IAB Node Timing Alignment Case Selection

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently managing timing alignment cases for Integrated Access and Backhaul (IAB) operations, which affect the stability and efficiency of wireless communication, particularly in next-generation radio access technologies like 5G New Radio (NR).

Innovation Solution

A method is proposed where nodes transmit information about their supported timing alignment cases to other nodes, enabling the selection of appropriate timing alignment cases for IAB operations, allowing for flexible multiplexing schemes and timing alignment methods between Distributed Units (DUs) and Mobile Terminals (MTs).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple timing alignment cases are supported for IAB operations, then the adaptability and versatility of the system is improved, but the device complexity and difficulty of managing timing relationships increase

Engineering Contradiction:

Improvetiming alignment case supportVSAvoidtiming management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The system dynamically selects timing alignment cases based on operational conditions. The IAB node and parent node can choose different timing alignment cases (e.g., first case with common timing advance, second case with separate timing advances) depending on the specific IAB operation requirements, making the system adaptable without permanently complex

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The timing alignment mechanism is segmented into multiple discrete cases, each handling specific scenarios. This segmentation allows the system to manage complexity by breaking down the overall timing management into manageable, well-defined cases rather than attempting a single universal solution

Inventive Principle:

Principle #1Segmentation

2Reliability

If timing alignment information is transmitted between nodes, then the reliability of IAB operations is improved, but the loss of time for information exchange increases

Engineering Contradiction:

ImproveIAB operation reliabilityVSAvoidcapability exchange time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Timing alignment capabilities and preferences are exchanged in advance during capability negotiation phases, before actual IAB operations begin. This preliminary action ensures that when operations start, both nodes already have the necessary timing alignment information, avoiding delays during critical operational phases

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The capability exchange mechanism acts as an intermediary that establishes timing alignment parameters beforehand. By using standardized capability signaling as the intermediary, the system efficiently transfers necessary timing information without requiring complex real-time negotiations during operations

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12058636B2Method for IAB multiplexing and timing relationship, and node using method

Publication Date: 2024.08.06 LG ELECTRONICS INC

AI summary

The present specification provides a method and an apparatus therefor, in which, in a method for performing an integrated access and backhaul (JAB) operation performed by a node in a wireless communication system, an initial access operation is performed with another node, information about a capability supported by the node is transmitted to the other node, wherein the information about the capability is information informing about at least one timing alignment case supported by the node among a plurality of timing alignment cases, and the IAB operation is performed on the basis of the at least one timing alignment case.