PUCCH Cell Switching With Controlled Repetition
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Solution Overview
Problem
The increasing number of UEs and data volume in wireless communication systems necessitates efficient use of limited radio resources for PUCCH transmission and reception, particularly in high-density node environments, while addressing varying service requirements and latency issues.
Innovation Solution
Implementing PUCCH cell switching patterns that allow for PUCCH transmission and reception based on configured resources, with specific rules for applying or omitting repetitions during cell switching, optimizing resource utilization and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PUCCH cell switching is applied to increase resource utilization, then radio resource efficiency is improved, but transmission complexity and latency increase due to repeated switching operations
Solution Approach 1:
The patent extracts the PUCCH repetition function from the cell switching mechanism by introducing a separate configuration parameter (pucch-Repetition) that independently controls repetition behavior. This allows the system to apply cell switching for resource efficiency while managing repetition separately to reduce unnecessary switching complexity.
Solution Approach 2:
The patent implements dynamic control of PUCCH repetition through higher-layer signaling that can enable or disable repetition based on service requirements. This dynamic configuration allows the system to adapt between resource efficiency mode (with repetition) and low-complexity mode (without repetition) depending on traffic conditions.
2Reliability
If PUCCH repetition is configured to improve reliability, then transmission reliability is improved, but latency increases due to multiple transmission cycles
Solution Approach 1:
The patent changes the repetition parameter (pucch-Repetition) from a fixed value to a dynamically configurable parameter that can be adjusted based on service type. For latency-sensitive services like URLLC, the parameter is set to 0 or 1 to minimize repetition. For reliability-critical services, higher repetition values are applied, thus optimizing the trade-off between reliability and latency.
Solution Approach 2:
The patent applies different repetition configurations to different PUCCH resources or service types locally. Instead of uniform repetition across all transmissions, the system can apply repetition only where needed (e.g., for specific UEs, specific service types, or specific time periods), thereby improving reliability where necessary while minimizing latency impact elsewhere.
3Productivity
If cell switching pattern is applied frequently to optimize resource allocation, then resource allocation efficiency is improved, but processing overhead and latency increase
Solution Approach 1:
The patent configures cell switching patterns and repetition parameters in advance through higher-layer signaling before actual PUCCH transmission begins. This preliminary configuration allows the UE to prepare transmission parameters ahead of time, reducing processing overhead during actual transmission and minimizing latency while maintaining efficient resource allocation.
Data Source
AI summary
A UE may: receive a configuration related to a PUCCH cell change, wherein the configuration includes information related to a PUCCH cell change pattern of a cell among a first cell and a second cell, the cell indicating a PUCCH cell in a time domain; determine to perform PUCCH transmission on the basis of a PUCCH resource for which repetition is configured on the first cell; and not apply the PUCCH cell change to repetitions of the PUCCH transmission in a state in which the PUCCH cell is changed from the first cell to the second cell according to the PUCCH cell change pattern.