a proactive and distributed qos negotiation approach for heterogeneous environments
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NGMAST 2008
A Proactive and Distributed QoS Negotiation Approach for Heterogeneous environmentsAnis Zouari, Lucian Suciu, Jean Marie Bonnin, and Karine Guillouard
18/09/2008
NGMAST 2008 p2
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
NGMAST 2008 p4
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
NGMAST 2008 p5
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
NGMAST 2008 p7
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
NGMAST 2008 p8
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
NGMAST 2008 p9
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.
NGMAST 2008 p10
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.
NGMAST 2008 p12
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
NGMAST 2008 p14
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.
NGMAST 2008 p15
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.
NGMAST 2008 p21
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.
NGMAST 2008 p23
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
NGMAST 2008 p24
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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