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Wireless network is based on packet switching concept and is capable of handling various types of applications. The challenge is to attain a better Quality of Service (QoS) for the like applications of real time and non-real time in an intriguing environment with varying bit rate, unexpected channel lay off. The intention of QoS provision is to afford the opted services for the users while utilizing...
Worldwide Interoperability for Microwave Access applications and QoS specifications are based upon class based schemes. These service classes effect to QoS for user fairness and system utilization. Improved MAX C/I algorithm considers user waiting time and channel to interference ratio but not class based scheduling schemes, after including this neglecting condition algorithm solves the problem of...
WIMAX stands for Wireless Interoperability for Microwave Access. It is a telecommunication technology that provides Internet connectivity, data and voice services over long distances in several ways. These services can only be effective if it is available during the movement of node so mobility is important in wireless network. So, this paper analysis the performance of mobile nodes during handover...
This article provides an assessment of performance using the femtocell as access technology for return channel Digital TV, analyzing their use in conjunction with WiMAX and DSL standards. From this idea several simulations using the FTP and DTV services as well as video and voice transmissions were made, beyond the inclusion of competing traffic so that the environment is closely match a real scenario,...
High Altitude Platform Station (HAPS) is one of a new infrastructure in telecommunication, which is like airship or aircraft that is placed on the stratosphere. The distance of platform is about 17–22 km from the earth's surface. However, in its application HAPS that placed on the stratosphere layer of air is affected by the wind gusting. Position HAPS can change from the normal state that is called...
This article describes the performance evaluation of a new wireless TCP algorithm in real environments, in order to identify the advantages and disadvantages of its operation. We evaluate the proposed wireless TCP algorithm with respect to generic TCP, considering an intrusive technique by using traffic injection. These tests were performed over point-to-point WiFi and WiMAX links in out-door and...
Heterogeneous Network consists of wired and wireless network. In these networks, congestion control and quality of service is major issue. Due to this issues, delay and jitter are increased which decreases the performance of network. For reducing this issues there are various queue management techniques which are classified as Active Queue Management and Passive Queue Management. AQM consists of access...
WiMAX (World Wide Interoperability for Microwave Access) is a standard based technology based on IEEE 802.16 Air Interface. This standard is the future mode of mobile communication. Therefore, it is important to evaluate the performance of WiMAX in different scenarios. In this paper we have presented performance analysis of WiMAX for the CBR (Constant Bit Rate) traffic with and without mobility. Two...
Competitive environment has led popularity of VoIP over WiMAX due to its large transmission bandwidth coverage, and Quality of Service (QoS) support. For voice calls applications such as MSN Messenger, Google Talk, and Skype, VoIP is an emerging technology for WiMAX networks. In this kind of network, performance analysis of node mobility depends on network connectivity. This paper has considered horizontal...
Handoff management is a critical issue for seamless connectivity in heterogeneous networks. Call termination due to migration from one network to other network is not appreciated in today's high- speed communication intensive world. This paper deals with the problem of vertical handoff in heterogeneous networks for streaming data. In this paper, a novel method is proposed for vertical handoff by using...
Worldwide Interoperability for Microwave Access or better known as WiMAX is an air-interface standard in accordance with the IEEE 802.16. Mobile WiMAX or IEEE 802.16e standard defines five different service classes which can be used to satisfy the VoIP QoS. In this study, different trajectory is applied to the MS with the encoder of G.711 and G.729 in order to identify which encoder gives the best...
WiMAX refers to Wireless Interoperable implementations of the IEEE 802.16 standards ratified by the WiMAX Forum has a main goal to deliver wireless communications with quality of service in a secured environment. The WiMAX MAC layer is designed to support different types of applications and services having different Quality of service (QoS) requirements. In addition of providing higher throughput...
Maritime wireless ad-hoc network is the future of maritime communication. When navigators sail to the sea, they usually go together as a convoy to avoid the problem of natural causes and human factors such as occasionally severe weather conditions and piracy. In essence, the navigators need to communicate with each other in their convoy. To evaluate the system functionality, network simulators are...
In this paper, we propose a new scheduling algorithm for IEEE802.16 Broadband wireless Metropolitan Area Networks in TDD mode. Based on some known algorithms such as Modified Deficit Round Robin (MDRR), Proportional Fairness (PF) and Adaptive Proportional Fairness (APF), we have studied the scheduling problem and proposed scheduling algorithm, called (Enhanced-APF) for focuses on an efficient mechanism...
It is becoming increasingly relevant to analyze and understand effect of Packet Queue Scheduling algorithms in mix traffic scenario that exist in wireless networks nowadays. This paper presents simulation and evaluation of Random Early Detection with In and Out (RIO), Deficit Round Robin (DRR) and Worst case Fair Weighted Fair Queuing (WF2Q+) scheduling schemes and their comparative analysis under...
The contention based bandwidth request (BR) mechanism in heterogeneous networks has significant impact on the power consumption of mobile stations. The existing power saving algorithms conserves energy with reduced contention performance. However, both contention mechanism and power saving algorithm are to be effective so that the system will exhibit improved contention performance with reduced power...
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 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...
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...
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