Wireless Device Interface Selection for V2X Positioning
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Solution Overview
Problem
Existing wireless communication networks face challenges in providing accurate positioning information for vehicle-to-everything (V2X) services when vehicles or vulnerable road users are out of cellular and Global Navigation Satellite System (GNSS) coverage, leading to difficulties in offering positioning-dependent services.
Innovation Solution
The method involves determining the wireless device (WD) positioning information status and cellular coverage status to select an appropriate communication interface, allowing for graceful degradation of services by switching to Device-to-Device (D2D) communications when cellular assistance is not available, using a configuration that specifies how to determine these statuses and select the communication interface based on predefined states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cellular-network-assisted D2D communications are used to improve positioning accuracy, then positioning precision is improved, but device complexity increases due to interface selection management
Solution Approach 1:
The wireless device autonomously determines its own state (coverage status and positioning information status) and selects the appropriate communication interface without external assistance. The device self-manages the interface selection by evaluating its current state and transitioning between states independently, reducing the need for complex network-assisted interface management while maintaining positioning accuracy through autonomous decision-making
Solution Approach 2:
The communication interface is dynamically selected based on the device's current state, which can transition between four states (State 1-4) depending on coverage and positioning information status. The system adapts the interface selection in real-time as the device moves between states, allowing flexible switching between cellular and D2D interfaces based on current operational conditions rather than static configuration
2Adaptability or versatility
If interface selection is managed autonomously by WD to reduce network complexity, then device autonomy is improved, but reliability decreases when WD lacks positioning information
Solution Approach 1:
The system prepares for potential positioning information loss by establishing a fallback mechanism. When the device transitions to State 3 or State 4 (out of coverage or lacking positioning information), it switches to D2D communication mode that can operate with relative positioning or without absolute positioning requirements. This pre-established alternative ensures service continuity and reliability even when autonomous operation without positioning information is needed
Solution Approach 2:
The state machine acts as an intermediary between the device's autonomous interface selection capability and the reliability requirement. By introducing structured state transitions (State 1-4) as an intermediate layer, the system mediates between autonomous operation and service reliability, ensuring that autonomy is exercised within bounds that maintain reliable service through appropriate state-dependent interface selection
3Duration of action of stationary object
If D2D communication is used to maintain services out of coverage, then service continuity is improved, but positioning accuracy deteriorates without cellular assistance
Solution Approach 1:
The positioning functionality is segmented into different modes corresponding to different states. In State 1 and State 2 (with cellular coverage), absolute positioning with high accuracy is used. In State 3 and State 4 (out of coverage), the system segments the positioning requirement into relative positioning between D2D devices, which provides sufficient accuracy for maintaining service continuity without requiring cellular assistance. This segmentation allows service continuity while accepting reduced positioning precision in D2D mode
Solution Approach 2:
The system changes the positioning parameter requirements based on the operational state. When transitioning from cellular-assisted mode (State 1-2) to D2D mode (State 3-4), the positioning accuracy parameter is adjusted from high-precision absolute positioning to lower-precision relative positioning. This parameter change enables service continuity in D2D mode with relaxed positioning requirements, trading off some accuracy for maintaining service availability
Data Source
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AI summary
A wireless device (WD) and method for a WD for selecting a communication interface is provided. The WD supports communication with a network node. The method includes determining a WD positioning information status and a cellular coverage status and determining a WD state based on the determined WD positioning information status and the cellular coverage status. The method further includes transmitting a position information based on the determined WD state and selecting a communication interface based at least in part on the determined WD state. A network node and methods for the network node are also provided.