Path Loss Reference Signal Timing for Adaptive Uplink Power Control
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently utilizing path loss reference signals (PL RS) for uplink power control, particularly in dynamic environments where mobility and varying signal strengths affect the accuracy and timeliness of power control adjustments.
Innovation Solution
The method involves a user equipment (UE) receiving an indication to activate a PL RS, transmitting an acknowledgement, and then measuring samples of the PL RS. The number of samples measured before utilizing them for uplink power control varies based on factors such as previous measurements, variance in signal strength, and mobility status, allowing for dynamic adjustment of the PL RS application time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE measures a fixed number of PL RS samples before utilizing them for uplink power control, then the power control process is simple and fast, but the accuracy of power control deteriorates in dynamic environments with mobility and varying signal strengths
Solution Approach 1:
The patent implements dynamic determination of the number of PL RS samples to measure based on channel conditions. The UE assesses factors such as mobility status, signal strength variance, and previous measurement quality to adaptively select the sample count. This dynamic approach allows the system to increase measurement accuracy when channel conditions are poor or changing rapidly, while maintaining simplicity when conditions are stable, thereby resolving the contradiction between measurement precision and device complexity.
2Measurement precision
If the UE waits to measure multiple samples of PL RS before applying them to uplink power control, then the accuracy of power control improves, but the response time and speed of power adjustments deteriorates
Solution Approach 1:
The patent dynamically adjusts the number of PL RS samples measured based on channel conditions. When channel conditions are stable and favorable, the UE can apply power control after measuring fewer samples, enabling faster response. When conditions are poor or rapidly changing, the UE measures more samples to ensure accuracy before application. This dynamic balancing act resolves the contradiction between measurement precision and speed of adjustments.
Solution Approach 2:
The patent changes the parameter of sample measurement duration based on assessed channel conditions. By evaluating factors such as mobility status and signal strength variance, the UE adjusts the number of samples to measure, thereby changing the time required before power control application. This parameter change allows the system to optimize the trade-off between accuracy and speed according to actual operating conditions.
3Adaptability or versatility
If the UE uses a fixed time window for previous PL RS measurements, then the implementation is simple, but the adaptability to different channel conditions and mobility scenarios deteriorates
Solution Approach 1:
The patent implements dynamic evaluation of channel conditions to determine the appropriate time window for previous PL RS measurements. The UE assesses factors such as mobility status, signal strength variance, and previous measurement quality to adaptively select the evaluation window size. This dynamic approach allows the system to expand the evaluation window when conditions are poor to gather more historical data, while using a smaller window when conditions are favorable, thereby resolving the contradiction between adaptability and device complexity.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for determining application time for a path loss reference signal (PL RS) by a user equipment (UE). A method that may be performed by a UE includes receiving an indication of activation of a PL RS. The method further includes transmitting an acknowledgement for the indication. The method further includes measuring samples of the PL RS for a number of samples after transmitting the acknowledgement prior to utilizing the measured samples of the PL RS for uplink power control. The method further includes utilizing the measured samples of the PL RS for uplink power control after measuring at least the number of samples of the PL RS. The number of samples varies based on one or more factors.