IAB Node Guard Periods for DU–MT Timing Alignment

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Solution Overview

Problem

Existing IAB nodes operate with DU and MT in time division multiplexing, leading to ambiguity and unclear operation when timing alignment occurs, necessitating a clear definition of operation in future systems with simultaneous DU and MT operations.

Innovation Solution

The method involves identifying overlapping resources for DU and MT operations, determining a guard period, and performing only one operation during that period to prevent ambiguity and ensure clear operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If DU and MT operate simultaneously (no-TDM operation), then resource utilization and system capacity are improved, but timing misalignment and operational ambiguity occur

Engineering Contradiction:

Improveresource utilizationVSAvoidtiming alignment

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the time domain resources into distinct regions: guard periods where only one operation (DU or MT) is performed, and non-guard periods where both can operate simultaneously. This segmentation resolves the timing misalignment issue by creating clear operational boundaries while maintaining overall simultaneous operation capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guard period acts as an intermediary buffer between DU and MT operations. During these guard periods, one operation is suspended to allow the other to proceed without interference, thereby mediating the timing conflict between simultaneous operations and preventing operational ambiguity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If guard period is introduced to resolve timing misalignment, then operational clarity is improved, but resource loss occurs due to restricted operations during guard period

Engineering Contradiction:

Improveoperational clarityVSAvoidresource loss

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

Instead of creating guard periods for all operations, the patent applies guard periods only partially - specifically during time domain overlaps between DU and MT operations. During non-overlapping periods, both DU and MT operate simultaneously without guard periods, thereby minimizing resource loss while maintaining operational clarity where needed.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12426017B2Method for operating IAB node in wireless communication system, and device using method

Publication Date: 2025.09.23 LG ELECTRONICS INC

AI summary

Provided are: a method for operating an integrated access and backhaul (IAB) node including a mobile terminal (MT) and a distributed unit (DU) in a wireless communication system; and a node using the method. Provided are: a method for operating another node communicating with the IAB node; and the other node using the method. The IAB node identifies a first resource allocated for the operation of the MT and a second resource allocated for the operation of the DU, the first resource and the second resource being resources in which overlap occurs in a time domain, determines a guard period in the first resource or the second resource, and performs either the operation of the MT or the operation of the DU in the guard period.