Satellite Cell Handover Pre-configuration
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Solution Overview
Problem
Conventional cell handover solutions in satellite communication scenarios face challenges due to high transmission delays and complex network signaling procedures, leading to handover failures, as they require longer response times than what is feasible in satellite environments.
Innovation Solution
A method that involves a network device obtaining user information from a terminal device and determining handover information based on both user and network data, allowing the terminal to perform N consecutive cell handovers with pre-configured conditions, reducing the need for frequent signaling and minimizing response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cell handover solution is applied in satellite scenario, then handover procedure follows standard 5G protocol, but response time is too long causing handover failure
Solution Approach 1:
The network device pre-configures handover information including multiple target cell measurements and handover conditions before the terminal device actually needs to hand over. This allows the terminal to quickly execute handover by simply evaluating pre-computed conditions without waiting for network instructions during the critical handover moment, thus reducing response time while maintaining reliability
Solution Approach 2:
The handover process is divided into two distinct phases: a preparation phase where the network device collects measurements and determines handover conditions in advance, and an execution phase where the terminal device autonomously evaluates conditions and performs handover. This segmentation allows complex network processing to occur before the time-critical moment, separating reliability-dependent operations from speed-dependent operations
2Measurement precision
If conventional handover solution with frequent measurement reports is used, then handover decisions can be made accurately, but network signaling becomes complex and overhead increases
Solution Approach 1:
The patent extracts and separates the complex measurement collection and handover decision-making functions from the terminal device and concentrates them in the network device. The terminal device only needs to perform simple measurements and report results, while the network device handles the complex task of analyzing multiple target cell measurements and determining handover conditions, thus reducing terminal complexity and simplifying signaling
Solution Approach 2:
The network device merges multiple measurement reports for different target cells and combines them with pre-configured handover conditions to make comprehensive handover decisions. By consolidating the analysis of multiple measurements and the determination of handover timing in one place (the network device), the system reduces the number of separate signaling interactions needed while maintaining decision accuracy
Data Source
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AI summary
Embodiments of this application provide a cell handover method and apparatus. A first network device of a first cell obtains user information of a terminal device, and then the first network device may determine handover information based on the user information and running information of the first network device, so that after the first network device sends an RRC message including the handover information to the terminal device, the terminal device may perform N consecutive cell handovers based on the handover information. In the N cell handovers, the first network device only needs to obtain the user information once, to configure handover conditions for the N subsequent handovers in advance at a time. This simplifies a network signaling procedure, reduces network overheads, and reduces handover response time. The embodiments of this application are applicable to a network handover in a satellite scenario.