IAB Node Timing Alignment via T Delta Exchange

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Solution Overview

Problem

Current wireless communication systems face challenges in aligning downlink and uplink transmission timings for stable and efficient Integrated Access and Backhaul (IAB) operations, particularly in next-generation radio access technologies like NR, which require precise timing alignment to enhance communication capacity and reliability.

Innovation Solution

The method involves receiving timing advance (TA) or T delta information from another node to align downlink and uplink transmission timings, allowing for effective IAB operations by adjusting these timings based on the received information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If timing advance information is not properly adjusted, then IAB operation complexity is reduced, but downlink and uplink transmission timing alignment deteriorates

Engineering Contradiction:
Improvetiming alignmentVSAvoidIAB operation complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces an intermediary mechanism where a T delta value is exchanged between nodes to facilitate timing alignment. This intermediary parameter acts as a mediator that enables precise synchronization of downlink and uplink transmissions without requiring complex direct timing adjustment protocols, thus resolving the contradiction between achieving reliable timing alignment and maintaining operational simplicity.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs parameter changes by introducing and adjusting the T delta parameter to achieve timing alignment. By modifying this specific timing parameter and exchanging it between nodes, the system can dynamically adjust transmission timings to maintain synchronization, thereby improving reliability while keeping the adjustment mechanism manageable through focused parameter control.

Inventive Principle:
Principle #35Parameter changes

2Reliability

If precise timing alignment is implemented for IAB operations, then communication reliability is improved, but system complexity increases

Engineering Contradiction:
Improvecommunication reliabilityVSAvoidsystem complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The T delta value serves as an intermediary that simplifies the timing alignment process. Instead of implementing complex direct synchronization between all nodes, the system uses this intermediary parameter to convey timing adjustment information, achieving reliable communication while reducing the overall system complexity through indirect but efficient timing coordination.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent focuses on changing and adjusting a specific timing parameter (T delta) to achieve precise alignment. By concentrating complexity on managing this single parameter rather than multiple timing aspects simultaneously, the system achieves high communication reliability while keeping the implementation complexity manageable through targeted parameter control.

Inventive Principle:
Principle #35Parameter changes

3Stability of the object's composition

If timing alignment methods are not standardized, then implementation flexibility is maintained, but communication stability deteriorates

Engineering Contradiction:
Improvecommunication stabilityVSAvoidtiming adjustment complexity
Core Design Contradiction:
Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent establishes a universal timing alignment method that can be applied across different IAB node configurations and scenarios. The T delta exchange mechanism serves multiple functions: it provides timing alignment information, enables synchronization, and works across various network topologies. This universal approach ensures communication stability while managing complexity through a single versatile mechanism rather than multiple scenario-specific solutions.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentUS11856543B2Method for adjusting timing for IAB and node using same
Publication Date: 2023.12.26 LG ELECTRONICS INC
  • US11856543B2 patent drawing
  • US11856543B2 patent drawing
  • US11856543B2 patent drawing

AI summary

The present specification provides a method for performing an integrated access and backhaul (IAB) operation performed by a node in a wireless communication system, and an apparatus therefor, the method comprising: performing an initial access operation with another node; receiving, from the other node, at least one piece of timing advance (TA) information or T delta information, wherein downlink transmission timing of the node and uplink transmission timing of the node are aligned or determined on the basis of the at least one piece of TA information or T delta information; and performing the IAB operation on the basis of the downlink transmission timing and the uplink transmission timing.