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Media-independent handover
Media Independent Handover (MIH) is a standard being developed by IEEE 802.21 to enable the handover of IP sessions from one layer 2 access technology to another, to achieve mobility of end user devices.
==Importance==
The importance of MIH derives from the fact that a diverse range of broadband wireless access technologies is available and in course of development, including GSM, UMTS, CDMA2000, WiMAX, Mobile-Fi and WPANs. Multimode wireless devices that incorporate more than one of these wireless interfaces require the ability to switch among them during the course of an IP session, and devices such as laptops with Ethernet and wireless interfaces need to switch similarly between wired and wireless access.
Handover may be required, e.g. because a mobile device experiences a degradation in the radio signal, or because an access point experiences a heavy traffic load.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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