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In this paper, we proposes a cognitive cross-layer architecture for the cognitive ad hoc networks, where each node in the networks can sense and learn from wireless environment, network environment and user's requirements, and then it will respond the changes of environment by adapting system parameters and network services based on the learned results. In this way, it can provide the end-to-end goals...
Evolving device capabilities and network technologies make the seamless combination of personal area and wide area networks capable and desirable to exploit advantages of each of the environments. By this, the vision of adaptive and context-aware service provision becomes possible and offers new opportunities for pervasive computing. In this paper, we describe an approach that addresses the convergence...
The active TV concept offers solutions providing end users with easy access to new audiovisual services and applications from various terminals. A unique experience with new types of group interactions becomes possible in the form of advanced local and community services. To enable the delivery of such services with the required quality and security, active TV addresses the problem of pushing a part...
This work presents an effective cross-layer video streaming algorithm over mobile ad hoc networks. The proposed algorithm selects the most efficient PHY mode of IEEE 802.11 multi-rate service based on the information available at the application, MAC, and physical layers at each node in the distributed way in order to minimize end-to-end delay and remain packet loss rate in tolerable range at the...
Based on the concept of random contention and collision resolution, a distributed QoS-guaranteed multiple access (QMA) protocol for mobile ad hoc networks is proposed to support multimedia service and multihop architecture. In the protocol, nodes with real-time traffic have higher priority to access channel than those with non-real-time traffic by broadcasting forecast bursts (FB) in earlier group...
Providing QoS support is crucial to guarantee effective transportation of multimedia service for ad hoc network. In this paper, a QoS multicast routing algorithm with bandwidth and delay constraints was proposed. It utilizes genetic algorithm to search optimized multicast tree which satisfies the QoS requirement. The simulation results show that the algorithm has fast convergence and high routing...
Mobile ad hoc network (MANET) is a collection of mobile nodes that can communicate with each other without using any fixed infrastructure. To support multimedia applications MANETs require an efficient routing protocol and quality of service (QoS) mechanism. Node-Disjoint Multipath Routing Protocol (NDMR) is a practical protocol in MANETs: it reduces routing overhead dramatically and achieves multiple...
Multimedia data communication in mobile ad hoc networks involves link un-stability and link-failures. So the existing design of routing protocols failed to achieve a stable QOS. In this paper, we developed an ant colony-based routing protocol for multimedia communications in mobile ad hoc networks. The routing protocol first establishes multiple paths between the source and destination of a data session...
The phenomenal growth rate of voice over IP applications is fueling the demand of bridging the gap between real-time QoS guarantees and QoS in ad hoc networks. Multimedia applications are designed for stable networks, with unstable mobile ad-hoc networks presenting a challenge for such applications. Real-time applications require mechanisms that guarantee bounded delay and delay jitter. This paper...
Video capture and transmission play an important role in mobile ad hoc network (MANET) applications, and the routing protocol has vital impacts on the design of network performance. In this paper we designed and achieved an embedded video capture and transmission system which used an improved routing protocol AODV-SBR (AODV-simple backup route). The results indicated the video transmission system...
Overlay multicast has gained much attention in recent years as an alternative method to network layer multicast, especially for mobile ad hoc networks(MANETs). In this paper, we propose a new overlay multicast protocol to achieve simplicity of deployment, rapid adaptation of overlay structure when nodes move, and reduced delay. In our algorithm, to join or leave a multicast group, it is only sufficient...
As wireless local area networks (WLAN) become ubiquitous and an integral part of data networks, they will also be increasingly used for applications ranging from standard Internet services like ftp to time bound multimedia applications, such as Voice (or Video) over IP (VoIP/VIP), HDTV etc. with strict latency, throughput or jitter restrictions. These applications on WLAN will also be more bandwidth...
Supporting multimedia quality of service (QoS) is a necessary and critical requirement for next generation wireless networks. Wireless Mesh Networking is envisioned as an economically viable paradigm and a promising technology for supporting multimedia QoS. The non-mobile mesh routers with the capability of having less-constrained transmission power are the distinct characteristics for this type of...
We propose a new scheme for multiclass packet scheduling which is a variant of EDF (earliest deadline first). The model corrects EDF domino effect in a nearly-overloaded system. Simulations results show that the proposed model performs better than classical EDF by enhancing QoS for soft-real time traffic without significant degradation of less constrained traffic.
It is well-known that TCP has difficulty in achieving desirable levels of performance in multi-hop ad hoc networks. TCP implements a loss-based congestion control mechanism for adjusting traffic in the networks. However, when TCP reacts to a loss event in a multi-hop ad hoc network, contentions raised in the IEEE 802.11 MAC layer among nodes usually becomes excessive. This problem eventually induces...
Over the last few years, multimedia content sharing through different service providers have gained popularity among the Internet users. The development of wireless mobile devices with enhanced features have further fueled this phenomenon. While such content sharing in Internet is accommodated through an overlay architecture, for infrastructure-less environment such as wireless mobile ad hoc networks...
The rapid growth of high-speed multimedia services for mobile, residential and small business customers has created an increasing demand for last mile broadband access. The wireless broadband connectivity to the Internet is becoming increasingly available as an alternative to traditional wired technologies in cities across the globe and have the potential to fulfill the vision to high-speed broadband...
This paper describes the identification of potential problems with ad hoc routing protocol that contribute to the overall performance. Another major factor that contributes to routing protocol performance is when wireless nodes move out of coverage area of the other nodes and thus lose connection, or the opposite, where other wireless nodes join the network while on the move and require a dynamic...
In wireless ad hoc networks, nodes are energy constrained. As they communicate far off destinations using intermediate relays, it may not be in interest of a node to expend its energy in relaying and consequently reducing its own lifetime. On the other hand, if all nodes decide not to always accept relay requests, the network throughput will drop dramatically i.e., the lifetime of the whole network...
IEEE 802.11 protocol has found wide acceptability in the past few years, especially in embedded devices. Some of the embedded devices supporting 802.11 interfaces are voice and video-based devices like cordless phones, music players, camcorders, etc. These devices work in ad-hoc mode of operation for a number of applications. Such applications have some mandatory requirements that require one to determine...
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