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Existing telemedicine systems that rely on single telecommunication network are unable to guarantee the user is always connected to healthcare professionals anywhere and anytime. The use of heterogeneous wireless networks can overcome this issue. However, the existing handover schemes are not efficient enough for telemedicine application. This is because the preference of telemedicine user might change...
Next Generation Wireless Networks (NGWNs) are expected to be heterogeneous, which integrate different Radio Access Technologies (RATs) such as 3GPP's Long Term Evolution (LTE) and Wireless Local Area Networks (WLANs) where a transmission is supported if the signal-to-interference-plus-noise ratio (SINR) at the receiver is greater than some threshold. In this paper, we analyze the interference in heterogeneous...
Current heterogeneous wireless networks often overlap because of their complementary characteristics and the large deployment of various wireless access technologies. Mobile devices, which are equipped with multiple wireless interfaces, called multiple radio access technologies (multi-RATs) mobile stations (MSs), are also becoming increasingly popular. Therefore, common radio resource management (CRRM)...
The wireless technologies in a heterogeneous wireless network usually differ in terms of, but not limited to, their offered bandwidths, operating frequencies and costs, coverage areas, and latencies. Currently, no single wireless technology claims to provide cost-effective services, which offers high bandwidths and low latencies to all mobile users in a large coverage area. This is where the need...
Efficient vertical handover mechanisms are required to provide service continuity over available and upcoming heterogeneous wireless access networks. They should provide low delays and good accuracy to meet service requirements. In the literature, proposed mechanisms rely on a rich knowledge of users' ambient environments and contexts. The outcomes are complex mechanisms that require significant amount...
To achieve seamless mobility in integrated wireless and mobile networks, an intelligent vertical handoff mechanism is required to guarantee Always Best Connected. In this paper, a vertical handoff decision algorithm for nonreal time and real time services and network selection for WLAN/WiMAX/UMTS are presented. The conditions of handoff decision procedure consider predictive received signal strength...
To achieve seamless mobility in integrated wireless and mobile networks, an intelligent vertical handoff mechanism is required to guarantee Always Best Connected. In this paper, a vertical handoff decision algorithm for nonreal time and real time services and network selection for WLAN/WiMAX/UMTS are presented. The conditions of handoff decision procedure consider predictive received signal strength...
In this article, we present QoS-Guaranteed local mobility management with bicasting tunnels for mobile devices with dual interfaces. The IETF standard HMIPv6 has been extended where bi-casting tunnels between an access router and the mobile node in 3G/WiFi network are dynamically constructed using dual interfaces. The detailed signaling procedure for the extension of HMIPv6 has been designed and NS2...
This paper considers optimizing the utilization of radio resources in a heterogeneous networks consisting of a WLAN and a CDMA network. We propose a joint admission control mechanism for multimedia traffic that exploits vertical handoff as an effective tool to enhance radio resource management while guaranteeing handoff user's QoS requirements. The network resources utilized by the vertical handoff...
The integration of heterogeneous wireless networks has been studied for some time. Wireless networks can be complementary by providing additional resources to one another if properly integrated. For example, 3G networks offer increased coverage, but they have a low capacity for data transmission. In contrast, WLANs (Wireless Local Networks) offer a limited coverage range while allowing high rates...
Seamless mobility across heterogeneous wireless networks requires a certain level of Quality of Service (QoS) to be assured as it determines the packet loss and delay during handoff procedure. Selecting the target network in an appropriate time plays a crucial role towards achieving ubiquitous networks. This paper proposes a network discovery and selection method called Improved Access Router Discovery...
The instable user behavior and the burst traffic usually induce low utilization of spectrum resource in single wireless network. This paper proposes a novel spectrum borrowing scheme which allows spectrum borrowing between heterogeneous wireless networks to more efficiently make use of limited radio resource. The proposed scheme is based on the model composed of TD-SCDMA (time division-synchronous...
A novel adaptive scheduling with coordination for the performance improvement of delay-sensitive applications over heterogeneous wireless networks is proposed. It can bring such contributes i) adaptation capabilities at different layers of the protocol stack, and ii) the coordinated scheduling initiation procedure. It uses information from the physical layer and data link layer to determine the appropriate...
Future wireless network must be able to coordinate services within a diverse network environment. One of the challenging problems for coordination is the selection of optimal network depending upon the type of demanding application. There are different types of Internet applications and network interfaces. The quality of service requirement varies from one application to another. The present work...
Live SNG (Satellite News Gathering) services, featuring real-time streaming of high-quality video, are typically enabled via expensive SNG vehicles and satellite transmissions by TV companies. In this paper, we design a cost-effective solution to delivering live news broadcasting (LNB) service over emerging broadband wireless access technologies such as WiMAX. However, LNB is a bandwidth hungry service...
This paper proposes a preference value-based cell selection (PVCS) scheme to satisfy quality of service (QoS) requirements, maximize accommodated number of calls, and minimize handoff occurrence frequency in heterogeneous wireless networks. The PVCS scheme contains three stages including candidate cells selection, preference value calculation, and target cell determination. The candidate cells selection...
To satisfy and maximize the profit of both users and networks in all kinds of heterogeneous wireless networks, end users require appropriate selection of an optimal radio access network. At the same time consistent wireless networks have to select users to maximize its profit and the game theory is developed to address the questions how rational decision makers can interact to achieve their objectives...
In the wireless heterogeneous environment, to access the Internet ubiquitously, most of the devices are equipped with multiple radio interfaces. Through this way, the multi-homed node can attach to multiple access networks through one or more radio interfaces. However, this brings forth also a problem of how to select a proper interface and access network for an ongoing application on a user's device...
In a heterogeneous wireless network, where many different wireless networks interwork together, call admission control is an important issue to distribute user traffic among different access networks in order to provide quality of service (QoS). In this paper, we present and analyze the performance of a call admission control (CAC) policy for voice and data calls, which is based on one-hop cooperation...
In this paper, we investigate the issue of vertical handoffs in heterogeneous wireless networks. A QoS-based vertical handoff scheme for WLAN and WiMAX interworking networks is proposed with aim to provide always best service to users. We also present a simple, yet efficient method to estimate the available bandwidth in WLAN and WiMAX networks to evaluate the real-time status of the overlay networks...
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