WTRU Multiple Frequency Layers Positioning
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Solution Overview
Problem
Conventional wireless networks limit WTRUs to processing only one frequency layer for positioning, which restricts the accuracy and flexibility of positioning services, especially in applications requiring high accuracy such as factory deployments and vehicle communications.
Innovation Solution
A WTRU is configured to enable multiple frequency layers for positioning, with triggers such as SCell activation/deactivation status, bandwidth part activation, and measurement quality of positioning reference signals (PRS) being used to dynamically switch and aggregate frequency layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional WTRU processes only one frequency layer for positioning, then the device complexity is reduced, but the positioning accuracy and measurement precision deteriorate
Solution Approach 1:
The WTRU dynamically enables or disables frequency layers based on triggering conditions such as SCell activation/deactivation status, bandwidth part activation, and measurement quality thresholds. This dynamic approach allows the system to process multiple frequency layers when needed for high accuracy positioning while reducing to single frequency layer processing under normal conditions, thus resolving the contradiction between positioning accuracy and device complexity
Solution Approach 2:
The system changes the operational parameter of frequency layer quantity from a fixed single layer to a variable number of layers (up to four frequency layers) based on positioning requirements. By adjusting this parameter dynamically according to triggering conditions, the system achieves high positioning accuracy when necessary while maintaining low complexity during routine operations
2Measurement precision
If a WTRU is configured to operate with up to four frequency layers, then the positioning accuracy is improved, but the ease of operation deteriorates due to complex trigger conditions and measurement management
Solution Approach 1:
The WTRU autonomously manages frequency layer activation and deactivation based on pre-configured triggering conditions without requiring continuous network control. The device self-evaluates measurement quality against thresholds, self-determines when to enable additional frequency layers, and self-manages the positioning measurement process, thereby improving positioning accuracy while simplifying operational management
Solution Approach 2:
The system implements feedback mechanisms where measurement quality of positioning reference signals is continuously monitored and compared against thresholds. This feedback drives automatic triggering of frequency layer enablement or disablement, creating a self-regulating system that maintains high positioning accuracy while reducing manual intervention and simplifying operation through automated decision-making
3Reliability
If multiple frequency layers are enabled for positioning, then the positioning service quality is improved, but the use of energy increases due to additional processing requirements
Solution Approach 1:
The WTRU dynamically adjusts the number of active frequency layers based on real-time positioning requirements and triggering conditions. Instead of continuously processing multiple frequency layers, the system activates additional layers only when positioning accuracy requirements demand it, thereby maintaining high positioning service quality when needed while reducing energy consumption during normal operations
Solution Approach 2:
The system applies partial action by processing only the necessary number of frequency layers required for the current positioning task. Rather than always enabling all four configured frequency layers, the WTRU enables exactly the number of layers needed based on measurement quality thresholds and positioning service requirements, optimizing the balance between positioning reliability and energy consumption
Data Source
AI summary
A method for a Wireless Transmit/Receive Unit (WTRU). The method including receiving from a network configuration information indicating multiple frequency layers for positioning reference signals; and at least one activated frequency layer from among the multiple frequency layers. The frequency layers may be associated with one or more carriers for data transmission, wherein the carrier is co-located with its associated frequency layer for positioning; and bandwidth parts (BWPs) within carriers for data transmission. The WTRU may receive from the network activation/deactivation information indicating activation/deactivation of any of a secondary cell (SCell) and a BWP. The WTRU may transmit information indicating, for example, a set of frequency layers used for positioning, wherein the set of frequency layers is enabled according to any of an accuracy requirement, a latency, a measured RSRP of one frequency layer, and a measured CSI-RS corresponding to BWPs being a threshold.