NDLI: Experimental study of link and transport protocols in interference-prone wireless LAN environments

Content Provider	IEEE Xplore Digital Library
Author	Subramanian, V. Ramakrishnan, K.K. Kalyanaraman, S.
Copyright Year	2009
Description	Author affiliation: IBM India Research Labs, India (Kalyanaraman, S.) \|\| ECSE Dept, RPI, USA (Subramanian, V.) \|\| AT&T Labs (Research), USA (Ramakrishnan, K.K.)
Abstract	As wireless networks are deployed widely and user expectations grow, it is important to study the trade-offs among goodput, latency and loss rates that exist in link and transport protocols. Under low residual loss rates, retransmissions can be effective in bringing down the loss rate. However, at high loss rates, current links trade-off goodput and low latency for a small loss rate which diminishes overall performance. We look at the performance at the link and transport layers in the presence of raw loss and see how current protocols make an unattractive trade-off at the link layer. We also show high ARQ on the link can cause high per-packet latency on the link which can lead to interactions with TCP mechanisms leading to spurious retransmissions and timeouts and reduced TCP-layer goodput. Our measurements results, based on experiments conducted on the ORBIT testbed, show the need for modifications to the link layer to obtain a favorable three-way trade-off. In prior work, we have developed link and transport protocols that are designed to work under high loss rates. Our link design LL-HARQ (hybrid FEC/ARQ) is designed to minimize the link delay while exporting a very small residual loss rate and high goodput while our transport protocol Loss-Tolerant TCP is designed to operate over a wide range of residual loss rates. We provide insights about the balance between error-protection functions at the two layers and examine the case for cross-layer co-operation. The measurement traces were used as inputs to our simulations on the ns-2 simulator. Our results show the favorable trade-offs among goodput/latency/loss rate obtained with our approach over traditional approaches.
Starting Page	1
Ending Page	10
File Size	963353
Page Count	10
File Format	PDF
ISBN	9781424429127
DOI	10.1109/COMSNETS.2009.4808880
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-01-05
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transport protocols Wireless LAN Error analysis Wireless networks Interference Extraterrestrial measurements Performance loss Automatic repeat request Delay Testing
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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