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My Research Themes
Dr. Tarik TALEB, Ph. D
Assistant Professor
Graduate School of Information Sciences
Tohoku University, Sendai, Japan
Research Projects

Next Generation Wireless Communications
Systems




Transmission protocols
Mobility management and QoS Routing Protocols
On-Demand Multimedia Transmission
Internet Security

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Internet Worms
Trace back of DoS Attacks
Intrusion Detection Systems
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Transmission Protocols for Wireless Commun.

REFWA
Recursive, Explicit, and Fair Window Adjustment
 A new transport protocol to efficiently and fairly
adjust the sending rates of TCP connections in
broadband satellite communication systems

DSBP
Dummy Segment-based Bandwidth Probing
 A novel technique to improve the efficiency of TCP in
heterogeneous wireless networks
2
REFWA: Recursive, Explicit, and Fair
Window Adjustment


Aim:
A Non-Geostationary Satellite Network in the Sky

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
Satellite Network
Direct Users
Direct
Users
Server
Server


Gateway
Gateway
De s k Pr o
De s k Pr o
DESKPRO SB
DESKPROSB
Internet
Internet
Gateway

Further applications:

Gateway
Gateway
D e s k P r
D e s k P r
D e s k P r
o
o
o
Internet Service Provider
Internet Service Provider
Terrestrial Wired Network A
Terrestrial Wired Network B
Terrestrial Wireless Networks
Terrestrial/Wireless Networks
Multi-homing over hybrid wired/wireless
networks
• 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.
3
DSBP: Dummy Segment-based Bandwidth
Probing

Aim:



Home
Agent
To solve issues related to the bandwidth
disparity in heterogeneous wireless networks
Concept:

Correspondent
Node
Data Traffic
(TCP)
Dummy Segments
Use of low-priority dummy segments to
probe bandwidth of the new network
Further applications:

RTP/RTCP-based multimedia streaming
BS2
BS1
Mobile
Node
• 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.
4
Mobility Management and Routing QoS
Protocols

ELB (Explicit Load Balancing)


VHRP (Vehicle-Heading based Routing Protocol)


A new routing protocol to better distribute traffic and to
accordingly alleviate congestion in Non-Geostationary satellite
systems
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
5
estimation of MAP load transition.
ELB: Explicit Load Balancing


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:


Congested
Sender
Receiver
Delay insensitive applications
Possible application to terrestrial networks
•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)
6
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
N
B
D
A
Destination
Source

Concept:


F
C
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
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DEMAPS: Dynamic & Efficient MAP
Selection


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:


Correspondent
Node
Home
Agent
Internet
MAP1
MAP2
MAP3
MAP4
Use of Exponential Moving Average to predict
transitions of MAPS load
AR1
AR2
AR3
AR4
Applications:

Mobile IPv6 networks
•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.
MN
8
On-Demand Multimedia Transmission

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
9
NBB-VoD: Neighbors Buffering Based VoD

Aim:



Concept:


To increase the capacity of VoD servers and
the scalability of the system
To efficiently utilize the network resources
(e.g. bandwidth)
Already
transmitted portion
To be transmitted
Server
Serve new users willing to join a session
from their neighbors, already members of
the session
Applications:

Request
On-demand multimedia services in multicast
environments, distance learning…
Old User
• 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.
New User
10
Theatre in the Sky (1)
Multicast (data)
Control Message
Unicast (data)
Metropolitan Server
Storage Data
(Popular Video)
Core Network
Current Channel
Upcoming Channel
Request Time
Local Service Manager
Replicated Data
11
Theatre in the Sky (2)
The Quasi-Geostationary Satellites Constellation
Inter-System Links
A 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.
12
Internet Security

DoS Attacks in Mobile Networks


Intrusion Detection System


Design of a prevention system to secure mobile networks from
high Rate TCP-based DoS attacks originated from malicious
mobile users
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
13
Securing Hybrid Wired/Mobile IP Networks

Aim:



Tracing
fails
Internet
AR
Concept:



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 TCPbased DoS attacks coming from malicious mobile
users
Server
(Victim)
Attack
Send suspicious TCP senders a test feedback
requesting them to decrease their sending rates
Judge senders’ legitimacy based on their
responsiveness
BS
Change
Attack point of
Applications:

attachment
Security in mobile networks, WIMAX, WLAN….
Attacker
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.
Attacker
14
Early Detection of Internet Worms

Aim
•

Metropolitan Area
Network B
Concept
•
•
•
•

To detect Internet worms and generate their
signatures at the early stage of their
propagations
Metropolitan Area
Network C
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, ...)
Metropolitan
Security Manager
Global
Security Manager
Local Network 3
Local Network 2
Local Network 1
Local
Security Manager
Metropolitan Area Network A
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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