The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The following topics are dealt with :optical communication networks; intelligent transportation system; optical communication device; wireless vehicular networks; optical transmission; cloud computing; quantum cryptography; satellite communication; mobile ad-hoc and sensor mesh networks; mobile communication; quality of service; WLAN and mobile WiMAX; RFID; OFDM; ultrawideband communication; network...
In military communication environments, most mission-critical data should be guaranteed to be delivered to their corresponding targets in time even sacrificing the quality of services (QoSs) for existing non-mission-critical flows. This preemption capability is one of the most required features for the operation of tactical networks. And, it can be achieved by sacrificing QoSs for traditional class-based...
A new Virtual Base Station (VBS) election technique is proposed by this paper to help in QoS provisioning in the infrastructure-less Mobile Ad-hoc Networks referred to as MANET. This VBS election technique is based on the mobile node's Signal-to-Noise Ratio (SNR) and has been applied on the MANET's hybrid routing protocol: The Zone-based Routing Protocol. The developed routing protocol will be referred...
Mobile ad-hoc networks (MANETs) are adaptive and self-organizing, and as a consequence, securing such networks is non-trivial. Most security schemes suggested for MANETs tend to build upon some fundamental assumptions regarding the trustworthiness of the participating hosts and the underlying networking system. If MANET is to achieve the same level of acceptance as traditional wired and wireless network...
IEEE 802.11p is an emerging standard intended to support wireless access in the vehicular environment and to deliver both safety and non-safety applications to vehicles on the roads. Despite the numerous research works related to the design of reliable and timely dissemination of safety messages among vehicles, only a few works have investigated on-the-road delivery of non-safety data traffic, such...
The recent advances in wireless technologies and ubiquitous computing have driven an immense interest in mobile ad hoc networks (MANETs). However, the performance of MANETs is highly affected by the behaviour of its constituting nodes, which must cooperate in order to provide the basic networking functionality. So to remove the problem of misbehaving node affecting the behavior of MANET, We present...
Mobile ad-hoc networks are composed of heterogeneous mobile systems. Securing their communications may be difficult due to differences in the supported algorithms and protocols. In this paper we propose a protocol to negotiate security settings for the communications. This protocol aims at minimizing the power consumption and at providing the highest possible security level associated with the communications.
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...
Quality of service (QoS) is an important issue in delay tolerant mobile ad-hoc networks (DTMs). This work attempts to improve the QoS in DTMs by relying on spanning forests algorithms. The existing algorithms are improved by introducing the notion of trust and choosing the most robust (trustable) spanning trees among existing opportunities. The robustness/quality of the tree can be assessed based...
The task of finding and sustaining routes in mobile ad-hoc networks (MANETS) is an important factor in determining the efficiency of any MANET protocol. MANET characteristically comprises of wireless mobile hosts whose communication with each other is devoid of any fixed infrastructure. Absence of fixed infrastructures and host mobility thus constitute frequent unpredictable topological views. Positional...
Modern mobile ad-hoc networks (MANETs) frequently consist of nodes which exhibit a wide range of autonomy needs. This is particularly true in the settings where MANETs are most compelling, i.e. battlefield, response & rescue, and contexts requiring rapid deployment of mobile users. The time-critical nature of the underlying circumstances frequently requires deployment of both manned and unmanned...
The presence of delay-sensitive traffic in QoS-aware MANETs (mobile ad-hoc networks) results into increased TCP spurious timeouts, thus wasting their scarce bandwidth. Furthermore, the different dynamics used by a routing protocol in discovering and maintaining routes have a significant impact on TCP and MANETs in general. In this paper, we investigate the combined effect of contention- induced spurious...
The design of QoS routing protocol for mobile ad hoc networks is a challenging issue. In selecting the most optimal route from source to destination, one has to choose from a set of routes with the corresponding connectivity qualities. This paper describes the QoS routing scheme, that select a source-destination route using genetic algorithm (GA). The route need to satisfy the node bandwidth, node...
Historically, Error-Resilient (ER) video transmission and Super-Resolution (SR) image reconstruction techniques have evolved separately. In this paper, we propose a coordinated application of ER and SR to enhance the resolution of image transmitted over mobile ad-hoc networks. In order to combat error propagation, a flexible multiple description coding method based on shifted 3-D SPIHT (3-D Set Partitioning...
Cooperative diversity is a form of distributed spatial diversity achieved by cooperative communication among mobile users in cellular or wireless data networks. The problem of selecting suitable partners for a cooperative strategy is more complex when prospective partners have links of dissimilar quality to a central destination, leading to the possibility of non- reciprocal cooperation. We analyze...
Multicast routing is establishing a tree which is rooted from the source node and contains all the multicast destinations. A multicast routing tree with multiple QoS constraints may be the tree in which the delay, delay-jitter, packet-loss and bandwidth should satisfy the pre-specified bounds. This paper presents a hierarchical QoS multicast routing protocol (HQMRP) for mobile ad-hoc networks. It...
An ad-hoc network is a network whose particular characteristics include absence of any kind of infrastructure, dynamic topology and limited resources. Up to day, several routing protocols have been proposed to face such a hostile environment. These solutions usually provide to the sources of data flows with single valid paths towards their destinations. However, it has been proven that maintaining...
Estimation of trust in ad-hoc networks is an inevitable basis for hybrid networks to inter-operate. The contributions in this paper provide a framework for estimating the trust between nodes in an ad hoc network based on quality of service parameters. Probabilities of transit time variation, deleted, multiplied and inserted packets, processing delays are used to estimate and update trust. Functions...
Providing QoS in mobile ad-hoc networks (MANETs) is necessary to allow effective communication in context of multimedia data transmission. Reserving the required resources and applying an admission control mechanism is one way to guarantee end-to-end QoS. Nevertheless, such a scheme should take into account the problem of interferences, consequent to the use of the wireless channel. Much work have...
A mobile ad-hoc network (MANET) is kind of self-configuring wireless network. Mobile terminals move freely, randomly, organize themselves arbitrarily hence network topology changes rapidly and unpredictably. Due to these properties quality of service (QoS) of MANETs changes frequently. To solve this problem, connection admission control (CAC) algorithms are applied. These algorithms are trying to...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.