GNSS Assistance Reporting for Low-Power Reduced Capability Devices
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Solution Overview
Problem
Existing Global Navigation Satellite System (GNSS) technologies for reduced capability devices, such as IoT devices and RedCap devices, face challenges in efficiently managing GNSS assistance information (AI) reporting due to limited resources and network interworking, leading to suboptimal performance in acquiring and maintaining satellite positioning.
Innovation Solution
A wireless transmit receive unit (WTRU) is configured to receive configuration information for GNSS AI reporting, including thresholds and mobility-based adjustments, and uses different signaling methods to report GNSS validity duration and acquisition time, suspending user plane and control plane traffic when necessary, and employing MAC and RRC protocols for reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GNSS AI reporting is performed frequently to improve positioning accuracy, then positioning precision is improved, but device energy consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of reporting thresholds based on device mobility state. The network configures different distance thresholds (e.g., first threshold for high mobility, second threshold for low mobility) and time offsets based on the device's mobility state. This allows the system to adapt reporting frequency to actual needs - higher frequency when moving (needing frequent position updates) and lower frequency when stationary (reducing energy consumption), thus resolving the contradiction between positioning accuracy and energy consumption.
Solution Approach 2:
The patent changes the reporting trigger parameters (distance threshold and time offset) based on mobility state. When mobility state changes, the network reconfigures these parameters to optimize the balance between reporting frequency and energy consumption. This parameter adaptation allows the system to maintain positioning accuracy when needed while reducing unnecessary reporting to conserve energy.
2Measurement precision
If GNSS AI reporting is performed frequently to improve positioning accuracy, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the reporting mechanism by dividing devices into different mobility states (e.g., high mobility, low mobility, stationary) and applying different reporting configurations to each segment. This segmentation simplifies the overall system by providing standardized reporting rules for each category rather than requiring complex individualized configurations for each device, thus improving positioning accuracy through targeted reporting while managing device complexity through categorization.
3Speed
If the WTRU suspends user plane and control plane traffic to receive GNSS information, then GNSS acquisition speed is improved, but communication reliability deteriorates
Solution Approach 1:
The patent implements preliminary action by having the network pre-configure reporting thresholds, time offsets, and mobility state parameters before the device needs to report. The network proactively manages the suspension and resumption of traffic based on predicted needs, rather than reacting to device requests. This allows GNSS acquisition to proceed efficiently while the network maintains awareness of the device state to ensure communication reliability is restored when needed.
Solution Approach 2:
The patent implements feedback mechanisms where the device reports its mobility state and GNSS acquisition status to the network, and the network adjusts reporting configurations accordingly. This feedback loop ensures that traffic suspension for GNSS acquisition is temporary and controlled, with the network able to restore communication reliability when positioning accuracy is sufficient or when communication is urgently needed.
Data Source
AI summary
A wireless transmit receive unit (WTRU) is configured to receive configuration information for reporting Global Navigation Satellite System (GNSS) assistance information (AI). The configuration information comprises a reporting trigger threshold that is at least one of a distance threshold or a time offset threshold. The WTRU determines that the reporting trigger threshold is exceeded and reports GNSS AI. The GNSS AI comprises at least one of a GNSS validity duration or a GNSS acquisition time. The GNSS validity duration comprises an indication of a time duration associated with a validity of a GNSS acquisition, an indication of a time duration associated with expiration of the GNSS acquisition, or a WTRU location associated with the GNSS acquisition. The GNSS acquisition time comprises a time to acquire a GNSS position.