Quality of service adaptation in mobile ad hoc networks

Authors:
Ronan De Renesse;Piyush Khengar;Vasilis Friderikos;A. Hamid Aghvami
Affiliations:
Centre for Telecommunications Research, King's College London, London, UK.;Centre for Telecommunications Research, King's College London, London, UK.;Centre for Telecommunications Research, King's College London, London, UK.;Centre for Telecommunications Research, King's College London, London, UK.
Venue:
International Journal of Sensor Networks
Year:
2008

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Abstract

Mobile Ad Hoc Networks (MANETs) use hosts as routers to forwarddata from source to destination, thus, avoiding the need for aninfrastructure. Due to the unreliable nature of the shared wirelessmedium as well as risks of route failure (due to mobility),supporting Quality of Service (QoS) in ad hoc networks is a ratherchallenging task. QoS routing is used to find paths that cansupport QoS requirements, based on network information acquiredduring the route discovery process, and/or using periodicmonitoring. If the QoS demand goes beyond the network capacity, thecall admission procedure generally rejects any incoming QoSrequest, thus, avoiding the quality deterioration of existing QoSflows. However, channel conditions are likely to change and mightthreaten QoS provision at any time. Therefore, a strategy is neededto reinstate QoS guarantees when at risk. Whenever best-efforttraffic deterioration is not applicable or useful, a QoS flow hasto be sacrificed for the sake of others. The selection of thevictim QoS flow expresses a need for conflict resolution policies.This paper is divided into two distinct parts. We quantitativelyassess the risk for QoS deterioration in MANETs in the first part.Then, in the second part, we propose and simulate various QoSconflict resolution strategies in order to tackle QoS degradationin the most efficient way.