IAB Node Time-Difference Signaling for OTA Synchronization
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Solution Overview
Problem
Existing 5G NR communication systems face challenges in achieving efficient over-the-air synchronization among integrated access and backhaul (IAB) nodes, particularly in handling different timing cases, which can lead to alignment issues and inefficiencies in wireless communication.
Innovation Solution
The implementation of a time difference parameter for over-the-air synchronization at IAB nodes, allowing for adjustments based on multiple types of alignment, including downlink and uplink transmission/reception alignment, to enhance synchronization accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing 5G NR communication systems are used without additional timing parameters, then the system structure remains simple, but synchronization accuracy among IAB nodes deteriorates
Solution Approach 1:
The patent introduces a time difference parameter (Tdelta) as a new system parameter to improve synchronization accuracy. This parameter represents the time difference between downlink reception at the IAB-MT and uplink transmission at the IAB-DU, and is used to adjust timing alignments. By adding this parameter, the system can achieve more precise synchronization across multiple IAB nodes while maintaining manageable complexity through standardized parameter transmission from parent nodes.
2Adaptability or versatility
If multiple types of alignment are implemented, then adaptability to different timing cases improves, but device complexity increases
Solution Approach 1:
The patent implements a universal timing adjustment mechanism that handles multiple alignment types (downlink transmission alignment, uplink transmission alignment, downlink reception alignment, uplink reception alignment) through a single time difference parameter framework. The IAB node can apply the received Tdelta parameter across different alignment scenarios, making the system adaptable to various timing cases without requiring separate complex mechanisms for each alignment type.
Solution Approach 2:
The patent segments the timing alignment process into distinct types (case 1, case 6, case 7 alignments) while using a unified parameter transmission approach. Each alignment type is handled through specific application of the time difference parameter, allowing the system to manage complexity by dividing the alignment functionality into manageable segments while maintaining overall system simplicity through standardized parameter exchange.
3Productivity
If time difference parameter is transmitted from parent IAB node, then synchronization efficiency improves, but signaling overhead increases
Solution Approach 1:
The parent IAB node performs preliminary measurement and calculation of the time difference parameter before transmitting it to the child IAB node. This preliminary action allows the parameter to be pre-computed and transmitted in advance, improving synchronization efficiency by having the timing adjustment information available before the child node needs to apply it, while the parameter is transmitted only when necessary rather than continuously.
Solution Approach 2:
The time difference parameter acts as an intermediary that carries synchronization information from the parent IAB node to the child IAB node. This parameter serves as a compact mediator that encapsulates the timing adjustment information needed for synchronization, reducing the need for more complex and lengthy signaling messages while maintaining the necessary synchronization data transfer efficiency.
Data Source
AI summary
An integrated access and backhaul (IAB) node receives, from a parent IAB node, a time difference parameter for over-the-air (OTA) synchronization in an IAB network. The IAB node adjusts transmission or reception of the IAB node based on the time difference parameter for one of multiple types of IAB node alignment.