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A Seamless Handoff Approach of Mobile IP Protocol for Mobile
Wireless Data Network.
資研一 黃明祥
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Overview
AbstractIntroductionOverview of Mobile IPA Seamless Handoff ApproachSimulation and ResultsConclusion
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AbstractToday, mobile high-bandwidth data comm
unications are becoming the next candidate of new targeting business.
In what kind of approach we could make the communication more comfortable and more correct ?
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IntroductionMobile IP technique is the most common
solution for offering seamless roaming to mobile devices.
There are many problems associated with Mobile IP.
Such as : Triangular routing, about
tunneling management, etc.
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Triangular routing problem
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How to solve that problems?
Route optimization is proposed by using binding update.
In this paper, it proposes a seamless handoff mechanism to modify Mobile IP protocol.
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ApproachPropose an efficient handoff scheme in a r
outing table.
(named Mobile Routing Table. MRT)
Propose a packet retransmission scheme to reduce the packet loss.
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Overview of Mobile IP
Main Components of MIP.
Basic Operations of MIP.
Problems in MIP.
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Main Components of MIP
Home Network :the network provide to which MN is registered. (the address is Home Address.)
Foreign Network :every other a MN can connect.
Care-of Address (CoA)IP that MN registers with its home agent.
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Main Components of MIP
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Basic Operation of MIP
Agent Advertisement messages.Mobile Agent Discovery.Registration.Tunneling.Binding Update.Foreign Agent Smooth Handoffs.
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Problems in MIPMIP has a triangular routing problem with
a MN roaming from HA to FA.
It causes two problems :。 Longer packet transmission time.。 The handoff process results in packet loss.
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A Seamless Handoff Approach
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Difference
Standard Mobile IP :implement a binding cache.
Our Approach :construct an MRT in each mobile agent.(including HA, FA, and router)
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Mobile Routing Table (MRT)
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Example of MRT
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The State Transition
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MRT Registration/Update (1/2)
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MRT Registration/Update (2/2)
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The Proposed Handoff Scheme
Packet transmission CN→MN.
Packet transmission MN→CN.
Inter-network handoff.
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CN→MN (1/2)
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CN→MN (2/2)
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MN→CN
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MN Inter-Network Handoff
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Packet Retransmission Mechanism
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Comparison (1/2) Δ1 : From MN to HA or FA. Δ2 : From FA to MN. Δ3 : From HA to FA or from previous FA to new
FA.
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Comparison (2/2) T : Traffic between MN and CN.
N : The numbers of MNs that move from HA to FA.
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Simulation and Results (1/4)
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Simulations and Results (2/4)
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Simulations and Results (3/4)
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Simulations and Results (4/4)
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Conclusion
Based on MRT scheme, it can :
。 avoid the triangular routing problem.
。 a packet retransmission scheme to reduce packet loss during handoff.