802.21

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  • Topic: IEEE 802.11, IEEE 802, WiMAX
  • Pages : 8 (2871 words )
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  • Published : May 11, 2013
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IEEE 802.21: Media Independent Handover Services

Darshan Rambhia
UID 111932313
Date of Submission: 03/25/2013

IEEE 802.21: Media Independent Handover Services

Darshan Rambhia
UID 111932313
Date of Submission: 03/25/2013

* ABSTRACT
With the advent of smartphones and tablets, it has become a common day practice to have multiple network interfaces. With the growth of a number of wireless access technologies, it would be advised to enhance the user experience by allowing the mobile node or the network to switch between different access-technologies depending on QoS, coverage and cost effectiveness of each of those technologies instead of the user doing it manually. It would also enable true seamless mobility. IEEE, in an effort to address this demand, has come up with a novel approach: Media Independent Handover services standardized as IEEE 802.21. Different functionalities of 802.21, its services and handover procedures are explained in this paper Introduction

A research study report by ARC Chart estimated that Heterogeneous Networks (Hetnets) would push the global mobile infrastructure market to be worth $57 Billion by 2017 [1]. Hetnets revolve around the idea of coexistence of different wireless technologies. The foremost of these wireless technologies include the cellular technologies of 3GPP, LTE and 4G, IEEE 802.16, IEEE 802.11 and IEEE 802.20 (Wireless Broadband Mobile Access or WBMA). With the growth of cellular technologies, many telecommunication companies are looking to offload their data usage to IEEE 802.11 or Wi-Fi and small cell networks. WMBA promises to provide seamless connectivity for vehicular environments and thus is sought as a tool for high speed vehicular communication in terms of data transfers. IEEE 802.16 or WiMAX, often termed as ‘last-mile communication’ promised to provide high speed high speed internet communication over vast areas. Many other wireless technologies are being developed for efficient use of spectrum and the white spaces in the spectrum. This creates a complex picture of heterogeneous wireless technologies working in the same environment. The main challenge in this environment is to maintain connectivityand true mobility between these heterogeneous networks. To achieve this goal, handovers between different nodes of the same access technology is not enough. True vertical handover is necessary. So if a personal digital assistant (or PDA) can connect to cellular technologies and Wi-Fi, the user might want to switch between the two technologies without disrupting the current session. Achieving this would enable true seamless mobility between different access technologies. In this context, IEEE developed a standard to assist handovers amongst different heterogeneous wireless technologies - Media Independent Handover Services (MIH) for LAN and MAN or also called as IEEE 802.21 in 2008. The standard mainly resolves to improve user experience in terms data connectivity between different IEEE 802 technologies and cellular technologies by empowering handovers between these heterogeneous wireless access technologies. Section II explains the working of IEEE 802.21, in brief. For standardizing the handover procedure the IEEE 802.21 defined certain objectives and goals for its development and deployment. To enable the handover the standard defines a set of Service Access Points (or...
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