IAB Node Configuration for Seamless High-Speed Handover

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Solution Overview

Problem

Conventional handover methods in communication networks are inadequate for high-speed moving integrated access backhaul (IAB) nodes, leading to frequent service interruptions and reduced mobility robustness.

Innovation Solution

The implementation of a communication method that involves transmitting configuration information, such as radio link control channels, RLC channel mapping rules, or routing tables, between IAB nodes to enable seamless handover and dual connectivity, allowing for simultaneous data transmission and reception from multiple nodes, thereby minimizing service interruptions and enhancing mobility robustness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional handover methods are used for moving IAB nodes, then base station connectivity can be maintained, but service interruptions occur and mobility robustness deteriorates at high speeds

Engineering Contradiction:

Improvemobility robustnessVSAvoidservice interruption time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent transmits configuration information (RLC channel settings, routing tables, QoS parameters) from the target base station to the moving IAB node before handover occurs. This preliminary configuration ensures that when handover happens, the node can immediately establish communication without service interruption, as all necessary parameters are already prepared and validated by the target base station.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces a donor base station as an intermediary that coordinates the handover process. The donor base station manages the connection between the moving IAB node and target base stations, facilitating seamless handover by maintaining control plane connectivity and coordinating resource allocation, which prevents service interruptions during the handover transition.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If configuration information is transmitted between IAB nodes for dual connectivity, then handover robustness is enhanced, but device complexity increases

Engineering Contradiction:

Improvehandover robustnessVSAvoidconfiguration management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements a universal configuration information structure that can be applied across different handover scenarios and IAB node types. The configuration message format is standardized to include all necessary parameters (RLC channels, routing tables, QoS settings) in a single transmission, eliminating the need for multiple separate configuration procedures and reducing overall system complexity despite the comprehensive nature of the information exchanged.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20240365183A1Methods, devices, and computer readable medium for communication

Publication Date: 2024.10.31 NEC CORP

AI summary

According to embodiments of the present disclosure, a first device transmits configuration information associated with an Integrated Access Backhaul (IAB) node to a second device. The second device serves as a SN of the IAB node and the IAB node is moving. The configuration information comprises at least one of: a radio link control (RLC) channel of the IAB node, a RLC channel mapping rule of the IAB node or a routing table of the IAB node. In this way, the service interruption can be minimized and mobility robustness is enhanced.