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Fast-integrated handover scheme with NEMO support in IEEE 802.16e BWA
networks
Lei ZHONGSchool of Electronics and Information Engineering, Tongji University, P.R. China
Fuqiang LIUSchool of Electronics and Information Engineering, Tongji University, P.R. China
Yusheng JINational Institute of Informatics (NII) and The Graduate University for Advanced Studies, Japan
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Outline Introduction Related work Proposed algorithm Analysis and results Conclusion
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Introduction -demand
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Introduction -NEMO scenario
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Outline Introduction Related work Proposed algorithm Analysis and results Conclusion
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Related work Mobile IPv6 Fast Handovers over IEEE 802.16e Networks
(FH80216e) advantage
To solve the problem of unacceptable latency for real-time services, FMIPv6 was proposed to performs part of the time-consuming process before actual mobile node handover, reducing handover latency. FH80216e describes how FMIPv6 could be implemented on link layers conforming to the 802.16e specification by introducing some cross-layer triggers.
Shortcomingsboth the two layered handover mechanisms still operate alternately, not in parallel. mainly designed for the node mobility scenarios, suffers from bad performance when serving moving networks due to its extra encapsulation.
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Related work
Internet
HA
NAR
MR
CN
MN
MN
PAR
MNTunnel
NEMO basic support protocol Advantage
provides native NEMO handover.
Shortcomingsproduces high handover latency due to have no consideration of link-layer handover.
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Internet
HA
NAR
MR
CN
MN
MN
PAR
MN
Related work
Tunnel
NEMO basic support protocol Advantage
provides native NEMO handover.
Shortcomingsproduces high handover latency due to have no consideration of link-layer handover.
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Outline Introduction Related work Proposed algorithm Analysis and results Conclusion
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Proposed algorithm Network model
The typical NEMO scenario is a vehicular network, with the vehicles moving mostly along roads, rails, or flight paths.
In such a scenario, advance preparation for an impending handover works quite well.
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Proposed algorithm Handover operation
L2L3
MR Serving BS
Target BS NARPAR HA
MOB_NBR-ADV
MOB_MSHO-REQ
MOB_BSHO-RSP
MOB_HO-IND
Packet tunnelingPacket tunnelingED
LGD FBU
FBACK
HACK
HI
FBACK
LSW
LUP
FNA
DPacket tunneling
Scan procedure
Link layer re-establishment
R
R
CN
Packet forwarding
EPacket tunneling Packet forwarding
B
(PrRtAdv)
HO threshold
Negotiation
E Encapsulation D Decapsulation R Routing BufferingB Data packet
DAD
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Outline Introduction Related work Proposed algorithm Analysis and results Conclusion
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Analysis and results parameters:
Tframe: Frame duration of IEEE 802.16e OFDMA PHY. TBS_nego: Negotiation delay between the serving BS and the re
commended BS in ms. TL2_entry: Latency of IEEE 802.16e network re-entry procedure. Thop: Delay of every routing hop in a wired backbone networ
k. Nnar_ha: Distance between the NAR and the HA in hops. Npar_ha: Distance between the PAR and the HA in hops. Npar_nar: Distance between the NAR and the HA in hops. Tdad: Time needed to perform a DAD process. Tcn_ha: Link delay between CN and HA.
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Analysis and results Expressions:
Handover latency
Service disruption time
2_FINEMO FINEMO
prepare L entry fnaT T T T
2_BNEMO BNEMO
prepare L entry coa buT T T T T 80216 80216
2_FH e FH e
prepare L entry fnaT T T T
2_FINEMO L entry fnaD T T
2_BNEMO L entry coa buD T T T 80216 2_FH e L entry fnaD T T
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Analysis and results
Handover latency for different frame durations
Handover latency for different distances between MR and HA
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Analysis and results
Disruption time for different frame durations Disruption time for different distances between MR and HA
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Outline Introduction Related work Proposed algorithm Analysis and results Conclusion
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Conclusion achieves a lower handover latency
and service disruption time and, with a buffered router, supports even seamless handover in the network.
Compatible and works well together with FH80216e, which supports node mobility.
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Thanks for your attention.Any question?
