Title :
Sustaining TCP throughput using assured forwarding and ECN in a Differentiated Services network
Author :
Leung, Ivan Kai-Kin ; Muppala, Jogesh K.
Author_Institution :
Dept. of Comput. Sci., Hong Kong Univ. of Sci. & Technol., Kowloon, China
Abstract :
This paper examines the interaction among the congestion control mechanisms built into the Transmission Control Protocol (TCP), the Assured Forwarding (AF) PHB of Differentiated Services (DiffServ) mechanism, and Explicit Congestion Notification (ECN) mechanism. We show that ECN improves the fairness in sharing excess bandwidth among different AF flows. We then propose two mechanisms: (a) an out marking scheme, and (b) throughput sustaining scheme to foster cooperation between ECN and AF mechanisms to further improve the throughput of TCP sources. Our results show that the new schemes achieve significant improvement in the TCP throughput performance
Keywords :
Internet; bandwidth allocation; performance evaluation; quality of service; queueing theory; telecommunication traffic; transport protocols; AF PHB; AF flows; Assured Forwarding; DiffServ; Differentiated Services network; ECN; Explicit Congestion Notification; TCP; Transmission Control Protocol; congestion control; excess bandwidth sharing; fairness; out marking scheme; per-hop behavior; performance; throughput sustaining scheme; Aggregates; Bandwidth; Computer science; Diffserv networks; Harmonic analysis; Intelligent networks; Network topology; Quality of service; Throughput; Transport protocols;
Conference_Titel :
Performance, Computing, and Communications Conference, 2002. 21st IEEE International
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-7371-5
DOI :
10.1109/IPCCC.2002.995145
