A hybrid (N/M)CHO soft/hard vertical handover technique for heterogeneous wireless networks (original) (raw)

Vertical Handover between WiFi and UMTS Networks: Experimental Performance Analysis

2011

In this paper, we analyze the performance of vertical handover (VHO) algorithms for seamless mobility between WiFi and UMTS networks. We focus on a no-coupling scenario, characterized by the lack of any form of cooperation between the involved players (users and network operators). In this "hostile" scenario, the VHO operations are completely operated by the mobile terminal (MT), and the network authentication procedures are unoptimized, leading to typically long handover times. In this context, we first propose a low-complexity Received Signal Strength Indicator (RSSI)-based algorithm and, then, an improved hybrid RSSI/goodput version.

A Review on Vertical Handover Techniques applied in Heterogeneous Cellular Networks

2021 1st International Conference on Multidisciplinary Engineering and Applied Science (ICMEAS), 2021

Global mobile data traffic reached 11.5 exabyte per month at the end of 2017, up from 6.7 exabyte per month at the end of 2016. Therefore to keep-up with this ever-increasing data demand, Heterogeneous network seams to be the most appropriate resolution. A Heterogeneous network consists of a combination of different types of nodes (small-cells and macrocells) that share coverage regions and may use different radio access technologies. Whenever a user in active connection moves from one cell to the other, the network must transfer the connection to a new cell to maintain the communication service in a process called handover. However this handover process must be seamless. Some key handover challenges and design issues for the next generation of wireless networks was discussed in this review.

Design an Algorithm for Vertical Handover Strategies in Heterogenous Wireless Network

2018

A heterogenous wireless network consists of different wireless access standards. To transfer data seamlessly vertical handoff (VHO) plays a major role. Seamless continuity is the main goal in 4G wireless networks. When a mobile terminal is in overlapping area, for service continuity handoff mechanism is mainly used while moving in heterogenous wireless networks. Vertical Handoff decision (VHO) is based on received signal strength (RSS) signals. While taking VHO decision, user mobility is an important factor. VHO is required only at lower speeds and higher speed user velocity may cause unnecessary handovers that can reduce system capacity and Qos level. UE velocity makes the HO decision, we can reduce the transmission cost and transmission time. Wireless access standards: Wi-Fi, Wimax, LTE. This algorithm is simulated in NS2 and its performance is evaluated in terms of user velocity and handover numbers. This approach leads to improvements in the end user experience. IndexTerms–Heter...

Vertical Handover in Wireless Heterogeneous Networks

—Handover is one of the enhancement mechanisms that plays a central role in heterogeneous wireless networks. Designing a handover algorithm for heterogeneous networks becomes an essential issue since it is responsible for providing better Quality of Service (QoS) and higher level of Quality of Experience (QoE) to users. Similarly, the proposed algorithms must fulfill the user's QoS requirements and must also provide seamless roaming across different networks. This paper presents an overview of some key issues pertaining to the design of Vertical Handover (VH) in 4G and 5G wireless networks. The VH measurements and decision mechanisms are studied in relation to network types and frequency used mechanisms. Moreover, the advantages and drawbacks of the existing works are investigated in detail and the challenging issues of the next generation of wireless networks are presented as well.

Comparative Analysis of Vertical Handover in Integrated Networks

Ijca Proceedings on International Conference on Recent Advances and Future Trends in Information Technology, 2012

Broadly accepted WLAN technology and the UMTS system are two most important wireless networks in the future. A lot of interests have been put in integrating these networks in order to get the benefit of both high data rate of WLAN and wide coverage area of cellular networks, and supporting end to end Quality of Service (QoS) is an unavoidable topic towards such a goal. Looking at the collective advantage of both heterogeneous networks is the inspiring feature of UMTS/WLAN integration. This paper proposes different solutions for UMTS/WLAN integration and vertical handover problems. The solution is based on an implementation of two coupling schemes that are later enhanced to support handover solutions. The work involves network simulation and comparative analysis for the proposed solutions, as well.

Efficient vertical handover approaches for increased user satisfaction in next generation networks

International Conference on Computer Networks and Information Technology, 2011

The next generation of wireless networks will integrate the current co-existing wireless networks to allow the users to connect to the network that best suits their needs. The users will be enabled to roam among diff erent networks by a process known as vertical handover. Vertical handover can be imperative or alternative depending upon the reason of handover initiation. In this paper, we have proposed algorithms to perform imperative and alternative handovers.

A Survey on Vertical Handover Decision Making in Next Generation Heterogeneous Wireless Networks

2014

The next generation mobile devices will be enabled with the ability to support multiple types of networks i.e. the terminal supports multiple network interface. The key enablingfunction for achieving seamless mobility and seamless service continuity for such devices is seamlesshandoffs across heterogeneous wireless access networks. A challenging issue in themulti-service next generation wireless network (NGWN) is to select the appropriate Handover decision strategy for the handover initiation stage.An overview and categorization of various verticalhandoff decision schemes are shown that helps in selection of best scheme among them all accordingly to the requirements of different users.

Vertical handover in heterogeneous network

The need of always being connected to network with multiple wireless technologies calls for seamless connectivity in high dynamic scenarios. An intelligent handover decision policy able to classify the candidate’s point of attachment based on their provided context and the required mobile user context is required to ensure seamlessness. The decision policy is realized with an algorithm which will choose the appropriate context to be used for making decision for mobility management and handover process. In this paper, three radio access technologies, Wi-Fi, 3G and GPRS (mobile networks), are considered for implementation. An optimistic approach for an intelligent handover in order to achieve the best available network is discussed.

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.

Increased Quality of Service through Vertical Handover in Herterogeneous Network of Umts and Wlan

2015

This paper is a part of an ongoing research on handover performance when a user seamlessly moves between different accesses technologies is called Vertical heterogeneous handover.It discussed some of the advances that have been made to reduce vertical handover (VHO) latency for successful handover especially in heterogeneous network environments. Video streaming and voice conversation across different network environment could pose serious challenges to the quality of service during handover. This is the reason why it is imperative that mechanism for maintaining quality of service during handover is considered seriously. This investigation is aimed at adopting a VHO Mobile IP schemeto Furtherreduce handover latency in heterogeneous wireless networks composed of WLAN and GPRS or 3G networks for increased QoS for video and voice streaming. An enhanced hybrid scheme of Bi-mSCTP method with Mobile IP implementation, internetworking handover issue can be resolved and the handover Latency...