Delay Tolerance in a Network of Information Dirk Kutscher – NEC Labs SAIL Project Consortium DTNRG...

Delay Tolerance in aNetwork of Information

Dirk Kutscher – NEC Labs

SAIL Project Consortium

DTNRG Meeting @ IETF-782010-07-30

DTN Community:We have come a long way

• Interplanetary Networking– Networking the orbit, solar system, universe

• DTN Architecture and Bundle Protocol– Generalized Architecture– Space communications as a customer – Bundle transport without permanent end-to-end paths– Store-and forward– Late name resolution– Custody transfer– Convergence layer concept– Routing with different levels of knowledge of network topology,

offered load and connectivity graphs over time

Many Uses• Designed for Space Communication

– but not limited to that

• Application Areas– Opportunistic (social) networking– Vehicular networking– Habitat monitoring– Infrastructure-less (-reduced) communication services

• Research Topics– Routing in disruption-prone environments, considering time dimension– Applications for message-oriented architectures– Self-organized content distribution– Addressing and naming

• Applications– Information-kiosks for developing countries– Publish-subscribe based content distribution– Web over DTN

DTN Pub/Sub Protocol (DPSP) Leveraging replication-based distribution in opportunistic networking

scenarios for cost-efficient and scalable content distribution DTN Multicast distribution based on Publish-Subscribe model Objective: reliable and timely distribution

Based on local replication decisions Taking limited resources (storage, bandwidth) into account

Not requiring global knowledge about the network Instead: Relying on Publish-Subscribe model Leveraging information about subscriptions (e.g., receiver interest)

Configurable bundle selection and prioritization mechanism Select and order bundles for transmission/storage in order to meet objectives

Source: forecast

Channel: weather/hazards

Channel: weather/travel ContentBundle

SubscribeRequest

Subscriber

Node

Contact

Janico Greifenberg, Dirk Kutscher;Efficient Publish/Subscribe-based Multicast for Opportunistic Networking with Self-Organized Resource Utilization ;WON-2008; March 2008

Example:

Applications Beyond Research?

• Opportunistic social networking

• DTN Concepts for mobile communication services?– Augmenting wireless infrastructure– Improving quality of experience– Enabling reduced operation (energy saving…)

Virtual Telco View

• Delay Tolerance? – go away!

• We got LTE, and its going to be superfast– Ubiquitous infrastructure– Well-managed, congestion cannot happen– Cannot sell “delays”

• But…

An Inconvenient Prospect

Cisco Forecasts 3.6 Exabytes per Month of Mobile Data Traffic by 2014

Drivers for Mobile Data Traffic Growth

Video Will Account for 66 Percent of Global Mobile Data Traffic by 2014

Problems• Revenue does not keep up with traffic increase

Mobile industry is looking for solutions NOW…

Example: Architectural Changes in 3GPP

• Step 1: Offloading high-volume traffic via local break-out points– Deviating from core network tunnel concepts– Allow for local gateways “to the Internet”– Originally for femto base stations – now adopted for macro network– General trend: decentralization

Gateway (NAT enabled)

L-PGW

MME

SGW PGW

Backhaul

192.168.1.1

192.168.1.10

IP to Backhaul: 222.2.2. 2 SeGW

HeNB

IPSec

IPSec

IPSec

SIPTO Traffic

Step 2: Content Caches at the Edge

Content Servers

PDN Gateways /edge caches

IETF ALTO and DECADE• IETF ALTO

– Application Layer Traffic Optimization

– Help P2P clients to better select peers for requested content

– Motivation: operator cost reduction

• IETF DECADE– DECoupled Application Data

Enroute– Access in-network storage– Motivation: P2P efficiency

ALTO Server

ALTO Client

(Tracker)

ALTO Client(Peer)

ALTO Protocol

StandardProtocol

P2P ProtocolsP2P Peer P2P Peer

Storage

P2P Peer

Trends• Imminent traffic volume explosion

– Video distribution as (literally) a killer application– Resource management issues unsolved today

• Information-centric concepts are proliferating– CDNs: transparent redirection of requests to topologically close servers– P2P: location-agnostic exchange of content chunks– IETF ALTO: align peer selection with network topology (operator policies)– IETF DECADE: access named content in storage servers– Machine-to-Machine Communication

• Information-centric research activities– 4WARD NetInf: Information-centric networking with a flat naming scheme– CCN: Content-centric networking with a hierarchical naming scheme – PSIRP: Publish/subscribe for Internet level communication– DTN: Delay-Tolerant Networking based on Bundle protocol

Upcoming Activities• Take information-centric networking to the next level

– General-purpose information-centric architecture– … scalable to global deployment– …Beyond content distribution– … with inbuilt delay tolerance

• Applicable to specific scenarios– Considering real-world requirements and on-going developments– Mobile communication, M2M– Operator requirements– Business models, economic models

• Relationship to DTN– DTN concepts for Information-centric– Network of Information based on DTN

Scalable and Adaptive Internet Solutions Project

• EU-FP7 Integrated Project– Industry focus: major European vendors and

operators– Network of Information one of three technical areas– Starts August 1st, runs for 2.5 years

Scalable and Adaptive Internet Solutions Project

• EU-FP7 Integrated Project– Industry focus: major European vendors and

operators– Network of Information one of three technical areas– Starts August 1st, runs for 2.5 years

http://www.sail-project.eu/

Don’t use before Aug 1 st ;-)