Handover Request Indication for LTE to 5G Transition
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Solution Overview
Problem
In the context of handover processes between LTE and 5G systems, the preparation time for dual connectivity can be lengthy, leading to potential handover failures, especially when the signal quality is poor, which affects user experience.
Innovation Solution
A handover method where a source base station sends a handover request message to a target base station with indication information suggesting not to establish dual connectivity, allowing the target base station to determine whether to establish dual connectivity based on this information, thereby reducing preparation time and preventing handover failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual connectivity is established during handover, then connectivity reliability is improved, but handover preparation time increases
Solution Approach 1:
The source base station performs preliminary assessment of handover conditions and pre-determines whether dual connectivity should be established. By evaluating signal quality, load conditions, and service requirements before handover execution, the source base station can include appropriate indication information in the handover request message, allowing the target base station to prepare the appropriate connectivity mode in advance, thus reducing actual handover preparation time.
Solution Approach 2:
The handover mechanism dynamically adapts between single connectivity and dual connectivity modes based on real-time network conditions. The indication information in the handover request message enables dynamic decision-making about connectivity mode, allowing the system to flexibly switch between modes rather than always establishing dual connectivity, thus optimizing the balance between reliability and preparation time.
2Stability of the object's composition
If dual connectivity is established during handover, then service continuity is improved, but handover process complexity increases
Solution Approach 1:
The complex dual connectivity establishment process is extracted and simplified through the use of indication information in the handover request message. Instead of requiring complex negotiations and multiple signaling exchanges between source and target base stations, the indication information directly conveys the connectivity mode decision, extracting the essential decision-making element from the complex handover process and simplifying the overall procedure.
Solution Approach 2:
The indication information acts as an intermediary carrier that transmits the connectivity mode decision from the source base station to the target base station. This intermediary mechanism simplifies communication by encoding complex connectivity decisions into standardized message fields, reducing the need for additional complex signaling interactions and making the handover process more manageable.
3Speed
If immediate handover execution is performed, then handover speed is improved, but handover failure risk increases
Solution Approach 1:
The source base station performs preliminary evaluation of handover suitability by assessing signal quality, target cell conditions, and service requirements before triggering immediate handover. This preliminary action ensures that only appropriate handover candidates are selected for immediate execution, filtering out risky scenarios and thereby maintaining high success rates while enabling fast handover where conditions permit.
Solution Approach 2:
The system changes the parameter of connectivity mode (single vs. dual connectivity) based on evaluated conditions. By dynamically adjusting this parameter according to signal quality and network state, the system can optimize handover speed for favorable conditions while ensuring reliability for challenging conditions, thus resolving the contradiction between speed and success rate.
Data Source
AI summary
The present application relates to the field of communications, and disclosed are a handover method, a handover device and a computer readable storage medium. In the embodiments of the present application, by means of carrying first indication information in a handover request message sent by a base station where a source cell is located to a base station where a target cell is located, a recommendation may be provided to the target cell when determining whether to establish a dual connection, so that when the current cell handover is relatively urgent, cell handover may be immediately carried out by preventing the target cell from establishing the dual connection, reducing the probability of handover failure, and improving the user experience.