IAB Relay Node Migration With Preconfigured Backhaul Context

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Solution Overview

Problem

The migration of a relay node in a communication system results in excessive signaling overhead, interruption of user data transmission, and significant time delay due to the need for handover and migration of the distributed unit portion, leading to signaling storms.

Innovation Solution

A method involving nodes in the communication system to exchange messages that configure the relay node for migration, including information on backhaul links, addresses, and configuration keeps, to minimize signaling overhead and maintain data transmission continuity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the relay node performs migration by completing handover of mobile terminal portion and migration of distributed unit portion, then the relay node can switch to a new upper-level node, but excessive signaling overhead and signaling storms occur

Engineering Contradiction:

Improverelay node migration capabilityVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The target donor node prepares user context information in advance before the actual migration occurs. The configuration includes pre-establishing backhaul link parameters, routing information, and channel configurations so that when migration is triggered, the relay node can directly use the pre-prepared configuration without undergoing complex real-time signaling exchanges, thereby reducing signaling overhead during migration.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of creating entirely new configurations during migration, the system copies and reuses existing valid configurations from the source path. The target donor node obtains and replicates the mobile terminal portion configuration and distributed unit portion configuration from the source, then applies them to the target path, avoiding the need to re-establish all parameters through extensive signaling.

Inventive Principle:

Principle #26Copying

2Adaptability or versatility

If the relay node completes migration procedure with signaling interactions, then the relay node can be reconfigured, but user data transmission is interrupted or experiences large time delay

Engineering Contradiction:

Improverelay node reconfiguration capabilityVSAvoiddata transmission interruption time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The target donor node performs preliminary preparation of user context information including backhaul link configuration, routing identification information, and channel parameters before the migration event. This pre-prepared configuration allows the relay node to switch paths without waiting for real-time configuration establishment, thereby eliminating data transmission interruption or reducing it to minimal time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system maintains continuous data transmission capability during migration by preparing the target path in advance. The user context information is pre-configured so that when migration occurs, data flow can be seamlessly switched from source to target path without interruption. The mobile terminal portion continues serving users while the distributed unit portion migrates, ensuring uninterrupted service.

Inventive Principle:

Principle #20Continuity of useful action

3Adaptability or versatility

If traditional migration procedure is used for relay node, then the relay node can change upper-level node, but large number of signaling interactions are required

Engineering Contradiction:

Improveupper-level node change capabilityVSAvoidnumber of signaling interactions

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The target donor node prepares all necessary user context information in advance including backhaul link parameters, routing configurations, and channel settings. This pre-prepared configuration eliminates the need for extensive real-time signaling interactions during migration, as the relay node can directly apply the pre-configured parameters rather than negotiating them through multiple signaling exchanges.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system copies existing valid configurations from the source path to the target path during migration. The target donor node obtains the mobile terminal portion configuration and distributed unit portion configuration from the source, then replicates them for use on the target path. This copying approach dramatically reduces the number of signaling interactions compared to creating entirely new configurations.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS12520130B2Nodes in communication network and methods thereof

Publication Date: 2026.01.06 SAMSUNG ELECTRONICS CO LTD

AI summary

The present disclosure provides a source integrated access and backhaul (IAB)-central unit (CU) in a communication system and a method thereof. The method may comprise: sending, to a target IAB-CU, a request message including information for requesting to configure a relay node to migrate; and receiving, from the target IAB-CU, a response message including information for configuring the relay node to migrate.