Mobility Reporting With Event-Driven Beam Feedback for Faster Handover
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Solution Overview
Problem
Existing wireless communication technologies face challenges in maintaining seamless connectivity during user movement due to signal degradation in high-frequency beamforming, leading to potential handover failures, especially in NR networks, which can be addressed by enhancing mobility management through Layer 1/Layer 2 triggered mobility (LTM) and MIMO beam management.
Innovation Solution
Implementing Layer 1/Layer 2 triggered mobility (LTM) procedures, including early synchronization and timing advance acquisition for candidate cells, and WTRU-initiated/event-driven beam reporting to facilitate faster handovers and reduce latency, along with MIMO enhancements for efficient beam management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used in NR networks with high-frequency beamforming, then network coverage can be maintained, but signal degradation occurs during user movement leading to handover failures
Solution Approach 1:
The patent implements Layer 1/Layer 2 triggered mobility (LTM) procedures where the WTRU performs early synchronization and timing advance acquisition for candidate cells before handover is triggered. This preliminary action ensures that the target cell is already synchronized and ready to receive the handover, eliminating signal degradation issues during the handover execution phase.
Solution Approach 2:
The patent implements WTRU-initiated/event-driven beam reporting where the WTRU continuously monitors beam quality metrics and provides feedback reports to the network. This feedback mechanism enables the network to detect signal degradation early and trigger handover procedures proactively, preventing handover failures before they occur.
2Loss of time
If faster handover procedures are implemented to reduce latency, then user experience improves, but the complexity of mobility management procedures increases
Solution Approach 1:
The patent extracts the synchronization and timing advance acquisition steps from the traditional handover procedure and performs them in advance as part of LTM configuration. By separating these time-consuming operations from the critical handover execution path, the patent reduces handover latency without significantly increasing the complexity of the core mobility management logic.
Solution Approach 2:
The patent enables WTRU-initiated beam reporting where the WTRU autonomously monitors beam quality and triggers reporting based on event-driven conditions. This self-service approach reduces the burden on network-controlled mobility management, allowing faster handovers while keeping the overall system complexity manageable through standardized event thresholds and reporting mechanisms.
Data Source
AI summary
Procedures, methods, architectures, apparatuses, systems, devices, and computer program products for reporting of measurement events in a wireless communication network. A wireless transmit-receive unit may receive configuration information for reporting different types of measurement events. It may determine to report a first type of measurement event in a specific report of a first type but may lack uplink resources to do so. It may have resources to transmit a second type of report. It may send an indication of the first type of measurement event using the resources for transmitting the second type of report and include an indication that resources for transmitting the report of the first type are requested. Having received resource availability confirmation, it transmits the first type report with measurement results of the first type. This allows the WTRU to efficiently manage and report various measurement events based on resource availability and type of report required.