NTN Handover Path Switching for Simultaneous Terminal Mobility
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Solution Overview
Problem
In non-terrestrial network (NTN) systems, the frequent and simultaneous handovers of terminal devices due to high-speed movement cause significant processing load and signaling congestion in the network, leading to handover delays and instability.
Innovation Solution
The proposed method involves the first access network device sending a path switch request message to the core network device before receiving the handover complete message, allowing the core network to process these requests in advance, thereby reducing handover delays and signaling congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the core network device processes path switch requests after receiving handover complete messages, then signaling interaction is simplified, but handover delay increases and handover efficiency decreases
Solution Approach 1:
The core network device receives and processes path switch request messages before receiving handover complete messages. This preliminary action allows the network to prepare path switching in advance, reducing handover delay while maintaining manageable signaling complexity through proper message sequencing and processing.
2Reliability
If a large quantity of terminal devices perform cell handover simultaneously due to NTN device movement, then network coverage is maintained, but processing load increases and signaling congestion occurs
Solution Approach 1:
The core network device processes path switch requests in advance before handover completion, preparing network resources and paths ahead of time. This preliminary processing distributes the workload over time, preventing signaling congestion while ensuring continuous network coverage for large numbers of handovering terminal devices.
3Productivity
If the first access network device waits to send path switch request until after receiving handover complete message, then message sequencing is simplified, but handover efficiency decreases
Solution Approach 1:
The first access network device sends the path switch request message to the core network device before receiving the handover complete message. This preliminary action accelerates handover efficiency by enabling parallel processing of path switching and handover completion, while the core network device manages the increased sequencing complexity through proper message handling.
Data Source
AI summary
Embodiments of this application provide a handover method and an apparatus and system for executing the method. The method may include receiving a handover request message from a second access network device. The handover request message includes time information of a terminal device to be handed over to a first access network device. The method may further include sending a path switch request message to a core network device. The path switch request message is sent between receiving the handover request message and receiving a handover complete message.