Uplink Pathloss Reference Signaling for Multi-TRP Power Control
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Solution Overview
Problem
In multi-transmission reception point (M-TRP) scenarios, there is a lack of technical solutions for determining uplink pathlosses to different transmission reception points, which is necessary for effective uplink power control during TRP switching.
Innovation Solution
A method and apparatus for determining uplink pathloss by a user equipment (UE) involving the reception of first information from a network device, such as DCI or MAC CE, to identify pathloss reference signals (PL RS) through correlation relationships, and calculating pathloss using these signals, with optional processing rules for multiple signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TRP switching occurs in M-TRP scenario, then uplink power control needs to be achieved, but there is currently no technical solution for determining uplink pathloss
Solution Approach 1:
The patent introduces a pathloss reference signal (PL RS) as an intermediary element to enable pathloss determination. The PL RS is a downlink reference signal specifically designed to facilitate uplink power control, acting as a mediator between the downlink TRP transmission and uplink power adjustment. The UE determines the PL RS based on first information (DCI or MAC CE) and calculates uplink pathloss using this reference signal, thereby solving the pathloss determination problem without requiring complex direct measurement mechanisms.
2Adaptability or versatility
If multiple PL RSs are determined, then pathloss calculation can be performed for multiple TRPs, but complexity increases in selecting which PL RS to use
Solution Approach 1:
The patent implements dynamic PL RS selection through processing rules that can be configured by the network. When multiple PL RSs are determined, the UE applies processing rules (such as selecting minimum pathloss, maximum pathloss, or weighted sum) to determine which PL RS to use for uplink power control. This dynamic selection mechanism allows the system to adapt to different M-TRP scenarios and TRP switching conditions while maintaining manageable complexity through network-configurable rules.
Data Source
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AI summary
Provided in the present disclosure are a pathloss determination method and apparatus, relating to the technical field of communications. The method comprises: a terminal device receiving first information sent by a network device; according to the first information, determining a pathloss reference signal; and calculating, on the basis of the pathloss reference signal, an uplink pathloss. The present disclosure provides a technical scheme for determining the uplink pathloss of the terminal device. By means of applying the technical scheme of the present embodiment, the pathloss can be calculated for a target TRP, thereby achieving uplink power control.