Conditional Handover Cell Selection Using Bandwidth and Subcarrier Spacing
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Solution Overview
Problem
The existing handover process in wireless communication networks often selects target cells based solely on reference signal received power (RSRP), leading to suboptimal selections that can affect user experience, especially during high throughput requirements such as ongoing data sessions.
Innovation Solution
The user equipment (UE) selects a target cell for conditional handover by considering a combination of factors including bandwidth, subcarrier spacing, and RSRP, rather than relying solely on RSRP, to optimize the selection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If target cell selection is based solely on RSRP, then the handover process is simple and fast, but the selection may be suboptimal and affect user experience during high throughput requirements
Solution Approach 1:
The patent changes the parameters used for cell selection from solely RSRP to a combination of RSRP, bandwidth, and subcarrier spacing. This allows the system to evaluate multiple dimensions of cell performance simultaneously, enabling optimal cell selection for high throughput requirements while maintaining manageable complexity through structured evaluation criteria.
Solution Approach 2:
The patent adds new dimensions to the cell selection process by incorporating bandwidth and subcarrier spacing alongside the traditional RSRP metric. This multi-dimensional approach enables the system to assess cells based on their actual capacity to support high throughput data sessions, rather than relying on a single signal strength parameter.
2Productivity
If multiple factors (bandwidth, subcarrier spacing, RSRP) are considered for cell selection, then throughput and user performance are enhanced, but the selection process becomes more complex
Solution Approach 1:
The patent performs preliminary measurements and evaluations of bandwidth, subcarrier spacing, and RSRP for candidate cells before final handover decision is made. This advance preparation allows the system to pre-rank candidate cells based on their suitability for high throughput requirements, making the overall selection process more systematic and manageable despite the multiple factors involved.
3Ease of operation
If handover is triggered based on RSRP thresholds (Event A3/A5), then the handover timing is straightforward, but the selected cell may not meet bandwidth requirements for ongoing data sessions
Solution Approach 1:
The patent makes the handover triggering mechanism dynamic by continuously evaluating multiple parameters (RSRP, bandwidth, subcarrier spacing) rather than relying on fixed RSRP thresholds. This dynamic approach allows the system to adapt cell selection decisions to the actual requirements of ongoing data sessions, ensuring that handover is triggered at the optimal moment when a suitable cell becomes available.
Data Source
AI summary
Disclosed are methods, systems, and computer-readable medium to perform operations including: receiving, from a source base station, a configuration message for conditional handover, the configuration message comprising respective bandwidths and subcarrier spacings corresponding to respective a plurality of candidate cells; measuring reference signal received power (RSRP) for each of the plurality of candidate cells; selecting a target cell from the plurality of candidate cells for conditional handover based on one or more of the bandwidth, the subcarrier spacing, or the RSRP; and performing conditional handover with a base station in the target cell.