My Research Themes

Dr. Tarik TALEB, Ph. D

Assistant Professor

Graduate School of Information Sciences

Tohoku University, Sendai, Japan

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Research Projects

Next Generation Wireless Communications Systems Transmission protocols Mobility management and QoS Routing Protocols On-Demand Multimedia Transmission

Internet Security Internet Worms Trace back of DoS Attacks Intrusion Detection Systems

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REFWARecursive, Explicit, and Fair Window Adjustment A new transport protocol to efficiently and fairly adjus

t the sending rates of TCP connections in broadband satellite communication systems

DSBPDummy Segment-based Bandwidth Probing A novel technique to improve the efficiency of TCP in

heterogeneous wireless networks

Transmission Protocols for Wireless Commun.

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REFWA: Recursive, Explicit, and Fair Window Adjustment

• T. Taleb, N. Kato, and Y. Nemoto, "REFWA: An Efficient and Fair Congestion Control Scheme for LEO Satellite Networks", in IEEE/ACM Transactions on Networking Journal, Oct. 2006.• T. Taleb, N. Kato, and Y. Nemoto, "An Explicit and Fair Window Adjustment Method to Enhance TCP Efficiency and Fairness over Multi-Hops Satellite Networks", IEEE J. Select. Areas in Commun., Feb. 2004.

Aim: To find optimum sending rates for TCP

connections in NGEO broadband satellite systems

To solve issues related to handoff and unfairness due to RTT variance

Concept: Use of hops count to estimate connections

RTT

Use of RTT to compute the optimum sending rates of each TCP sender

Further applications: Multi-homing over hybrid wired/wireless

networks

A N o n-G eo s tatio nary S atellite N etw o rk in the S ky

D irec t U s ers

T erres trial W ired N etw o rk B

DESKPRO SB

D e s k P ro

In ternet S ervic e P ro vid er

G atew ay

S erver

Inte rne t

D e s k P ro

G atew ayD e s k P ro

G atew ayD e s k P ro

G atew ay

T erres trial W ired N etw o rk A

T erres trial W ireles s N etw o rks

DESKPRO SB

D e s k P ro

In te rne t S e rvic e P rovide r

G a te w a y

S e rve r

In te rn e t

Satellite Network

Terrestrial/Wireless Networks

DirectUsers

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Aim: To solve issues related to the bandwidth

disparity in heterogeneous wireless networks

Concept: Use of low-priority dummy segments to

probe bandwidth of the new network

Further applications: RTP/RTCP-based multimedia streaming

DSBP: Dummy Segment-based Bandwidth Probing

BS1 BS2

CorrespondentNode

HomeAgent

MobileNode

Dummy SegmentsData Traffic(TCP)

• T. Taleb, K. Kashibuchi, N. Kato, and Y. Nemoto, “A Dummy Segment Based Bandwidth Probing Technique to Enhance the Performance of TCP over Heterogeneous Networks”, IEEE WCNC 2005. • K. Kashibuchi, T. Taleb, A. Jamalipour, N. Kato, and Y. Nemoto, “A New Smooth Handoff Scheme for Mobile Multimedia Streaming using RTP Dummy Packets and RTCP Explicit Handoff Notification”, IEEE WCNC 2006.

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ELB (Explicit Load Balancing) A new routing protocol to better distribute traffic and to

accordingly alleviate congestion in Non-Geostationary satellite systems

VHRP (Vehicle-Heading based Routing Protocol) A stable and reliable routing mechanism for Inter-Vehicular

Communications to reduce the number of link breakage events and increase the end-to-end throughput in VANET networks

DEMAPS (Dynamic & Efficient MAP Selection) A dynamic MAP management strategy for the selection of the

most appropriate MAP with the lightest traffic load based on an estimation of MAP load transition.

Mobility Management and Routing QoS Protocols

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Aim: To deal with scenarios where some satellites get

congested while others remain underutilized

To better distribute traffic over the entire constellation, reduce congestion due packet drops, and to improve network utilization

Concept: Explicit & periodic exchange of information on

queue status among neighboring satellites

Applications: Delay insensitive applications Possible application to terrestrial networks

ELB: Explicit Load Balancing

•T. Taleb, A. Jamalipour, N. Kato, and Y. Nemoto, "IP Traffic Load Distribution in NGEO Broadband Satellite Networks", in Proc. of 20th Int. Symposium on Computer & Information Sciences, Oct. 2005. (Invited Paper)

Sender Receiver

Congested

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VHRP: Vehicle-Heading based Routing Protocol Aim:

To guarantee stable and reliable routes for communication

To reduce the number of link breakage events

To increase E2E throughput and to guarantee routing QoS in VANET networks

Concept: To group vehicles based on their velocity headings

and to establish routes among vehicles from same groups

Applications: Inter-Vehicular Communications Hotspots-to-Vehicles communications

• T. Taleb, M. Ochi, A. Jamalipour, N. Kato, and Y. Nemoto, " An Efficient Vehicle-Heading Based Routing Protocol for VANET Networks", in Proc. of IEEE WCNC 2006

N

F

C

D

B

A

D e stin a t io nSo u rc e

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Aim: To solve issues related to handoff management

in Mobile IPv6 networks

To better distribute traffic among MAPs

To alleviate congestion, to enhance network resources utilization, and to ultimately guarantee QoS

Concept: Use of Exponential Moving Average to predict

transitions of MAPS load

Applications: Mobile IPv6 networks

DEMAPS: Dynamic & Efficient MAP Selection

•T. Taleb, T. Suzuki, N. Kato, and Y. Nemoto, "A Dynamic and Efficient MAP Selection for Mobile IPv6 Networks ", in Proc. of IEEE Globecomm 2005.

AR3

Internet

MAP2MAP1

MAP4MAP3

AR1 AR2

AR4

MN

CorrespondentNode

HomeAgent

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NBB VoD (Neighbors Buffering Based VoD) An interactive and scalable scheme for the provision of VoD

service in multicast environments

Theatre in the Sky An architecture based on Quasi-GEO Stationary Satellites for

global streaming of on-demand multimedia services to hybrid networks made of both mobile and fixed users

On-Demand Multimedia Transmission

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NBB-VoD: Neighbors Buffering Based VoD

Aim: To increase the capacity of VoD servers and

the scalability of the system To efficiently utilize the network resources

(e.g. bandwidth)

Concept: Serve new users willing to join a session

from their neighbors, already members of the session

Applications: On-demand multimedia services in multicast

environments, distance learning…

• T. Taleb, N. Kato, and Y. Nemoto, "On-Demand Media Streaming to Hybrid Wired/Wireless Networks over Quasi-Geo Stationary Satellite Systems", Elsevier Journal on Computer Networks, Feb. 2005. •T. Taleb, T. Suzuki, N. Kato, and Y. Nemoto, "Neighbors-Buffering Based Video-on-Demand Architecture", Signal Processing: Image Communication, Aug. 2003.

Request

New UserOld User

Already transmitted portion

To be transmitted

Server

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Theatre in the Sky (1)

Metropolitan Server

Storage Data

(Popular Video)

Core Network

Local Service ManagerReplicated Data

Multicast (data)

Control Message

Current Channel

Upcoming Channel

Request Time

Unicast (data)

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Theatre in the Sky (2)

The Quasi-Geostationary Satellites Constellation

Inter-System LinksA Quasi-GSO system

Metropolitan Service Areas

• T. Taleb, A. Jamalipour, N. Kato, and Y. Nemoto, "A Theatre in the Sky: A Ubiquitous Broadband Multimedia-on-Demand Service over a Novel Constellation Composed of Quasi-Geostationary Satellites", to appear in Wiley Int. J. of Satellite Commun. and Networking.

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DoS Attacks in Mobile Networks Design of a prevention system to secure mobile networks from

high Rate TCP-based DoS attacks originated from malicious mobile users

Intrusion Detection System Development of a hybrid system for the detection, prevention,

and trace back of cryptographic protocol intrusions

Internet Worms An Efficient Signature-Based Framework for Early Detection of

Internet Worms over Large Scale Networks

Internet Security

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Securing Hybrid Wired/Mobile IP Networks

T. Taleb, H. Nishiyama, N. Kato, and Y. Nemoto, "Securing Hybrid Wired/Mobile IP Networks from TCP-Flooding Based Denial-of-Service Attacks", in Proc. of IEEE Globecomm 2005.

Aim: To demonstrate the inefficiency of trace back

techniques in mobile networks To design a prevention system to secure hybrid

wired/mobile networks from high Rate TCP-based DoS attacks coming from malicious mobile users

Concept: Send suspicious TCP senders a test feedback

requesting them to decrease their sending rates Judge senders’ legitimacy based on their

responsiveness

Applications: Security in mobile networks, WIMAX,

WLAN….

Server(Victim)

InternetInternet

BS

AR

Attacker

Tracingfails

Attack

Attacker

Attack

Change point of

attachment

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Early Detection of Internet Worms

Aim• To detect Internet worms and generate their

signatures at the early stage of their propagations

Concept• Information-sharing among hierarchically

placed security managers• Local managers: Collect worm-like or

suspicious flows• Metropolitan managers: Sort worms and

generate worm signature• Global manager: relays worm signature

Applications• worm detection in large scale networks

(e.g. universities, large enterprises, ...)

K. Simkhada, T. Taleb, Y. Waizumi, A. Jamalipour, N. Kato, and Y. Nemoto, "An Efficient Signature-Based Approach for Automatic Detection of Internet Worms over Large-Scale Networks," In Proc. of IEEE ICC, Istanbul, Turkey, Jun. 2006.

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