Dynamic GNSS Measurement Windows for NTN Positioning Accuracy
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Solution Overview
Problem
Existing satellite positioning systems in non-terrestrial networks (NTNs) face challenges in accommodating varying UE measurement capabilities and channel conditions, leading to inefficiencies in GNSS measurement windows that do not account for environmental changes and UE movement, resulting in unsynchronized UL and DL transmissions.
Innovation Solution
A flexible and dynamic mechanism for configuring GNSS measurement windows based on UE measurement capability, channel status, and movement, allowing synchronized UL and DL transmissions by exchanging configuration messages between the UE and the network device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed GNSS measurement window is used in NB-IoT/eMTC terminal devices, then power consumption and complexity are reduced, but positioning accuracy deteriorates due to inability to adapt to environmental changes and UE movement
Solution Approach 1:
The patent implements dynamic measurement window configuration where the network device adjusts the GNSS measurement window parameters (time length, position, periodicity) based on UE movement status and channel conditions. This allows the system to adapt to environmental changes and maintain positioning accuracy without requiring complex fixed configurations at the terminal device.
Solution Approach 2:
The patent establishes a feedback mechanism where the terminal device reports its movement status and channel conditions to the network device, which then adjusts the measurement window configuration accordingly. This feedback loop enables adaptive positioning accuracy improvement while keeping terminal device complexity low.
2Measurement precision
If GNSS measurement window is configured to account for UE movement and channel changes, then positioning accuracy is improved, but power consumption and signaling overhead increase
Solution Approach 1:
The measurement window configuration is made dynamic rather than static, allowing the network device to adjust window parameters based on actual UE movement and channel conditions. This dynamic approach improves positioning accuracy only when necessary, reducing unnecessary power consumption at the terminal device.
Solution Approach 2:
The terminal device autonomously determines its movement status and reports only essential information to the network device, which then handles the complex configuration adjustments. This self-service approach minimizes terminal device processing and power consumption while maintaining accurate positioning.
3Device complexity
If half-duplex operation is used in NB-IoT/eMTC terminal devices, then cost and complexity are reduced, but communication efficiency deteriorates due to inability to perform UL and DL operations simultaneously
Solution Approach 1:
The patent segments the communication operations by introducing dedicated measurement windows within the half-duplex framework. During these windows, the terminal device performs GNSS measurements while the network device schedules UL/DL transmissions around these windows, effectively dividing time resources to accommodate both positioning and communication needs without requiring full-duplex capability.
Solution Approach 2:
The network device preliminarily configures measurement windows and schedules UL/DL transmissions around these windows in advance. This preliminary scheduling ensures that half-duplex terminal devices can perform positioning measurements without conflicting with communication operations, maintaining communication efficiency while enabling accurate positioning.
4Device complexity
If measurement windows are not synchronized between UL and DL transmissions, then terminal device operation is simplified, but communication reliability deteriorates
Solution Approach 1:
The terminal device provides feedback to the network device regarding its measurement window timing and status. The network device uses this feedback to synchronize UL/DL transmissions with the measurement windows, ensuring communication reliability without requiring complex synchronization at the terminal device.
Solution Approach 2:
The network device acts as an intermediary that coordinates between the terminal device's measurement windows and the UL/DL transmission scheduling. This intermediary role ensures proper synchronization and maintains communication reliability while keeping the terminal device operation simple.
Data Source
AI summary
Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of satellite positioning measurement. The method comprises: transmitting, at a first device and to a second device serving the first device, a first message for indicating a first configuration of a window for satellite positioning; and communicating with the second device based on the window determined according to the first configuration. In this way, the configuration of the window for satellite positioning can be aligned between the UE and the base station with a low signaling overhead.