IAB Soft Frequency Resource Signaling for Low-Overhead Allocation
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Solution Overview
Problem
Managing frequency domain resources in Integrated Access and Backhaul (IAB) nodes is challenging due to sharing with terminals and other nodes, requiring new approaches to handle soft frequency resources efficiently with low signaling overhead and minimal changes to legacy systems.
Innovation Solution
Implementing a method for IAB parent nodes to transmit availability indications of soft frequency resources to child nodes using DCI signaling, allowing dynamic and semi-static indication of resource availability, and utilizing soft frequency resources based on these indications for efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If soft frequency resources are shared between IAB nodes and terminals, then resource utilization efficiency is improved, but signaling overhead increases and system complexity increases
Solution Approach 1:
The frequency domain resources are segmented into different types (soft and hard resources), and further segmented into resource blocks that can be independently allocated. This segmentation allows flexible sharing between IAB nodes and terminals while maintaining manageable complexity through structured resource management.
Solution Approach 2:
The patent implements dynamic resource allocation where the availability of soft frequency resources is indicated dynamically through DCI signaling. The system can adaptively allocate resources based on real-time conditions, improving utilization efficiency while managing complexity through dynamic rather than static allocation mechanisms.
2Adaptability or versatility
If dynamic indication of soft frequency resource availability is implemented, then resource allocation flexibility is improved, but signaling overhead increases
Solution Approach 1:
Instead of signaling the availability status of every individual resource element, the system uses partial indication by signaling at the resource block level. This partial action approach provides sufficient flexibility for resource allocation while significantly reducing the quantity of signaling bits required compared to full granular signaling.
Solution Approach 2:
The patent changes the parameter of resource indication from binary availability/unavailability to a spectrum of availability levels (fully available, partially available, not available). This parameter change allows flexible resource allocation while reducing signaling overhead by using more efficient encoding of the availability states.
3Productivity
If soft frequency resources are allocated to IAB child nodes, then communication efficiency is improved, but cross-link interference increases
Solution Approach 1:
The system implements feedback mechanisms where IAB parent nodes provide availability indications to child nodes about soft frequency resource status. This feedback loop enables the child nodes to adjust their transmission parameters and avoid causing or experiencing cross-link interference, thereby maintaining communication efficiency while managing interference levels.
Solution Approach 2:
The patent applies preliminary anti-action by having the parent node indicate resource availability in advance before the child node transmits. This提前 warning allows the child node to prepare appropriate transmission parameters that prevent cross-link interference from occurring in the first place, rather than reacting to interference after it occurs.
Data Source
AI summary
There is disclosed a method of operating an Integrated Access and Backhaul, IAB, parent node for a wireless communication network. The method includes transmitting, to an Integrated Access and Backhaul, IAB, child node, an indication of the availability of soft frequency resources. The disclosure also pertains to related methods and devices, e.g. pertaining to an Integrated Access and Backhaul child node, or a program product.