ccnxcon2012: session 3: content-centric vanets: routing and transport issues

Content Centric VANETs: Routing and Transport issues

Marica Amadeo, Claudia Campolo and Antonella Molinaro

Speaker Marica Amadeo CCNxCon, September 12, 2012

Motivations

CCN in Vehicular Ad Hoc NETworks CCN is an attractive solution for wireless networks with dynamic topologies

Several design challenges need to be addressed

INTERNET

vehicle-to-vehicle communication (V2V)

vehicle-to-infrastructure communication

(V2I)

Sensors

V2I

V2V

Unique applications Traditional Internet-‐based applications + new applications (safety/non-‐safety) designed for the road environment

Vehicle mobility Quickly changing network topologies and short V2V and V2I connection lifetimes

Node capabilities

GPS, unlimited power and storage

Ad-‐hoc defined protocol stack WAVE platform (IEEE 802.11p + IEEE 1609)

3

VANETs Features

CCN in VANETs

Potential benefits

Zero configuration networking

Matching the nature of location-‐relevant applications

Easy and effective in-‐network caching

Service over sporadically connected links

INTEREST

DATA

CONSUMER PROVIDER

FORWARDING ENGINE

CS

PIT

FIB

CCN in VANETs

Main issues

Architectural Issues CCN and WAVE deployment

Routing Issues Broadcast channel, highly dynamic network topologies, short-‐lived and intermittent connectivity

Transport Issues Reliability, Flow control, Congestion Control

CCN in VANETs: Main Issues

Architectural Issues

CCN and WAVE deployment:

How to work with legacy protocols?

Routing Issues

Transport Issues

Our Architectural Vision

Content-‐Centric Vehicular Networking (CCVN) non-‐safety data retrieval and dissemination

compliant with IEEE 802.11p

WSMP

802.11p MAC

LLC

802.11p PHY

SAFETY APPLICATIONS

NON-‐SAFETY APPLICATIONS

CCVN WSMP IPv6

802.11p MAC

LLC

TCP UDP

802.11p PHY

SAFETY APPLICATIONS

NON-‐SAFETY APPLICATIONS

Legacy WAVE stack With CCVN



Routing Issues

Broadcast channel, highly dynamic network topologies, short-‐lived and intermittent connectivity:

How to limit broadcast storm?

How to efficiently forward Interest and Data packets?

Transport Issues

Routing and Forwarding in CCVN

Counter-‐based scheme over each Interest and Data forwarding to counteract broadcast storm

Scalable content delivery Provider discovery via (multi-‐hop) Interest broadcasting

Providers stored in the Content Provider Table (CPT)

Content delivery:

Consumers choose their provider according to a given selection criterion

Path-‐state information in Data and Interest packets

M. Amadeo, C. Campolo, A. Molinaro Content-centric networking: is that a solution for upcoming



Layer 3 Issues

Layer 4 Issues

Reliability: How to manage Interest retransmissions?

Flow control: How to control the Interest transmission rate?

Congestion Control: How to achieve congestion detection and avoidance?

Transport in CCVN

One Interest per Data packet

Reliability A Consumer retransmits the Interest if the Data is not received within a retransmission timeout interval, which depends on the estimated RTT

Interest transmission rate Simple choice: One Interest per RTT

Congestion control not performed yet

M. Amadeo, C. Campolo, A. Molinaro Content-centric networking: is that a solution for upcoming

Preliminary Evaluation

Simulation Scenario

Simulator: ns-‐2

Urban area

1 RSU and 100 vehicles

VanetMobiSim mobility (20-‐40km/h)

Content size: 500 kbytes

RSU

300 m

300 m

RSU

Results

Fraction of nodes able to receive at most a given amount of bytes of the requested content

5 downloads 20 downloads

Results

Cumulative distribution function of the download time

5 downloads 20 downloads

Conclusions

Some references about CCN in ad hoc networks M. Amadeo, A. Molinaro Content-‐Centric Architecture for IEEE

802.11 MANETs NoF 2011.

M. Amadeo, A. Molinaro A Content-‐Centric Architecture for Green

M. Amadeo, C. Campolo, A. Molinaro CRoWN: Content-‐Centric Networking in

Next steps: Layer 4 issues Interest flow control

Interest pipelining?

Congestion control

Explicit congestion notification?

Thanks for your attention

Content Centric VANETs: Routing and Transport issues

Marica Amadeo, Claudia Campolo, Antonella Molinaro

[email protected]

ccnxcon2012: session 3: content-centric vanets: routing and transport issues

Technology