Informatics Publishing Limited

K. Ponmozhi ¹, R. S. Rajesh ²

Affiliations
1 Mother Teresa Women's University, Kodaikannal, IN
2 Computer Science and Engineering Department, Manonmaniam Sundaranar University, Tirunelveli, IN

Abstract

Traffic carried by wireless networks may be a mix of real-time traffic such as voice, multimedia, messaging and file transfer and applications on them requires service/resource sharing. Each application will require varying and very diverse QoS guarantees. The cross layer design can potentially solve some of these problems in wireless communication and thus the provisioning of QoS level required by the applications. Layering of MANETs may be violated in order to implement autonomic behavior such as service provisioning. This cross layering depends on correlating data from various layers to identify major and relevant events related to the application design requirements. We proposed cross layer which lies between the application and the lower layers also it spans across the other layers vertically. In this paper the mechanism for accessing the cross layer information has been proposed and predictors to predict the event happening based on the collected data. The application or the other layers can access these values and do adaptation to the existing environment by subscribing to the needed predictors. We designed predictors namely data rate predictor, Bandwidth estimator, and Link qualification. To show case our design the routing algorithm has changed to take in to consideration of the link, and SNR which shows better result.

Keywords

Cross Layer, Mobile Ad Hoc Networks.

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K. Ponmozhi ¹, R. S. Rajesh ²

Affiliations
1 Department of Information Technology, Hajee Karutha Rowther Howdia College, IN
2 Department of Computer Science and Engineering, Manonmanium Sundarnar University, IN

Abstract

Service discovery technologies are exploited to enable services to advertise their existence in a dynamic way and can be discovered, configured and used by other devices with minimum of manual efforts. Automatic service discovery plays an important role in future network scenarios. Service discovery in distributed environment is difficult that too if the availability information of the services cannot be in a centralized node. The complexity is increased even further in the case of MANETs in which there will not be central intelligence also, the nodes involved may be on the move. The mobility issue leads to the situation of uncertainty about the service availability of the service provider. In this paper we propose a decentralized discovery mechanism. The basic idea is, distributing service information along with the availability metrics to the nodes. The metrics will give us the information to evaluate the goodness of the service provider. Every node will form multi-layered overlays of service providers sorted based on the metrics. When we send a query, each node will identify the service provider from the overlay with the good metric among the available providers (i.e.) the one in the first position in the overlay. We define the message structures and methods needed for this proposal. The simulation result shows that in the high mobile environment too we could have a better convergence. We believe that the architecture presented here is a necessary component of any service provision framework.

Keywords

Mobile Ad Hoc Networks, Service Discovery.

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