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Title : Non-Renegable Selective Acknowledgements (NR-SACKs) for SCTP
Author(s) : P. Natarajan, et al.
Filename : draft-natarajan-tsvwg-sctp-nrsack-01.txt
Pages : 21
Date : 2008-02-25
Stream Control Transmission Protocol (SCTP) [RFC4960] specifies
Selective Acknowledgements (SACKs) to allow a transport layer data
receiver to acknowledge DATA chunks which arrive out-of-order. In
SCTP, SACK information is advisory because the data receiver is
permitted to renege; that is, later discard a DATA chunk which
previously has been SACKed. Since delivery of a SACKed out-of-order
DATA chunk is not guaranteed, a copy of this DATA chunk MUST be kept
in the data sender's retransmission queue until this DATA chunk is
cumulatively acked.
This document specifies Non-Renegable Selective Acknowledgements (NR-
SACKs), an extension to SCTP's acknowledgment mechanism. NR-SACKs
enable a data receiver to explicitly acknowledge out-of-order DATA
chunks that have been delivered to the receiving application.
(Recall that, in SCTP, out-of-order data sometimes can be delivered.)
NR-SACKs also enable a data receiver to indicate any out-of-order
DATA chunks on which the receiver guarantees never to renege. As
opposed to SACKed DATA chunks, a sender can consider NR-SACKed DATA
chunks as never requiring retransmission, thus freeing space in the
data sender's retransmission queue sooner.
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