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Title : Motivation for Network Controlled Handoffs using IP
mobility
between heterogeneous Wireless Access Networks
Author(s) : E. Njedjou et al.
Filename : draft-njedjou-inter-an-handoffs-00.txt
Pages : 12
Date : 2003-6-11
In the near future, multi-interfaces Mobile Nodes will be used for
connecting to the Internet by way of a multitude of Radio Access
Networks including 802.11 based WLANs, GPRS, CDMA2000 and 3G based
cellular networks. Ensuring the non-disrupted flow of real-time
applications data, as well as adhering to subscribed service profiles
while the Mobile Node moves between Access Networks of different
technologies, is an issue that needs to be addressed. It is assumed
that a unified and external IP core network is used to support such a
multitude of Access Networks. This will probably be the case for a
mobile network operator intending to benefit its subscribers with its
own hot-spots broadband internet access. Consequently, the need
arises to define managed handoff mechanisms between heterogeneous
attachment networks, while providing service continuity to the Mobile
Node.
As such, information necessary for the Mobile Node to performing a
judicious handoff across Wireless Access Networks, will have to be
gathered from the involved Access Networks, transferred across the IP
network that interconnects them, to the operators home network.
This document discusses the desirability of a network controlled
handoff process for optimizing inter-Access Network Mobile Node
mobility. The approach presented provides the means for the operator
home network to achieve the best possible selection of the Mobile
Node target Access Network for handoff, on the basis of information
gathered on the most relevant nodes. It introduces a new function
located in the operator network and referred to as a Mobility
Manager. It also introduces the concepts for implementing such a
handoff process to make it compatible with Mobile IPv6. Other
documents will be needed to specify the protocol structures that are
intended for handling the handoff process hereafter described.
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