Reference Signal Scheduling for Low-Latency UE Mobility Measurements
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Solution Overview
Problem
Conventional wireless communication networks face challenges in performing mobility procedures at Layer 3 (L3) with interruptions and limited flexibility in Layer 1 (L1) and Layer 2 (L2) mobility, particularly in configuring intra-frequency and inter-frequency measurements for user equipment (UE).
Innovation Solution
Implementing Layer 1 (L1) measurements for UE that detect overlapping reference signals from non-serving cells, allowing for prioritized measurements based on context and using beam failure detection (BFD) reference signals implicitly, enhancing L1/L2 mobility with reduced signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional L1 measurements are used for mobility procedures, then measurement capability is provided, but mobility latency increases and handover interruptions occur
Solution Approach 1:
The patent applies preliminary action by configuring the UE to perform L1 measurements of neighboring cells in advance before actual handover is needed. The network entity configures measurement objects and the UE performs measurements during available time windows, preparing measurement results beforehand. This allows faster handover execution when needed, reducing mobility latency while maintaining reliability through pre-configured measurement capabilities.
2Adaptability or versatility
If flexible measurement configuration is implemented, then measurement adaptability improves, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the measurement configuration into distinct components: measurement objects (identifying target cells), measurement configurations (parameter settings), and measurement gaps (time window definitions). The network entity configures these as separate, manageable elements that can be independently adjusted. This structured segmentation enables flexible adaptation to different measurement scenarios while keeping the configuration process organized and manageable.
Solution Approach 2:
The patent implements dynamics through configurable measurement gaps and time windows that can be dynamically adjusted based on network conditions and mobility needs. The measurement configuration allows flexible timing parameters that can be modified to optimize measurement performance under varying conditions, enabling the system to adapt to different operational scenarios while managing complexity through parameterization.
3Productivity
If L1 measurements of non-serving cells are performed, then handover preparation improves, but measurement conflicts with serving cell signals occur
Solution Approach 1:
The patent applies periodic action by implementing measurement gaps that create dedicated time windows for measuring non-serving cells. During these gaps, the UE can perform measurements without being interfered by serving cell signals. The periodic nature of these gaps allows the UE to alternate between serving cell reception and neighboring cell measurement, enabling efficient handover preparation while minimizing measurement conflicts through time-division multiplexing.
Data Source
AI summary
Aspects relate to measuring and scheduling reference signals. A user equipment (UE) detects reference signals having overlapping resources, and determines a context associated with the reference signals. A Layer 1 (L1) measurement is then performed of at least one reference signal according to a prioritization associated with the context. In another aspect, a network entity determines a scheduling of resources that enables a UE to prioritize performing an L1 measurement of a reference signal from a non-serving cell, and communicates with the UE according to the scheduling. In yet another aspect, a UE communicates with a gNb using transmission configuration indication (TCI) states associated with a corresponding control resource set (CORESET) pool of CORESETs. Beam failure detection (BFD) reference signals are then identified explicitly via a configuration signaling, or implicitly based on the TCI states. The BFD reference signals are then monitored to facilitate detecting a beam failure event.