Tag: TETCOS

A Vehicular Adhoc Network (VANET) is a network that provides communication between moving vehicles (V2V) and infrastructure (V2I). VANETs are a rapidly emerging research topic. However, VANET field testing is extremely expensive, time-consuming and practically challenging. NetSim addresses these concerns by allowing users to
create and analyze real-world conditions within the simulator. IEEE 1609 defines the architecture and provides the standards for Wireless Access in Vehicular Environments (WAVE) that defines vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) wireless communications.

NetSim allows for VANET simulations per MAC/PHY standards defined in IEEE 802.11p, IEEE1609 WAVE and LTE.

NetSim™ – SUMO Interfacing

Simulation of IEEE 1609 WAVE based VANET Networks can be achieved by interfacing NetSim with SUMO (Simulation of Urban Mobility), an Open Source traffic simulation software. Users can model the number of vehicles, the direction and velocity of their movement, the features of the wireless network transceivers, the routing protocol,
etc. During simulation NetSim gathers data about the network to measure protocol performance. This includes application throughput, link utilization, packet delays, packet errors, packet delivery ratio etc.
Moreover, it is possible to visualize mobility & communication in VANET using NetSim animator.
These VANET simulation features would be useful to engineers & researchers working on the communications architecture for DSRC – based V2V and V2I interactions.

Other External Interfaces

• MATLAB and Simulink
• Python
• Wireshark for packet capture and analysis
• NetSim Emulator to connect simulator to real devices

VANET Research Work-flow using NetSim™

VANET Network Stack

Application Layer

• Basic Safety Message (BSM) Protocol as per standard J2735
• Dedicated Short Range Communications (DSRC) Message

Transport Layer

Wave Short Message Protocol (WSMP)
* WSM Transmission
* WSM Reception
* Service Requests and Channel Access Assignment
* Service Channel (SCH) and Control Channel (CCH)

Network Layer

• IPv4
• Routing Protocols
  * DSR
  * AODV
  * ZRP
  * OLSR

MAC Layer

• IEEE1609
  * Resource Manager – IEEE 1609.1
  * Network and Transport Services – IEEE 1609.3
  * Multi-Channel Co-ordination – IEEE 1609.4
• IEEE802.11p
• Protocol for QoS: IEEE802.11e
  

   PHY Layer

• IEEE 1609
• IEEE 802.11p for VANET but users can also use IEEE 802.11 a/ b / g / n / ac

RF Propagation Models

• Path Loss
  * Friis Free Space Propagation
  * Log Distance
  * HATA Suburban, HATA Urban
  * COST 231 HATA Suburban, COST 231 HATA Urban
  * Indoor Office, Indoor Factory, Indoor Home
• Shadowing Model
  * Constant
  * Lognormal
• Fading Model
  * Rayleigh
  * Nakagami

NetSim Analytics

A variety of network performance metrics is reported including

• Link Throughput
• Packet Delay
• Packet Delivery Ratio
• Routing Overhead
• IP Forwarding Table
• Packet Retransmissions
• Graphical plots over time … and more

Packet Trace: Users can log details of each packet as it flows in the network.

Event Trace: Users can log details of each event of the protocol FSM while execution of the discrete event simulation

LTE Based VANETs

VANETs based on LTE can also be simulated using NetSim. An example use-case is where vehicles use LTE to send/receive data to/from a remote server to make smart decisions regarding route planning and driving. A typical research problem would be to develop algorithms/architectures to ensure that the connection among vehicles and to the LTE infrastructure is ultra-reliable when the vehicles are moving at a high speed.

Key Research Areas

Some of the key research areas and challenges in VANETs are as under:

• Quality of Service (QoS)
• Efficient Routing Algorithms Design
• Evaluation of New Communication Protocols
• Network Attacks and Countermeasures

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