PUCCH Carrier Switching Processing Time Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current PUCCH carrier switching in wireless communications leads to frequent bottlenecks and increased complexity due to differing processing times for PDSCH on different cells, resulting in UE implementation challenges and unnecessary scheduling restrictions.
Innovation Solution
The method considers the numerologies of both uplink carriers configured for PUCCH transmission to determine the minimum processing time for PDSCH, aligning processing times across carriers and reducing complexity by using the smallest or largest subcarrier spacing, or a reference numerology, to ensure consistent PUCCH transmission timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PUCCH carrier switching is implemented with different numerologies on different cells, then carrier aggregation flexibility and uplink control channel transmission options are improved, but processing time bottlenecks and UE implementation complexity increase
Solution Approach 1:
The patent changes the parameter used for processing time determination from cell-specific numerology to a unified reference numerology (e.g., μ=0 or μ=1) that is consistent across all cells. This parameter change resolves the contradiction by maintaining carrier aggregation flexibility while eliminating the processing time bottlenecks that arise from having different numerologies on different cells, thereby reducing UE implementation complexity.
2Speed
If cell-specific numerology is used for PDSCH processing time determination, then each cell can operate at its optimal processing speed, but processing time bottlenecks occur when switching between cells with different numerologies
Solution Approach 1:
The patent applies equipotentiality by establishing a unified reference numerology across all cells, creating an equal processing time baseline. This ensures that PDSCH processing time is determined consistently regardless of which cell is used for PUCCH transmission, eliminating processing time bottlenecks when switching between cells while maintaining optimal operation through proper scheduling.
3Adaptability or versatility
If different numerologies are configured on different cells for PUCCH transmission, then scheduling flexibility is improved, but unnecessary scheduling restrictions are imposed due to processing time constraints
Solution Approach 1:
The patent changes the reference numerology parameter from cell-specific to network-configured and consistent across all cells. This parameter change removes unnecessary scheduling restrictions that arise from processing time constraints, allowing the network to schedule PDSCH and PUCCH transmissions more efficiently while maintaining the flexibility to use different numerologies on different cells for other purposes.
Data Source
AI summary
According to some embodiments, a method is performed by a wireless device operable to receive scheduling and data transmission from one or more downlink cells and perform uplink transmission with two or more uplink cells. The method comprises receiving scheduling for a downlink transmission in one of the downlink cells and scheduling for an uplink transmission in one of the uplink cells to provide feedback for the downlink transmission and determining whether the uplink transmission is scheduled at least a minimum processing time after the scheduled downlink transmission. The minimum processing time is based on a numerology of the downlink cells and the uplink cells. The method further comprises, upon determining that the uplink transmission is not scheduled at least a minimum processing time after the scheduled downlink transmission, transmitting an indication to at least one cell of the one or more downlink cells.