Downlink Power Amplifier Control Using Channel Delay Spread
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing power consumption by network entities due to varying channel delay spreads and signal-to-noise ratios, leading to inefficient use of power amplifiers.
Innovation Solution
Network entities disable power amplifiers based on user equipment (UE) reporting of delay spread and antenna array loss thresholds, allowing for power savings without compromising received signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power amplifiers are disabled to reduce power consumption, then energy efficiency is improved, but signal quality may deteriorate
Solution Approach 1:
The system dynamically adjusts the number of active power amplifiers based on real-time channel delay spread measurements and antenna array loss threshold reports from UEs. The network entity enables or disables power amplifiers dynamically according to current channel conditions, transitioning from static full-power operation to adaptive power management that balances energy efficiency and signal quality requirements.
Solution Approach 2:
The invention changes the operational parameters of power amplifiers by disabling specific amplifiers based on calculated antenna array loss thresholds and channel delay spread values. The network entity determines which power amplifiers to disable by comparing channel conditions against threshold criteria, thereby adjusting power consumption levels while maintaining minimum signal quality requirements.
2Measurement precision
If channel delay spread reporting is implemented, then power management precision is improved, but system complexity increases
Solution Approach 1:
The system implements a feedback mechanism where UEs report channel delay spread measurements and antenna array loss threshold values to the network entity. Based on this feedback, the network entity adjusts power amplifier operation to optimize energy efficiency. The feedback loop enables precise power management adapted to actual channel conditions without requiring overly complex centralized control.
Solution Approach 2:
UEs autonomously measure and report their own channel delay spread and antenna array loss threshold values to the network entity. This self-service approach allows the UE to provide necessary channel information without requiring complex network-side measurement systems, thereby reducing overall system complexity while maintaining measurement precision.
3Loss of energy
If power amplifiers are selectively disabled, then energy efficiency is improved, but control complexity increases
Solution Approach 1:
The system segments the power amplifier control into discrete decisions based on channel delay spread thresholds. Instead of continuously adjusting power levels, the network entity divides the control space into distinct states (enable/disable specific amplifiers) based on reported channel conditions, simplifying the control logic while achieving significant energy savings.
Solution Approach 2:
The control complexity is managed by changing operational parameters (power amplifier enable/disable state) based on simple threshold comparisons of channel delay spread and antenna array loss values. The network entity uses straightforward parameter adjustments rather than complex control algorithms, making the system more manageable while achieving energy efficiency improvements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network entity may indicate to a user equipment (UE) (e.g., in a downlink control message) a capability of the network entity to disable power amplifiers for downlink transmissions. In response to the capability indication, the UE may estimate and report to the network entity the delay spread and antenna array loss threshold of a downlink signal. Based on the reported delay spread and antenna array loss threshold, the network entity may determine a quantity of power amplifiers that may be disabled for downlink transmission without reducing the received signal power at the UE below a minimum threshold. The power amplifiers that the network entity disables may be the power amplifiers with input powers less than a threshold (e.g., less than a highest input power by a threshold).