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Traditional Handover algorithms, such as Hard Handover Algorithm, depend only on the power level. More considerations are necessary to satisfy the end user's requirements. There are more than hundred parameters that could affect handover decision in heterogeneous networks like bandwidth, data rate, QoS, … etc. The goal of this paper is to introduce an adaptive hysteresis fuzzy logic based vertical...
Next-generation IP-based wireless network environments (NGN) will allow users to freely switch between different network technologies while preserving connectivity. Therefore, integrating heterogeneous networks is fundamental to the development of NGN models. In this article we present an analysis of the integration of WiMAX and cellular networks, specifically UMTS. We opted to use a multi-layer integration...
With the growing demand for access to internet anytime from anywhere mobile communication has taken a great place. But for this requirement there needs to be seamless communication amongst various network technologies. Hence vertical handover is of great importance in the forthcoming scenario of mobile communication. This paper proposes an optimized algorithm to have seamless communication using vertical...
Heterogeneous networks provide more flexibility in term of service continuation and capacity to mobile users by having multi-layer networks of different wireless system and interfaces. However, in such network seamless vertical handoff across different networks becomes a challenging and crucial process. Conventional vertical handover decision algorithm uses RSSI as a main parameter to decide handover...
Currently, there are several wireless networks deployed around the world. Examples include cellular networks, metropolitan area networks and wireless local area networks. Given the heterogeneity of the existing network technologies, the diversity of mobile applications, and user requirements, ensuring service continuity for a mobile user when changing different access network becomes a mandatory aspect...
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...
Current market trends have enabled mobile users to rely increasingly on wireless devices to receive and stream video applications in their daily lives. These multihomed devices are capable of changing point of connection while roaming in current heterogeneous wireless networks, due to their multi-access radio interfaces. However, services handover between two wireless cells of same radio access technology...
Recently, the number of mobile users equipped with wireless devices capable of video streaming on the go has increased immensely. The trend follows the ever expanding choice of multi-access wireless technologies to which they connect and the growing popularity of mobile video applications. In this paper, we evaluate mobile video streaming over heterogeneous wireless networks. We design and implement...
A number of algorithms have been proposed for making vertical handover decisions in heterogeneous wireless networks (HWNs). These algorithms are designed for selecting the most suitable radio access technology (RAT) for just a single handoff call from a multimode terminal, during vertical handovers. Multimode terminals for next generation wireless networks have the capability to simultaneously support...
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...
This paper describes a method to emulate a MIH network i.e. to evaluate the real-life behaviour of a MIH network without the need for still not commercially available MIH equipments. The paper focuses on network-wide performance evaluation in the context of a WiFi-WiMAX vertical handover. The EXata Network Emulation tool is used to emulate the MIH network.
Due to the flexibility and simplification, the fuzzy logic control (FLC) is chosen to make effective utilization of resources. The proposed Algorithm is divided into four parts: traffic classification, resource estimation for reservation, admission control and RAT selection. This combined fuzzy logic and multi-attribute decision making (MADM) based algorithm can make proper initial RAT selection,...
In this paper, we proposed a new MIH handover procedure for resource efficiency and handover delay performance in the wireless link of MIH that offers seamless handover between heterogeneous networks. New transaction messages are proposed to indicate a handover event by the MN. We focus the application of our procedure to a handover scenario from mobile WiMAX to wireless LAN, and consider the qualitative...
In order to provide seamless mobility the IEEE 802.21 Media Independent Handover (MIH) working group is in the process of developing a set of mechanisms to facilitate migration of mobile users between access networks that use different link-layer technologies. Users of different available wireless access networks like WLAN, UMTS, VANETs, Wi-MAX, etc., demand real-time support, high availability and...
A wireless heterogeneous network consists of various wireless networks such as Worldwide Interoperability for Microwave Access (WiMAX), Wireless Fidelity (WiFi), cellular networks etc. Vertical handover (VHO) is a procedure that enables continuous seamless communication in these heterogeneous systems. This paper considers the speed as an aspect of motion as input parameters for the handover decision...
Multiple heterogeneous access technologies will be intergraded in the next generation wireless system in which the seamless migration of ongoing data-flows from one access point to another is one of the fundamental issues. In this paper, an IEEE 802.21 Media Independent Handover (MIH) based handover management architecture containing four modules is proposed and the multihoming technology is adopted...
Seamless vertical handover is a key requirement in heterogeneous wireless networks where different networks are integrated. In this paper, we introduce an enhanced information server (EIS) in the IEEE 802.21 media independent handover (MIH) architecture. We also propose an improved vertical handover procedure in which the wireless channel condition is estimated by exploiting spatial and temporal locality...
Currently, the vertical handover between different technologies presents a real challenge to overcome; the service interruptions during handover pose a real problem to users. In this paper we focus on this problem, and we propose the MSCTP protocol characterized by its multi-homing technique, as vertical handover mechanism between the IEEE 802.16e and the IEEE 802.11e networks, in order to reduce...
The move towards an increasingly heterogeneous infrastructure has been one of the directions followed by most mobile operators in recent years. Here, one of the problems still waiting for a solution is how to enable multi-mode mobile terminals to freely roam between the different wireless systems used by the network operator for providing access to its users. The IEEE 802.21 is just one of the standardization...
Recently, network selection for heterogeneous wireless networks has been widely studied by categorizing and employing various factors to decide the best network. Mobility-related factors can be used to represent mobility features of mobile terminals (MTs) and mobility support capabilities of wireless networks, but they are complicated in usage and are not well used in related works. In this paper,...
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