Transcript A Mobile-IP Based Mobility System for Wireless Metropolitan Area

A Mobile-IP Based Mobility System
for Wireless Metropolitan Area Networks
Chung-Kuo Chang;
Parallel Processing, 2005. ICPP 2005 Workshops.
International Conference Workshops on 14-17 June 2005
page(s):429 - 435
Presented by Jen-Hung Liao
2006/04/04
Outline
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Introduction
Related Work
Architecture WiMax Networks
Mobile-IP Based Handoff
The Prototype Mobile System
Performance Analysis
Conclusion
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Introduction
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The success of WiFi network with
IEEE802.11x technology
Cellular based – 3G network
WiMax solution based on IEEE802.16
technology
– IEEE802.16a
– IEEE802.16e
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WiMax is beyond the capability of WiFi
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Introduction (cont.)
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WiMax is required to support low
latency of less than 100ms and zero
packet loss during handoffs
A metropolitan network will consist of
various wireless accessing technologies
WiMax success depends on the
integration of mechanisms to deal with
handoffs
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Related Work
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Fast and seamless for intra-domain mobility
– The hierarchical MIP scheme is one of the
favorites mechanism
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The design of gateway has a strong influence
on our design as well
A metropolitan network consists of multiple
technologies where various vertical handoff
mechanisms are an integral part of such
heterogeneous networks
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Architecture of WiMax
networks
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A typical metropolitan network
– consists of one (or more) Base Station (BS) that
is connected to the internet infrastructure and a
group of Mobile Subscriber Stations (MSS)
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IEEE802.16a
IEEE802.16e
Mobility Agent
– Acts as the termination points of the tunnel
carrying data from the home network of the MSS
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Architecture of WiMax
networks (cont.)
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Mobile-IP based handoff
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Mobile-IP
– Mobile-IP allows a mobile node to move
form one place to another without
changing its home address
– The handoff latency in a Mobile-IP
includes the time taken to register the
mobile node’s location and time taken to
configure a new care-of address
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Mobile-IP based handoff
(cont.)
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In case of WiMax
– It implement the mobility management
system following the Mobile-IP
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Drawbacks in the MAN
– Mobile-IP is a network layer solution
– Messages sent to the MMS that long delay
due to the tunneling
– It doesn’t supporting handoff of
heterogeneous network
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Hierarchical micro-mobility
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MAN is intended to cover an area of 30
miles in radius
Two kinds of mobility can be defined
according to the mobile user’s
movement pattern
Hierarchical Mobile-IP is intended to
reduce the handoff latency
MAP makes nothing is to be
communicated with the home agent
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Hierarchical micro-mobility
(cont.)
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Vertical handoff
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The handoff in Mobile-IP is horizontal
handoff
Vertical handoff mechanism which covers
handoff over different wireless technologies
Mobile user could switch between different
access technologies
It must be provided in software consistently
between the BS and mobile user
It will monitor the signaling strength to
decide the proper technology and time to
switch over
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Vertical handoff (cont.)
Local area
Satellite
High end
本地范围
Wide Area
High speed moving
Low speed moving
software agents + hardware support for heterogeneity management
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Fast handoff
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Hierarchical micro-mobility still takes 300ms
to 400ms of delay time during handoff
The fast handoff scheme intends to reduce
the handoff delay by minimize the address
resolution delay time
It achieves this by pre-configuration of the
care-of address in the visiting network
The MSS to broadcast its knowledge to the
potential target BS so that they can decide
the context of the car-of-address before the
handoff is initiated
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Network mobility
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Access points deployed on a public transportation
The protocols are hierarchical based for
supporting seamless connectivity of mobile hosts
The Mobile Router which acts as a gateway
The MR would act as the foreign agent and
provide a foreign agent care-of address to the
mobile nodes.
Packets addressed to the mobile nodes within the
mobile network go through the MR's Home Agent
as well as the mobile node's Home Agent.
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Mobile router運作示意
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The prototype mobility system
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Soft ware modules
– It follows the HMIP designs to include the
MAP
– There are six major components in the
mobility manager:
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Foreign agent module
Tunneling module
Link Monitor module
QoS module
Security module
Billing module
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Handoff procedure
MSS
beacon
Serving BS
Target BS
beacon
Registration Request
Handoff Initiation
Handoff Decision
Handoff Decision
Bind Update
Handoff ACK
Handoff ACK
Data Packets
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Metropolitan medical network
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Its primary goal is to provide real time sharing
of clinical and laboratory data amongst
medical hospitals and other health entities
This type of network is very advantageous for
both patients and the health providers
Emergency physicians can obtain in real time
the patient data and medical images over the
network when the patient is in transit on the
ambulance
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Metropolitan medical network
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Performance Analysis
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Mobility mechanisms based on other
technologies have also been proposed
– MPLS techniques
– WiBro technology
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It has been using the ns-2 simulator to
study performance, it is based on a fixed
network topology and a variation on the
radius of the signal
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Performance Analysis (cont.)
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Conclusion
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It presents as a challenge to introduce
mobility into wireless metropolitan networks
The proposed solution to reduce the
overheads associated with fast moving users
The effectiveness of WiMax will be tested
when the concept of wireless city becomes
popular and the usage of broadband
handheld devices becomes the mainstream
of daily life
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