Department of Electrical and Computer Engineering
University of Wisconsin - Madison
Computer Engineering Seminar
(Fall 2009-2010)

        Speaker:    Chin-Ya Huang
        Time:       12:00 pm 
        Date:       October 23, 2009    
        Location:   Room 4610, Engineering Hall 
        Subject:    Enhancing TCP throughput in Wireless Mesh Networks
 

As usual soft drinks will be available for those who show up in
time for the seminar. 

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              Enhancing TCP throughput in Wireless Mesh Networks        

                                      by

                                  Chin-Ya Huang 
               Department of Electrical and Computer Engineering
                       University of Wisconsin – Madison
                         Madison, Wisconsin 53706 - 1691

Abstract:

Wireless Mesh Network (WMN) is known to provide better performance than 
other personal, local, and metropolitan wireless networks, such as 
Wireless Local Area Network and WiFi. In WMNs, each link has different 
capacity, and traffic flows enter and leave networks dynamically. When 
link capacity and buffer are not large enough to support the incoming 
traffic flows, traffic congestions occur, which in turn result in 
packet loss and low Transport Control Protocol (TCP) throughput. To 
solve this TCP congestion problem, we incorporate network coding with 
multi-path routing to achieve high TCP throughput.  

In this presentation, we propose a Spare Bandwidth Rate Adaptive 
network coding scheme (SBRA) to improve TCP throughput in the presence 
of congestion. In SBRA, each ingress node forwards packets after 
network coding. Each intermediate node also adaptively uses network 
coding before forwarding the packets to the outgoing links. Then, each 
egress node decodes the network coded packets before forwarding them to 
the destinations. The key feature of SBRA is that each node adapts its 
network coding rate based on the available bandwidth on the outgoing 
links, such that the egress nodes can decode the packets with higher 
probability without significantly affecting the cross-traffic. 
(Effectiveness of the proposed scheme is evaluated using simulation.) 
The simulation results show that the proposed scheme can effectively 
use the available bandwidth on each link to significantly improve the 
end-to-end performance of TCP flows.


Biography: 

Chin-Ya Huang is a Ph.D. student under the supervision of Professor 
Parameswaran Ramanathan in the Dept. of Electrical and Computer 
Engineering at University of Wisconsin-Madison. She obtained her B.S 
and M.S. degree from National Central University, Taiwan and National 
Chiao-Tung University, Taiwan, in 2004 and 2006, respectively. Her 
research interests include computer networks and wireless 
communication.