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Ultra-Wide Band (UWB) wireless communication is a promising spread-spectrum technology with features of low cost, low power and high time resolution has potentially important applications in wireless ad hoc networks. This paper presents a novel quality of service (QoS) routing scheme for wireless multimedia ad hoc networks. Besides applying neighbor detection method in route discovery procedure, the...
Mobile tactical MANETs are subject to periods of intermittent connectivity and transient events of significant packet loss. Because of such disruptions, protocols and technologies have been proposed that are disruption and delay tolerant. One class of such systems works by storing messages/packets in the network. If connectivity to neighbors is lost, missing messages may be delivered when connectivity...
Wireless backhaul has been received much attention as an enabler of future broadband mobile communication systems because it can reduce deployment cost of pico-cells, an essential part of high capacity system. A high performance network in terms of high throughput, low average delay and low packet loss rate, is highly appreciated to sustain the increasing proliferation in multimedia transmissions...
Mobile business can only be used within the coverage area of the wireless networks at present. If there is some temporary utilization such as emergency business in disaster area and some conferences or link failure, the users cannot receive M-business services. Owing to the infrastructureless structure and self-organized feature of 4G system, this paper proposes 4G-based mobile business model supported...
The paper presents a new mechanism of hidden and secure data transmission in wireless IEEE 802.11 networks in military applications. The mechanism allows us to switch WLANs from infrastructure to the ad-hoc mode simultaneously changing transmission channels and scrambling fragmented data in the MAC layer. Optionally, we can take advantage of extra data encrypting using the VMPC algorithm.
Video and image communications can assist in highway traffic control, accident avoidance and management as well as road congestion control and coordination. This paper studies video streaming over wireless medium among a cluster of vehicles in an ad-hoc network. Through intense tradeoff study, we investigate the issues encountered in building a robust system that would allow automobiles to effectively...
Video streaming over wireless connections remains a challenge today: even when data link and transport layer protocols are tuned to avoid retransmissions and thus reduce the delay and the used bandwidth, the impact on the perceived video quality of imperfect and band-limited radio channels is not negligible. This phenomenon is even more pronounced in multi-hop ad-hoc networks, where the received video...
Ad-hoc Networks have been proposed for a variety of applications where support for real time, multimedia services may be necessary. In order to operate ad hoc networks several protocols, for media access control, power control, routing, and transport are needed. We take a holistic approach to the problems in ad hoc networks. We start by postulating general design principles for power control based...
With the development of recent vehicular communication technologies, distributing multimedia contents in the vehicular communication networks (VCNs) has become more and more popular, to provide conveniences and entertainment services during the time of driving. However, as multimedia contents are changed and updated dynamically, how to keep the consistency between the original and these replicas in...
Wireless mesh networks (WMN), with static wireless back-bone and multi-hop communication, as protocols typically employed in WMN are, for the most part, not designed for real-time communications. WMNs experimentation is subjected to stochastic factors such as channel contention, interference, node mobility and access latency add delay and degrade the quality of the stream, pose new design challenges...
Mobile Video on demand (VOD) system is that allows mobile clients to browse and watch videos anywhere and anytime. In this system, the video server employs staggered broadcasting protocol to disseminate video to mobile clients within the MANET environment. In this protocol, video is divided into small segments and are repeatedly broadcasted within server's channel in periodic basis. Clients can join...
The following workshops are given: performance modeling and evaluation in computer and telecommunication networks; wireless mesh and ad hoc networks; multimedia computing and communications; grid and P2P systems and applications; and convergence of heterogeneous wireless systems.
For MAC (Media Access Control) protocol not providing QoS(Quality of Service) guarantees. With the increase of multimedia sevices in wireless networks(for example:voice, video, etc), when the networks get crowded, real-time applications will decrease its performance. We proposed a wireless network algorithm for 802.11e, witch supports fixed nodes and mobile nodes, and also swiches and new connections...
In this paper, we present a fully distributed cross-layer algorithm with delay constraint in order to support real-time multimedia services in cooperative networks. The Network Utility Maximization problem is decomposed into congestion-contention control subproblem in the link layer and routing subproblem in the network layer. We design an End-to-end delay framework for modeling delay constraint in...
Distributed multimedia applications over mobile ad hoc network have a great potential in various scenarios. However, establishing ad hoc multimedia sessions is not simple given that ad hoc nodes are highly dynamic and resource-limited. For session control, the conventional SIP is not applicable since using a particular mobile endpoint as a server is unrealistic. Recently, several proposals on extension...
The emergence of multimedia applications demands multicasting in MANETs. For such applications QoS provisioning is a complex and challenging issue. This paper proposes a QoS aware multicast routing scheme uses a set of static and mobile agents and ensures QoS guarantees in terms of bandwidth reservation, delay constraint, delay-jitter constraint and packet loss to multicast session. Here the mobile...
User Datagram Protocol (UDP) is proposed for the efficient servicing of multimedia traffic flows in Internet and it does not make use of any congestion control mechanism. The Internet Engineering Task Force (IETF) is working on development of a protocol standard that is suited to the needs of multimedia applications, known as the Datagram Congestion Control Protocol (DCCP). DCCP combines the end-to-end...
The following topics are dealt with : computer networks; IP networks; optical transmission; ATM networks; WDM system; wireless LAN; high speed Internet; ad hoc networks; wireless sensor networks; heterogeneous networks; bluetooth technology; personal communication system; broadband communication; 3G and 4G networks; multimedia communication; CDMA system; OFDM technology; communication protocol; spread...
With the continuously increasing applications of multimedia communications in Ad hoc network, network is experiencing a serious congestion problem. This paper proposes a fuzzy based queue control method (FQCM for short) which applies fuzzy set theory to queue control to avoid congestion or to recover from congestion state rapidly. The proposed queue control method adjusts data loss ratio according...
Most of the currently deployed networks are typically dimensioned considering the “peak hour” traffic demand. Opportunistically utilizing these “excess” resources might be an effective way for improving utilization and lowering the “production” costs. This paper is proposing and evaluating a novel concept, called ActiveCast, and the corresponding architecture for a network and user behavior aware...
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