Uplink Power Control with TRP-Specific Pathloss Offsets
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining uplink power control, particularly in scenarios involving multiple transmit-receive points (TRPs) where pathloss measurements from one TRP are not accurate for transmissions to another TRP, necessitating enhancements for precise power control and separate closed-loop adjustments.
Innovation Solution
The method involves configuring a UE with pathloss offset values and PL estimates from Pathloss Reference Signals (PL RS) to determine and adjust transmit power for uplink channels or signals, using Transmission Configuration Indicator (TCI) states to facilitate accurate power control across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pathloss measurements from one TRP are used for transmissions to another TRP, then the system complexity is reduced, but the measurement precision deteriorates
Solution Approach 1:
The patent segments the pathloss measurement process by introducing separate pathloss reference signals for different TRPs. Instead of using a single pathloss measurement for all TRPs, the system divides the measurement into TRP-specific components, allowing accurate pathloss estimation for each transmit-receive point while maintaining manageable system complexity through structured segmentation.
Solution Approach 2:
The patent applies local quality by configuring different pathloss offset values for different TCI states associated with different TRPs. Each TRP receives tailored pathloss measurements and offset configurations suited to its specific characteristics, rather than applying a uniform pathloss value across all TRPs, thereby improving measurement precision for each local TRP scenario.
2Measurement precision
If separate closed-loop adjustments are implemented for each TRP, then the uplink power control precision is improved, but the device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms through separate closed-loop adjustments for each TRP. The network receives uplink transmissions from the UE and provides feedback via TPC commands in downlink transmissions, allowing independent optimization of power control for each TRP. This feedback loop enables precise power control adjustments while managing complexity through standardized feedback procedures.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting pathloss offset values and TCI state configurations for different TRPs. The network can modify these parameters based on channel conditions, UE location, and TRP characteristics, enabling flexible and precise power control without requiring completely separate control mechanisms for each TRP.
Data Source
AI summary
Methods, systems, and apparatuses are provided for uplink power control in a wireless communication system, wherein a method of a User Equipment (UE) comprises receiving one or more Transmission Configuration Indicator (TCI) state configurations associated with one or more Bandwidth Parts (BWPs) in a serving cell, receiving a first indication to associate a first plurality of Uplink (UL) channels or signals with the first UL TCI state, determining a first Transmit (TX) power for a first UL channel or signal among the first plurality of UL channels or signals based on at least the first Pathloss (PL) offset value and a first PL estimate determined from a first Pathloss Reference Signal (PL RS) associated with the first UL TCI state, performing a first transmission of the first UL channel or signal based on the determined first TX power, receiving a PL offset signal, determining, in response to the PL offset signal, a second TX power for the first UL channel or signal among the first plurality of UL channels or signals based on at least the second PL offset value and a second PL estimate determined from the first PL RS associated with the first UL TCI state, and performing a second transmission of the first UL channel or signal based on the determined second TX power.