Black-Burst-Based Multihop BroadcastProtocols for Vehicular Networks

Black-Burst-Based Multihop BroadcastProtocols for Vehicular Networks

Gökhan Korkmaz, Eylem Ekici, and Füsun Özgüner

Member, IEEE

IEEE TVT 2007

Outline

Introduction1

Directional Broadcast2

Intersection Broadcast3

4 Performance Evaluation

5 Conclusion

4

Introduction

In Intervehicular Communication (IVC) systems, broadcast is a frequently used method. Possible applications relying on broadcast include sharing emergency traffic weather road data among vehicles delivering advertisements announcements

Introduction

These applications generate packets of various lengths at different rates. accident warnings are short packets that are generated infrequently warning packets reporting slippery road conditions are generally

short advertisement packets can be broadcast in very long packets that

carry pictures, directions, or even short videos

Related Work

Source

Destination

A

B

CD

Goal

Design a special MAC layer for efficient and reliable multihop message dissemination in VANETs address the broadcast storm, hidden node, and reliability problems

of multihop broadcast in vehicular networks.

Directional Broadcast

Request to Broadcast (RTB) Packet

<Position, Intended Broadcast Direction>

Intended Broadcast Direction

Source

AB

C

Black-burst signal

Directional Broadcast

Request to Broadcast (RTB) Packet

<Position, Intended Broadcast Direction>

Intended Broadcast Direction

Source

AB

C

Black-burst signal

1

Duration of the Black-burst

SlotTimeR

NdL

max

1

L1 ： black-burst duration in the first iteration

d ： the distance between the source and the vehicle

R ： the transmission range

Nmax ： number of segments created

SlotTime ： length of one slot

0 2

Duration of the Black-burst

SlotTimeR

NdL

max

1

030

35max

1

SlotTimeSlotTime

R

NdL

Source

10 10 10

SlotTimeSlotTimeSlotTimeR

NdL

2

30

325max

1

Duration of the Black-burst

Source

Duration of the Black-burst

Source

Intersection Broadcast

Urban Multihop Broadcast (UMB)Obstacle

Vehicle

Infrastructure

Intersection Broadcast

Ad hoc Multihop Broadcast (AMB) Vehicle

BA C

D

E

F

Hunter Vehicle

Performance Evaluation

Success Probability Comparison

Performance Evaluation

Successful Packet Delivery Percentage

Performance Evaluation

Packet Dissemination Speed

Conclusion

Two position-based multihop broadcast protocols for IVC networks have been proposed

The UMB protocol employs repeaters installed at the intersections. AMB is an extension of the UMB protocol with a fully ad hoc intersection

broadcast mechanism.

Design a special MAC layer for efficient and reliable multihop message dissemination in VANETs address the broadcast storm, hidden node, and reliability problems of

multihop broadcast in vehicular networks.