PC5 Sidelink Traffic Detection via Segmented Broadcast Chains
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Solution Overview
Problem
Existing traffic monitoring systems face challenges in accurately and timely detecting traffic situations with high vehicle participation while minimizing infrastructure and communication costs, particularly in efficiently transmitting vehicle position, speed, and type information over a predefined road section.
Innovation Solution
A method utilizing PC5 sidelink functionality, specifically Mode 4, for device-to-device communication among road users to broadcast and relay traffic information, creating a mesh of broadcast message chains that cover a geographical area, allowing for efficient data transmission and vehicle participation without relying on extensive infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a plurality of broadcast messages are transmitted to cover a road section, then the coverage and vehicle detection capability are improved, but the communication effort and message overhead increase
Solution Approach 1:
The road section is divided into multiple sub-sections, with each broadcast message covering a specific sub-section. This segmentation allows the system to achieve complete coverage of the entire road section while minimizing the total number of messages by assigning each message to a specific segment rather than transmitting redundant full-coverage messages.
2Measurement precision
If more vehicles participate in broadcasting to improve detection accuracy, then the traffic situation detection capability is improved, but the communication effort and energy consumption increase
Solution Approach 1:
Vehicles are assigned to broadcast messages based on their local position and the specific sub-section they are covering. Each vehicle participates in broadcasting only when it is relevant to a particular sub-section, rather than all vehicles continuously broadcasting. This local quality approach ensures accurate traffic detection for each sub-section while minimizing overall energy consumption by limiting participation to only those vehicles that are locally relevant.
3Loss of time
If broadcast messages are transmitted frequently to improve timeliness of traffic information, then the topicality of traffic data is improved, but the communication overhead and infrastructure costs increase
Solution Approach 1:
Broadcast messages are transmitted periodically at optimized intervals rather than continuously. The periodic transmission is configured to maintain timely traffic information update while reducing the frequency to acceptable levels that minimize communication overhead and infrastructure requirements. This periodic action allows the system to achieve adequate timeliness without the excessive resource consumption of continuous broadcasting.
Data Source
Figure 1
AI summary
A method is described for recording a traffic situation in a geographical area by transmitting a message content from a stationary sender to a stationary receiver via a plurality of mobile road users, wherein both the sender and the plurality of mobile road users are capable of sending broadcast messages with a message content, wherein the message content of at least one broadcast message from the sender to at least one of the plurality of mobile road users is transmitted by means of a PC5 sidelink functionality, in particular using the Mode 4 functionality, wherein the method for recording the traffic situation with respect to a considered road user of the plurality of mobile road users comprises the following steps: -- in a first step, the considered road user receives at least one broadcast message,wherein the message content of the at least one broadcast message comprises at least: -- message identification information, -- area information for defining the geographical area, -- repetition information, and -- aggregation time information; -- in a subsequent second step, the road user in question transmits at least one further broadcast message, wherein the at least one further broadcast message comprises as its message content the message content of the received at least one broadcast message and at least one supplementary piece of information, wherein the supplementary information comprises at least: -- position information of the current position of the road user in question, -- speed information of the road user in question, -- current timestamp information, and -- additional information. 13.