A-GNSS Data Distribution in Wireless Mesh Nodes
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Solution Overview
Problem
Current Global Navigation Satellite System (GNSS) positioning methods require significant time to acquire satellite data for accurate positioning, especially when starting without known user location, ephemerides, almanacs, or current time, leading to lengthy acquisition times in worst-case scenarios.
Innovation Solution
A wireless mesh communication system that enables local distribution and management of Assisted GNSS (A-GNSS) assistance data within a single radio node or obtained from an online Internet provider, reducing system load and allowing for rapid satellite acquisition by indicating availability and transmissibility of A-GNSS data on request.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If A-GNSS assistance data is downloaded from a remote server over a data connection, then positioning accuracy is improved, but system load and data distribution overhead increase significantly
Solution Approach 1:
The patent combines multiple radio nodes into a mesh network where each node can store and share A-GNSS assistance data locally. This merging of storage and computation resources across the network eliminates the need for each node to independently download data from remote servers, reducing overall system load while maintaining positioning accuracy through local data availability.
Solution Approach 2:
The patent implements copying of A-GNSS assistance data from one radio node to others within the mesh network. When one node obtains assistance data, it creates local copies that are distributed to neighboring nodes, eliminating repeated downloads from remote servers and reducing network overhead while ensuring multiple nodes have access to the same positioning data.
2Quantity of substance
If A-GNSS assistance data is obtained without local caching, then device memory requirements are reduced, but positioning acquisition time increases to tens of minutes
Solution Approach 1:
The patent applies preliminary action by having radio nodes obtain and store A-GNSS assistance data in advance before it is actually needed for positioning. Nodes proactively download and cache ephemeris and almanac data when network connectivity is available, so that when positioning is required, the data is already locally available, reducing acquisition time from tens of minutes to seconds without requiring large permanent storage.
Solution Approach 2:
The patent implements local quality by allowing each radio node to maintain its own local cache of A-GNSS assistance data tailored to its specific positioning needs. Each node can store different amounts and types of assistance data (ephemeris, almanac, time information) based on its memory capabilities and positioning requirements, optimizing the balance between memory usage and positioning speed for local conditions.
3Measurement precision
If full ephemeris and almanac data is decoded from satellite signals, then positioning accuracy is improved, but the time required increases to tens of minutes
Solution Approach 1:
The patent applies partial action by having radio nodes download pre-decoded A-GNSS assistance data from other nodes or servers, rather than decoding the full satellite navigation messages themselves. This provides sufficient data for accurate positioning without requiring the time-consuming process of receiving and decoding complete GPS navigation messages that take tens of minutes, achieving the right balance between data completeness and acquisition speed.
Data Source
AI summary
The application relates to a wireless mesh communication system (100) that comprises a plurality of radio nodes (102, 104, 106). Each of the plurality of radio nodes is configured to provide a bi-directional radio communication with other radio node (102, 104, 106) of the system and to obtain (213, 216, 224) an assisted GNSS (A-GNSS) assistance data used in a global navigation satellite system (GNSS) positioning. Also, at least one (102, 104) of the radio nodes indicates (230) to other radio nodes (102, 104, 106) of the system that the A-GNSS assistance data is available and transmissible on request, if the at least one of the radio nodes has this A-GNSS assistance data.