Cellular Broadcast for Dynamic Traffic Sign Updates
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Solution Overview
Problem
Current methods for transmitting dynamic traffic sign information, such as changing speed limits and traffic lights, to road users are inefficient due to limitations in optical systems and limited radio range, leading to incomplete and unreliable dissemination of information.
Innovation Solution
A method and system that utilize a cellular mobile radio network to transmit traffic sign information from traffic sign systems to a central server, which then broadcasts this information via broadcast or multicast messages within specific cells where affected road users are located, optimizing the transmission frequency based on the change frequency and importance of the information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If V2V and V2I systems are used to transmit traffic sign information directly from traffic signs to vehicles, then the information can be transmitted to individual vehicles, but the radio range is limited to 500 to 1000 meters and radio resources are not efficiently utilized
Solution Approach 1:
The patent introduces a backend server as an intermediary between traffic signs and vehicles. The server receives traffic sign status information from infrastructure, stores it in a database, and redistributes it to multiple vehicles via cellular network. This mediator extends the coverage area beyond the limited 500-1000m radio range of direct V2I communication while efficiently utilizing cellular network resources through broadcast/multicast mechanisms.
2Reliability
If traffic sign information is transmitted to each individual vehicle separately, then each vehicle receives the information, but the utilization of radio resources is not particularly high or efficient
Solution Approach 1:
The patent merges multiple individual information transmissions into a single broadcast or multicast message sent by the backend server to multiple vehicles simultaneously. Instead of establishing separate communication channels from the server to each vehicle, the system uses cellular network broadcast/multicast functionality to deliver the same traffic sign information to all affected vehicles in a resource-efficient manner, significantly reducing overall radio resource consumption.
3Loss of information
If optical systems with cameras are used to detect traffic signs, then dynamic traffic sign state can be detected, but the detection range is limited and environmental conditions affect image quality
Solution Approach 1:
The patent replaces optical detection systems (cameras) with a radio-based information transmission system. Instead of using cameras to detect and interpret traffic sign visuals (which are limited by range and environmental conditions), the system uses radio communication infrastructure to directly transmit digital traffic sign status information to vehicles. This substitution eliminates the harmful effects of environmental interference on detection while providing more reliable and extensive coverage.
4Reliability
If static traffic sign information is continuously updated and transmitted, then all road users receive the latest information, but unnecessary updates are transmitted for information that does not change
Solution Approach 1:
The patent implements dynamic transmission frequency adjustment based on the actual change frequency of traffic sign information. The backend server monitors when traffic sign status actually changes and only initiates broadcast/multicast transmissions when updates are necessary. For static information that does not change, no transmission energy is wasted, while ensuring that all road users receive timely updates when dynamic changes occur.
Data Source
Figure 1
AI summary
The invention relates to a method for transmitting traffic sign information to at least one road user (11) currently affected by the traffic sign information, in particular to at least one vehicle, via a cellular mobile network (100), wherein the traffic sign information is transmitted from at least one traffic sign system (10) to a central server (110), the transmitted traffic sign information is linked with a location of the at least one traffic sign system (10) and, together with location information of the at least one traffic sign system (10), is broadcast by the central server (110) within at least one cell (A, B) of the mobile network (100) by means of at least one broadcast/multicast message, within which at least one cell (A, B) the at least one road user (11) is located at the time of broadcast.Furthermore, the present invention relates to a corresponding system and a mobile communication terminal suitable for carrying out the method.