Load-Specific Offset for Hidden Node Interference in LTE-U

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Solution Overview

Problem

In wireless communication systems, particularly in LTE-U, it is challenging to minimize interference from hidden nodes in unlicensed frequencies due to the inability of LTE cells to receive load information from non-operator WLAN APs, leading to suboptimal communication quality and fairness issues when coexisting with WLAN technology.

Innovation Solution

A method where a UE obtains BSS load information from WLAN APs, calculates a load-specific offset based on this information, and applies it to measurement report-triggering events to adjust reporting criteria, thereby minimizing interference and improving communication quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If LTE cells operate in unlicensed bands to increase data traffic capacity, then productivity is improved, but interference from hidden nodes increases due to inability to receive load information from non-operator WLAN APs

Engineering Contradiction:

Improvedata traffic capacityVSAvoidinterference from hidden nodes

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The UE autonomously obtains BSS load information from WLAN APs and calculates the load-specific offset itself, without requiring network infrastructure support. This self-service approach enables the UE to independently compensate for hidden node interference and make informed measurement reporting decisions in unlicensed bands

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention dynamically adjusts the measurement report-triggering event parameters by applying a load-specific offset that varies according to the BSS load information. This parameter change allows the LTE cell to adapt its measurement criteria based on the actual channel conditions and interference levels in the unlicensed band

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If measurement report-triggering events use fixed criteria, then device complexity is reduced, but communication quality deteriorates due to hidden node interference in unlicensed bands

Engineering Contradiction:

Improvemeasurement criteriaVSAvoidcommunication quality

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The measurement report-triggering event criteria are transformed from static to dynamic by introducing a load-specific offset that changes based on BSS load information. This dynamic adjustment mechanism maintains communication quality by adapting measurement thresholds to current interference conditions without significantly increasing device complexity

Inventive Principle:

Principle #15Dynamics

3Device complexity

If LTE cells cannot receive load information from non-operator WLAN APs, then device complexity is reduced, but fairness deteriorates in multi-technology coexistence

Engineering Contradiction:

Improveinformation reception capabilityVSAvoidfairness in coexistence

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The UE proactively obtains BSS load information from WLAN APs before making measurement reporting decisions. This preliminary action of gathering interference information enables the UE to anticipate and compensate for hidden node interference, ensuring fair coexistence with WLAN technology in unlicensed bands

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10349300B2Method and device for applying load-specific offset by terminal in wireless communication system

Publication Date: 2019.07.09 LG ELECTRONICS INC

AI summary

Provided are a method for applying a load-specific offset by a terminal in a wireless communication system and a device supporting same. A terminal can receive BSS load information from a WLAN AP, calculate a load-specific offset on the basis of the BSS load information, and apply the load-specific offset to a measurement report-inducing event.