IAB Uplink Reception Timing for Flexible DU-MT Scheduling
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Solution Overview
Problem
Existing IAB nodes face challenges in efficiently managing simultaneous operations of distributed unit (DU) and mobile terminal (MT) due to fixed uplink reception timing, leading to delayed scheduling and inefficient resource utilization.
Innovation Solution
A method for a parent node to provide uplink reception timing information to a child IAB node, allowing flexible resource management by enabling different uplink reception timings for each child link, supporting both TDM and SDM/FDM operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed uplink reception timing is used in IAB nodes, then timing alignment is simplified, but resource utilization efficiency deteriorates and scheduling is delayed
Solution Approach 1:
The patent applies dynamics by transitioning from fixed uplink reception timing to dynamic timing adjustment. The IAB node determines multiple uplink reception timings based on different child links and adjusts the timing of distributed unit operations accordingly, enabling flexible resource allocation and immediate scheduling while maintaining manageable complexity through structured timing determination methods.
2Ease of operation
If fixed uplink reception timing is used in IAB nodes, then operation management is simplified, but scheduling speed deteriorates
Solution Approach 1:
The patent applies preliminary action by having the IAB node determine multiple uplink reception timings in advance based on different child links before actual scheduling occurs. This pre-determination of timing information enables immediate scheduling when resources become available, reducing scheduling delay while maintaining operation management simplicity through structured timing establishment.
3Device complexity
If single uplink reception timing is used, then device operation is simplified, but resource allocation flexibility deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the uplink reception timing into multiple distinct timings corresponding to different child links. The IAB node determines separate uplink reception timings for each child link, allowing flexible resource allocation across different links while maintaining simplified device operation through structured timing determination and clear association between timings and specific child links.
Data Source
AI summary
The present specification provides a method for performing an integrated access and backhaul (IAB) operation by an IAB node in a wireless communication system, and an apparatus therefor, the method comprising: performing an initial access operation with another node; receiving uplink reception timing information of a child IAB node of the IAB node from the other node; and performing the IAB operation on the basis of the uplink reception timing information, wherein the uplink reception timing information is information related to whether a distributed unit (DU) operation of the child IAB node and a mobile terminal (MT) operation of the child IAB node can be simultaneously performed with respect to at least one time resource.