Low-Power V2X Reception Timing Using Predicted Time-To-Collision
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Solution Overview
Problem
Existing V2X communication methods for road users require extensive processing and complex algorithms to determine reception timing, which significantly drain battery life and increase power consumption, especially when receiving thousands of messages per second.
Innovation Solution
A method for calculating the next reception time of road users based on predicted Time-To-Collision (TTC) and adjustable thresholds, using simplified distance and heading comparisons to reduce power consumption by intermittently receiving messages from non-tracked users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex algorithms (map matching, geometric line-crossing) are used to determine reception timing, then measurement precision is improved, but use of energy worsens
Solution Approach 1:
The patent segments road users into two categories: tracked road users (requiring precise TTC calculation) and non-tracked road users (using simplified next reception time calculation). This segmentation allows the system to apply complex algorithms only where necessary while using simplified methods for other cases, thereby reducing overall energy consumption while maintaining measurement precision for critical cases.
Solution Approach 2:
The patent applies partial action by using full complex algorithms (map matching, geometric line-crossing) only for tracked road users who pose potential safety risks, while using simplified calculations for non-tracked road users. This partial application of complex processing reduces energy consumption while maintaining sufficient precision for safety-critical scenarios.
2Reliability
If complex algorithms are used to calculate TTC and determine reception timing, then reliability is improved, but device complexity worsens
Solution Approach 1:
The patent divides the processing logic into two distinct pathways: one for tracked road users using complex algorithms (map matching, geometric line-crossing) and another for non-tracked road users using simplified next reception time calculation based on message intervals. This segmentation reduces overall device complexity while maintaining reliability for safety-critical cases.
Solution Approach 2:
The patent extracts the essential function of determining when to receive messages from non-tracked road users by using a simplified calculation based on message intervals and predicted TTC, removing the need for complex geometric computations in these cases. This extraction reduces processing complexity while maintaining sufficient reliability through selective application of simpler methods.
3Reliability
If messages from all road users are received continuously, then reliability is improved, but use of energy worsens
Solution Approach 1:
The patent segments road users into tracked and non-tracked categories, applying continuous reception only to tracked users who pose potential safety risks (maintaining reliability) while using intermittent reception based on calculated next reception times for non-tracked users (reducing energy consumption).
Solution Approach 2:
The patent implements periodic action by calculating next reception times for non-tracked road users based on their message intervals and predicted TTC, allowing the device to skip reception slots when not needed. This periodic reception pattern maintains safety monitoring coverage while significantly reducing energy consumption compared to continuous reception.
4Reliability
If next reception time is set to an earlier time to avoid missing safety risks, then reliability is improved, but use of energy worsens
Solution Approach 1:
The patent changes the parameter of next reception time calculation from fixed early intervals to dynamic values based on predicted TTC and message intervals. By adjusting the next reception time parameter according to actual risk levels (using predicted TTC and road user behavior patterns), the system maintains reliability while avoiding unnecessary early receptions that would increase energy consumption.
Data Source
AI summary
A method and non-transitory computer readable medium for reducing power requirements in a battery-operated V2X device associated with a self road user, the method comprising receiving in a current slot a message from a received road user, the reception having an associate reception energy; based on data in the message, predicting a lowest possible time-to-collision (TTC) between the self road user and the received road user, calculating a next reception time of the received road user in the current slot using the predicted lowest possible TTC and an adjustable threshold, and based on the calculated next reception time, deciding whether to receive or skip a next slot. Associated apparatus comprises a reception energy and time match module configured to compare a last energy associated with a message received from a road user occupying a slot with a previously known energy for the slot occupied by the same road user, and a V2X receiver configured to skip the remainder of the slot if the last energy for the slot does not significantly deviate from the previously known energy for the slot, or if a next reception time for the user occupying the slot has not yet been reached, thereby reducing the power requirements in the battery-operated V2X device.