Separate SRS Resources for Pathloss-Aware Multi-TRP Power Control
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Solution Overview
Problem
In the context of reciprocity-based joint downlink transmission from multiple Transmission and Reception Points (TRPs), the challenge lies in effectively performing SRS power control when significant pathloss differences exist between the UE and multiple TRPs, specifically determining which TRP and associated pathloss reference signal (PL-RS) to use for SRS power control.
Innovation Solution
The proposed solution involves configuring separate SRS resources or resource sets with distinct SRS sequences and power control parameters for different TRPs, allowing SRS transmission at different time instants and power levels to reduce interference across TRPs without increasing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single SRS resource with unified power control parameters is used for multiple TRPs, then device complexity is reduced, but SRS interference between TRPs increases due to significant pathloss differences
Solution Approach 1:
The patent divides the unified SRS resource into multiple separate SRS resources or resource sets, each associated with a specific TRP. Each segmented resource has its own power control parameters (pathloss reference signal, target power) tailored to the corresponding TRP's pathloss characteristics, thereby reducing interference while maintaining manageable complexity through structured segmentation
Solution Approach 2:
The patent applies local quality by configuring different power control parameters for different SRS resources based on their associated TRPs. Each SRS resource has localized power control settings (specific pathloss reference signal, specific target power) matched to the local propagation conditions of its target TRP, optimizing performance for each local scenario rather than using a single global configuration
2Object-generated harmful factors
If separate SRS resources with distinct power control parameters are configured for different TRPs, then SRS interference across TRPs is reduced, but device complexity and configuration overhead increase
Solution Approach 1:
The patent implements universality by designing SRS resources that can serve multiple functions: the same SRS resource configuration structure and transmission procedure can be applied to any number of TRPs, with the network simply configuring additional pathloss reference signals and power parameters. This multi-functional design allows the system to handle arbitrary numbers of TRPs without fundamentally changing the resource structure
Solution Approach 2:
The patent achieves equipotentiality by ensuring that all SRS resources, regardless of which TRP they target, follow the same configuration patterns and power control mechanisms. Each TRP-associated SRS resource is treated equally with its own set of power control parameters, creating a balanced framework where no single TRP configuration dominates or complicates the overall system
3Measurement precision
If SRS transmission power is increased to overcome pathloss to distant TRPs, then channel state information acquisition quality improves, but interference to other TRPs increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the SRS transmission power parameters (pathloss reference signal selection, target power level) based on which TRP is being targeted. The network configures different power control parameters for different SRS resources, allowing each resource to transmit at the appropriate power level for its specific TRP distance and pathloss characteristics, thereby achieving adequate measurement quality without excessive interference
Data Source
AI summary
Embodiments are disclosed for Sounding Reference Signal (SRS) uplink power control in case of multiple Transmission and Reception Points (TRPs). In one embodiment, a method in a User Equipment (UE) comprises receiving information that configures first and second SRS resource/resource sets with first and second SRS sequences and first and second sets of power control parameters, respectively, wherein the first and second SRS resources/resource sets are associated with a same set of UE antenna ports. The method further comprises transmitting, at a first instant(s), a first SRS using the first SRS resource/resource set with the first SRS sequence at a first uplink power level determined based on the first set of power control parameters and transmitting, at a second instant(s), a second SRS using the second SRS resource/resource set with the second SRS sequence at a second uplink power level determined based on the second set of power control parameters.