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home > research > monthly presentations > spring 2007
 

Spring 2007

 
spacer For the Spring semester 2007, the schedule of the monthly meetings and invited presentations at OpNeAR lab. is the following (Please check again for updates):
 
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Date
Time
Room
Speaker
Presentation Title
April 20, 2007 4:00 pm ECSN 4.702 Lakshmi Narasimhan Kannan Cooperative Communications in Multi-Hop Networking: a Case Study Based on the IEEE 802.11 Protocol
May 18, 2007 4:00 pm ECSN 4.728 Shovan Das A Link State Advertisement Protocol for Optical Transparency Islands
 

Presentation Abstracts

spacer Friday, April 20, 2007 - 4:00 pm - room ECSN 4.702

Cooperative Communications in Multi-Hop Networking: a Case Study Based on the IEEE 802.11 Protocol
Speaker: Lakshmi Narasimhan Kannan

The presented study combines multi-hop networking with single-hop cooperative communications. The solution is built upon the standard IEEE 802.11 protocol operating in the ad hoc mode. A simulation based comparison is carried out in order to evaluate the performance gains and benefit of cooperative communications applied to multi-hop networking. Preliminary results indicate that network performance in terms of both throughput and end-to-end delay improves. Additionally, cooperative communications increases robustness against uncertainties in the wireless channel.


spacer Friday, May 18, 2007 - 4:00 pm - room ECSN 4.728

A Link State Advertisement Protocol for Optical Transparency Islands
Speaker: Shovan Das

Plug and play optical (PPO) nodes enable fast, reconfigurable, and flexible ad hoc deployment of optical networks. Once plugged, the PPO nodes provide all-optical circuits between client nodes to alleviate the electronic processing bottleneck of high speed networks. To offer these wavelength routing functionalities to client nodes the PPO nodes must self-adjust to possible changes of the optical physical topology and fiber propagation characteristics. To discover such changes the PPO nodes must make use of a link state advertisement (LSA) protocol that is scalable in the number of plugged PPO nodes. This presentation describes a scalable LSA protocol with constrained message flooding to match the limited propagation reach of the optical signal, i.e., the PPO node transparency island (TI). Scalability is thus achieved naturally by limiting the link state advertisement scope to only those PPO nodes that need to receive the link updates. As discussed in the presentation, the proposed protocol appears to be a viable solution when the TI size is relatively small, e.g., in optical networks without signal regeneration.

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Open Networking Advanced Research Lab
Dept. of Electrical Engineering
The University of Texas at Dallas. USA.