Mobile Relay Node Service Continuity in Cellular Networks
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Solution Overview
Problem
The complexity of mobile Integrated Access and Backhaul (IAB) nodes in cellular communication systems, particularly when they connect to either a donor node or an intermediate stationary IAB node, poses challenges in service continuity and network management.
Innovation Solution
A communication control method where a mobile relay node performs predetermined processing when connected to an intermediate relay node that is stationary without movement, including stopping services for user equipment or operating as another intermediate relay node, and connects to an intermediate relay node in an RRC idle or inactive state to handle emergency calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mobile relay node connects to an intermediate relay node that is stationary without movement, then service continuity for user equipment is maintained, but the mobile relay node must stop services or operate as a stationary node, reducing its mobility functionality
Solution Approach 1:
The system dynamically adjusts the operational state of the mobile relay node based on connection status. When connected to a stationary intermediate relay node, the mobile relay node transitions to a stationary operational mode, maintaining service continuity while accepting the limitation of reduced mobility functionality in this specific context
2Use of energy by moving object
If a mobile relay node operates in RRC idle or inactive state to save resources, then energy efficiency is improved, but the node cannot handle emergency calls directly
Solution Approach 1:
The stationary intermediate relay node acts as an intermediary that enables the mobile relay node in RRC idle/inactive state to handle emergency calls. The intermediate relay node maintains the necessary connection and routing information, allowing emergency services to be routed through the mobile relay node without requiring it to be in RRC connected state
3Reliability
If the mobile relay node maintains full service functionality while connected to intermediate relay node, then service continuity is ensured, but network complexity and management overhead increase
Solution Approach 1:
The system extracts and separates the service continuity function from the mobile relay node's full functionality. By connecting to the stationary intermediate relay node, the mobile relay node offloads certain management functions, reducing the complexity of network management while maintaining service continuity for user equipment
Data Source
AI summary
In an aspect, a communication control method is used in a cellular communication system. The communication control method includes performing, by a mobile relay node, predetermined processing when the mobile relay node has connected to an intermediate relay node that is stationary without movement. The predetermined processing is one of: stopping, by the mobile relay node, a service for a user equipment under control of the mobile relay node; or operating, by the mobile relay node, as another intermediate relay node that is stationary without movement.