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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?