Transmit Power Determination Using UE Geometry Factors
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Solution Overview
Problem
Current power control mechanisms in wireless communication networks, such as closed and open loop power control, do not accurately determine transmit power levels, leading to inefficiencies and potential signal degradation due to lack of consideration for geometry factors influencing signal path loss and interference.
Innovation Solution
A method and device that determine transmit power for physical channels by obtaining geometry factors of User Equipments (UEs), creating statistical measures based on these factors, and using these measures in power control expressions to set optimal transmission power levels, incorporating geometric information to improve power control accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional power control mechanisms (closed-loop or open-loop) are used to determine transmit power, then the power control process is simple to implement, but the accuracy of transmit power determination is insufficient due to lack of consideration for geometry factors
Solution Approach 1:
The network node pre-calculates geometry factors based on UE positions and network configuration before power control execution. These pre-computed geometry factors are stored and readily available when needed for transmit power determination, eliminating the need for complex real-time calculations during the power control process itself.
Solution Approach 2:
A geometry factor is introduced as an intermediary parameter that bridges the gap between simple power control mechanisms and accurate transmit power determination. The geometry factor encapsulates complex geometric relationships and is used as a input to the power control expression, simplifying the overall process while improving accuracy.
2Reliability
If UE always uses maximum transmit power to ensure signal decodability, then signal decoding reliability is improved, but power consumption increases unnecessarily affecting UE performance
Solution Approach 1:
The transmit power parameter is dynamically adjusted based on the calculated geometry factor and power control expression. Instead of using fixed maximum power, the system computes an optimal power level that adapts to the specific geometric conditions, ensuring sufficient power for reliable decoding while minimizing unnecessary power consumption.
Solution Approach 2:
The system uses uplink geometry factors calculated from downlink measurements and incorporates them into the power control expression. This feedback mechanism allows the UE to determine appropriate transmit power levels based on actual geometric conditions, avoiding both power deficiency and excessive power consumption.
3Measurement precision
If power control expressions incorporate complex parametrical expressions to account for dynamical phenomena, then transmit power accuracy is improved, but the complexity of the power control mechanism increases
Solution Approach 1:
The power control mechanism is segmented into distinct components: geometry factor calculation (performed by network node), power control expression evaluation (performed by UE), and transmit power determination. This segmentation allows complex geometric considerations to be handled separately from the power control logic, simplifying the overall system while maintaining accuracy.
Solution Approach 2:
The geometry factor serves as an intermediary that encapsulates complex geometric and dynamic phenomena. By pre-calculating and incorporating this factor into the power control expression, the system accounts for dynamical effects without requiring the UE to implement complex calculation mechanisms.
Data Source
AI summary
There is provided a method performed by a network node for determining the transmit power to be used on a physical channel. The method comprises the step of obtaining values for the geometry factors G of a set of User Equipments, UEs. The method also comprises the step of creating, based on the obtained geometry factors and representations of the statistical moments of the geometry factors, a statistical measure G* for the set of UEs. The method also comprises the step of determining a value representing the transmission power for physical channel transmissions based on a power control expression for physical channel transmissions comprising the statistical measure G* for the set of UEs, and setting the transmission power to the determined value. A corresponding network node and a corresponding computer program is also provided.