A Proactive and Distributed QoS Negotiation Approach for Heterogeneous environments

1. A Proactive and Distributed QoS Negotiation Approach for Heterogeneous environments Anis Zouari, Lucian Suciu, Jean Marie Bonnin, and Karine Guillouard 18/09/2008

2. summary 1 2 • Introduction • Related work: QoS management in heterogeneous systems • Reactive approach: DAIDALOS proposal • Proactive approach: Ambient Network proposal • Summary • Proactive and distributed approach • QoS Signalling Overhead Evaluation • Conclusions 3 4 5

3. 1 Introduction

4. Heterogeneous network systems • Several wireless technologies are developed rapidly: • Static: wireless LANs (802.11), Bluetooth, UWB • Vehicle: 2/3 G cellular, broadcast TV/Radio new possibilities in providing wireless network access to nomadic hosts. • Wireless technologies differ in their: • Frequency bands • Requirements on mobility • Transmission speed and quality • Signalling protocols • QoS architectures

5. Problem issues in heterogeneous networks • Which radio technologies should a nomadic host chosen for its connection? It depends on: • Available resources • Supported mobility degree • Radio resource management • Services should be delivered seamlessly and in the "best" manner, over these various access technologies. • Providing QoS for such heterogeneous environment is a challenging task due to: • The diversification of implemented QoS mechanisms • The diversification of resource reservation mechanisms • The changes in radio access topologies and availability of resources

6. 2 Related work: QoS management in heterogeneous systems

7. Reactive approach:DAIDALOS proposal 1/2 • DAIDALOS network architecture overview

8. Proactive approach: Ambient Network proposal 1/2 • Ambient Network network architecture overview

9. Summary 1/2 • DAIDALOS adopts a Reactive QoS negotiation approach. • Concept: • Phase 1: mobility manager decides which is the most appropriate PoA for handover and triggers the handover execution. • Phase 2: host starts QoS negotiation process with the QoS broker to request more resources. • Problems: • QoS negotiation cannot be initiated before the mobile node switches to its new PoA. • E.g. if QoS negotiation established with new PoA fails, while it would succeed with another candidate PoA, that unsuitable PoA has been dropped from candidate list during interface selection phase. • Ambient Network adopts a Proactive QoS negotiation approach. • Concept: establish dynamic negotiation of service level specifications agreements. • Problems: • Network resources are used intensively (QoS control message advertisements). • operator has great difficulty controlling its network resources.

10. Summary 2/2 • Proposed solution: • Concept: • Adopt proactive approach. • Integrate QoS negotiation into handover decision phase. • Distribute QoS decision parameters between several managers. • Advantages: • Reduce the QoS signalling overhead cost. • Allow operator controlling its network resources. • Increase the probability that user will be "the best connected". • Have low cost deployment.

11. 3 Proactive and distributed approach

12. Answerer entity OM Négotiation of C C : monetary cost N D N Sending partial score Négotiation of L, D and B RM L : network load B : available bandwidth D N D : transmission delay Négotiation of BER Sending partial score Négotiation of SNR PoA BER : bit error rate D N Sending partial score MN SNR : Signal to noise ratio Decision D N Proactive QoS negotiation mechanism

13. 4 QoS Signalling Overhead Evaluation

14. Evaluation Scenario Overview 1/2 • Goal: How QoS decision parameters can be distributed over the control entities in order to reduce the QoS signalling overhead introduced by QoS negotiation. • Scenarios: • Scenario 1: QoS decision parameters are stored at the core network level. • Scenario 2: QoS decision parameters are stored at the radio access network level. • Scenario 3: QoS decision parameters are stored at the user's terminal level.

15. Evaluation scenario Overview 2/2 • Measured metric: • Size of all messages necessary to achieve QoS negotiation during mobility scenario • Varied metrics: • WC: weight of a hop in the core network. • WL: weight of a hop in the local radio access network. • WW: weight of a hop in the wireless medium. • SNeg: the size of QoS data to be negotiated.

16. Results 1/4 • Size of QoS data to be negotiated

17. Results 2/4 • WW is varied:

18. Results 3/4 • WC is varied:

19. Results 4/4 • WL is varied:

20. 5 Conclusions

21. Conclusions • Issues: • Supporting QoS in heterogeneous wireless networks. • Coupling QoS mechanisms with mobility management. • Research works: • Convergence between QoS management and handover decision phase. • Proactive QoS negotiation scheme. • Future works • Analysis of negotiation mechanism in OPNET simulator.

22. Thank you for your attention! Questions?

23. Reactive approach:DAIDALOS proposal 2/2 • QoS management during handover scenario

24. Proactive approach: Ambient Network proposal 2/2 • QoS management during handover scenario

25. QoS management during handover scenario