Multi-TRP Path-Loss Determination Using Offsets for UE Power Control
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Solution Overview
Problem
In multi-TRP operations, UEs face challenges in determining path-loss for secondary network nodes without directly measuring downlink path-loss reference signals, which is essential for effective uplink power control.
Innovation Solution
A method for a UE to estimate path-loss for secondary network nodes by receiving a list of path-loss offsets and using reference signal indices, enabling path-loss determination and uplink power control without direct measurement of downlink signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct measurement of downlink path-loss reference signals is used for path-loss determination, then measurement precision is improved, but device complexity and operation difficulty increase for multi-TRP scenarios
Solution Approach 1:
The patent introduces path-loss offsets as intermediary values that mediate between the reference signal measurements and the final path-loss determination for secondary TRPs. Instead of requiring direct measurement between UE and secondary TRP, the base station acts as an intermediary by calculating and providing offset values that adjust the primary TRP's path-loss to reflect secondary TRP conditions.
Solution Approach 2:
The base station performs preliminary calculations of path-loss offsets based on configured reference signals and provides these values to the UE in advance through RRC configuration. This preliminary action eliminates the need for the UE to perform complex real-time measurements and calculations for multiple TRPs during uplink transmission.
2Measurement precision
If multiple path-loss measurements are performed for multi-TRP operation, then path-loss determination accuracy is improved, but loss of time increases due to additional measurement and calculation steps
Solution Approach 1:
The base station pre-calculates path-loss offsets using configured reference signals and provides them to the UE through RRC configuration before uplink transmission. This eliminates the need for time-consuming real-time measurements and calculations at the UE for multiple TRPs.
Solution Approach 2:
The patent provides the UE with a list of pre-configured path-loss offsets that cushion against the complexity and time requirements of multiple path-loss measurements. These pre-prepared offset values allow the UE to quickly determine appropriate path-loss for secondary TRPs without performing additional measurements.
3Ease of operation
If path-loss offsets are configured and provided to UE, then ease of operation is improved, but loss of information may occur if offset selection and application is not properly managed
Solution Approach 1:
The patent implements feedback mechanisms where the base station provides path-loss offsets and the UE applies them to determine uplink power control parameters. The base station can adjust and reconfigure offsets based on UE feedback and channel conditions, ensuring accurate path-loss determination while maintaining ease of operation.
Solution Approach 2:
The UE autonomously selects and applies the appropriate path-loss offset from the configured list based on the active uplink bandwidth part and transmission conditions. This self-service capability simplifies operation while maintaining accuracy through proper offset selection.
Data Source
AI summary
Methods and apparatuses for path-loss determination for multi-transmit-receive point (TRP) operation. A method performed by a user equipment (UE) includes receiving a first list of one or more path-loss offsets (PLOs) in a radio resource control (RRC) configuration, receiving first information related to a first path-loss (PL), and receiving second information related to a PLO. The method further includes determining the first PL based on the first information; determining the PLO based on the first list and the second information, determining a second PL based on the first PL and the determined PLO; and determining an uplink (UL) power control parameter based on the first PL or the second PL. The first information includes at least a PL reference signal (RS) index.