TCP Friendly Rate Control (TFRC): Protocol Specification RFC3448bis

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Presentation transcript:

TCP Friendly Rate Control (TFRC): Protocol Specification RFC3448bis draft-ietf-dccp-rfc3448bis-05.txt S. Floyd, M. Handley, J. Padhye, and J. Widmer Testing and simulations from A. Sathiaseelan March 2008, DCCP Working Group

Changes from draft-ietf-dccp-rfc3448bis-03: Added text that the choice of b=1 is consistent with RFC3465bis. Feedback from Gorry. Typos and such reported by Arjuna. Updated terminology section, fixed typos and such. Feedback from Vladimir Moltchanov. Added a section to the Appendix about how one would add CWV-style behavior to TFRC for data-limited periods, if one wanted to. Feedback from Gorry. Added an implementation section about X_recv_set.

Changes from draft-ietf-dccp-rfc3448bis-04: Added a mechanism for decaying the value in X_recv_set following a loss event in a data-limited interval, and restricting recv_limit to "max (X_recv_set)" for the next RTT. Also added a discussion to Appendix C of the response to a loss during a data-limited period. Following feedback from Gorry and Arjuna.

Changes from draft-ietf-dccp-rfc3448bis-04: Protocol Response to a loss during a data-limited period ------------- ----------------------------------------------- Standard TCP: Set ssthresh, cwnd to FlightSize/2. TCP with CWV: Same as Standard TCP. Standard TFRC: Calculate X_Bps, send at most 2*X_recv. Revised TFRC: Calculate X_Bps, send at most recv_limit. In addition, modify X_recv_set. Table 4: Response to a loss during a data-limited period. (From Appendix C.4.)‏

Changes from draft-ietf-dccp-rfc3448bis-04: Removed a restriction in step 4) of Section 4.3 about checking if the sender was not data-limited, when the sender has been in initial slow-start. It is no longer needed. Feedback from Arjuna. Added pseudocode to Section 8.2.1 on "Determining If an Interval Was a Data-limited Interval", fixing a bug in the procedure. Feedback from Arjuna.

Changes since draft-ietf-dccp-rfc3448bis-05 (not yet submitted): Editing in response to AD review from Lars Eggert. Using normative language (MAY, SHOULD, REQUIRE, OPTIONAL, etc.), fixing a few nits.

Changes since draft-ietf-dccp-rfc3448bis-05 (not yet submitted): Added text about CCID-3 and CCID-4: “CCID-3 and CCID-4 implementations SHOULD use this document (rfc3448bis) instead of RFC 3448.” SHOULD or MAY, in the sentence above?

Changes since draft-ietf-dccp-rfc3448bis-05 (not yet submitted): Editing in response to feedback from Gerrit Renker. To be discussed on the mailing list.