Wireless Interference Cancellation and Selective Power Control

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Solution Overview

Problem

Wireless communications face interference challenges due to increased user density, leading to inefficient power usage and reduced effectiveness of successive interference cancellation techniques when received power levels are too close together.

Innovation Solution

Implementing selective power control by lowering transmission power levels and using successive interference cancellation to decode combined signals, optimizing power usage and improving spectrum efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If transmission power levels are increased to overcome interference, then signal reliability is improved, but energy consumption increases and interference with other devices worsens

Engineering Contradiction:

Improvesignal reliabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

Instead of increasing power to overcome interference, the patent inverts the approach by using power reduction combined with interference cancellation. The receiving device cancels out interfering signals through signal processing, allowing the transmitting device to use lower power levels while maintaining reliable communication.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent converts the harmful effect of interference into a beneficial process by implementing successive interference cancellation. The interfering signals that would normally degrade performance are instead identified, reconstructed, and subtracted from the received signal, transforming the interference problem into a solution that enables lower transmission power.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If transmission power levels are increased to overcome interference, then signal reliability is improved, but interference with other computing devices increases

Engineering Contradiction:

Improvesignal reliabilityVSAvoidinterference with other devices

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent inverts the traditional approach by reducing power instead of increasing it. The receiving device compensates for the lower power transmission by actively canceling interfering signals, achieving reliable communication at lower power levels and reducing interference to other devices.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent transforms the interference problem into a solution by using successive interference cancellation to identify and remove interfering signals from the received composite signal, enabling reliable reception at lower transmission power levels and thereby reducing harmful interference to other devices.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If successive interference cancellation is used when received power levels are close together, then decoding capability is maintained, but computational efficiency decreases

Engineering Contradiction:

Improvedecoding capabilityVSAvoidcomputational efficiency

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies dynamic power control where the transmitting device adjusts its power level based on the receiver's capability to perform interference cancellation. When the receiver indicates it can perform successive interference cancellation, the transmitter dynamically lowers its power level, optimizing the balance between decoding capability and computational efficiency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the power level parameter dynamically based on the receiver's interference cancellation capability. By adjusting the transmission power parameter in response to capability indicators, the system optimizes computational efficiency while maintaining sufficient signal quality for successful decoding.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250254630A1Interference reduction for wireless communications using interference cancellation and selective power control

Publication Date: 2025.08.07 MICROSOFT TECHNOLOGY LICENSING LLC

AI summary

Disclosed in some examples are methods, systems, and machine-readable mediums in which interference is mitigated on a wireless radio frequency channel used by multiple computing devices by adjusting (e.g., lowering) the power level of one or more computing devices (e.g., mobile devises such as User Equipment (UE) devices) and using successive interference cancellation to decode the combined signals. Successive interference cancellation may first decode a strongest signal of a combined signal of all computing devices. The decoded signal is then subtracted from the combined signal. The strongest signal of that combined signal is then decoded and then subtracted and so on until all signals are decoded.