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Multimedia Communications Telemedia Technology towards Ubiquitous Seamless Multimedia Communications
Multimedia Communications: Staff ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Topics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
KOM III: P2P Networking - Shaping the Future of P2P Quorum of trusted peers A B 2 3 1 issue tokens 4 service delivery token transfer Account holder control/avoid double spending Selected via reputation system 1. 2. prevent forgery Service Delivery Overlay Connection Overlay X Scenario User Behaviour Token-based Accounting Evaluation of P2P Overlay Networks ,[object Object],[object Object],[object Object],If you are interested in shaping the future of P2P, contact:  [email_address] Enabling commercial P2P applications e.g. in Health Care  Which is the best Overlay? KOM P2P Simulator
KOM III: P2P Networking - Shaping the Future of P2P A B C D E G H I J K F search query Location-based Search Efficiency for Rescue Operations Optimize resource usage in peers Balance resource allocation in overlay Investigate strategy to cope with P2P traffic P2P communication in rescue operations Modeling of a P2P Overlay Closest Italian restaurant? P2P  = up-to-date information If you are interested in shaping the future of P2P, contact:  [email_address] Efficient Search in Surrounding A B C D E F G H I J K
KOM III: Peer-to-Peer Accountability  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Trusted Peer Trusted Peer Trusted Peer Trusted Peer Trusted Peer Collected (foreign) Tokens 2 3 5 6 7 New  (unsigned)  Tokens Partially signed  Tokens New  Tokens 1 4 4 4 4 Signing with partial keys Peer ,[object Object],[object Object],[object Object],8 Combining tokens
Research Challenges: Quality Properties  (English) Costs Security Quality of P2P Systems Trust Adaptivity Efficiency Validity Retrievability Coherence Consistency Correctness Performance Scalability Flexibility Stability Dependability Services Provisioning Overlay Operations Individual Nodes Complete System (Impact on) IP Infrastructure Availability Reliability Robustness Integrity Confidentiality Authentication Non-repudiation see DFG Forschergruppe QuaP2P, TU Darmstadt (www.quap2p.de)
KOM III: Peer-to-Peer Quality Properties  (German) Aufwand Sicherheit Qualität von P2P-Systemen Lokalisierbarkeit Kohärenz Konsistenz Korrektheit Leistungsfähigkeit Skalierbarkeit Flexibilität Stabilität Verlässlichkeit Dienster-bringung Overlay-Operationen Individueller Knoten Gesamtes System IP Infrastruktur Verfügbarkeit Zuverlässigkeit Robustheit/ Fehlertoleranz Integrität Vertraulichkeit Authentizität Verbindlichkeit Vertrauenswürdigkeit Validität Effizienz Adaptivität see DFG Forschergruppe QuaP2P, TU Darmstadt (www.quap2p.de)
KOM III: Location-based Search and P2P ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Results ,[object Object],[object Object]
KOM III: A P2P Overlay for Location-based Search ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
KOM III: Simulation of Large Scale P2P Networks ,[object Object],[object Object],User Layer Overlay Layer Simulation Core Network Layer Package  Lost … … … Delay  Model Connection Management Routing Model Resource Model Online-time Model Requested Services Offered Services Look-up Model
KOM III: Evaluation of P2P (Overlay) Networks Trade-offs Mechanisms CANdemila Metrics 0 1 2 3 4 5 100 0 200 300 500 400 ms 48 132 187 383 411 492 Benchmarks Chordtella
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Heterogeneous model KOM III: Efficiency in Peer-to-Peer Systems Chord Gnutella Kademlia Homogenous graph   Reality CAN
KOM III: Research Agenda for Improving Efficiency ,[object Object],[object Object],[object Object],Layers of Interest   Evaluation Devices IP Infrastructure 3 P2P Overlay 2 User Layer Overlay Layer Simulation Core Network Layer PeerfactSim.KOM Concepts for  1 Concepts for  2 ^ Peer IN OUT 10100110110001000110011 1
KOM III: Issues at P2P (Overlay) Networks Underlay Networks Overlay network 1. Efficient Mapping 2. Heterogeneity 5. Dependency/Security 4. Scalability/Extendability 6. Fault-tolerance 3. Incentives/Fairness
KOM III: Peer-to-Peer Overlays ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
KOM III: Location Aware Services and P2P ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],http://www.haddock.org/directory/?i=13119
KOM III: Example CamNet Application ,[object Object],[object Object],[object Object],[object Object],[object Object]

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TU Darmstadt - KOM - P2P Group Overview 2006

  • 1. Multimedia Communications Telemedia Technology towards Ubiquitous Seamless Multimedia Communications
  • 2.
  • 3.
  • 4.
  • 5. KOM III: P2P Networking - Shaping the Future of P2P A B C D E G H I J K F search query Location-based Search Efficiency for Rescue Operations Optimize resource usage in peers Balance resource allocation in overlay Investigate strategy to cope with P2P traffic P2P communication in rescue operations Modeling of a P2P Overlay Closest Italian restaurant? P2P = up-to-date information If you are interested in shaping the future of P2P, contact: [email_address] Efficient Search in Surrounding A B C D E F G H I J K
  • 6.
  • 7. Research Challenges: Quality Properties (English) Costs Security Quality of P2P Systems Trust Adaptivity Efficiency Validity Retrievability Coherence Consistency Correctness Performance Scalability Flexibility Stability Dependability Services Provisioning Overlay Operations Individual Nodes Complete System (Impact on) IP Infrastructure Availability Reliability Robustness Integrity Confidentiality Authentication Non-repudiation see DFG Forschergruppe QuaP2P, TU Darmstadt (www.quap2p.de)
  • 8. KOM III: Peer-to-Peer Quality Properties (German) Aufwand Sicherheit Qualität von P2P-Systemen Lokalisierbarkeit Kohärenz Konsistenz Korrektheit Leistungsfähigkeit Skalierbarkeit Flexibilität Stabilität Verlässlichkeit Dienster-bringung Overlay-Operationen Individueller Knoten Gesamtes System IP Infrastruktur Verfügbarkeit Zuverlässigkeit Robustheit/ Fehlertoleranz Integrität Vertraulichkeit Authentizität Verbindlichkeit Vertrauenswürdigkeit Validität Effizienz Adaptivität see DFG Forschergruppe QuaP2P, TU Darmstadt (www.quap2p.de)
  • 9.
  • 10.
  • 11.
  • 12. KOM III: Evaluation of P2P (Overlay) Networks Trade-offs Mechanisms CANdemila Metrics 0 1 2 3 4 5 100 0 200 300 500 400 ms 48 132 187 383 411 492 Benchmarks Chordtella
  • 13.
  • 14.
  • 15. KOM III: Issues at P2P (Overlay) Networks Underlay Networks Overlay network 1. Efficient Mapping 2. Heterogeneity 5. Dependency/Security 4. Scalability/Extendability 6. Fault-tolerance 3. Incentives/Fairness
  • 16.
  • 17.
  • 18.

Hinweis der Redaktion

  1. Kalman is Dipl.-Math. Dipl.-Inf. K.Graffi
  2. Instead of „Overlay Networks“ – design of overlay networks Add: simulation of a large scale peer-to-peer networks Remove: security in p2p networks Question: Economic&accounting? Those separately? Impoved Scientific Methods? What does it mean? Applications and scenarios? I think we shoudl discuss about it because it should really very noticeable represent what we are working, not general and fuzzy.
  3. This will stay?
  4. This will stay?
  5. This + referenz szenarien should be one slide
  6. Es stellt sich nun die Frage, mit welchen Mitteln ich die Effizienz von P2P Systemen verbessern möchte. Dazu möchte ich den aktuellen Stand in Peer-to-Peer Forschung beschreiben. Momentane Forschung betrachtet Peer-to-Peer Netze als einen Graphen. (Beispiel. Chord, Can, Gnutella, Kademlia) Dabei wird aber etwas entschiedenes wegabstrahiert: Die Heterogenität der Peers, der Links und der Nachrichten Mein Ansatz besteht darin die Heterogenität in das Modell zu integrieren und dann gezielt die Engpässe anzugehen. Z.B. ist die Uploadbandbreite in heutigen Netzen für gewöhnlich der entscheidende Engpass. Overlays wie Chord, Can und Kademlia berücksichtigen diese Attribute aber in ihrem System nicht. So dass es vorkommen kann, dass die Ressourcenallokation im Netzwerk ineffizient ist. Rechner mit wenig Bandbreite sind dann evtl. für stark nachgefragte Objekte verantwortlich. Nun kann man gezielt die identifizierten Engpässe angehen und Lösungen entwickeln, um diese aufzulösen.
  7. Effizienzverbesserungen untersuche ich dabei auf 3 Ebenen. Zum einen in dem Peer selbst. Dort wird überprüft, wie die vorhandenen Ressourcen bestmöglich genutzt werden können. Im nächsten Schritt betrachte ich dann die Ressourcenallokation im Overlay, dabei untersuche ich, welches Peer welche Ressourcen in welchem Umfang beisteuern muss, damit die Last fair aber auch effizient verteilt wird. Im letzten Schritt werde ich dann die Wechselwirkung mit dem darunteliegenden IP Netzwerk betrachten. P2P Traffic dominiert in der heutigen Zeit das Internet, 70-80% des gesamten Traffics ist auf P2P Applikationen zurückzuführen. Es ist somit auch wichtig zu untersuchen, wie dieser Traffic gesenkt werden kann und welche Strategien zum Behandeln von P2P Traffic Internet Service Provider verfolgen können. Meine Ergebnisse aus dem Forschungspunkten 1 und 2 werden ich in KOMs P2P Simulator umsetzen und evaluieren
  8. out
  9. out
  10. out
  11. out