5G Terminal Conditional Configuration for Mobility
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Solution Overview
Problem
The existing conditional handover procedure in 5G NR systems has limitations in mobility procedures, particularly when a terminal does not perform handover to a candidate cell that fulfills the conditions, and there is no method for adding a secondary cell group using a similar procedure.
Innovation Solution
A terminal and base station system that includes a reception unit, measurement unit, and control unit to receive and measure cell quality, and initiate processing based on conditional configurations, allowing for flexible mobility procedures such as conditional handover and secondary cell group addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conditional handover procedure is introduced, then handover success probability is enhanced, but limitations occur in mobility procedures other than handover to handover candidate cell
Solution Approach 1:
The patent applies universality by enabling the terminal to perform multiple mobility procedures (conditional handover, secondary cell group addition, and measurement report transmission) through a unified conditional configuration mechanism. The measurement configuration is extended to support not only handover to candidate cells but also addition of secondary cell groups and transmission of measurement reports, making the system versatile across different mobility scenarios while maintaining the reliability benefits of conditional processing.
2Reliability
If cell A is indicated as handover candidate cell and cell B is not indicated as handover candidate cell, then conditional handover can be performed to cell A, but terminal stops processing without performing handover to cell B even if cell B fulfills the condition
Solution Approach 1:
The patent applies dynamics by making the terminal's handover decision process adaptive rather than static. Instead of being restricted to pre-indicated candidate cells only, the terminal dynamically evaluates all measured cells against the conditional configuration criteria and can initiate handover to any cell (including non-candidate cells like cell B) that fulfills the specified conditions, thereby achieving flexible and responsive mobility management.
Solution Approach 2:
The terminal performs self-service by autonomously determining which cell to handover to based on measured reception quality and conditional configurations, without being constrained by pre-designated candidate cell lists. The terminal independently evaluates all available cells and makes the decision to initiate handover to the most suitable cell that meets the configured conditions, enabling adaptive self-directed mobility behavior.
3Reliability
If conditional handover procedure is used, then handover robustness is improved, but method for adding secondary cell group using similar procedure is not available
Solution Approach 1:
The patent extends the conditional configuration mechanism to support multiple mobility procedures beyond conditional handover. Specifically, it enables conditional addition of secondary cell groups and conditional transmission of measurement reports by associating these operations with the same measurement configuration framework. This universal approach allows the system to achieve the robustness of conditional processing across diverse mobility scenarios including handover, cell group addition, and measurement reporting.
Data Source
AI summary
There is provided a terminal including: a reception unit that receives, from a base station, a measurement configuration which associates information indicating an object cell on which given processing is to be performed, with a conditional configuration indicating a condition to initiate the given processing; a measurement unit that measures reception quality of a cell; and a control unit that initiates the given processing corresponding to the conditional configuration when the measured cell is included in the object cell and the reception quality of the measured cell fulfills the condition to initiate the given processing.