TRP-Linked Uplink Power Control via TCI State Mapping
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Solution Overview
Problem
Existing wireless communication systems lack efficient methods for setting default power parameters per transmission and reception point, leading to suboptimal power control in multi-TRP operations.
Innovation Solution
A user equipment (UE) receives control messages indicating a set of code points and transmission configuration indication states, along with linked power control parameters, to transmit uplink communications using default power control settings associated with specific TRPs, even in the absence of explicit parameter provisioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If default power parameters are not explicitly provisioned for each TRP, then device complexity and signaling overhead are reduced, but power control precision and communication reliability deteriorate
Solution Approach 1:
The patent pre-establishes a mapping relationship between TCI states and power control parameter sets before actual transmission. When the network configures multiple TCI states for a TRP, each TCI state is pre-associated with a specific power control parameter set (P0, alpha, pathlossReferenceSignal). This preliminary configuration ensures that when uplink transmission occurs, the UE can immediately select the appropriate power parameters based on the activated TCI state without requiring real-time parameter provisioning, thus maintaining both low complexity and high reliability
Solution Approach 2:
The patent introduces TCI state as an intermediary element that bridges the gap between TRP configuration and power control parameter selection. The TCI state acts as a mediator that carries implicit information about which power control parameter set should be used. By configuring power control parameters through the TCI state intermediary rather than direct TRP-parameter mapping, the system reduces signaling overhead while maintaining the ability to provide TRP-specific power control
2Measurement precision
If multiple power control parameter sets are configured for different TRPs, then power control precision is improved, but device complexity and configuration overhead increase
Solution Approach 1:
The patent makes the TCI state multi-functional by having it serve both as a beam/spatial configuration indicator and as a power control parameter selector. The same TCI state that identifies the spatial filter and reference signal for reception also implicitly indicates which power control parameter set (P0, alpha, pathlossReferenceSignal) should be used for uplink transmission. This universal use of TCI state eliminates the need for separate parameter configuration for each TRP, reducing device complexity while maintaining power control precision
Solution Approach 2:
The patent segments the power control configuration into multiple independent parameter sets, each associated with a specific TCI state. Instead of having a single monolithic power control configuration, the system divides power parameters (P0, alpha, pathlossReferenceSignal) into separate sets that can be independently configured and selected. This segmentation allows precise power control for each TRP while keeping the configuration modular and manageable, reducing overall system complexity
3Reliability
If TRP-specific power parameters are explicitly signaled, then communication reliability is improved, but signaling overhead and processing time increase
Solution Approach 1:
The patent uses the downlink TCI state configuration as a template or copy for uplink power control parameter configuration. The same TCI state indices and structures used for downlink beam management are copied and reused for uplink power control. This copying approach ensures that the uplink power parameters are already configured and ready before transmission is needed, eliminating real-time parameter processing while maintaining TRP-specific power control reliability through the pre-established TCI-state to power-parameter mapping
Data Source
AI summary
Methods, systems, and devices for wireless communications at a user equipment (UE) are described. The UE may receive a first control message indicating a plurality of code points and a plurality of transmission configuration indication states. The UE may receive a second control message including a grant scheduling transmission of an uplink communication to a first transmission and reception point and an indication of a code point from the plurality of code points, the code point indicating a first transmission configuration indication state of the plurality of transmission configuration indication states for communication with the first transmission and reception point. The UE may transmit the uplink communication to the first transmission and reception point using the first transmission configuration indication state in accordance with a first set of power control parameters and the first set of power control parameters may be linked to the first transmission and reception point.