UBR+: improving performance of TCP over ATM-UBR service

Author

Goyal, Rohit ; Jain, Raj ; Kalyanaraman, Shivkumar ; Fahmy, Sonia ; Kim, Seong-Cheol

Author_Institution

Dept. of Comput. & Inf. Sci., Ohio State Univ., Columbus, OH, USA

Volume

2

fYear

1997

fDate

8-12 Jun 1997

Firstpage

1042

Abstract

ATM-UBR service responds to congestion by dropping cells when switch buffers become full. TCP connections running over UBR experience low throughput and high unfairness. For 100% TCP throughput, each switch needs buffers equal to the sum of the window sizes of all the TCP connections. Intelligent drop policies can improve the performance of TCP over UBR with limited buffers. The UBR+ service proposes enhancements to UBR for intelligent drop. The early packet discard scheme improves throughput but does not attempt to improve fairness. The selective packet drop scheme based on per-connection buffer occupancy improves fairness. The fair buffer allocation scheme further improves both throughput and fairness

Keywords

asynchronous transfer mode; buffer storage; local area networks; performance evaluation; telecommunication congestion control; transport protocols; wide area networks; ATM-UBR service; LAN; TCP connections; UBR+ service; WAN; cell dropping; congestion control; early packet discard scheme; fair buffer allocation scheme; fairness; intelligent drop policies; per-connection buffer occupancy; performance improvement; selective packet drop scheme; switch buffers; throughput; unspecified bit rate; Asynchronous transfer mode; Bandwidth; Bit rate; Feedback control; Information science; Measurement; Performance analysis; Protocols; Switches; Throughput;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 1997. ICC '97 Montreal, Towards the Knowledge Millennium. 1997 IEEE International Conference on

Conference_Location

Montreal, Que.

Print_ISBN

0-7803-3925-8

Type

conf

DOI

10.1109/ICC.1997.610038

Filename

610038