A Glance at QoS Models in Mobile Ad Hoc Networks Navid NIKAEIN Christian BONNET Keywords: Manet, QoS, QoS Model, DiffServ, IntServ, FQMM, Routing, Metrics, Cross-Layer

Outline Introduction Motivation Manet and QoS Classical QoS Models A Cross-Layer QoS Model for Manet Conclusion

Introduction Packet Radio::Multihop::Manet Routing/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 & FQMM Require accurate link state and topology information The 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 Model A 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 quality ALMs select one path which is more likely to meet application requirements Adapt 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

Architecture Network Quality: Stability/ Power/buffer App. Requirement QoS Class D T B-E QoS Extension Application Layer Network Layer 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 Manet QoS that an application requires depends strictly to the quality of network Cross-layer QoS models respond to both network & application requirements

A Glance at QoS Models in Mobile Ad Hoc Networks Navid NIKAEIN Christian BONNET Keywords: Manet, QoS, QoS Model, DiffServ, IntServ, FQMM, Routing, Metrics, Cross-Layer