Assisted-GNSS Broadcasts for Fast Non-Terrestrial Network Access
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Solution Overview
Problem
Devices connecting to non-geostationary orbit satellite networks face delays in acquiring GNSS data due to the need to compensate for timing and frequency relativity effects, which can reduce device longevity and hinder fast connection to satellite networks.
Innovation Solution
A method in a network node provides compact Assisted-GNSS information in system information, identifying relevant GNSS satellites for a specific area and transmitting this data to devices, allowing them to determine their location and compensate for Doppler and frequency offsets for faster network connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If devices continuously monitor GNSS satellites to acquire location data for connection to NTN, then positioning accuracy is improved, but device battery longevity deteriorates
Solution Approach 1:
The network node performs preliminary action by providing A-GNSS information in advance through system information broadcasts. This allows devices to obtain necessary GNSS data (almanac, ephemeris, timing information) before they need to establish connection to the NTN, eliminating the need for continuous monitoring and extending battery life while maintaining positioning accuracy.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network node acts as a mediator between GNSS satellites and devices. Instead of devices directly and continuously monitoring GNSS satellites, the network node provides processed A-GNSS information, reducing device power consumption while maintaining positioning capability.
2Speed
If devices continuously monitor GNSS satellites to acquire location data for connection to NTN, then connection speed to satellite network is improved, but device battery longevity deteriorates
Solution Approach 1:
The network node provides A-GNSS information in advance through system information, enabling devices to quickly determine their location and calculate Doppler offsets before connection is needed. This preliminary provision of data accelerates the connection process without requiring continuous GNSS monitoring, thus extending battery life.
3Speed
If network nodes provide comprehensive GNSS data in system information, then device connection speed is improved, but system information size increases
Solution Approach 1:
The patent extracts only the essential A-GNSS information needed for device connection (almanac, ephemeris, timing data for relevant GNSS satellites) and provides this targeted subset in system information. This extraction approach avoids transmitting unnecessary comprehensive GNSS data, keeping system information size manageable while enabling fast device connection.
Solution Approach 2:
The network node determines which GNSS satellites are relevant for a specific area and provides A-GNSS information only for those satellites. This local quality approach tailors the system information to the specific operational context, reducing overall data volume while maintaining connection speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces connection latency and power consumption by enabling devices to quickly acquire GNSS data and connect to satellite networks efficiently.
Implementation Method 1
compensate for Doppler and frequency offsets for faster network connection
Data Source
AI summary
According to certain embodiments, a method performed by a wireless device comprises receiving Assisted-Global Navigation Satellite System (A-GNSS) information in system information broadcast by a network, receiving signals from a set of GNSS satellites (the set of GNSS satellites comprises at least three GNSS satellites), and determining a location of the wireless device using the A-GNSS information and information received in the signals from the set of GNSS satellites. The method further comprises determining Doppler time and frequency offsets compared to a network satellite. The Doppler time and frequency offsets are determined based on the location of the wireless device. The method further comprises initiating a connection process with the network satellite by transmitting a random access signal with pre-compensated time and frequency, the pre-compensated time and frequency based on the determined Doppler time and frequency offsets.