LTM Handover Side Information for Selective Early Sync
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Solution Overview
Problem
The complexity and computational burden on user equipment (UE) in performing early-sync with multiple candidate cells during low layer triggered mobility (LTM) in 5G networks, particularly in high-frequency bands, hinder efficient handover processes.
Innovation Solution
Implementing a UE with an intelligent mobility module that utilizes side information such as location, traffic type, and radio access technology to selectively perform early-sync with candidate cells, reducing unnecessary computational burden and optimizing handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs early-sync with multiple candidate cells during LTM handover, then the handover reliability is improved, but the computational burden and complexity on the UE increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of candidate cells based on their proximity to the UE's current location. Cells are categorized as likely target cells (nearby) or unlikely target cells (far away), and early-sync is selectively performed only on likely target cells. This localized approach maintains handover reliability for relevant cells while significantly reducing computational burden by excluding irrelevant distant cells from the early-sync process.
Solution Approach 2:
The patent segments the set of candidate cells into two distinct groups: likely target cells and unlikely target cells. This segmentation is achieved by dividing candidate cells based on their distance from the UE's current location, allowing the UE to apply different processing strategies to each segment. The segmentation enables selective early-sync on only the necessary segment (likely target cells), thereby reducing overall computational complexity while maintaining reliability for critical handovers.
2Speed
If the UE performs early-sync with all candidate cells, then the handover speed is improved, but the processing time and energy consumption increase
Solution Approach 1:
The patent applies local quality by focusing early-sync operations only on candidate cells that are locally relevant (nearby cells likely to be target cells). This localized approach maintains fast handover for the most probable target cells while avoiding unnecessary processing time on distant cells that are unlikely to be targets, thereby optimizing the trade-off between handover speed and processing time.
Solution Approach 2:
The patent applies partial action by performing early-sync only on a subset of candidate cells (likely target cells) rather than all candidate cells. This partial approach is sufficient to achieve fast handover for the actual target cell while avoiding the excessive processing time and energy consumption that would result from synchronizing with all candidate cells, including those that are unlikely to be targets.
3Productivity
If the UE uses side information for cell selection, then the handover efficiency is improved, but the measurement and detection complexity increases
Solution Approach 1:
The patent applies self-service by utilizing side information that is already available at the UE (such as location data, traffic type, and RAT information) without requiring additional complex measurements or external assistance. The UE leverages its existing resources and pre-collected data to make intelligent handover decisions, improving efficiency while avoiding the need for complex additional detection and measurement systems.
Data Source
AI summary
A user equipment (UE) includes a transceiver configured to receive a configuration message including a plurality of candidate cells for low layer triggered mobility (LTM) handover (HO). The UE further includes a processor operatively coupled to the transceiver. The processor is configured to determine, based on side information and the plurality of candidate cells, a plurality of cells for performing early-sync, and perform early-sync with the determined plurality of cells for performing early-sync. The transceiver is further configured to receive a message including a command to perform an LTM HO to a target cell. The processer is further configured to perform the LTM HO to the target cell, and update the side information based on the LTM HO.