5G IAB Node Transmission Timing Synchronization
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Solution Overview
Problem
In 5G NR wireless communications, existing technologies face challenges in maintaining synchronization among IAB nodes for simultaneous data transmission and reception, especially when supporting FDM or SDM, as traditional timing advance mechanisms fail to align downlink and uplink data transmission timings effectively, and may not account for GNSS timing capabilities.
Innovation Solution
A method and device for determining transmission timing that includes issuing or receiving timing adjustment information, using GNSS timing, or OTA/base station timing to synchronize downlink transmission timings among IAB nodes, allowing for flexible multiplexing and ensuring synchronization without mutual interference in multi-hop networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional timing advance mechanisms are used to synchronize IAB nodes, then downlink and uplink transmission timings can be aligned, but synchronization cannot be maintained when supporting FDM or SDM multiplexing modes
Solution Approach 1:
The patent implements dynamic timing adjustment by introducing separate timing advance parameters for downlink (TA_DL) and uplink (TA_UL) transmissions. The IAB node can dynamically select between FDM and SDM multiplexing modes and adjust timing parameters accordingly, enabling adaptability across different operational scenarios while maintaining synchronization reliability.
Solution Approach 2:
The patent changes the timing synchronization parameters by introducing independent TA_DL and TA_UL parameters instead of using a single timing advance value. This parameter differentiation allows the system to optimize timing for each direction separately, resolving the contradiction between maintaining synchronization and supporting flexible multiplexing modes.
2Adaptability or versatility
If IAB nodes use flexible cell layout and multiple multiplexing modes to expand coverage and improve capacity, then network flexibility increases, but timing synchronization among nodes becomes more difficult to maintain
Solution Approach 1:
The patent segments the timing synchronization mechanism into separate downlink and uplink components with independent timing advance parameters (TA_DL and TA_UL). This segmentation allows each direction to be optimized independently, enabling the network to maintain timing synchronization even when using flexible cell layouts and multiple multiplexing modes simultaneously.
Solution Approach 2:
The patent implements a feedback mechanism where the parent node monitors timing synchronization status and sends timing advance adjustment commands to child IAB nodes. This closed-loop feedback ensures that timing synchronization is continuously maintained across the multi-hop network, regardless of the flexibility in cell layout or multiplexing mode configurations.
3Productivity
If IAB nodes transmit and receive data simultaneously in different frequency resources or spatial directions, then resource utilization improves, but self-interference and timing alignment challenges increase
Solution Approach 1:
The patent applies local quality by assigning different timing advance parameters to different transmission directions and functions. Downlink transmissions use TA_DL while uplink transmissions use TA_UL, allowing each local operation to be optimized for its specific requirements. This enables simultaneous data transmission and reception in FDM/SDM modes while managing timing complexity through localized parameter application.
Data Source
AI summary
Disclosed are a transmission timing determination method, a transmission timing determination device, and a computer-readable storage medium. First timing adjustment information issued by a first node is received, and a first transmission timing of a second node is adjusted according to the first timing adjustment information, or a global navigation satellite system (GNSS) timing is used as the first transmission timing; and an adjustment manner of the first transmission timing is determined according to synchronization type indication information.