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Through the wide deployment of high-speed rails around the world, multimedia services on high-speed trains will be highly demanded in the near future. However, network round trip time and packet loss rate for high-speed rail reception are much higher and also of high variance. To facilitate the delivery of a live video streaming service, our previous research suggests that the video streaming service...
WiMAX is a radio technology for transmitting data at high speed. The challenge for these networks is to ensure the Quality of Service (QoS) for different types of applications having different characteristics and requirements. Among these applications we note the telemedicine; where communication and information technology is used to help improving human life especially in regard to health. Medical...
WiMAX technology provides a Quality of Service (QoS) system that allows system operators to configure a network to provide maximum performance compared to conventional Best Effort (BE) systems. In this paper, we address the increase in number of data rich mobile devices and the performance issues associated with Video On Demand (VOD) multimedia traffic over a WiMAX network. We present the results...
WiMAX delivers Quality of Service (QoS) to users based on a pre-determined traffic classification model. We develop an auction framework to bid for allocating the resources based on the utilities and traffic demands. We classify the users into two categories Premium User who has a high priority access and Non premium user having low-priority access. In principle larger the bandwidth more resources...
This paper proposes a scheduling approach for mobile uplink WiMAX system that provides a trade-off between delay requirement satisfaction and throughput maximization. The paper starts by introducing three scheduling algorithms each with a different objective. The first aim is to maximize the throughput of the system, while maintaining the user fairness. The second aim is to satisfy the delay requirements...
As an attempt to improve throughput of WiMAX system, the oversampled WiMAX receiver is presented in this paper. Oversampling samples each transmitted symbol more than one time. Thus, several signal sequences which contain different information about channel may be obtained at the receiver. This study presents throughput of the oversampled WiMAX system that obtained by simulation over a realistic channel...
The mobile networks are continually evolving in order to support more users, to achieve higher data rates, and to provide new (multimedia) services. The next generation networks must be able to service heterogeneous traffic with diverse quality of service (QoS) requirements. Orthogonal frequency division multiple access (OFDMA) is important techniques for high data rate wireless multiuser communication...
Relay is one of major features considered for IMT-Advanced systems. The main function of relay station is to enhance the network capacity and extend the coverage area. The paper focuses on multi-hop routing mechanism used in relay WiMAX networks. The performance of routing path selection is based on the throughput and packet loss ratio for the downlink transmission. This paper proposes channel-aware...
By employing a relay station (RS) on the WiMAX networks, it offers an extended coverage and improved capacity over wireless broadband. However the mobile station (MS) such that connected to the RS has effect the system performance due to increase of the MS numbers. In WiMAX the base station (BS) adopts the centralized-based polling mode where the best way to guarantee the delay bound is by polling...
We address an issue of scheduling for uplink realtime flows in WiMAX networks. Real-time flows require hard delay and throughput guarantees. Thus, each packet has a strict deadline and the packets delayed beyond their respective deadlines are dropped. Real-time applications can sustain some loss gracefully. Alternatively, they require some minimum throughput guarantee. Most of the existing scheduling...
Hybrid wireless networks have been identified as a promising solution to establish communication over vehicular systems that can overcome the current and future needs for increasing public safety and efficiency. In this paper a heterogeneous hybrid vehicular wireless network consisted of IEEE 802.11b/g/e and IEEE 802.16e is being deployed inside a tunnel environment for surveillance reasons. Furthermore,...
The revolution of telecommunication mobile technology and the growing market of services and applications in the Internet have put more pressure on MNOs (Mobile Network Operators) in order to offer wireless and mobile broadband services. In SA (Saudi Arabia) there are 3 MNOs who have started in 2011 offering 4G services. In this paper we will give some description to 4G networks and make brief comparison...
WiMAX (Worldwide Interoperability for Microwave Access) is a wireless communication standard. Today largely used as a mode of transmission and access to broadband Internet. WiMAX is based upon IEEE Standard 802.16, it supports Point-to-MultiPoint (PMP) as well as Mesh mode. In this work, our main objective is to compare through simulations, the QoS performance parameters (Average throughput, average...
Next generation wireless networks are expected to be Heterogeneous consisting of several wireless technologies such as 3G, WLAN, WiMAX, LTE etc. Users of future mobile networks will be able to choose from different radio access technologies. These networks vary widely in service capabilities such as coverage area, bandwidth and error characteristics. Network selection is a challenging task in heterogeneous...
WiMAX is based on the standard IEEE 802.16e-2009 for wireless access in Metropolitan Area Networks. It is one of the solutions for 4G IP based wireless technology. WiMAX utilizes Orthogonal Frequency Division Multiple Access which also supports Multicast and Broadcast Service with appropriate Modulation and Coding Scheme. Presently, Scheduling and Resource allocation algorithm in Opportunistic Layered...
The contention based bandwidth request mechanisms are gaining much interest due to dynamic assignment of bandwidth to mobile stations (MS). The contribution made in this paper is twofold. First contention based bandwidth request is investigated for worldwide interoperability for microwave access (WiMAX) and long-term evolution networks (LTE) networks under various mobility conditions. It is found...
Quality of Service (QoS) differentiation measurement provides the ability to evaluate different level of QoS support in 4G networks such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX). Many research studies around the world have addressed the QoS Differentiation (QoS-Diff) considerations, however, to the best of our knowledge, only a few have attempted to...
In the last few years, there has been an increasing awareness of the need to evaluate new mobile applications and protocols in realistic wireless settings, and platforms such as the GENI WiMAX testbeds have been developed to fulfill this need. However, wireless testbed users have experienced frustration when straightforward usage scenarios do not consistently agree with the high data rates that are...
The DockingAssist system is a centralised, cost-effective, real-time navigation system that provides the necessary centimetre positioning and speed accuracy to ensure efficient and safe manoeuvring within a entire port area, thereby enhancing vessel trajectory and providing constant monitoring of moored/docked vessels. By reducing transit, this system will result in improved port traffic management...
In next generation wireless networks like WiMAX, a dynamic Call Admission Control (CAC) plays an important role to ensure Quality of Service (QoS) of existing users and to efficiently utilize network resources. We propose a predictive CAC namely Wireless Fair Intelligent Admission Control (WFIAC) that admits or rejects a new incoming connection base on resource availability and load in the network...
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