An analysis of the impact of suspending cell discarding in TCP-over-ATM

Author

Nagata, Shunsaku ; Morita, Naotaka ; Noguchi, Hiroki ; Miyake, Kou

Author_Institution

NTT Network Service Syst. Labs., Tokyo, Japan

Volume

3

fYear

2000

fDate

26-30 Mar 2000

Firstpage

1147

Abstract

A cell-discard method has been developed for use in networks supporting TCP-over-ATM traffic with an unspecified bit rate. In this “concentrated cell discard” (CCD) method, when an ATM switch becomes congested, consecutive cells are discarded from the front of the buffer, and cell discarding is suspended for a specified period of time. This method prevents TCP timeouts, which are the main reason for the decreasing TCP throughput in today´s TCP-over-ATM networks, and shortens the duration of the congestion by avoiding the long delay experienced with the TCP fast-retransmission algorithm before the sender´s TCP receives duplicate acknowledgments. Even though CCD does not consider TCP packet size or boundaries, the throughput with CCD was found by computer simulation to actually be higher than with early packet discard

Keywords

Internet; asynchronous transfer mode; buffer storage; packet switching; telecommunication congestion control; telecommunication traffic; transport protocols; Internet; TCP fast-retransmission algorithm; TCP timeouts; TCP-over-ATM; buffer; cell discarding; cell-discard method; concentrated cell discard; congested ATM switch; consecutive cells; Asynchronous transfer mode; Bit rate; Charge coupled devices; Delay; Electronic mail; IP networks; Intelligent networks; Switches; Telecommunication traffic; Throughput;

fLanguage

English

Publisher

ieee

Conference_Titel

INFOCOM 2000. Nineteenth Annual Joint Conference of the IEEE Computer and Communications Societies. Proceedings. IEEE

Conference_Location

Tel Aviv

ISSN

0743-166X

Print_ISBN

0-7803-5880-5

Type

conf

DOI

10.1109/INFCOM.2000.832480

Filename

832480