Mobility Beam Event Reporting for Low-Latency Inter-Cell Handover
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in tracking beam-based mobility events due to reliance on higher-layer signaling, leading to latency issues during inter-cell handovers, particularly in beam-based deployments like FR2.
Innovation Solution
Implementing methods for mobility beam management using MAC-CE commands to configure UEs with mobility beam-based events and enable reporting without invoking higher-layer signaling, utilizing L1/L2 signaling for efficient beam-based event tracking and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher-layer signaling (L3-based signaling) is used for mobility management, then comprehensive configuration and control can be achieved, but latency increases during inter-cell handovers
Solution Approach 1:
The patent segments mobility management into two parts: L3-based signaling for comprehensive configuration and control, and L1/L2-based signaling for fast event tracking and reporting. This segmentation allows each layer to handle appropriate tasks, reducing overall latency while maintaining reliability.
Solution Approach 2:
The patent implements preliminary action by configuring UEs with mobility beam-based events and L1/L2 reporting mechanisms in advance through L3 signaling. This preparation enables faster response during actual handover events without requiring higher-layer signaling at the moment of transition.
2Measurement precision
If L3-based signaling is used for beam measurement and reporting configuration, then accurate tracking is achieved, but the system complexity and signaling overhead increase
Solution Approach 1:
The patent divides measurement and reporting functions into separate L1/L2 and L3 layers. L1/L2 handles fast beam measurement and event reporting with simplified signaling, while L3 provides comprehensive configuration. This reduces overall signaling complexity while maintaining measurement precision.
Solution Approach 2:
The patent introduces L1/L2 signaling as an intermediary between the physical layer beam measurements and the L3 layer mobility management. This intermediary enables efficient event tracking and reporting without requiring direct L3 involvement for every beam event, reducing signaling overhead.
3Adaptability or versatility
If traditional cell-based event tracking is used, then compatibility with existing systems is maintained, but performance deteriorates in beam-based deployments
Solution Approach 1:
The patent implements universality by designing mobility beam-based events that can operate in both traditional cell-based and modern beam-based deployments. The L3-based configuration and L1/L2-based reporting framework provides multi-functionality, adapting to different deployment scenarios while maintaining compatibility.
Solution Approach 2:
The patent applies dynamics by enabling the system to adapt its operation mode based on deployment type. In beam-based deployments, the L1/L2 fast reporting mechanism becomes active to improve performance, while maintaining backward compatibility with cell-based events for traditional deployments.
Data Source
Figure 1A~1C
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Figure 1E
AI summary
Aspects of the present disclosure introduce lower-layer, for example Layer 1 (L1) and/or Layer 2 (L2), based mobility beam management methods. One or more particular aspects disclosed herein may enable solutions for inter-cell mobility beam management. Examples of such aspects include mobility beam-based event tracking that includes functionality to indicate mobility beam events for the UE to track, default uplink (UL) resource configuration for mobility beam reporting that includes functionality to indicate default BWP/PUCCH configuration for MBM reporting, and downlink resource configuration for mobility beam measurement that enables a UE to update the UE's internal configuration using compressed resource configuration.