5G Terminal Interrupt Time Adjustment for Handover
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Solution Overview
Problem
In the 5G mobile communication system, the Make Before Break handover process faces challenges in adapting to different subcarrier spacings, frequencies, and frequency ranges between source and destination cells, making it difficult to follow the procedures effectively as in LTE, which are limited to intra-frequency handovers.
Innovation Solution
A terminal with a control unit that determines and adjusts the interrupt time based on the combination of subcarrier spacings and frequencies of the source and destination cells, allowing for continuous radio link monitoring and carrier aggregation during the handover process, thereby maintaining communication and ensuring a smooth transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the Make Before Break handover procedure is applied in 5G with different subcarrier spacings and frequencies, then handover flexibility and adaptability are improved, but the complexity of determining appropriate interrupt time increases
Solution Approach 1:
The patent applies parameter changes by adjusting the interrupt time value based on the combination of subcarrier spacings and frequency ranges between source and destination cells. Different interrupt time values are selected according to the specific handover scenario (intra-frequency, inter-frequency, FR1-to-FR2, etc.), allowing the system to adapt to various 5G handover conditions while managing complexity through predefined parameter mappings.
2Reliability
If the interrupt time is extended to accommodate different subcarrier spacings and frequency ranges, then handover reliability is improved, but data transmission interruption increases
Solution Approach 1:
The patent implements dynamics by making the interrupt time adjustable rather than fixed. The handover control unit dynamically selects appropriate interrupt time values based on the specific combination of subcarrier spacings and frequency ranges involved in the handover, allowing the system to optimize between reliability and interruption time for each scenario.
Solution Approach 2:
The system changes the interrupt time parameter according to the handover scenario. For example, different interrupt time values are applied for intra-frequency handovers versus inter-frequency handovers, and for different frequency range transitions (FR1-to-FR2), thereby optimizing reliability while minimizing unnecessary interruptions.
3Productivity
If carrier aggregation is continued during handover, then throughput is maintained, but radio link monitoring complexity increases
Solution Approach 1:
The patent applies continuity of useful action by maintaining carrier aggregation during the handover process. The terminal continues to aggregate multiple component carriers and maintain radio link monitoring throughout the handover transition, ensuring that data transmission does not interrupt and throughput is maintained, while the complexity is managed through systematic monitoring of source and destination cells.
Data Source
AI summary
A terminal determines an interrupt time applied to a transition from a transition source cell to a transition destination cell. Specifically, the terminal changes a value of the interrupt time based on a combination of subcarrier spacings set in the transition source cell and the transition destination cell.