IAB Network Timing Offset Configuration Across Multiple Timing Modes
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Solution Overview
Problem
In integrated access backhaul (IAB) networks, the various timing configurations (modes) used by IAB nodes can cause misalignment and misinterpretation of timing information, leading to erroneous adjustments in uplink and downlink transmission timings, which affect communication between nodes and user equipment.
Innovation Solution
Methods for determining and adjusting the timing mode and offset based on received indications, using functions such as f(TΔ) and thresholds, to align transmission timings accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fixed timing mode is used in IAB networks, then device complexity is reduced, but adaptability to different network conditions deteriorates
Solution Approach 1:
The patent implements dynamic timing mode selection where IAB nodes can switch between multiple timing modes (e.g., timing advance mode, timing offset mode) based on real-time network conditions. The gNodeB dynamically configures timing parameters for child nodes depending on their operational state, enabling the system to adapt to varying backhaul conditions without requiring a completely complex redesign of the timing mechanism.
Solution Approach 2:
The patent changes timing parameters such as timing advance values, timing offsets, and synchronization settings based on network conditions. By adjusting these parameters dynamically, the system can optimize performance for different scenarios (e.g., high mobility vs. stable connections) while maintaining a relatively simple underlying timing framework.
2Adaptability or versatility
If multiple timing modes are implemented, then adaptability to different network conditions is improved, but device complexity increases
Solution Approach 1:
The patent segments the timing configuration into distinct modes (e.g., first timing mode for initial synchronization, second timing mode for optimized backhaul) that can be independently selected and applied. This segmentation allows the system to manage complexity by handling timing in discrete, manageable chunks rather than as a monolithic complex system.
Solution Approach 2:
The patent employs feedback mechanisms where IAB nodes report their operational status and network conditions back to the gNodeB, which then adjusts timing parameters accordingly. This feedback loop enables automatic adaptation to changing conditions, reducing the need for manual configuration and simplifying the overall system operation despite having multiple timing modes.
3Measurement precision
If timing offsets are dynamically adjusted, then synchronization accuracy is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary timing calculations and configurations before actual data transmission occurs. By pre-computing timing advances and offsets based on predicted network conditions and storing them in advance, the system can quickly apply synchronization without performing complex real-time calculations, thus maintaining high accuracy while minimizing processing delays.
Data Source
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AI summary
Embodiments include methods for a first network node configured to operate as a child node of a second network node in an integrated access backhaul (IAB) network. Such methods include receiving, from the second network node, an indication (TΔ-mode) of a timing offset between the second network node's downlink (DL) transmission timing and the second network node's uplink (UL) reception timing. Such methods include determining the following based on the indication: a particular timing mode (Tmode) used for communication between the first and second network nodes, with Tmode being one of a plurality of available timing modes; and a particular timing offset (TΔ) applicable to Tmode. Such methods include adjusting the first network node's DL transmission timing based on TΔ. Other embodiments include complementary methods for a second network node configured to operate as a parent node, as well as network nodes configured to perform such methods.