the resource conflict by accepting that one transmission must be dropped, but ensures the most important UCI is transmitted, thereby maintaining reliability while managing system performance
2Productivity
If the wireless device drops a transmission to resolve resource overlap, then resource conflict is resolved, but uplink control information may be lost
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different UCI transmissions based on their local priority characteristics. Each UCI transmission is evaluated individually for its priority level, and the dropping decision is made locally for each transmission rather than applying a uniform rule, ensuring that only lower-priority information is dropped while higher-priority information is preserved
Solution Approach 2:
The system changes the transmission parameter (drop or transmit) based on the priority parameter. By introducing priority as a key parameter in the decision-making process, the system dynamically adjusts which transmission to drop, minimizing UCI loss while resolving resource conflicts efficiently
3Reliability
If dropping rules are implemented to prioritize UCI transmissions, then system performance is maintained, but device complexity increases due to additional decision-making logic
Solution Approach 1:
The patent applies segmentation by dividing the UCI transmission handling into distinct segments based on priority levels. The dropping rules are segmented into different cases (different priorities vs. same priorities), allowing the device to apply simplified logic for each segment rather than handling all cases uniformly, thus managing complexity while maintaining reliable priority-based transmission
Data Source
AI summary
A wireless device (12) determines that an uplink control channel resource (20B) for a multi-slot uplink control channel transmission (16B) overlaps in time with an uplink control channel resource (20A) for a single-slot uplink control channel transmission (16A) in a slot (18X). The wireless device (12) decides, for the slot (18X), either to drop whichever of the multi-slot uplink control channel transmission (16B) and the single-slot uplink control channel transmission (16A) carries uplink control information of a lower priority or to drop a certain one of the multi-slot uplink control channel transmission (16B) and the single-slot uplink control channel transmission (16A), depending on whether the multi-slot uplink control channel transmission (16B) and the single-slot uplink control channel transmission (16A) carry uplink control information of different priorities or the same priority, respectively. The wireless device (12) drops the single-slot uplink control channel transmission (16A) or the multi-slot uplink control channel transmission (16B) in the slot (18X), according to that decision.