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Browsing Academic & Scientific Articles by Subject "Ad hoc networks"

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    AdSIP: Decentralized SIP for Mobile Ad hoc Networks
    (CERIST, 2011-12) Nouali-Taboudjemat, Nadia; Belhoul, Yacine; Yahiaoui, Saïd
    SIP (Session Initiation Protocol) is an IETF signaling protocol designed to create, modify and terminate sessions between two or many users in multimedia applications. The implementation of SIP needs the use of proxy servers which are centralized entities to route SIP requests and responses to enable user endpoints to discover each other. However, the infrastructureless of ad hoc networks requires that the network nodes support the tasks of participants’ discovery and SIP routing messages. In this paper, we propose the AdSIP protocol which is a completely distributed architecture for SIP that implements the proxy servers in selected nodes. The proxy servers are selected using a distributed algorithm constructing a connected minimal global offensive alliance. AdSIP is implemented and compared under NS-2 with another protocol which uses a cluster based approach. The simulation results show the advantages of AdSIP and demonstrate that it is adapted to mobile ad hoc networks by giving low session establishment time, low control overhead and high service availability.
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    Extending the AODV Protocol to Provide Quality of Service in Mobile Ad hoc Networks
    (CERIST, 2011-03) Bouchama, Nadir; Nouali-Taboudjemat, Nadia; Maouchi, Houari
    Voice communication is the most needed application in disaster management. However, without good QoS tuning, its performance can be poor. QoS routing is one of the most important building blocks in any given QoS solution. To conceive a QoS routing protocol for ad hoc networks, we can either conceive a new protocol from scratch, or extend an existing best effort protocol like AODV (Ad-hoc On-Demand Distance Vector Routing Protocol). The main advantage for the second approach is its easiness. In this paper, we propose a new QoS routing protocol that can satisfy multimedia application requirements in ad hoc networks. Thereafter, we present and discuss simulation results obtained under the NS-2 simulator for a VoIP application.