Mobile IAB Node Mobility Anchoring for Stable Backhaul Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing mobility and handovers for mobile self-backhauling wireless access nodes, particularly when deployed on vehicles, leading to disruptions in connectivity and inefficient resource management.
Innovation Solution
Implementing a centralized unit (IAB-CU) to manage and support mobility of mobile self-backhauling wireless access nodes by terminating radio resource control connections and establishing backhaul channels, utilizing indicators and group memberships to identify and route messages from mobile IAB-nodes, and configuring dedicated physical and tracking area identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a mobile IAB-node is deployed on a moving vehicle to provide wireless access, then coverage area and accessibility are improved, but handover disruptions and connectivity stability deteriorate
Solution Approach 1:
The system segments the network into a stationary IAB-donor and a mobile IAB-node, allowing the mobile node to move freely while the donor remains fixed. This segmentation enables the mobile node to provide coverage in moving areas without compromising overall network stability, as the stationary donor anchors the backhaul connection.
Solution Approach 2:
The stationary IAB-donor acts as an intermediary between the core network and the mobile IAB-node. It terminates the radio resource control connection and provides a stable backhaul anchor point, mediating the connection between the moving mobile node and the fixed network infrastructure, thereby ensuring connectivity stability despite mobility.
2Adaptability or versatility
If traditional handover procedures are used for mobile IAB-nodes, then mobility support is provided, but handover disruptions and resource management inefficiency increase
Solution Approach 1:
The system performs preliminary actions by establishing the radio resource control connection termination at the stationary IAB-donor before mobility issues arise. This preliminary configuration enables seamless handovers without disruption, as the anchor point is pre-established and ready to maintain connectivity during mobility transitions.
Solution Approach 2:
Instead of having the mobile IAB-node maintain the radio resource control connection during movement, the system inverts the approach by having the stationary IAB-donor terminate the connection. This inversion eliminates handover disruptions at the mobile node, as the connection termination point remains fixed and stable throughout the mobility process.
3Adaptability or versatility
If mobile IAB-nodes are used in dynamic environments, then coverage flexibility is improved, but resource allocation efficiency deteriorates
Solution Approach 1:
The system applies homogeneity by using identical radio resource control procedures for both stationary and mobile IAB-nodes. The standardized connection termination and backhaul establishment processes ensure uniform resource allocation efficiency across different deployment scenarios, eliminating the need for complex differentiated resource management.
Solution Approach 2:
The stationary IAB-donor is designed with universal functionality to serve both as a backhaul anchor for mobile IAB-nodes and as a regular network node. This multi-functionality allows efficient resource allocation across diverse scenarios without requiring separate specialized mechanisms, maintaining productivity while supporting coverage flexibility.
Data Source
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AI summary
There is provided support for mobile self-backhauling wireless access nodes. A method comprises receiving a radio interface control plane message for establishing a radio resource control connection, determining that the received radio interface control plane message includes information indicating that the received radio interface control plane message originates from a mobile self-backhauling wireless access node, determining a controller node configured to: serve for a centralized unit of distributed units of different radio access nodes, and connect to distributed units deployed to a plurality of service areas of the radio access network. A radio resource control connection of the mobile self-backhauling wireless access node is caused to terminate at the determined controller node.