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Multimedia communications over the Internet have undergone considerable growth in recent years thanks to various mature technologies. However, the well-known wireless standard IEEE 802.11 cannot provide adequate bandwidth and jitter for multimedia communications. In this paper, a dual-mode access scheme with QoS features is proposed to solve the asymmetric link problem resulting from the 802.11 distributed...
This paper proposes easily applicable distributed reputation-based policies to motivate users of a wireless community to share their Internet connection in a p2p fashion. The goal is the provision of free and good quality Internet access anytime and anywhere inside the community. We study general systems of users with different contribution and consumption profiles and show via an extensive simulation...
Correct estimation of the available bandwidth in overlapped WiFi WLANs environments is one of the essential functions for efficient network resource management and seamless mobile service provisioning of QoS-guaranteed realtime multimedia applications in future Internet. In this paper, we propose a cognitive passive estimation of the available bandwidth (cPEAB) by correct measurements of i) the proportion...
Because of the high cost of construction and maintenance of infrastructure-based networks, researchers have concentrated their efforts on studying wireless mesh/relay networks with lower cost and high scalability. Due to the demand for real-time multimedia communication in heterogeneous networks, IEEE 802.16 multi-hop mesh/relay networks with IEEE 802.11e WLANs for QoS support can be an effective...
In the wireless heterogeneous environment, to access the Internet ubiquitously, most of the devices are equipped with multiple radio interfaces. Through this way, the multi-homed node can attach to multiple access networks through one or more radio interfaces. However, this brings forth also a problem of how to select a proper interface and access network for an ongoing application on a user's device...
Supporting Quality of Service (QoS) in a core transport is an important feature of a next generation network. This feature not only enables real-time communication services such as Voice over IP (VoIP) and video telephony, but also helps create new applications. However, access gateway such as Packet Data Gateway (PDG) in IMS WLAN Interworking, located at the edge of an IMS core network, must inspect...
This paper reports on the results of service performance in FON network - Wi-Fi network where each hotspot has its owner, Fonero, who has priority in service, and the right to grant access to the limited number of visitors of his hotspot. Simulation model developed assuming that users in FON behave similar to the users in Wi-Fi, and taking into account service priority of Fonero. Results of simulation...
The pricing and charging mechanisms used in Next Generation Network (NGN) deployments will influence the profitability of network operators. NGNs present an opportunity for the success of service delivery platforms designed for IP multimedia communications, like the IP Multimedia Subsystem (IMS). Moreover, they present a platform for the delivery of a multitude of applications and services to users...
As a result of its success, Wi-Fi has been promoted as an access technology to provide full internet connectivity in the municipal area. Supporting application QoS by managing resource provisioning is an important challenge for wireless network operators. This paper proposes a traffic engineering model for managing a Voice over Wi-Fi service in a municipal area with stationary and mobile clients....
Nowadays, since devices can find more than one access point (AP) in wireless local area networks (WLANs), we are supposed to choose the access point which tends to provide the best performance based on the kind of usage for which it is specified. Currently, in order to select the most appropriate AP, computers utilize the received signal strength which is referred to as the signal strength strategy...
The co-existence and integration of different wireless networks will significantly advance the provision of ubiquitous and high-performance Internet services to mobile users. In this paper, we present HAWK, a real-world implementation of high performance heterogeneous wireless networks for ubiquitous Internet access. We have built a fully featured testbed comprised of different wireless networks,...
Wireless mesh networks are emerging as a promising access network architecture. In this work, we report on an extensive measurement campaign performed over an experimental WiFi-based mesh network, deployed in an office building environment. The measurements are focused on the performance of HTTP traffic. Results demonstrate the existence of an unfairness issue, whereby longer sessions achieve better...
Many homes now have an 802.11 wireless local area network (WLAN) with a high speed internet connection. 802.11e enhanced distributed channel access (EDCA) allows for traffic prioritisation over 802.11 WLANs which can allow for the QoS demands of the increasing number of multimedia applications on the home network to be met. Providing quality of service (QoS) for delay constrained video applications...
The following topics are dealt with: performance modelling; performance evaluation; routing mechanisms; broadcast mechanisms; distributed systems; parallel systems; service oriented architecture; trust management; agent computing; video communication technology; communication protocol; automatic network systems; advanced network systems; Internet computing; ad hoc networks; wireless sensor networks;...
The Internet access paradigm is changing and a wide range of overlapping radio access technologies, such as WiMAX, Wi-Fi, 3GPP UMTS/LTE and DVB-H, will soon be available to most users and their multi-access devices. Therefore, novel mechanisms and protocols are needed to provide seamless mobility between different wireless access technologies. This paper presents novel handover procedures, based on...
In this paper we investigate the potential benefits of a selective delayed channel access algorithm (SDCA) for the future IEEE 802.11n based high-throughput networks. The proposed solution aims to resolve the poor channel utilization and the low efficiency that EDCA's high priority stations adhere due to shorter waiting times and consequently to the network's degrading overall end performance. The...
802.11 wireless local area networks are now common in the home. The 802.11e amendment allows for quality of service (QoS) provisioning over these networks to help meet the QoS demands of the growing number of multimedia applications on these home networks. The H.264 video coding standard is suitable for most multimedia applications due to its high compression and error resilience. This paper investigates...
Traffic evaluation is very important for wireless network planning. We should provide enough resources (channels) for conveying the traffic load. Next generation wireless networks are all based on IP. In this path, voice is also handled as VoIP. In this paper considering Eb/No, data rates, source activity factor and other cells interferences in a multi-user system, we first calculate the number of...
The use of Broadband Wireless Access (BWA) technology is increasing due to the use of Internet and multimedia applications with strict requirements of end-to-end delay and jitter, through wireless devices. The IEEE 802.16 standard, which defines the physical (PHY) and the medium access control (MAC) layers, is one of the BWA standards. Its MAC layer is centralized basis, where the Base Station (BS)...
Multimedia applications have been the key driving force in converging fixed, mobile and IP networks. A major hurdle in the realisation of this convergence is obtaining Quality of Service from a heterogeneous, best-effort service network. Interactive voice requires strict bounds on delay, jitter and packet losses, video adds significant bandwidth requirements to the network, while Internet only makes...
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