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In this present work, we propose a scheduling approch for heterougeneous traffic over network. The proposed scheduling not only satiesfies the QoS requirements of the real time flows (class-1) but also continues providing best effort service to non real time flows (class-2). Many scheduling techniques have been proposed to respond to the temporal requirements of real-time jobs (flows). The technique...
Call admission control (CAC) functionality is a critical requirement for guarantee the desired quality of service (QoS) for voice calls in IP-based wireless networks. In this paper, three different CAC strategies for voice over IP (VoIP) traffic over wireless access networks with packet buffering are mathematically analyzed through a joint call and packet level discrete time teletraffic model. The...
In this paper we introduce a new network coding-based network protection strategies against link failure, which is based on prediction of data traffic. In the situation that extra backup links are not applicable, we assign protection packets to the path which would have a low traffic by the prediction. The simulation result shows that using the new strategy, the average queuing delay of packets can...
Low Earth Orbit (LEO) satellite networks are expected to provide a variety of multimedia applications. In order to satisfy different QoS requirements and optimize utilization of network resources, a novel traffic classification routing algorithm (TCR) is proposed. The key technique of TCR is investigating the traffic classification link-cost metrics (TCM) for different traffic classes, which selects...
We describe here a new burst scheduling algorithm to avoid burst overlapping in the egress router of optical burst switching (OBS) network, and hence to improve the quality of service (QoS) in developing several optical networks to fulfill the increasing demand of Internet facilities. We consider TAG (tell-and-go) protocol where many lightpaths pass in a given link and burst overlap may occur. In...
Integration of different network services into a converged infrastructure is one of the most intensive challenges in the converged network application development area. Huge differences exist regarding several characteristics of data, voice and video content traffics. While data traffic requires error free services, real time applications like interactive video transfer and VoIP distress of the high...
Qos provision is considered as the complex task due to the heterogeneous nature, diverse QoS requirements of emergent different applications. With the advent of high bandwidth 3G/4G technologies, like LTE, LTE-advanced, the necessity of QoS provision becomes even crucial. Uplink scheduling with QoS provision is considered here. The contribution of this work is uplink packet scheduling scheme maintaining...
Congestion control is vital in the streaming of a video sequence or clip, as network traffic varies unpredictably requiring constant adjustment of the transmission rate. Standard TCP-Friendly Rate Control (TFRC) wastes bandwidth and may react to congestion only when packet loss has already occurred. This paper presents a unicast transport protocol named RRB-SIMD for video streaming over the Internet,...
Congestion control mechanisms include three phases: congestion detection, congestion notification and rate adjustment. So far diverse congestion detection methods for sensor networks are proposed. In this paper we introduce numerous congestion detection parameters and examine them in various respects; finally we choose one of them as the best parameter for video traffic in wireless sensor networks...
Today's Internet is a massive, distributed network which continues to grow in size as globalization takes major role in everyone's life. The problem is complicated by the fact that one cannot rely on the cooperation of individual servers and routers to aid in the collection of network traffic measurements vital for these tasks. Packet Forwarding Priority can have a significant impact on the performance...
This paper proposes a learning approach to solve adaptive Connection Admission Control (CAC) schemes in future wireless networks. Real time connections (that require lower delay bounds than non-real-time) are subdivided into hard realtime (requiring constant bandwidth capacity) or adaptive (that have flexible bandwidth requirements). The CAC for such a mix of traffic types is a complex constraint...
We propose an efficient scheme for generating fake network traffic to disguise the real event notification in the presence of a global eavesdropper, which is especially relevant for the quality of service in delay-intolerant applications monitoring rare and spatially sparse events, and deployed as large wireless sensor networks with single data collector. The efficiency of the scheme that provides...
Vehicular ad-hoc networks will soon support a wide variety of inter-vehicle and vehicle-to-roadside applications. In many cases these networks will also co-exist with battery operated networks such as those deployed for sensor and mesh networked applications. In these latter types of networks, mesh node energy efficiency is often of paramount importance. This paper proposes improvements in mesh network...
One of the most popular applications of IEEE 802.16 network is to serve as a backhaul service for IEEE 802.11 networks. However, the traffic of an IEEE 802.16 connection aggregated from IEEE 802.11 networks fluctuates. Thus, efficient bandwidth reservation at the subscriber station (SS) is an importance issue. This study proposes a simple and flexible bandwidth reservation scheme at the SS, called...
The Quality of Service (QoS) support of multimedia services over wireless Mobile Ad hoc Networks (MANETs) is one of the hottest challenges facing todays research community working on this area. Most existing works on QoS in ad hoc networks has been carried out under the assumption that the underlying QoS architecture is reservation based. In such architecture, mobile nodes maintain per-flow state...
The MAC protocol is important, especially for wireless LAN because of limited bandwidth. A great deal of research has been carried out and some of proposed schemes are effective. Specifically, considerable effort has been devoted to improving the IEEE 802.11 standard which is utilized widely. Previous theoretical analysis gave the upper bound of IEEE 802.11 DCF throughput which is far below the channel...
This paper proposes a handover scheme supporting Multi-Protocol Label Switching (MPLS) in a Proxy Mobile IPv6 (PMIPv6) domain that improves the mobility and gives Quality of Service (QoS) and Traffic Engineering (TE) capabilities in a mobile MPLS access network. The proposed scheme takes advantage of both PMIPv6 and MPLS. PMIPv6 was designed to provide Network-based Localized Mobility Management (NETLMM)...
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...
We study the performance of cognitive (secondary) users in a cognitive radio network which uses a channel whenever the primary users are not using the channel. The usage of the channel by the primary users is modelled by an ON-OFF renewal process. The cognitive users may be transmitting data using TCP connections and voice traffic. The voice traffic is given priority over the data traffic. We theoretically...
Increasing demands of ubiquitous services in wireless networks and evolution towards heterogeneous solutions has driven the necessity of developing efficient QoS aware vertical handoff (handoff between different networks) mechanisms. This paper proposes a QoS aware fuzzy rule based vertical handoff mechanism that makes a multi-criteria based decision, found to be effective for meeting the requirements...
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