Mobile IAB TAU Handling for High-Speed Train Tracking Areas
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Solution Overview
Problem
Mobile IAB nodes installed in high-speed trains cause a significant increase in TAU storms due to frequent TAU procedures, leading to excessive radio access and signaling loads, as well as increased power consumption by terminal devices.
Innovation Solution
A TAU method and device based on a mobile IAB node that initiates a TAU procedure using received TAC list information when a new TAI is discovered, allowing the AMF to update location information of terminal devices without frequent handovers, thereby reducing TAU storms and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices initiate TAU procedures when entering new tracking areas during high-speed rail travel, then location information is updated, but massive random access load and signaling load are generated on the network
Solution Approach 1:
The mobile IAB node acts as an intermediary between terminal devices and the core network. It collects TAI information from multiple terminal devices and consolidates TAU requests, then forwards them to the AMF in bulk. This intermediary function reduces the number of individual signaling interactions between terminal devices and the core network, thereby reducing random access load and signaling load while maintaining location information updates.
2Reliability
If terminal devices frequently initiate TAU procedures during high-speed rail travel, then location information is updated, but power consumption increases significantly
Solution Approach 1:
The mobile IAB node merges multiple individual TAU procedures from different terminal devices into a single consolidated TAU request. Instead of each terminal device independently initiating separate TAU procedures when entering new tracking areas, the mobile IAB node aggregates these requests and submits them collectively to the AMF. This merging approach maintains location information updates while significantly reducing the frequency of TAU initiations, thereby lowering power consumption for terminal devices.
3Reliability
If mobile IAB nodes are installed in high-speed trains to provide communication services, then communication service availability is improved, but TAU storms occur due to frequent tracking area transitions
Solution Approach 1:
The mobile IAB node serves as an intermediary that buffers and consolidates TAU requests generated during high-speed rail travel. By collecting TAI information from terminal devices and submitting consolidated TAU requests to the AMF, it prevents the propagation of TAU storms to the core network while maintaining communication service availability for terminal devices throughout the train journey.
Solution Approach 2:
The mobile IAB node performs preliminary collection and consolidation of TAI information from multiple terminal devices before initiating TAU procedures with the AMF. This preliminary action allows the system to prepare batched location update requests in advance, reducing the frequency and impact of TAU storms on the core network while ensuring communication services remain available.
Data Source
AI summary
Embodiments of the present disclosure disclose a TAU method and device based on a mobile IAB node to solve the problem that a terminal device in a cell provided by the mobile IAB node is prone to cause a TAU storm. The method is executable by the mobile IAB node, and includes: receiving first TAC list information; and initiating a TAU procedure based on the first TAC list information in a case that a new TAI is discovered, where the TAU procedure is used by a first AMF to update location information of the terminal device in the cell provided by the mobile IAB node.