Uplink DMRS Bundling Phase Coherency Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in maintaining phase coherency for demodulation reference signals during uplink channel repetitions, which affects channel estimation and communication reliability, especially when UE capabilities are limited in handling non-contiguous repetitions.
Innovation Solution
The proposed solution involves a user equipment (UE) determining and maintaining separate phase coherency configurations for different sets of uplink channel repetitions, using control messages to schedule and configure demodulation reference signals, allowing for phase coherency maintenance across contiguous repetitions and adaptive transmission parameters, such as beams and frequencies, to support efficient channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase coherency is maintained across all uplink channel repetitions, then channel estimation accuracy is improved, but UE complexity increases when handling non-contiguous repetitions
Solution Approach 1:
The patent segments the uplink channel repetitions into multiple groups, where phase coherency is maintained within each group but not necessarily across all repetitions. This allows the UE to manage phase coherency on a per-group basis, reducing overall complexity while maintaining estimation accuracy within each segment.
Solution Approach 2:
The patent applies different phase coherency requirements to different groups of repetitions based on local conditions. Each group can have its own phase coherency configuration, allowing the system to optimize for channel estimation accuracy where needed while reducing UE complexity in other areas.
2Adaptability or versatility
If separate phase coherency configurations are used for different repetition sets, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic phase coherency configuration where the UE can adaptively select and apply different phase coherency settings for different repetition groups based on channel conditions and UE capabilities. This dynamic approach improves adaptability while managing complexity through structured configuration options.
3Device complexity
If phase coherency is maintained for contiguous repetitions only, then UE complexity is reduced, but channel estimation reliability deteriorates for non-contiguous repetitions
Solution Approach 1:
By segmenting repetitions into groups and maintaining phase coherency within each group, the patent ensures reliable channel estimation for contiguous repetitions while providing a framework that can extend to non-contiguous groups, thus improving overall reliability without excessive complexity.
Solution Approach 2:
The patent introduces phase coherency configuration as an intermediary mechanism that mediates between the requirements for reliable channel estimation and UE complexity. This configuration layer allows the system to achieve reliability for contiguous repetitions while managing complexity through structured phase coherency management.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE), that is configured for demodulation reference signal (DMRS) bundling, may receive a control message that schedules first and second sets of repetitions of an uplink transmission. The UE may determine a phase coherency configuration to be applied for DMRS transmissions corresponding to each set of repetitions. The phase coherency configuration may be determined based on a phase coherency capability of the UE, and the phase coherency configuration may specify that phase coherency is to be maintained for one or more of the first set of repetitions separate from one or more of the second set of repetitions. The UE may transmit the first set of repetitions with a first set of demodulation reference signals and the second set of repetitions with a second set of demodulation reference signals in accordance with the phase coherency configuration.