L1 Beam Measurement Filtering for Inter-Cell Mobility Across DUs
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Solution Overview
Problem
Existing technologies face challenges in efficiently managing lower layer mobility (LLM) due to increased signaling overhead and latency in intra-cell and inter-cell handovers, particularly in scenarios where target cells are controlled by different distributed units (DUs), leading to frequent ping-pongs and inefficient resource management.
Innovation Solution
Implementing different filtering configurations for L1 beam measurements based on whether the target cell is controlled by the same or a different DU, allowing for optimized filtering strategies that reduce ping-pong effects and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different filtering configurations are applied for intra-DU and inter-DU scenarios, then handover management efficiency is improved and ping-pong effects are reduced, but device complexity and configuration management become more complex
Solution Approach 1:
The patent applies different filtering configurations (Qc values) specifically for inter-DU handovers versus intra-DU handovers. For inter-DU handovers, a first filtering configuration with Qc=15 is used, while for intra-DU handovers, a second filtering configuration with Qc=7 is used. This local differentiation optimizes handover management for each scenario without requiring complex device logic, as the network side provides the appropriate configuration based on the handover type.
2Loss of energy
If filtering of L1 beam measurements is performed for inter-DU handovers, then signaling overhead is reduced, but measurement precision and handover decision accuracy may be affected
Solution Approach 1:
The patent changes the filtering parameter Qc based on the handover scenario. For inter-DU handovers, Qc is set to 15 (stronger filtering), while for intra-DU handovers, Qc is set to 7 (weaker filtering). This parameter adjustment reduces signaling overhead for inter-DU handovers by applying more aggressive filtering, while maintaining measurement precision for intra-DU handovers where less filtering is needed.
3Productivity
If multiple filtering configurations are maintained for different DUs, then resource management is optimized, but configuration management and synchronization become more difficult
Solution Approach 1:
The patent segments the filtering configuration into two distinct types: first filtering configuration for inter-DU handovers and second filtering configuration for intra-DU handovers. Each configuration is associated with specific target cell groups (first target cell group for inter-DU, second target cell group for intra-DU). This segmentation allows the network to manage different configurations independently for different DUs, optimizing resource management while simplifying configuration management through clear separation of concerns.
Data Source
AI summary
An apparatus may be configured to: receive two or more filtering configurations, wherein a first configuration is associated with at least one first target cell associated with a first distributed unit, wherein a second configuration is associated with at least one second target cell associated with at least one second distributed unit, wherein the first distributed unit is different from the at least one second distributed unit; select a configuration of the two or more configurations for at least one target cell based, at least partially, on a determination of whether a serving cell and the at least one target cell are controlled with a same distributed unit, wherein the serving cell is controlled with the first distributed unit; and perform filtering of a plurality of layer one measurements associated with the at least one target cell using the selected configuration.