A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Quick-Start for TCP and IP
Author(s) : A. Jain, et al.
Filename : draft-amit-quick-start-04.txt,.ps
Pages : 56
Date : 2005-2-22
This draft specifies an optional Quick-Start mechanism for transport
protocols, in cooperation with routers, to determine an allowed
sending rate at the start and at times in the middle of a data
transfer. While Quick-Start is designed to be used by a range of
transport protocols, in this document we describe its use with TCP.
By using Quick-Start, a TCP host, say, host A, would indicate its
desired sending rate in bytes per second, using a Quick Start
Request option in the IP header of a TCP packet. A Quick-Start
request for a higher sending rate would be sent in a TCP packet.
Each router along the path could, in turn, either approve the
requested rate, reduce the requested rate, or indicate that the
Quick-Start request is not approved. If the Quick-Start request is
not approved, then the sender would use the default congestion
control mechanisms. The Quick-Start mechanism can determine if
there are routers along the path that do not understand the Quick-
Start Request option, or have not agreed to the Quick-Start rate
request. TCP host B communicates the final rate request to TCP host
A in a transport-level Quick-Start Response in an answering TCP
packet. Quick-Start is designed to allow connections to use higher
sending rates when there is significant unused bandwidth along the
path, and all of the routers along the path support the Quick-Start
Request.
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