Hybrid L1/L2 Mobility Reporting for Reduced Handover Overhead
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing data interruption and processing delays during Layer 3 triggered mobility due to high radio resource control signaling and synchronization overheads, especially in maintaining downlink and uplink synchronization for multiple Layer 1/Layer 2 triggered mobility candidate cells.
Innovation Solution
Implementing hybrid measurements and reporting techniques that allow user equipment (UE) to perform filtered measurements and transmit Layer 1 measurement reports, reducing the need for fine tuning of synchronization and beam training across multiple candidate cells, thereby decreasing processing and signaling overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE maintains both downlink synchronization and uplink synchronization for each LTM candidate cell, then the handover speed is improved, but the processing overhead and signaling overhead increase significantly
Solution Approach 1:
The patent applies preliminary action by having the UE perform downlink synchronization and measurement for multiple candidate cells in advance before the actual handover is needed. The UE maintains downlink synchronization for LTM candidate cells and performs filtered measurements, so that when handover is triggered, the UE can quickly switch to the target cell without needing to re-establish downlink synchronization. This preliminary preparation reduces the handover time while avoiding the need to maintain full uplink synchronization for all candidate cells simultaneously.
Solution Approach 2:
The patent segments the synchronization and measurement processes into two distinct parts: downlink synchronization (maintained for candidate cells) and uplink synchronization (established only when needed). It also segments the measurement process into filtered measurements (performed for candidate cells) and full L1 measurements (performed only when necessary). This segmentation allows the system to maintain handover readiness without the full overhead of maintaining complete synchronization for all candidate cells.
2Productivity
If the UE performs filtered measurements for multiple LTM candidate cells, then the handover preparation is improved, but the measurement processing load increases
Solution Approach 1:
The patent applies preliminary action by having the UE perform filtered measurements for multiple LTM candidate cells in advance. These filtered measurements are stored and can be quickly retrieved and used during handover decision-making. The UE identifies filtered measurement values for candidate cells and can transmit Layer 1 measurement reports containing these pre-computed measurements, reducing the need to perform full measurements at the moment of handover.
Solution Approach 2:
The patent applies partial action by having the UE perform only filtered measurements (a simplified version of full measurements) for candidate cells rather than full L1 measurements for all cells. This partial measurement approach provides sufficient information for handover decisions while significantly reducing the processing load compared to performing complete measurements for all candidate cells.
3Productivity
If the UE transmits Layer 1 measurement reports with filtered measurement values, then the signaling efficiency is improved, but the measurement accuracy may be compromised
Solution Approach 1:
The patent applies parameter changes by transforming full L1 measurement values into filtered measurement values through mathematical filtering operations. These filtered measurements are then transmitted in Layer 1 measurement reports. The filtering process adjusts the measurement parameters to provide sufficient accuracy for handover decisions while reducing the data size and improving signaling efficiency. The network node receives these filtered measurements and can perform additional processing if needed.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication and more particularly to hybrid measurements and reporting for Layer 1 (L1)/Layer 2 (L2) triggered mobility (LTM). Some aspects more specifically relate to a UE performing filtered measurements of one or more LTM candidate cells. In some aspects, the hybrid measurements and reporting may be associated with measurements using Layer 3 type measurements and reporting using L1 type reports for LTM. In some aspects, one or more cells, from the one or more LTM candidate cells, may be selected (for example, by the UE or by a network node) for L1 measurement or reporting associated with the filtered measurement values. In some aspects, the UE may transmit an L1 measurement report indicating L1 measurement values of the one or more cells. A network node may perform one or more operations in response to the L1 measurement values.