Path Loss Reference Signal Timing for Adaptive Uplink Power Control
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Solution Overview
Problem
Existing wireless communication systems, particularly in NR and LTE, face challenges in efficiently utilizing path loss reference signals (PL RS) for uplink power control, leading to delays in performing actions that improve communication quality and throughput.
Innovation Solution
The method involves activating a PL RS and allowing a UE to measure samples for a dynamically determined application time based on factors such as previous measurements, signal strength variance, and mobility status, thereby reducing delays in utilizing the PL RS for uplink power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE measures a fixed number of PL RS samples before utilization, then the measurement process is simple and standardized, but the uplink power control responds slowly to changing channel conditions
Solution Approach 1:
The patent implements dynamic adjustment of the PL RS application time based on mobility status. When the UE is in a high-mobility state, the application time is reduced to allow faster response to changing channel conditions. When in a low-mobility state, the application time can be extended for more accurate measurements. This dynamic parameter adjustment resolves the contradiction by adapting the measurement duration to actual channel conditions rather than using a fixed value.
Solution Approach 2:
The patent changes the parameter of application time based on mobility status and signal strength variance. By monitoring these conditions and adjusting the number of samples or time duration accordingly, the system optimizes the balance between response speed and measurement accuracy. This parameter change approach allows the system to respond quickly when needed while maintaining measurement reliability.
2Speed
If the UE reduces the number of PL RS samples measured, then the uplink power control responds faster to channel changes, but the measurement accuracy decreases
Solution Approach 1:
The patent dynamically adjusts the application time parameter based on mobility status and signal strength variance. When mobility is low and signal variance is small, fewer samples are needed for accurate measurement, enabling faster response. When mobility is high or variance is large, more samples are taken to maintain measurement accuracy. This adaptive parameter adjustment resolves the contradiction between speed and precision.
Solution Approach 2:
The system uses feedback from mobility status indicators and signal strength variance measurements to dynamically adjust the number of PL RS samples to be measured. This feedback mechanism ensures that the measurement process adapts to current channel conditions, taking fewer samples when conditions are stable (maintaining speed) and more samples when conditions are changing (maintaining precision).
3Reliability
If the UE uses outdated PL RS measurements for uplink power control, then the system operates with simpler timing requirements, but the communication quality and throughput decrease
Solution Approach 1:
The patent implements dynamic adjustment of the application time based on mobility status. In high-mobility scenarios, the system reduces the time delay by applying measurements more quickly, ensuring that uplink power control reflects current channel conditions. In low-mobility scenarios, the system can afford longer measurement periods. This dynamic timing adjustment ensures communication quality is maintained without unnecessary delays.
Solution Approach 2:
The system performs preliminary assessment of mobility status and signal conditions to determine the appropriate application time before actually utilizing the PL RS measurements. This preliminary action allows the system to prepare the optimal measurement duration in advance, ensuring that measurements are both current and sufficient for accurate power control, thereby maintaining communication quality while minimizing delays.
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.