IAB Resource Availability Signaling for TDM and FDM Coordination
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Solution Overview
Problem
Existing IAB networks face challenges in efficiently coordinating time-domain and frequency-domain resource utilization due to limitations in DCI format 2_5 payload size and the need for flexible resource multiplexing to enhance network performance and reduce latency.
Innovation Solution
Implementing separate DCI format 2_5 messages for time-domain and frequency-domain multiplexing configurations, allowing IAB nodes to efficiently manage TDM and FDM operations, thereby increasing resource utilization flexibility and reducing cross-link interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single DCI format 2_5 is used for resource availability indication, then the signaling structure is simple, but the payload size is insufficient to accommodate both time-domain and frequency-domain multiplexing configurations
Solution Approach 1:
The patent divides the resource availability indication into two separate DCI formats: DCI format 2_5 for time-domain multiplexing and a new DCI format for frequency-domain multiplexing. This segmentation allows each format to be optimized for its specific multiplexing type, accommodating both TDM and FDM configurations without exceeding payload size limits while maintaining clear functional separation.
Solution Approach 2:
The patent makes DCI format 2_5 universal by enabling it to indicate availability for both time-domain and frequency-domain resources through configurable indication fields. The same DCI format can serve multiple purposes depending on configuration, allowing flexible resource allocation while avoiding the need for entirely separate signaling formats for each multiplexing type.
2Adaptability or versatility
If time-domain and frequency-domain multiplexing are supported simultaneously, then resource utilization flexibility is enhanced, but coordination complexity and interference management become more difficult
Solution Approach 1:
The patent segments the resource coordination into separate time-domain and frequency-domain multiplexing mechanisms with distinct DCI formats. This allows independent management of TDM and FDM resources, reducing the complexity of coordinating both simultaneously by treating them as separate control planes while still enabling their combined operation for enhanced resource utilization flexibility.
Solution Approach 2:
The patent implements availability indication mechanisms that provide feedback to child IAB nodes about resource availability in both time and frequency domains. This feedback enables dynamic adaptation and coordination of multiplexing operations, allowing the system to manage complexity through informed decision-making at each node based on real-time resource status information.
3Measurement precision
If separate DCI formats are used for TDM and FDM configurations, then resource management precision is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the indication information into separate DCI formats tailored to specific multiplexing types, improving precision for each domain. However, it mitigates overhead by using segmented resource indication where only necessary resource blocks are indicated rather than requiring complete resource maps, reducing the quantity of signaling bits while maintaining precise control over TDM and FDM resource allocation.
Data Source
AI summary
A method (1100) by a parent LAB node (55) includes transmitting (1102), to an IAB node (60), information indicating an Al for a TDM resource configuration for an LAB-DU cell associated with the LAB node. The parent LAB node also transmits, to the LAB node, information indicating an AI for a FDM resource configuration for the LAB-DU cell.