Disaggregated Base Station Measurement Reporting via F1 Interface
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Solution Overview
Problem
In 5G New Radio wireless communication networks, there is a need for efficient measurement and event reporting mechanisms between central units (CU) and distributed units (DU) in disaggregated base stations to optimize network performance and mobility management.
Innovation Solution
The implementation of a method where the CU configures the DU with measurement and reporting configurations, allowing for periodic or event-triggered measurement reports to be sent from the DU to the CU, including parameters such as RACH reports, uplink measurements, and RLC protocol measurements, via the F1 interface, enhancing the F1 Application Protocol (F1-AP) for measurement and event reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement and reporting configurations are implemented between CU and DU in disaggregated base stations, then network performance and mobility management are optimized, but the complexity of the F1 interface protocol increases
Solution Approach 1:
The measurement and reporting configuration is segmented into distinct components: measurement configuration (defining what to measure), reporting configuration (defining how to report), and measurement triggers (defining when to report). This segmentation allows the CU and DU to independently manage different aspects of the measurement process, reducing overall system complexity while maintaining optimized network performance.
Solution Approach 2:
The CU performs preliminary actions by pre-configuring the DU with measurement configurations and reporting configurations before actual measurements begin. This includes setting up measurement parameters, thresholds, and reporting formats in advance, which streamlines the subsequent measurement and reporting process and reduces real-time processing complexity.
2Ease of operation
If periodic or event-triggered measurement reports are sent from DU to CU, then mobility management is improved, but the signaling overhead on the F1 interface increases
Solution Approach 1:
The reporting mechanism dynamically adapts between periodic reporting and event-triggered reporting based on network conditions and mobility requirements. When mobility events occur (such as handover conditions), event-triggered reporting provides timely updates. During stable conditions, periodic reporting maintains connectivity with reduced overhead, optimizing the balance between mobility management quality and signaling load.
Solution Approach 2:
The system changes reporting parameters (such as reporting intervals, thresholds, and formats) based on network conditions and event types. This allows the DU to adjust the frequency and content of reports dynamically, ensuring adequate mobility management information is provided while minimizing unnecessary signaling overhead during periods of stability.
3Measurement precision
If comprehensive measurement data including RACH reports, uplink measurements, and RLC protocol measurements are collected, then network optimization is enhanced, but the processing load at the CU increases
Solution Approach 1:
Specific measurement data elements are extracted and processed at the DU level before being reported to the CU. The DU filters and prepares measurement results (such as RACH reports, uplink measurements, and RLC protocol measurements) by removing redundant information and focusing on key performance indicators, thereby reducing the processing load at the CU while maintaining comprehensive network optimization capabilities.
Solution Approach 2:
The system implements partial processing of measurement data at the DU level, performing local analysis and filtering to extract only the most relevant information for CU processing. This partial action approach ensures comprehensive measurement coverage without overwhelming the CU with excessive raw data, optimizing the distribution of processing loads across the disaggregated base station architecture.
Data Source
AI summary
Aspects relate to measurement and event reporting from a distributed unit (DU) of a disaggregated base station to a central unit (CU) of the disaggregated base station. The CU can configure the DU with a measurement configuration associated with at least one value to be obtained by the DU and a reporting configuration for reporting the at least one value to the CU. The measurement reports can be sent by DU periodically or the measurement reports can be event-triggered based on the reporting configuration. In addition, the measurement reports can be UE-specific or DU/cell-specific. The measurement reports may include random access channel (RACH) reports, uplink measurement reports, radio link protocol (RLC) reports, medium access control (MAC) protocol reports, and other types of measurement or event-based reports.