Base Station Location Broadcast for Wireless Positioning
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Solution Overview
Problem
Current methods for obtaining a rough location estimate for a terminal in wireless networks incur significant signaling overhead and delay, as they require establishing a positioning session with a location server to exchange messages and obtain the estimate.
Innovation Solution
A transmitter, such as a base station, broadcasts or sends a message containing coordinate information and uncertainty information, including latitude, longitude, and height, along with horizontal and vertical location uncertainties, to receivers in the network, which can use this information as an initial location estimate for positioning and determine the need for assistance data for GNSS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a terminal establishes a positioning session with a location server to obtain a rough location estimate, then the location estimate can be obtained, but signaling overhead and additional delay are incurred
Solution Approach 1:
The base station performs preliminary action by determining its own location information in advance and including it in overhead messages that are continuously broadcast to terminals. This eliminates the need for terminals to establish positioning sessions with location servers to obtain rough location estimates, thereby reducing signaling overhead and delay while providing immediate access to base station location data for positioning calculations
2Measurement precision
If a terminal establishes a positioning session with a location server to obtain a rough location estimate, then the location estimate can be obtained, but signaling overhead is incurred
Solution Approach 1:
The base station serves itself by determining its own location information and making it available to terminals through overhead messages. This self-service approach eliminates the need for terminals to communicate with location servers to obtain base station location data, significantly reducing signaling overhead while ensuring terminals have access to necessary location information for positioning
Data Source
AI summary
Techniques for transmitting location information as an aid to location services are described. In one design, a transmitter may generate a message including coordinate information and uncertainty information for the location of the transmitter. The coordinate information may include latitude and longitude for horizontal location and possibly the height of the transmitter. The uncertainty information may include uncertainty of the horizontal location and possibly uncertainty of the height of the transmitter. The horizontal location uncertainty may be given by a radius of a circle centered at the latitude and longitude of the transmitter. The height uncertainty may be given by a deviation from the height of the transmitter. The transmitter may send the message to at least one receiver in a wireless network. The transmitter may be a base station that may broadcast the message to terminals within its coverage.