IAB Node Timing Alignment for 5G Simultaneous Operations
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Solution Overview
Problem
Current wireless communication systems face challenges in timing alignment for integrated access and backhaul in 5G networks, particularly in supporting simultaneous operations and duplexing enhancements, which require more advanced timing alignment methods beyond the capabilities of existing specifications.
Innovation Solution
Proposed methods for transmit and receive timing alignment in IAB systems, including configuration and signaling embodiments that can be extended to a unified framework, allowing different timing alignment methods to be configured based on node capabilities and applied locally according to scheduling needs, to support enhanced duplexing and timing mode specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing timing alignment specifications are used, then basic timing alignment is maintained, but simultaneous operations and duplexing enhancements cannot be supported
Solution Approach 1:
The patent segments the timing alignment process into multiple independent components: separate timing alignment for access links and backhaul links, separate handling of downlink and uplink transmissions, and configurable timing alignment modes. This allows the system to support simultaneous operations by independently managing timing for different link types and directions, resolving the contradiction between versatility and accuracy.
Solution Approach 2:
The patent introduces dynamic timing alignment mechanisms where timing parameters can be adjusted in real-time based on operational mode, link conditions, and scheduling requirements. The system can dynamically switch between different timing alignment configurations to support various duplexing modes and simultaneous operations while maintaining timing accuracy through continuous adjustment and reconfiguration.
2Adaptability or versatility
If advanced timing alignment methods are implemented to support simultaneous operations, then versatility is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal timing alignment framework that can operate in multiple modes (full-duplex, half-duplex, time-division duplexing) using a common set of mechanisms. The same timing alignment infrastructure supports both traditional and advanced operations, reducing the need for separate complex systems for each mode while maintaining versatility across different operational scenarios.
Solution Approach 2:
The patent manages complexity by controlling timing alignment through parameter adjustments rather than structural changes. By modifying timing parameters, offsets, and configuration values, the system can support simultaneous operations and various duplexing modes without requiring fundamentally different system architectures, thereby limiting the increase in device complexity.
3Adaptability or versatility
If timing alignment is configured based on node capabilities locally, then adaptability is improved, but signaling overhead increases
Solution Approach 1:
The patent performs timing alignment configuration in advance during node capability exchange and connection establishment. Timing parameters, supported modes, and alignment preferences are determined and configured before actual simultaneous operations begin, reducing the need for frequent signaling updates during operation and minimizing ongoing signaling overhead while maintaining local adaptability.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for timing alignment in integrated access and backhaul. A method includes obtaining, for an integrated access backhaul (“IAB”) node of a wireless communication network, a first uplink transmission time, a downlink transmission time, and a second uplink transmission time. The method includes determining a timing alignment mode for the IAB node. The method includes transmitting an uplink signal from the IAB node according to one of the first uplink transmission time, the downlink transmission time, and the second uplink transmission time based on the timing alignment mode for the IAB node.


