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home > research > monthly presentations > spring 2005
 

Spring 2005

 
spacer For the Spring semester 2005, 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
January 21, 2005 12:00 pm ECSN #2.718 Paolo Monti Cooperative and Non-Cooperative ARQ Protocols for Microwave Recharged Sensor Nodes
February 25, 2005 12:00 pm ECSN #2.718 Kai Wu Local Recovery Solutions from Multi-Link Failures in MPLS-TE Networks with Probable Failure Patterns
 

Presentation Abstracts

spacer Friday, January 21, 2005 - 12:00 pm - room ECSN 2.718

Cooperative and Non-Cooperative ARQ Protocols for Microwave Recharged Sensor Nodes
Speaker: Paolo Monti

The Generic Autonomous Platform for Sensor Systems, or GAP4S, is a maintenance-free wireless sensor network in which the sensor battery needs not be replaced. Power is delivered to the sensor via a microwave signal that is radiated by a base-station. The base-station also acts as the entry point to a wider communication network, e.g., the Internet. The presentations will describe three automatic repeat request (ARQ) protocols that may be used in GAP4S to yield reliable and fair data transmission from the sensor nodes to the base-station. Two of the protocols take advantage of cooperative communication, whereby neighboring sensor nodes help during the retransmission process. The presented analysis on the saturation throughput of the ARQ protocols helps quantify the gain achievable when cooperative communication is used in GAP4S in a variety of working conditions.


spacer Friday, February 25, 2005 - 12:00 pm - room ECSN 2.718

Local Recovery Solutions from Multi-Link Failures in MPLS-TE Networks with Probable Failure Patterns
Speaker: Kai Wu

MPLS TE Fast Reroute proposes a local protection mechanism to quickly reroute protected TE LSPs onto pre-computed and signaled bypass tunnels. This paper explores the case of multiple network element failure scenarios. This undesired complexity inherent to the multiple failure scenario originates from the fact that the latter failure scenarios are more disruptive, and may require multiple bypass tunnels to cope with. The objective of the presentation is to adapt the MPLS local recovery schemes to multi-failure scenarios, while controlling the number of bypass tunnels that are required. This objective is achieved by mapping multi-failure scenarios onto Probable Failure Patterns (PFP's). PFP's are characterized by their probability (or frequency) of occurrence during the network lifetime. A number of bypass tunnels is then computed to effectively cope with the PFP's according to their frequency or probability of occurrence. It is shown that by properly choosing how the PFP's are grouped, and how the corresponding bypass tunnels are computed, it is possible to trade the required number of bypass tunnels for their average length and outage probability, i.e., the probability that the local recovery scheme cannot cope with the occurrence of a multi-failure pattern.


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