Distributed Base Station PRS Processing Window Configuration
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Solution Overview
Problem
Existing technologies are unclear on how to configure and activate preconfigured Positioning Reference Signal (PRS) processing windows (PPWs) in distributed base stations, and how to deactivate and release them effectively.
Innovation Solution
A method for managing PRS processing windows is implemented in a central unit (CU) of a distributed base station, involving providing a PPW configuration to a user equipment (UE) via a distributed unit (DU) and transmitting activation or deactivation requests to the DU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preconfigured PPW procedures are implemented in distributed base stations, then positioning measurement capability is improved, but system complexity and operational clarity are worsened due to lack of defined configuration and activation mechanisms
Solution Approach 1:
The base station is segmented into central unit (CU) and distributed unit (DU) with clear functional separation. The CU handles high-level positioning measurement configuration and activation decisions, while the DU handles specific PPW configuration transmission and activation command generation. This segmentation resolves the complexity by distributing responsibilities across modular components with well-defined interfaces.
Solution Approach 2:
The central unit acts as an intermediary between the location management function and the distributed unit. It receives positioning measurement configuration requests, processes them, and generates appropriate RRC messages for the DU to transmit to the UE. This intermediary role simplifies the overall system by providing a centralized coordination point for PPW management.
2Reliability
If PPW configuration is transmitted through RRC reconfiguration messages, then configuration reliability is improved, but message overhead and processing time are increased
Solution Approach 1:
The PPW configuration is pre-configured in the UE through RRC reconfiguration messages before actual positioning measurements are needed. This preliminary configuration allows the UE to have the necessary parameters ready, and only requires activation later when positioning measurements are required, reducing the time needed at the moment of actual measurement.
Solution Approach 2:
The system dynamically activates or deactivates PPW configurations based on current positioning requirements. The CU can activate specific pre-configured PPWs when needed and deactivate them when not needed, allowing flexible resource management. This dynamic approach balances reliability of configuration with efficient use of time and resources.
Data Source
AI summary
To manage a positioning reference signal (PRS) processing window (PPW) at a user equipment (UE), a central unit (CU) of a distributed base station that also includes a distributed unit (DU) provides (512), to the CE via the DU, a PPW configuration; and transmits (514), to the DU, a request to activate or deactivate the PPW configuration for the UE.