NGMAST 2008

A Proactive and Distributed QoS Negotiation Approach for Heterogeneous environmentsAnis Zouari, Lucian Suciu, Jean Marie Bonnin, and Karine Guillouard

18/09/2008

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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

1

2

3

summary

4

5

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1Introduction

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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

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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

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2Related work: QoS management in heterogeneous systems

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Reactive approach:DAIDALOS proposal 1/2 DAIDALOS network architecture overview

MN

CN QoSB

AN QoSB 1

BS 2BS 1

UMTS sub-domain

Access Network domain

Operator core network

WLAN sub-domain

WiMAX sub-doamin

AP1

BS2

AN QoSB 2

Access Network domain

AR AR

AR

MMSP

MMSP

PBNM

MMSP

MN

MN moves

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

MN

CN AQE

AN AQE 1

BS 1

Ambient network Provider

Operator core network

AP1 BS 3

AN AQE 3

Ambient network Provider

AN AQE 2

Ambient network Provider

BS 2

Ambient network Customer

MN

Ambient network Customer

MN moves

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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.

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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.

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3Proactive and distributed approach

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Proactive QoS negotiation mechanism

OM

D N

RM

D N

PoA

D N

MN

D NDecision

Answerer entity

NC: monetary cost

D: transmission delay

L: network loadB: available bandwidth

BER: bit error rate

SNR: Signal to noise ratio

Sending partial score

Sending partial score

Sending partial score

Négotiation of C

Négotiation of L, D and B

Négotiation of BER

Négotiation of SNR

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4QoS Signalling Overhead Evaluation

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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.

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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.

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Results 1/4 Size of QoS data to be negotiated

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Results 2/4 WW is varied:

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Results 3/4

WC is varied:

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Results 4/4

WL is varied:

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5Conclusions

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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.

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Thank you for your attention! Questions?

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

MNCurrent

ARCurrent ANQoSB

(2) QoS info

(3) RtSolPR

CNQoSBCandidae

ARCandidate ANQoSB

(4) HO Request

(7) PrRtAdv

(8) FBU

(9) FBAck

(10) FNA

(13) Inc Agg Res Req

(14) Inc Agg Res Dec

(15) Agg info(16) Agg info

(18) QoS flow Response

(12) QoS flow Request

(17) QoS flow Response

(11) QoS flow Request

(1) Collection of information about candidate AP + QoS

(5) HO QoS Decision(6) HO Reply + QoS info

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

MNCurrent ANAQE

Candidate ANAQE

CN AQE

(1) Advertise SLS

(2) Negotiate SLS

(3) Propose SLS

(4) Negotiate SLI

(5) Propose SLI

(6) Send Agreement

(7) Send Agreement

(8) Advertise SLS

(9) Send Agreement

(10) Send Agreement

Ho execution process

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QoS management during handover scenario

MNCurrent

ARCurrent

RM

(2) HO Needed Ind

OMCandidate

ARCandidate

RM

(1) HO Initiation Ind

(7) RtPrSol

(6) HO Needed Ind

(3) Nego Offer Req

(4) Nego Offer Rsp

(5) Nego Offer Ack

(8) PrRtAdv

(9) FBU

(10) FBAck

(11) FNA