GLTRS--Glenn
TITLE AND SUBTITLE:
Adapting End Host Congestion Control for Mobility

AUTHOR(S):
Wesley M. Eddy and Yogesh P. Swami

REPORT DATE:
September 2005

FUNDING NUMBERS:
WBS-22-184-10-06
NAS3-03100

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
Verizon Federal Network Systems
21000 Brookpark Road
Cleveland, Ohio 44135

PERFORMING ORGANIZATION REPORT NUMBER:
E-15208

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Final Contractor Report

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA CR-2005-213838

SUPPLEMENTARY NOTES:
Wesley M. Eddy, Verizon Federal Network Systems, 21000 Brookpark Road, Cleveland, Ohio 44135; and Yogesh P. Swami, Nokia Research Center, 6000 Connection Drive, Irving, Texas 75603. Project Manager, Will Ivancic, Communications Division, NASA Glenn Research Center, organization code RCN, 216-433-3494.

ABSTRACT:
Network layer mobility allows transport protocols to maintain connection state, despite changes in a node's physical location and point of network connectivity. However, some congestion-controlled transport protocols are not designed to deal with these rapid and potentially significant path changes. In this paper we demonstrate several distinct problems that mobility-induced path changes can create for TCP performance. Our premise is that mobility events indicate path changes that require re-initialization of congestion control state at both connection end points. We present the application of this idea to TCP in the form of a simple solution (the Lightweight Mobility Detection and Response algorithm, that has been proposed in the IETF), and examine its effectiveness. In general, we find that the deficiencies presented are both relatively easily and painlessly fixed using this solution. We also find that this solution has the counter-intuitive property of being both more friendly to competing traffic, and simultaneously more aggressive in utilizing newly available capacity than unmodified TCP.

SUBJECT TERMS:
Computer networks

NUMBER OF PAGES:
18

PDF AVAILABLE FROM URL:
2005/CR-2005-213838.pdf ( 474 KB )
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