Radio Device Intermodulation Distortion Cancellation for Licensed Unlicensed Carrier Coexistence

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Solution Overview

Problem

In wireless communication networks, especially in 5G and NR systems, there is a challenge in efficiently operating radio devices that share both licensed and unlicensed frequency bands, as emissions from licensed carriers can interfere with the listen-before-talk procedure in unlicensed carriers, leading to reduced transmission capacity and energy efficiency.

Innovation Solution

A method and apparatus that determine whether operations in a licensed carrier interfere with those in an unlicensed carrier, and adaptively arrange operations to mitigate interference by reducing intermodulation distortion, enabling adaptive scheduling, and directional detection to ensure availability of the unlicensed carrier, thereby improving transmission capacity and energy efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If data transmission is performed in the licensed carrier, then transmission capacity is improved, but interference with the unlicensed carrier operation occurs

Engineering Contradiction:

Improvetransmission capacityVSAvoidinterference with unlicensed carrier

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies intermodulation distortion cancellation to convert the harmful interference caused by licensed carrier transmission into a beneficial solution. By pre-calculating and canceling the intermodulation distortion components that would interfere with unlicensed carrier reception, the system maintains high transmission capacity in the licensed band while protecting unlicensed band operations from harmful interference

Inventive Principle:

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

Solution Approach 2:

The patent implements preliminary anti-action by performing intermodulation distortion cancellation before the interference actually affects the unlicensed carrier reception. The system proactively identifies and removes the distortion components that would be generated by licensed carrier transmission, preventing the harmful effect from occurring in the first place

Inventive Principle:

Principle #9Preliminary anti-action

2Adaptability or versatility

If the radio device shares operations between licensed and unlicensed carriers, then spectrum utilization is improved, but interference between carriers increases

Engineering Contradiction:

Improvespectrum utilizationVSAvoidinterference between carriers

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces intermodulation distortion cancellation as an intermediary mechanism between the licensed and unlicensed carrier operations. This intermediary process actively manages the interaction between the two carriers by removing the harmful distortion components, enabling both carriers to coexist harmoniously with improved spectrum utilization while maintaining signal quality

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs parameter changes by dynamically adjusting the intermodulation distortion cancellation based on the operating conditions of both licensed and unlicensed carriers. The system monitors and adapts the cancellation parameters to optimize performance across different spectrum utilization scenarios, maintaining low interference while maximizing spectral efficiency

Inventive Principle:

Principle #35Parameter changes

3Reliability

If listen-before-talk procedure is performed in unlicensed carrier, then channel access reliability is improved, but transmission efficiency decreases due to interference from licensed carrier

Engineering Contradiction:

Improvechannel access reliabilityVSAvoidtransmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent converts the harmful interference from licensed carrier into a manageable parameter through intermodulation distortion cancellation. By canceling the distortion, the listen-before-talk procedure in the unlicensed band can reliably detect actual channel conditions without being misled by licensed carrier interference, maintaining both channel access reliability and transmission efficiency

Inventive Principle:

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

Data Source

PatentUS11350447B2Method and apparatus for operations in different frequency bands within a radio device

Publication Date: 2022.05.31 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Various embodiments of the present disclosure provide a method for configuring a radio device which is operable in a first carrier and a second carrier. The method comprises determining whether the operation in the first carrier is to interfere with the operation in the second carrier. The method further comprises arranging the operation in at least one of the first carrier and the second carrier based at least in part on the determination. According to the embodiments of the present disclosure, the operations of the radio device in different frequency bands can be arranged adaptively and flexibly, so that system capacity and energy efficiency can be improved.