Per-Antenna Uplink Power Control for Wireless Systems
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Solution Overview
Problem
Current wireless communication systems, such as LTE, use a single power value for all antennas of a user equipment (UE), which can lead to inefficiencies due to differing fading environments and antenna imbalances, affecting system performance.
Innovation Solution
A method for wireless communications that involves receiving power adjustment parameters for a subset of antennas, calculating individual transmit power values based on these parameters, and transmitting signals using the calculated power, with the option to transmit power headroom information to calibrate and optimize antenna power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common power value is used for all antennas of a user equipment, then the device complexity is reduced and power control is simplified, but the system performance deteriorates due to differing fading environments and antenna imbalances
Solution Approach 1:
The patent divides the power control mechanism into antenna-specific segments by introducing antenna-specific power adjustment parameters (δl) for each antenna l. This segmentation allows independent power control for each antenna, addressing the fading environment differences and antenna imbalances while maintaining manageable complexity through structured parameter management.
Solution Approach 2:
The patent applies local quality by allowing different power adjustment parameters for different antennas based on their individual channel conditions. Each antenna l receives a tailored power adjustment parameter δl that reflects its specific fading environment, rather than applying a uniform power control approach across all antennas.
2Reliability
If antenna-specific power adjustment parameters are introduced for each antenna, then the system performance improves by accounting for fading environments and antenna imbalances, but the device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the base station measures the uplink signal quality for each antenna and determines appropriate power adjustment parameters δl. This feedback loop allows the system to adapt to changing channel conditions and antenna characteristics, improving performance while managing complexity through automated parameter adjustment.
Solution Approach 2:
The patent changes the power control parameters from a single common value to multiple antenna-specific parameters (δl for each antenna l). This parameter change enables the system to account for individual antenna characteristics and fading environments, improving reliability while the structured parameter management keeps complexity manageable.
3Measurement precision
If power headroom information is transmitted for each antenna, then the power control precision is improved, but the loss of information increases due to additional signaling overhead
Solution Approach 1:
The patent applies partial action by transmitting power headroom information selectively for antennas that require individual power control. Rather than always transmitting full power headroom information for all antennas, the system transmits this detailed information only when antenna-specific power adjustment is beneficial, reducing signaling overhead while maintaining precision where needed.
Data Source
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Figure 3
Figure 3A
AI summary
Certain aspects of the present disclosure provide closed loop and open loop power control techniques for each antenna of the user equipment (UE). The access point may measure the received signals from each antenna of the user equipment, calculate a power adjustment parameter for each antenna of the UE, and transmit the parameters to the UE. The UE may use the adjustment parameters to determine the transmit power value for each antenna. In addition, the UE may measure the path loss for each antenna and update the transmit power per antenna based on the path loss and other parameters.