IAB Node Beam Indication for DU Interference Management
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Solution Overview
Problem
There is no specific indication scheme for available and/or unavailable DU beams in Integrated Access and Backhaul (IAB) nodes, which can lead to interference issues in radio communication systems.
Innovation Solution
A scheme is proposed where a parent IAB node indicates available or unavailable DU beams using MAC CEs across multiple bandwidth parts, serving cells, and cells, reducing interference by enabling or disabling specific DU beams based on the indicated status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam indication schemes are implemented at the IAB-DU level, then interference management and beam resource allocation efficiency is improved, but device complexity and system overhead increase
Solution Approach 1:
The beam indication is segmented by associating it with specific MT serving cells rather than applying it globally. Each beam indication applies only to the indicated MT serving cell, allowing granular control of beam resources per cell while avoiding unnecessary complexity in cells where beam indication is not needed. This segmentation enables efficient beam resource allocation where required without increasing system overhead across the entire IAB-DU.
2Reliability
If beam indications are provided for multiple MT serving cells simultaneously, then interference management capability is improved, but information overhead and signaling complexity increase
Solution Approach 1:
The beam indication mechanism is segmented to operate independently for each indicated MT serving cell. The beam indication includes a serving cell ID that identifies which specific cell the indication applies to, allowing the network to provide interference management for multiple cells through separate, targeted indications rather than requiring a single comprehensive indication that would increase information overhead.
Solution Approach 2:
Beam indications are provided partially rather than comprehensively for all cells. The network provides beam indications only for the specific MT serving cells that require interference management, using the serving cell ID field to identify which cells are affected. This partial action approach maintains reliability for cells needing management while minimizing information overhead by not providing indications for cells where they are not required.
3Adaptability or versatility
If beam indications are applied across multiple bandwidth parts, then beam resource flexibility is improved, but device complexity and configuration overhead increase
Solution Approach 1:
The beam indication mechanism is segmented to operate at the MT serving cell level rather than requiring configuration across multiple bandwidth parts. Each beam indication is associated with a specific serving cell ID, allowing the same beam indication to be applied across multiple bandwidth parts within that cell without requiring separate configurations for each bandwidth part. This segmentation provides beam resource flexibility while minimizing configuration overhead.
Data Source
AI summary
A radio communication node is disclosed including a reception section that receives, via a medium access control-control element (MAC CE), a beam indication including a plurality of first fields, a plurality of second fields, and a plurality of third fields, each of the first fields being related to a first beam that is restricted for use in a distributed unit (DU), each of the second fields being related to a mobile termination (MT) serving cell and a DU cell that are associated with the first beam, each of the third fields being related to a second beam that is associated with the first beam and used in the MT; and a control section that controls communication using the beam indication. In other aspects, a communication method is also disclosed.