Conditional Handover Cell Selection Based on Device Conditions
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Solution Overview
Problem
Wireless communication systems face challenges in accurately selecting the best cell for handover, especially when multiple candidate cells meet conditional handover execution conditions, which can affect performance and user experience due to varying conditions such as jitter sensitivity, high speed, dual SIM operation, and uplink performance.
Innovation Solution
A wireless device evaluates and prioritizes cell candidates based on specific conditions such as jitter reduction, dual subscriber identity module dual standby, high speed, and uplink performance, selecting the most suitable cell for handover by considering characteristics like duplexing configurations, frequency band combinations, and supplementary uplink availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple candidate cells are considered for handover, then handover reliability is improved, but cell selection complexity increases
Solution Approach 1:
The patent segments the cell selection process into distinct evaluation stages: first identifying candidate cells meeting basic conditions, then applying condition-specific filtering criteria (jitter sensitivity, dual SIM status, high speed, uplink performance) to narrow down to the optimal cell. This segmentation reduces the complexity of evaluating all cells simultaneously while maintaining comprehensive assessment.
Solution Approach 2:
The patent performs preliminary evaluation of candidate cells by pre-identifying which cells meet the conditional handover execution conditions before final selection. This preliminary action filters out unsuitable cells early in the process, reducing the number of cells requiring detailed evaluation and thereby reducing overall selection complexity while improving reliability.
2Reliability
If cell selection is based on multiple device conditions, then user experience is improved, but evaluation time increases
Solution Approach 1:
The patent applies local quality by evaluating cell characteristics based on specific device conditions. Different cell attributes are evaluated based on relevant conditions: jitter-sensitive applications evaluate duplexing configurations, dual SIM devices evaluate frequency band combinations, high-speed devices evaluate cell mobility characteristics, and uplink-intensive applications evaluate supplementary uplink availability. This targeted evaluation reduces overall evaluation time by focusing only on relevant cell attributes for each device state.
Solution Approach 2:
The patent implements dynamic evaluation by adapting the cell selection criteria based on the current device state. The evaluation process dynamically adjusts which cell characteristics are prioritized based on active conditions (e.g., whether the device is currently in high-speed mode, has jitter-sensitive applications running, or is operating in dual SIM mode). This dynamic approach ensures optimal user experience while minimizing evaluation time by focusing computational resources on relevant factors.
3Adaptability or versatility
If conditional handover is triggered with multiple candidate cells, then handover options increase, but selection difficulty increases
Solution Approach 1:
The patent segments the multiple candidate cells into groups based on which device conditions they satisfy. Each cell is evaluated against the full set of device conditions (jitter sensitivity, dual SIM status, high speed, uplink performance), and cells are ranked based on how well they match the current device state. This segmentation transforms the difficult task of selecting from multiple unstructured candidates into a systematic process of evaluating cells against known device conditions.
Solution Approach 2:
The patent uses feedback from device condition monitoring to guide cell selection. The device continuously monitors its operational state (active applications, SIM status, speed, uplink/downlink ratio) and uses this feedback to prioritize candidate cells that best match the current conditions. This feedback mechanism reduces selection difficulty by providing clear criteria for ranking multiple candidate cells based on real-time device state.
Data Source
AI summary
This disclosure relates to techniques for performing conditional handover candidate cell selection in a wireless communication system. A wireless device and a cellular base station may establish a wireless link. The wireless device may receive conditional handover configuration information. The conditional handover configuration information may indicate one or more conditions for performing handover and cell candidates for the conditional handover. The wireless device may determine that multiple cell candidates meet the conditions for performing handover. A cell candidate to which to perform handover may be selected based at least in part on one or more wireless device conditions. The wireless device may perform handover to the selected cell candidate.