Transmit Power Control for Wireless Receiver Desense Mitigation
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Solution Overview
Problem
Wireless communication devices face interference issues due to co-located transmitters, leading to de-sensing of receivers, which results in dropped calls and poor call quality as existing power control procedures fail to adequately address de-sensing events.
Innovation Solution
A method and apparatus that adjust the transmit power level in response to de-sensing events, maintaining it at a nominal level for a specified time interval and gradually increasing the power limit to prevent further interference, using a controller to manage transmit power levels and set an upper limit to control power increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the transmit power level is increased to improve communication coverage and signal strength, then the transmitter can reach remote devices more effectively, but the receiver becomes desensed due to interference from the co-located transmitter
Solution Approach 1:
The patent implements dynamic transmit power control by adjusting the power level based on detected de-sense conditions. The controller monitors receiver performance and adaptively modifies transmit power, transitioning from static to dynamic power management to prevent receiver desensing while maintaining communication effectiveness.
Solution Approach 2:
The system employs feedback mechanisms where the controller detects de-sense events at the receiver and uses this information to adjust subsequent transmit power levels. This closed-loop control ensures that power adjustments are based on actual receiver conditions, preventing harmful interference while optimizing transmission performance.
2Use of energy by moving object
If existing power control procedures are used to manage transmit power, then power consumption is controlled, but they fail to adequately address de-sensing events causing dropped calls and poor call quality
Solution Approach 1:
The patent introduces specific parameter changes to existing power control procedures by implementing de-sense detection thresholds and associated power adjustment rules. When de-sense conditions are detected, the system modifies power control parameters to reduce transmit power, thereby preventing call drops and improving reliability while maintaining efficient power consumption.
3Speed
If the transmit power is rapidly adjusted to respond to changing conditions, then the system can adapt quickly to maintain communication, but this may cause additional instability and trigger more de-sensing events
Solution Approach 1:
The patent implements cushioning mechanisms by establishing hysteresis thresholds and gradual power adjustment rates. Instead of immediate full-power adjustments, the system applies incremental changes that cushion against abrupt transitions, thereby stabilizing transmit power while still responding to de-sense conditions and preventing oscillatory behavior.
Data Source
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AI summary
This disclosure provides systems, methods, and apparatus for mobile transmit diversity. In one aspect a method of controlling a transmit power level of a wireless communications apparatus is provided. The method includes adjusting the transmit power level of a transmitter of the wireless communications apparatus to a first transmit power level in response to detecting a de-sense event indicative of interference with a signal received by a receiver of the wireless communications apparatus due to emissions from the transmitter. The method further includes maintaining the transmit power level substantially at the first transmit power level for a first time interval in response to adjusting the transmit power level to the first transmit power level. The method further includes adjusting a transmit power level limit of the transmitter after the time interval at a rate for a second time interval.