PUCCH Repetition Across Multiple Beams to Avoid Uplink Collisions
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring high reliability for uplink control information (UCI) transmissions, particularly in scenarios involving multiple transmission points, where PUCCH reliability is compromised due to collisions and varying channel conditions.
Innovation Solution
Implementing repeated PUCCH transmissions using multiple beams, with multiplexing schemes such as time, frequency, and spatial division, and dynamic signaling to manage beam configurations and collisions, ensuring robustness and reliability through enhanced PUCCH resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH transmissions are repeated using multiple beams, then reliability is improved, but device complexity increases
Solution Approach 1:
The PUCCH transmission is segmented into multiple repetitions, each using a different beam from a configured set of beams. The base station configures a codebook of beam pairs (spatial relation info) that the UE can select from, dividing the transmission task into manageable segments that can be handled independently while collectively improving reliability
Solution Approach 2:
The system dynamically selects which beams to use for PUCCH repetitions based on current channel conditions and collision scenarios. The UE can adaptively choose from configured spatial relation info based on downlink beam measurements, allowing dynamic optimization of beam selection without requiring complex real-time beam management
2Reliability
If multiple PUCCH resources are configured for repetition, then transmission robustness is improved, but resource management complexity increases
Solution Approach 1:
The base station pre-configures a codebook of spatial relation info and PUCCH resources before transmission occurs. This preliminary configuration provides the UE with a set of predefined beam and resource options, eliminating the need for complex real-time resource management while ensuring robust transmission through multiple pre-planned paths
Solution Approach 2:
The system changes key parameters (spatial relation info, PUCCH resources, beams) based on downlink beam measurements and collision detection. When collisions are detected or channel conditions change, the UE can switch to alternative parameters from the configured set, maintaining transmission robustness without requiring complex real-time parameter optimization
3Reliability
If PUCCH collisions are avoided through resource management, then reliability is improved, but signaling overhead increases
Solution Approach 1:
The UE autonomously detects PUCCH collisions by monitoring its own transmission schedule against configured resources and autonomously resolves them by selecting alternative resources from the configured codebook. This self-service approach avoids the need for extensive base station signaling to manage collisions, reducing overhead while maintaining reliability
Solution Approach 2:
The system uses downlink beam measurements as feedback to guide uplink PUCCH beam selection. The UE measures downlink reference signals and uses this feedback to select appropriate spatial relation info for uplink transmission, creating a closed-loop system that improves reliability without requiring additional uplink feedback signaling
Data Source
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AI summary
Embodiments are presented herein of apparatuses, systems, and methods for a user equipment device (UE) to perform PUCCH repetition based on signaling from at least one base station. The UE may connect to at least one base station. The UE may receive signaling from the at least one base station configuring physical uplink control channel (PUCCH) transmission. The signaling may indicate a plurality of PUCCH resources for PUCCH repetition. The signaling may indicate a plurality of beams for PUCCH repetition. Based on the signaling from the at least one base station, the UE may transmit the PUCCH a plurality of times using the plurality of PUCCH resources and the plurality of beams.