Kernekoncepter
The author evaluates the ETSI Contention-Based Forwarding (CBF) GeoNetworking protocol for warning messages in highway scenarios, identifying shortcomings and proposing solutions to reduce transmissions while improving reliability.
Resumé
The paper assesses the performance of ETSI CBF for distributing warning messages in highway scenarios, highlighting issues with the DCC mechanism. Proposed solutions aim to enhance efficiency and reachability by reducing network overhead and improving reliability.
Several key points are addressed:
- ETSI ITS aims to improve road safety through message exchange among vehicles.
- DENMs are used to alert users of hazardous events via GeoNetworking protocol.
- CBF is a receiver-based forwarding algorithm based on timers.
- DCC regulates message sending rate at each transmitter to ensure efficient radio medium operation.
- Challenges include controlling network overhead while maximizing reachability in the area of interest.
Proposed improvements include adding Duplicate Packet Detection (DPD) to avoid retransmission waves, enabling source retransmission for reliability, and implementing Geographically-aware CBF Packet Cancellation (GPC) for better packet management at area borders.
Statistik
Several shortcomings of the standard ETSI CBF algorithm are identified.
Proposed solutions reduce transmissions by an order of magnitude while enhancing reliability close to 100% in a large area of interest.