Uplink Power Control via Multiple Pathloss Derivation for Beamforming
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and emerging 5G networks, the derivation of uplink transmit power is challenging due to the increased path loss at higher frequencies, which affects the coverage and reliability of beamforming operations, leading to inefficient use of antenna arrays and limited concurrent high-gain beams.
Innovation Solution
The method involves User Equipment (UE) deriving multiple pathloss values from different reference signals to determine optimal uplink transmission power, allowing for dynamic adjustment based on the quality of individual beams, thereby improving coverage and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pathloss value is used for uplink power control, then the device complexity is reduced, but the reliability of beamforming operations deteriorates due to increased path loss at higher frequencies
Solution Approach 1:
The patent divides the single pathloss value into multiple pathloss values, each corresponding to a different reference signal (e.g., SSB and CSI-RS). This segmentation allows the UE to derive separate pathloss measurements for different beams, improving the reliability of beamforming operations by accounting for frequency-specific path loss variations while maintaining manageable complexity through standardized measurement procedures.
2Reliability
If multiple pathloss values are derived from different reference signals, then the beamforming reliability is improved, but the device complexity increases
Solution Approach 1:
The patent changes the parameter of pathloss measurement by introducing multiple reference signals (SSB and CSI-RS) with different frequency configurations. This allows the system to adapt pathloss derivation to specific frequency bands and beam characteristics, improving beamforming reliability while the complexity is managed through parameter-based differentiation rather than structural complexity.
3Area of stationary object
If uplink transmit power is increased to compensate for path loss, then the coverage area is improved, but the interference to other transmissions increases
Solution Approach 1:
The patent applies local quality by deriving separate pathloss values for different reference signals and beams, allowing uplink power control to be optimized locally for each beam direction and frequency resource. This enables the system to provide adequate coverage in specific directions while minimizing unnecessary power increases that would cause interference to other transmissions, achieving spatially selective power control.
Data Source
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AI summary
A method and apparatus are disclosed, from the perspective of the UE, for deriving UE transmit power. Preferably, the method includes the UE deriving a first pathloss value measured from a first reference signal (1805). In addition, the method includes the UE deriving a second pathloss value measured from a second reference signal (1810). The method also includes the UE transmitting a first UL transmission wherein the UL transmit power of the first UL transmission is derived from the first pathloss value (1815). The method further includes the UE transmitting a second UL transmission wherein the UL transmit power of the second UL transmission is derived from the second pathloss value (1820).