Emergency Messages in VSNs By: Noor Ullah Contents Introduction - - PowerPoint PPT Presentation

emergency messages in vsns
SMART_READER_LITE
LIVE PREVIEW

Emergency Messages in VSNs By: Noor Ullah Contents Introduction - - PowerPoint PPT Presentation

Emergency Messages in VSNs By: Noor Ullah Contents Introduction Problems EWM Dissemination in VSNs Conclusion 2 Introduction Emergency Situations Accidents Natural Disasters VANETs Vehicular communication


slide-1
SLIDE 1

Emergency Messages in VSNs

By: Noor Ullah

slide-2
SLIDE 2
  • Introduction
  • Problems
  • EWM Dissemination in VSNs
  • Conclusion

Contents

2

slide-3
SLIDE 3
  • Emergency Situations

– Accidents – Natural Disasters

  • VANETs

– Vehicular communication – Safety purpose – Infotainment purpose

Introduction

3

slide-4
SLIDE 4
  • Emergency Warning Messages

– Issued by source vehicle – Broadcast to effected area – V2V – V2I

4

Introduction

slide-5
SLIDE 5
  • Flooding [1]

– Every Node rebroadcasts every message

  • Faces Broadcast Storm Problem
  • Epidemic [2]

– Shares all messages in buffer upon each contact – Negotiates which messages to share

  • Creates Delay, Overhead

5

Introduction Contd...

1.

  • K. Obraczka, K. Viswanath, and G. Tsudik, “Flooding for reliable multicast in multi-hop ad hoc networks,”

Wireless Networks, vol. 7, no. 6, pp. 627–634, 2001 2.

  • A. Vahdat and D. Becker, “Epidemic Routing for Partially Connected Ad Hoc Networks,” in Technical Report CS-

200006, Apr 2000.

slide-6
SLIDE 6
  • Every node rebroadcasts

– Network congestion – Crash down

Broadcast Storm Problem

6

slide-7
SLIDE 7
  • Access Point (AP) knows about Nodes
  • Nodes may not know about AP

– Collision – Distortion

Hidden Node Problem

7

slide-8
SLIDE 8
  • Exploiting human factors

– Social relationships – Direct/Indirect

  • Vehicular Mobility

– Common routes – Patterns

  • Communication means

– WAVE/DSRC, cellular etc

Vehicular Social Networks

8

a b c d e f

slide-9
SLIDE 9
  • “Vehicular Social Networks: Enabling Smart

Mobility”

– In IEEE Communication Magazine

  • Smart Cities

– Integration of innovative technologies for management of city’s facilities

9

Our Paper on VSN

slide-10
SLIDE 10
  • Selfishness

– Social selfishness

  • Delay
  • Simulation and Analysis

– Real Databases cannot be used – Relies on simulation

10

Challenges for EWMs in VSNs

slide-11
SLIDE 11
  • Vehicular Location Data

– Coordinates, distance b/w two vehicles from GIS

  • Social features

– Centrality, similarity, community etc

  • Suitable dissemination strategy

Proposed Method

11

X1, y1 Xn, yn Danger Zone Immediate Zone Social Zone

slide-12
SLIDE 12
  • VANETMobisim

– Generates traces of vehicles mobility – Java based application – Xml coding

  • NS2

– Famous network modeling simulator

12

Simulation Tools

slide-13
SLIDE 13
  • EWMs dissemination is important
  • Different problems exist
  • Solutions based on VSNs have to be explored

13

Conclusion

slide-14
SLIDE 14

Suggestions are Welcome!

Any Questions?

14