IAB Timing Difference Signaling for Orthogonal Backhaul Links
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving timing alignment and interference mitigation between integrated access and backhaul nodes in new-generation mobile communication systems, particularly when frequency or spatial domain multiplexing is employed, leading to orthogonality issues between parent and child backhaul links.
Innovation Solution
A method for determining time difference information is proposed, where IAB nodes exchange configuration information to align transmission and reception timings, using tables and indices to adjust timing based on indication information, timing modes, and resource types, enabling orthogonal multiplexing between parent and child links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency or spatial domain multiplexing is employed for IAB nodes, then network flexibility and coverage are improved, but orthogonality issues between parent and child backhaul links occur leading to interference
Solution Approach 1:
The patent segments time resources into different time periods for different links. Specifically, it divides time into first time periods for parent backhaul links and second time periods for child backhaul links, ensuring that transmissions on different links occur at different times. This time-domain segmentation eliminates interference while maintaining the flexibility of frequency and spatial multiplexing.
Solution Approach 2:
The patent implements periodic time division multiplexing where parent and child backhaul links are allocated alternating time periods. This periodic scheduling ensures that interfering transmissions do not occur simultaneously, maintaining orthogonality between links while allowing both to operate with high flexibility in frequency and spatial domains.
2Ease of manufacture
If IAB nodes integrate backhaul and access links, then network deployment cost is reduced, but timing alignment between links becomes difficult achieving
Solution Approach 1:
The patent applies preliminary action by having the network controller pre-configure and indicate specific time periods for parent and child backhaul links before actual transmissions occur. This advance scheduling allows IAB nodes to align their timing without requiring complex real-time synchronization, thus achieving precise timing alignment while maintaining the cost benefits of integrated deployment.
Solution Approach 2:
The patent implements feedback mechanisms where the network controller monitors and adjusts time period allocations for backhaul links. By receiving feedback on timing performance and adjusting the scheduling accordingly, the system maintains precise timing alignment between integrated backhaul and access links while keeping deployment costs low.
Data Source
AI summary
A system and method for receiving timing information are disclosed herein. In one embodiment, a method performed by a first node includes receiving, by a first node from a second node, one of (1) first information and second information, or (2) third information. The first information includes configuration information of at least one of indication information, timing mode, or time resource type. The method includes determining, by the first node, time difference information according to the one of (1) the first information and the second information, or (2) the third information.