Cellular Timing Advance Location Estimation
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Solution Overview
Problem
Current LTE/LTE-A cellular positioning technologies face challenges such as power-hungry implementations, vulnerability to multipath channels, high infrastructure and bandwidth requirements, and limitations in accuracy, especially in urban and indoor environments.
Innovation Solution
The method utilizes existing network timing management signals, specifically the Timing Advance (TA), to provide a position estimate for cellular devices without additional infrastructure or bandwidth, allowing for accurate location determination using a sensor device that monitors and processes TA signals from evolved NodeBs to refine the location of a target device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If A-GNSS positioning method is used, then positioning accuracy is improved, but power consumption increases and additional hardware is required
Solution Approach 1:
The system uses existing cellular network infrastructure and signals (TA messages, uplink transmissions) to provide positioning functionality without requiring additional GPS hardware or power-hungry receivers in the mobile device. The network entities perform the positioning calculations using readily available signaling resources.
Solution Approach 2:
The cellular network infrastructure is made multi-functional by using existing signaling channels (TA messages, uplink transmissions) for both their original communication purposes and for positioning measurements. This eliminates the need for separate dedicated positioning hardware and reduces power consumption.
2Measurement precision
If OTDOA positioning method is used, then positioning capability is added, but additional time-frequency resources and bandwidth are required
Solution Approach 1:
Existing time-frequency resources allocated for normal cellular communication (TA messages, uplink data transmissions) are repurposed for positioning measurements. The same signaling channels serve both communication and positioning functions, eliminating the need for dedicated positioning reference signals and additional bandwidth.
Solution Approach 2:
The system uses already-transmitted signaling messages (TA messages containing timing information, uplink transmissions from UE) for positioning purposes without requiring additional network resources or infrastructure modifications.
3Reliability
If E-CID positioning method is used, then robustness in multipath environments is improved, but database creation and maintenance costs increase
Solution Approach 1:
The system derives positioning information directly from real-time signaling exchanges (TA messages, uplink transmissions) without requiring pre-collected fingerprint databases. The positioning data is generated on-demand using existing network measurements, eliminating database creation and maintenance costs.
Solution Approach 2:
The system uses preliminary timing synchronization and TA measurements that are already performed for normal cellular operation to establish position estimates, avoiding the need for separate database creation activities.
4Measurement precision
If existing LPP positioning methods are used, then positioning functionality is provided, but additional network infrastructure and cooperation are required
Solution Approach 1:
Existing cellular network entities (eNB, UE) and their standard signaling channels are made multi-functional to provide positioning capabilities. The same infrastructure that handles communication also performs positioning measurements and calculations, eliminating the need for separate positioning infrastructure.
Solution Approach 2:
The cellular network infrastructure serves itself by using its own signaling messages and transmissions for positioning purposes. The eNB and UE use their existing communication protocols and resources to generate positioning data without requiring external positioning systems or additional network elements.
Data Source
AI summary
A device and method for determining the location of a cellular device, such as a mobile cell phone, utilizing a Timing Advance (TA) issued by one or more cellular base stations, such as an LTE or LTE-A enhanced NodeB (eNB), to the cellular device.