Vehicular Adhoc Networks (VANET) Specifications
Overview
Connected vehicle (CV) technologies enable a wide range of transportation applications in safety, mobility, and infotainment. While holding tremendous promise, the success of these CV-enabled applications will rely on the quality of the underlying information flow.
NetSim is a simulation tool to model, simulate and analyze this information flow. The vehicular communication architecture in NetSim is based on a combination of the IEEE 1609 standard and IEEE 802.11p standard. The 802.11p standard defines the PHY and MAC layers while IEEE 1609 defines the upper layers.
NetSim Vanet
Users can simulate realistic vehicular networks (VANETs) by interfacing NetSim with SUMO (Simulation of Urban Mobility) an open-source traffic simulation software. NetSim handles simulation of the wireless network communication between the vehicles, while road traffic conditions can be modeled conveniently in SUMO.
WAVE Stack
- MAC and PHY
- IEEE 802.11p PHY operating in the 5.9 GHz band with channel bandwidths of 5, 10 and 20 MHz. 802.11p is an adaptation of the IEEE 802.11a standard used in Wi-Fi systems.
- IEEE 802.11p MAC layer. Stations communicate directly outside the context of a BSS. Carrier Sense Multiple Access Collision Avoidance (CSMA/CA) protocol. Standard Channel (SCH) and Control Channel (CCH) to prevent data collisions with safety message transmissions.
- Upper layer
- IEEE 1609: Defines the protocols and services (DSRC and WAVE) for V2V (vehicle-to-vehicle) and V2I (vehicle-to-infrastructure) communication in VANETs
- IEEE 1609.1, IEEE 1609.2, IEEE 1609.3 and IEEE 1609.4
Radio propagation
- Various pathloss, shadowing and fading models.
Ad hoc Routing
- Spontaneous Adhoc network formation between the VANET nodes
- Protocols supported: AODV, DSR, OLSR, and ZRP
Mobility Models
- SUMO-based for realistic vehicular movement and traffic conditions. Automatic import of road network and vehicle mobility from SUMO.
- File-based model to set custom vehicle movement patterns
- Inbuilt random mobility models.
Application Models
- File transfer, Video, Voice, Email, HTTP, Gaming and more
- BSM safety application
Simulation Results
- Time series plots for Application Throughput, Application Latency, Link Throughput, and more.
- Network Level Metrics: Packets Transmitted, Packets Received, Packet Errors, Collisions, Retransmissions and more. Metrics can then be drilled down per device or per application flow.
- Detailed Packet Trace: Logs a set of parameters for every packet as it flows through each device in the network, such as arrival time, queuing time, departure time, payload, overhead, errors, collisions etc.
- Radio measurements: Logs radio parameters such as SNR, SINR, Pathloss, MCS, etc., for all packets transmitted by all devices
Source code
- Protocol source C code is included. Users can modify to write their own algorithms
Emerging research areas
Enhancing Road Safety:
Explore cooperative driving methods and collision avoidance strategies to make driving safer and reduce accidents.
Example NetSim application: VANETs: UAV to Vehicle Communication for Accident Alert and Rerouting - establishing communication between vehicles and UAVs to monitor traffic and send alert messages in case of accidents.Optimizing Traffic Flow:
Developing intelligent algorithms to manage traffic efficiently, control congestion, and plan routes for smoother traffic movement.
Example NetSim project: Dynamic Traffic Light Control in NetSim VANETs - enabling communication between vehicles and roadside units to improve road safety and manage traffic by dynamically controlling traffic signals based on traffic conditions.AI/ML for VANETs:
Utilizing AI and ML to analyze data, detect anomalies, and make intelligent decisions in VANETs.
NetSim References:Additional reference articles and projects in NetSim:
- How to use SUMO NetEdit utility and randomtrips.py to configure road traffic models? - provides an explanation of how SUMO integrates with NetSim and outline the steps to create a VANET network scenario in NetSim.
- How to simulate an accident in NetSim – Modeling accidents in NetSim VANET network
- Online coupling of NetSim and SUMO – Interfacing with SUMO using TraCI API commands
- Clustering in VANETs – Implementing dynamic clustering in VANETs with Roadside Units (RSUs) serving as cluster heads, including MATLAB interfacing.
- Vehicle arrival and departure in VANETs – Ensuring that vehicles are included in the simulation only when they enter the road network in SUMO and are removed once they reach their destination or complete their movement.