Implementation of Vertical Handoff in Heterogeneous Networks (original) (raw)
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An Implementation of Vertical Handoff in Heterogeneous Networks
2009 5th International Conference on Wireless Communications, Networking and Mobile Computing, 2009
With the development of wireless communication technologies and mobile Internet, the demand for the ubiquitous service is increasing dramatically. However, there are many critical issues which prevent the performance in accessing the ubiquitous heterogeneous wireless networks. So the subject has become the focus of many research institutions. We establish a practical testbed which includes the different wireless access network technologies: WLAN, GPRS and TD-SCDMA. In our experiment, the Mobile Node (MN) is a multi-interface device supporting Mobile IPv6 (MIPv6). We implement the MN vertical handoff and evaluate the performance of MN vertical handoff in terms of the handoff delay.
Journal of Communications Software and Systems, 2017
Users of next generation wireless devices will be likely to move across a heterogeneous network environment. Thiswill give them the possibility to always exploit the best connection to the global Internet. In order to keep a seamless connection, the handover between different access technologies, also known as vertical handover, must be as smooth as possible. The current evolution of network architectures toward an all-IP core favours the use of the Mobile IPv6 protocol to handle such handovers. However, this protocol still presents several drawbacks, mainly related to the assumption of static devices and wired connections. Hence we have designed and implemented a software module that exploits information from the lower layers (e.g. physical) to extend the capabilities of Mobile IPv6 to wireless environments. We have then evaluated both the plain Mobile IPv6 and our proposed implementation over an experimental testbed. The outcome of the assessment proves the effectiveness of our so...
Experiences with SeaMo: A Vertical Handoff Implementation for Heterogeneous Wireless Networks
Proceedings of the Asia-Pacific Advanced Network, 2011
SeaMo, a vertical handoff (VHO) implementation based on our earlier paper [1] is tested with various mobility scenarios on a mobile IP testbed using MIPv6 and HIP protocols for mobility management. SeaMo considers various parameters like RSSI, link quality metric, end-to-end available bandwidth, battery power, network usage costs etc., in making the VHO decision. We present our experiences using SeaMo in mobility scenarios involving 3G and WLAN. We present a set of results which demonstrate the performance of SeaMo. We explain the need for considering a wide range of parameters from RSSI to network usage cost. We also highlight the impact of using the available battery power in decision making. In addition, we attempt to measure typical values of parameters such as network association delay, and handoff decision delay that impact the QoS.
Enhanced fast handoff scheme for heterogeneous wireless networks
Computer Communications, 2008
Mobility management, integration and interworking of existing wireless systems are important factors to obtain seamless roaming and services continuity in next generation or 4G wireless networks (NGWN/4G). Although, several IPv6-based mobility protocols as well as interworking architectures have been proposed in the literature, they cannot guarantee seamless roaming, especially for real-time applications. Moreover, mobility management protocols are designed for specific needs, for example, the purpose of IPv6-based mobility schemes consists of managing users roaming while ignoring access network discovery. This paper proposes an efficient handoff protocol, called enhanced Handoff Protocol for Integrated Networks (eHPIN), which carries out localized mobility management, fast handoff, and access network discovery. It alleviates services disruption during roaming in heterogeneous IP-based wireless environments. Performance evaluation results show that eHPIN provides significant gain with respect to signaling traffic overhead cost, handoff latency, packet delivery cost, handoff failure and packet loss compared with existing IPv6-based mobility schemes.
Fast and Reliable Handover InHeterogeneous Networks (Mobile IPv6)
2014
The continuation of an active call or service is one of the vital metrics for assessing the performance of a wireless communication system. The handover process is inevitable when the Mobile node is roaming across the networks. When a mobile node is moving from home access point to another access point, handover with low latency and minimum packet loss is required in order to get better Quality of Service (QoS) for IP applications such as Voice over IP (VoIP), video conferencing, live streaming in mobiles etc. In this paper, Modified Reactive Fast Handover for Mobile IPv6 is used to reduce handover latency and packet loss, which involves packet buffering at the Correspondent Node (CN). Network Simulator version 2 (NS-2) is used under ubuntu operating system as simulation tool for the proposed scheme.
Wireless Communications and Mobile Computing, 2008
With the rapid growth of mobile Internet, offering seamless connectivity in different types of wireless networks is an important feature in next generation wireless networks (4G networks). Mobile IP (MIP) is expected to play a key role to handle the movements of mobile nodes (MNs) in 4G networks. However, MIP suffers from long handoff latency since it is designed to support the macromobility of a MN. Therefore, it is necessary to devise a scheme that provides currently deployed networks with backward compatibility and that offers seamless connectivity during MIP handoffs across the heterogeneous wireless networks. In this paper, we propose a client-based vertical handoff system for multi-networks to provide end-users with seamless connectivity across heterogeneous wireless networks. Our proposed system is designed as a common network interface at a client side and provides transparent service to IP/MIP layers regardless of used wireless technologies. With this system, we also present vertical handoff performance over a loosely coupled cdma2000/WLAN experimental test-bed. The experimental results show that our system enables a MN to handoff seamlessly across different types of wireless networks without any modifications to the existing IP/MIP stack and core network.
Vertical Handoff in Heterogeneous Wireless Networks
Proceedings of TCS Architects’ Conference (TACTiCS’10), February 2010, Kolkata, India, 2010
With the increasing number of competing technologies, handoff between heterogeneous networks is an important issue in next generation wireless networks like Worldwide Interoperability of Microwave Access (WiMAX), Long Term Evolution(LTE), Wireless-Fidelity (Wi-Fi) or Wireless Local Area Network (WLAN). In fact, there are several heterogeneous wireless access networks deployed around the world and current mobile devices will have multiple network interfaces. These state-of-the-art mobile terminals will allow users to move freely and to switch connections among different access networks, like from WiMAX to Wi-Fi, LTE to WiMAX etc. This process, called vertical handoff, which is a part of mobility management imposes several technical challenges for the integration and inter-working of emerging heterogeneous wireless access networks. The whole problem area involves designing systems that can meet the requirements of managing the system capacity for various applications and mobility scenarios for a growing user population and varying user demands in terms of Quality of Service (QoS). The motivation for addressing the given problem area is to develop wireless packet-switched communications by facilitating a holistic approach for vertical handoff and mobility management in heterogeneous wireless networks. In this paper, we have presented the concept of vertical handoff and demonstrated an inter-technology handoff scheme between WiMAX and WLAN. Our proposed scheme has been implemented on the Qualnet network simulator platform and its performance has been evaluated.
International Journal of Advanced Computer Science and Applications, 2014
One challenge of wireless networks integration is the ubiquitous wireless access abilities which provide the seamless handover for any moving communication device between different types of technologies (3GPP and non-3GPP) such as Global System for Mobile Communication (GSM), Wireless Fidelity (Wi-Fi), Worldwide Interoperability for Microwave Access (WiMAX), Universal Mobile Telecommunications System (UMTS) and Long Term Evolution (LTE). This challenge is important as Mobile Users (MUs) are becoming increasingly demanding for services regardless of technological complexities associated with it. To fulfill these requirements for seamless Vertical Handover (VHO) two main interworking architectures have been proposed by European Telecommunication Standards Institute (ETSI) for integration between different types of technologies; namely, loose and tight coupling. On the other hand, Media Independent Handover IEEE 802.21 (MIH) is a framework which has been proposed by IEEE Group to provide seamless VHO between the aforementioned technologies by utilizing these interworking architectures to facilitate and complement their works. The paper presents the design and the simulation of a Mobile IPv4 (MIPv4) based procedure for loose coupling architecture with MIH to optimize performance in heterogeneous wireless networks. The simulation results show that the proposed procedure provides seamless VHO with minimal latency and zero packet loss ratio.