PC5 V2X Radio Resource Selection Without GPS Coverage
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Solution Overview
Problem
Current V2X communication technologies via PC5 interface struggle to establish connections when user equipment (UE) is outside network coverage, as they rely on GPS/GNSS for geographic location determination, which is unavailable in such scenarios, leading to incorrect resource selection and communication failure.
Innovation Solution
UEs employ periodic location recording and estimation based on travel route, travel time, and velocity when GPS/GNSS is unavailable, allowing them to determine appropriate radio resources for V2X communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If V2X communication relies on GPS/GNSS for geographic location determination, then location accuracy is improved, but reliability deteriorates when GPS/GNSS signal coverage is lost
Solution Approach 1:
The system performs preliminary actions by recording geographic locations periodically along the travel route while GPS coverage is available. These pre-recorded location data are stored for later use when GPS coverage is lost, enabling the UE to determine appropriate radio resources without real-time GPS signals.
Solution Approach 2:
The patent introduces an intermediary estimation mechanism that bridges the gap between GPS availability and communication needs. When GPS coverage is lost, the system uses the pre-recorded location data combined with travel route information, travel time, and velocity to estimate current geographic location, thereby maintaining communication reliability without direct GPS input.
2Measurement precision
If V2X communication uses network-based location determination, then location accuracy is improved, but adaptability deteriorates in areas without network infrastructure
Solution Approach 1:
The system extracts the location determination function from dependence on external network infrastructure. By using pre-recorded geographic location data stored in the UE combined with local travel route information, the system enables V2X communication to operate independently of network coverage, thereby improving adaptability to remote or infrastructure-less areas.
Solution Approach 2:
The UE performs self-service by maintaining its own location records and using them to determine radio resources. The system uses its stored travel route data, travel time, and velocity information to estimate location without requiring external network assistance, enabling autonomous operation in areas without network infrastructure.
3Measurement precision
If V2X communication requires real-time GPS coverage, then location determination accuracy is improved, but device complexity increases to handle signal loss scenarios
Solution Approach 1:
The system simplifies the overall architecture by performing preliminary location recording during periods of GPS availability. This pre-caching of location data eliminates the need for complex real-time decision-making systems to handle signal loss, reducing device complexity while maintaining the ability to provide accurate location-based radio resource selection.
Data Source
AI summary
Techniques, described herein, may enable a vehicle to engage in vehicle-to-everything (V2X) communications via PC5 sidelink (SL), even when the vehicle does not have a global positioning system (GPS) or other type of satellite signal. While receiving a satellite signal, the vehicle may pre-store future geographic locations based on a travel route and upon detecting a loss of the satellite signal, the vehicle may estimate a geographic location of the UE based on one or more types of information, such as mapping or navigation capabilities of the UE, a travel time since the signal failure or last estimated geographic location, a travel velocity since the signal failure or last estimated geographic location, etc. The vehicle may determine, based on an estimated geographic location, that physical resources are appropriate for SL communication and begin using the physical resources accordingly.