Sayandeep Sen's Research

under Prof. Bhaskaran Raman and Prof. Kameswari Chebrolu

WiFi-based Rural Data ACcess and TELephony (FRACTEL) is an extension of the Digital Gangetic Plains (DGP). DGP dealt with adapting 802.11 technology for long distance operations, to be used to form a backbone access network connecting villages to corresponding district headquarters.

FRACTEL on the other hand assumes the presence of a single point of connectivity per village and deals with providing voice/data services to each house/user in it. The work is challenging because of the following reasons,

* The behaviour of wireless media in rural settings has not been characterised (yet).
* A single point of connectivity constraints the amount of bandwidth available.
* Cost constraints make a Roofnet like deployment (unplanned, every user has radio hardware) infeasible.
* Also the power supply is erratic in rural setting (esp. in India).

I worked on the following issues of the project,

* I carried out measurements for characterizing properties of the wireless medium in rural settings.
(See "INFOCOM08" paper)
* I worked on formulation of network architecture as well as designing of MAC and routing protocols for the above networks.

(August'06-May'07)

Digital Gangetic Plains

under Prof. Bhaskaran Raman and Prof. Kameswari Chebrolu

My work in the project involved the following

1.DGP measurement study:

I have worked under Prof. Kameswari Chebrolu and Prof. Bhaskaran Raman to carry out the first detailed performance study of long-distance 802.11 links at various layers of the network stack.
(See "MOBICOM06" paper)

2.Topology planning:

I worked on designing algorithms for planning of long distance wireless mesh networks as part of my Master's thesis. (See WWW07 paper)

3.Economic Viability of Wi-Fi based Rural Telephony Service:

I have worked under Prof. Bhaskaran Raman on studying the social and economic aspects of providing telephony service using VoIP over a 802.11b link (37 Km) at a village. The current deployment was found to
be loss making and hence, not suitable for replication. However we proposed an optimal infrastructure deployment and a new business model for profitable functioning of the service.
(See "ICTD06"paper)

(August'05-July'06)





xx	x	Research Interests	x	xx
				I like to work in the area of Mobile and wireless networking systems. I am intetersted in development (protocol/ application/ algorithm), measurement and analysis of such systems.

xx	x	Current Work	x	xx
				Wireless Network Coding under Prof. Suman Banerjee I am currently working on design and implementation of wireless network coding algorithms. My focus is on investigating the necessary changes at various layers of traditional protocol stack to facilitate network coding. (August'07-Present)

xx	x	Past Work	x	xx
				FRACTEL under Prof. Bhaskaran Raman and Prof. Kameswari Chebrolu WiFi-based Rural Data ACcess and TELephony (FRACTEL) is an extension of the Digital Gangetic Plains (DGP). DGP dealt with adapting 802.11 technology for long distance operations, to be used to form a backbone access network connecting villages to corresponding district headquarters. FRACTEL on the other hand assumes the presence of a single point of connectivity per village and deals with providing voice/data services to each house/user in it. The work is challenging because of the following reasons, * The behaviour of wireless media in rural settings has not been characterised (yet). * A single point of connectivity constraints the amount of bandwidth available. * Cost constraints make a Roofnet like deployment (unplanned, every user has radio hardware) infeasible. * Also the power supply is erratic in rural setting (esp. in India). I worked on the following issues of the project, * I carried out measurements for characterizing properties of the wireless medium in rural settings. (See "INFOCOM08" paper) * I worked on formulation of network architecture as well as designing of MAC and routing protocols for the above networks. (August'06-May'07) Digital Gangetic Plains under Prof. Bhaskaran Raman and Prof. Kameswari Chebrolu My work in the project involved the following 1.DGP measurement study: I have worked under Prof. Kameswari Chebrolu and Prof. Bhaskaran Raman to carry out the first detailed performance study of long-distance 802.11 links at various layers of the network stack. (See "MOBICOM06" paper) 2.Topology planning: I worked on designing algorithms for planning of long distance wireless mesh networks as part of my Master's thesis. (See WWW07 paper) 3.Economic Viability of Wi-Fi based Rural Telephony Service: I have worked under Prof. Bhaskaran Raman on studying the social and economic aspects of providing telephony service using VoIP over a 802.11b link (37 Km) at a village. The current deployment was found to be loss making and hence, not suitable for replication. However we proposed an optimal infrastructure deployment and a new business model for profitable functioning of the service. (See "ICTD06"paper) (August'05-July'06)




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