Per-TRP Uplink Power Control for SFN Transmission Efficiency
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Solution Overview
Problem
Current wireless communication systems lack per-transmission and reception point (TRP) power control for uplink transmissions in single frequency network (SFN) configurations, which can lead to inefficiencies in signal transmission.
Innovation Solution
A UE determines respective uplink transmission power levels for each TRP in an SFN configuration, receives DCI messages with transmit power commands, and transmits power headroom reports to manage power levels based on TCI states and power control parameters, enabling per-TRP power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If per-TRP power control is implemented for uplink SFN transmissions, then transmission efficiency and signal accuracy are improved, but device complexity and control mechanism complexity increase
Solution Approach 1:
The patent segments the power control mechanism by introducing separate power control parameters (first set for first TRP, second set for second TRP) and separate power control commands within the DCI message for each TRP. This allows independent power adjustment for each transmission point, enabling optimized power control for different TRPs while maintaining manageable complexity through structured parameter organization.
Solution Approach 2:
The patent implements dynamic power control by allowing the UE to determine power levels based on real-time conditions including received power headroom reports, path loss measurements, and network feedback. The power control parameters can be adjusted dynamically based on channel conditions and transmission requirements, enabling adaptive optimization without requiring complex static configurations.
2Measurement precision
If multiple power control parameters are configured for each TRP, then power control precision is improved, but measurement and detection difficulty increases
Solution Approach 1:
The patent uses TCI states as an intermediary mechanism to associate power control parameters with TRPs. The TCI state contains identification information that serves as a mediator between the power control parameters and the corresponding TRP, making it easier for the UE to correctly associate and interpret the parameters without complex measurement and detection procedures.
Solution Approach 2:
The patent implements a feedback mechanism where the UE reports power headroom information for each TRP, and the network uses this feedback to adjust power control parameters. This feedback loop enables precise power control while simplifying the association process, as the network can directly map feedback reports to the corresponding TRPs based on the established TCI state associations.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described, the described techniques provide for per-transmission and reception point (TRP) power control for uplink transmissions using a single frequency network (SFN) configuration. A UE that establishes communications with a network via two or more TRPs using an SFN configuration for uplink transmissions may determine respective uplink transmission power levels for uplink transmissions to each TRP. The UE may transmit uplink transmissions to the two or more TRPs in accordance with the determined respective uplink transmission power levels. In some cases, the UE may receive a downlink control information message that includes transmit power command fields for each respective TRP based on transmission configuration indictor states associated with each TRP. In some cases, the UE may determine a set of power control parameters associated with each TRP. In some cases, the UE may transmit power headroom reports for each TRP.