IAB Node Proactive Handover via Candidate Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing relay apparatuses in mobile communication systems face challenges in dynamically managing handovers and maintaining reliable connections between base stations and user equipment, especially in scenarios where connection failures occur.
Innovation Solution
An Integrated Access and Backhaul (IAB) node is configured to receive information about candidate upper apparatuses from a network node, detect connection failures, and proactively select a new connection destination before a timer expires, ensuring seamless handover and connection maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay apparatus waits for timer expiration before selecting a new upper node, then the handover procedure follows standard protocol, but connection recovery time increases and network stability deteriorates
Solution Approach 1:
The relay node proactively selects a new upper node from candidate upper nodes before the timer expires after detecting connection failure. This preliminary action allows the relay apparatus to initiate handover procedures earlier, reducing connection recovery time while maintaining protocol compliance, thus resolving the contradiction between connection reliability and recovery time.
2Adaptability or versatility
If the relay apparatus dynamically switches data transfer routes, then network adaptability improves, but system complexity increases
Solution Approach 1:
The network node acts as an intermediary that provides candidate upper node information to the relay apparatus. This intermediary role simplifies the relay apparatus's decision-making process by pre-identifying suitable handover targets, enabling dynamic route switching while reducing the complexity of handover management for the relay node.
3Speed
If the relay apparatus proactively selects new connection destinations before timer expiration, then connection recovery speed improves, but risk of selecting suboptimal nodes increases
Solution Approach 1:
The network node performs preliminary evaluation and prepares candidate upper node information before the relay apparatus needs to switch routes. This advance preparation ensures that when the relay apparatus proactively selects a new upper node, it chooses from pre-validated candidates, thus maintaining both fast handover execution and accurate node selection.
Solution Approach 2:
The relay apparatus receives feedback from the network node regarding candidate upper nodes that are suitable for handover. This feedback mechanism provides the relay apparatus with validated information about potential target nodes, enabling fast proactive selection while ensuring selection accuracy through network-guided candidate identification.
Data Source
AI summary
A method is executed by an IAB node and comprises receiving, from a network node, information indicating candidate upper apparatuses which are candidates for a connection destination of the IAB node and to which a handover request for performing handover of the IAB node under the first upper apparatus is transmitted by the first upper apparatus; detecting a connection failure with the first upper apparatus after starting the relaying; in response to the detection of the connection failure, starting a timer and selecting a second upper apparatus as a new connection destination of the IAB node before the timer expired; and in response to the candidate upper apparatus including the second upper apparatus and configuring, by the network node, to try to connect the candidate upper apparatuses after the connection failure, transmitting a RRC message to the second upper apparatus to connect to the second upper apparatus.