IAB Node Dynamic FDM for Parent–Child Link Allocation
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Solution Overview
Problem
Existing IAB networks face challenges in efficiently managing frequency resources between parent and child links, leading to interference and suboptimal resource utilization due to implicit FDM methods that result in scheduling delays and limitations on dynamic resource allocation.
Innovation Solution
Implementing explicit FDM methods that allow for both semi-static and dynamic frequency domain resource configurations for parent and child links, using RRC and MAC CE signaling for semi-static resources and group common DCI signaling for dynamic resources, with clear prioritization rules to avoid conflicts and enable simultaneous transmissions/receptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If implicit FDM methods are used for frequency resource management between parent and child links, then device complexity is reduced, but resource utilization efficiency deteriorates and scheduling delays increase
Solution Approach 1:
The patent implements dynamic FDM by allowing the IAB node to flexibly allocate frequency domain resources between parent and child links based on real-time traffic conditions and link quality. The node can dynamically switch between using the same frequency band or different frequency bands for parent and child links, enabling adaptive resource management that improves efficiency while maintaining manageable complexity through standardized procedures.
Solution Approach 2:
The patent changes the frequency domain parameters (frequency bands, bandwidth parts, resource blocks) allocated to parent and child links based on scheduling decisions. By dynamically adjusting these parameters according to traffic demands and interference conditions, the system achieves better resource utilization without requiring overly complex management mechanisms.
2Device complexity
If implicit FDM methods are used for frequency resource management between parent and child links, then device complexity is reduced, but scheduling speed deteriorates due to delays
Solution Approach 1:
The patent employs semi-static frequency domain resource configuration where the IAB node receives pre-configured frequency domain parameters (such as bandwidth part configurations, resource block allocations) from the parent node in advance. This preliminary configuration allows the node to quickly make scheduling decisions without complex real-time calculations, reducing scheduling delays while maintaining manageable complexity.
3Object-affected harmful factors
If different operation bands are configured for parent and child links, then interference between links is reduced, but resource utilization efficiency deteriorates due to frequency resource isolation
Solution Approach 1:
The patent implements dynamic frequency band selection where the IAB node can switch between using the same frequency band for both parent and child links (when interference is low) and using different frequency bands (when interference is high). This dynamic approach allows the system to minimize interference while maximizing resource utilization by sharing frequency resources when conditions permit.
Solution Approach 2:
The patent applies different frequency domain configurations locally to different links based on their specific requirements and interference conditions. The IAB node can allocate different bandwidth parts, resource blocks, or frequency bands to parent and child links selectively, rather than enforcing a uniform frequency separation policy across all scenarios, thereby reducing unnecessary resource isolation.
4Productivity
If same frequency band is used for both parent and child links, then resource utilization efficiency is improved through frequency sharing, but interference between links increases
Solution Approach 1:
The patent implements dynamic frequency band selection where the IAB node can switch between using the same frequency band for both parent and child links (when interference is low) and using different frequency bands (when interference is high). This dynamic approach allows the system to minimize interference while maximizing resource utilization by sharing frequency resources when conditions permit.
Solution Approach 2:
The patent incorporates feedback mechanisms where the IAB node monitors the quality of parent and child links, including interference levels and signal conditions. Based on this feedback, the node adjusts its frequency domain resource allocation decisions, selecting whether to share or separate frequency bands to optimize performance while controlling interference.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatus for dynamic FDM between a parent link and a child link in an IAB network. According to an embodiment of the present disclosure, a method includes: receiving indication information from a parent node of an IAB node, wherein the indication information indicates at least one frequency domain resource of an operating band associated with one of a parent link between the IAB node and the parent node and a child link between the IAB node and a child node of the IAB node; and determining a set of frequency domain resources for the child link from the operating band at least based on the indication information.