Uplink Power Control With Beamforming Gain Offset Compensation
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Solution Overview
Problem
Existing power control methods in wireless communications do not adequately account for beamforming gain offsets between uplink and downlink beams, leading to inaccurate power control and potential interference or battery waste in user equipment (UE).
Innovation Solution
Incorporate beamforming gain offsets into uplink power control by estimating and communicating parameters related to these offsets between user equipment (UE) and base stations (BS), using existing power control command signaling to adjust transmit power based on these offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beamforming gain offsets are not accounted for in power control, then power control is simpler, but power control accuracy deteriorates leading to interference and battery waste
Solution Approach 1:
The system performs preliminary estimation and communication of beamforming gain offset parameters between UE and BS before uplink transmission. The BS estimates the beamforming gain offset based on downlink reference beam measurements and communicates this parameter to the UE in advance, allowing the UE to adjust its transmit power accordingly before actual uplink transmission occurs.
2Reliability
If transmit power is increased to compensate for beamforming gain differences, then received power is sufficient, but interference increases and battery life decreases
Solution Approach 1:
The system implements feedback mechanisms where the BS measures the actual received uplink signal quality and compares it with expected values based on the beamforming gain offset parameter. The BS then sends power control commands to adjust the UE's transmit power, creating a closed-loop feedback system that optimizes power consumption while maintaining communication reliability.
3Measurement precision
If beamforming gain offset parameters are communicated between UE and BS, then power control accuracy improves, but signaling overhead increases
Solution Approach 1:
The beamforming gain offset parameter is integrated into existing power control command signaling structures already used in the system. Instead of creating separate dedicated signaling channels for beamforming gain offset communication, the parameter is embedded within existing downlink control information (DCI) formats and power control command structures, allowing multiple functions to be served by the same signaling mechanism.
Data Source
AI summary
Power control systems and methods are provided. Beamforming gain offset occurs in situations where downlink reference beams are different from uplink communication beams. Methods are provided of estimating beamforming gain offsets at the UE and the BS and incorporating these into a power control formula. At least one parameter relating to a beamforming gain offset between uplink and downlink beamformers at the UE and/or the BS is communicated between the UE and the BS. The UE transmits, and the BS receives, an uplink signal that has a transmit power that is based in part on the at least one parameter. The parameter can be a direct indication of one or more of the offsets, or can be another parameter that incorporates the effect of one or more of the offsets.