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We present in this paper a multi-layer scheme for QoS Management in MANETs. Our proposal is to combine multiple communication protocols of different layers, to provide an adapted QoS to a different traffic classes. Protocols are modified to improve their awareness of the quality of service, so that new extensions with QoS support are developed. We model QoS service at routing layer, via a QoS extension...
Covert channels aim to carry information in a way prohibited by the security policy and can be used to bypass censorship (e.g. by journalists). To establish secure covert channel communications, overlay networks with internal control protocols can be built. We present a design method for control protocols within covert channels. Our protocol design provides the advantage of space-efficiency (in comparison...
Satellite network is an important part in the future communication system and the routing design is always the bottleneck. Since the satellite technology constantly develops and the requirement of ground terminal grows, the routing technology in satellite networks is renovating all the time. In this paper various routing algorithm are analyzed. The routing problems concerning dynamic topology networks,...
Many applications in the Internet today demand high end-to-end Quality of Service (QoS) assurance, such as bandwidth, delay, jitter and packet loss constraints. Also they seek better utilization of the network resources, while satisfying customer needs. Multi-constrained optimal path (MCOP) QoS routing problem attempts to find a feasible path that satisfies the requested QoS constraints, while maintaining...
Many receivers driven cumulative layered multicast congestion control protocol such as RLM, RLC and FLID-DL used for multimedia application. However, these protocols are suffering with problem of congestion during IGMP leave latency leading to switching between overloading and under loading network state which can't utilize bandwidth so that quality of service gets degraded. To overcome of these problems,...
DCUR follows the same procedure as define in Bellman-Ford but uses two vectors, namely least cost and least delay vector. The main drawback of DCUR is its assumption of link costs. It means that the minimum cost path is more often chosen and therefore the load distribution is not fair for the minimum cost paths. In this paper we propose a way to modify the cost and delay metrics dynamically in the...
The increasing use of multiparty Web conferencing applications demands for suitable multicast protocols. Limited bandwidth of typical Internet user requires the underlying multicast routing to be efficient. In this paper we present HOMA; an application layer multicast protocol which has been tailored for small scale multiparty videoconferencing applications. Considering the requirements of such applications,...
Designing quality of service (QoS) guaranteed communication protocol for wireless sensor networks (WSNs) is essential to exploit the advantages and flexibilities offered by this technology for real-time control and actuation applications. A novel cross-layer protocol that embraces altogether a semi-random routing, MAC, data aggregation, and radio power control for clustered WSNs is presented. The...
Network on chip (NoC) has emerged as the design paradigm for scalable System on Chip with harsh bandwidth requirements. However, current NoCs remain not flexible enough to support communication dynamic behaviors (size, instances) inherent to a growing majority of embedded systems. Few solutions have been proposed to make NoC reconfigurable using different methods but,to the best of our knowledges,...
This paper proposes a heuristic algorithm to construct a shared-route in multicast routing networks that provide communications between multi-users such as IPTV, remote educations/health, and internet broadcasting. The measures of maximum delay, average delay, estimated delay between nodes are adopted for performance analysis. The performance of algorithm is compared with the optimal solution in which...
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
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