UE Transmit Power Control for Non-Serving Cell Positioning
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Solution Overview
Problem
Conventional wireless communication systems face challenges in accurately determining the transmit power for reference signals during positioning procedures, especially when transmitting to non-serving cells, which can result in insufficient signal reception and inaccurate positioning.
Innovation Solution
The system determines the transmit power for reference signals by assessing the absence of specific parameters, such as target received power or path loss estimates, and uses alternative methods, like maximum transmit power or messages from non-serving cells, to ensure adequate power levels for accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE transmits reference signal to non-serving cells using conventional power control methods, then the positioning procedure can be performed, but the signal reception at non-serving cells is insufficient resulting in inaccurate positioning
Solution Approach 1:
The patent changes the transmit power parameter dynamically based on the target cell type. When transmitting to non-serving cells, the UE applies a power offset parameter (e.g., powerOffsetForPositioning) to increase the transmit power above the conventional level, ensuring sufficient signal reception at distant non-serving cells for accurate positioning measurements
Solution Approach 2:
The patent introduces an intermediary parameter (powerOffsetForPositioning or P_O_OFFSET) that mediates between the conventional power control mechanism and the enhanced power requirement for non-serving cells. This offset parameter is configured by the network and applied by the UE to adjust the transmit power specifically for positioning reference signals to non-serving cells
2Reliability
If the UE increases transmit power for reference signals to non-serving cells, then signal reception improves, but energy consumption increases
Solution Approach 1:
The patent applies local quality by differentiating power control treatment between different target cells. Instead of uniformly increasing power for all transmissions, the UE applies enhanced power only when transmitting to non-serving cells for positioning, while maintaining conventional power control for serving cells and other transmissions, thus minimizing unnecessary energy consumption
Solution Approach 2:
The patent implements dynamic power control where the transmit power is adjusted based on real-time conditions including the target cell type (serving vs. non-serving), path loss measurements, and configured power offsets. This dynamic adjustment ensures sufficient power is used only when and where needed for positioning to non-serving cells
3Measurement precision
If the UE determines transmit power based on multiple parameters from serving cell and non-serving cell messages, then positioning accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure the powerOffsetForPositioning parameter through RRC signaling before the positioning procedure. The UE receives and stores this configuration in advance, so during the actual positioning transmission, the UE can directly apply the pre-configured offset without complex real-time calculations, reducing processing complexity while maintaining accuracy
Data Source
AI summary
Methods, systems, and devices for transmit power control for positioning using non-serving cells are described. A user equipment (UE) may determine that an uplink reference signal may be associated with a positioning procedure. In some cases, the positioning procedure may include transmission, by the UE, of the reference signal to a non-serving cell, which may be farther away from the UE than a serving cell. The UE may determine an absence of a parameter associated with a transmit power for transmitting the reference signal. Based on the absence, the UE may determine the transmit power based on parameters received from a serving cell, based on configuration information, based on a message intercepted from the cell other than the serving cell, or based on other considerations or information.