A Glance at QoS Models in Mobile Ad Hoc Networks

Navid NIKAEINChristian BONNET

Keywords: Manet, QoS, QoS Model, DiffServ, IntServ, FQMM, Routing, Metrics, Cross-Layer design.

@

http://www.eurecom.fr/~nikaeinn

Outline

Introduction MotivationManet and QoSClassical QoS Models A Cross-Layer QoS Model for ManetConclusion

IntroductionPacket Radio::Multihop::ManetRouting/QoS

s

d

Motivation Mobile ad hoc networks & QoS: Limited wireless resources low-

capacity Mobility time-varying topology Lack of infrastructure fully-distributed

Low-capacity time-varying resources with a fully mobile infrastructure

Quality of Service Definition

To provide a set of service requirements to the applications while Routing through the network e.g. end-to-end delay

Even Internet today, with high-speed high-quality fixed communication links, is unable to deliver guaranteed end-to-end services.

Quality of Service Model

Two examples in the wired Network: IntServ: per-flow end-to-end guarantee DiffServ: Per-class service differentiation

An example in Manet: FQMM: Flexible QoS Model for Manet

IntServ is used for high priority classes DiffServ is used for low priority classes

DiffServ & IntServ & FQMMRequire accurate link state and topology informationThe low-capacity time-varying resources make maintaining accurate link state and topology information very difficult

Quality of service that an application requires depends strictly to the quality of network

QoS Definition in Manet?

Has to be redefined !

To provide a set of parameters in order to adapt application to the quality of network while routing through the network e.g. Adaptive application, and soft

QoS

QoS in Manet

Parameters should represent: available resources low-capacity stability of resources time-varying

topology

Protocols should be: adaptive fully mobile infrastructure &

low-capacity time-varying topology and resources

A Cross-Layer QoS ModelA cross-layer model to deploy QoS: ALMs-- Application Layer Metrics NLMs-- Network Layer Metrics MLMs-- MAC Layer Metrics

MLMs & NLMs determine the quality of links to generate paths with good qualityALMs select one path which is more likely to meet application requirementsAdapt to the network quality if needed

class I, delay class II, throughput class III, B-E power level buffer level stability level

link SINR

Parameters

At network layer

At MAC layer

At application

layer

Mapping

PriorityClasses

ALMs NLMs MLM

Class I Delay buffer +hop #

SINR

Class II Throughput buffer +hop #

SINR

Class III Best-Effort Stability +hop #

SINR

Architecture

Network Quality:Stability/

Power/buffer

App. RequirementQoS Class

D T B-E

QoS Extension

ApplicationLayer

NetworkLayer

MAC Layer

Application Layer Metrics

Network Layer Metrics

Protocol Stack

Link Quality:Link SINRs MAC Layer Metrics

Outline

Mobile ad hoc networks/QoS

Classical QoS models: DiffServ & IntServ

New definition of QoS in Manet

A cross-layer QoS model that separates MLM, NLMs, and ALMs

Conclusion

Classical QoS models are not appropriate for ManetQoS that an application requires depends strictly to the quality of networkCross-layer QoS models respond to both network & application requirements

A Glance at QoS Models in Mobile Ad Hoc Networks

Navid NIKAEINChristian BONNET

Keywords: Manet, QoS, QoS Model, DiffServ, IntServ, FQMM, Routing, Metrics, Cross-Layer design.

@

http://www.eurecom.fr/~nikaeinn