Reference Signal Phase Drift Reporting for Coherent NR Bundling
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Solution Overview
Problem
Existing wireless communications systems, particularly in New Radio (NR), face challenges in maintaining reference signal time-domain coherency due to phase time drift, which affects the ability to bundle and combine reference signals effectively.
Innovation Solution
User Equipment (UE) reports a time-domain model and parameters indicating how the phase of its ports varies across time, allowing a receiving device to bundle reference signals coherently by transmitting an indication of these parameters, which are valid under specific conditions such as consistent port usage and power thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If reference signals are transmitted across different time periods, then communication coverage and signal aggregation are improved, but phase time drift causes loss of time-domain coherency
Solution Approach 1:
The UE performs preliminary measurement and characterization of its own phase time drift behavior, then reports this information to the network. This allows the network to pre-configure appropriate bundling parameters and coherence conditions before actual reference signal transmission occurs, ensuring coherent bundling is maintained across extended time periods.
Solution Approach 2:
The patent introduces and reports multiple transmission parameters including time-domain model parameters, phase drift characteristics, and coherence conditions. By changing and reporting these parameters, the system enables adaptive reference signal bundling that maintains coherence across varying time conditions while expanding coverage area.
2Measurement precision
If multiple reference signals are bundled across time, then signal aggregation and measurement accuracy are improved, but phase variations prevent coherent bundling
Solution Approach 1:
The UE provides feedback to the network about its phase time drift characteristics through reporting transmission parameters. This feedback enables the network to adjust bundling configurations and coherence conditions, allowing precise measurement through coherent bundling even when phase variations occur over extended periods.
Solution Approach 2:
The system dynamically adapts bundling configurations based on reported phase drift characteristics. By making the bundling parameters dynamic rather than fixed, the system can maintain measurement precision across varying phase conditions while aggregating multiple reference signals over time.
3Manufacturing precision
If transmission parameters are reported with high precision, then reference signal bundling accuracy is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
Instead of reporting complete transmission parameters for all possible conditions, the UE reports parameters locally relevant to its specific time drift characteristics and operational state. This selective reporting approach maintains high bundling accuracy for the actual transmission conditions while reducing overall signaling overhead and processing complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may report a time-domain model and parameters to indicate how one or more characteristics, such as a phase, of ports used to transmit reference signals can change across time. For example, the UE may determine one or more sets of transmission parameters associated with a reference signal type, where the one or more sets of transmission parameters can enable a receiving device to bundle reference signals of the reference signal type. The UE may transit an indication of these one or more sets of transmission parameters to the receiving device, where the indication can be associated with how a characteristic of the ports of the UE varies across time. Based on the indication of one or more sets of transmission parameters, the receiving device may receive reference signals and bundle (e.g., combine) the reference signals.