WTRU SRSp Configuration for Low Power High Accuracy Positioning
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Solution Overview
Problem
Existing mobile communication systems face challenges in achieving low power high accuracy positioning (LPHAP) while minimizing power consumption and signaling overhead, especially in low power operation modes.
Innovation Solution
The system configures a wireless transmit/receive unit (WTRU) to receive configuration information for different sounding reference signal for positioning (SRSp) configurations associated with specific positioning areas, allowing the WTRU to dynamically switch between these configurations to optimize positioning accuracy and power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the WTRU transmits SRSp signals continuously to maintain positioning accuracy, then positioning precision is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic SRSp transmission by configuring the WTRU to transmit sounding reference signals at specific intervals rather than continuously. The network controls the transmission timing through RRC reconfiguration messages, enabling the WTRU to maintain positioning capability while reducing power consumption through scheduled, periodic operations.
Solution Approach 2:
The patent dynamically adjusts SRSp transmission configurations based on the WTRU's operational state and positioning needs. The network can activate or deactivate SRSp transmission through RRC reconfiguration messages, allowing the system to adapt between high-accuracy positioning mode and power-saving mode according to real-time requirements.
2Adaptability or versatility
If the network provides multiple SRSp configurations for different positioning areas, then positioning adaptability is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the service area into multiple positioning areas, each associated with specific SRSp configurations. The network provides configuration information for different positioning areas through RRC reconfiguration messages, allowing the WTRU to select appropriate configurations based on its current location without requiring all configurations to be actively transmitted simultaneously.
Solution Approach 2:
The network pre-configures multiple SRSp configurations for different positioning areas before the WTRU needs to transition between areas. Configuration information is provided in advance through RRC reconfiguration messages, so when the WTRU moves to a different positioning area, the appropriate SRSp configuration is already ready and can be activated without additional signaling delays.
Data Source
AI summary
Systems, methods, and instrumentalities are described herein for supporting low power high accuracy positioning (LPHAP). A wireless transmit/receive unit (WTRU) may receive configuration information (e.g., in a radio resource control (RRC) reconfiguration message) from a first cell. The configuration information may indicate a first sounding reference for positioning (SRSp) configuration and a second SRSp configuration. The first SRSp configuration may be associated with a first positioning area and the second SRSp configuration may be associated with a second positioning area. The first positioning area may include a first cell ID set and the second positioning area may include a second cell ID set. The first SRSp configuration may be activated and the second SRSp configuration may be deactivated.