Title :
Guaranteed QoS for TCP flows in ATM-based DiffServ networks
Author_Institution :
Lab. of Commun., Tech. Univ. Dresden, Germany
Abstract :
We investigate the QoS which a single user observes in a DiffServ network which is based on ATM. We show that TCP flows can experience performance degradation compared to UDP flows, even if the network is well tuned. The reason for this behavior is the TCP congestion control mechanism. Individual TCP flows cannot benefit from guarantees provided by ATM on the aggregate level. We introduce a new scheme called fair queuing and selective marking (FQSM) which overcomes this problem. It is located at the network edges and requires no changes to an existing ATM network. Simulations show good performance and allow to give QoS guarantees for TCP connections
Keywords :
asynchronous transfer mode; packet switching; quality of service; queueing theory; telecommunication congestion control; telecommunication networks; transport protocols; ATM network; ATM-based DiffServ networks; FQSM; QoS guarantees; TCP congestion control; TCP connections; TCP flows; UDP flows; aggregate level; fair queuing and selective marking; performance degradation; simulations; Communication system traffic control; Communications technology; Diffserv networks; Intelligent networks; Internet; Protocols; Quality of service; TCPIP; Telecommunication traffic; Traffic control;
Conference_Titel :
Universal Multiservice Networks, 2000. ECUMN 2000. 1st European Conference on
Conference_Location :
Colmar
Print_ISBN :
0-7803-6419-8
DOI :
10.1109/ECUMN.2000.880737
