Feedback Receiver Multi-Functionality for LTE-U Interference Detection

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Solution Overview

Problem

Existing dual band radio apparatuses face challenges in efficiently configuring and selecting operational frequencies in unlicensed frequency bands without causing interference, particularly in the 5GHz band used by Wifi networks, due to the lack of a receiver branch for monitoring activities.

Innovation Solution

The method employs a feedback receiver to perform measurements in a second frequency band, detecting signals from other entities and selecting an operational frequency for communication, thereby eliminating the need for a separate Wifi module and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separate receiver branch is added to monitor activities in the second frequency band, then the ability to detect and select operational frequencies without interference is improved, but the device complexity and cost increase

Engineering Contradiction:

Improveability to detect and select operational frequency without interferenceVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The feedback receiver, originally designed solely to monitor transmitted signals for distortion correction, is enhanced to perform dual functions: it continues to observe the transmitted signal while also detecting external signals in the second frequency band to identify suitable operational frequencies. This multi-functionality eliminates the need for a separate receiver branch, reducing device complexity while maintaining the ability to detect interference-free frequencies

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The monitoring function for detecting external signals is merged with the existing feedback receiver rather than being implemented as a separate receiver branch. The feedback receiver is configured to observe both the transmitted signal and external signals in the second frequency band, combining multiple monitoring tasks into a single receiver unit, thereby reducing overall device complexity

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If a separate receiver branch is added to monitor activities in the second frequency band, then the ability to detect signals from other entities is improved, but the cost increases

Engineering Contradiction:

Improveability to detect signals from other entitiesVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The feedback receiver is enhanced to perform multiple functions: monitoring the transmitted signal for distortion correction and detecting external signals from other entities in the second frequency band. This multi-functionality eliminates the need for a separate receiver branch, reducing manufacturing costs while maintaining the ability to detect signals from other entities

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The feedback receiver serves itself by being configured to perform both its original function of monitoring transmitted signals and the additional function of detecting external signals. This self-service approach allows a single receiver to handle multiple monitoring tasks that would traditionally require separate dedicated receivers, thereby reducing overall system cost

Inventive Principle:

Principle #25Self-service

3Ease of manufacture

If the feedback receiver is used to perform measurements in the second frequency band, then cost-effectiveness is improved by eliminating the need for a separate receiver, but the measurement precision may be affected

Engineering Contradiction:

Improvecost-effectivenessVSAvoidmeasurement precision

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The feedback receiver is configured to perform multiple measurement tasks: monitoring the transmitted signal for distortion correction and performing measurements in the second frequency band to detect external signals. By carefully managing the receiver's operation and signal processing, it maintains sufficient measurement precision for both functions while eliminating the need for a separate receiver, thereby improving cost-effectiveness

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The feedback receiver operates dynamically, switching between monitoring the transmitted signal and performing measurements in the second frequency band as needed. This dynamic operation allows the single receiver to handle multiple measurement tasks with adequate precision by allocating its measurement capacity appropriately, maintaining measurement quality while reducing overall system cost

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3195645B1Method and arrangement for multi band communication

Publication Date: 2019.11.06 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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Figure 5a~5b

AI summary

Herein a Radio Access node for multi band communication and a method therein are described. The Radio Access node is configured for communication with at least one wireless device in a first frequency band. The method comprises performing at least one measurement in a second frequency band, by use of a feedback receiver. The at least one measurement is performed in order to detect signals, in the second frequency band, produced by other entities than the Radio Access node. The feedback receiver is also operable to measure signals transmitted by the Radio Access node.