Keyless Vehicle Ranging Time Slots to Minimize UWB Interference
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Solution Overview
Problem
Existing keyless vehicle entry systems face inefficiencies due to overlapping communication and interference between multiple peripheral wireless devices and a central wireless device, leading to extended time for detection and vehicle access, especially in scenarios with overlapping wireless personal area networks.
Innovation Solution
A method involving a central wireless device broadcasting ranging measurement messages to multiple peripheral wireless devices, with coordinated responses in non-overlapping time slots, and using ultra-wideband communication to minimize interference and reduce ranging time, including the selection of optimal time slots based on interference estimates and pseudo-random number generation for hopping patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If individual uncoordinated communication is used between peripheral wireless devices and the central wireless device, then each device can communicate independently, but communication overlap occurs and ranging time is extended
Solution Approach 1:
The communication process is segmented into distinct time slots within a ranging frame. Each peripheral device is assigned specific time slots for transmission, preventing overlap while maintaining independent communication capability. The ranging frame is divided into multiple non-overlapping time slots that are sequentially allocated to different devices.
Solution Approach 2:
The communication follows a periodic structure with ranging frames containing multiple time slots. Devices transmit and receive messages at regular intervals defined by the frame structure, creating a rhythmic communication pattern that eliminates overlap while preserving individual device autonomy.
2Productivity
If multiple peripheral wireless devices communicate simultaneously with the central wireless device, then communication efficiency increases, but interference between devices occurs
Solution Approach 1:
The time domain is segmented into distinct slots within each ranging frame, allowing multiple devices to communicate in sequence rather than simultaneously. This temporal segmentation maintains high communication efficiency by keeping channels busy while eliminating interference through non-overlapping transmission windows.
Solution Approach 2:
The system dynamically allocates time slots to different peripheral devices based on their communication needs and interference conditions. The slot allocation can be adjusted between ranging frames to optimize performance while preventing interference through coordinated access.
Data Source
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AI summary
Methods and apparatus to support channel access control for keyless vehicle entry systems are disclosed. An initiating central wireless device of a wireless personal area network (WPAN) queries multiple responding peripheral wireless devices to perform ranging for distance and/or angle of arrival data, where the multiple peripheral wireless devices coordinate responses to minimize interference, avoid overlapping transmissions, and reduce time to complete ranging. Ranging frames are divided into multiple ranging time slots, where each ranging time slot can accommodate a full ranging cycle between the central and peripheral wireless devices. The central wireless device determines which ranging time slot to use based on estimates of communication channel interference and on a number of received responses from the peripheral wireless devices. Ranging measurements are provided to a controller of a vehicle that houses the peripheral wireless devices to determine whether to permit vehicle access.