Relay Node Handover Notification for IAB Synchronization

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Solution Overview

Problem

In cellular communication systems, particularly in 5G networks, the handover process between donor base stations involving relay nodes is complex, leading to potential communication disruptions due to unclear timing of handover completion by parent nodes, which can result in failed access attempts by child nodes during inter-donor IAB-node migration.

Innovation Solution

A communication control method where a first relay node, including a second relay node under it, performs handover from a first donor base station to a second donor base station together with the second relay node, and upon completing the handover, the first relay node transmits a notification to the second relay node indicating the handover completion, ensuring synchronized access to the target donor base station.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If handover is performed between donor base stations involving relay nodes, then network mobility and adaptability are improved, but communication disruptions occur due to unclear handover completion timing

Engineering Contradiction:

Improvenetwork mobilityVSAvoidcommunication continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The parent relay node sends a handover completion notification to the child relay node to provide feedback about the handover status. This feedback mechanism ensures the child node knows when the parent node has successfully completed handover to the target donor base station, preventing access failures and maintaining communication continuity during network mobility.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary handover preparation and execution at the parent node before the child node attempts access to the target donor base station. By completing the parent node's handover first and notifying the child node subsequently, the system ensures the target donor base station is ready to receive the child node's access request, preventing communication disruptions.

Inventive Principle:

Principle #10Preliminary action

2Speed

If handover timing is not clearly defined, then handover speed is improved, but access failures occur due to synchronization issues

Engineering Contradiction:

Improvehandover speedVSAvoidaccess success rate

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The handover completion notification serves as feedback that synchronizes the child relay node's access timing with the parent relay node's handover completion. This ensures the child node waits for the appropriate moment to access the target donor base station, maintaining both speed and reliability.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts the child node's access timing based on the parent node's handover completion status. Rather than using fixed timing, the child node waits for the dynamic handover completion notification before attempting access, ensuring synchronization without delaying the overall handover process.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20230328607A1Communication control method

Publication Date: 2023.10.12 KYOCERA CORP

AI summary

A communication control method according to a first aspect is a communication control method used in a cellular communication system. The communication control method includes performing, by a first relay node including a lower apparatus under the first relay node, handover from a first donor base station to a second donor base station together with the lower apparatus, and, upon completing the handover to the second donor base station, transmitting, by the first relay node and to the lower apparatus, a notification indicating completion of the handover.