Interference Cancellation Power Control in Wireless Access Points
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Solution Overview
Problem
In wireless communication systems, particularly in uplink transmissions, interference mitigation is challenging due to the variability of wireless terminal locations and transmission powers, leading to unpredictable interference profiles, which complicates power control and resource allocation.
Innovation Solution
A system and method that involve access points measuring pilot signals from wireless terminals to identify and evaluate interfering transmissions, performing interference cancellation, and adjusting uplink transmission power levels based on the success of cancellation operations, allowing for terminal-specific power control to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If interference cancellation operations are performed at access points, then interference mitigation is improved, but device complexity increases
Solution Approach 1:
The patent introduces an interference cancellation module as an intermediary component within the access point that specifically targets and eliminates interfering signals. This module acts as a mediator between the received signal and the processing system, separating the interference cancellation function from the general signal processing pipeline, thereby managing complexity through functional decomposition.
Solution Approach 2:
The signal processing function is segmented into distinct modules: a signal separation module that identifies interfering signals, an interference cancellation module that removes them, and a normal processing module that handles the cleaned signal. This segmentation allows each module to be optimized independently and manages overall system complexity through modular architecture.
2Object-affected harmful factors
If terminal-specific power control is implemented, then interference mitigation is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the access point measures the effectiveness of interference cancellation and uses this information to dynamically adjust the transmission power of wireless terminals. The interference cancellation results are fed back to the power control module, creating a closed-loop system that adapts to changing interference conditions without requiring complex open-loop calculations.
Solution Approach 2:
The system enables wireless terminals to automatically adjust their transmission power based on feedback from the access point regarding interference cancellation effectiveness. The terminals self-regulate their power levels without requiring complex centralized control, simplifying the overall power control architecture while achieving interference mitigation.
Data Source
AI summary
Apparatus and methods for power control for mitigation or control of interference in a wireless communications environment. Power control techniques can consider the effectiveness of interference cancellation before making power control determinations. For example, where interference with a base station from an interfering wireless terminal is being canceled such that the effects of that interference are not adversely affecting operations of the base station, the offending terminal can be left unchanged, or its transmit power can be increased. On the other hand, where the interference cancellation operation is not able to cancel the effects of the interfering signal sufficiently, the operation can lower the uplink transmit power of the offending signal so as to not cause interference to the other base station.