IAB Node Multiplexing Capability Determination for Interference Management

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Solution Overview

Problem

There is currently no efficient method to evaluate the capability of simultaneous signal reception and transmission in integrated access and backhaul (IAB) networks, leading to potential performance degradation due to interference power levels.

Innovation Solution

The proposed solution involves determining the multiplexing capability of IAB nodes based on channel or transmitter properties, and using this information to select an appropriate multiplexing scheme such as space division multiplexing (SDM), frequency division multiplexing (FDM), or time division multiplexing (TDM) for simultaneous operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If simultaneous transmission and reception are enabled in IAB nodes, then network spectral efficiency and throughput are improved, but interference between signals increases

Engineering Contradiction:

Improvenetwork spectral efficiencyVSAvoidinterference power level

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the simultaneous transmission and reception operations into different spatial channels using multiple antennas. By dividing the signal paths and using spatial separation, the system enables simultaneous operations while managing interference through spatial diversity rather than allowing uncontrolled interference accumulation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces channel state information and interference measurement mechanisms as intermediaries between the transmitting and receiving functions. These intermediaries enable the system to characterize and manage the interference effects, allowing simultaneous operations while maintaining acceptable signal quality through informed resource allocation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If simultaneous transmission and reception are implemented without evaluation methods, then operational flexibility increases, but performance degradation occurs due to unmanaged interference

Engineering Contradiction:

Improvesimultaneous operation capabilityVSAvoidsignal quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements feedback mechanisms where channel state information is continuously measured and reported back to the controlling entity. This feedback loop enables dynamic adjustment of transmission parameters based on actual channel conditions, ensuring that simultaneous operations maintain acceptable signal quality while preserving operational flexibility.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent performs preliminary channel measurements and interference assessments before enabling simultaneous transmission and reception. By evaluating channel conditions in advance and selecting appropriate configurations, the system ensures that simultaneous operations are only activated when channel conditions support reliable operation, thus maintaining both flexibility and signal quality.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If multiplexing schemes are selected without capability evaluation, then system complexity is reduced, but network throughput and latency performance deteriorate

Engineering Contradiction:

Improvemultiplexing selection complexityVSAvoidend-to-end network throughput

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent enables the system to automatically evaluate channel conditions and select appropriate multiplexing schemes without requiring complex external control. The IAB nodes themselves perform the capability evaluation and make multiplexing decisions based on measured channel state information, reducing overall system complexity while maintaining optimal throughput performance through distributed intelligence.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12328177B2Method to determine the capability of simultaneous operation in IAB nodes

Publication Date: 2025.06.10 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method and network node having integrated access and backhaul (IAB) functionality are disclosed. According to one aspect, a network node determines information concerning at least one of: (i) an impairment of a first signal from a first integrated access backhaul node that is caused by a second signal from a second IAB node and (ii) an impairment of the second signal that is caused by the first signal. The network node further selects a multiplexing capability for the network node based at least in part on the determined information concerning at least one of the impairments and further multiplexes signals for the first and second IAB nodes using the selected multiplexing capability.