Implicit Location Encoding for V2P Collision Avoidance
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Solution Overview
Problem
Current vehicle-to-pedestrian (V2P) networks face challenges in efficiently encoding and transmitting location information for collision avoidance, particularly for pedestrian devices that require power-efficient and cost-effective solutions to maintain accurate location signaling without constant listening mode, which affects battery life and resource allocation.
Innovation Solution
The proposed solution involves a method where pedestrian devices use GPS coordinates to select time-frequency resources within a CV2X slot, encoding signals with sequences that implicitly convey their location, allowing receiving devices to determine their physical location without constant spectral monitoring, thus reducing power consumption and material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pedestrian devices transmit location information continuously using conventional methods, then location accuracy is maintained, but power consumption increases and battery life decreases
Solution Approach 1:
The patent implements periodic transmission of location information where pedestrian devices transmit signals at specific intervals rather than continuously. The device determines whether to transmit based on whether location information has changed since the last transmission, creating a periodic action pattern that reduces power consumption while maintaining location accuracy when needed.
Solution Approach 2:
The patent extracts only the essential location information that has changed from the complete location data set. Instead of transmitting all location data continuously, the device extracts and transmits only the changed portion of location information, reducing transmission frequency and power consumption while maintaining accuracy for relevant updates.
2Reliability
If pedestrian devices use constant listening mode to receive signals, then reception reliability is improved, but battery life is reduced
Solution Approach 1:
The patent implements periodic listening where receiving devices activate their receivers at specific intervals to detect transmission signals, rather than maintaining constant listening mode. This periodic action allows the device to miss some transmissions but recover with the next listening cycle, significantly reducing power consumption while maintaining acceptable reception reliability.
Solution Approach 2:
The patent uses preliminary action by having transmitting devices send signals at predetermined intervals and having receiving devices schedule their listening accordingly. The transmission timing is predetermined based on location change detection, allowing receiving devices to anticipate when signals may be sent and schedule their listening periods accordingly, reducing the need for constant monitoring.
3Device complexity
If multiple pedestrian devices transmit on the same time-frequency resources, then resource allocation is simplified, but transmitter collisions increase and interference occurs
Solution Approach 1:
The patent segments the time-frequency resources by dividing the transmission opportunities into different slots based on location information. Devices with different location characteristics are assigned to different time-frequency slots, creating segmentation that prevents collisions while maintaining relatively simple resource allocation rules based on location-based indexing.
Solution Approach 2:
The patent applies local quality by assigning different transmission resources to devices based on their specific location characteristics. Each device's location information determines its specific time-frequency slot, creating locally optimized resource allocation where each device uses resources appropriate to its spatial context, reducing collisions while maintaining overall system simplicity.
4Loss of time
If pedestrian devices transmit location updates frequently, then location information freshness is improved, but in-band interference increases
Solution Approach 1:
The patent extracts only the changed portion of location information for transmission. By comparing current location data with previously transmitted data, the device extracts only the differences that need to be communicated, reducing transmission frequency and thereby reducing in-band interference while maintaining information freshness for relevant updates.
Solution Approach 2:
The patent implements periodic transmission triggered by location changes rather than continuous or fixed-interval transmission. This periodic action based on actual need reduces the total number of transmissions compared to frequent fixed-interval updates, thereby reducing in-band interference while ensuring location information is updated promptly when changes occur.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A transmitting device may identify location data associated with a physical location of the transmitting device. The transmitting device may identify a time-frequency resource within a slot, the time-frequency resource corresponding to at least a portion of the location data associated with the physical location of the transmitting device. The transmitting device may generate a sequence based at least in part on the portion of the location data, or the slot, or the time-frequency resource, or a combination thereof. The transmitting device may encode a signal using the sequence. The transmitting device may transmit the signal using the identified time-frequency resource to indicate the physical location of the transmitting device.