1. A Cognitive Approach for Cross-Layer Performance Management
Miami, December 7th, 2010
A Cognitive Approach for Cross-Layer Performance Management
Neumar Malheiros University of Campinas, Brazil
Edmundo Madeira
Nelson da Fonseca
Dzmitry Kliazovich University of Luxembourg, Luxembourg
Fabrizio Granelli University of Trento, Italy

2. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Introduction
Performance management is a challenging issue:
Heterogeneous and dynamic networks
Increasingly level of complexity
Stringent QoS requirements
December 7, 2010
Dzmitry Kliazovich

3. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Problem
Limitations of current Internet protocols
No adaptation mechanism for dynamic network environments
No coordination between network layers
Centralized network management solutions
There is a clear need for new configuration and performance management solutions.
December 7, 2010
Dzmitry Kliazovich

4. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Proposed Solution
CogProt: Cognitive approach for dynamic reconfiguration of communication protocols
Cognitive algorithm for dynamic adjustment of protocol parameters
Cross-layer design
System-wide goals
December 7, 2010
Dzmitry Kliazovich

5. Cognitive Self-Configuration
Performance optimization is obtained by periodically reconfiguring protocol parameters through a quality feedback loop
System-wide performance optimization
Cognitive processes
Learning
Decision-making
December 7, 2010
Dzmitry Kliazovich

6. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Quality Feedback Loop
December 7, 2010
Dzmitry Kliazovich

7. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Quality Feedback Loop
December 7, 2010
Dzmitry Kliazovich

8. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Design Scenarios
Single-Layer X Inter-Layer Scenarios
December 7, 2010
Dzmitry Kliazovich

9. Signaling Architectures
Centralized X Distributed architectures
December 7, 2010
Dzmitry Kliazovich

10. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Case Study
Joint optimization of multiple parameters
TCP congestion window increase factor
MAC data rate
Network Simulator (ns-2)
The simulator was extended with CogProt functionalities
December 7, 2010
Dzmitry Kliazovich

11. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Simulated Topology
Three scenarios:
Node S fixed close to BS
Node S fixed far away from BS
Node S moving
December 7, 2010
Dzmitry Kliazovich

12. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Performance Results
No cross-traffic; S close to BS
December 7, 2010
Dzmitry Kliazovich

13. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Performance Results
No cross-traffic; S far from BS
December 7, 2010
Dzmitry Kliazovich

14. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Performance Results
With Cross-traffic ; S close to BS
December 7, 2010
Dzmitry Kliazovich

15. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Performance Results
With Cross-traffic ; S far from BS
December 7, 2010
Dzmitry Kliazovich

16. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Performance Results
On/off Cross-traffic; S in movement
December 7, 2010
Dzmitry Kliazovich

17. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Summary
Cognitive TCP
Self-configuration of TCP window increase factor
Cognitive MAC Layer
MAC data rate adaptation
Self-configuration of MAC layer parameters
Inter-layer optimization
December 7, 2010
Dzmitry Kliazovich

18. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Conclusion
CogProt’s dynamic reconfiguration keeps protocol operating point at optimum
Low implementation complexity fosters wide deployment in large variety of network devices
Excellent for incremental deployed
Requires no changes to protocol messages and operation
Wide range of tuning parameters
December 7, 2010
Dzmitry Kliazovich

19. Dzmitry Kliazovich (kliazovich@disi.unitn.it)
Future Work
Implementation of the algorithm in Linux kernel for real experiments
Code available at
Further development of Cognitive Information Server (CIS) architecture
Extending signaling mechanisms for cognitive information sharing
December 7, 2010
Dzmitry Kliazovich