Mobile IAB Cell Access Signaling to Mitigate UE Interference

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Solution Overview

Problem

In mobile IAB scenarios, UEs outside vehicles can interfere with those inside due to unmanaged time and frequency resource allocation, and existing methods fail to predict or mitigate interference during network planning, leading to degraded quality of experience for onboard UEs and network overload.

Innovation Solution

A mechanism is introduced where radio network nodes transmit system information indicating whether a cell is mobile or stationary, allowing UEs and IAB nodes to determine access rights based on this indication, thereby filtering out unwanted connections and mitigating interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If mobile IAB cells are deployed to extend coverage, then network coverage and accessibility are improved, but interference from UEs outside vehicles to UEs inside vehicles increases

Engineering Contradiction:

Improvenetwork coverage areaVSAvoidinterference to onboard UEs

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary actions by broadcasting system information indicating mobile cell status before UEs attempt to connect. This allows UEs to pre-determine whether to access the cell, preventing interference-causing connections before they occur. The indication is provided in advance in system information blocks, enabling UEs to make informed access decisions.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If UEs are allowed to access mobile IAB cells without restriction, then network accessibility is improved, but network overload and ping-pong handovers increase

Engineering Contradiction:

ImproveUE access flexibilityVSAvoidnetwork stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system applies different access rules to different UE types based on their location and mobility characteristics. UEs inside vehicles are allowed to access mobile IAB cells while UEs outside vehicles are restricted. This localized differentiation of access rights maintains network stability while preserving necessary accessibility for authorized UEs.

Inventive Principle:

Principle #3Local quality

3Productivity

If time and frequency resources are shared between access and backhaul without management, then resource utilization is improved, but interference and quality of experience deteriorate

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidinterference to onboard UEs

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system extracts and separates the access function from mobile IAB nodes by restricting UE access to these nodes. This extraction removes the harmful interaction between access and backhaul operations, allowing dedicated backhaul resources to operate without interference from unmanaged access traffic while maintaining overall resource utilization.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20250392978A1Methods, radio network node, and user equipment or integrated access and backhaul node for handling communication

Publication Date: 2025.12.25 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Embodiments herein relate to a method performed by a radio network node for handling communication in a wireless communication network. The radio network node transmits to a UE or an IAB node system information comprising an indication of a cell, controlled by the radio network node, wherein the radio network node is an IAB node, and the indication indicates whether the cell is a mobile cell or not.