NTN Cell Handover Using Set-Based Signaling to Cut Congestion
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Solution Overview
Problem
In non-terrestrial network systems, the large coverage area of cells leads to a high number of users, resulting in significant control signaling during cell handover, which causes congestion and a high handover failure rate due to simultaneous handovers by a large quantity of terminal devices.
Innovation Solution
A method involving grouping terminal devices into sets based on specific criteria, allowing network devices to transmit handover commands to these sets rather than individual devices, thereby reducing the number of simultaneous handovers and lowering failure rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large quantity of terminal devices simultaneously perform handover from a source cell to a target cell, then the handover process can be completed efficiently, but control signalling increases sharply causing congestion in the target cell and increasing handover failure rate
Solution Approach 1:
The patent segments terminal devices into multiple sets based on grouping information (such as terminal device ID, IMEI, or other identifiers). The source network device transmits handover information to different sets at different times or in different batches, thereby dividing the simultaneous handover process into multiple smaller handover events. This segmentation reduces the control signalling load on the target cell and prevents congestion while maintaining handover efficiency.
2Stability of the object's composition
If a large quantity of terminal devices simultaneously perform handover, then handover can be completed in a coordinated manner, but control signalling causes congestion in the target cell
Solution Approach 1:
The patent divides terminal devices into multiple sets and transmits handover information to these sets in a coordinated manner. The source network device controls the timing and sequence of handover information transmission to different sets, ensuring coordinated handover while preventing simultaneous signalling bursts that would cause congestion in the target cell.
Solution Approach 2:
The patent applies preliminary action by having the source network device transmit handover information to terminal devices in advance, organized by sets. This allows terminal devices to prepare for handover beforehand, reducing the need for simultaneous real-time signalling and thereby reducing control signalling congestion in the target cell while maintaining coordination.
3Object-generated harmful factors
If terminal devices are grouped into sets for handover, then control signalling is reduced and congestion is minimized, but the complexity of handover management increases
Solution Approach 1:
The patent uses a universal grouping mechanism that can be applied to different scenarios. The source network device uses grouping information (such as terminal device ID, IMEI, or other identifiers) to divide terminal devices into sets, and this same grouping approach can be used for various handover scenarios. This multi-functional approach reduces control signalling load while avoiding the need for complex scenario-specific management procedures.
Data Source
AI summary
The present application provides a cell handover method, a terminal device, and a network device. One example method includes: receiving, by a terminal device in a non-terrestrial (NTN) network, first information, wherein the first information comprises second auxiliary information of at least one of a target cell corresponding to a source cell or a neighboring cell corresponding to the source cell, wherein a physical cell identity (PCI) of a target cell is the same as a PCI of the source cell; performing downlink synchronization with the target cell; and accessing the target cell.