CU-DU Layer 3 Measurement ID Segmentation for Low-Latency Mobility
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Solution Overview
Problem
Current 3GPP specifications for CU and DU functional division in access networks lack flexibility in handling RRC messages, limiting real-time capabilities and coordination between CU and DU for layer 3 measurements, which impairs network performance and prevents efficient use of UE event reporting for low-latency mobility.
Innovation Solution
A method and system that configure UE to perform layer 3 measurements based on distinct measurement IDs for CU and DU, allowing each to act independently on received reports without interfering, enabling coordinated and efficient handling of RRC messages and measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the CU and DU follow the standardized functional division for handling RRC messages, then the system maintains standardized operation and interoperability, but the system lacks flexibility and real-time coordination capability for layer 3 measurements
Solution Approach 1:
The patent segments the measurement ID space into two distinct subsets: one subset for CU-configured measurements and another subset for DU-configured measurements. This segmentation allows the CU and DU to independently configure and handle measurements without interference, while maintaining overall system coordination through the standardized RRC message framework.
2Speed
If the CU handles all layer 3 measurements centrally, then centralized control is maintained, but real-time response capability and low-latency mobility support are impaired
Solution Approach 1:
The patent divides measurement handling responsibilities by creating separate measurement ID subsets for CU and DU. The DU can now directly handle measurements in its allocated subset without requiring CU intervention for each measurement event, enabling faster real-time response while maintaining centralized architecture for other functions.
Solution Approach 2:
The patent introduces a new dimension of control by allowing the DU to independently configure and act on measurements within its assigned ID subset. This adds a parallel measurement handling path that operates alongside the traditional CU-centric approach, enabling low-latency mobility support while preserving overall centralized control.
3Reliability
If the DU is given independent measurement handling capability, then real-time coordination and low-latency mobility are enabled, but interference with CU measurement actions may occur
Solution Approach 1:
The patent prevents interference between CU and DU measurement actions by segmenting the measurement ID namespace. Each entity operates on its own non-overlapping subset of measurement IDs, eliminating the possibility of conflicting actions while maintaining independent measurement handling capability for both CU and DU.
Data Source
AI summary
There is provided mechanisms for handling layer 3 measurements of a UE. A method is performed by an access network system. The access network system includes a CU and a DU. The method includes configuring the UE to perform layer 3 measurements. The UE is configured to perform layer 3 measurements according to measurement IDs. A first subset of the measurement IDs is associated with the CU and a second subset of the measurement IDs is associated with the DU. The method includes obtaining a report with a layer 3 measurement from the UE. The report has one of the measurement IDs. The method includes performing, at the CU, an action that depends on the layer 3 measurement in the report only when the measurement ID of the report is one of the measurement IDs in the first subset.