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Guaranteeing quality of service is a key problem to multimedia stream in mobile Ad Hoc networks. The related works study the channel delay and bandwidth based on the MAC layer; however, there is little focus on queue delay. In a mobile environment, the changing of queue is quite different from those in static conditions. How to calculate the queue delay is a challenging question in mobile Ad Hoc networks...
An admission control Algorithm must organize among flows and should afford assurance of how the medium is shared between nodes. In a wired network, nodes can keep an eye on the medium to see how much bandwidth is being used by the network. On the other hand, in an Ad-Hoc network, during communication nodes possibly will use the bandwidth of neighbouring nodes. Consequently, the bandwidth consumption...
The design of a routing protocol for the provision of quality of service (QoS) in a mobile ad hoc network is a challenging task. In this paper, we propose a QoS routing protocol based on path durability and end-to-end delays. Our protocol tries to identify multiple node-disjoint paths between a given source and a destination. The path selection mechanism employed in our protocol selects paths that...
This paper proposes a novel channel allocation method for multi-cells OFDMA-FDD networks with a reused frequency factor (RFF) of one. The proposed algorithm predicts the co-channel interference (CCI) of active mobile stations (MSs) before allocating suitable subcarriers to a new MS. In order to maintain a desired quality of service (QoS) of the network, only subcarriers having signal-to-interference-plus-noise...
Without any pre-existing fixed network infrastructure with rapid configuration of wireless connections on-the-fly, network topology in MANETs keep on changing rapidly. Thus achieving data transmissions between wireless nodes in MANETs with improved QoS parameters become a challenging issue. To achieve this one has to concentrate on the routing protocol they choose. In our paper we proposed an algorithm...
Mobile Ad Hoc Networks (MANET) is a kind of network in which all the nodes can move randomly. As a new wireless communication network, MANET has attracted broad attention in recent years. But traditional distributed routing algorithm, which focuses on nodes, is complicated and huge in computation quantity, causes decline in performance of real-timing, throughput, ETE delay, network QoS, and etc. So,...
In this paper, a centralized polling-based medium access (MAC) scheme, namely, the IEEE 802.11e hybrid coordinator function (HCF) controlled channel access (HCCA), is considered as an alternative to the current MAC protocol used in IEEE 802.11p for Wireless Access in Vehicular Environment (WAVE). At first, the limitations of the current enhanced distributed channel access (EDCA) are examined, and...
IEEE 802.15.4 is the emerging next generation wireless standard designed for low-rate wireless personal area networks (LR-WPAN), which suit wireless sensor networks applications. It attempts to provide a low cost, low power and short range wireless networking. The QoS is more challenging in heterogeneous wireless sensors networks, where a diverse mixture of sensors for monitoring temperature, pressure,...
The emerging IEEE 802.16e Broadband Wireless Access (BWA) network is one of the most promising solutions to provide ubiquitous wireless access with high data rates, high mobility, and wide coverage. In the paper we develop a novel Connection Admission Control (CAC) algorithm for IEEE 802.16e mobile BWA networks to simultaneously improve the utilization efficiency of network resources and guarantee...
Mobile ad hoc networks are self organizing multi-hop wireless networks with no fixed infrastructure. All the users in these networks are mobile. The mobiles communicate either directly or via other nodes of the network by establishing routes. The mobility of nodes causes the existing links to be break frequently. So if we can predict future movement, the resources reservation can be made before be...
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...
Recent advances in wireless communications technology and low-power, low-cost CMOS imaging sensors enable a new sensing modality employing ubiquitous distributed video sensing. In many video sensing applications multimedia streams are often required by the base station to provide detailed information of the target spot in the sensor field. However, limited bandwidth, unstable network environment,...
In order to effectively monitor the application of the network performance and service quality, rapidly response users' needs and complaints, telecom operators find that the demands for service quality are in an urgent case. According to the requirement analysis on quality monitoring for streaming media service, together with the characteristics of stream media transport protocol, this paper introduced...
We present a novel mobile Ad Hoc networks routing protocol called state-aware routing protocol, in which more QoS metrics are taken into account during the route discovery, to decrease the end-to-end delay and transmission cost. When the source initiates a RREQ message, the forwarded nodes require considering the information of energy, mobility and congestion state, hence the destination would determine...
In sparse mobile sensor networks, nodes have a small number of neighbors with intermittent connectivity. This paper presents a new networking protocol for this type of network, aimed at maximizing system performance in terms of both delay and reliability. The system is motivated by the observation that many applications on this type of network have two kinds of co-existing data packets: those with...
Wireless Sensor Networks (WSN) now advance into areas where new scenarios and applications require WSNs to meet certain Quality of Service (QoS) requirements. To tackle these challenges, a routing approach has to consider limited energy supply of sensor nodes, dynamic network conditions as well as node mobility. This paper presents QoS-AODV6E, a routing scheme based on the Ad-hoc On-Demand Distance...
Contract-less wireless plans, in which customers are not locked into terms with providers, are becoming prevalent. The next step in this evolution is a contract-less competitive mobile wireless market in which a customer can, quite fluidly and seamlessly, choose to switch amongst wireless providers based on competitive terms at almost any time or place. This paper explores the concept and design of...
Vehicle-to-vehicle wireless communication is a key component of tomorrow's cooperative safety applications. However, the wireless link is susceptible to effects such as shadowing which can cause communication failures. Such failures may in turn lead to hazardous traffic situations when safety applications cease to function. By monitoring communication QoS and adapting to changes, effects of link failure...
An appropriate vertical handover process is the essential requirement for seamless mobility in heterogeneous wireless networks. The role of the handover process is to select the best target network. Several factors such as number of decision parameters and their relationships affect the handover decision. Little attention has been given to the understandability and modifiability of the decision model...
The increased efficiency of video compression algorithms, the improvements registered in reliability, data rates and quality of service of wireless transmission technologies, and the development of mobile multimedia terminals have made possible the implementation of Free-Viewpoint Video (FVV) technology on mobile platforms. The mobile environment however presents several restrictions. Two of these...
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