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.
Fiber-Wireless (FiWi) access networks, have rapidly matured as a last mile Internet access network solution due to their novel combination of Ethernet Passive Optical Networks (EPON) as a backhaul and Wireless Mesh Networks (WMN) as an access network. The high bandwidth provided by the optical lines, as well as the flexibility offered by the wireless network, offers a great degree of cost-efficiency...
A multichannel scheduling based on an extension of modified largest weighted delay first (M-LWDF) scheduling is proposed for heterogeneous traffic. We consider the downlink of an orthogonal frequency division multiplexing (OFDM) system where the wireless channel and queue state information are taken into account to schedule delay-sensitive and ratesensitive traffic. We propose a logarithmic notion...
This paper studies the multihop packet delivery delay in a low density vehicular ad hoc network (VANET). We address a disrupted vehicle-to-infrastructure communication scenario, where an end-to-end path is unlikely to exist between a vehicle and the nearest road side unit (RSU). We present an analytical framework, which takes into account the randomness of vehicle data traffic and the statistical...
In a wireless domain where a mobile user accesses heterogeneous wireless technologies with multiple interfaces, a multi-path scheduling algorithm can benefit mobile users' experience by aggregating different network bandwidth together. However, existing literature actually shows that for TCP flows, it may not be the case. To better exploit multi-path scheduling for TCP connections, this paper presents...
We discuss protocols for all-to-all dissemination in ad-hoc wireless networks. We identify shortcomings and challenges related to high traffic and explore their causes by observing the performance at the MAC layer. Through simulations we show that a congestion assessment mechanism can reduce more than 1/4 of the traffic on a good part of the nodes without affecting dissemination performance. We conclude...
The recent trend in Internet traffic indicates the proliferation of usage of multimedia services where a substantial part is related to some sort of video transmission. Moreover, an increasing number of Internet users employ wireless access technologies. High-quality video streaming over wireless access in unison with great mobility brings challenges to sustain the mobile user perceived video quality...
Heterogeneous wireless network (HWN) technology has emerged as an important option for the next generation mobile network, where mobile client (MC) are capable of simultaneously connecting to multiple access networks for better quality of services (QoS) at a lower cost. Different from a conventional HWN that uses a single connection and performs vertical handover, we observe the performance of MCs...
The area of mobile ad hoc networking has gained widespread interest of the network research community in recent years because of the ability of the MANETs to provide truly distributed and decentralized communication facility on ad hoc basis. But due to the bandwidth constrained links and limited transmission range of the mobile nodes, MANETs suffer from the inability to cover a wider network area...
In this paper we develop an optimized control strategy for the connection bandwidth maximization over a time varying wireless channel, by jointly controlling the adaptive source rate and the client/playout buffering policy with constraints on the maximum connection bandwidth allowed at the Application (APP) layer, the queue-capacities available at the DataLink (DL) layer and the average and peak transmit...
Traffic aggregation in large-scale and multi-hopping wireless sensor networks (WSN) can generate a high load on some intermediate nodes that are close to the access point (sink) due to packet relaying, especially in complex in-door environment. This can result in over-burdened sensor nodes exhausting their batteries resulting in more frequent need replacement. This paper studies the characteristics...
Heterogeneous wireless network (HWN) technology enables a mobile client (MC) to access multiple heterogeneous subnets for better quality of service (QoS) at a lower cost. In the context of conventional network protocol, we cannot fully utilize the potential of a HWN by having separate and independently operating subnet interfaces. In this paper, we propose a multi-MAC management scheme, performing...
One of the most critical problems in multihop wireless networks is the fair allocation of bandwidth among different nodes. Although there are significant researches on the fairness issues in single-hop wireless networks, research on multihop fairness rarely found in the literature. A user in multi-hop network, besides the contention with other nodes to obtain the channel in physical layer, must find...
Vehicular networking is nowadays considered as one of the most important enabling technologies as it allows vehicles to communicate with each other (vehicle-to-vehicle (V2V) communication) and/or with roadside infrastructure (vehicle-to-infrastructure (V2I) communication). Vehicular ad hoc networks (VANETs) are ideal candidates for supporting various types of traffic applications, such as traffic...
Next Generation Wireless Systems (NGWS) include co-existence of current wireless technologies such as WLANs, WiMAX, General Packet Radio Service (GPRS) and Universal Mobile Telecommunications System (UMTS). The important and challenging issue in NGWS is seamless handoff during the mobility of mobile node between different integrated networks. In this article, we propose a received signal strength...
By theoretical analysis, we discuss the performance of random access protocol by network coding in wireless relay networks. We present a novel method to increase the opportunity of network coding in relay node. By using this method, the performance of random access protocol in wireless networks can be improved especially in low traffic load. We compare the performance of this method with network coding...
Popular wireless network standards, such as IEEE 802.11/15/16, are increasingly adopted in real-time control systems. However, they are not designed for real-time applications. Therefore, the performance of such wireless networks needs to be carefully evaluated before the systems are implemented and deployed. While efforts have been made to model general wireless networks with completely random traffic...
Currently, Transmission Control Protocol (TCP) is the dominant protocol used in the Internet. It is the transport protocol that is responsible for the transmission of around 90% of the Internet traffic. TCP was originally designed for wired network where packet loss due to congestion dominates. Mobile Ad Hoc Network (MANET), one of the wireless networks, has special characteristics which cause several...
Many schemes have been studied in the recent past facing the trade-offs between wireless mobility, the capacity impact and the Energy Conservation (EC) onto overall performance. Available resources should be supported by the effectiveness of the storing on-demand scheme along considering the EC of the wireless device. In this work there is a consideration of the diversity properties of the wireless...
Next generation wireless schedulers should exploit multi-user diversity not only by managing bandwidth among users experiencing different channel quality but also by exploiting traffic knowledge. A Traffic Profile and Priority-based Wireless Fair Queuing (TPP-WFQ) scheduling approach is proposed, which utilizes available bandwidth in the system to allow sessions experiencing poor channel quality to...
In this paper, an improved IEEE802.11 WLAN analytical model under unsaturated traffic conditions was proposed. It adapts Distributed Coordination Function (DCF) models to describe all the states. Compared with other MAC models, two special states were added for this model. One is D state meaning whether the medium is sensed to be available for a time interval greater than DIFS, so the sender can transmit...
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.