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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...
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...
Wimax is an broadband wireless technology based on IEEE 802.16. It is very helpful and cheaper than other possible solutions. It is purely based on the 4G technology for the upcoming generation. In wireless technology the major problem is speed, Quality of Service, data rates in order to overcome that they going for some valuable technology. In this paper we consider WIMAX and WLAN for controlling...
In mobile communications, seamless mobility is needed among heterogeneous wireless networks. Service continuity can be maintain by using an accurate vertical handover scheme. IEEE802.21 standard facilitates handover between heterogeneous networks by presenting media independent handover (MIH) reference models for different link layers technologies. In this paper, we carried out a comprehensive analysis...
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...
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...
The topological characteristics of an IEEE 802.16 mesh network including the tree’s depth and degree of its nodes affect the delay and throughput of the network. To reach the desired trade-off between delay and throughput, all potential trees should be explored to obtain a tree with the proper topology. Since the number of extractable tree topologies from a given network graph is enormous, we use...
In WiMAX architecture to avoid congestion at the base station, a mechanism namely WiMAX Fair Intelligent Congestion Control (WFICC) was proposed in [11]. WFICC ensures that the traffic is scheduled in such a way that the base station output buffer operates around a target operating point, without violating the Quality of Service (QoS) requirements of connections. However, only preliminary results...
The IEEE 802.16j Mobile Multi-hop Relay (MMR) WiMAX networks allow the extension of the coverage area of a WiMAX network by deploying a relay station (RS). In WiMAX, subscriber station (SS) located non Line-of-sight (LOS) with the BS suffers from deterioration in service. In this paper, we investigate the usage of RS in improving the per-user throughput. Simulations are performed using OPNET Modeler...
In this paper, we have observed that the performance analysis of one of the most challenging security issue for wireless network i.e. Black hole attack. WiMAX-WLAN interface will play a important role in the NGN (Next generation Network) scenario. This attack is possible in WiMAX-WLAN interface network i.e. in current scenarios. In this paper we analyzed the performance analysis of Performance Analysis...
IEEE 802.16e based WIMAX is a promising technology for broadband wireless access (BWA) because of its high scalability, large coverage area, high data rates and low cost of system deployment. Unlike wireless Local Area Networks (LANs), WIMAX network supports Quality of Service (QoS) to different types of network traffic and has introduced several mechanisms at Medium Access Control (MAC) layer to...
In our earlier work, we described an optimization problem and corresponding scheduling algorithm aimed at obtaining maximum throughput guarantees in wireless networks. To further improve the short-term performance, we also proposed two adaptive versions of the optimal algorithm. Results from the simulations showed that the adaptive algorithms perform significantly better than other well-known scheduling...
In this paper, we study the performance of some of the key scheduling algorithms such as Proportional Fair Scheduler, Modified Longest Weighted Delay First and Exponential Rule. We also propose a new algorithm called EXPQW, a variant of the Exponential rule which assigns weights to the subscriber stations based on their queue length and waiting time thereby ensuring fairness and quality of service...
A multi-access radio network that efficiently utilizes radio resources is a promising approach to flexible, reliable, high-capacity communication. Regarding cooperative controlling functionality in a heterogeneous radio network, two schemes are considered to be applicable to the efficient usage of multi-radio systems: link selection and link aggregation. This paper focuses on link selection and its...
The present work proposes a communication system to ensure Internet connectivity and network transparency to a group of nodes within a vehicle in the heterogeneous wireless networks environment. It organizes routers and hosts located inside a vehicle into a mobile network. Each vehicle is equipped with multiple cares of addresses corresponding to multiple network interfaces. The proposed scheme provides...
This paper describes both link budget analysis and field experimental results on a mobile WiMAX system deployed in Azumino city, the city scale of which is corresponding to suburban. Firstly, in this paper, the link budget analysis is performed in order to evaluate the system performance based on propagation distance, delay spread, average BER (Bit Error Rate) under a multipath fading environment,...
To better exploit the spectrum resources a wireless sensor network can be used to assists a secondary cognitive radio network by providing information about the current primary spectrum occupancy. In this paper we study the performance of the secondary network when it is co-located with and having similar cell size as a mobile primary network that uses a cellular reuse pattern with seven frequencies...
Worldwide Interoperability for Microwave Access (WiMAX) is defined by the IEEE 802.16. It is an IP based, wireless broadband access technology. This technology can be implemented in 4th generation wireless technologies, for Metropolitan Area Network (MAN). The IEEE 802.16 standard includes specification for the Medium Access Control (MAC) and Physical (PHY) layers and is designed to provide broadband...
To meet the continuously increasing demands and requirements of mobile users, next generation wireless systems are more and more relaying on the coexistence of heterogeneous wireless networks. The objective is to provide any time and anywhere connectivity to users. One of the main challenges in such a heterogeneous environment is mobility management, including network selection and Vertical Handover...
The increasing demands for multimedia applications with various QoS requirements arouse the interest of researchers in the Fourth-generation wireless networks such as WiMAX. In order to ensure that the QoS requirements of these applications are met, effective scheduling algorithms must be designed. Even though it may be trivial to ensure that the minimum QoS of all service classes is attained, this...
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