Full-Duplex Beam Pair Adjustment for Self-Interference Reduction

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Solution Overview

Problem

Full-duplex communication in wireless systems faces challenges due to self-interference issues at user equipment (UE) caused by concurrent transmission and reception, which affects the ability to detect signals from base stations, particularly in mmWave environments, leading to increased costs with additional digital filter hardware.

Innovation Solution

The solution involves determining and adjusting beam pairs at the UE to reduce self-interference by using a base station to manage beam pairing, where a processor receives requests to change beam pairs based on communication parameters, enabling the UE to switch to alternative beam pairs that minimize interference, allowing for continued full-duplex communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If digital filter hardware is embedded in highly integrated mmWave capable UEs to mitigate self-interference, then self-interference mitigation capability is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improveself-interference mitigation capabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces physical digital filter hardware with a software-based beam pair adjustment mechanism. The base station processor dynamically adjusts beam pairs to spatially separate transmit and receive signals, eliminating the need for additional hardware components while achieving self-interference mitigation through directional beamforming control

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes operational parameters (beam pairs) to mitigate self-interference. By dynamically adjusting the spatial orientation and configuration of beam pairs based on channel conditions, the system achieves interference reduction without adding hardware complexity, utilizing parameter optimization instead of structural modification

Inventive Principle:

Principle #35Parameter changes

2Reliability

Engineering Contradiction:

Improveself-interference mitigation capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent substitutes expensive hardware filters with software-based beam management. The base station uses processor-controlled beam pair adjustments to achieve spatial isolation between transmit and receive paths, eliminating the need for costly digital filter hardware while maintaining self-interference mitigation effectiveness

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs computationally lightweight beam pair adjustment algorithms that can be implemented using existing base station processing resources. This software-based approach is more cost-effective than embedding hardware filters in each UE, leveraging existing infrastructure rather than requiring expensive per-device components

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Measurement precision

If beam pairs are adjusted to reduce self-interference, then signal detection capability is improved, but communication coordination complexity increases

Engineering Contradiction:

Improvesignal detection capabilityVSAvoidcommunication coordination complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The base station processor acts as an intermediary that centrally manages beam pair adjustments. It receives channel state information, determines optimal beam pairs, and coordinates the changes between UE transmit and receive beams, simplifying the complexity by centralizing control at the base station rather than requiring distributed coordination between multiple UE components

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach effectively reduces self-interference, enhancing the UE's ability to detect base station signals while potentially reducing hardware costs by optimizing beamforming configurations, thereby improving spectral efficiency and user experience.

Implementation Method 1

determining beam pairing at user equipment (UE) for full-duplex communication

Methodology Applied

Scientific EffectBeamforming:

Data Source

PatentUS10938459B2Reduction of self-interference in full-duplex communication

Publication Date: 2021.03.02 QUALCOMM INC

AI summary

Certain aspects of the present disclosure provide a method for changing a beam pair utilized by a user equipment (UE) for communicating over a full-duplex frequency channel. The method includes establishing full-duplex communication with a base station (BS) utilizing a first beam pair comprising a first uplink beam and a first downlink beam utilized by the UE for the full-duplex communication. The method also includes transmitting a first signal to the BS, the first signal comprising a request to change the first beam pair. The method also includes receiving, via the first downlink beam, a second signal responsive to the request, the second signal configured to enable the UE to change from the first beam pair to a second beam pair and maintain full-duplex communication with the BS, wherein the second beam pair includes one or more of a second uplink beam or a second downlink beam.