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ICT and e-learning platforms provide an alternative channel for improving the quality of education and extending it to reach broader audiences. In this paper, we evaluate the quality of network traffic when video applications are being used in e-learning portal over Wi-Fi/WiMAX environment. We design a network testbed together with the e-learning portal and PRTG is used to monitor the traffic in Wi-Fi...
The number of wireless applications, services and devices such as mobile telephone handsets, laptops and personal digital assistant (PDAs) are growing rapidly. The next generation wireless technology systems are being devised with the vision of heterogeneity where a mobile user will be connected with multiple wireless networks like GPRS/UMTS, IEEE 802.1x, WiMAX and satellite etc. To connect the above...
Heterogeneous Wireless Access Networks (HWAN), referred to as 4G network or Next Generation Wireless Network (NGWN) is, in addition of providing higher radio bandwidth than current 3G networks, to integrate the different wireless access technologies (e.g. GSM, GPRS, EDGE, UMTS, WiMAX, WLAN, etc…) into a common IP-based network in order to offer mobile users continuous and unified service in a transparent...
A critical part of the IEEE 802.16e MAC layer specification is scheduling. The scheduling mechanism has a significant effect on the performance of WiMAX systems for use of bandwidth and radio resources. In this paper, we propose a self-adaptive fuzzy based scheduler, and call this approach SAFS which respectively, adjust priority and transmission Quantum to each connection by taking the packet head-of-line...
This paper defines a conceptual framework necessary for leveraging wireless broadband communications to support the implementation of various advanced multimedia services. This framework provides guidance on deploying wireless multimedia systems, supported by the broadband communications systems, in addressing interoperability needs for successful end-to-end communications of the multimedia service...
Achieving quality of service (QoS) in IEEE 802.16 networks depends, among other factors, on mechanisms for traffic policing at the base station (BS) and subscriber stations (SSs). Since IEEE 802.16 does not include a mandatory policing, this paper proposes a policing mechanism for the SS in the uplink traffic which uses the leaky bucket mechanism (token bucket). The performance evaluation studies...
Regarding the necessity of internet and also increasing demand for various services, WiMAX network with high bandwidth and suitable speed of transfer can be considered as a solution for public access. This technology with production in considerable volumes from fixed to portable versions shows notable progress in wireless connectivity. Capability of Quality of Service (QoS) support provides user satisfaction...
We study in this paper the problem of queueing theoretic of OFDMA-based WiMAX with two classes of connections, connections with High Priority (HP) and connections with Low Priority (LP). The key idea to solve the problem of the mixed priority strategy is the technique of the Shadow server approximation. Specifically, we present a single-cell WiMAX environment in which the base station allocates subchannels...
In this paper, a joint uplink (UL) and downlink (DL) framework for wireless mobile camera networks over an OFDMA-based infrastructure is proposed. On the UL, this system collects unicast real-time video streams from mobile wireless camera stations (CSs) and forwards them to a control center. On the DL, the aggregated video streams are multicast to multiple mobile stations (MSs) to facilitate monitoring...
As wireless access technologies grow rapidly, the recent studies have focused on granting mobile users the ability of roaming across different wireless networks in a seamless manner thus offering seamless mobility. The different characteristics of each wireless technology with regard to Quality of Service (QoS) brought many challenges for provisioning the continuous services (audio/video streaming)...
This paper studies QoE (Quality of Experience) enhancement of audio-video IP transmission over the uplink channel, i.e., from subscriber stations (SSs) to the base station (BS), in the IEEE 802.16 BE service. We assume two types of capacity allocation schemes for uplink and downlink burst durations: static and adaptive. Furthermore, we introduce a piggyback request mechanism for uplink bandwidth requests...
Nowadays, the current trend is to integrate mobile WiMAX with 3G networks to meet the growing demand for high-speed connectivity and ubiquitous coverage. The design and implementation of seamless integration architecture for heterogeneous networks is a challenging task, as it requires comprehensive effort to provide mobile user with seamless experience while switching between access networks. In order...
In IEEE 802.16 e/m mobile broadband wireless systems, mobile subscriber stations (MSSs) are encouraged to enter the sleep mode for energy saving when end users do not have downstream or upstream traffic. To avoid service disruption of an MSS which stays in the sleep mode, IEEE 802.16 e/m specifies a two-way handshake protocol between the base station (BS) and an MSS. After performing the handshake...
This electronic document is a “live” template. In this paper we are interested to IEEE 802.16, the standard for broadband (high-speed) wireless access (BWA) in a metropolitan area. Many carriers all over the world have been deploying Mobile WiMAX infrastructure and equipment. This technology makes it possible to meet escalating business demand for rapid Internet connection and integrated data, voice...
Seamless handover between different access technologies is a great challenge as it needs to obey different performance of QoS and security constraints. Subscribers are becoming more demanding regarding roaming capabilities across different networking technologies such as WiFi, WiMAX, and CDMA as they claim service continuity with QoS requirement and good security features. In this paper, a QoS based...
Worldwide Interoperability for Microwave Access or better known as WiMAX is a technology based on IEEE 802.16 standard with guaranteed QoS which provides high speed data rates. In this paper, we analyze the performance of VoIP over the commercial WiMAX networks through traffic measurements. The measurements focused on two QoS elements, jitter and latency that greatly affect the quality of the network...
Vertical handover (VHO) is an essential requirement to provide seamless connectivity in heterogeneous radio access networks (RAN) environment. Intelligent transportation system (ITS), which needs an “always best connected” communication to ensure vehicular safety, is an application of 4G that is characterized by heterogeneous RAN. A novel context aware vertical handover algorithm for vehicular communication...
Quality of service (QoS) is an important issue in the deployment IEEE 802.16 networks with real-time and non-real-time traffic integration. IEEE 802.16j is an extension of IEEE 802.16 to support relay transmission. In this paper, we propose a dynamic hybrid distributed scheduling mechanism (DHSM) for IEEE 802.16j networks with non-transparent relay stations. First, we define a suitable priority for...
Supporting quality of service (QoS) guarantees for diverse multimedia services are the primary concerns for WiMAX (IEEE 802.16) networks. A scheduling scheme that satisfies QoS requirements has become more important for wireless communications. We propose a downlink scheduling scheme called adaptive priority-based downlink scheduling (APDS) for providing QoS guarantees in IEEE 802.16 networks. APDS...
WiMAX-WLAN gateway (WWG) in heterogeneous WiMAX networks were configured to aggregate and route traffic from WiMAX and WLAN mobile stations (MSs) that is out of coverage with base station (BS) and access point, respectively. However, previous studies on bandwidth request (BR) mechanism at WWG are carried out using either polling or bandwidth reservation for best effort (BE) services. These studies...
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