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An Enhancement of Mobile IP by Home Agent Handover
Advisor : Chun-Chuan Yang Speaker : Li-Sheng Yu June 23, 2005
Reference: “An Enhancement of Mobile IP by Home Agent Handover,” Proceedings, IEEE 62nd Semiannual Vehicular Technology Conference (VTC-2005Fall), 25-28 Sept. 2005.
http://www.csie.ncnu.edu.tw/~ccyang/Publication/VTC2005Fall-3.pdf
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Outline Introduction Home Agent Handover in Mobile IP (HH-
MIP) HH-MIP Multicast Extension (HH-MIP/ME) Conclusion
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Foreign Network (FN)Home
Agent (HA)
Foreign Agent (FA)
Tunneling
Correspondent Node (CN)
1
23
Mobile Host (MH)
Internet
Mobile IP Data Delivery
Home Network (HN)
Conventional datagram
Tunneled datagram
Disadvantage :1. Triangular Routing Problem 2. Long Handoff Delay
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FN
HA
FA
CN
MH
Internet
Route Optimization (ROMIP) Protocol Overview
HA
oFA
CN
Internet
nFA2
1
3
Disadvantage :Large Signaling Overhead
Control packetsnFA : new FA
oFA : old FA
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FN
HA
FA
CN
MH
Internet
HH-MIP Concept
HNIs there possible to make HA always close to MH ?
THA
THA :
Temporary Home Agent
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Flow Diagram for Data Delivery in HH-MIP
CN HA THA FA(MH)
MW
MRMU
MA
Control messages: MW = Binding Warning MessageMR = Binding Request MessageMU = Binding Update MessageMA = Acknowledgement Message
Conventional datagrams
Tunneled datagrams
SESSION
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THA Selection in HH-MIP
Initially HA is the MH’s THA
HA
FA1
FA2
MH
If Distance (FA2, HA) < Distance (FA2, THA) then/*** MH is moving closer to its HA ***/
HA is selected as the new THA Else if Distance (FA2, THA) > Distance (FA1, THA) /*** MH is moving away from its previous THA ***/FA2 is selected as its new THAElse
MH’s THA remains the sameTHA
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Flow Diagram for THA Handover
CN HA old-THA
Conventional datagrams
Tunneled datagrams
new-FA (MH)new-THA
Movement & THA Handover
old-FA
Tunneled lost datagrams
MU MUMW
MRMU MA
SESSION
Control messages: MW = Binding Warning MessageMR = Binding Request MessageMU = Binding Update MessageMA = Acknowledgement Message
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HA
FA1 FA2 FA3
Internet
CN
MH MHMH
Dynamic Hierarchical Mobile IP (DHMIP)
IEEE Journal on Selected Area in Communications, Volume: 22, Issue: 4, May 2004
Location registrationConventional datagram
MH movement
Tunneled datagram
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Simulation Environment
8 x 8 Mesh Network
CN
MH
Simulation Period : 500 time slotsMove Probability : 0.2~0.9
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Signaling Cost
0
1
2
3
4
5
0.2 0.5 0.7 0.9Moving Probability
Avg.
# of C
ontro
l Pack
ets .
HH-MIPROMIPMIPDHMIP
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Handoff Latency
0
1
2
3
4
5
0.2 0.5 0.7 0.9Moving Probability
Hop C
ount
.
HH-MIPROMIPMIPDHMIP
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End-to-End Path Length
0
2
4
6
8
10
12
0.2 0.5 0.7 0.9Moving Probability
Hop C
ount
.
HH-MIPROMIPMIPDHMIP
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HH-MIP/Multicast Extension (HH-MIP/ME) Related Work Protocol Overview Performance Evaluation
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Related Work
Multicast Sender
MH1
FA1 FA2
Multicast Sender
MH1 MH2
FA1
HA1 HA2
FA2
TunnelingMulticast Tree LinkJoin message delivery
Remote Subscription Bi-directional Tunneling
MoM : an enhancement of Bi-directional Tunneling
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HA
FA
MH1 MH2 MH3
Data Duplication and Tunnel Convergence Problem
Internet
Multicast Sender
HA1 HA3HA2
FA
MH1 MH2 MH3Data Duplication Tunnel
Convergence
Tunneling
Multicast Tree Link
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DMSP HandoffMulticast Sender
MH1 MH2
FA1
HA1 HA2
Multicast Sender
MH1 MH3
FA1
HA1 HA2
FA2
MH2MH3
HA3 HA3
DMSP DMSP DMSP
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Multicast Sender
MH1 MH2 MH3
FA1
HH-MIP/ME Data Delivery
THA1 THA2 THA3
FA2 FA3
MH4
Multicast Sender
MH2 MH3
FA1
THA1 THA2 THA3
FA2 FA3
MH4MH1
THA1 = MH1,MH2THA2 = MH3THA3 = MH4
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Multicast Sender
MH1 MH3
HH-MIP/ME During THA Handover
FA1 THA2 FA3
THA1 THA3
1 2Tunneling
Join message deliveryMulticast Tree Link
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Performance Evaluation
8 x 8Mesh Network
Multicast Sender
MH
Simulation Period : 500 time slot
Move Probability : 0.2~0.9Group Size : 10~50 MHs
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End-to-End Path Length
0
100
200
300
400
10 20 30 40 50Group member size
Hop c
ount
.
HH-MIP/MERSMoM
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Tree Maintenance Overhead
Tree Maintenance Overhead at moveProb = 0.2
0
5
10
15
20
10 20 30 40 50Group member size
Avg.
# of c
ontro
l pac
kets
HH-MIP/MERS
Tree Maintenance Overhead at moveProb = 0.9
02040
6080
100
10 20 30 40 50Group member size
Avg #
of co
ntrol
pack
ets
HH-MIP/MERS
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Number of DMSP Handoff
0
0.1
0.2
0.3
0.4
10 20 30 40 50Group member size
Avg.
# of D
MSP h
ando
ff .
HH-MIP/MEMoM
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DMSP Handoff Latency
0
2
4
6
10 20 30 40 50Group member size
Hop c
ount
.
HH-MIP/MEMoM
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Conclusion HH-MIP uses THA to reduce :
Triangular routing Handoff latency Signaling cost
HH-MIP/ME : HH-MIP based Multicast Extension A hybrid of MoM and RS