Multiple OLLA Values for LTE-NR Interference Avoidance

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Solution Overview

Problem

Current outer loop link adaptation (OLLA) systems in cellular networks fail to adequately address interference between 4G LTE and 5G NR networks, leading to inefficient channel quality management and reduced data transmission success rates due to the inability to differentiate and compensate for various types of interference.

Innovation Solution

Implementing multiple OLLA values specific to different interference types, such as NR-NR, LTE-LTE, and NR-LTE interference, which are determined by analyzing interference data structures and used to adjust modulation and coding schemes dynamically, thereby improving data rate calculations and scheduling processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single OLLA value is used for channel quality adjustment, then the system is simple to implement, but it cannot adequately compensate for different types of interference (NR-NR, LTE-LTE, NR-LTE)

Engineering Contradiction:

ImproveOLLA system complexityVSAvoidinterference compensation accuracy

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent divides the single OLLA value into multiple separate OLLA values, with each value dedicated to compensating for a specific interference type (NR-NR interference, LTE-LTE interference, and NR-LTE interference). This segmentation allows the system to independently optimize compensation for each interference type, resolving the contradiction between system simplicity and interference compensation accuracy.

Inventive Principle:

Principle #1Segmentation

2Reliability

If multiple OLLA values are implemented for different interference types, then interference compensation accuracy improves, but system complexity increases

Engineering Contradiction:

Improvedata transmission success rateVSAvoidOLLA process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by assigning specific OLLA values to specific interference types, allowing each interference type to receive tailored compensation parameters. This enables precise, localized compensation for NR-NR, LTE-LTE, and NR-LTE interference respectively, improving data transmission success rates while managing complexity through targeted rather than universal approaches.

Inventive Principle:

Principle #3Local quality

3Device complexity

If existing OLLA techniques are used, then the system maintains simplicity, but interference between 4G LTE and 5G NR networks cannot be adequately compensated

Engineering Contradiction:

Improvelink adaptation system complexityVSAvoidinterference between network types

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of inter-network interference into a beneficial opportunity for system optimization. By identifying and characterizing specific interference types (NR-NR, LTE-LTE, NR-LTE), the system can apply targeted OLLA compensation that transforms the interference problem into a basis for improved link adaptation, ultimately enhancing data transmission success rates across diverse network conditions.

Inventive Principle:

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

Data Source

PatentUS11812456B2Interference avoidance based on multiple outer loop link adaptation (OLLA) processes

Publication Date: 2023.11.07 VERIZON PATENT & LICENSING INC

AI summary

The disclosed embodiments are directed toward improvements in dynamic spectrum sharing (DSS) between cellular network technologies. In one embodiment, a method is disclosed comprising initiating scheduling for a resource in a slot and determining a neighboring base station associated with user equipment (UE). The method then determines a type of interference associated with the neighboring base station and the slot and identifies an outer loop link adaptation (OLLA) value associated with the type of interference. An effective data rate is calculated based on the OLLA value and the method completes scheduling using the effective data rate.